I'm not a tax person, but there may be one who joins in the thread at some point. I don't know if the following will be right for you or not. I will just tell you this anecdotally as to how I handled something similar. I had something very similar happen to me with a mutual fund company. I had sold shares a couple years earlier, and then there was a settlement for some mismanagement of the share values. Since it had been over a year, and since I no longer had the mutual fund shares, I reported it as a long-term capital gain on Form 8949 with a zero basis.
