For spin-offs, unlike dividends, the ex-date does not mean that if you buy BKS after the ex-date that you don't get the GMEB stock. The only significance of the ex-date is that beginning then, the stock starts trading on a when issued basis ex the spinoff. So there is now a BKSwi which traded a bit last week in the 25s. I saw the quote in Barron's, though I haven't been able to find it on Yahoo or Fidelity. There is also a GMEBwi. Until the actual distribution after the close on 11/12, BKS will continue to trade with the GME distribution. Not until 11/15 will BKS trade without the right to receive GMEB and, therefore, at about roughly $10 less than it closes on the 12th.