| Investments Fair Value Hierarchy |
The following table presents investments of the Plan measured at fair value on a recurring basis:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | December 31, 2024 | | | Level 1 | | Total | | Level 1 | | Total | Mutual funds | | $ | 165,884,532 | | | $ | 165,884,532 | | | $ | 167,466,925 | | | $ | 167,466,925 | | Olin Corporation common stock | | 26,901,921 | | | 26,901,921 | | | 42,871,537 | | | 42,871,537 | | Self-directed brokerage investment | | 79,420,336 | | | 79,420,336 | | | 67,001,138 | | | 67,001,138 | | Total categorized investments measured at fair value | | $ | 272,206,789 | | | $ | 272,206,789 | | | $ | 277,339,600 | | | $ | 277,339,600 | | Collective trust funds with fair value measured at net asset value (1) | | | | 1,217,681,956 | | | | | 1,067,004,957 | | Total investments, at fair value | | | | $ | 1,489,888,745 | | | | | $ | 1,344,344,557 | |
(1)Investments in collective trust funds are measured at fair value using the net asset value (NAV) per share (or its equivalent) as a practical expedient and have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statements of net assets available for benefits.
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| Investments Measured at Net Asset Value |
The following table summarizes investments for which fair value is measured using NAV per share practical expedient: | | | | | | | | | | | | | | | | | December 31, | | | 2025 | | 2024 | Galliard Managed Income Fund D | | $ | 77,550,989 | | | $ | 76,464,939 | | JPMCB Core Plus Bond | | 36,604,152 | | | 32,749,006 | | Northern Trust All Country World ex-US Investable Market Index | | 52,662,967 | | | 43,087,822 | | Northern Trust Extended Equity Market Index | | 18,147,027 | | | 16,451,996 | | Northern Trust S&P 500 Index | | 260,535,622 | | | 220,037,383 | | T. Rowe Price Age Based Funds | | 772,181,199 | | | 678,213,811 | | Collective trust funds with fair value measured at NAV | | $ | 1,217,681,956 | | | $ | 1,067,004,957 | |
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