Ameritrade investors were transferred to Schwab. If I knew of any others were better I would get out. Have to consider if that broker could survive a crash. They also have ways to slow down your trades too, like money moving fast doesn’t matter to them or doing it on purpose. Like buying a ETF for a short term trade and get a lecture I’m supposed to read first before placing the trade. I can’t remember what stock they refused the GTC but I think it was pre open hours. I might try that high ask trick on.GTC and see what happens. They also give you a lecture if you buy and sell the same day and not a pattern but see a change in direction once and preventing losses.