sure, the most obvious is they steal a trade which you the customer were entitled to.  if you&#x27;re bidding for 1000 shares in something that trades 15000 shares a day, they lean on your bid, buy on a different exchange than you&#x27;re posted on, take your trade, and try to flip it for the spread.  there are many many other ways they rip you off, but stealing doesn&#x27;t necessarily mean a trade through -- even though you&#x27;ll never (i mean this quite literally) NEVER - get a fill on a limit order with ib unless it trades through you.