™A 200-share order can fill 100 shares at $50 and 100 at $50.10, giving a $50.05 average execution price before fees.
Orders & Market Structure
Fill
The execution of all or part of an order.
Plain-English context
Put the definition to work.
An average fill can conceal executions at several prices; distinguish partial quantity from completion of the full order.
Further reading and verification. Examples are hypothetical, not current quotes or recommendations. Product terms, tax treatment and market rules can change. FINRA — order types and execution