You received Brighthouse stock in exchange for Metlife Stock. You don't have to report anything for the exchange of stock. You do, however, need to report the cash you received for the fractional shares.
So, with 8/10/17 as the date of sale, your net proceeds were $5.34. You can use zero for your original cost basis, and enter the purchase date as the date you originally bought the MetLife stock.
I am including here an answer to this question provided by Tom Young in this forum. He goes into a discussion of how to allocate cost basis between the two stocks for future sales of either stock. He also mentions you could just claim the amount received for the fractional shares as Other Income or Miscellaneous Income. You would then be taxed on the cash received at ordinary income rates, but, with such a small amount involved, it wouldn't have much impact on your overall return and it's certainly easier.
https://ttlc.intuit.com/replies/6507753
