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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | NOTE 5. EARNINGS PER SHARE Basic and diluted net income (loss) attributable to Olin Corporation per share are computed by dividing net income (loss) attributable to Olin Corporation by the weighted-average number of common shares outstanding. Diluted net income (loss) attributable to Olin Corporation per share reflects the dilutive effect of stock-based compensation.
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Computation of Earnings per Share | (In millions, except per share data)
Net income (loss) attributable to Olin Corporation | $ | 42.8 |  |  | $ | (24.9) |  |  | $ | 42.9 |  |  | $ | 97.9 |
Weighted-average common shares - basic | 114.4 |  |  | 116.9 |  |  | 114.9 |  |  | 118.4 |
Dilutive effect of stock-based compensation | 0.7 |  |  | — |  |  | 0.7 |  |  | 1.8 |
Weighted-average common shares - diluted | 115.1 |  |  | 116.9 |  |  | 115.6 |  |  | 120.2 |
Earnings (loss) per common share attributable to Olin Corporation: |  |  |  |  |  |  |
Basic | $ | 0.37 |  |  | $ | (0.21) |  |  | $ | 0.37 |  |  | $ | 0.83 |
Diluted | $ | 0.37 |  |  | $ | (0.21) |  |  | $ | 0.37 |  |  | $ | 0.81 |
The computation of dilutive shares does not include 3.8 million and 3.3 million shares for the three months ended September 30, 2025 and 2024, respectively, and 3.8 million and 1.9 million shares for the nine months ended September 30, 2025 and 2024, respectively, as their effect would have been anti-dilutive.

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