Originally posted by SethArb
how long can a party decide if they want to break a trade done
outside of market hours?
Do they have to let their ECN / Broker within 30 minutes?
Within the same trading day?
Before Settlement ?
( T + 3 or is it now T + 1 ) ?
In my experience, the amount of time the other party has to break a trade depends on how erroneous the erroneous quote was. Normally, the other party has to call their broker within 30 minutes of the fill. However, for trades that are obviously typos, the other party can succesfully request a bust several days afterwards. I have never had any busts happen to me past settlement day, but I have had some busts happen several days after I got a great fill (i.e., clearly a typo).
That being said, I've noticed that if I want to request a bust and I don't call within the 30 minute window, then I am hosed no matter how bad my fill was. Furthermore, any fill that you get on INSTINET, BRUT, or BTRADE that is even slightly erroneous is usually busted. If you yourself try to request a bust on INSTINET, BRUT, or BTRADE, you never get it. Apparently these ECNs view retail traders as the lowest scum on earth and try to screw them whenever possible. Other ECNs seem to be more fair in terms of busting (i.e., ISLAND, ARCHIPELAGO, and REDIBOOK).
Generally, when it comes to busting I always expect the worst outcome. If by some miracle the worst outcome doesn't happen, then I thank the trading gods.
Good luck,
Carl