A split is a corporate action in which a company's existing shares are divided into multiple shares. Although the number of shares outstanding increases by a specific multiple, the total dollar value of the shares remains the same compared to pre-split amounts.
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Important: The logic above should be appropriate for the WHOLE ratio option splits (5 for 1, 4 for 1, etc), but the generated entries may NOT be correct for ODD ratios split (3 for 2, 5 for 4, etc). In those cases, you'll need to review the official OCC directions to see how they handle the option split, and adjust the entries accordingly. You can search The OCC Information Memos for proper handling of option corporate actions.
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