Post-IPO Lockup Extensions: How Companies Push the 180-Day Line
How post-IPO lockup agreements extend beyond 180 days, what early-release provisions look like, and the planning moves available to employees caught in an extension.
Your company IPO’d on March 15, 2026. You counted down to September 11, 2026, the 180-day lockup expiration. On August 28, the legal team sent an email: the lockup is extending by 60 days to accommodate a secondary offering. Your planned home purchase, tax payment schedule, and 10b5-1 plan effective date all just moved.
Post-IPO lockup agreements are contracts between existing shareholders and the underwriters. They restrict sales of pre-IPO shares for a defined period (usually 180 days, sometimes 90 or 365) after the IPO. Extensions are not standard but they happen. Understanding when they happen and what rights you have matters for any planning tied to lockup expiration.
This guide covers the standard lockup structure, the extension mechanisms, early-release provisions, and what employees can do when an extension hits.
The standard 180-day lockup
In a typical IPO, the underwriters require all officers, directors, and holders of more than 1% of pre-IPO stock to sign a lockup agreement. Many IPOs extend the lockup to all pre-IPO shareholders, including rank-and-file employees.
The agreement restricts:
- Sales of shares
- Pledges and hypothecations
- Hedging transactions (short sales, puts, collars, prepaid variable forwards)
- Gifts except to trusts for the signer’s benefit
The standard duration is 180 calendar days, running from the IPO pricing date or the first day of public trading.
The three ways lockups extend
Underwriter-negotiated extensions
The underwriters can request an extension if market conditions warrant. A common trigger: a planned follow-on offering or secondary offering within the first year post-IPO. If the company and underwriters agree the follow-on is best served by maintaining the lockup, the underwriters can ask shareholders to extend.
Extensions typically require signer consent, but the signer often agrees because the consent is requested by the same underwriters and company management who will influence future employment and grants.
Pricing-related extensions (less common after 2016)
Historical 10b5-1 extensions existed where lockup extended if the company issued material news close to expiration. The 2016 FINRA Rule 5131 changes made these pricing-based extensions less common, but they still appear in some deals. Read the lockup language carefully; if it includes an automatic extension triggered by earnings releases or material news, the expiration date may move on you.
Voluntary hold-back
Some employees sign longer lockups to signal commitment to the market. Executive officers often sign 365-day lockups when the broader employee pool has 180-day lockups. If you signed a longer lockup, you are bound by it regardless of what happens to the broader pool.
Early-release provisions
Modern lockups sometimes include early-release mechanics:
Price-based early release
If the stock trades above a defined price for a defined number of consecutive days (common structure: above 130% of IPO price for 10 of any 15 consecutive trading days, starting day 90 post-IPO), a percentage of shares releases early. Usually 20-33% of the lockup pool.
This mechanism became popular around 2020-2021 as companies tried to balance liquidity for employees against underwriter concerns.
Earnings-window early release
Some lockups release a percentage of shares after the first post-IPO earnings release, if earnings exceed a defined threshold. Similar structure to price-based releases.
Selected employee carve-outs
Large founder stakes sometimes get partial early release to allow charitable giving or diversification. These are negotiated case by case and do not apply to rank-and-file employees.
What an extension notice looks like
A typical extension email from the legal team:
In connection with the company’s anticipated follow-on offering, the underwriters have requested that shareholders extend the existing lockup period by 60 days. The new lockup expiration date will be November 10, 2026, rather than September 11, 2026. Please sign and return the attached extension agreement by August 30, 2026.
If the underlying lockup already permits automatic extension, the notice is informational. If consent is required, signing is usually not legally required but employees who refuse risk being perceived as uncooperative. Refusal is more common among large founder stakes than among employees.
What employees can do
Verify the extension actually binds you
Read your original lockup carefully. The language matters:
- “The Lockup Period shall be extended…” with automatic language binds you without a new signature.
- “The Lockup Period may be extended only by mutual written agreement…” requires your consent.
- Employee-specific lockups are sometimes subsumed under a broader pool agreement that gives a representative (often the general counsel) authority to extend on behalf of signers. Check whether you assigned that authority.
Restructure your 10b5-1 plan
If your 10b5-1 plan was written to start trading at the original lockup expiration, the extension delays your first trades. Modify the plan to push first-trade dates out by the extension period. Modifications of 10b5-1 plans after adoption count as new plans under the 2023 amendments, which restart the 90-day cooling-off period. Plan accordingly.
Some plans can be structured to automatically respect any lockup in effect. If yours has that provision, you do not need to modify.
Delay tax payments via 110% safe harbor
If your liquidity plan was to sell at lockup expiration to fund an April 15 tax bill, an extension to November means you are tight on payment timing. IRS safe harbor (110% of prior-year tax) avoids underpayment penalties on the final tax even if you owe a big balance at filing. Pay enough in through withholding and estimated taxes to hit safe harbor, then settle the balance after selling post-lockup.
Borrow against shares (carefully)
Some brokerages and private banks lend against pre-IPO and post-IPO shares on margin. Rates vary from SOFR + 100 basis points (for institutional-quality collateral) up to 10% or more (retail margin). Borrowing to bridge an extended lockup is possible but exposes you to forced-sale risk if the stock drops while the loan is outstanding. Review margin calls and lending structure carefully.
Consider charitable gifting
Most lockups permit gifts to trusts for the signer’s benefit or to public charities if the charity agrees to the remaining lockup. If your IPO year is your peak-income year, gifting appreciated shares to a donor-advised fund can produce a large deduction without requiring the shares to sell during the lockup.
Timing considerations for the extended period
Extensions are usually 30-90 days. If the extended expiration falls during a company blackout period (earnings window, material-event hold), your practical first-sale date is the first open trading window after the extended expiration.
Open-trading-window timing varies by company but typically runs for 3-4 weeks after each quarterly earnings release. A lockup that expires November 10 may not have its first open window until approximately mid-November post-earnings, depending on the company’s schedule.
Frequently asked
Can the underwriters release me early even if others are still locked?
In theory yes. The underwriters have discretion to waive the lockup for individual shareholders. In practice this almost never happens for rank-and-file employees. Waivers go to founders, executives with estate-planning rationales, and large strategic investors.
Do my unvested shares get locked?
Lockups apply to pre-IPO shares and shares issued upon exercise of pre-IPO options. RSUs that vest and settle after lockup expiration are usually free to trade. Check the specific language; some lockups bind all shares held by the signer regardless of when issued.
What if I leave the company before lockup expires?
The lockup agreement is with you personally, not with your employer. Leaving does not release you. You remain bound until the lockup expiration, plus any extensions.
Can I sell in a tender offer during lockup?
Most lockups prohibit all transfers, including tender-offer participation. A tender offer during lockup is unusual; the underwriters typically block company-run secondary transactions during this window.
What happens to secondary-platform orders during lockup?
Platform orders for locked-up shares cannot settle during the lockup. Some platforms accept conditional orders that settle at lockup expiration, but volume is minimal because buyers have limited visibility into when the lockup actually ends.
Next step
Pull your signed lockup agreement from your IPO documents package (usually emailed by the company’s outside counsel in the weeks before pricing). Note the expiration date, any automatic-extension language, any early-release triggers, and the governing law. Keep a calendar reminder 30 days before expiration to check for extension notices, and build your selling plan assuming the date could move by 30-90 days.
Sixteen years advising pre-IPO employees and founders through lock-ups, direct listings, and SPAC paths. Reviews VestedGrant's pre-IPO content.
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