IPO Lock-Up Period

What Is an IPO Lock-Up Period?

An IPO lock-up period is a window of time following a company's initial public offering during which company insiders — including employees, executives, directors, and early investors — are contractually prohibited from selling their shares. Lock-up periods typically last 90 to 180 days, with 180 days being the most common. The lock-up is not required by securities law but is a standard agreement between the company and its IPO underwriters, designed to prevent a flood of insider selling that could depress the stock price immediately after the IPO.

For startup employees who have exercised stock options and held shares for years, the lock-up period represents the final delay between their paper wealth and actual liquidity.

How the IPO Lock-Up Period Works

Standard Terms

Most lock-up agreements prevent insiders from selling, transferring, or hedging their shares during the lock-up window. The lock-up typically begins on the date of the IPO and lasts 180 days, though some companies negotiate shorter periods (90 days) or staggered releases (e.g., 25% of shares released at 90 days, the remainder at 180 days).

Who Is Subject to the Lock-Up

Lock-up agreements typically apply to:

• Employees who hold shares (through exercised options or otherwise)
• Executives and directors
• Founders
• Pre-IPO investors (VCs, angels)

The specific scope depends on the lock-up agreement. Some companies apply the lock-up broadly to all shareholders, while others exempt certain small holders.

Early Release and Modifications

Underwriters have the discretion to waive or modify lock-up restrictions before the lock-up expires. This is relatively rare but can happen if the stock is performing well and additional supply is needed to meet market demand. Conversely, in volatile markets, lock-up extensions have occasionally been agreed upon to prevent further price declines.

The Lock-Up Expiration Event

The expiration of the lock-up period is a significant market event. When the lock-up expires, a large pool of previously restricted shares becomes available for sale. This often creates selling pressure, and the stock price may decline around the lock-up expiration date. Sophisticated investors and analysts closely track lock-up expiration dates for this reason.

Practical Implications for Startup Employees

You Cannot Sell Immediately After the IPO

Even though the company is now public and your shares are theoretically liquid, you cannot sell during the lock-up period. The stock price may rise or fall during this time, and you have no ability to reduce your exposure. This is a period of significant risk, especially if your net worth is heavily concentrated in company stock.

Price Volatility at Lock-Up Expiration

Historically, stock prices have tended to experience increased volatility and sometimes a decline around lock-up expiration as insiders sell. This means the price you ultimately sell at may be lower than the IPO price or the price during the lock-up period. Planning for this possibility — and not anchoring to a specific price — is important for your financial planning.

Holding Period Interactions

The lock-up period can actually help you meet long-term capital gains holding requirements. If you exercised your options more than a year before the IPO, the lock-up period simply extends your holding period further. If you exercised less than a year before the IPO, the lock-up period may push you past the one-year mark, converting what would have been short-term gains into long-term capital gains.

Tax Planning During the Lock-Up

Use the lock-up period to plan your tax strategy for when you can finally sell. Consider which lots to sell first (based on exercise date and cost basis), how much to sell in the first year versus spreading across tax years, and whether any shares qualify for QSBS exclusion. Working with a tax advisor during this period is strongly recommended.

How It Relates to Exercising Stock Options

If your company is approaching an IPO, the lock-up period is a critical factor in your exercise planning. Exercise timing relative to the IPO affects your holding period for capital gains purposes and your AMT exposure. Exercising well before the IPO starts the holding period clock earlier, potentially enabling a qualifying disposition soon after the lock-up expires. If you wait to exercise until after the IPO, you will need to hold for an additional year before long-term capital gains treatment is available — and you may face a higher FMV (and larger tax bill) at the time of exercise.