Public-Company Equity Versus Private-Company Equity

Public and private awards may share the same tax vocabulary, but the ability to sell changes almost every planning decision.

A public-company award typically has an observable market price and, after settlement or exercise, a path to sale through a brokerage account. A private-company award can have a valuation without a reliable market. That difference affects not just price but also tax funding, diversification and whether the asset can support spending.

Price discovery

Public shares trade continuously, although an employee may face blackout windows or insider-trading restrictions. Private-company prices can come from a 409A valuation, preferred financing, tender, completed secondary or nonbinding indication. Those values apply to different securities and purposes and should not be collapsed into one point estimate.

Transferability

Securities issued under private employee plans can be restricted and may not be freely traded without registration or an available exemption. Company approvals, rights of first refusal, buyer qualifications and state-law requirements can matter. A willing buyer is not enough if the holder cannot complete the transfer.

Tax funding

Public RSU withholding can often be funded by withholding or selling shares. A public option exercise may support a same-day sale. A private ISO exercise can require strike cash and create AMT exposure while the stock remains unsellable. Liquidity timing therefore belongs in every tax estimate.

Retirement-plan treatment

• Public settled shares: include as a concentrated taxable holding at the observable price, subject to normal pricing confidence.
• Private vested shares: track in net worth with valuation evidence, but exclude from spendable wealth unless a credible transaction path exists.
• Unvested awards: show as contingent future compensation, not current assets.
• Confirmed transaction: model eligible quantity, offer price, costs, tax and settlement status.
• Rumored event: What If only.

Use separate downside cases

Public employer stock can be shocked by 25%, 50% or more while the rest of the portfolio follows broad-market paths. Private stock should also include delayed or zero liquidity. The worst case may combine company-value decline with job loss because the exposures are correlated.

Sources

• Employee Benefit Plans — Rule 701 — U.S. Securities and Exchange Commission.
• Private Secondary Markets — U.S. Securities and Exchange Commission.
• Rule 144: Selling Restricted and Control Securities — U.S. Securities and Exchange Commission.
• Topic No. 427, Stock Options — Internal Revenue Service.