Executed Volume vs. Order Quantity: Cancellations, Partial Fills, and Open Orders
Orders resting in the book and shares actually traded measure different things. Learn why repeatedly placing orders does not increase volume and how to verify execution records.
Order quantity is the number of shares submitted for a potential trade; executed volume is the number actually traded with a counterparty. Resting orders can be amended or canceled, so a large displayed quantity does not mean an equivalent amount of money has already flowed in.
The same shares can trade multiple times
Daily volume accumulates the number of shares traded, rather than counting unique shares or investors. If an investor buys shares, sells them to another investor, and that person sells them again, the same economic holdings are counted several times. Order-book depth, by contrast, is the quantity of unfilled orders at a particular moment. Dividing cumulative daily volume directly by a snapshot of resting orders and calling the result an exact measure of buying strength mixes figures with different meanings.
Follow the statuses between acceptance and execution
An order screen showing that an order for 1,000 shares was accepted does not mean ownership of 1,000 shares has changed hands. Only part may fill and the rest may be canceled; amended orders also require checking their link to the original order. In your order records, distinguish original quantity, cumulative executed quantity, remaining quantity, and quantity successfully canceled. Canceling an order later does not reverse the portion already executed. If you entered an incorrect order, first establish what actually filled.
Keep trade-direction labels in perspective
Some screens classify trades executed at the ask as aggressive buying and those executed at the bid as aggressive selling. Every execution nevertheless has both a buyer and a seller, and its displayed color does not mean the company has received new capital. Classification methods differ by data provider, potentially producing differences for midpoint trades or delayed quotes. If you use a buy-side execution volume indicator, read its formula and coverage and distinguish it from total trading volume. A trading journal can store orders and executions in separate tables. Orders explain your intentions and amendments; executions explain actual changes in holdings and cash. Linking the tables by order number makes partial fills and cancellations easier to track. Use the final executed quantity to calculate portfolio weights, rather than your original intention to buy 1,000 shares.
Worked example
Hypothetical example: Suppose 300 shares of a 1,000-share buy order fill, leaving 700 shares open. If you cancel all 700 remaining shares, the final executed quantity is 300. Submitting another order for 700 shares that never fills increases the cumulative quantity you have submitted but adds no trading volume. Execution records, rather than the number of orders, establish the increase in your holdings.
What to check
- Have you distinguished accepted quantity, executed quantity, and remaining quantity?
- Were there any further executions before cancellation completed?
- Have you read how the trade-direction indicator classifies executions?
Sources and primary materials
This is educational material about research methods. For an actual company decision, verify the filings and primary sources for the relevant period.