wms-20260930

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)


☒			QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2026


☐			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 001-36557

ADVANCED DRAINAGE SYSTEMS, INC.

(Exact name of registrant as specified in its charter)


Delaware			51-0105665
(State or Other Jurisdiction of Incorporation or Organization)			(I.R.S. Employer Identification No.)

4024 Green Stripe Lane, Hilliard, Ohio 43026

(Address of Principal Executive Offices, Including Zip Code)

(800) 733-7473

(Registrant’s Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.01 par value per share	WMS	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

Large Accelerated Filer

☒

Accelerated Filer

☐

Non-Accelerated Filer

☐

Smaller Reporting Company

☐

Emerging Growth Company

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of October 29, 2026, the registrant had 73,829,604 shares of common stock outstanding, which excludes 210,746 shares of unvested restricted common stock. The shares of common stock trade on the New York Stock Exchange under the ticker symbol “WMS.”

TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION

Item 1.

Financial Statements (Unaudited)

Page

Condensed Consolidated Balance Sheets as of September 30, 2026 and March 31, 2026

Condensed Consolidated Statements of Operations for the three and six months ended September 30, 2026 and 2025

Condensed Consolidated Statements of Comprehensive Income for the three and six months ended September 30, 2026 and 2025

Condensed Consolidated Statements of Cash Flows for the six months ended September 30, 2026 and 2025

Condensed Consolidated Statements of Stockholders’ Equity and Mezzanine Equity for the three and six months ended September 30, 2026 and 2025

Notes to the Condensed Consolidated Financial Statements

Item 2.

Management’s Discussion and Analysis of Financial Condition and Results of Operations

Item 3.

Quantitative and Qualitative Disclosures About Market Risk

Item 4.

Controls and Procedures

PART II. OTHER INFORMATION

Unregistered Sales of Equity Securities and Use of Proceeds

Item 3.

Defaults Upon Senior Securities

Item 4.

Mine Safety Disclosures

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Forward-Looking Statements

This Form 10-Q includes forward-looking statements. Some of the forward-looking statements can be identified by the use of terms such as “believes,” “expects,” “may,” “will,” “would,” “should,” “could,” “seeks,” “predict,” “potential,” “target,” “outlook,” “continue,” “intends,” “plans,” “projects,” “estimates,” “anticipates” or other comparable terms or the negative of those terms or similar expressions. These forward-looking statements include all matters that are not related to present facts or current conditions or that are not historical facts. They appear in a number of places throughout this Form 10-Q and include statements regarding our intentions, beliefs or current expectations concerning, among other things, our consolidated results of operations, financial condition, liquidity, prospects, growth strategies, and the industries in which we operate and include, without limitation, statements relating to our future performance.

Forward-looking statements are subject to known and unknown risks and uncertainties, many of which are beyond our control. We caution you that forward-looking statements are not guarantees of future performance and that our actual consolidated results of operations, financial condition, liquidity and industry development may differ materially from those made in or suggested by the forward-looking statements contained in this Form 10-Q. In addition, even if our actual consolidated results of operations, financial condition, liquidity and industry development are consistent with the forward-looking statements contained in this Form 10-Q, those results or developments may not be indicative of results or developments in subsequent periods. A number of important factors could cause actual results to differ materially from those contained in or implied by the forward-looking statements, including those reflected in forward-looking statements relating to our operations and business, the risks and uncertainties discussed in this Form 10-Q (including under the headings “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations”), and those described from time to time in our other filings with the SEC. Factors that could cause actual results to differ from those reflected in forward-looking statements relating to our operations and business include:

•fluctuations in the price and availability of resins and other raw materials, new tariff and international trade policies and our ability to pass any increased costs of raw materials and tariffs on to our customers in a timely manner;

•disruption or volatility in general business, political and economic conditions in the markets in which we operate;

•cyclicality and seasonality of the non-residential and residential construction markets and infrastructure spending;

•the risks of increasing competition in our existing and future markets;

•uncertainties surrounding the integration and realization of anticipated benefits of acquisitions or doing so within the intended timeframe, including our ability to successfully integrate National Diversified Sales (“NDS”) and/or StormTrap Investments LLC (“StormTrap”) into our business;

•risks that the acquisition of NDS and/or StormTrap may involve unexpected costs, liabilities, risks that the cost savings and synergies from the acquisition of NDS and/or StormTrap may not be fully realized;

•the effect of any claims, litigation, investigations or proceedings, including those described under “Part II - Item 1. Legal Proceedings” of this Form 10-Q;

•the effect of weather or seasonality;

•the loss of any of our significant customers;

•the risks of doing business internationally;

•the risks of conducting a portion of our operations through joint ventures;

•our ability to expand into new geographic or product markets;

•the risk associated with manufacturing processes;

•the effects of global climate change and any related regulatory responses;

•our ability to protect against cybersecurity incidents and disruptions or failures of our IT systems;

•our ability to assess and monitor the effects of artificial intelligence, machine learning, robotics and blockchain or other new approaches to data mining on our business and operations;

•our ability to manage our supply purchasing and customer credit policies;

•our ability to control labor costs and to attract, train and retain highly qualified employees and key personnel;

•our ability to protect our intellectual property rights;

•changes in laws and regulations, including environmental laws and regulations;

•our ability to appropriately address any environmental, social or governance concerns that may arise from our activities;

•the risks associated with our current levels of indebtedness, including borrowings under our existing credit agreement and outstanding indebtedness under our existing senior notes; and

•other risks and uncertainties, including those listed under “Part I - Item 1A. Risk Factors” in the Fiscal 2026 Form 10-K.

All forward-looking statements are made only as of the date of this report and we do not undertake any obligation, other than as may be required by law, to update or revise any forward-looking statements to reflect future events or developments. Comparisons of results for current and any prior periods are not intended to express any future trends, or indications of future performance, unless expressed as such, and should only be viewed as historical data.

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Table of Contents

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited) (Amounts in thousands, except par value)


	September 30, 2026		March 31, 2026
ASSETS
Current assets:
Cash	$	153,245	$	223,012
Receivables (less allowance for doubtful accounts of $4,657 and $4,654, respectively)	429,452		390,536
Inventories	563,775		543,381
Assets held for sale	11,415		43,451
Other current assets	36,689		30,449
Total current assets	1,194,576		1,230,829
Property, plant and equipment, net	1,248,456		1,217,165
Other assets:
Goodwill	1,041,156		1,042,716
Intangible assets, net	808,408		848,527
Other assets	170,887		166,386
Total assets	$	4,463,483	$	4,505,623
LIABILITIES, MEZZANINE EQUITY AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current maturities of debt obligations	$	7,955	$	5,865
Current maturities of finance lease obligations	40,517		38,136
Accounts payable	283,525		237,706
Liabilities held for sale	7,277		15,139
Other accrued liabilities	210,909		212,623
Accrued income taxes	11,853		—
Total current liabilities	562,036		509,469
Long-term debt obligations (less unamortized debt issuance costs of $16,951 and $18,428, respectively)	1,603,242		1,605,958
Long-term finance lease obligations	121,392		121,935
Deferred tax liabilities	230,852		220,994
Other liabilities	96,605		91,303
Total liabilities	$	2,614,127	$	2,549,659
Commitments and contingencies (see Note 13)
Mezzanine equity:
Redeemable common stock: $0.01 par value; 4,249 and 4,533 shares outstanding, respectively	69,045		73,652
Total mezzanine equity	69,045		73,652
Stockholders’ equity:
Common stock; $0.01 par value: 1,000,000 shares authorized; 85,923 and 85,319 shares issued, respectively; 70,456 and 72,654 shares outstanding, respectively	11,716		11,710
Paid-in capital	1,378,920		1,342,091
Common stock in treasury, at cost	(1,711,567)		(1,325,713)
Accumulated other comprehensive loss	(35,139)		(32,290)
Retained earnings	2,111,424		1,862,936
Total ADS stockholders’ equity	1,755,354		1,858,734
Noncontrolling interest in subsidiaries	24,957		23,578
Total stockholders’ equity	1,780,311		1,882,312
Total liabilities, mezzanine equity and stockholders’ equity	$	4,463,483	$	4,505,623

See accompanying Notes to Condensed Consolidated Financial Statements.

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Table of Contents

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited) (Amounts in thousands, except per share data)


	Three Months Ended September 30,				Six Months Ended September 30,
	2026		2025		2026		2025
Net sales	$	889,406	$	850,381	$	1,890,518	$	1,680,261
Cost of goods sold	543,551		510,249		1,136,616		1,009,691
Gross profit	345,855		340,132		753,902		670,570
Operating expenses:
Selling, general and administrative	129,617		119,224		260,435		223,185
Loss (gain) on disposal of assets and costs from exit and disposal activities	1,302		(15,926)		3,923		(8,902)
Intangible amortization	20,061		13,539		40,121		27,246
Income from operations	194,875		223,295		449,423		429,041
Other expense:
Interest expense	27,515		23,116		54,555		46,145
Interest income and other, net	(9,136)		(8,012)		(10,588)		(14,717)
Income before income taxes	176,496		208,191		405,456		397,613
Income tax expense	44,206		52,399		97,895		99,073
Equity in net income of unconsolidated affiliates	(1,333)		(708)		(2,630)		(2,051)
Net income from continuing operations	133,623		156,500		310,191		300,591
Net loss from discontinued operations, net of taxes	(23,522)		—		(29,175)		—
Net income	110,101		156,500		281,016		300,591
Less: net (loss) income attributable to noncontrolling interest	(338)		483		2,056		652
Net income attributable to ADS	$	110,439	$	156,017	$	278,960	$	299,939
Weighted average common shares outstanding:
Basic	75,367		77,752		75,943		77,697
Diluted	75,787		78,310		76,566		78,240
Net income from continuing operations per share available to common stockholders:
Basic	$	1.78	$	2.01	$	4.06	$	3.86
Diluted	$	1.77	$	1.99	$	4.02	$	3.83
Net loss from discontinued operations per share available to common stockholders:
Basic	$	(0.31)	$	—	$	(0.38)	$	—
Diluted	$	(0.31)	$	—	$	(0.38)	$	—
Net income per share available to common stockholders:
Basic	$	1.47	$	2.01	$	3.67	$	3.86
Diluted	$	1.46	$	1.99	$	3.64	$	3.83

See accompanying Notes to Condensed Consolidated Financial Statements.

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Table of Contents

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited) (Amounts in thousands)


	Three Months Ended September 30,				Six Months Ended September 30,
	2026		2025		2026		2025
Net income	$	110,101	$	156,500	$	281,016	$	300,591
Currency translation (loss) income	(2,457)		(1,119)		(2,546)		5,792
Comprehensive income	107,644		155,381		278,470		306,383
Less: other comprehensive (loss) income attributable to noncontrolling interest	(427)		526		303		1,862
Less: net (loss) income attributable to noncontrolling interest	(338)		483		2,056		652
Total comprehensive income attributable to ADS	$	108,409	$	154,372	$	276,111	$	303,869

See accompanying Notes to Condensed Consolidated Financial Statements.

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Table of Contents

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited) (Amounts in thousands)


	Six Months Ended September 30,
	2026		2025
Cash Flows from Operating Activities
Net income	$	281,016	$	300,591
Less: Net loss from discontinued operations, net of taxes	(29,175)		—
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	125,842		104,921
Deferred income taxes	9,376		15,226
Loss (gain) on disposal of assets and costs from exit and disposal activities	3,923		(8,902)
Stock-based compensation	24,531		16,981
Amortization of deferred financing charges	1,909		1,022
Inventory step up related to NDS acquisition	14,197		—
Fair market value adjustments to derivatives	(1,042)		(252)
Equity in net income of unconsolidated affiliates	(2,630)		(2,051)
Other operating activities	2,887		778
Changes in working capital:
Receivables	(35,545)		(62,649)
Inventories	(35,761)		69,516
Prepaid expenses and other current assets	(7,812)		(3,514)
Accounts payable, accrued expenses, and other liabilities	53,667		78,176
Operating cash flows from discontinued operations	(5,486)		—
Net cash provided by operating activities	458,247		509,843
Cash Flows from Investing Activities
Capital expenditures	(98,758)		(111,018)
Proceeds from disposal of assets	1,036		26,474
Acquisitions, net of cash acquired	—		(18,558)
Other investing activities	489		(2,241)
Net cash used in investing activities	(97,233)		(105,343)
Cash Flows from Financing Activities
Payments on syndicated Term Loan Facility	(1,500)		(3,500)
Payments on Equipment Financing	(603)		(1,885)
Payments on finance lease obligations	(19,052)		(17,171)
Repurchase of common stock	(372,916)		—
Cash dividends paid	(30,512)		(28,085)
Dividends paid to noncontrolling interest holder	(980)		—
Proceeds from exercise of stock options	3,426		1,482
Payment of withholding taxes on vesting of restricted stock units	(10,736)		(6,694)
Net cash used in financing activities	(432,873)		(55,853)
Effect of exchange rate changes on cash	(71)		1,017
Net change in cash	(71,930)		349,664
Cash and restricted cash at beginning of period	233,967		469,271
Cash and restricted cash at end of period	162,037		818,935
Less: cash held for sale	(8,660)		—
Cash and restricted cash, excluding held for sale, at end of period	$	153,377	$	818,935

RECONCILIATION TO BALANCE SHEET
Cash	$	153,245	$	812,862
Restricted cash (included in Other current assets in the Condensed Consolidated Balance Sheets)	132		6,073
Total cash and restricted cash	$	153,377	$	818,935

See accompanying Notes to Condensed Consolidated Financial Statements.

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Table of Contents

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY AND MEZZANINE EQUITY

(Unaudited) (Amounts in thousands)


	Common Stock			Paid-in Capital		Common Stock in Treasury			Accumulated Other Comprehensive Loss		Retained Earnings		Total ADS Stockholders’ Equity		Noncontrolling Interest in Subsidiaries		Total Stockholders’ Equity		Redeemable Common Stock			Total Mezzanine Equity
	Shares	Amount				Shares	Amount												Shares	Amount
Balance at July 1, 2025	84,247	$	11,700	$	1,294,545	11,942	$	(1,226,091)	$	(31,603)	$	1,622,535	$	1,671,086	$	19,205	$	1,690,291	5,415	$	87,985	$	87,985
Net income	—	—		—		—	—		—		156,017		156,017		483		156,500		—	—		—
Other comprehensive (loss) income	—	—		—		—	—		(1,645)		—		(1,645)		526		(1,119)		—	—		—
Common stock dividends ($0.18 per share)	—	—		—		—	—		—		(14,040)		(14,040)		—		(14,040)		—	—		—
KSOP redeemable common stock conversion	333	3		5,408		—	—		—		—		5,411		—		5,411		(333)	(5,411)		(5,411)
Exercise of common stock options	11	—		933		—	—		—		—		933		—		933		—	—		—
Restricted stock awards	11	—		—		—	(11)		—		—		(11)		—		(11)		—	—		—
Stock-based compensation expense	—	—		8,577		—	—		—		—		8,577		—		8,577		—	—		—
Other	—	—		(5)		—	—		—		—		(5)		—		(5)		—	—		—
Balance at September 30, 2025	84,602	$	11,703	$	1,309,458	11,942	$	(1,226,102)	$	(33,248)	$	1,764,512	$	1,826,323	$	20,214	$	1,846,537	5,082	$	82,574	$	82,574
Balance at April 1, 2025	83,750	$	11,694	$	1,277,694	11,886	$	(1,219,408)	$	(37,178)	$	1,492,634	$	1,525,436	$	17,700	$	1,543,136	5,702	$	92,652	$	92,652
Net income	—	—		—		—	—		—		299,939		299,939		652		300,591		—	—		—
Other comprehensive (loss) income	—	—		—		—	—		3,930		—		3,930		1,862		5,792		—	—		—
Common stock dividends ($0.36 per share)	—	—		—		—	—		—		(28,061)		(28,061)		—		(28,061)		—	—		—
KSOP redeemable common stock conversion	620	6		10,072		—	—		—		—		10,078		—		10,078		(620)	(10,078)		(10,078)
Exercise of common stock options	21	—		1,482		—	—		—		—		1,482		—		1,482		—	—		—
Restricted stock awards	95	1		—		28	(3,227)		—		—		(3,226)		—		(3,226)		—	—		—
Performance-based restricted stock units	83	1		—		28	(3,467)		—		—		(3,466)		—		(3,466)		—	—		—
Stock-based compensation expense	—	—		16,981		—	—		—		—		16,981		—		16,981		—	—		—
ESPP share issuance	33	1		3,235		—	—		—		—		3,236		—		3,236		—	—		—
Other	—	—		(6)		—	—		—		—		(6)		—		(6)		—	—		—
Balance at September 30, 2025	84,602	$	11,703	$	1,309,458	11,942	$	(1,226,102)	$	(33,248)	$	1,764,512	$	1,826,323	$	20,214	$	1,846,537	5,082	$	82,574	$	82,574

See accompanying Notes to Condensed Consolidated Financial Statements.

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Table of Contents

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY AND MEZZANINE EQUITY

(Unaudited) (Amounts in thousands)


	Common Stock			Paid-in Capital		Common Stock in Treasury			Accumulated Other Comprehensive Loss		Retained Earnings		Total ADS Stockholders’ Equity		Noncontrolling Interest in Subsidiaries		Total Stockholders’ Equity		Redeemable Common Stock			Total Mezzanine Equity
	Shares	Amount				Shares	Amount												Shares	Amount
Balance at July 1, 2026	85,702	$	11,714	$	1,361,911	14,382	$	(1,564,932)	$	(33,109)	$	2,016,109	$	1,791,693	$	26,702	$	1,818,395	4,422	$	71,848	$	71,848
Net income	—	—		—		—	—		—		110,439		110,439		(338)		110,101		—	—		—
Other comprehensive (loss) income	—	—		—		—	—		(2,030)		—		(2,030)		(427)		(2,457)		—	—		—
Common stock dividends ($0.20 per share)	—	—		—		—	—		—		(15,124)		(15,124)		—		(15,124)		—	—		—
Dividend to noncontrolling interest holder	—	—		—		—	—		—		—		—		(980)		(980)		—	—		—
Share repurchases	—	—		—		1,085	(146,627)		—		—		(146,627)		—		(146,627)		—	—		—
KSOP redeemable common stock conversion	173	2		2,801		—	—		—		—		2,803		—		2,803		(173)	(2,803)		(2,803)
Exercise of common stock options	32	—		2,951		—	—		—		—		2,951		—		2,951		—	—		—
Restricted stock awards	16	—		—		—	(8)		—		—		(8)		—		(8)		—	—		—
Stock-based compensation expense	—	—		11,257		—	—		—		—		11,257		—		11,257		—	—		—
Balance at September 30, 2026	85,923	$	11,716	$	1,378,920	15,467	$	(1,711,567)	$	(35,139)	$	2,111,424	$	1,755,354	$	24,957	$	1,780,311	4,249	$	69,045	$	69,045
Balance at April 1, 2026	85,319	$	11,710	$	1,342,091	12,665	$	(1,325,713)	$	(32,290)	$	1,862,936	$	1,858,734	$	23,578	$	1,882,312	4,533	$	73,652	$	73,652
Net income	—	—		—		—	—		—		278,960		278,960		2,056		281,016		—	—		—
Other comprehensive (loss) income	—	—		—		—	—		(2,849)		—		(2,849)		303		(2,546)		—	—		—
Common stock dividends ($0.40 per share)	—	—		—		—	—		—		(30,472)		(30,472)		—		(30,472)		—	—		—
Dividend to noncontrolling interest holder	—	—		—		—	—		—		—		—		(980)		(980)		—	—		—
Share repurchases	—	—		—		2,723	(375,118)		—		—		(375,118)		—		(375,118)		—	—		—
KSOP redeemable common stock conversion	284	3		4,604		—	—		—		—		4,607		—		4,607		(284)	(4,607)		(4,607)
Exercise of common stock options	37	—		3,426		—	—		—		—		3,426		—		3,426		—	—		—
Restricted stock awards	101	1		—		28	(3,744)		—		—		(3,743)		—		(3,743)		—	—		—
Performance-based restricted stock units	150	1		—		51	(6,992)		—		—		(6,991)		—		(6,991)		—	—		—
Stock-based compensation expense	—	—		24,531		—	—		—		—		24,531		—		24,531		—	—		—
ESPP share issuance	32	1		4,271		—	—		—		—		4,272		—		4,272		—	—		—
Other	—	—		(3)		—	—		—		—		(3)		—		(3)		—	—		—
Balance at September 30, 2026	85,923	$	11,716	$	1,378,920	15,467	$	(1,711,567)	$	(35,139)	$	2,111,424	$	1,755,354	$	24,957	$	1,780,311	4,249	$	69,045	$	69,045

See accompanying Notes to Condensed Consolidated Financial Statements.

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ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.BACKGROUND AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Description of Business - Advanced Drainage Systems, Inc., incorporated in Delaware, and its subsidiaries (collectively referred to as “ADS” or the “Company”) designs, manufactures and markets innovative water management solutions in the stormwater and onsite septic wastewater industries, providing superior drainage solutions for use in the construction and agriculture marketplace. ADS’s products are used across a broad range of end markets and applications, including non-residential, residential, infrastructure and agriculture applications.

The Company is managed and reports results of operations in two reportable segments: Stormwater and Wastewater.

Historically, sales of the Company’s products have been higher in the first and second quarters of each fiscal year due to favorable weather and longer daylight conditions accelerating construction activity during these periods. Seasonal variations in operating results may also be impacted by inclement weather conditions, such as cold or wet weather, which can delay projects.

Basis of Presentation - The Company prepares its Condensed Consolidated Financial Statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The Condensed Consolidated Balance Sheet as of March 31, 2026 was derived from audited financial statements included in the Annual Report on Form 10-K for the year ended March 31, 2026 (“Fiscal 2026 Form 10-K”). The accompanying unaudited Condensed Consolidated Financial Statements contain all adjustments, of a normal recurring nature, necessary to present fairly its financial position as of September 30, 2026, the results of operations for the three and six months ended September 30, 2026 and cash flows for the six months ended September 30, 2026. The interim Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements, including the notes thereto, filed in the Company’s Fiscal 2026 Form 10-K.

Presentation - Prior period segment results and related disclosures have been recast to conform to the current period segment presentation. See “Note 14. Business Segment Information” for additional information.

Principles of Consolidation - The Condensed Consolidated Financial Statements include the Company, its wholly-owned subsidiaries, its majority-owned subsidiaries and variable interest entities of which the Company is the primary beneficiary. The Company uses the equity method of accounting for equity investments where it exercises significant influence but does not hold a controlling financial interest. Such investments are recorded in Other assets in the Condensed Consolidated Balance Sheets and the related equity earnings from these investments are included in Equity in net income of unconsolidated affiliates in the Condensed Consolidated Statements of Operations. All intercompany balances and transactions have been eliminated in consolidation.

Recent Accounting Guidance

Recently Adopted Accounting Pronouncement

Measurement of Credit Losses for Accounts Receivable and Contract Assets - In July 2025, the FASB issued an accounting standards update (“ASU”) which amends Accounting Standards Codification (“ASC”) 326-20 to provide a practical expedient and an accounting policy election related to the estimation of expected credit losses for current accounts receivable and current contract assets that arise from transactions accounted for under ASC 606. An entity is required to disclose whether it has elected to use the practical expedient and, if so, whether it has also applied the accounting policy election. The Company adopted this pronouncement effective April 1, 2026 and elected to use the practical expedient. The Company’s adoption did not have a material impact on the Company’s Condensed Consolidated Financial Statements.

Except for the pronouncements described above, there have been no new accounting pronouncements issued or adopted since the filing of the Fiscal 2026 Form 10-K that have significance, or potential significance, to the Consolidated Financial Statements.

2.REVENUE RECOGNITION

Revenue Disaggregation - The Company disaggregates Stormwater net sales by Domestic and International and further disaggregates Domestic by product type. This disaggregation level best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The following table presents

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net sales (including intersegment net sales) disaggregated by product type for the Company’s Stormwater and Wastewater segments.


	Three Months Ended September 30,				Six Months Ended September 30,
(Amounts in thousands)	2026		2025		2026		2025
Stormwater
Domestic - Pipe	$	390,309	$	422,384	$	848,397	$	846,990
Domestic - Allied Products	276,511		198,970		579,898		386,476
International	56,277		58,657		115,744		107,148
Total Stormwater	723,097		680,011		1,544,039		1,340,614
Wastewater	197,575		196,368		406,495		391,330
Intersegment Eliminations	(31,266)		(25,998)		(60,016)		(51,683)
Consolidated Net Sales	$	889,406	$	850,381	$	1,890,518	$	1,680,261

Contract Balances - The Company recognizes a contract asset representing the Company’s right to recover products upon the receipt of returned products and a contract liability for the customer refund. The following table presents the balance of the Company’s contract asset and liability as of the periods presented:


(Amounts in thousands)	September 30, 2026		March 31, 2026
Contract asset - product returns	$	2,120	$	1,383
Refund liability	6,736		4,112

3.RESTRUCTURING AND LOSS (GAIN) ON DISPOSAL OF ASSETS AND COSTS FROM EXIT AND DISPOSAL ACTIVITIES

In fiscal 2026, the Company undertook certain restructuring and realignment activities (the “2026 Restructuring Plan”) to optimize the Company’s production, recycling and distribution network and to plan and implement go-to-market and operating model enhancements to scale for future growth, including the integration of NDS. Under the 2026 Restructuring Plan, for the three and six months ended September 30, 2026, the Company recorded expense of $3.9 million and $9.2 million, respectively, related to the optimization of the Company’s production, recycling and distribution networks, including the closure of four facilities and changes to the Company’s production footprint. For the three and six months ended September 30, 2025, the Company recorded expense of $7.2 million and $16.0 million, respectively, related to the closure of one of the Company’s recycling facilities to optimize its recycling network, one offsite storage location and one distribution yard. The Company does not currently have an estimate of additional costs or an expected end date for the restructuring actions. The following table summarizes the activities included in Restructuring and realignment expense during the periods presented.


	Three Months Ended September 30,				Six Months Ended September 30,
(Amounts in thousands)	2026		2025		2026		2025
Loss (gain) on disposal of assets and costs from exit and disposal activities:
Accelerated depreciation	$	—	$	—	$	—	$	1,764
Severance	400		(150)		2,545		1,854
Impairment of right-of-use assets	—		853		—		2,120
Other exit and disposal costs	254		1,015		271		1,806
Selling, general and administrative expenses:
Realignment expenses	3,223		5,453		6,397		8,422
Total 2026 Restructuring Plan activities	$	3,877	$	7,171	$	9,213	$	15,966

The costs incurred under the 2026 Restructuring Plan to date are classified as operating expenses and not allocated to a segment. During the six months ended September 30, 2026 and 2025, the Company recorded accelerated

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depreciation, severance costs, impairment of right-of-use lease assets and other exit and disposal costs. Other exit and disposal activities include legal and professional fees, inventory and equipment transfer costs and other costs.

The following table summarizes the restructuring liability for the periods presented:


(Amounts in thousands)	2026		2025
Accrual balance at April 1	$	1,201	$	—
Costs incurred	9,213		15,966
Non-cash charges	—		(3,884)
Expenses paid	(9,768)		(7,845)
Accrual balance at end of period	$	646	$	4,237

The restructuring liability is recorded in Other accrued liabilities in the Company’s Condensed Consolidated Balance Sheet.

(Gain) Loss on Disposal of Assets and Costs From Exit and Disposal Activities - The Company recorded $17.6 million and $16.4 million gain on disposal of assets in the three and six months ended September 30, 2025, respectively. The sale of properties previously held-for-sale resulted in the gain of $18.1 million. The remaining balance is due to the sale or disposal of other property, plant and equipment.

4.ACQUISITIONS

Acquisition of River Valley Pipe - On May 8, 2025, the Company completed its acquisition of the assets of River Valley Pipe LLC (“River Valley Pipe”), a privately-owned pipe manufacturing company located in the Midwest region of the United States. The preliminary fair value of consideration transferred was approximately $18.8 million. The acquisition was funded from cash on hand. River Valley Pipe is included in the Stormwater reportable segment. The purchase price allocation for assets acquired and liabilities assumed is complete and there were no changes to the valuations of assets acquired and liabilities assumed disclosed in the Fiscal 2026 Form 10-K.

Acquisition of NDS - On February 2, 2026, the Company completed the acquisition of the water management business of Norma Group SE, known as NDS. NDS expands the Company’s water management offering into complementary products through the addition of NDS’ residential water management, access box and irrigation solutions. The preliminary fair value of consideration transferred was approximately $972.5 million, which represented the purchase price of $984.9 million, net of cash acquired of $3.2 million and cash included in held for sale of $9.2 million. The preliminary purchase price excludes transaction costs. The acquisition was primarily funded from cash on hand. NDS is included in the Stormwater reportable segment.

Summary of Consideration Transferred - The Company has applied the acquisition method of accounting in accordance with ASC 805, Business Combinations (“ASC 805”) and recognized assets acquired and liabilities assumed at their fair value as of the date of acquisition, with the excess purchase consideration recorded to goodwill. The purchase price allocation for assets acquired and liabilities assumed is preliminary and will be finalized when valuations are complete and final assessments of the fair value of acquired assets and assumed liabilities are completed. As the Company finalizes the estimation of the fair value of the assets acquired and liabilities assumed, additional adjustments may be recorded during the measurement period (up to one year from the closing date).

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The following table summarizes consideration transferred and the preliminary purchase price allocation of identified assets acquired and liabilities assumed:


(Amounts in thousands)	Preliminary Amount		Valuation Adjustments		Updated Amount
Cash and cash equivalents	$	3,189	$	—	$	3,189
Accounts receivable	44,944		1,800		46,744
Inventory	93,092		(494)		92,598
Other current assets	1,359		—		1,359
Assets held for sale(a)	42,554		—		42,554
Property, plant and equipment	67,699		—		67,699
Goodwill	317,677		(1,378)		316,299
Intangible assets	456,920		—		456,920
Deferred tax assets	5,751		(488)		5,263
Other assets	17,212		—		17,212
Total assets acquired	1,050,397		(560)		1,049,837

Accounts payable	(10,664)		—		(10,664)
Accrued expenses	(29,285)		560		(28,725)
Liabilities held for sale(a)	(13,779)		—		(13,779)
Other liabilities	(11,788)		—		(11,788)
Total liabilities acquired	(65,516)		560		(64,956)
Total preliminary fair value of consideration transferred	$	984,881	$	—	$	984,881

(a)Upon acquisition, certain NDS entities met the held-for-sale criteria. The Company accordingly classified the associated assets acquired and liabilities assumed as held for sale.

The preliminary goodwill of $316.3 million represents the excess of consideration transferred over the preliminary fair value of assets acquired and liabilities assumed and is attributable to expected cross-selling and operating efficiencies. The goodwill is assigned to the Stormwater reportable segment and $271.7 million of the preliminary goodwill is deductible for income tax purposes.

Pro Forma Financial Information - The unaudited pro forma information for the three and six months ended September 30, 2025 presented below includes the effects of the NDS acquisition as if it had been consummated as of April 1, 2024, with adjustments to give effect to pro forma events that are directly attributable to the acquisition of NDS. Adjustments include those related to the depreciation and amortization of acquired fixed and intangible assets, transaction costs, inventory step-up and the estimated tax impacts thereof. The unaudited pro forma information does not reflect any operating efficiency or potential cost savings that could result from the consolidation of NDS. Accordingly, the unaudited pro forma information is presented for informational purposes only and is not necessarily indicative of the actual results of the combined company if the acquisition had occurred at the beginning of the period presented, nor is it indicative of the future results of operations.


(Amounts in thousands)	Three Months Ended September 30, 2025		Six Months Ended September 30, 2025
Net Sales	$	924,300	$	1,839,467
Net income attributable to ADS	168,442		320,266

During the three and six months ended September 30, 2026, the Company incurred $5.6 million and $8.8 million, respectively, of transaction and integration costs related to the acquisition such as legal, accounting, valuation and other professional services. These costs are included in selling, general and administrative expenses in the Consolidated Statements of Operations. These costs are deductible for income tax purposes.

Acquisition of StormTrap - On October 1, 2026, the Company entered into a definitive agreement to acquire StormTrap Investments LLC (“StormTrap”), an industry leader in large volume, space-constrained, highly engineered stormwater solutions for a purchase price of approximately $530 million. The acquisition will be funded

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by cash on hand and existing credit line capacity. The transaction is expected to close in the third quarter of fiscal 2027.

5.DISCONTINUED OPERATIONS AND ASSETS AND LIABILITIES HELD FOR SALE

The Company determined Teco S.r.l., Kimplas Piping Systems Private Limited, Kimplas Limited, Teco Irrigation USA, Inc. and Fish Water Products Sdn. Bhd. (collectively, the “NDS International Entities”) met the held for sale criteria upon acquisition. As a result, the assets and liabilities of the NDS International Entities have been classified as held for sale and are reported as assets held for sale and liabilities held for sale on the Consolidated Balance Sheet. The results of the NDS International Entities have been accounted for as discontinued operations and are reported as income or loss from discontinued operations, net of tax, on the Consolidated Statements of Operations. In addition to the NDS International Entities, one property is included as held for sale.

In July 2026, the Company completed the sale of Teco S.r.l. and Teco Irrigation USA. The sale resulted in a loss of $3.0 million included in discontinued operations, net of tax, for the six months ended September 30, 2026.

The Company measured the net assets of the disposal group at fair value less costs to sell. Costs to sell represent incremental direct costs expected to be incurred in connection with the disposal. Fair value was determined based on the valuation techniques noted in “Note 4. Acquisitions” in the Company’s Fiscal 2026 Form 10-K. In the three months ended September 30, 2026, the Company recorded a valuation allowance to adjust the assets to estimated fair value, less costs to sell, based on anticipated sale price. The Company anticipates selling the NDS International Entities in the third quarter of fiscal 2027.

The assets and liabilities classified as held for sale on the Company’s Consolidated Balance Sheet as of September 30, 2026 and March 31, 2026, include the following:


(Amounts in thousands)	September 30, 2026		March 31, 2026
Cash	$	8,660	$	9,184
Accounts receivable	5,430		6,957
Inventory	3,346		6,848
Other current assets	683		1,284
Property, plant and equipment	18,276		18,645
Other assets	334		533
Valuation allowance to adjust assets to estimated fair value, less costs to sell	(25,314)		—
Total assets held-for-sale	$	11,415	$	43,451

Current maturities of debt obligations	$	—	$	562
Accounts payable	2,262		2,776
Accrued expenses	2,431		8,669
Other liabilities	2,584		3,132
Total liabilities held-for-sale	$	7,277	$	15,139

The following table summarizes the major classes of items constituting the results from discontinued operations presented in the Condensed Consolidated Statement of Operations for the three and six months ended September 30, 2026:

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(Amounts in thousands)	Three Months Ended September 30, 2026		Six Months Ended September 30, 2026
Net sales	$	4,457	$	11,672
Cost of goods sold	4,216		10,197
Gross profit	241		1,475
Selling, general and administrative expenses	909		2,238
Loss from classification to held for sale	23,825		29,818
Income tax benefit	(971)		(1,406)
Net loss from discontinued operations	$	(23,522)	$	(29,175)

6.LEASES

Nature of the Company’s Leases - The Company has operating and finance leases for plants, yards, corporate offices, tractors, trailers and other equipment. The Company’s leases have remaining terms of less than one year to 10 years. A portion of the Company’s yard leases include an option to extend the leases for up to five years. The Company has included renewal options which are reasonably certain to be exercised in its right-of-use assets and lease liabilities.

7.INVENTORIES

Inventories as of the periods presented consisted of the following:


(Amounts in thousands)	September 30, 2026		March 31, 2026
Raw materials	$	124,072	$	108,856
Finished goods	439,703		434,525
Total inventories	$	563,775	$	543,381

8.RELATED PARTY TRANSACTIONS

ADS Mexicana - ADS conducts business in Mexico and Central America through its joint venture, ADS Mexicana, S.A. de C.V. (“ADS Mexicana”). ADS owns 51% of the outstanding stock of ADS Mexicana and consolidates ADS Mexicana for financial reporting purposes.

On June 6, 2022, the Company and ADS Mexicana amended the Intercompany Revolving Credit Promissory Note (the “Intercompany Note”) with a borrowing capacity of $9.5 million. The Intercompany Note matures on June 8, 2027. The Intercompany Note indemnifies the ADS Mexicana joint venture partner for 49% of any unpaid borrowings. The interest rates under the Intercompany Note are determined by certain base rates or Secured Overnight Financing Rate (“SOFR”) plus an applicable margin based on the Leverage Ratio. As of both September 30, 2026 and March 31, 2026, there were no borrowings outstanding under the Intercompany Note.

South American Joint Venture - The Tuberias Tigre - ADS Limitada joint venture (the “South American Joint Venture”) manufactures and sells HDPE corrugated pipe in certain South American markets. ADS owns 50% of the South American Joint Venture. ADS is the guarantor of 50% of the South American Joint Venture’s credit arrangement, and the debt guarantee is shared equally with the joint venture partner. The Company’s maximum potential obligation under this guarantee is $5.5 million as of September 30, 2026. The maximum borrowings permitted under the South American Joint Venture’s credit facility are $11.0 million. The Company does not anticipate any required contributions related to the balance of this credit arrangement. As of September 30, 2026 and March 31, 2026, there was no outstanding principal balance for the South American Joint Venture’s credit facility, including letters of credit.

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9.DEBT

Long-term debt as of the periods presented consisted of the following:


(Amounts in thousands)	September 30, 2026		March 31, 2026
Term Loan Facility	$	598,500	$	600,000
Senior Notes due 2030	500,000		500,000
Senior Notes due 2034	500,000		500,000
Revolving Credit Facility	—		—
Other debt	29,648		30,251
Total	1,628,148		1,630,251
Less: Unamortized debt issuance costs	(16,951)		(18,428)
Less: Current maturities	(7,955)		(5,865)
Long-term debt obligations	$	1,603,242	$	1,605,958

Senior Secured Credit Facility - In February 2026, the Company entered into a Fourth Amendment (the “Fourth Amendment”) to the Company's Base Credit Agreement with Barclays Bank PLC, as administrative agent under the Term Loan Facility and PNC Bank, National Association, as new administrative agent under the Revolving Credit Facility. Among other things, the Fourth Amendment (i) amended the Base Credit Agreement by increasing the Revolving Credit Facility (the “Amended Revolving Credit Facility”) from $600 million to $750 million (including an increase of the sub-limit for the swing-line sub-facility from $60 million to $75 million), (ii) refinanced the outstanding amounts owing under the Initial Term Loan Facility by providing for a new term loan facility in the initial aggregate principal amount of $600 million (the “Term Loan Facility”), (iii) extended the maturity date of the Revolving Credit Facility to February 27, 2031, (iv) extended the maturity date of the Term Loan Credit Facility to February 28, 2033, (v) revised the “applicable margin” to provide for a range of 125 basis points to 225 basis points (for Term Benchmark based loans) and 25 basis points to 125 basis points (for base rate loans), as determined based on the consolidated senior secured net leverage ratio ranging from less than 1.50 to 1.00 to greater than 3.50 to 1.00, (vi) provides for incremental facilities in an aggregate maximum amount of the greater of $350 million or 100% of consolidated EBITDA for the most recently ended four consecutive fiscal quarters, and (vii) amended certain covenant baskets under the Credit Agreement to align with growth of the Company. Letters of credit outstanding at September 30, 2026 and March 31, 2026 amounted to $11.4 million and $10.1 million, respectively, and reduced the availability of the Revolving Credit Facility.

Senior Notes due 2030 - On June 9, 2022, the Company issued $500.0 million aggregate principal amount of 6.375% Senior Notes due 2030 (the “2030 Notes”) pursuant to an Indenture, dated June 9, 2022 (the “2030 Indenture”), among the Company, the Guarantors and the Trustee.

Senior Notes due 2034 - On February 27, 2026, the Company issued $500.0 million aggregate principal amount of 5.375% Senior Notes due 2034 (the “2034 Notes”) pursuant to an Indenture, dated February 27, 2026 (the “2034 Indenture”), among the Company, the Guarantors and the Trustee.

Other debt - Other debt includes equipment financing and the commercial loan related to the Company’s headquarters. The assets under the Equipment Financing acquired are titled to the Company and included in Property, plant and equipment, net on the Company's Condensed Consolidated Balance Sheet. The equipment financing has an initial term of between 12 and 84 months, based on the life of the equipment, and bears a weighted average interest rate of 1.8% as of September 30, 2026. The current portion of the equipment financing is $1.1 million, and the long-term portion is $1.3 million at September 30, 2026.

The Company entered into a commercial loan agreement of $27.2 million which matures on December 5, 2028. The agreement bears interest based on SOFR plus a margin of 285 basis points, requires interest only payments through December 5, 2026, and beginning January 5, 2027 through maturity, includes principal and interest payments.

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Valuation of Debt - The carrying amounts of current financial assets and liabilities approximate fair value because of the immediate or short-term maturity of these items. The following table presents the carrying and fair value of the Company’s 2030 Notes, 2034 Notes and Equipment Financing for the periods presented:


	September 30, 2026				March 31, 2026
(Amounts in thousands)	Fair Value		Carrying Value		Fair Value		Carrying Value
Senior Notes due 2030	$	495,395	$	500,000	$	505,940	$	500,000
Senior Notes due 2034	462,150		500,000		489,230		500,000
Equipment Financing	2,364		2,448		2,961		3,056
Total fair value	$	959,909	$	1,002,448	$	998,131	$	1,003,056

The fair values of the 2030 Notes and 2034 Notes were determined based on quoted market data for the Company’s 2030 Notes and 2034 Notes, respectively. The fair value of the Equipment Financing was determined based on a comparison of the interest rate and terms of such borrowings to the rates and terms of similar debt available for the period. The categorization of the framework used to evaluate the 2030 Notes, 2034 Notes and Equipment Financing are considered Level 2. The Company believes the carrying amount of the remaining long-term debt, including the Term Loan Facility, Revolving Credit Facility and commercial loan agreement, is not materially different from its fair value as the interest rates and terms of the borrowings are similar to currently available borrowings.

10.STOCK-BASED COMPENSATION

ADS has several programs for stock-based payments to employees and non-employee members of its Board of Directors, including stock options, performance-based restricted stock units and restricted stock. The Company recognized stock-based compensation expense in the following line items of the Condensed Consolidated Statements of Operations for the periods presented:


	Three Months Ended September 30,				Six Months Ended September 30,
(Amounts in thousands)	2026		2025		2026		2025
Component of income before income taxes:
Cost of goods sold	$	2,109	$	1,914	$	4,250	$	3,570
Selling, general and administrative expenses	9,148		6,663		20,281		13,411
Total stock-based compensation expense	$	11,257	$	8,577	$	24,531	$	16,981

The following table summarizes stock-based compensation expense by award type for the periods presented:


	Three Months Ended September 30,				Six Months Ended September 30,
(Amounts in thousands)	2026		2025		2026		2025
Stock-based compensation expense:
Stock Options	$	1,786	$	1,673	$	3,647	$	3,463
Restricted Stock	3,403		3,204		6,777		6,299
Performance-based Restricted Stock Units	5,041		2,800		11,828		5,224
Employee Stock Purchase Plan	590		464		1,419		1,112
Non-Employee Directors	437		436		860		883
Total stock-based compensation expense	$	11,257	$	8,577	$	24,531	$	16,981

2017 Omnibus Incentive Plan - The 2017 Incentive Plan provides for the issuance of a maximum of 5.0 million shares of the Company’s common stock for awards made thereunder, which awards may consist of stock options, restricted stock, restricted stock units, stock appreciation rights, phantom stock, cash-based awards, performance awards (which may take the form of performance cash, performance units or performance shares) or other stock-based awards.

Restricted Stock - During the six months ended September 30, 2026, the Company granted 0.1 million shares of restricted stock with a grant date fair value of $13.8 million.

Performance-based Restricted Stock Units (“Performance Units”) - During the six months ended September 30, 2026, the Company granted 0.1 million shares of performance units at a grant date fair value of $16.7 million.

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Options - During the six months ended September 30, 2026, the Company granted 0.1 million nonqualified stock options under the 2017 Incentive Plan with a grant date fair value of $7.8 million. The Company estimates the fair value of stock options using a Black-Scholes option-pricing model. The following table summarizes the assumptions used to estimate the fair value of stock options during the period presented:


			Six Months Ended September 30, 2026
Common stock price			$138.09
Expected stock price volatility			43.0%
Risk-free interest rate			4.3%
Weighted-average expected option life (years)			6
Dividend yield			0.58%

Employee Stock Purchase Plan (“ESPP”) - In July 2022, the Company’s stockholders approved the Advanced Drainage Systems, Inc. Employee Stock Purchase Plan, which provides for a maximum of 0.4 million shares of the Company’s common stock. Eligible employees may purchase the Company's common stock at 85% of the lower of the fair market value of the Company's common stock on the first day or the last day of the offering period. The offering periods are six months in duration beginning either January 1 or July 1 and ending June 30 and December 31.

11.INCOME TAXES

The Company’s effective tax rate will vary based on a variety of factors, including overall profitability, the geographical mix of income before taxes and related tax rates in jurisdictions where it operates and other one-time charges, as well as the occurrence of discrete events. For the three months ended September 30, 2026 and 2025, the Company utilized an effective tax rate of 25.0% and 25.2%, respectively, to calculate its provision for income taxes from continuing operations. For the six months ended September 30, 2026 and 2025, the Company utilized an effective tax rate of 24.1% and 24.9%, respectively, to calculate its provision for income taxes from continuing operations. State and local income taxes increased the effective rate for the three and six months ended September 30, 2026 and 2025. Additionally, the discrete income tax benefit related to the change in valuation allowance on deferred tax assets for net losses on outside basis differences decreased the effective tax rate for the six months ended September 30, 2026.

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12.NET INCOME PER SHARE AND STOCKHOLDERS' EQUITY

Net Income per Share - The following table presents information necessary to calculate net income per share for the periods presented, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive:


	Three Months Ended September 30,				Six Months Ended September 30,
(Amounts in thousands, except per share data)	2026		2025		2026		2025
NET INCOME PER SHARE—BASIC:
Net income from continuing operations available to common stockholders	$	133,961	$	156,017	$	308,135	$	299,939
Net loss from discontinued operations, net of tax	(23,522)		—		(29,175)		—
Net income attributable to common stockholders	110,439		156,017		278,960		299,939
Weighted average number of common shares outstanding – Basic	75,367		77,752		75,943		77,697
Net income from continuing operations available to common stockholders per common share - Basic	$	1.78	$	2.01	$	4.06	$	3.86
Net loss from discontinued operations per common share - Basic	$	(0.31)	$	—	$	(0.38)	$	—
Net income per common share – Basic	$	1.47	$	2.01	$	3.67	$	3.86
NET INCOME PER SHARE—DILUTED:
Net income from continuing operations available to common stockholders	$	133,961	$	156,017	$	308,135	$	299,939
Net loss from discontinued operations, net of tax	(23,522)		—		(29,175)		—
Net income attributable to common stockholders	110,439		156,017		278,960		299,939
Weighted average number of common shares outstanding – Basic	75,367		77,752		75,943		77,697
Assumed restricted stock	41		43		57		39
Assumed exercise of stock options	370		440		556		415
Assumed performance-based restricted stock units	9		75		10		89
Weighted average number of common shares outstanding – Diluted	75,787		78,310		76,566		78,240
Net income from continuing operations available to common stockholders per common share - Diluted	$	1.77	$	1.99	$	4.02	$	3.83
Net loss from discontinued operations per common share - Diluted	$	(0.31)	$	—	$	(0.38)	$	—
Net income per common share – Diluted	$	1.46	$	1.99	$	3.64	$	3.83
Potentially dilutive securities excluded as anti-dilutive	61		50		60		53

Stockholders’ Equity – During the six months ended September 30, 2026, the Company repurchased 2.7 million shares of common stock at a cost of $375.1 million. The repurchases were made under the Board of Directors’ authorization in February 2026 to repurchase up to an additional $1.0 billion of ADS Common Stock in accordance with applicable securities laws. As of September 30, 2026, approximately $677.3 million of common stock may be repurchased under the authorization. The repurchase program does not obligate the Company to acquire any particular amount of common stock and may be suspended or terminated at any time at the Company’s discretion.

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13.COMMITMENTS AND CONTINGENCIES

Purchase Commitments - The Company has historically secured supplies of resin raw material by agreeing to purchase quantities during a future given period at a fixed price. These purchase contracts typically ranged from 1 to 12 months and occur in the ordinary course of business. The Company does not have any outstanding purchase commitments with fixed price and quantity as of September 30, 2026. The Company also enters into equipment purchase contracts with manufacturers.

Litigation and Other Proceedings - The Company is involved from time to time in various legal proceedings that arise in the ordinary course of business, including but not limited to commercial disputes, environmental matters, employee related claims, intellectual property disputes and litigation in connection with transactions including acquisitions and divestitures. The Company does not believe that such litigation, claims, and administrative proceedings will have a material adverse impact on the Company’s financial position or results of operations. The Company records a liability when a loss is considered probable, and the amount can be reasonably estimated.

14.BUSINESS SEGMENT INFORMATION

The Company operates its business in two distinct reportable segments: “Stormwater” and “Wastewater”, which are primarily organized based on products. The CODM for ADS is the Chief Executive Officer (“CEO”). The CEO reviews financial information and makes operational decisions based on Net sales and a measure of operating profit, Segment Adjusted EBITDA, a non-GAAP financial measure.

Certain selling and general and administrative expenses are not allocated to the segments, including non-operating functions such as legal, facilities management, and investor relations. A measure of assets is not applicable, as segment assets are not regularly reviewed by the CODM for evaluating performance or allocating resources. The Company does not aggregate operating segments to form reportable segments.

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The following table sets forth reportable segment information with respect to the amount of Net sales contributed by each class of similar products for the periods presented:


	Three Months Ended September 30, 2026
(Amounts in thousands)	Stormwater		Wastewater		Intersegment Eliminations		Total
Net sales:
Net sales from external customers	$	712,063	$	177,343	$	—	$	889,406
Intersegment net sales	11,034		20,232		(31,266)		—
Net sales	723,097		197,575		(31,266)		889,406

Significant segment expenses:
Cost of goods sold	471,745		100,644		(28,838)		543,551
Selling, general and administrative expenses	100,386		16,556		—		116,942
Other segment items(a)	(62,256)		(8,324)		—		(70,580)
Segment Adjusted EBITDA(b)	$	213,222	$	88,699	$	(2,428)

Corporate and other costs(c)							12,675
Total consolidated Adjusted EBITDA							$	286,818

Reconciliation of total reportable segment Adjusted EBITDA to income from continuing operations before income taxes:
Interest expense							27,515
Interest income							(1,407)
Depreciation and amortization							63,685
Stock-based compensation expense							11,257
Loss (gain) on disposal of assets and costs from exit and disposal activities							1,302
Transaction costs(d)							6,383
Other adjustments(e)							1,587
Income before income taxes							176,496

Income tax expense							44,206
Equity in net income of unconsolidated affiliates							(1,333)
Net income from continuing operations							$	133,623

(a)Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, restructuring and realignment expense, and transaction costs.

(b)The Company calculates Segment Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other gains and expenses.

(c)Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

(d)Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

(e)Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, restructuring and realignment expense, and executive retirement expense (benefit).

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	Three Months Ended September 30, 2025
(Amounts in thousands)	Stormwater		Wastewater		Intersegment Eliminations		Total
Net sales:
Net sales from external customers	$	670,665	$	179,716	$	—	$	850,381
Intersegment net sales	9,346		16,652		(25,998)		—
Net sales	680,011		196,368		(25,998)		850,381

Significant segment expenses:
Cost of goods sold	435,834		100,525		(26,110)		510,249
Selling, general and administrative expenses	88,979		18,861		—		107,840
Other segment items(a)	(55,420)		(11,204)		—		(66,624)
Segment Adjusted EBITDA(b)	$	210,618	$	88,186	$	112

Corporate and other costs(c)							11,384
Total consolidated Adjusted EBITDA							$	287,532

Reconciliation of total reportable segment Adjusted EBITDA to income from continuing operations before income taxes:
Interest expense							23,116
Interest income							(7,340)
Depreciation and amortization							54,693
Stock-based compensation expense							8,577
Loss (gain) on disposal of assets and costs from exit and disposal activities							(15,926)
Transaction costs(d)							9,317
Other adjustments(e)							6,904
Income before income taxes							208,191

Income tax expense							52,399
Equity in net income of unconsolidated affiliates							(708)
Net income from continuing operations							$	156,500

(a)Other segment items include depreciation, amortization recorded within cost of goods sold, stock-based compensation expense, inventory step-up costs, restructuring and realignment expense, and transaction costs.

(c)Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

(d)Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

(e)Includes derivative fair value adjustments, foreign currency transaction (gains) losses, legal settlements, inventory step-up costs, restructuring and realignment expense, and executive retirement expense (benefit).

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	Six Months Ended September 30, 2026
(Amounts in thousands)	Stormwater		Wastewater		Intersegment Eliminations		Total
Net sales:
Net sales from external customers	$	1,521,439	$	369,079	$	—	$	1,890,518
Intersegment net sales	22,600		37,416		(60,016)		—
Net sales	1,544,039		406,495		(60,016)		1,890,518

Significant segment expenses:
Cost of goods sold	990,557		205,244		(59,185)		1,136,616
Selling, general and administrative expenses	201,067		34,206		—		235,273
Other segment items(a)	(134,508)		(17,113)		—		(151,621)
Segment Adjusted EBITDA(b)	$	486,923	$	184,158	$	(831)

Corporate and other costs(c)							25,162
Total consolidated Adjusted EBITDA							$	645,088

Reconciliation of total reportable segment Adjusted EBITDA to income from continuing operations before income taxes:
Interest expense							54,555
Interest income							(2,698)
Depreciation and amortization							125,842
Stock-based compensation expense							24,531
Loss (gain) on disposal of assets and costs from exit and disposal activities							3,923
Transaction costs(d)							9,627
Inventory step up related to acquisition of NDS							14,197
Other adjustments(e)							9,655
Income before income taxes							405,456

Income tax expense							97,895
Equity in net income of unconsolidated affiliates							(2,630)
Net income from continuing operations							$	310,191

(c)Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

(d)Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

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	Six Months Ended September 30, 2025
(Amounts in thousands)	Stormwater		Wastewater		Intersegment Eliminations		Total
Net sales:
Net sales from external customers	$	1,322,192	$	358,069	$	—	$	1,680,261
Intersegment net sales	18,422		33,261		(51,683)		—
Net sales	1,340,614		391,330		(51,683)		1,680,261

Significant segment expenses:
Cost of goods sold	862,953		197,776		(51,038)		1,009,691
Selling, general and administrative expenses	162,761		37,205		—		199,966
Other segment items(a)	(99,213)		(19,101)		—		(118,314)
Segment Adjusted EBITDA(b)	$	414,113	$	175,450	$	(645)

Corporate and other costs(c)							23,219
Total consolidated Adjusted EBITDA							$	565,699

Reconciliation of total reportable segment Adjusted EBITDA to income from continuing operations before income taxes:
Interest expense							46,145
Interest income							(12,745)
Depreciation and amortization							104,921
Stock-based compensation expense							16,981
Loss (gain) on disposal of assets and costs from exit and disposal activities							(8,902)
Transaction costs(d)							10,124
Other adjustments(e)							11,562
Income before income taxes							397,613

Income tax expense							99,073
Equity in net income of unconsolidated affiliates							(2,051)
Net income from continuing operations							$	300,591

(c)Represents certain unallocated selling, general and administrative expenses required to reconcile segment Adjusted EBITDA to consolidated Adjusted EBITDA.

(d)Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

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The following table sets forth certain financial information attributable to the reportable segments for the periods presented:


	Three Months Ended September 30,				Six Months Ended September 30,
(Amounts in thousands)	2026		2025		2026		2025
Depreciation and Amortization
Stormwater	$	41,649	$	29,625	$	82,153	$	58,521
Wastewater	18,888		22,875		37,755		42,129
Other	3,148		2,193		5,934		4,271
Total	$	63,685	$	54,693	$	125,842	$	104,921
Capital Expenditures
Stormwater	$	35,792	$	38,541	$	78,296	$	79,143
Wastewater	4,865		11,994		19,221		17,729
Other	950		7,885		1,241		14,146
Total	$	41,607	$	58,420	$	98,758	$	111,018

15.SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION

Supplemental disclosures of cash flow information for the six months ended September 30, were as follows:


(Amounts in thousands)	2026		2025
Supplemental disclosures of cash flow information - cash paid:
Interest	$	52,243	$	42,765
Income taxes	43,845		55,650
Supplemental disclosures of noncash investing and financing activities:
Repurchase of common stock pending settlement	5,573		—
Share repurchase excise tax accrual	3,370		—
ESPP share issuance	4,272		3,236
Acquisition of property, plant and equipment under finance lease	21,360		33,145
Balance in accounts payable for the acquisition of property, plant and equipment	25,899		27,255

16.SUBSEQUENT EVENTS

Common Stock Dividend - Subsequent to the end of the quarter, the Company declared a quarterly cash dividend of $0.20 per share of common stock. The dividend is payable on December 15, 2026, to stockholders of record at the close of business on December 1, 2026.

Share Repurchase Program - Subsequent to the end of the quarter, 0.9 million shares of common stock at a cost of $114.1 million were repurchased under the Board of Directors’ authorization.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Unless the context otherwise indicates or requires, as used in this Quarterly Report on Form 10-Q (“Form 10-Q”), the terms “we,” “our,” “us,” “ADS” and the “Company” refer to Advanced Drainage Systems, Inc. and its directly- and indirectly-owned subsidiaries as a combined entity, except where it is clear that the terms mean only Advanced Drainage Systems, Inc. exclusive of its subsidiaries. We consolidate our joint ventures for purposes of GAAP, except for our South American Joint Venture.

Our fiscal year begins on April 1 and ends on March 31. Unless otherwise noted, references to “year” pertain to our fiscal year. For example, 2027 refers to fiscal 2027, which is the period from April 1, 2026 to March 31, 2027.

The following discussion and analysis of the financial condition and results of our operations should be read in conjunction with our Condensed Consolidated Financial Statements and related footnotes included elsewhere in this Form 10-Q and with the audited Consolidated Financial Statements included in our Fiscal 2026 Form 10-K, as filed with the Securities and Exchange Commission (the “SEC”) on May 21, 2026. In addition to historical condensed consolidated financial information, the following discussion contains forward-looking statements that reflect our plans, estimates and beliefs. Our actual results could differ materially from those discussed in the forward-looking statements. This discussion contains forward-looking statements that are based on the beliefs of our management, as well as assumptions made by, and information currently available to, our management. For more information, see the section entitled “Forward-Looking Statements.”

Overview

ADS is the leading manufacturer of innovative water management solutions in the stormwater and onsite septic wastewater industries, providing superior drainage solutions for use in the construction and agriculture marketplaces. Our innovative products, for which we hold many patents, are used across a broad range of end markets and applications, including non-residential, residential, infrastructure and agriculture applications. We have established a leading position in many of these end markets by leveraging our national sales and distribution platform, industry-acclaimed engineering support, overall product breadth and scale plus manufacturing excellence.

Executive Summary

Second Quarter Fiscal 2027 Results

•Net sales increased 4.6% to $889.4 million

•Net income from continuing operations decreased 14.6% to $133.6 million

•Adjusted EBITDA, a non-GAAP measure, decreased 0.2% to $286.8 million

Net sales increased $39.0 million, or 4.6%, to $889.4 million, as compared to $850.4 million in the prior year quarter. Stormwater sales increased $41.4 million, or 6.2%, to $712.1 million. Stormwater sales include $77.3 million of revenue from the acquisition of NDS. Wastewater sales decreased $2.4 million, or 1.3%, to $177.3 million.

Gross profit increased $5.7 million, or 1.7%, to $345.9 million as compared to $340.1 million in the prior year. The increase in gross profit is primarily driven by the acquisition of NDS.

Selling, general and administrative expenses increased $10.4 million, or 8.7%, to $129.6 million, as compared to $119.2 million. As a percentage of Net sales, Selling, general and administrative expenses increased to 14.6% as compared to 14.0% in the prior year. The increase was primarily driven by operating and integration expenses related to NDS.

Adjusted EBITDA, a non-GAAP measure, decreased $0.7 million, or 0.2%, to $286.8 million, as compared to $287.5 million in the prior year. As a percentage of Net sales, Adjusted EBITDA was 32.2% as compared to 33.8% in the prior year.

Year-to-date Fiscal 2027 Results

•Net sales increased 12.5% to $1,890.5 million

•Net income from continuing operations increased 3.2% to $310.2 million

•Net income from continuing operations per diluted share increased 5.0% to $4.02

•Adjusted EBITDA, a non-GAAP measure, increased 14.0% to $645.1 million

Net sales increased $210.3 million, or 12.5%, to $1,890.5 million, as compared to $1,680.3 million in the prior year. Stormwater sales increased $199.2 million, or 15.1%, to $1,521.4 million. Stormwater sales include $172.0 million of revenue from the acquisition of NDS. Wastewater sales increased $11.0 million, or 3.1%, to $369.1 million.

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Gross profit increased $83.3 million, or 12.4%, to $753.9 million as compared to $670.6 million in the prior year. The increase in gross profit is primarily driven by the acquisition of NDS.

Selling, general and administrative expenses increased $37.3 million, or 16.7%, to $260.4 million, as compared to $223.2 million. As a percentage of Net sales, Selling, general and administrative expenses increased to 13.8% as compared to 13.3% in the prior year. The increase was primarily driven by operating and integration expenses related to NDS.

Adjusted EBITDA, a non-GAAP measure, increased $79.4 million, or 14.0%, to $645.1 million, as compared to $565.7 million in the prior year. As a percentage of Net sales, Adjusted EBITDA was 34.1% as compared to 33.7% in the prior year.

Results of Operations

Comparison of the Three Months Ended September 30, 2026 to the Three Months Ended September 30, 2025

The following table summarizes our operating results as a percentage of Net sales that have been derived from our Condensed Consolidated Financial Statements for the periods presented. We believe this presentation is useful to investors in comparing historical results.


Consolidated Statements of Operations data:	For the Three Months Ended September 30,
(Amounts in thousands)	2026				2025
Net sales	$	889,406	100.0	%	$	850,381	100.0	%
Cost of goods sold	543,551		61.1		510,249		60.0
Gross profit	345,855		38.9		340,132		40.0
Selling, general and administrative expenses	129,617		14.6		119,224		14.0
Loss (gain) on disposal of assets and costs from exit and disposal activities	1,302		0.1		(15,926)		(1.9)
Intangible amortization	20,061		2.3		13,539		1.6
Income from operations	194,875		21.9		223,295		26.3
Interest expense	27,515		3.1		23,116		2.7
Interest income and other, net	(9,136)		(1.0)		(8,012)		(0.9)
Income before income taxes	176,496		19.8		208,191		24.5
Income tax expense	44,206		5.0		52,399		6.2
Equity in net income of unconsolidated affiliates	(1,333)		(0.1)		(708)		(0.1)
Net income from continuing operations	133,623		15.0		156,500		18.4
Net loss from discontinued operations	(23,522)		(2.6)		—		—
Net income	110,101		12.4		156,500		18.4
Less: net (loss) income attributable to noncontrolling interest	(338)		—		483		0.1
Net income attributable to ADS	$	110,439	12.4	%	$	156,017	18.3	%

Net sales - The following table presents Net sales to external customers by reportable segment for the three months ended September 30, 2026 and 2025.


(Amounts in thousands)	2026		2025		$ Variance		% Variance
Stormwater	$	712,063	$	670,665	$	41,398	6.2	%
Wastewater	177,343		179,716		(2,373)		(1.3)
Total Consolidated	$	889,406	$	850,381	$	39,025	4.6	%

Our consolidated Net sales for the three months ended September 30, 2026 increased by $39.0 million, or 4.6%, compared to the same period in fiscal 2026. The increase in Stormwater sales was primarily driven by NDS net sales of $77.3 million and an increase in price/mix in both Pipe and Allied Products, partially offset by a decrease in volume in both Pipe and Allied Products. The decrease in Wastewater sales was primarily driven by volume partially offset by an improvement in price/mix.

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Cost of goods sold and Gross profit - The following table presents gross profit by reportable segment for the three months ended September 30, 2026 and 2025.


(Amounts in thousands)	2026		2025		$ Variance		% Variance
Stormwater	$	251,352	$	244,177	$	7,175	2.9	%
Wastewater	96,931		95,843		1,088		1.1
Intersegment eliminations	(2,428)		112		(2,540)		(2,267.9)
Total gross profit	$	345,855	$	340,132	$	5,723	1.7	%

Our consolidated Cost of goods sold for the three months ended September 30, 2026 increased by $33.3 million, or 6.5%, and our consolidated Gross profit increased by $5.7 million, or 1.7%, compared to the same period in fiscal 2026. The increase in gross profit for Stormwater is primarily due to the acquisition of NDS, partially offset by higher material costs and higher transportation costs.

Selling, general and administrative expenses


	Three Months Ended September 30,
(Amounts in thousands)	2026			2025
Selling, general and administrative expenses	$	129,617		$	119,224
% of Net sales	14.6		%	14.0		%

Selling, general and administrative expenses for the three months ended September 30, 2026 increased $10.4 million from the same period in fiscal 2026 and as a percentage of Net sales, increased by 0.6%. The increase in Selling, general and administrative expenses was primarily due to the operating expenses and integration costs of NDS.

Loss (gain) on disposal of assets and costs from exit and disposal activities - The loss on disposal in fiscal 2027 was due to exit and disposal activities. The gain on disposal in fiscal 2026 was due to the sale of a property held-for-sale partially offset by exit and disposal activities. See “Note 3. Restructuring and Loss (Gain) on Disposal of Assets and Costs from Exit and Disposal Activities” for additional information.

Intangible amortization - Intangible amortization increased by $6.5 million primarily due to the increase in intangible assets due to the NDS acquisition.

Interest expense - Interest expense for the three months ended September 30, 2026 increased by $4.4 million from the same period in fiscal 2026. The increase was primarily due to increased debt levels.

Interest income and other, net - Interest income and other, net increased by $1.1 million for the three months ended September 30, 2026 compared to the same period in fiscal 2026. The increase was due to an increase in derivative fair value adjustments partially offset by a decrease in interest income due to decreased cash balances.

Income tax expense - The following table presents the effective tax rates for the periods presented:


	Three Months Ended September 30,
	2026		2025
Effective tax rate	25.0	%	25.2	%

See “Note 11. Income Taxes” for additional information.

Net loss from discontinued operations - The loss from discontinued operations was attributable to recording the NDS International entities classified as held for sale at fair value less cost to sell as of September 30, 2026.

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Comparison of the Six Months Ended September 30, 2026 to the Six Months Ended September 30, 2025


Consolidated Statements of Operations data:	For the Six Months Ended September 30,
(Amounts in thousands)	2026				2025
Net sales	$	1,890,518	100.0	%	$	1,680,261	100.0	%
Cost of goods sold	1,136,616		60.1		1,009,691		60.1
Gross profit	753,902		39.9		670,570		39.9
Selling, general and administrative expenses	260,435		13.8		223,185		13.3
Loss (gain) on disposal of assets and costs from exit and disposal activities	3,923		0.2		(8,902)		(0.5)
Intangible amortization	40,121		2.1		27,246		1.6
Income from operations	449,423		23.8		429,041		25.5
Interest expense	54,555		2.9		46,145		2.7
Interest income and other, net	(10,588)		(0.6)		(14,717)		(0.9)
Income before income taxes	405,456		21.4		397,613		23.7
Income tax expense	97,895		5.2		99,073		5.9
Equity in net income of unconsolidated affiliates	(2,630)		(0.1)		(2,051)		(0.1)
Net income from continuing operations	310,191		16.4		300,591		17.9
Net loss from discontinued operations, net of taxes	(29,175)		(1.5)		—		—
Net income	281,016		14.9		300,591		17.9
Less: net income attributable to noncontrolling interest	2,056		0.1		652		—
Net income attributable to ADS	$	278,960	14.8	%	$	299,939	17.9	%

Net sales - The following table presents Net sales to external customers by reportable segment for the six months ended September 30, 2026 and 2025.


(Amounts in thousands)	2026		2025		$ Variance		% Variance
Stormwater	$	1,521,439	$	1,322,192	$	199,247	15.1	%
Wastewater	369,079		358,069		11,010		3.1
Total Consolidated	$	1,890,518	$	1,680,261	$	210,257	12.5	%

Our consolidated Net sales for the six months ended September 30, 2026 increased by $210.3 million, or 12.5%, compared to the same period in fiscal 2026. The increase in Stormwater sales was primarily driven by NDS net sales of $172.0 million and an improvement in price/mix in both Pipe and Allied Products, partially offset by a decrease in volume. The increase in Wastewater sales was primarily driven by price/mix.

Cost of goods sold and Gross profit - The following table presents gross profit by reportable segment for the six months ended September 30, 2026 and 2025.


(Amounts in thousands)	2026		2025		$ Variance		% Variance
Stormwater	$	553,482	$	477,661	$	75,821	15.9	%
Wastewater	201,251		193,554		7,697		4.0
Intersegment eliminations	(831)		(645)		(186)		28.8
Total gross profit	$	753,902	$	670,570	$	83,332	12.4	%

Our consolidated Cost of goods sold for the six months ended September 30, 2026 increased by $126.9 million, or 12.6%, and our consolidated Gross profit increased by $83.3 million, or 12.4%, compared to the same period in fiscal 2026. The increase in gross profit for Stormwater is primarily due to the acquisition of NDS, favorable price/cost and manufacturing costs, partially offset by higher material and higher transportation costs. The increase in gross profit for Wastewater was driven by improved price/cost.

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Selling, general and administrative expenses


	Six Months Ended September 30,
(Amounts in thousands)	2026			2025
Selling, general and administrative expenses	$	260,435		$	223,185
% of Net sales	13.8		%	13.3		%

Selling, general and administrative expenses for the six months ended September 30, 2026 increased $37.3 million from the same period in fiscal 2026 and as a percentage of Net sales, increased by 0.5%. The increase in Selling, general and administrative expenses was due to operating expenses and integration expenses for NDS and increased stock-based compensation due to performance.

Loss (gain) on disposal of assets and costs from exit and disposal activities - The loss on disposal in fiscal 2027 was due to exit and disposal activities. The gain on disposal in fiscal 2026 was due to the sale of properties held-for-sale partially offset by exit and disposal activities. See “Note 3. Restructuring and Loss (Gain) on Disposal of Assets and Costs from Exit and Disposal Activities” for additional information.

Intangible amortization - Intangible amortization increased by $12.9 million primarily due to the increase in intangible assets due to the NDS acquisition.

Interest expense - Interest expense for the six months ended September 30, 2026 increased by $8.4 million from the same period in fiscal 2026. The increase was primarily due to increased debt levels.

Interest income and other, net - Interest income and other, net decreased by $4.1 million for the six months ended September 30, 2026 compared to the same period in fiscal 2026. The decrease was primarily due to decreased cash balances.

Income tax expense - The following table presents the effective tax rates for the six months ended September 30, 2026 and 2025.


	Six Months Ended September 30,
	2026		2025
Effective tax rate	24.1	%	24.9	%

The change in the effective tax rate for the six months ended September 30, 2026 was primarily driven by a discrete income tax benefit for the change in valuation allowance on deferred tax assets for net losses on outside basis differences. See “Note 11. Income Taxes” for additional information.

Adjusted EBITDA and Adjusted EBITDA Margin - Adjusted EBITDA and Adjusted EBITDA Margin, which are non-GAAP financial measures, have been presented in this Form 10-Q as supplemental measures of financial performance that are not required by, or presented in accordance with GAAP and should not be considered as alternatives to net income as measures of financial performance or cash flows from operations or any other performance measure derived in accordance with GAAP. We calculate Adjusted EBITDA as net income from continuing operations before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other expenses. We calculate Adjusted EBITDA Margin as Adjusted EBITDA divided by Net sales.

Adjusted EBITDA and Adjusted EBITDA Margin are included in this Form 10-Q because they are key metrics used by management and our board of directors to assess our consolidated financial performance. These non-GAAP financial measures are frequently used by analysts, investors and other interested parties to evaluate companies in our industry. In addition to covenant compliance and executive performance evaluations, we use these non-GAAP financial measures to supplement GAAP measures of performance to evaluate the effectiveness of our consolidated business strategies, to make budgeting decisions and to compare our performance against that of other peer companies using similar measures. We use Adjusted EBITDA Margin to evaluate our ability to generate profitable sales.

Adjusted EBITDA and Adjusted EBITDA Margin contain certain other limitations, including the failure to reflect our cash expenditures, cash requirements for working capital needs, cash expenditures to replace assets being depreciated and amortized and interest expense, or the cash requirements necessary to service interest on principal payments on our indebtedness. In evaluating Adjusted EBITDA and Adjusted EBITDA Margin, you should be aware that in the future we will incur expenses that are the same as or similar to some of the adjustments in this presentation, such as stock-based

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compensation expense, derivative fair value adjustments, and foreign currency transaction losses. Management compensates for these limitations by relying on our GAAP results and using non-GAAP measures on a supplemental basis.

The following table presents a reconciliation of Adjusted EBITDA to Net income, the most comparable GAAP measure, for each of the periods presented.


	Three Months Ended September 30,						Six Months Ended September 30,
(Amounts in thousands)	2026			2025			2026			2025
Net income from continuing operations	$	133,623		$	156,500		$	310,191		$	300,591
Depreciation and amortization	63,685			54,693			125,842			104,921
Interest expense	27,515			23,116			54,555			46,145
Income tax expense	44,206			52,399			97,895			99,073
EBITDA	269,029			286,708			588,483			550,730
Restructuring and realignment expense(a)	3,877			7,171			9,213			15,966
Loss (gain) on disposal of assets	649			(17,644)			1,108			(16,446)
Stock-based compensation expense	11,257			8,577			24,531			16,981
Transaction costs(b)	6,383			9,317			9,627			10,124
Inventory step up related to acquisition of NDS	—			—			14,197			—
Interest income	(1,407)			(7,340)			(2,698)			(12,745)
Other adjustments(c)	(2,970)			743			627			1,089
Adjusted EBITDA	$	286,818		$	287,532		$	645,088		$	565,699
Adjusted EBITDA Margin	32.2		%	33.8		%	34.1		%	33.7		%

(a)Includes costs associated with closure of facilities, as well as professional fees incurred in connection with supporting enterprise-wide restructuring and realignment initiatives. Excludes gain on sale of properties previously held-for-sale and equipment. See “Note 3. Restructuring and Loss (Gain) on Disposal of Assets and Costs from Exit and Disposal Activities” for additional information.

(b)Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

(c)Includes derivative fair value adjustments, foreign currency transaction (gains) losses, the proportionate share of interest, income taxes, depreciation and amortization related to the South American Joint Venture, which is accounted for under the equity method of accounting and executive retirement expense.

Liquidity and Capital Resources

Historically, we have funded our operations through internally generated cash flow supplemented by debt financings, equity issuance and finance and operating leases. These sources have been sufficient historically to fund our primary liquidity requirements, including working capital, capital expenditures, debt service and dividend payments for our common stock. From time to time, we may explore additional financing methods and other means to raise capital. There can be no assurance that any additional financing will be available to us on acceptable terms or at all.

Free Cash Flow - Free cash flow is a non-GAAP financial measure that comprises cash flow from operations less capital expenditures and is used by management and our Board of Directors to assess our ability to generate cash. Accordingly, free cash flow has been presented as a supplemental measure of liquidity that is not required by, or presented in accordance with GAAP, because management believes that free cash flow provides useful information to investors and others in understanding and evaluating our ability to generate cash flow from operations after capital expenditures. Free cash flow is not a GAAP measure of our liquidity and should not be considered as an alternative to cash flow from operating activities as a measure of liquidity or any other liquidity measure derived in accordance with GAAP. Our measure of free cash flow is not necessarily comparable to other similarly titled captions of other companies due to different methods of calculation.

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The following table presents a reconciliation of free cash flow to cash provided by operating activities, the most comparable GAAP measure, for each of the periods presented:


	Six Months Ended September 30,
(Amounts in thousands)	2026		2025
Net cash provided by operating activities	$	458,247	$	509,843
Capital expenditures	(98,758)		(111,018)
Free Cash Flow	$	359,489	$	398,825

The following table presents key liquidity metrics utilized by management including the leverage ratio which is calculated as net debt divided by the trailing twelve months Adjusted EBITDA:


(Amounts in thousands)	September 30, 2026
Total debt (debt and finance lease obligations)	$	1,773,106
Cash	153,245
Net debt (total debt less cash)	1,619,861
Leverage Ratio	1.6

The following table summarizes our available liquidity for the period presented:


(Amounts in thousands)	September 30, 2026
Revolver capacity	$	750,000
Less: outstanding borrowings	—
Less: letters of credit	(11,365)
Revolver available liquidity	$	738,635

As of September 30, 2026, we had $22.2 million in cash that was held by our foreign subsidiaries, including $12.7 million held by our Canadian subsidiaries. We continue to evaluate our strategy regarding foreign cash, but our earnings in foreign subsidiaries still remain indefinitely reinvested, except for Canada. We plan to repatriate earnings from Canada and believe that there will be no additional tax costs associated with the repatriation of such earnings other than any potential non-U.S. withholding taxes.

Working Capital and Cash Flows

As of September 30, 2026, we had $891.8 million in liquidity, including $153.2 million of cash and $738.6 million in borrowings available under our Revolving Credit Agreement, net of outstanding letters of credit. We believe that our cash on hand, together with the availability of borrowings under our Credit Agreement and other financing arrangements and cash generated from operations, will be sufficient to meet our working capital requirements, anticipated capital expenditures, and scheduled principal and interest payments on our indebtedness for at least the next twelve months.

Working Capital - Working capital decreased to $632.5 million as of September 30, 2026, from $721.4 million as of March 31, 2026. The decrease in working capital is primarily due to decreased cash on hand and increased accounts payable offset by increased accounts receivable and inventory due to seasonality.


	Six Months Ended September 30,
(Amounts in thousands)	2026		2025
Net cash provided by operating activities	$	458,247	$	509,843
Net cash used in investing activities	(97,233)		(105,343)
Net cash used in financing activities	(432,873)		(55,853)

Operating Cash Flows - Cash flows from operating activities decreased $51.6 million during the six months ended September 30, 2026 primarily driven by changes in working capital.

Investing Cash Flows - Cash flows used in investing activities during the six months ended September 30, 2026 decreased by $8.1 million compared to the same period in fiscal 2026. The decrease in cash used in investing activities was due to the prior period acquisition of River Valley Pipe and decreased capital expenditures offset by the prior period proceeds from the sale of properties held-for-sale.

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Capital expenditures totaled $98.8 million and $111.0 million for the six months ended September 30, 2026 and 2025, respectively. Our capital expenditures for the six months ended September 30, 2026 were used primarily to support facility expansions, equipment replacements and technology improvement initiatives. We also acquired $21.4 million of property, plant and equipment under finance leases, which includes material handling transportation equipment to update our fleet of forklifts, trucks and trailers.

We currently anticipate that we will make capital expenditures of approximately $200 million in fiscal year 2027, including approximately $80 million of open orders as of September 30, 2026. Such capital expenditures are expected to be financed using funds generated by operations.

Financing Cash Flows - During the six months ended September 30, 2026, cash used in financing activities included the repurchase of common stock of $372.9 million, $30.5 million of dividend payments, $19.1 million of payments of finance lease obligations and $10.7 million for shares withheld for tax purposes.

During the six months ended September 30, 2025, cash used in financing activities included $28.1 million of dividend payments, $17.2 million of payments of finance lease obligations and $6.7 million for shares withheld for tax purposes.

Financing Transactions - There have been no changes in our debt disclosures from those disclosed in “Liquidity and Capital Resources” in our Fiscal 2026 Form 10-K. We are in compliance with our debt covenants as of September 30, 2026.

Off-Balance Sheet Arrangements

Excluding the guarantees of 50% of certain debt of our unconsolidated South American Joint Venture as further discussed in “Note 8. Related Party Transactions” to the Condensed Consolidated Financial Statements, we do not have any other off-balance sheet arrangements. As of September 30, 2026, our South American Joint Venture had no outstanding debt subject to our guarantees. We do not believe that this guarantee will have a current or future effect on our financial condition, results of operations, liquidity or capital resources.

Critical Accounting Policies and Estimates

There have been no changes in critical accounting policies from those disclosed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Fiscal 2026 Form 10-K, except as disclosed in “Note 1. Background and Summary of Significant Accounting Policies.”

Item 3. Quantitative and Qualitative Disclosures about Market Risk

We are subject to various market risks, primarily related to changes in interest rates, credit, raw material supply prices and, to a lesser extent, foreign currency exchange rates. Our financial position, results of operations or cash flows may be negatively impacted in the event of adverse movements in the respective market rates or prices in each of these risk categories. Our exposure in each category is limited to those risks that arise in the normal course of business, as we do not engage in speculative, non-operating transactions. Our exposure to market risk has not materially changed from what we previously disclosed in Part II. Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” of our Fiscal 2026 Form 10-K except as disclosed below.

Interest Rate Risk - We are subject to interest rate risk associated with our bank debt. A 1.0% increase in interest rates on our variable-rate debt would increase our annual forecasted interest expense by approximately $5.9 million based on our borrowings as of September 30, 2026. Assuming the Revolving Credit Facility is fully drawn, each 1.0% increase or decrease in the applicable interest rate would change our interest expense by approximately $12.4 million, for the twelve months ended September 30, 2026.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures - The Company’s CEO and Chief Financial Officer (“CFO”) are responsible for evaluating the effectiveness of our disclosure controls and procedures as defined in the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Rules 13a-15(e) and 15d-15(e). The Company’s disclosure controls and procedures are designed to provide reasonable assurance that the information required to be disclosed in the Company’s reports under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to management, including the Company’s CEO and CFO, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

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Based on the evaluation of our disclosure controls and procedures, our CEO and CFO concluded that the Company’s disclosure controls and procedures were effective as of the end of the period covered by this report.

Changes in Internal Control over Financial Reporting - There were no changes in the Company’s internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act that occurred during the three months ended September 30, 2026 that has materially affected, or is reasonably likely to materially affect, internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

The Company is involved from time to time in various legal proceedings that arise in the ordinary course of business, including but not limited to commercial disputes, environmental matters, employee related claims, intellectual property disputes and litigation in connection with transactions including acquisitions and divestitures. The Company does not believe that such litigation, claims, and administrative proceedings will have a material adverse impact on the Company’s financial position or results of operations.

Please see “Note 13. Commitments and Contingencies,” of the Condensed Consolidated Financial Statements of this Form 10-Q for more information regarding legal proceedings.

Item 1A. Risk Factors

The risk factors below reflect risks related to the proposed acquisition of StormTrap. Additional important risk factors that could affect our operations and financial performance, or that could cause results or events to differ from current expectations, are described in “Part I, Item 1A — Risk Factors” of our Fiscal 2026 Form 10-K. These factors are further supplemented by those discussed in “Part II, Item 7A — Quantitative and Qualitative Disclosures about Market Risk” of our Fiscal 2026 Form 10-K and in “Part I, Item 3 — Quantitative and Qualitative Disclosures about Market Risk” and “Part II, Item 1 — Legal Proceedings” of this Quarterly Report on Form 10-Q.

The acquisition of StormTrap may not be completed on the anticipated terms, within the anticipated timeframe, or at all.

The completion of our proposed acquisition of StormTrap is subject to customary closing conditions and other risks and uncertainties. There can be no assurance that all required closing conditions will be satisfied or waived, that the acquisition will be completed within the anticipated timeframe, or that the acquisition will be completed at all.

If the acquisition is delayed or not completed, we may not realize the anticipated strategic, operational or financial benefits of the transaction. In addition, we may incur significant transaction-related costs regardless of whether the acquisition is completed, and management may be required to devote substantial time and resources to transaction-related matters. Any delay in completing, or failure to complete, the acquisition could adversely affect our business, financial condition, results of operations and cash flows.

We may be unable to successfully integrate StormTrap, if the acquisition is completed, in order to realize the anticipated benefits of the transaction or do so within the anticipated timeframe.

If the acquisition of StormTrap is completed, we expect to devote significant management attention and resources to integrating StormTrap’s business and operations with our Company. We may be unable to realize the planned synergies from the proposed StormTrap acquisition or other anticipated benefits in the timeframe that we expect or at all. We continue to assess synergies that may be realized from the transaction, the achievement of which will depend on a number of factors.

If completed, the success of the proposed StormTrap acquisition, including anticipated synergies, benefits and cost savings, will depend in part on our ability to successfully combine and integrate our operations with the StormTrap business. If we experience difficulties with the integration process or incur unforeseen costs, the anticipated benefits and cost savings of the transaction may not be realized fully or at all, or may take longer to realize than expected. Integration efforts may result in significant costs and divert management attention and resources. These matters could adversely affect our business and financial results for an extended period following the completion of such transaction. In addition, actual cost savings may be less than anticipated or otherwise offset by other factors.

Uncertainties associated with the integration of the proposed acquisition of StormTrap may result in the loss of management personnel and other key employees, which could adversely affect our business, operations and financial results.

The integration of the proposed acquisition of StormTrap, if completed, may disrupt our business and the businesses of StormTrap. We depend on the experience, industry knowledge and expertise of senior management and other key employees to execute our business strategy. The unanticipated departure of members of management or other key personnel, whether from our Company or, if completed, StormTrap, could adversely affect our operations and growth initiatives.

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In addition, current and prospective employees may experience uncertainty regarding their future roles and responsibilities, which could adversely affect our ability to attract and retain key personnel. Accordingly, no assurance can be given that we will be able to retain key management personnel and employees or continue to attract qualified personnel at historical levels. Competition for experienced management, engineering, technical, marketing and support personnel remains intense, and we may be unable to attract or retain such personnel.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

In February 2026, we announced that our Board of Directors approved a new $1.0 billion stock repurchase authorization (the “Repurchase Program”) of ADS common stock in accordance with applicable securities laws. During the three months ended September 30, 2026, the Company repurchased 1.1 million shares of common stock at a cost of $145.3 million. As of September 30, 2026, approximately $677.3 million of common stock may be repurchased under the authorization. The stock repurchase program does not obligate us to acquire any particular amount of common stock and may be suspended or terminated at any time at our discretion.

The following table provides information with respect to repurchases of our common stock by us and our “affiliated purchasers” (as defined by Rule 10b-18(a)(3) under the Exchange Act) during the three months ended September 30, 2026.


Period	Total Number of Shares Purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plan
	(amounts in thousands, except per share data)
July 1, 2026 to July 31, 2026	418	$	142.22	418	$	763,160
August 1, 2026 to August 31, 2026	—	—		—	763,160
September 1, 2026 to September 30, 2026	667	128.66		667	677,295
Total	1,085	$	133.87	1,085	$	677,295

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

During the three months ended September 30, 2026, no director or officer of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as such terms are defined in Item 408(a) of Regulation S-K.

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Item 6.			Exhibits

The following exhibits are filed herewith or incorporated herein by reference.


Exhibit Number						Exhibit Description

2.1						Securities Purchase Agreement between StormTrap Investors, L.L.C., as representative of the Sellers, the Sellers, ADS Investment LLC and Advanced Drainage Systems, Inc. (incorporated by reference to Exhibit 2.1 to our Current Report on Form 8-K filed on October 5, 2026).
31.1*						Certification of President and Chief Executive Officer of Advanced Drainage Systems, Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*						Certification of Executive Vice President and Chief Financial Officer of Advanced Drainage Systems, Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*						Certification of Principal Executive Officer of Advanced Drainage Systems, Inc. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2*						Certification of Principal Financial Officer of Advanced Drainage Systems, Inc. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*						Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH*						Inline XBRL Taxonomy Extension Schema.
101.CAL*						Inline XBRL Taxonomy Extension Calculation Linkbase.
101.DEF*						Inline XBRL Taxonomy Extension Definition Linkbase.
101.LAB*						Inline XBRL Taxonomy Extension Label Linkbase.
101.PRE*						Inline XBRL Taxonomy Extension Presentation Linkbase.
104						The cover page for the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2026, has been formatted in Inline XBRL and contained in Exhibit 101.

* Filed herewith

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date: November 5, 2026


ADVANCED DRAINAGE SYSTEMS, INC.

By:						/s/ D. Scott Barbour
						D. Scott Barbour
						President and Chief Executive Officer
						(Principal Executive Officer)

By:						/s/ Scott A. Cottrill
						Scott A. Cottrill
						Executive Vice President, Chief Financial Officer and Secretary
						(Principal Financial Officer)

By:						/s/ Tim A. Makowski
						Tim A. Makowski
						Senior Vice President, Chief Accounting Officer