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Stock options: what happens if I leave a company and then an acquisition is finalized?
When you exercise your options, you come up with cash to buy the shares. This makes you an owner of the company for shares at the share price your options let you have. Ideally, your share price is at a significant discount to what the company is worth. Being a shareholder, you gain from any share price appreciation in a sale. The only thing the "60-day window" applies to is whether you come up with the cash to buy fast enough, or your shares get permanently deleted from the company finances, where everyone else potentially makes more, you make nothing. The sale of the company is based on whenever the sell finalizes, which is between your company and the acquiring company.