I probably should know the answer to these questions, but I don't. Perhaps it's a "brain cloud" thing... Anyway, say I sold a 500/495 XYZ Bull Put Spread when XYZ was at $503. Then XYZ falls and the stock price is currently 492. Now the Buyer of my XYZ 500 Put decides to sell his Put for a profit. Does my Spread fall apart? Probably not, so is the new owner of the 500 XYZ Put now on the other side of my trade? Does that 500 XYZ Put have a Spread ID number, so the current owner is always involved in my Spread? Am I informed when the owner of that particular Put becomes someone else?