What is an IPO pop? Definition, how it works and examples
The gap between the price a company sells at and the price its shares first trade at — why it is there, who is allocated it, and what it says about the pricing.
The short answer
The IPO pop meaning, in one line: an IPO pop is the rise from a new listing’s offer price to its closing price on the first day of trading, measured as (first close − offer price) ÷ offer price. A share sold at $20 that closes at $26 has popped 30% — the market paid that much more than the company accepted. For a private-company investor or employee, the pop is not a gain. It goes to whoever was allocated shares at the offer price, mostly institutions.
What is an IPO pop, and how is it measured?
The standard measure is the first-day return: the first closing price against the offer price. It ignores the opening print, which is often higher or lower than the close, and it ignores the over-allotment shares. Academic series and the trade press use the close because it is the first price at which the whole market has had a day to trade. Two averages are quoted, and they tell different stories. The mean is pulled up by a few very large pops; the median is the typical deal. In 2025 the mean was 29.3% and the median 13.7%.
Why are IPOs underpriced?
A pop is the visible result of underpricing: the offer price was set below what the market would pay. The SEC states the trade-off plainly — underpricing “creates a discount for the initial investors, increases the demand for the IPO and helps the underwriters sell all of the available shares”. Research offers three groups of explanations, and none of them is complete. Information asymmetry Some investors know more about the company than others.
An IPO pop, worked through — and who pays for it
A company with 90,000,000 shares sells 10,000,000 new ones at $20 to raise $200M. The shares close the first day at $26. Follow the money. The table is the whole argument. The company raised what it needed either way; the difference is how many shares it gave for it. At $20 the existing holders kept 90.0% of the company; at a full price they would have kept 92.1%. Each pre-IPO holder — founder, employee, fund, or a vehicle holding a block — owns a slightly smaller piece, so that the first buyers could own a slightly cheaper one. How that works on a cap table is on dilution.
Do IPOs tend to go up?
On the first day, usually — but not reliably. Since 1980, 16.5% of US IPOs closed below the offer price and 13.0% closed exactly at it. In 2025 almost a quarter, 24.4%, closed below. A pop is the most common outcome, not a certain one. After the first day the picture turns. Ritter tracks every US IPO from 1980 to 2024 for three years. Bought at the offer price, the average three-year return was 36.3%, or 3.3 points behind the market. Bought at the first close — the price most people can actually pay — it was 19.1%, or 20.5 points behind.
What an IPO pop means for employees and pre-IPO investors
You cannot sell into it Existing holders are usually bound by a lock-up. The price that matters for your exit is the one on the lock-up expiration date, months later. It dilutes you As the example shows, a pop is paid for in extra shares issued to raise the same money. It can raise a tax bill before you can sell RSUs that settle at the listing are taxed on their value on the settlement date the plan sets, not on what you later sell for. See RSU taxes. It flatters the paper value A first-day close is one day’s price on a small float, before the locked-up shares can trade.
The rules around a first-day pop, as of October 2026
Common mistakes Reading the pop as the stock’s return It is the return from a price most buyers were never offered. Chasing it at the open From the first close, the average IPO trailed the market by 20.5 points over three years. Treating a pop as the company’s success For the issuer it is money not raised; for pre-IPO holders, extra dilution. Counting paper value on listing day Locked-up shares cannot be sold at that price, and the float is small. Assuming every IPO pops About one in six since 1980 closed below the offer, and almost one in four in 2025.
The terms this page uses
First-day return The first closing price minus the offer price, divided by the offer price. The standard measure of an IPO pop. Offer price The price at which shares are sold in the IPO, set by the company on the underwriters’ recommendation. Underpricing Setting the offer price below what the market will pay. The pop is its visible result. Money left on the table First-day close minus offer price, times the shares offered — what the sellers forwent. Allocation The underwriters’ decision on who receives shares at the offer price, and how many.
What people ask about IPO pops
What is IPO pop, in plain words? It is how much a new stock rises on its first day, from the price the company sold it at to the price it closes at. A 30% pop means the market valued the shares 30% above the offer price by the end of that day. Do IPOs tend to go up after the first day? Not relative to the market, on average. Measured from the first close, US IPOs from 1980 to 2024 returned 19.1% over three years, 20.5 points less than the market. Most of the outperformance an average IPO delivers is the pop itself. Why would a company accept a pop?
What is IPO pop, in plain words?
It is how much a new stock rises on its first day, from the price the company sold it at to the price it closes at. A 30% pop means the market valued the shares 30% above the offer price by the end of that day.
Do IPOs tend to go up after the first day?
Not relative to the market, on average. Measured from the first close, US IPOs from 1980 to 2024 returned 19.1% over three years, 20.5 points less than the market. Most of the outperformance an average IPO delivers is the pop itself.
Why would a company accept a pop?
Partly to make sure every share sells, partly because informed investors are rewarded for revealing demand, and partly because the banks running the deal also serve the buyers. The SEC notes the company “may be unsatisfied” with a large bump — it could have raised more.
Can I buy at the offer price and capture the pop?
Only if an underwriter allocates you shares, and most go to institutional and high-net-worth clients. Most individuals buy after trading opens, at a price that already includes the pop.
Does a pop help my pre-IPO shares?
It raises their paper value for a day you cannot sell on. It also dilutes you, because the company issued more shares to raise the same money. What counts is the price when your lock-up ends.
Is there a pop in a direct listing?
Not in the same sense: there is no offer price, only a reference price and an opening auction. The first trade is set by the market, so there is no allocation at a fixed price to be underpriced.
Where every figure on this page comes from
Figures were last verified on 2 October 2026. All first-day and long-run statistics are Jay Ritter’s, from the version of 25 September 2026, which counts US operating companies with an offer price of at least $5 and excludes SPACs, funds and ADRs. Rules are cited for the United States.