There are times in a fast-moving market where I have both open Bids and Offers on the same security (specifically, I'm trading options on the Montreal Exchange, but question stands for TSX stocks too, I guess). I've heard of some US brokerages offering a "self match prevention" technology, whereby their system will prevent an order from executing against another order in the same account. (So, for example, a market Sell order for 1,000 shares would execute against the highest 1,000 shares Bid, but "jump over" any of those shares if the Bid was from the same acct.) Does this technology exist at the retail level in Canada? (The two brokerages I've asked about this - TD & IB - say they don't offer it.)