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What happens to an options contract during an all stock acquisition?
According to this article: With an all-stock merger, the number of shares covered by a call option is changed to adjust for the value of the buyout. The options on the bought-out company will change to options on the buyer stock at the same strike price, but for a different number of shares. Normally, one option is for 100 shares of the underlying stock. For example, company A buys company B, exchanging 1/2 share of A for each share of B. Options purchased on company B stock would change to options on company A, with 50 shares of stock delivered if the option is exercised.  This outcome strongly suggests that, in general, holders of options should cash out once the takeover is announced, before the transactions takes place.  Since the acquiring company will typically offer a significant premium, this will offer an opportunity for instant profits for call option holders while at the same time being a big negative for put option holders.  However, it is possible in some cases where the nominal price of the two companies favours the SML company (ie. the share prices of SML is lower than that of BIG), the holder of a call option may wish to hold onto their options. (And, possibly, conversely for put option holders.)