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Got it, thanks! That makes sense. In case anyone with similar questions finds this thread, I'll add that the other issue I noticed with placing MOO orders on a paper trading (IBKR) account is that ~half of those I tried were not filled. One was a partial fill. Very happy to know this is...

Thank you! One other (beginner-level) follow-up question: Do MOO orders usually get filled in their entirety or is it common for them to be cancelled?

Thank you for the response! I will try live trading this with a small amount and check it that way.

I am debugging a market-on-open (MOO) order using the IBKR API (currently just in paper trading). Everything I read suggests using MOO should get a fill at the open price. I'm getting substantial slippage between the ticker.open price (in the IBKR API) and the price IBKR says that I actually...