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EXHIBIT 99.1
Press Release

Clean Harbors Announces Third-Quarter 2026 Financial Results

•Delivers 21% Growth in Revenues to a Record $1.87 Billion, Driven by Both Operating Segments
•Generates 75% Increase in Q3 Net Income to $208.1 Million, or EPS of $3.93
•Achieves 42% Growth in Q3 Adjusted EBITDA to $456.1 Million; Expands Adjusted EBITDA Margin YoY by 370 Basis Points to 24.4%
•Raises 2026 Guidance for Both Adjusted EBITDA and Adjusted Free Cash Flow
•Announces Executive Transition – Eric Gerstenberg to Become Sole CEO on January 1; Mike Battles to Retire as Co-CEO and Board Member at Year-End (See Separate News Release Issued Today)

NORWELL, Mass. – October 28, 2026 – Clean Harbors, Inc. (“Clean Harbors” or the “Company”) (NYSE: CLH), the leading provider of environmental and industrial services throughout North America, today announced financial results for the third quarter ended September 30, 2026.
“Our third-quarter results reflect the strength of our market position and robust demand for our environmental services and sustainable products,” said Eric Gerstenberg, Co-Chief Executive Officer. “Revenues increased 21% and Adjusted EBITDA grew 42% year-over-year, resulting in a record Adjusted EBITDA margin of 24.4%. Environmental Services (ES) delivered better-than-expected results, supported by a sizeable emergency response event, growth in PFAS-related work, strong waste volumes and pricing initiatives designed to offset inflation and higher fuel costs. Safety-Kleen Sustainability Solutions (SKSS) also generated significant profitability, as market pricing for our re-refined products remained high amid global shortages. Together, these results drove record adjusted free cash flow of $323 million. At the same time, we continued to execute safely, with our year-to-date Total Recordable Incident Rate of 0.49 on track to match the best performance in our history.”
Third-Quarter 2026 Results
Revenues increased 21% to $1.87 billion, compared with $1.55 billion in the same period of 2025. Income from operations rose 65% to $318.1 million, compared with $193.0 million in the third quarter of 2025.
Net income increased 75% to $208.1 million, or $3.93 per diluted share, compared with $118.8 million, or $2.21 per diluted share, for the same period in 2025.
Adjusted EBITDA (see description and reconciliation below) increased 42% to $456.1 million from $320.2 million for the same period in 2025.
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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Third-Quarter 2026 Segment Review
“Our ES segment generated an Adjusted EBITDA margin of 27.4%, marking its 18th consecutive quarter of year-over-year margin expansion,” said Gerstenberg. “Our Field Services business was the largest contributor with revenue growth of more than 70%. This was driven by considerable emergency response activity, including one substantial event that generated approximately $120 million of revenue at emergency response rates, given the scale and expedited timeframe of the work. Revenue in Technical Services rose 3% with incineration utilization of 87%. Underlying disposal and recycling demand remained healthy, with deferred revenue increasing 20% due to our backlog of waste and growing sales pipeline. Safety-Kleen Environmental Services revenue rose 11%, supported by pricing and continued momentum in its core offerings. Industrial Services posted modest growth despite ongoing softness in refinery turnaround activity. Overall, ES delivered another exceptional quarter, underscoring the broad-based demand trends we have seen throughout 2026.”
“SKSS segment revenue increased 46% in Q3 and Adjusted EBITDA was 209% higher, with segment margin more than doubling from the year-ago period,” said Mike Battles, Co-Chief Executive Officer. “This segment continues to benefit from market dynamics, with global supply disruptions supporting higher prices for refined products, including base oil and lubricants. We also continued to improve our mix and profitability, increasing Group III production by approximately 20% from a year ago and selling more direct blended gallons. Importantly, we also maintained discipline around feedstock costs, collecting 62 million gallons of waste oil while maintaining an average charge-for-oil position. The combination of strategic execution and favorable market conditions drove the highest quarterly revenue and profitability in SKSS history.”
Business Outlook
“We continue to pursue our growth strategy through a combination of acquisitions and organic growth investments,” Gerstenberg said. “The successful completion of the ES&H and EnviroServe acquisitions brings our total to five transactions this year, expanding our capabilities and supporting long-term profitable growth. At the same time, we are investing in areas where we see the potential for compelling returns. That includes a $55 million investment in a Los Angeles site that will expand our Hub concept to the West Coast. These initiatives reflect our focus on deploying capital into markets where we see meaningful opportunities to grow.”
“We expect to enter 2027 with momentum across both operating segments,” Battles concluded. “Within Environmental Services, collection volumes into our disposal and recycling network remain strong, supported by improving U.S. manufacturing activity and continued reshoring. Our 10-year contract announced earlier this year has commenced in Q4, while our PFAS pipeline remains robust across both water filtration and remediation. We believe that recent large-scale emergency response projects and acquisitions further strengthen the outlook for Field Services, and our data center offerings are getting traction within Industrial Services. For SKSS, market conditions remain supportive of our re-refining spreads, complemented by solid execution across the business. Taken together, we see a clear path to achieve record results for 2026 and expect multiple catalysts for continued growth in 2027.”
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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Financial Guidance
In the fourth quarter of 2026, Clean Harbors expects Adjusted EBITDA to grow 23% to 26% year over year. Based on its year-to-date performance and current market conditions, Clean Harbors is raising the midpoint of both its 2026 Adjusted EBITDA guidance and adjusted free cash flow guidance by $80 million. For the full year, Clean Harbors now expects:
•Adjusted EBITDA in the range of $1.44 billion to $1.48 billion, with a midpoint of $1.46 billion. This Adjusted EBITDA range is based on anticipated GAAP net income in the range of $528 million to $563 million.
•Adjusted free cash flow in the range of $600 million to $660 million, with a midpoint of $630 million. This range is based on anticipated net cash from operating activities in the range of $970 million to $1,090 million.

Non-GAAP Results:

Adjusted EBITDA Reconciliation
Clean Harbors reports Adjusted EBITDA, which is a non-GAAP financial measure and should not be considered an alternative to net income or other measurements under generally accepted accounting principles (GAAP) but viewed only as a supplement to those measurements. Adjusted EBITDA is not calculated identically by all companies, and therefore the Company’s measurement of Adjusted EBITDA may not be comparable to similarly titled measures reported by other companies. Clean Harbors believes that Adjusted EBITDA provides additional useful information to investors because the Company’s management routinely evaluates the performance of its businesses based upon levels of Adjusted EBITDA. The Company defines Adjusted EBITDA as described in the following reconciliation showing the differences between reported net
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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income and Adjusted EBITDA for the three and nine months ended September 30, 2026 and 2025 (in thousands, except percentages):
Three Months EndedNine Months Ended
September 30, 2026September 30, 2025September 30, 2026September 30, 2025
Net income$208,100 $118,799 $441,765 $304,384 
Accretion of environmental liabilities3,531 3,499 10,575 10,710 
Stock-based compensation11,745 8,922 36,141 22,620 
Depreciation and amortization122,703 114,729 360,309 342,994 
Other income, net(1,524)(3,517)(1,223)(1,982)
Interest expense, net of interest income37,438 35,700 108,500 108,883 
Provision for income taxes74,095 42,027 156,899 103,641 
Adjusted EBITDA$456,088 $320,159 $1,112,966 $891,250 
Adjusted EBITDA Margin24.4 %20.7 %22.0 %19.7 %
Adjusted Free Cash Flow Reconciliation
Clean Harbors reports adjusted free cash flow, a non-GAAP measure, which it considers to be a measurement of liquidity that provides useful information to investors about its ability to generate cash. The Company defines adjusted free cash flow as net cash from operating activities less additions to property, plant and equipment plus proceeds from sale and disposal of fixed assets. When necessary, the Company adjusts for the cash impact of items derived from non-operating activities. Additionally, adjusted free cash flow excludes significant strategic growth investments, as they are not indicative of free cash flow for the current period. Adjusted free cash flow should not be considered an alternative to net cash from operating activities or other measurements under GAAP. Adjusted free cash flow is not calculated identically by all companies, and therefore the Company’s measurement of adjusted free cash flow may not be comparable to similarly titled measures reported by other companies.
An itemized reconciliation between reported GAAP net cash from operating activities and adjusted free cash flow is as follows (in thousands):
Three Months EndedNine Months Ended
September 30, 2026September 30, 2025September 30, 2026September 30, 2025
Net cash from operating activities$419,203 $301,987 $664,673 $511,632 
Additions to property, plant and equipment(172,842)(94,445)(397,480)(303,169)
Cash investments in strategic growth projects71,983 11,904 107,305 24,340 
Proceeds from sale and disposal of fixed assets4,789 11,187 8,483 15,250 
Adjusted free cash flow$323,133 $230,633 $382,981 $248,053 
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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Adjusted EBITDA Guidance Reconciliation
An itemized reconciliation between projected GAAP net income and projected Adjusted EBITDA is as follows (in millions):
For the Year Ending December 31, 2026
Projected GAAP net income$528to$563
Adjustments:
Accretion of environmental liabilities16to15
Stock-based compensation50to53
Depreciation and amortization500to490
Interest expense, net160to155
Provision for income taxes186to204
Projected Adjusted EBITDA$1,440to$1,480
Adjusted Free Cash Flow Guidance Reconciliation
An itemized reconciliation between projected GAAP net cash from operating activities and projected adjusted free cash flow is as follows (in millions). The Company excludes significant strategic growth investments, from which the Company expects to realize future long-term benefits, as they are not indicative of free cash flow generation for the current period.
For the Year Ending December 31, 2026
Projected net cash from operating activities$970to$1,090
Additions to property, plant and equipment(530)to(590)
Cash investments in strategic growth projects145to145
Proceeds from sale and disposal of fixed assets15to15
Projected adjusted free cash flow$600to$660
Conference Call Information
Clean Harbors will conduct a conference call for investors today at 9:00 a.m. (ET) to discuss the information contained in this press release. During the call, management will discuss Clean Harbors’ financial results, business outlook and growth strategy. Investors who wish to listen to the webcast and view the accompanying slides should visit the Investor Relations section of the Company’s website at www.cleanharbors.com. The live call also can be accessed by dialing 877.709.8155 or 201.689.8881 prior to the start time. The webcast will be archived on the Company’s website after the conclusion of the live event.
About Clean Harbors
Clean Harbors (NYSE: CLH) is North America’s leading provider of environmental and industrial services. The Company serves a diverse customer base, including a majority of Fortune 500 companies. Its customer base spans a number of industries, including chemical, manufacturing and refining, as well as numerous government agencies. These customers rely on Clean Harbors to deliver a broad range of services such as end-to-end hazardous waste management, emergency spill response, industrial cleaning and maintenance, and recycling
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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services. Through its Safety-Kleen subsidiary, Clean Harbors also is a leading provider of parts washers and environmental services to commercial, industrial and automotive customers, as well as North America’s largest re-refiner and recycler of used oil. Founded in 1980 and based in Massachusetts, Clean Harbors operates in the United States, Canada, Mexico, Puerto Rico and India. For more information, visit www.cleanharbors.com.
Safe Harbor Statement
Any statements contained herein that are not historical facts are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans to,” “seeks,” “will,” “should,” “estimates,” “projects,” “may,” “likely,” “potential,” “outlook” or similar expressions. Such statements may include, but are not limited to, statements about the Company’s future financial and operating results, plans, strategy, objectives and goals, strategic initiatives, cost management initiatives, pricing and productivity initiatives, contingent liabilities, interest expense, liquidity, business, economic and market conditions, trends, customer demand, expectations regarding new customer contracts, impacts of tariffs and new legislation, acquisitions, growth opportunities and investments, expectations, challenges and other statements that are not historical facts. Such statements are based upon the beliefs and expectations of Clean Harbors’ management as of the date of this press release only and are subject to certain risks and uncertainties that could cause actual results to differ materially, including, without limitation: operational and safety risks; risks relating to the failure of new or existing technologies; risks associated with the use of artificial intelligence; cybersecurity risks; the occurrence of natural disasters or other catastrophic events, as well as their residual macroeconomic effects; risks associated with retaining and hiring key personnel; environmental liability and product liability risks relating to hazardous waste management and other components of the Company’s business; negative economic, industry or other developments, including market volatility or economic downturns; risks associated with management’s assumptions relating to expansion of the Company’s landfills; reductions in the demand for emergency response services at industrial facilities or on roadways, railways or waterways, and other remedial projects and regulatory developments; reductions in the demand for oil products and automotive services and volatility in oil prices in the markets the Company serves; changes in statutory and regulatory requirements and risks relating to extensive environmental laws and regulations; risks associated with existing and potential litigation; risks associated with the Company’s identification and execution of strategic capital expenditures, acquisitions and divestitures and their related liabilities; risks relating to the availability and sufficiency of the Company’s insurance coverage, self-insurance, surety bonds, letters of credit and other forms of financial assurance; the impact of new tax legislation or changes in tax regulations and interpretations; the imposition of trade sanctions or tariffs; fluctuations in interest rates and foreign currency exchange rates; risks relating to the Company’s indebtedness and covenants in its debt agreements; risks associated with certain anti-takeover provisions under the Massachusetts Business Corporation Act and the Company’s By-Laws, and those items identified as “Risk Factors” in Clean Harbors’ most recently filed reports on Form 10-K and Form 10-Q. Forward-looking statements are neither historical facts nor assurances of future performance. Therefore, readers are cautioned not to place undue reliance on these forward-looking statements. Clean Harbors undertakes no obligation to revise or publicly release the results of any revision to these forward-
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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looking statements other than through its filings with the Securities and Exchange Commission, which may be viewed in the “Investors” section of Clean Harbors’ website at www.cleanharbors.com.

Contacts:
Eric J. Dugas
Jim Buckley
EVP and Chief Financial Officer
SVP Investor Relations
Clean Harbors, Inc.
Clean Harbors, Inc.
781.792.5100
781.792.5100
InvestorRelations@cleanharbors.com
Buckley.James@cleanharbors.com
    
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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CLEAN HARBORS, INC. AND SUBSIDIARIES
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share amounts)

Three Months EndedNine Months Ended
September 30, September 30,
2026202520262025
Revenues$1,869,449 $1,549,337 $5,063,991 $4,531,141 
Cost of revenues1,208,014 1,048,490 3,348,359 3,103,871 
Selling, general and administrative expenses217,092 189,610 638,807 558,640 
Accretion of environmental liabilities3,531 3,499 10,575 10,710 
Depreciation and amortization122,703 114,729 360,309 342,994 
Income from operations318,109 193,009 705,941 514,926 
Other income, net1,524 3,517 1,223 1,982 
Interest expense, net(37,438)(35,700)(108,500)(108,883)
Income before provision for income taxes282,195 160,826 598,664 408,025 
Provision for income taxes74,095 42,027 156,899 103,641 
Net income$208,100 $118,799 $441,765 $304,384 
Earnings per share:
Basic$3.94 $2.22 $8.36 $5.67 
Diluted$3.93 $2.21 $8.34 $5.65 
Shares used to compute earnings per share - Basic52,75253,51852,81253,659
Shares used to compute earnings per share - Diluted52,89753,71352,96953,871

Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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CLEAN HARBORS, INC. AND SUBSIDIARIES
CONDENSED CONSOLIDATED BALANCE SHEETS
(in thousands)
September 30, 2026December 31, 2025
Current assets:(unaudited)
Cash and cash equivalents$423,544 $826,315 
Short-term marketable securities93,010 127,363 
Accounts receivable, net1,273,770 1,044,137 
Unbilled accounts receivable218,442 160,888 
Inventories and supplies407,922 372,088 
Prepaid expenses and other current assets96,346 116,452 
Total current assets2,513,034 2,647,243 
Property, plant and equipment, net2,757,283 2,541,067 
Other assets:
Operating lease right-of-use assets254,827 255,084 
Goodwill1,843,273 1,479,050 
Permits and other intangibles, net866,755 653,027 
Other long-term assets48,433 48,585 
Total other assets3,013,288 2,435,746 
Total assets$8,283,605 $7,624,056 
Current liabilities:
Current portion of long-term debt$12,600 $12,600 
Accounts payable551,756 506,592 
Deferred revenue97,948 81,529 
Accrued expenses and other current liabilities525,728 441,788 
Current portion of closure, post-closure and remedial liabilities20,312 19,112 
Current portion of operating lease liabilities81,345 75,226 
Total current liabilities1,289,689 1,136,847 
Other liabilities:
Closure and post-closure liabilities, less current portion131,194 125,038 
Remedial liabilities, less current portion81,180 86,547 
Long-term debt, less current portion2,877,298 2,763,563 
Operating lease liabilities, less current portion178,294 184,308 
Deferred tax liabilities400,248 384,207 
Other long-term liabilities208,488 197,886 
Total other liabilities3,876,702 3,741,549 
Total stockholders’ equity, net3,117,214 2,745,660 
Total liabilities and stockholders’ equity$8,283,605 $7,624,056 
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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CLEAN HARBORS, INC. AND SUBSIDIARIES
UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
Nine Months Ended
September 30, 2026September 30, 2025
Cash flows from operating activities:
Net income$441,765 $304,384 
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization360,309 342,994 
Allowance for doubtful accounts9,571 6,520 
Amortization of deferred financing costs and debt discount3,930 5,024 
Accretion of environmental liabilities10,575 10,710 
Changes in environmental liability estimates(2,218)(8,933)
Other income, net(1,223)(1,982)
Stock-based compensation36,141 22,620 
Environmental expenditures(9,756)(10,960)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable and unbilled accounts receivable(276,946)(113,131)
Inventories and supplies(35,736)8,301 
Other current and non-current assets31,230 (5,467)
Accounts payable22,517 (35,492)
Other current and long-term liabilities74,514 (12,956)
Net cash from operating activities664,673 511,632 
Cash flows used in investing activities:
Additions to property, plant and equipment(397,480)(303,169)
Proceeds from sale and disposal of fixed assets8,483 15,250 
Acquisitions, net of cash acquired(689,044)— 
Additions to intangible assets including costs to obtain or renew permits(2,830)(1,528)
Purchases of available-for-sale securities(37,665)(62,108)
Proceeds from sale of available-for-sale securities71,927 74,968 
Net cash used in investing activities(1,046,609)(276,587)
Cash flows used in financing activities:
Change in uncashed checks1,716 (2,639)
Tax payments related to withholdings on vested restricted stock(15,612)(13,833)
Repurchases of common stock(77,133)(117,001)
Proceeds from employee stock purchase plan3,611 3,360 
Deferred financing costs paid(691)— 
Payments on finance leases(38,096)(25,088)
Principal payments on debt(9,450)(11,327)
Borrowing from revolving credit facility120,000 — 
Net cash used in financing activities(15,655)(166,528)
Effect of exchange rate change on cash(5,180)3,488 
(Decrease) increase in cash and cash equivalents(402,771)72,005 
Cash and cash equivalents, beginning of period826,315 687,192 
Cash and cash equivalents, end of period$423,544 $759,197 
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com
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Supplemental information:
Cash payments for interest and income taxes:
Interest paid$114,037 $133,520 
Income taxes paid, net of refunds97,644 93,531 
Non-cash investing activities:
Property, plant and equipment accrued45,391 36,604 
ROU assets obtained in exchange for operating lease liabilities55,559 51,736 
ROU assets obtained in exchange for finance lease liabilities60,586 59,937 
Supplemental Segment Data (in thousands)
Three Months Ended
RevenueSeptember 30, 2026September 30, 2025
Third-Party RevenuesIntersegment Revenues (Expenses), netDirect RevenuesThird-Party RevenuesIntersegment Revenues (Expenses), netDirect Revenues
Environmental Services$1,538,438 $12,683 $1,551,121 $1,318,580 $12,720 $1,331,300 
Safety-Kleen Sustainability Solutions331,011 (12,683)318,328 230,757 (12,720)218,037 
Corporate— — — — — — 
Total$1,869,449 $— $1,869,449 $1,549,337 $— $1,549,337 

Nine Months Ended
RevenueSeptember 30, 2026September 30, 2025
Third-Party RevenuesIntersegment Revenues (Expenses), netDirect RevenuesThird-Party RevenuesIntersegment Revenues (Expenses), netDirect Revenues
Environmental Services$4,225,418 $34,792 $4,260,210 $3,855,677 $36,771 $3,892,448 
Safety-Kleen Sustainability Solutions838,573 (34,792)803,781 675,278 (36,771)638,507 
Corporate— — — 186 — 186 
Total$5,063,991 $— $5,063,991 $4,531,141 $— $4,531,141 
Three Months EndedNine Months Ended
Adjusted EBITDASeptember 30, 2026September 30, 2025September 30, 2026September 30, 2025
Environmental Services$425,392 $357,229 $1,121,897 $1,008,014 
Safety-Kleen Sustainability Solutions126,482 40,937 252,456 107,502 
Corporate(95,786)(78,007)(261,387)(224,266)
Total$456,088 $320,159 $1,112,966 $891,250 
Clean Harbors • 42 Longwater Drive • PO Box 9149 • Norwell, Massachusetts 02061-9149 • 800.282.0058 • www.cleanharbors.com