Lockup Period After IPO

A plain-English definition

A lockup period is a contractual restriction that prevents company insiders from selling their shares for a set time after an initial public offering, most commonly 90 to 180 days. It's an agreement between the company's pre-IPO shareholders and the investment banks underwriting the offering, written into the deal documents before the stock ever trades.

One detail that surprises many shareholders: the lockup is not a law. No statute requires it. It's a private contract, which is why terms vary from one IPO to the next. (Separate regulatory restrictions, such as SEC Rule 144 governing sales of restricted securities, can apply on top of a lockup, but the lockup itself is a negotiated agreement.)

Who is affected

Lockup agreements typically cover anyone who held equity before the company went public:

• Founders and executives, who usually hold the largest individual stakes
• Employees with vested stock options or restricted stock units
• Early investors, including venture capital and private equity funds
• Other pre-IPO shareholders, such as advisors or secondary buyers who acquired shares before the listing

Public investors who buy shares on the open market after the IPO are not subject to the lockup. The restriction applies to the pre-IPO cap table, not to the trading public.

Stabilizing the stock price after listing

An IPO typically releases only a small fraction of a company's total shares into the market. Insiders hold the rest. If all of those shares could be sold on day one, supply could swamp demand before the stock has established a trading history. The lockup staggers that supply, giving the market time to find a price based on the company's fundamentals rather than on a rush for the exits.

Building investor confidence

A lockup also sends a signal. When founders and early backers agree to hold their shares through the first several months of trading, new public investors can take some comfort that the people with the most information about the company aren't immediately cashing out. Underwriters insist on lockups for this reason. A new listing where insiders are selling from the opening bell is a hard story to market.

Standard duration

The conventional IPO lockup runs 180 days, roughly six months from the offering date. Some agreements are shorter, in the 90-day range, and a few extend longer. The exact term is disclosed in the company's IPO prospectus, so the expiration date is public information from the start.

Variations and exceptions

The single fixed expiration date is no longer universal. Common variations include:

• Staggered or phased releases. Shares unlock in tranches, for example 25% at 90 days and the remainder at 180, spreading the new supply over time.
• Price-conditioned early releases. Some agreements allow a portion of shares to unlock early if the stock trades above a set threshold for a defined period.
• Employee carve-outs. Companies sometimes negotiate earlier, limited windows for employees to sell a portion of their holdings, often to cover taxes on vested equity.
• Underwriter waivers. The underwriters can release shareholders from the lockup early, though this is uncommon and is typically disclosed when it happens.

Direct listings are a separate case: because there is no underwritten offering, many direct listings have no traditional lockup at all, which is one reason some late-stage companies have chosen that route.

Delayed liquidity

For insiders, the practical effect is simple: a paper gain they cannot touch. An employee whose equity is worth a meaningful sum at the IPO price has no ability to convert it to cash until the lockup expires, and the value of those shares can change substantially in the interim. Six months is a long time in a newly public stock.

Influence on the stock price

Lockup expirations are watched closely because they change the supply picture overnight. When a large block of insider shares becomes eligible for sale, the float can expand several times over. Share prices have sometimes declined in the days around an expiration; in other cases the date passes without much effect, particularly when the expiration has been well telegraphed and the shareholder base is committed for the long term.

Because expiration dates are disclosed in advance, markets generally anticipate them. The price impact, when it occurs, often reflects how much of the unlocked stock actually comes to market rather than the expiration itself.

Setting liquidity expectations before the IPO

Shareholders heading into an IPO generally benefit from knowing their lockup terms cold: when the restriction expires, whether the release is staggered, and whether any carve-outs apply to them. Employees with equity compensation often map the lockup calendar against vesting schedules and tax deadlines, and many consult a tax professional before the IPO rather than after, since decisions about exercising options can carry consequences that arrive on a different schedule than liquidity does.

Evaluating post-lockup conditions

When the lockup ends, the relevant questions are about market conditions: how the stock has traded since listing, how large the newly eligible share supply is relative to the existing float, and whether other shareholders appear to be selling. Trading windows, blackout periods tied to earnings, and company insider-trading policies can continue to restrict when employees and executives may sell even after the lockup expires, so the lockup expiration is often the first gate rather than the last.

The lockup question starts well before the IPO. For many shareholders in private companies, the wait for liquidity isn't six months; it's years of holding equity with no public market at all.

Augment operates a marketplace for private company shares, where eligible shareholders of late-stage private companies may be able to access liquidity, subject to company approval and applicable transfer restrictions. For accredited investors seeking exposure to pre-IPO companies, Augment Collective provides structured access to the same market from the buy side.

Because secondary transactions happen before a company goes public, they can offer shareholders a path to liquidity that doesn't depend on IPO timing or lockup expirations. Availability varies by company and by each issuer's transfer policies, and private market transactions carry their own eligibility requirements and risks. Augment's platform provides transparency into what's possible for a given company so shareholders can understand their options.

Lockups are a standard piece of IPO mechanics: a negotiated contract that delays insider selling so a newly public stock can find its footing. For public investors, the expiration date is a disclosed event worth understanding, since it changes the supply of shares available to trade. For insiders, the lockup is the last stretch of a much longer liquidity timeline, one that increasingly may include private market alternatives before the IPO ever happens. Shareholders who understand their lockup terms early, and the options available to them before and after listing, are in a far better position when the restriction finally lifts.