Lock Up Period
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IPO Process Library · 08 Post-IPO Life
Last Updated | November 11, 2026
IPO Lock-Up Period
A lock-up is a contractual restriction that prevents insiders and major holders from selling their shares for a set time after the IPO. It keeps supply from flooding the market while the stock finds its footing.
- Lock-ups are signed with the underwriters and commonly run around 180 days, though terms vary.
- They usually cover directors, officers, and large pre-IPO shareholders, and often employees.
- Staged, earnings-based, or price-based early releases have become more common.
- Lock-up expirations can add selling pressure as large blocks become eligible for sale.
What a lock-up does
In the lock-up agreement, holders promise not to sell, pledge, or hedge their shares without the lead underwriters' consent for the lock-up period. It protects the aftermarket by limiting the number of shares that can trade, and it signals that insiders are committed to the company. Employees are often bound through a market standoff clause in equity plans.
Common lock-up terms
| Feature | What to expect |
|---|---|
| Length | Often around 180 days; shorter and longer periods exist. |
| Who is covered | Directors, officers, major shareholders, and often most pre-IPO holders. |
| Staged release | A portion of shares freed after earnings or after a set number of days. |
| Price-based release | Shares freed if the stock trades above a threshold for a stated period. |
| Exceptions | Certain transfers, such as gifts or estate planning, if recipients agree to be bound. |
| Underwriter waiver | The lead banks can release shares early, with disclosure. |
What happens when it expires
When a lock-up ends, a large block of shares can become eligible for sale, subject to securities rules such as Rule 144 for affiliates. Investors watch these dates because the potential supply can weigh on the price, though many insiders sell gradually and some hold. The effect depends on the size of the unlocked block, trading volume, and company performance.
What to check in the prospectus
- The exact lock-up length and any staged or early release terms.
- The number of shares and percentage of the company covered.
- Exceptions that allow transfers or sales.
- Whether the lock-up has changed in a later amendment.
Common questions
Does every IPO have a lock-up?
Most underwritten IPOs do. Direct listings often have no traditional lock-up.
Can the underwriters waive it?
Yes. Early releases occur, and material ones are typically announced.
Methodology & Sources
Synthesizes SEC rules and guidance (Securities Act of 1933, Exchange Act of 1934, Regulation S-K), NYSE/Nasdaq listing standards, FINRA rules, and public S-1 filings. Cross-checked against primary documents. Rules, thresholds, and timelines change; confirm current requirements with counsel before acting. General education, not legal or investment advice.
Author: Erwin Castro
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