Listed-stock limit envelopes versus market-order routing

Priced limits can complete first

On listed names a priced limit can be matched by the book or a post assistant, while a market order waits for the specialist to set the print, so the limit can complete first.

The archive presents that contrast as a listing-book workflow. The priced ticket is already executable against standing interest. The market ticket still waits for the specialist print.

A two-sided envelope around displayed size

A limit envelope is a pair of working priced orders placed just inside large displayed demand and supply so a cleanup of that size can complete the smaller tickets at a better print. The small bid sits one increment above large displayed demand. The small offer sits one increment below large displayed supply.

Prints one or two increments through a large bid or offer often take that size and force nearby shorts or longs to cover, so the tape tends to migrate toward the largest standing interest. That tendency is the size magnet.

That two-sided placement around size is an envelope tactic, not a one-sided momentum entry from only the bid or only the offer.

A cheaper ticket can still lose on the fill

A cheaper market-order commission can be smaller than the implementation-cost gap on the same ticket. The implementation-cost gap is the difference between a lower ticket fee and a worse fill price across the full share count of the trade. The supplied contrast is a 20-dollar fee saving versus a 200-dollar worse fill on a 2,000-share trade.

Who sets the print

Brokers may prefer customer market orders because those tickets are not bound to a stated price, leave more reporting discretion, and can be internalized or sold to a third-party destination. Internalized routing is a broker completing a customer order in-house or sending it to a third-party destination instead of exposing it as a priced interest on the listing book.

Before sending a marketable ticket, the trader needs to know whether the broker rather than the listing venue will set the print through internalization or sale of the order.

Floor clerks complete immediately executable contras at the better standing price and report residual market-order imbalance so the specialist can decide where to print the excess and supply liquidity. Immediately executable interest is a live bid or offer that a floor clerk can complete against a contra at the better standing price without waiting for a new auction.

When a market order is reserved

In this historical workflow a market order is reserved for the final seconds of the session when a position must be flattened before the close.