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What happens to an options contract during an all stock acquisition?
Depends on your contract, cash or shares delivered? If shares, then you get 5     BIG shares. Theres no longer any options. If you sell instantly, theoretically you will net the $10 difference + profit above strike. If cash, same thing just that you get cash $50 less strike.  Applies to cash and stock deals Options are binary, never pro-rated. if converted, basically you end up with BIG shares.