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Option Pricing Model (OPM) in 409A Valuations: How It Works

The Option Pricing Model (OPM) is the IRS-accepted methodology for allocating total enterprise value between different share classes in a 409A valuation, treating each equity class as a call option on the company with exercise prices set at the liquidation preference breakpoints of the preferred stock.

Published April 20, 2026
3 min read

Key Takeaways

  • OPM is required for any company with preferred stock and liquidation preferences
  • OPM treats each share class as a call option on total enterprise value
  • Breakpoints are set at each liquidation preference level in the cap table
  • Key inputs are: enterprise value, volatility, expected term, risk-free rate, and DLOM
  • Higher volatility generally increases common stock value in the OPM
  • Longer expected time to liquidity reduces common stock value by applying more discounting

What is the Option Pricing Model?

The Option Pricing Model (OPM) is a mathematical framework used in 409A valuations to allocate a company's total enterprise value among its various classes of equity — common stock, seed preferred, Series A preferred, Series B preferred, options, and warrants — in a way that accurately reflects the economic rights of each class.

The core insight of the OPM is that equity classes in a venture-backed company behave like a series of call options on the total enterprise value, each with a different "exercise price" set by the liquidation preferences in the cap table.

OPM Breakpoints

Breakpoints are the enterprise values at which each preferred class begins to participate in proceeds beyond its liquidation preference. For example:

  • Breakpoint 1 ($0): All classes participate in enterprise value above zero (up to the first liquidation preference)
  • Breakpoint 2 ($5M - Seed liquidation preference): After seed preferred investors recover their $5M, remaining proceeds are shared proportionally
  • Breakpoint 3 ($15M - Seed + Series A preferences): After all senior preferences are satisfied, common and converted preferred share proportionally in upside

Key OPM Inputs and Assumptions

  • Total Enterprise Value: Derived from the primary valuation approaches (market comparables, DCF, or backsolve from last round)
  • Expected Term: Estimated time to liquidity event (typically 3–5 years for Series A, 1–2 years for late-stage). Shorter term = less time value = lower common stock value
  • Volatility: Annualized volatility of comparable public company stock returns. Higher volatility generally benefits common stockholders by increasing the probability of high-value outcomes
  • Risk-Free Rate: US Treasury bond yield matching the expected term
  • DLOM: Discount for Lack of Marketability applied to the allocated common stock value

OPM vs. PWERM

The OPM is most appropriate for earlier-stage companies (Pre-Seed through Series A) where there is significant uncertainty about the timing and nature of a liquidity event. The PWERM (Probability-Weighted Expected Return Method) is more appropriate for later-stage companies where specific exit scenarios can be modeled with meaningful probability estimates. Many Series B and later valuations use a hybrid approach — PWERM for scenario selection combined with OPM for allocation within each scenario.

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