IBKR didn't assign CSPs ITM
My main broker is clear that they assign every contract that's ITM by even $0.01. I started an account with IBKR for their significantly lower fees, and I had CSP contracts at two stirke prices. CCJ May 8 5 contracts at 118 and 3 contracts at 117. It closed at 116.75 and my 118 strikes were assigned, but my trade status (action) shows the 117 strikes as expired. I see the 500 shares and the 117 contract has been removed.
Is this normal? How does IBKR decide when to assign ITM CSPs? Do they really use a lottery system?
Is my other broker just being greedy, keeping the difference if ITM contracts are not assigned?
I know that most options contracts are never assigned. I thought it was becuase people sell to close positions before expiry. The info page of this group states that brokers use a lottery system to decide which ITM contracts to assign. I guess I won the lottery even though I wanted to own the share and wanted to be assigned. Ultimately, it doesn't matter given IBKR doesn't charge for assignments and I can sell more CSP at lower strike prices or near the money and start writing CCs on the 500 shares.