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Any advantage to exercising ISO's in company that is not yet public?
As far as I know, the AMT implications are the same for a privately held company as for one that is publicly traded.  When I was given my ISO package, it came with a big package of articles on AMT to encourage me to exercise as close to the strike price as possible.  Remember that the further the actual price at the time of purchase is from the strike price, the more the likely liability for AMT.  That is an argument for buying early.  Your company should have a common metric for determining the price of the stock that is vetted by outside sources and stable from year to year that is used in a similar way to the publicly traded value when determining AMT liability. During acquisitions stock options often, from what I know of my industry, at least, become options in the new company's stock.  This won't always happen, but its possible that your options will simply translate.  This can be valuable, because the price of stock during acquisition may triple or quadruple (unless the acquisition is helping out a very troubled company). As long as you are confident that the company will one day be acquired rather than fold and you are able to hold the stock until that one day comes, or you'll be able to sell it back at a likely gain, other than tying up the money I don't see much of a downside to investing now.