Derek Marsano said: Hey Tom, I'm still working on this, having received brokerage statements. The broker has simply copied the cost basis for each ALXN lot to each AZN lot, and sold the ALXN shares at $60/share. Clearly that method does not represent the true capital gain. I've attached a spreadsheet showing my calculations. Would you please look it over and let me know if it correctly captures your method? Thanks.