Option Pool

An option pool is a reserved block of equity — typically common stock — set aside from a company's authorized shares to be issued to employees, advisors, directors, and other service providers as equity compensation. Option pools are standard in venture-backed startups but also appear in PE-backed and privately held companies as a tool for attracting and retaining key talent. In M&A, option pools create complexity around cap table analysis, dilution, and the allocation of transaction proceeds among shareholders.

Option pools are typically established as a percentage of fully diluted shares outstanding — commonly 10-20% in venture contexts. The pool represents shares that have been authorized but not yet issued. As options are granted from the pool, the pool is consumed. When the pool is nearly exhausted, companies often seek shareholder approval to expand it — which dilutes all existing shareholders proportionally.

In M&A transactions, outstanding stock options (both vested and unvested) must be addressed in the purchase agreement. The standard approaches include: (1) cash-out — options are cancelled and optionholders receive cash equal to the per-share merger consideration minus the exercise price for each option, funded from the deal proceeds (the "net settlement" or "cashless exercise" approach); (2) acceleration — unvested options accelerate and vest upon a change of control, creating immediate cash-out rights; (3) assumption — the buyer assumes the option obligations, converting them into options to acquire buyer equity on adjusted terms; and (4) cancellation without payment for underwater options (where the exercise price exceeds the acquisition price per share).

For SMB acquisitions without sophisticated cap tables, option-like instruments include phantom equity plans, profit interest units (in LLCs), and informal equity promises to employees. These are economically similar to stock options but have different legal and tax characteristics. Each must be identified, valued, and addressed in the purchase agreement.

In acquisitions of venture-backed businesses, option acceleration provisions ("single trigger" vs. "double trigger") significantly affect how much of the purchase price flows to employees vs. existing shareholders. Single trigger acceleration (options vest solely upon a change of control) is favorable for employees but can reduce the equity value available to founders and investors. Double trigger acceleration (requires both a change of control AND termination of employment) is more favorable for acquirers who want to retain employees through post-close employment agreements.