™A displayed ask of $50.10 for 100 shares indicates an offered selling price for that displayed size, not a promise that a larger order fills entirely there.
Orders & Market Structure
Ask
The lowest displayed price at which a seller is currently willing to sell.
Plain-English context
Put the definition to work.
An ask is an offered price for stated size, not a guaranteed transaction price or the seller's fair-value estimate.
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