This was a pretty straight-forward "split" made only slightly more complex by the reverse split.
Your original post only mentioned the "split" and asked "how do I report." The answer to that direct question is you don't. A split, in an of itself is not a reportable event.
In your subsequent comment the real question emerged: "i sold it all but not sure how to report"
You will receive two 1099-B's.
You'll enter the sales using the "Stocks, Mutual Funds, Bonds, Other" interview.
Perhaps the two 1099-B's will report the correct basis for the two sales. Whether they do or not depends very much on when and how you acquired the stock. If the 1099-B's report the basis properly, you simply enter the sales exactly as they read.
If the two 1099-B don't report the basis you simply split the basis in your original purchase of Alcoa as:
Arconic
0.732566 x original basis in Alcoa
Alcoa
0.267434 x original basis in Alcoa
Your holding period for both stocks is exactly the same and depends on when you originally bought Alcoa.
In both cases you can simply say that you "bought" the stock you're selling - Arconic or Alcoa - and simply enter a total basis for the lot of stock according to the above calculations.
Tom Young
