Post-Seed / Pre-Series A 409A Valuation

Post-seed and pre-Series A 409A valuations require full Option Pricing Model (OPM) analysis and waterfall modeling to properly allocate enterprise value between multiple preferred share classes and common stock. This is often the stage where companies encounter Big 4 auditors for the first time.

Published April 20, 2026

3 min read

Key Takeaways

OPM waterfall analysis is required to properly allocate value with multiple preferred classes

This stage often marks the first Big 4 audit, making a high-quality 409A report essential

Common stock FMV is typically 30–40% below the last preferred round price

Full DCF analysis with 3-5 year projections is standard at this stage

Bridge rounds and SAFEs must be properly modeled in the cap table

Investors will scrutinize your cap table and equity grants during due diligence

409A Valuation Between Seed and Series A

The post-seed, pre-Series A period is often the most active for option granting — you're hiring aggressively, your cap table is becoming more complex, and investor scrutiny is intensifying. A high-quality 409A is essential not just for compliance, but for investor diligence readiness.

Full OPM Analysis

At this stage, the Option Pricing Model (OPM) becomes the standard for equity allocation. The OPM treats each class of stock as a call option on the company's total enterprise value, with exercise prices set at the liquidation preference of each preferred class. Key components include:

Breakpoints: Identification of liquidation preference thresholds at which different share classes participate
Black-Scholes modeling: The value of each "call option" at each breakpoint is calculated using Black-Scholes or a binomial model
Volatility assumption: Based on comparable public company volatility and adjusted for private company risk
Expected term: Estimated time to liquidity event (typically 3–5 years)
Discount rate: Risk-free rate from US Treasury securities

Handling Bridge Rounds and SAFEs

Many companies at this stage have outstanding convertible notes or SAFEs from bridge rounds. These instruments must be properly modeled in the cap table before the 409A can be completed:

Convertible notes with conversion caps affect the fully-diluted share count and OPM breakpoints
SAFEs with MFN provisions or pro-rata rights add complexity to the allocation model
Your appraiser will need the terms of all outstanding instruments, including discount rates, caps, and interest accrued

Preparing for Series A Diligence

Your Series A investors will review your cap table, option grants, and 409A history as part of legal and financial due diligence. Common issues that arise at this stage include:

Grants made with an expired 409A
Strike prices below the 409A FMV
Missing board resolutions for option grants
Incomplete option grant agreements

Addressing these issues proactively — before you're in due diligence — saves significant time and potentially deal-threatening complications.