ISOs may have a 10 year limit, but that's only for their ISO tax treatment status... they don't (necessarily) need to expire. They can convert to NSO by way of

ISOs may have a 10 year limit, but that's only for their ISO tax treatment status... they don't (necessarily) need to expire. They can convert to NSO by way of an extension. https://www.esofund.com/blog/nso-extension https://www.esofund.com/blog/nso-extension