No, it is not uncommon that taxpayers need to make price adjustments in connection with mergers, acquisitions, reverse stock splits, etc. Make the necessary adjustment as suggested by @MinhT1. While the amount may have only a minor impact on your taxes, your return will be accurate as long as the adjustment is warranted.
Keep the records that you have in the event you may need to explain your justification for making the adjustment.
@pginotti
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