Option exercise
Converting a derivative holding into shares, reported under transaction code M and often paired with a same-day sale.
Updated 2026-07-26
An exercise moves value from the second table of a Form 4 into the first: the option disappears, shares appear. Read alone, the share line looks like an acquisition, which is why exercises are one of the main sources of miscounted insider activity.
Many exercises are immediately followed by a sale of some or all of the resulting shares, often on the same filing, to cover the exercise price and the tax. The net change in the insider's economic position can be far smaller than either line suggests.
Options also expire. An exercise near an expiry date reflects a deadline, not necessarily a decision about price.
Related terms
4 entries- Equity grant
- Shares or units an insider receives as compensation, reported under transaction code A rather than as a purchase.
- Form 4
- The filing in which a company insider reports a change in their holdings, normally within two business days.
- Open market purchase
- An insider buying shares on the market with their own money, reported under transaction code P.
- Transaction code
- The one or two letter code on each row of a Form 4 that says what kind of change occurred.
Where this appears in the data
Written for reading the records published here. This is not a legal, tax or accounting definition, and where a jurisdiction defines the term precisely, that definition governs.