Open interest and volume: reading the crowd

Two columns on the options chain quietly tell you whether a contract is worth trading at all: volume and open interest. They're easy to confuse and worth keeping straight.

The difference

• Volume is how many contracts traded today. It resets each session. It's a snapshot of current activity.
• Open interest is how many contracts currently exist — positions that have been opened and not yet closed. It builds and decays over time.

Think of volume as today's foot traffic and open interest as the size of the standing crowd. A contract can have a busy day (high volume) but little lasting interest, or deep open interest with a quiet session.

Why you should glance at both

Together they're your fastest liquidity read:

• High volume and open interest usually mean tight spreads and easy entries and exits — the contract is alive.
• Thin on both is a warning: you may struggle to get filled at a fair price, and worse, to get out when you need to.

The trap

The most expensive mistake is putting on a position in a contract with healthy-looking value but almost no liquidity. It looks fine going in. It becomes a problem when you try to leave and discover there's no crowd on the other side.

Before you trade a contract, spend two seconds on these two numbers. They won't tell you where the price is going — but they'll tell you whether you can act on your view without paying a liquidity tax to do it.

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This article is educational and does not constitute investment advice or a recommendation. Options trading involves substantial risk and is not suitable for every investor. Autopilot Options does not guarantee profits or prevent losses. Past performance and historical data do not guarantee future results.