COcheesehead
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Harvesting to me means that you are selling your losers and keeping your winners....
If every share has the same price you either have all as a gain or all as a lost... no decision to be made as you cannot 'harvest' a specific lot...
But you can harvest a specific position, partially or completely to offset gains taken or incurred from another position.