I had 1000 shares of AIG, that I had covered with 10 calls at two different strikes and expirations. (two batches of calls)
AIG did a 20:1 REVERSE SPLIT around the first of July, so instead of having 1000 share of AIG worth just over $1, I ended up with 50 shares of AIG stock worth just over $20.
The interesting thing is that the covered calls that I had written became "uncovered", because I only own 50 shares of AIG. This resulted in a very hefty margin requirement..
I ended up closing out of my written positions. I should have relieved myself of my AIG while I was at it.