A limit order at the beginning

Quote from ProgrammerGuy:

if you place a buy limit order at $51 before the stock market opens, and the first tick is $50.50, are you guaranteed to get it at $50.50?

is this guy serious?
 
Quote from speculatus:

Why do you think he's not? Market openings are not so trivial, especially on NYSE...

Ah, NYSE is yet another story onto itself.....
 
Quote from kiwi_trader:

Imagine the scenario. There is 1 seller at 50.50 and 3 sellers at 51 and 5 sellers at 53 (theres a gap there for some reason :))

You have a buy order at 51 but 6 other orders or even just one large enough to absorb all the available sellers is in front of yours in the queue.

They fill.

The matching will be done at 51 in your scenario.
 
it all depends at which market center your order is resting, and if opening auctions are reg nms protected or not (i don't know, but maybe someone else knows).
 
Quote from trade4succes:

it all depends at which market center your order is resting, and if opening auctions are reg nms protected or not (i don't know, but maybe someone else knows).

Please correct me if I'm wrong, but AFAIK, opening and closing trades are not "covered orders" (since thy require special handling) and thus exempt from RegNMS.
 
Quote from speculatus:

Please correct me if I'm wrong, but AFAIK, opening and closing trades are not "covered orders" (since thy require special handling) and thus exempt from RegNMS.

ah ok, so in this case, if the order is resting on a certain marketcenter, and another marketcenter's opening auction prints $0.50 below your price, there is nothing you can do. but if the order was on that marketcenter which had the opening auction priced $0.50 below, you would have gotten that $0.50 below price.
 
Quote from trade4succes:

ah ok, so in this case, if the order is resting on a certain marketcenter, and another marketcenter's opening auction prints $0.50 below your price, there is nothing you can do. but if the order was on that marketcenter which had the opening auction priced $0.50 below, you would have gotten that $0.50 below price.

Not sure this is true. My understanding is that open/close trades are traded through and hit the book of a particular exchange - no routes to other venues because of RegNMS.
 
Quote from speculatus:

Not sure this is true. My understanding is that open/close trades are traded through and hit the book of a particular exchange - no routes to other venues because of RegNMS.

yes, that was in a complicated way what i was trying to say ;-)
 
look, all I know is that my spouse had a limit order to sell shares of stock at 101. It opened at 102, the brokerage co. said too bad, they didn't fill at 102 becuase they had too many other orders waiting in line to be filled, so we got the price at 101, not 102, tuff luck!
 
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