Option overhang is the equity overhang from options—granted but unexercised awards and sometimes unissued pool reserves—that increases fully diluted share count before cash hits the company.

How it works

When employees hold vested or unvested options, those rights sit on top of issued shares. Cap tables typically show “fully diluted” ownership assuming all options exercise and the entire option pool is used. That assumption creates overhang: the difference between basic shares outstanding and the fully diluted total.

Overhang grows when companies grant generously, refresh the pool, or leave many options underwater (strike above fair market value). At exit, only exercised options matter for cash splits—but acquirers and IPO underwriters still care about overhang because unexercised awards may convert, net exercise, or require repricing.

Boards review overhang when approving large grants or considering a sale. Acquirers may ask employees to exercise or cancel underwater options as part of cleanup, which affects retention packages and closing conditions.

Why it matters

• Founders: High overhang shrinks your slice in fully diluted models investors use to negotiate. It also limits room for future key hires unless you expand the pool again.
• Investors: Overhang affects returns in waterfall models and signals whether the team is adequately incentivized without excessive dilution to prior rounds.

Review overhang before any secondary or tender offer pricing.

Common mistake

Ignoring overhang because options are unexercised. Term sheets and acquisition pricing usually assume fully diluted capitalization, which includes overhang.

Related ideas

See outstanding options, option pool, and option impact analysis.