What is option volume?
In one line: Option volume is the number of contracts of one option, at one strike and expiry, that have traded so far today, and it resets to zero each trading day.
How it works
Every time a contract changes hands, volume goes up by one. A buyer and a seller meeting counts as one trade, not two. At the next day's open, the count starts again at zero.
Volume is easy to mix up with Open interest:
- Volume is the number of contracts traded today. It's live, and it resets every day.
- Open interest is the number of contracts still open at the end of the last trading day. It's updated once a day, overnight.
A trade can raise open interest (two new positions), lower it (two positions closing) or leave it flat (one opens, one closes). Volume goes up either way.
An example (hypothetical)
Here are XYZ's 30-day puts at 2 p.m. (an illustration, not a trade idea). Say you sell one, and XYZ ends at $40.
| Strike | Volume today | Open interest | Bid / ask | If you sell at the bid and XYZ ends at $40 |
|---|---|---|---|---|
| $45 | 1,200 | 8,000 | $0.95 / $1.00 | Assigned: −$405 |
| $44 | 3 | 40 | $0.40 / $0.90 | Assigned: −$360 |
The $45 trades all day, with a tight spread. You'll likely get filled near $1.00, and you can close later at a fair price.
The $44 barely trades. Selling at the bid means taking $0.40 when the middle is $0.65. Getting out later may cost just as much. A math example, not a promise.
Low volume isn't bad by itself. Many good strikes trade little on a quiet day. It's a clue, not a verdict. Look at the spread and the open interest too.
Why it matters for sellers
In the wheel strategy, you'll often close or roll before expiry. That needs someone on the other side at a fair price. Volume and open interest together tell you how likely that is. Our guide on how to read an options chain shows where both columns sit.
Watch for sudden spikes too. Huge volume on a strike with little open interest means lots of new trading today. Often there's news, or one big trade. Find out what's going on before you sell into it.
Questions
What's a good volume number for an option?
There's no fixed line. A tight bid-ask spread and decent open interest matter more. Volume helps confirm that people are trading the strike today.
Why is volume zero on my strike?
No contracts have traded yet today. It may still have open interest and a fair spread. Check those before you decide.
Does high volume mean the stock will move?
Not by itself. It means a lot of trading in that option today, for reasons you may not know.
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