| Type | Meaning |
|---|---|
| RSU (Restricted Stock Unit) | Shares granted that vest on a schedule — used at public companies |
| ISO (Incentive Stock Option) | Option to buy shares at strike price — tax-advantaged, US only |
| NSO (Non-Qualified Stock Option) | Option to buy shares — taxed as income on exercise |
| 409A valuation | Independent valuation of private company shares — sets strike price |
| strike price | The price at which you can buy shares (should be below market value) |