Ask price
What is Ask price?
The ask price is the lowest displayed price at which a seller is currently willing to sell a specified quantity of an asset.
For adjusted historical equity series, quotes and corporate actions need compatible treatment. A split-adjusted ask cannot be compared directly with an unadjusted execution quantity, and total-return adjustments should never be represented as prices that a trader could actually have received.
What the quote represents
The best ask, also called the best offer, is specific to a venue, timestamp, and size. It can change or disappear before an incoming order arrives. Consolidated quotations may combine venues but still omit hidden liquidity. Dealer markets can show indicative or firm offers under different conventions, making source and executability essential parts of the observation.
Ask size and execution
A buyer can generally access only the quantity offered at each price. An order larger than the best ask may trade through higher levels, creating a worse volume-weighted average price. New sellers, cancellations, price improvement, and routing decisions can change the result. The displayed ask therefore is a marginal quote, not a guaranteed cost for the entire intended position.
Example
With a $50.00 bid and a $50.08 ask for 100 shares, a market purchase of 50 shares might fill near $50.08. A 5,000-share purchase in a thin book could lift the average materially above it. A limit at $50.08 caps the permitted price but may fill partially or not at all if competing demand reaches the offer first.
Portfolio applications
An ask can help estimate the replacement cost of a short position or the entry cost of a new long position. Midpoint marks can understate liquidation cost when spreads are wide. For portfolio simulations, apply the side of market appropriate to each trade, plus size-dependent impact, fees, and taxes. Using closing midpoints for all transactions introduces optimistic backtest results.
Practical interpretation
View ask, size, spread, depth, volatility, and trading status together. Confirm whether delayed data or differing time zones make a quote stale. Avoid interpreting a high ask as proof that the asset is worth that amount because an unexecuted seller can request any price. Reproducible analytics should preserve the exact quote source, currency, adjustment status, and timestamp.
Also known as: offer price
Sources and further reading
- Trade Execution: What Every Investor Should Know, U.S. Securities and Exchange Commission
- Types of Orders, Investor.gov, U.S. Securities and Exchange Commission