18. EARNINGS PER SHARE

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Basic income per share excludes dilution and is computed by dividing net income attributable to Huntsman Corporation by the weighted average number of shares outstanding during the period. Diluted income per share reflects all potential dilutive common shares outstanding during the period and is computed by dividing net income attributable to Huntsman Corporation by the weighted average number of shares outstanding during the period increased by the number of additional shares that would have been outstanding as potential dilutive securities. Diluted income per share is computed using the treasury stock method for all stock-based awards.

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Basic and diluted income per share is determined using the following information (in millions):

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Additional stock-based awards of approximately 1.4 million and 1.3 million weighted average equivalent shares of stock were outstanding during the three months ended September 30, 2023 and 2022, respectively, and approximately 1.8 million and 0.9 million weighted average equivalent shares of stock were outstanding during the nine months ended September 30, 2023 and 2022, respectively. However, these stock-based awards were not included in the computation of diluted income per share for the respective periods mentioned above because the effect would be anti-dilutive.

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