This is the second time this happened. It happened last expiration day as well. Here are my positions as of last night: es 640 put - long es 660 put- short es 960 call -short es 980 call -long es 970 call -short es 990 call -long I have been holding these positions for 4 weeks and this morning IB comes and buys to close my 960 calls. I got an e-mail saying I had a margin call (excess liquidity) and they closed the position. What pissed me off is that the market was a lot higher and closer to my 960 calls a couple of days ago and I wasn't getting any margin calls. Now today (last day) IB comes and liquidate my position. I called them and the guy said since it is too far out of the money, they think it is not going to be exercised so they stripped the options from my account. When I asked to explain how I could avoid this again he basically didn't know how.