409a Basics

Are 409A Valuations Applicable to Private or Public Companies?

Most people associate 409A valuations with startups and private companies, but the rules apply more broadly than that. This article breaks down how 409A valuations work for both private and public companies, and what the key differences are for each.

By 409.ai team - 2025-07-15

When most people hear "409A valuation," they think of startups and early-stage private companies. And while private companies are by far the most common context for this type of valuation, the rules under Section 409A of the Internal Revenue Code apply more broadly. Understanding how [409A valuations](https://www.409.ai/articles/what-is-a-409a-valuation-a-comprehensive-guide) work for both private and public companies, and where the key differences lie, is important for founders, executives, employees, and investors across all stages of a company's growth.

Why Private Companies Need 409A Valuations

For private companies, a 409A valuation is not optional. Any private company that issues stock options or other forms of equity-based compensation to employees, advisors, or service providers is [required to obtain one](https://www.409.ai/articles/the-need-for-409a-valuations/) before making those grants. The valuation establishes the fair market value (FMV) of the company's common stock, which sets the minimum exercise price at which options can be granted without triggering immediate tax consequences for employees.

The core challenge for private companies is the absence of a publicly traded price. Unlike public companies, where the stock price is determined in real time by the market, private company shares are not openly traded. Appraisers must instead rely on a combination of financial data, industry comparables, company-specific information, and accepted valuation methodologies, including the income approach, market approach, and asset-based approach, to arrive at a defensible FMV.

Private company valuations also require specific adjustments that are not typically necessary for public companies. Two of the most significant are:

Discount for lack of marketability (DLOM): Private company shares cannot be easily bought or sold. Because of this illiquidity, appraisers apply a discount to reflect the additional risk and time it would take for a shareholder to realize a return on their investment. This discount directly affects the FMV conclusion and, by extension, the strike price employees receive.

Discount for lack of control (DLOC): Minority shareholders in a private company typically have little influence over business decisions. This lack of control is factored into the valuation and can further reduce the per-share FMV relative to what a controlling interest might be worth.

For employees of private companies, these dynamics work in their favor. A lower FMV means a lower strike price, which means more potential upside if the company grows and eventually exits. This is one of the [key advantages of a properly conducted 409A valuation](https://www.409.ai/articles/advantages-of-409a-valuation-how-it-benefits-businesses) for both the company and its team.

Private companies must update their 409A valuations at least once every 12 months, and sooner if a material event occurs such as a new funding round, an acquisition, or a significant change in business operations.

Do Public Companies Need 409A Valuations?

Public companies have a significant advantage when it comes to determining the value of their stock: the market does it for them. Because shares are traded openly on an exchange, the current market price is generally accepted as a reasonable proxy for FMV for most purposes.

However, Section 409A still applies to public companies in certain situations. The most common scenario is when a public company grants stock options or stock appreciation rights (SARs) with an exercise price below the current market price. This can happen unintentionally when options are granted during a period of price volatility, or when administrative errors lead to grants being dated incorrectly. In these cases, a formal 409A valuation may be needed to establish a defensible FMV and demonstrate compliance.

Public companies with complex equity structures, including multiple share classes, convertible instruments, or significant option pools, may also benefit from independent valuations in specific circumstances, particularly during M&A activity where the FMV of common stock needs to be carefully established for equity compensation purposes.

Additionally, public companies with international operations face added complexity. Employees located in different tax jurisdictions may be subject to local regulations that interact with Section 409A in ways that require careful analysis and documentation.

The IPO Transition: A Critical Moment for Both Types

One of the most important moments where private and public company valuation worlds intersect is the IPO process. As a private company approaches a public offering, the SEC and external auditors closely scrutinize the history of 409A valuations to ensure that common stock was not systematically underpriced relative to the eventual IPO price. Large, unexplained jumps in valuation between recent 409A reports and the IPO price range raise questions about the validity and methodology of prior valuations.

This is why companies that plan to go public benefit significantly from maintaining a consistent, well-documented history of defensible 409A valuations throughout their private stage. It reduces friction during SEC review, builds credibility with underwriters, and avoids the "cheap stock" issue that has historically delayed or complicated public offerings.

Key Differences at a Glance

Data availability: Public companies rely on real-time market prices. Private companies require independent appraisals using financial data, comparables, and valuation models.

Illiquidity adjustments: Private company valuations require discounts for lack of marketability and control that are not applicable to publicly traded shares.

Frequency of requirement: For private companies, a 409A valuation is a routine, ongoing compliance requirement tied to every option grant cycle. For public companies, it arises only in specific circumstances where market price alone is insufficient.

Complexity at exit: As a private company transitions toward an IPO or acquisition, the rigor and consistency of its 409A history becomes a direct factor in how smoothly the transaction proceeds.

Conclusion

409A valuations are primarily associated with private companies, and for good reason. The legal requirement, the complexity of determining FMV without a public market, and the direct impact on employee equity compensation all make it a central part of how private companies manage their equity programs. But the rules extend to public companies in certain situations as well, and any company issuing equity-based compensation should understand when and how Section 409A applies to them. Whether you are a founder of a startup or an executive at a publicly traded company, getting the valuation right is essential to protecting both your business and the people you are compensating.