
	June 30, 2026		September 30, 2025
Secured Debt:

Revolving Credit Facility due May 2028	$	35.0	$	—
Subordinated Debt:
8.00% Senior Notes due July 2030	650.0		650.0
6.75% Senior Notes due December 2027	—		150.0
Accounts Receivable Securitization Facility	43.0		45.8
Total principal amount of debt	728.0		845.8
Finance lease liabilities	11.5		15.5
Unamortized deferred financing costs	(11.4)		(13.6)
Total carrying value of debt and finance lease liabilities	728.1		847.7

Current portion of finance lease liabilities	(5.6)		(7.9)
Total long-term carrying value of debt and finance lease liabilities	$	722.5	$	839.8

The Company is party to its 2023 Credit Agreement, dated April 20, 2016 (as amended and restated as of November 26, 2019, as amended and restated as of May 5, 2023, as further amended by the First Amendment to the Credit Agreement, dated as March 27, 2024, the Second Amendment to the Credit Agreement, dated as of August 12, 2024, the Third Amendment to the Credit Agreement, dated as of September 13, 2024, the Fourth Amendment to the Credit Agreement, dated as of December 12, 2024, and the Fifth Amendment, dated as of June 16, 2025), (together the “Amended and Restated 2023 Credit Agreement”).

The Fifth Amendment, dated as of June 16, 2025 under the Amended and Restated 2023 Credit Agreement, among other things, fixed the aggregate revolving commitments at $325.0 million. The revolving credit facility under the Amended and Restated 2023 Credit Agreement is secured by substantially all existing and future U.S. assets of the Company, the Goderich mine in Ontario, Canada, and capital stock of certain subsidiaries.

As of June 30, 2026 and September 30, 2025, the Company had outstanding borrowings of $35.0 million and $0.0 million, respectively, under its revolving credit facility. Also, as of June 30, 2026, outstanding letters of credit totaling $18.2 million further reduced the available borrowing capacity under the Company’s $325.0 million revolving credit facility to $271.8 million. Borrowings, if any, accrue interest at a rate per annum based on, at the Company’s option, the Adjusted Term SOFR Rate, Adjusted EURIBO Rate, Canadian Prime Rate, or Sterling Overnight Index Average, plus applicable margin. As of June 30, 2026, the weighted average interest rate on the revolving credit facility borrowings under the Amended and Restated 2023 Credit Agreement was approximately 5.8%.

On June 16, 2025, the Company issued $650.0 million aggregate principal amount of its 8.00% Senior Notes due 2030 in a private offering, pursuant to an indenture, dated June 16, 2025 (the “2030 Notes”), among the Company, the subsidiary guarantors named therein and Computershare Trust Company, N.A., as trustee. The 2030 Notes are senior unsecured obligations, with interest payable semi-annually on January 1 and July 1. The 2030 Notes are guaranteed by certain of the Company’s domestic subsidiaries. The 2030 Notes will mature on July 1, 2030. The Company incurred $13.3 million in deferred financing costs, including arrangement, legal and other fees, and will be amortized to interest expense over the 5-year term of the 2030 Notes.

The Company used the net proceeds from the 2030 Notes to (i) repay $43.5 million under the revolving credit facility and $191.3 million under the term loan under its senior secured credit facility, (ii) redeem approximately $350.0 million of its 6.75% Senior Notes due 2027 (the “2027 Notes”) at a redemption price of 101.125% of the principal amount, plus accrued and unpaid interest, (iii) pay transaction-related fees and expenses, (iv) increase cash on its balance sheet, and (v) for general corporate purposes. The redemption, completed on June 17, 2025, resulted in a loss on debt extinguishment of $7.6 million, for both the three and nine months ended June 30, 2025. The loss was comprised of a $3.9 million prepayment premium related to

the partial redemption of the 2027 Notes and a $3.7 million write-off of unamortized deferred financing costs related to the partial redemption of the 2027 Notes and the repayment of the Company’s term loan under its Amended and Restated 2023 Credit Agreement.

The indenture governing the 2030 Notes contains covenants limiting other indebtedness, dividends, purchases or redemptions of stock, transactions with affiliates, and mergers and sales of assets.

In November 2019, the Company issued $500.0 million aggregate principal amount of its 2027 Notes. The 2027 Notes were unsecured obligations and were guaranteed by certain of the Company’s domestic subsidiaries. Interest on the 2027 Notes was due semi-annually on June 1 and December 1. The 2027 Notes were scheduled to mature on December 1, 2027 and were subordinated to all existing and future indebtedness. The indenture governing the 2027 Notes contained covenants limiting other indebtedness, dividends, purchases or redemptions of stock, transactions with affiliates, and mergers and sales of assets.

On March 30, 2026, the Company redeemed in full the remaining $150.0 million outstanding 2027 Notes using cash on hand at 100% of principal plus accrued interest through, but excluding, the redemption date. The Company recorded a $0.0 million and $0.5 million loss on extinguishment of debt related to the write-off of deferred financing costs, respectively, during the three and nine months ended June 30, 2026.

On June 30, 2020, certain of the Company’s U.S. subsidiaries entered into a committed revolving accounts receivable financing facility (the “AR Facility”) of up to $100.0 million with PNC Bank, National Association (“PNC”), as administrative agent and lender, and PNC Capital Markets, LLC, as structuring agent. The AR Facility was further amended by the First Amendment to the AR Facility, dated as of June 27, 2022, the Second Amendment to the AR Facility, dated as of January 31, 2023, the Third Amended to the AR Facility, dated as of March 27, 2024 (extending the AR facility to March 2027), the Fourth Amended to the AR Facility, dated as of August 12, 2024, and the Fifth Amendment to the AR Facility, dated as of September 13, 2024.

In connection with the AR Facility, one of the Company’s U.S. subsidiaries, from time to time, sells and contributes receivables and certain related assets to a special purpose entity and wholly-owned U.S. subsidiary of the Company (the “SPE”). The SPE finances its acquisition of the receivables by obtaining secured loans from PNC and the other lenders party to a receivables financing agreement. A U.S. subsidiary of the Company services the receivables on behalf of the SPE for a fee. In addition, the Company has agreed to guarantee the performance by its subsidiaries. The Company and its subsidiaries do not guarantee the loan principal or interest under the receivables financing agreement or the collectability of the receivables under the AR Facility.