- Conversion of derivative security (usually options)
* E - Expiration of short derivative position (usually options)
* H - Expiration (or cancellation) of long derivative position with value received (usually options)
* O - Exercise of out-of-the-money derivative securities (usually options)
* X - Exercise of in-the-money or at-the-money derivatives securities (usually options)

Other sections 16b exempt transactions and small acquisition codes
* G - Bona fide gift form of any clauses
* L - Small acquisition