I’m looking for a way to watch for options assignment/settlement on expiration. Is there an event that I can subscribe to that will notify me when this occurs and provide information about options settlement?

Would that not show up as a trade?? For example +100 shares of what the option was for?

Thanks for the reply Mel. Would this show up as a trade? In my mind its not a “trade” since it is an action taken by the broker (as opposed to the account owner), but I could be wrong. The TWS api docs do not provide much if any information about this.?

In my particular use case I am trying to automate an ES options strategy, so when a (hopefully profitable) option position is held to expiration, it would be settled as cash to the account. I am trying to detect settlement programmatically for logging purposes. ?In my experience thus far, none of the trade callback methods I provide when opening the position are called if the option is held to expiration.?

From the ib_async docs I see a few global events that seem promising for capturing this. Namely updatePortfolioEvent, positionEvent, accountValueEvent.?

I don't use that myself, so I can't be certain.? But if I sold a put and held to expiry (and I get put the shares), in my transactions I see two transactions... Buy the put @ $0, that one I could see not showing up as a trade, but the other is to buy 100 shares at the strike.? That one should show up under trades.? It's been a while, but there was I think client ID 0 or 1 that included trades through TWS.? That may nbe the issue si ce the trade wasn't initiated via the API, so maybe try checking client ID 0 or 1 for transactions.

Once I got settled on a long ITM option (0.99 delta) for which I sold the underlying to end-up with a net zero position. Interestingly enough for almost 24h my portfolio was showing just the short part altough the margin requirement was almost zero but not exactly zero. When I asked IB they said they do Monte Carlo for the margin and that is why it varies. Somehow they kept track of the long position internally but was not showing in TWS nor API.