IPO Lockup Expirations: What Happens When Insider Shares Unlock in 2026
October 14, 2026
14 min read
An IPO lockup expiration is the date when a newly public company's insiders and early investors are first allowed to sell the shares they held before the offering. For months after an IPO, only a slice of the company actually trades. On the lockup expiration date, many more shares can.
That date is public, and traders know it. The common shorthand is that a stock "always drops into the lockup," and some do. Others have already fallen by then, some barely move, and a few rise on the day because everyone who expected selling was positioned for it. Traders who treat the date as a guaranteed short often learn this the expensive way.
In this guide we'll cover what an IPO lockup expiration is, why it can pressure a stock's price, how to find the date and the number of shares involved, how a day trader can approach the days around it, and how lockup expirations fit inside a simulated funded stock account.
Key Takeaways
- Treat the date as a supply event, not a price prediction. A lockup expiration lets insiders sell. It does not require them to.
- Read the prospectus, not the headline. The terms, the date and the number of shares are disclosed in the company's IPO filing.
- Measure the unlock against the tradable float. Ten million shares matters far more to a stock with twenty million trading than to one with two hundred million.
- Expect the market to move before the date. A known event is often priced in the weeks ahead of it, which can leave little on the day itself.
- Size for the gap, not the thesis. Heavy volume and news around an unlock can move a stock quickly in either direction.
Table of Contents
- What is an IPO lockup expiration?
- Why can a stock fall around an IPO lockup expiration?
- How do you find a lockup expiration date and its size?
- How should a day trader approach an IPO lockup expiration?
- IPO lockup expirations in a simulated funded stock account
What is an IPO lockup expiration?
An IPO lockup expiration is the end of an agreement that kept a company's insiders and large pre-IPO shareholders from selling for a set period after the offering. The period is most often 180 days. When it ends, those holders can sell their shares in the public market, subject to any other securities-law limits that still apply to them.
What a lockup agreement is
Investor.gov's page on IPO lockup agreements describes them as agreements that prohibit company insiders (employees, their friends and family, and large shareholders) from selling their shares for a set period of time after an IPO. The company's insiders and its underwriter typically sign the agreement before the company goes public, so that those shares do not reach the public market too soon after the offering.
The same page says terms vary, "but most prevent insiders from selling their shares for 180 days." It adds that lockups may also limit how many shares can be sold over a designated period, which is why some unlocks happen in stages rather than all at once.
Why only part of a new company trades
When a company goes public, it usually sells a fraction of its shares to the public. The rest stay with founders, employees and early investors. The SEC's investor bulletin on investing in an IPO explains that those holders often cannot sell soon after the IPO, either because their shares are restricted securities under federal law or because they signed a lockup, "typically 180 days."
The bulletin's point is that this limited supply shapes how a new stock trades. With fewer shares available, a popular IPO can be driven "steeply up because of the limited supply to meet the high demand." The lockup expiration is the scheduled moment when that limit starts to loosen. Our guide to day trading recent IPOs covers the earlier part of this timeline, from the first print through the first few months.
Why can a stock fall around an IPO lockup expiration?
A stock can fall around an IPO lockup expiration because the number of shares that are allowed to trade can jump on a single date, and because many early holders see the public market as their way to sell. Even the expectation of that selling can push the price down before any insider actually sells. Whether it does depends on how many shares unlock, how many holders want out and how much was already priced in.
The overhang
The SEC bulletin calls the shares that are outstanding but cannot yet trade the "market overhang." It says the share price after an IPO "may decline over time as shares that were previously restricted become available for sale," and that when lockups expire, "the share price may decline significantly if a large number of shares become available for sale all at once."
It also names the motive. Early investors "often view an IPO as an exit strategy," and the lockup expiration gives them the chance to sell to the extent they could not sell in the IPO itself. A venture fund that has held a stake for years may have its own reasons to sell, regardless of what it thinks of the company's next quarter.
The market does not wait for the date
Investor.gov's lockup page adds a detail that matters for timing: a company's stock price "may drop in anticipation that locked up shares will be sold into the market when the lockup ends." Because the date is in the public filing, traders can position for it weeks ahead. Some sell early to get ahead of insiders. Some sell short.
That can leave the expiration day itself surprisingly quiet, or even produce a bounce, if the selling that was expected never arrives in size. The supply is a fact. The price effect is a probability, and part of it may already be spent by the time the date comes.
A worked example of the float change
Here is an illustrative example. A company sells 30 million shares in its IPO and has 150 million shares outstanding. For 180 days, the 120 million shares held by insiders and early investors are locked up, so about 30 million shares make up the tradable supply. On the day the lockup ends, up to 150 million shares are eligible to trade, five times as many as the day before.
"Eligible" is the key word. If holders of 10 million shares sell over the next month, the effect is very different from holders of 60 million selling in a week. Our guide to float and liquidity explains why the size of the tradable float shapes how far a stock moves on a given amount of buying or selling.
Illustrative example
The float before and after the lockup
An invented company sells 30 million shares in its IPO and has 150 million shares outstanding. The other 120 million are locked for 180 days.
Shares outstanding: 150 million
- Sold in the IPO, trading
- Held by insiders and early investors
Eligible to sell is not the same as will be sold. How many holders sell, and how fast, decides the price effect.
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Illustrative example. Invented company and share counts. Real lockup terms vary and are disclosed in each prospectus. Not a prediction and not a recommendation.
How do you find a lockup expiration date and its size?
You find a lockup expiration date and its size in the company's IPO prospectus, which describes the lockup terms and the shares that will become available for sale. The prospectus is filed with the SEC and searchable through its EDGAR database. Count forward from the date in the prospectus, then compare the number of locked shares with the shares that already trade.
Where it is written down
Investor.gov says U.S. securities laws require a company with a lockup "to disclose the terms in its registration documents, including its prospectus," and tells investors to review the IPO prospectus, which can be found online through the SEC's EDGAR database. The SEC bulletin is more specific: the discussion of shares that can be sold after the IPO "can typically be found under Shares Eligible for Future Sale or a similar caption."
That section is the one to read. It usually sets out how many shares are covered, when the restriction ends and whether different groups of holders unlock at different times. Financial news calendars often list lockup dates too, but they are summaries. When the summary and the filing disagree, the filing wins.
Staged and early releases
Not every lockup ends in one step. As investor.gov notes, some limit how many shares can be sold over a period, and some agreements release shares in stages or allow an early release under conditions written into the agreement. The underwriter can also agree to release holders early. Any of these can move the effective date away from day 180.
So treat a calendar date as a starting point. Check the prospectus for staged terms, and check the company's later filings and announcements for any change before you plan around a single day.
The numbers that matter
Two figures are worth writing down before the date. The first is the number of shares that unlock, as a multiple of the shares that already trade. The second is the stock's average daily volume. An unlock equal to 30 days of average volume is a different situation from one equal to two days of it.
Ownership matters as well. A large stake held by a venture fund near the end of its life is more likely to be sold than founder shares held by people who still run the company. You will not know anyone's intentions, but the prospectus tells you who holds what.
| What changes | Before the lockup expires | After the lockup expires |
|---|---|---|
| Who can sell in the market | Mainly the public buyers from the IPO | Also insiders and early investors whose lockup has ended |
| Shares able to trade | Roughly the shares sold in the IPO | Up to the full unlocked amount, often several times larger |
| Where the terms are found | The prospectus, under Shares Eligible for Future Sale | The same section, plus any later release or change |
| What traders are pricing | The chance of insider selling to come | How much selling actually arrives, and how fast |
| What a day trader should watch | Drift into the date, rising short interest, news | Opening gap, volume against average, the reaction at levels |
How the trading picture of a recent IPO changes when a lockup ends. Terms vary by company and are disclosed in each prospectus.
How should a day trader approach an IPO lockup expiration?
A day trader should approach an IPO lockup expiration as a known event with an unknown outcome: plan the levels in advance, expect more volume and a wider range than usual, and let the stock's actual reaction decide the trade. The worst approach is a fixed bet that the stock must fall, sized as if the date guarantees it.
Do the work before the date
Mark the expiration date and the share count in your notes a week ahead. Watch how the stock trades into it. A steady slide on rising volume suggests traders are positioning early. A stock that holds its levels while the date approaches is telling you the expected selling may already be absorbed, or that buyers are waiting for it.
Look at the levels that matter on the daily chart: the IPO price, the first-day high and low, and any range the stock has held in recent weeks. The IPO price often draws attention, because it is the price the original buyers paid. None of these levels is a guarantee. They are places where you can decide in advance what a break or a hold would mean.
Read the open, not the forecast
On the day, the question is what the stock does, not what it was supposed to do. Compare the opening volume with the stock's average. Watch whether a gap down keeps going below the first fifteen minutes' range or gets bought back. A stock that gaps down and reclaims the prior day's close is showing you that sellers did not have the room to themselves.
A crowded short can also reverse quickly. If many traders sold short ahead of the date and the selling never comes in size, their buying to close can lift the stock. The date is the same for everyone. The edge, if there is one, is in reading the reaction.
Size for the range you are likely to see
Recent IPOs already move fast, and a lockup expiration can add news and volume on top. Set your stop from a level that would prove you wrong, measure that distance and size so the loss at that stop fits your plan. A wider expected range means fewer shares for the same dollar risk, not a wider stop with the same share count.
Many unlocks also coincide with other events. Some companies report earnings close to the six-month mark, and insiders may sell through a registered offering instead of on the open market. Our guide to secondary offerings and dilution covers how a large share sale can reach the tape.
- Confirm the date and terms in the prospectus, under Shares Eligible for Future Sale.
- Check for staged releases, early-release terms or any later change.
- Write down the shares unlocking as a multiple of the shares that already trade.
- Compare that number with the stock's average daily volume.
- Mark the IPO price, the first-day range and recent support and resistance.
- Note whether earnings or an offering fall near the same date.
- Set the stop from a level, then size the shares so the loss fits your daily limit.
IPO lockup expirations in a simulated funded stock account
In a simulated funded stock account, a lockup expiration is a live-market event you can trade around, but the agreement, the insider sales and the share transfers all happen in the real market, not in your account. What governs you is the account's written rules: the symbol list, the trading hours, the short-selling terms, the daily loss limit and the maximum drawdown.
What the account sets
TradeFundrr's stock accounts, Pre-Prop (a simulated evaluation account) and Prop, list $100,000 of buying power, a $1,000 daily loss limit that pauses trading for the rest of the session when it is reached, and a $3,000 maximum drawdown that trails the highest end-of-day balance and closes the account when it is reached. Trading runs from 4:00 a.m. to 4:00 p.m. ET with premarket available, manual and intraday only, with no swing positions and a 15-second minimum hold.
Two rules matter here in particular. First, no swing positions means you cannot short a stock days ahead of its lockup and hold into the date. Any trade has to work inside a single session. Second, short selling is limited to easy-to-borrow availability. A recent IPO with a crowded short interest may not be easy to borrow, so a short you planned may not be available on the day.
What is live and what is simulated
A lockup is a contract between real shareholders and an underwriter. Its expiration lets real holders deliver real shares into the market. None of that happens inside a simulated account, because no real trade is executed there: your orders do not add to the supply, and a short in the sim does not require a real borrow of real shares from a real lender.
What you do get is the price action. The quotes, the volume and the gap on the morning of an unlock come from the real market. Learning to plan around a known supply event, read the opening reaction and size for a wider range is a live-ready skill, and the simulated account is a place to practice it against the same limits every day.
The honest limit of this idea
This is not for everyone. Recent IPOs can gap, halt and reverse sharply, and a lockup expiration can make that worse. Most of the information you need is public, and so is everyone else's interpretation of it. There is no secret in the date.
Understanding IPO lockup expirations will not guarantee a profitable trade, a passed evaluation or a payout. It tells you when supply can change and how much, so you can plan for the day instead of being surprised by it, and so the size of your position reflects the range you are likely to see.
Frequently Asked Questions
When do IPO lockups expire?
Most IPO lockups expire 180 days after the offering, but the terms vary by company. Some release shares in stages or allow early release under set conditions. The exact terms are disclosed in the company's IPO prospectus, usually under Shares Eligible for Future Sale.
Does a stock always drop when the lockup expires?
No. Investor.gov notes that a stock's price may drop in anticipation of insider selling, which means some of the move can happen before the date. Whether the price falls on or after the date depends on how many holders actually sell and how much was already priced in.
How do I find a company's lockup expiration date?
Read the company's IPO prospectus, which is filed with the SEC and available through its EDGAR database. The section on shares eligible for future sale sets out the lockup period and the number of shares covered. Count forward from the offering date and check later filings for changes.
Who is covered by an IPO lockup agreement?
Typically company insiders, including employees, their friends and family, and large pre-IPO shareholders such as venture investors. The company and its underwriter set the terms before the IPO. Shares sold to the public in the offering are generally not locked up.
Can I trade a stock on its lockup expiration day in a TradeFundrr stock account?
Yes, if the stock is on the platform's symbol list, within the account rules. Trading runs from 4:00 a.m. to 4:00 p.m. ET, intraday only, with no swing positions, so you cannot carry a position into the date from the day before. Confirm the symbol with support first.
Can I short a stock ahead of its lockup expiration in a funded account?
Only intraday, and only if the stock is easy to borrow. TradeFundrr's stock accounts limit short selling to easy-to-borrow availability, and recent IPOs with heavy short interest may not qualify. With no swing positions allowed, a short cannot be held overnight into the date.
Do insider share sales happen inside a simulated funded account?
No. Lockup expirations and insider sales are live-market events involving real shareholders and real share transfers. No real trade is executed in a simulated account. You trade against real market quotes, and your result comes from your own entry and exit prices.
An IPO lockup expiration is a date when supply can change, not a date when price must change. The filing tells you how much can be sold. Only the market tells you how much is.
Do the reading before the date, let the stock's reaction decide the trade, and size for the range the day is likely to bring.
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TradeFundrr's Pre-Prop and Prop stock accounts state the drawdown and loss terms up front, so every position is sized against the same limits.
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