BMY says:
"a Celgene stockholder that is a U.S. holder(1) will recognize taxable capital gain or loss in an amount equal to the difference, if any, between (i) the sum of (A) the amount of cash, including cash in lieu of fractional shares, received by such U.S. holder in the merger, (B) the fair market value of the shares of Bristol Myers Squibb common stock received by such U.S. holder in the merger, and (C) the fair market value of the CVRs received by such U.S. holder in the merger, each determined on the date of the completion of the merger and (ii) such U.S. holder’s adjusted tax basis in the shares of Celgene common stock exchanged therefor."
In other words, what you got minus your cost basis.
Report as Long or Short Term, depending on your holding period.
