A stock delisted from the S&P 500 typically sees an immediate price drop as index funds sell their shares, followed by reduced trading volume and less attention from analysts and institutional investors. The company keeps operating, but its standing in the market changes fast.
Why Companies Fall Out of the Index
Removal from the S&P 500 happens in two distinct ways, and the distinction matters quite a bit for how investors should interpret the news. Voluntary delisting occurs when a company chooses its own exit: going private, getting absorbed in a merger, or deciding the cost of meeting index standards isn't worth it. Dell Technologies is the textbook case here. It went private in 2013, stepped away from public trading, and didn't return until 2018. It rejoined the S&P 500 itself on September 23, 2024, timed to its 40th anniversary as a company.
Involuntary removal is the more common path, and it's rarely good news. The S&P index committee drops a company when it no longer clears the bar on market capitalization, trading liquidity, or basic financial health. Whirlpool is a recent example. In 2024 its market cap slid below the threshold the index requires, and it got moved to the S&P MidCap 400 as a result. Persistent losses, looming bankruptcy risk, or failure to satisfy SEC and exchange rules can trigger the same outcome.
What Actually Happens to the Stock and the Shareholders
Here's the mechanical part: nobody takes your shares away, and you don't get cashed out. If you own stock in a company that gets dropped from the S&P 500, you still hold the exact same number of shares the next morning. What changes is the demand picture. Index funds and exchange traded funds that track the S&P 500 are essentially required to sell the stock once it exits, and that wave of selling tends to push the price down in the short run.
Beyond the initial price hit, a few other things tend to follow. Trading volume often thins out because the stock loses visibility with certain investor groups. Analyst coverage can shrink too, since some research desks focus attention on index constituents. And sentiment simply turns more skeptical: being dropped is widely read as a signal that a company's prospects have dimmed, fairly or not.
Longer term, institutional ownership tends to fall since many large funds are mandated to hold S&P 500 names specifically. That said, delisting isn't necessarily a death sentence. Some management teams treat it as a wake up call, using the moment to restructure operations or refocus strategy. A company can absolutely earn its way back into the index later, as Dell proved.
The Mirror Image: What Happens When a Stock Joins
Addition to the S&P 500 tends to produce the opposite reaction, and it's a genuinely exciting moment for a company and its shareholders. News coverage picks up, institutional interest grows, and index funds that track the S&P 500 are compelled to buy shares to match the new composition. That buying pressure frequently nudges the stock price higher in the days around the announcement.
Liquidity usually improves too, since trading volume tends to climb once a broader universe of funds and investors start including the stock in their portfolios. And there's a reputational lift that comes with inclusion: being part of the S&P 500 is widely viewed as a marker of scale and staying power in the U.S. equity market.
The Rules for Getting In, and Staying In
Membership in the S&P 500 isn't just about being one of the 500 largest companies by market value. There's a specific set of thresholds a company must satisfy, and an index committee that meets quarterly to weigh which firms to add or drop.
| Criterion | Requirement |
|---|---|
| Market capitalization | Unadjusted market cap of at least $18 billion |
| Public float | At least 10% of shares available to the public |
| Financial viability | Positive earnings over the most recent four quarters combined, and in the most recent quarter |
| Liquidity | Sufficient trading volume and a reasonable share price |
| Domicile | Must be a U.S. company |
| Public offering history | Must have gone public at least 12 months earlier |
| Sector balance | Should help maintain sector representation across the index |
Meeting these thresholds doesn't guarantee a spot. The committee has discretion, and it also weighs how index turnover and sector balance affect the S&P 500's role as a snapshot of the large cap U.S. equity market. Changes are usually announced a few days ahead of time, giving index funds a window to adjust their holdings before the switch takes effect.
Who Left and Who Arrived in 2024
The churn in 2024 offers a useful snapshot of both sides of this process. Whirlpool's exit followed a stretch of stock price weakness and shrinking market value; its corporate credit rating was cut to BBB minus, and shares touched a 52 week low shortly after the move.
American Airlines was dropped too, a reflection of lingering financial strain across the airline sector combined with the carrier's own high debt load and profitability that trailed its peers. The stock fell to multiyear lows in the aftermath, and the removal added to investor unease about the airline industry's turnaround prospects.
Etsy's removal told a different story: slowing post pandemic growth and intensifying competition from bigger ecommerce platforms raised questions about the durability of its business model. Its shares also sank to multiyear lows, and the company lost some of the institutional visibility that comes with index membership.
Other names dropped from the S&P 500 in 2024 included Zion Bancorp, Comerica, Pioneer Natural Resources, Bio-Rad Laboratories, and Illumina.
On the other side of the ledger, several companies earned their way in during 2024, including Palantir Technologies, Dell Technologies (on its return), KKR & Co., CrowdStrike Holdings, GoDaddy, GE Vernova, Deckers Outdoors, Super Micro Computer, Solventum, Vistra, and Erie Indemnity.
What Should Investors Do With a Delisted Stock?
If a company you own gets dropped from the S&P 500, the decision to hold or sell shouldn't hinge on the index headline alone. Look at the underlying fundamentals: earnings trends, debt levels, competitive position, and whether management has a credible plan. Selling triggers capital gains or losses with tax consequences, so that's worth weighing carefully too.
Investors who specifically track the S&P 500 through an index fund don't really have a choice in the matter. Their fund will sell the removed stock and buy its replacement automatically to stay aligned with the benchmark. For everyone else, reduced liquidity is the practical concern: unloading a large position in a stock that's lost some of its market visibility can be harder without moving the price.
Does Falling Out of the S&P 500 Mean a Company Is in Trouble for Good?
Not necessarily. The average company stays in the S&P 500 for roughly 21 years, which tells you turnover is a normal part of how the index stays current with the American economy. Dell's round trip, out in 2013, back in 2024, is proof that a delisting isn't automatically permanent or fatal. What matters most for anyone holding a dropped stock is separating the index news from the company's actual financial trajectory, and deciding from there whether the story still makes sense to own.