While not a letter of the law argument, there's a spirit of the law argument here that comes from the ideas like adverse posession and the statute of limitations. The OP didn't use or even worry about the options/shares for 30 some years: the time to speak up and assert ownership was literal decades ago.
If someone has built a house on a remote lot you claim to own, while making property improvements and paying taxes, but you've never visited for 30 years; are you really entitled to swoop in and seize their house now?
If someone has built a house on a remote lot you claim to own, while making property improvements and paying taxes, but you've never visited for 30 years; are you really entitled to swoop in and seize their house now?