> Quoting and buying at their published bid/ask is precisely their function I think he was making a little joke about this. He said: fill my buy orders at

> Quoting and buying at their published bid/ask is precisely their function I think he was making a little joke about this. He said: fill my buy orders at the bid and sell orders at the ask I'm with him, I'd give all my business to someone who could do that. I could retire in one trading day if I could find someone to do that for me. This was exactly the downfall of Knight Capital Group. It only took about 45 minutes for them to lose $440 million.[1] Of course, that wasn't what you originally said, which was a firm who agrees to buy at the bid and sell at the ask hence the smiley at the end of his comment. There's a difference between "buy at the bid" and "fill my buy orders at the bid". :) [1] http://en.wikipedia.org/wiki/Knight_Capital_Group#2012_stock_trading_disruption http://en.wikipedia.org/wiki/Knight_Capital_Group#2012_stock...