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Debt | 6 Months Ended
--- | ---
Jun. 29, 2025
Debt Disclosure [Abstract] |
Debt | Debt Debt at June 29, 2025 and December 29, 2024 was as follows (in millions):
| June 29, 2025 |  | December 29, 2024
ATI Inc. 7.25% Notes due 2030 | $ | 425.0 |  |  | $ | 425.0 |
ATI Inc. 5.875% Notes due 2027 | 350.0 |  |  | 350.0 |
ATI Inc. 5.125% Notes due 2031 | 350.0 |  |  | 350.0 |
ATI Inc. 4.875% Notes due 2029 | 325.0 |  |  | 325.0 |
Allegheny Ludlum 6.95% Debentures due 2025 (a) | 150.0 |  |  | 150.0 |
ABL Term Loan | 200.0 |  |  | 200.0 |
U.S. revolving credit facility | — |  |  | — |
Foreign credit facilities | — |  |  | — |
Finance leases and other | 102.9 |  |  | 109.5 |
Debt issuance costs | (12.9) |  |  | (14.2) |
Debt | 1,890.0 |  |  | 1,895.3 |
Short-term debt and current portion of long-term debt | 179.3 |  |  | 180.4 |
Long-term debt | $ | 1,710.7 |  |  | $ | 1,714.9 |
(a) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed by ATI. Revolving Credit Facility On June 13, 2025, the Company amended its Asset Based Lending (ABL) Credit Facility, which is collateralized by the accounts receivable and inventory of the Company’s operations. As amended, the ABL facility also provides the Company with the option of including certain machinery and equipment as additional collateral for purposes of determining availability under the facility. This amendment extended the ABL facility through June 2030. The amended ABL includes a $600 million revolving credit facility, a letter of credit sub-facility of up to $200 million, a $200 million term loan (Term Loan), and a swing loan facility of up to $60 million. Additionally, the amendment gives the Company the ability, through June 13, 2026 and as long as no default or event of default has occurred and is continuing, to borrow an additional term loan of up to $100 million in total, using one or two draws (the Delayed-Draw Term Loan). The Term Loan and Delayed-Draw Term Loan each bear interest at rate of 2.0% above the adjusted Secured Overnight Financing Rate (SOFR) and can be prepaid in increments of $25 million if certain minimum liquidity conditions are satisfied. In addition, the Company has the right to request an increase of up to $300 million in the maximum amount available under the revolving credit facility for the duration of the ABL. The ABL, as amended, has applicable interest rates that are consistent with the previous facility, using SOFR plus an applicable SOFR adjustment. As amended, the applicable interest rate for revolving credit borrowings under the ABL facility includes interest rate spreads based on available borrowing capacity that range between 1.25% and 1.75% for SOFR-based borrowings and between 0.25% and 0.75% for base rate borrowings. The ABL facility contains a financial covenant whereby the Company must maintain a fixed charge coverage ratio of not less than 1.00:1.00 after an event of default has occurred and is continuing or if the undrawn availability under the ABL revolving credit portion of the facility is less than the greater of (i) 10% of the then applicable maximum loan amount under the revolving credit portion of the ABL and the outstanding Term Loan balance, or (ii) $60.0 million. The Company was in compliance with the fixed charge coverage ratio as of June 29, 2025. Additionally, the Company must demonstrate minimum liquidity specified by the facility during the 90-day period immediately preceding the stated maturity date of its 6.95% Debentures due 2025 issued by the Company’s wholly owned subsidiary, Allegheny Ludlum LLC, the 5.875% Senior Notes due 2027 and the 4.875% Notes due 2029. Costs associated with entering into the ABL amendment were $2.8 million, and are being amortized to interest expense over the extended term of the facility ending June 2030, along with $1.9 million of unamortized deferred costs previously recorded for the ABL. The ABL, as amended, also contains customary affirmative and negative covenants for credit facilities of this type, including limitations on the Company’s ability to incur additional indebtedness or liens or to enter into investments, mergers and acquisitions, dispositions of assets and transactions with affiliates, some of which are more restrictive at any time during the term of the ABL when the Company’s fixed charge coverage ratio is less than 1.00:1.00 and its undrawn availability under the revolving portion of the ABL is less than the greater of (a) $120 million or (b) 20% of the sum of the maximum loan amount under the revolving credit portion of the ABL and the outstanding Term Loan balance. As of June 29, 2025, there were no outstanding borrowings under the revolving portion of the ABL facility, and $29.4 million was utilized to support the issuance of letters of credit. There were no revolving credit borrowings under the ABL facility during the year-to-date periods ended June 29, 2025 or June 30, 2024. The Company also has foreign credit facilities, primarily in China, that total $72 million based on June 29, 2025 foreign exchange rates, none of which was drawn as of June 29, 2025 or December 29, 2024.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A Reference 2: http://www.xbrl.org/2003/role/disclosureRef 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