Reading options flow: volume, open interest and what "unusual" really means

What volume and open interest tell you, why volume above open interest is interesting, and the limits of reading flow.

By AnkushAI Editorial, Education team · Oct 30, 2026 · 1 min read

Options flow tools surface contracts that traded more than usual. Reading them well starts with two numbers.

Volume and open interest

• Volume is the number of contracts traded today. It resets every session.
• Open interest (OI) is the number of contracts still open. It is updated once a day after the close, so intraday OI is yesterday's figure.

Why volume above open interest stands out

If today's volume is larger than the open interest at the start of the day, at least some of those trades were probably new positions rather than people closing old ones. That is often what flow tools call unusual.

What flow cannot tell you

• Direction of intent. A large call purchase might be a bullish bet, a hedge against a short stock position, or one leg of a spread.
• Whether the buyer or seller started the trade, unless the data shows the trade price relative to the bid and ask. Trades near the ask lean buyer-initiated; near the bid, seller-initiated. Even that is a hint, not proof.
• Whether the position is still open tomorrow. Check how open interest changes the next day.

A sensible way to use it

• Look for size relative to normal activity in that contract, not just big dollar numbers.
• Check the expiration and strike. Far out-of-the-money, short-dated contracts are often cheap lottery tickets.
• Confirm with price. Flow that lines up with a level holding or breaking is more interesting than flow on its own.

Flow shows where money moved. It does not show why.

Educational, not financial advice.

Related articles