A limit price is a plan, not a fill

A limit order can make a screen look tidy. It still leaves one question open: will the market trade enough size at that price for your plan to exist?

The number you enter is a boundary, not a guarantee of execution.

Separate the price from the fill

Write down the maximum price, requested size, and minimum useful fill before sending the order. A five-cent improvement is irrelevant if only one share trades and the rest of the idea depends on fifty.

When the book changes, record what actually filled. Do not treat the remaining quantity as exposure you already own.

Plan the partial-fill case

Imagine a 100-share order with 35 shares filled. Decide whether the smaller position still has an edge, whether to cancel the rest, or whether a second order would change the risk.

If the trade needs two legs, a partial fill on one side is a different position from the paired trade. Give it its own stop, size limit, and time window.

Put an expiry on the idea

A quote can stay attractive after the information that created it has gone stale. Set a cancel condition tied to time, price, or a change in the market rules.

The useful question is not whether your limit is better than the current quote. It is whether the fill you can realistically get still makes the complete plan work.

Further reading: Prices and order books · Resolution rules · Current fees.

Explore the markets: Open Polymarket (referral link).