You are not really trading the options in the after hours market, you are trading stock in the after hours market against options you traded before the market closes. Most brokers allow access to this after hours market. What you want to check is what is the cutoff time the broker requires for option exercises.
Great info. But do market makers sell those OTM options near expiration, and wouldn’t this expose them to risk?
To update, Friday Tsla 799.50 about 1 min before the close. Bought the expiring 800 calls for .15. Tsla closed at 800.03. Sold short stock after the close at 800.35 bought back at 799.50, then added a few more scalps. Had to leave at 430et, so I then filed a "do not exercise" on my calls as they were .03 in the money and finished with no position.
I think there is an additional risk here, if for some reason there is a mistake in filing the "do not exercise" I would end up coming in with 1000 shares. I did go over it 10x but there is always that risk.
Doesn't have to be MM's. Could be another trader just trying to close out a useless option for some reason.
Then this strategy would quickly stop working if a few traders buy all such available options.
But usually MMs must post bid/ask quotes at all times and I usually see very large bid & ask qty/size with price that is continually adjusted (on liquid underlyings), which are clearly not retail traders. I just didn’t monitor them near the close.
Anyway, my question was theoretical to see if someone may have ideas how MMs may deal with such risk on their end.
You do this with 10 contracts? You made $850 in the stock trade, lost $150 on the options, you had a total profit of $600?To update, Friday Tsla 799.50 about 1 min before the close. Bought the expiring 800 calls for .15. Tsla closed at 800.03. Sold short stock after the close at 800.35 bought back at 799.50, then added a few more scalps. Had to leave at 430et, so I then filed a "do not exercise" on my calls as they were .03 in the money and finished with no position.
I think there is an additional risk here, if for some reason there is a mistake in filing the "do not exercise" I would end up coming in with 1000 shares. I did go over it 10x but there is always that risk.