Equity compensation at a private company, whether a Series B startup or a pre-IPO unicorn, operates under fundamentally different rules and risks than equity at a public company. The illiquidity, valuation uncertainty, and tax complexity create planning challenges that don’t exist once a company is publicly traded. This guide breaks down what you need to understand before making any financial decisions tied to private company equity.

The Core Difference: No Public Market

At a public company, your RSUs or options have an observable, daily market price, and you can typically sell your shares immediately upon vesting or exercise. At a private company, none of that is true. There’s no public market, no daily price discovery, and, in most cases, no ability to sell your shares at all until a specific liquidity event occurs, such as an IPO, an acquisition, or a secondary sale offered by the company.

This illiquidity is the central fact that should govern how you think about private company equity. The value on your offer letter or in your equity tracking software is, at best, a current estimate — not a number you can act on the way you could with public company shares.

Understanding the 409A Valuation

Private companies are required to obtain an independent appraisal, known as a 409A valuation, to establish the fair market value of their common stock for tax purposes — most importantly, to set the strike price for new option grants. This valuation is typically updated annually or after a significant fundraising event.

The 409A valuation is almost always lower than the price investors pay for preferred stock in funding rounds, often substantially lower, reflecting the additional rights and protections preferred shareholders receive. This gap is one of the most common sources of confusion for employees: the headline valuation reported in the press after a funding round (based on preferred stock pricing) is not the value used to determine your common stock strike price or tax liability.

Millennial Wealth Tip: If your company hasn’t updated its 409A valuation in over 12 months, or hasn’t updated it since a significant funding event, that’s worth flagging — stale valuations create real tax risk, particularly around option exercise timing and AMT exposure.

ISOs vs. NSOs at a Private Company

The same option types found at public companies, incentive stock options (ISOs) and non-qualified stock options (NSOs), also exist at private companies, with the same tax treatment differences. ISOs offer potentially favorable tax treatment (no ordinary income at exercise and potential long-term capital gains treatment on the full gain if holding requirements are met) but also trigger AMT exposure. NSOs are simpler but trigger ordinary income tax at exercise on the full spread between the strike price and the fair market value.

The complication at a private company is that exercising options — and potentially paying real tax dollars, particularly AMT on ISOs — doesn’t give you a liquid asset you can sell to cover that tax bill. You may owe meaningful taxes on paper gains for shares you cannot sell. This is one of the most significant financial planning risks specific to private company equity, and it requires careful advance planning rather than a reactive decision when an exercise deadline approaches.

Double-Trigger RSUs: The Modern Standard

Many later-stage private companies now grant RSUs rather than options, structured with double-trigger vesting. This means two separate conditions must be satisfied before shares are actually delivered to you: a time-based vesting schedule (similar to public-company RSUs) and a liquidity event, typically an IPO or acquisition.

The practical implication: you can be fully time-vested in your RSUs and still own nothing, recognize no income, and owe no tax, until the liquidity event trigger also fires. This protects employees from the AMT and liquidity problems associated with options, but it also means your equity value is entirely contingent on an event that may or may not happen, and whose timing is largely outside your control.

Tender Offers and Secondary Sales

Some later-stage private companies periodically offer tender offers, structured opportunities for employees to sell a portion of their vested shares to investors at a set price, even without a full IPO or acquisition. These are not guaranteed or predictable, but when offered, they represent one of the only ways to achieve partial liquidity on private company equity before a full exit event.

If your company offers a tender offer opportunity, it’s worth evaluating seriously. Partial diversification ahead of an uncertain future liquidity event is generally a prudent risk management move, even if you remain optimistic about the company’s prospects.

Planning Considerations Specific to Private Equity

• Exercising ISOs early, before significant valuation appreciation, can reduce AMT exposure, but only makes sense with genuine conviction in the company and available cash to cover both the exercise cost and any resulting tax liability, with no certainty of when (or if) liquidity will arrive.
• Some companies allow early exercise of unvested options, paired with an 83(b) election, which starts the capital gains holding period immediately and can meaningfully reduce future tax liability, but carries the real risk of losing the money entirely if you leave before vesting or the company fails.
• If you leave a private company, you typically have a limited window (often 90 days, though some companies extend this) to exercise vested options before forfeiting them — a decision that needs to be made with full awareness of cost and risk, not under time pressure.
• Private company equity should generally be treated as a high-risk, potentially-zero-value asset in your overall financial plan, not counted as a sure thing when budgeting for major goals.

The Bottom Line: Private company equity compensation carries meaningfully more risk and complexity than public company equity — illiquidity, valuation uncertainty, and the possibility of paying real taxes on an asset you can’t yet sell. None of this means private company equity isn’t valuable; for many employees, it represents a meaningful wealth-building opportunity. But it requires deliberate, advanced planning rather than the more straightforward, reactive approach that can work reasonably well for public-company RSUs.