IPO Lock-Up Expiration: What Happens to the Stock Price

Last reviewed on 28 August 2026

Day 180 arrives. The lock-up that has kept founders, employees, and pre-IPO investors from selling since the IPO is over, and for the first time the bulk of the company's shares are legally free to trade. What actually happens next — to the share price, to your account, and to your tax position — is the subject of this page.

This is the companion to our IPO lock-up period guide, which covers how lock-ups are structured and who they bind. Here we focus narrowly on the expiration event itself.

What Changes on Expiration Day

Mechanically, three things happen when an IPO lock-up expires:

1. The contractual restriction ends. The lock-up agreement between each holder and the underwriters lapses on the date stated in the prospectus. No filing or action is required; it simply expires.
2. The tradeable float expands. Before expiry, only the shares sold in the IPO (typically 10–20% of the company) trade freely. After expiry, the remaining 80–90% can, in principle, be sold. In practice a large fraction is held by venture funds and insiders who sell slowly, if at all.
3. Securities-law rules take over. Non-affiliates who have met their Rule 144 holding period can sell freely. Affiliates — officers, directors, and 10%+ holders — remain subject to volume limits, Form 144 filings, and company trading-blackout windows.

What Happens to the Stock Price

Lock-up expiration is one of the most-studied calendar events in equity markets, precisely because it is scheduled and public. The findings from academic and sell-side studies of post-2010 IPOs are fairly consistent:

• The average reaction is negative but modest. Across large samples, stocks tend to underperform by a low-single-digit percentage in the window around expiry. Averages hide a wide distribution — individual names can move 10–20% either way.
• Much of the move happens before the date. Because the date is known, traders position ahead of it. Stocks frequently drift down in the one to two weeks before expiry and then stabilise or bounce on the day itself once the "overhang" is cleared.
• High-momentum IPOs fall harder. Companies whose stock has run far above the IPO price have more holders sitting on gains, more incentive to sell, and higher valuations that are sensitive to supply.
• Stepped releases soften the impact. Where the prospectus releases shares in tranches (for example after the first earnings report), the selling pressure is spread across several dates rather than concentrated on one.

Why the stock sometimes rises at expiry

A common question from first-time holders is whether a lock-up expiry can push the price up. It can, for three reasons. First, if traders shorted the stock ahead of the date expecting a wave of selling that never materialises, they cover, and the stock rallies. Second, an expanded float allows index funds and institutions with liquidity requirements to buy, adding demand. Third, if insiders conspicuously decline to sell, the market reads that as a signal of confidence. None of these effects is reliable enough to trade on, but they explain why "the stock always drops at lock-up expiry" is a myth.

What determines the size of the move

• The ratio of locked-up shares to the existing float — a larger overhang means a larger potential supply shock.
• Who the holders are. Venture funds distributing shares to their limited partners create diffuse selling; a single large holder announcing a block sale creates concentrated selling.
• Where the stock trades relative to the IPO price and to the last private-round price. Holders under water are less likely to sell.
• Whether a secondary offering is arranged at the same time. Some companies coordinate an underwritten secondary at expiry to absorb selling in an orderly way.
• The company's first post-IPO earnings report, which often lands within weeks of expiry and can swamp the lock-up effect entirely.

Do You Have to Sell When the Lock-Up Expires?

No. Expiry removes a restriction; it does not impose an obligation. Holders fall into three broad groups after expiry:

• Sell some or all promptly. Common for employees with concentrated positions, for holders who need cash for the tax bill created by option exercises, and for early investors whose fund life requires distributions.
• Sell in tranches. The most common plan among advisers: a fixed percentage per quarter, often through a 10b5-1 plan that executes automatically and is not derailed by blackout windows.
• Hold. Founders, strategic investors, and holders who believe in the business frequently keep most of their position for years.

If you hold through an SPV or forward contract, the decision may not be yours at all. The SPV manager decides when the vehicle sells and distributes; the forward contract specifies when and how settlement occurs. See SPVs and forward contracts for how those wrappers behave at exit.

Deciding When and at What Price to Sell

There is no formula for the "right" price to sell at lock-up expiry, but a disciplined approach has a few components:

1. Write the plan before the IPO. Decide what percentage you will sell, over what period, and at what price bands, while you are still calm. Expiry-day emotion is a poor guide.
2. Anchor to your own numbers, not the IPO price. Your cost basis, your holding period for long-term capital gains, and your QSBS five-year clock matter more than where the stock priced on IPO day.
3. Size the position you would be comfortable keeping. Many advisers frame the decision as "how much would I buy today at this price?" If the answer is much less than you hold, sell the difference.
4. Use limit orders and spread the trades. Selling a large block into a thin, volatile market on expiry day rarely gets a good average price. Spreading sales across days or weeks reduces market impact.
5. Check the blackout calendar. If you are an employee or affiliate, the first post-lock-up earnings blackout may close your window within days of expiry. A 10b5-1 plan avoids this problem.

How Long Until You Have the Cash

Once you sell shares of a US-listed company, the trade settles on a T+1 basis — the cash is in your brokerage account the next business day. The delays that catch holders out come before the sale:

• Shares at the transfer agent. Many pre-IPO shares are held in book-entry form at the company's transfer agent, not in a brokerage account. Moving them into a brokerage (usually via a DWAC or DRS transfer) can take several days to a few weeks, and the restrictive legend must be removed first.
• Legend removal. Restricted stock carries a legend that must be lifted by the transfer agent, typically on the strength of a legal opinion, before the shares can trade. Start this process before expiry, not after.
• Company pre-clearance. Employees and affiliates often need pre-clearance from the company's legal team even after the lock-up ends.
• SPV distributions. If the SPV sells and distributes cash, the timeline depends on the manager and the operating agreement — often weeks rather than days.

Tax Consequences of Selling at Expiry

The sale is a taxable event, and expiry has a habit of colliding with several tax deadlines at once:

• Holding period. Shares held more than one year qualify for long-term capital gains rates. For option exercises, the clock starts at exercise, not at grant; for ISOs, selling within two years of grant or one year of exercise is a disqualifying disposition.
• QSBS. Qualified small business stock held five years or more may qualify for a full federal exclusion under Section 1202. Selling a few months short of five years can forfeit it entirely.
• AMT. If you exercised ISOs in the IPO year, the AMT preference from that exercise and the sale proceeds can land in different tax years. Model both before you sell.
• State tax. Equity earned while working in a high-tax state generally remains sourced to that state even if you have since moved.

The tax implications of selling private stock guide walks through each of these in detail.

Common Mistakes at Lock-Up Expiration

• Waiting for expiry to start the paperwork. Legend removal and transfer-agent moves take time. Holders who start at day 180 often cannot sell until day 200.
• Assuming the stock must drop. Some holders hedge aggressively or sell everything at the open on expiry day, only to watch the stock rally as the overhang clears.
• Assuming the stock must recover. The opposite error: holding a concentrated position through a 40% drawdown because "it'll come back."
• Ignoring the earnings blackout. Employees who miss the brief open window after expiry may be locked out again for weeks.
• Selling a QSBS-eligible position months before the five-year mark. Check the date before you trade.

Bottom Line

Lock-up expiration is a scheduled supply event, not a verdict on the company. The price reaction is usually smaller than feared and sometimes positive, but it is unpredictable for any single stock. What you can control is the plan: decide your selling schedule before the IPO, clear the administrative hurdles before expiry, mind the tax clocks, and execute without letting the day's price action rewrite the plan.