Imagine a company sells just a tiny slice of itself to the public during its IPO, while company insiders and early investors hold onto nearly everything else. That slice is called the "free float" - the shares actually available for regular people and institutions to buy and sell on the open market.
Lately, newly public companies have been keeping that slice unusually small. A new analysis from Nasdaq, written by Phil Mackintosh and Nicole Torskiy, found that 31% of companies going public this year have a free float below 30% of their total shares. Back in 2023, only 22% of IPOs were that tight-fisted with their stock.
The trend goes both ways. In 2023, 41% of new listings had a free float above 80%. This year, that number has dropped to 29%. Overall, the median free float for a 2025 IPO is 24% lower than it was just two years ago.
Why are companies holding back? There are a few reasons. Lock-up periods - typically 180 days after the IPO, and sometimes over two years for certain deals like de-SPACs or private-equity-backed listings - prevent shares from trading.
On top of that, some companies raise only a small amount of cash in the IPO, leaving founders and early backers with nearly all the stock. Index providers also treat shares held by governments, employee plans, large individual investors, and sovereign wealth funds as not part of the float, which can shrink the number even further.
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A low free float does more than just limit how many shares you can buy. It can also keep a stock out of the indexes that many investors rely on.
The Russell indexes, for example, require a minimum free float of just 5% for inclusion. MSCI indexes demand at least 15%. Even those low bars are not the main hurdle. The bigger issue is that most stocks already inside major indexes have free floats well above 80%.
Here is how the numbers shake out for the 90% free-float threshold - meaning the share of stocks in each index where at least 90% of shares are tradable:
For smaller stocks outside the Russell 2000, the picture is even tougher. Only 19% of equities that are outside all three major indexes boast a free float greater than 90%. That can affect index eligibility for those stocks.
The shrinking free float among new IPOs is not just a curiosity for data nerds. It has real consequences for how stocks trade and which companies end up in your index funds.
Only 24% of 2025 IPOs have landed in the Russell 3000 index so far, down from 32% for 2024 listings. That means fewer newly public companies are getting the kind of steady, long-term buying pressure that comes from index investors. Those investors - think pension funds, mutual funds, and ETFs - tend to be patient holders.
Still, low-float stocks do not necessarily become more volatile in terms of how fast shares change hands. Most stocks in indexes trade between 1 and 5 times their entire float each year. For stocks outside indexes, the range swings much wider - from as little as 0.1 times to over 5,000 times per year. Investors appear to adjust the volume of their purchases and trades based on the number of shares that are freely tradable.
The takeaway: When a company goes public with only a sliver of its stock available, it is worth paying attention. That stock may not qualify for the indexes. For your portfolio, that is one more thing to watch the next time a hot IPO hits the headlines.
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