Quick pointer: this entry covers the structural setup of founders stock at formation (vesting, repurchase rights, the RSPA, the share split). For the tax-advantaged characteristics (QSBS treatment, 83(b) mechanics, the holding-period math), see [Founder Shares].
Founders stock is the common stock issued to founders at company formation, typically subject to vesting and company repurchase rights. Granted at a nominal purchase price reflecting the near-zero fair market value at formation, it is accompanied by an 83(b) election filed within 30 days to lock in tax treatment at grant-date value and start the long-term capital-gains holding clock immediately. It is the structural foundation of founder equity, and the choices made...