"I Know What You Did Last Summer"was a suspenseful horror hit in the late '90s. Millennials may remember the movie and its sequel starring Jennifer Love Hewitt and Freddie Prinze Jr. The story follows four teenagers involved in a hit-and-run accident and a killer seeking revenge for an apparent murder the teens committed. A year after the accident, the teens begin receiving ominous messages from the mysterious killer.

• Warning! GuruFocus has detected 3 Warning Signs with CMG.

Today's stock market has a bit of that same feel. Recall it was last summer when the S&P 500 was in the throes of a correction. Equities peaked in late July during the heart of the second-quarter earnings season and would go on to bottom the following October. The pullback was nearly as textbook as it could get considering that U.S. large caps dipped 10% over the course of three months before resuming a broader uptrend.

Troubling headlines in early August

Investors are now receiving ominous messages and reminders about volatility. Last week, the VIX Index soared above 65 for a moment following a turbulent weekend of bearish news that included confirmation of a large sell of Apple (NASDAQ:AAPL) stock by Berkshire Hathaway (NYSE:BRK.A),[1] reports of a delay in Nvidia's (NASDAQ:NVDA) new Blackwell chips,[2] turmoil in the Japanese stock market and its yen carry trade unwind[3] and the potential for war in the Middle East.[4] All of that followed a disappointing U.S. jobs report after the Federal Reserve decided to put off its first rate cut, likely until September.[5]

While the reasons may be much different from this time in 2023, investors likely feel as if the bears are stalking them for past misgivings as we venture further into a historically weak period on the calendar. And we see selling pressure among a handful of once-hot individual stocks that announced splits earlier this year.

The appeal of stock splits

The media often discuss stock splits in a positive light. After all, the reason a management team elects to divide its existing shares into multiple shares is commonly as a result of a previous run-up in the stock. A traditional split can increase trading liquidity, and it may have certain psychological benefits as investors may perceive a lower-priced stock as more accessible, even if the company's fundamental value hasn't changed. Stock splits can even be implemented to make shares more affordable for employees in certain stock-based compensation plans.

More splitters

Traditional stock splits were back in vogue last quarter. Second-quarter 2024 featured 29 split announcements the highest in three years. It's not surprising considering that markets were in rally mode, led by strength in U.S. large caps. The third quarter is already tracking well with 10 split announcements as of Aug. 7.

Second quarter marked a three-year high in traditional stock-split announcements

Source: Wall Street Horizon

Digging into the anomaly

Research shows that stocks that split tend to beat their primary index, but the alpha trend has waned over the years as the anomaly has become more widely understood. BofA Global Research reports that since 2010, stocks that have split have posted a 12-month forward return five percentage points above the index. While that's strong, it's far short of the 10-percentage-point-plus positive gap seen in previous decades.

Stocks that split have historically outperformed

Source: BofA Global Research

More recent figures from Goldman Sachs, using FactSet data, reveal that in the past five years, the stock-split halo has been even less powerful. Average excess returns among splitters are essentially flat in the following week, month and three-month periods.

The stock split announcement effect has disappeared recently

Source: Goldman Sachs

A changing market

Why aren't we seeing the outperformance of yesteryear? Well, information is more easily available today and the advent of fractional-share trading along with markets that are perhaps more efficient at least partially negates the halo effect of a stock split. There are also fewer splits as higher share prices are now accepted, and many large companies are not as concerned about needing to appeal to retail investors due to large institutional shareholder bases.

Stock-split stars hit the skids

Turning to recent market action, let's follow four of this year's highest-profile stock splitters. Chipotle (NYSE:CMG), NVDA, MicroStrategy (NASDAQ:MSTR), and Super Micro Computer (NASDAQ:SMCI) each announced splits, the first being Chipotle back on March 19. Nvidia followed with a 10:1 on May 22, then came MicroStrategy's 10:1 on July 11 and Super Micro joined the party on Aug. 8.

Through last Wednesday, all of those stocks were mired in steep drawdowns. Notice in the graph below that the best performer was Chipotle down 22% from its mid-June peak. Nvidia was the poster child for the artificial intelligence-fueled bull market from late 2022 through the first half of 2024, but the mega-cap is now well into bear-market territory. MicroStrategy, often included in the same conversation as crypto, tested its March peak last month, but has since plunged more than 30%. Super Micro, another AI play, reacted harshly after its quarterly earnings report and stock-split announcement on Aug. 6.

2024 drawdowns: CMG, NVDA, MSTR, SMCI down sharply from year-to-date highs despite split announcements

Source: Koyfin Charts

The bottom line

There's a feeling of deja vu in markets today. The S&P 500 fell about 10% from late July through early fourth quarter last year, and that followed downside price action over a similar stretch in 2022. This year, the bears have asserted themselves after the bulls controlled the first half. Shares of companies that recently announced stock splits are well off their highs, generally not benefiting from the historical trend of outperformance.

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1 Warren Buffett (Trades, Portfolio)'s Berkshire Hathaway Slashes Apple Stake, The Wall Street Journal, Karen Langley, August 3, 2024, https://www.wsj.com2 Nvidia Investors Grapple With Delay to Next Generation AI Chip, The Wall Street Journal, Tom Dotan, August 5, 2024, https://www.wsj.com3 Why the Yen Carry Trade Unwind Has Further to Go, The Wall Street Journal, Chelsey Dulaney, August 5, 2024, https://www.wsj.com4 Mideast Braces for More Violence Amid Warnings of Iranian Attack, The Wall Street Journal, Laurence Norman, Benjamin Katz, Feliz Soloman, August 5, 2024, https://www.wsj.com5 Market Selloff Upends Fed Rate-Cut Calculus, The Wall Street Journal, Nick Timiraos, August 5, 2024, https://www.wsj.com

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This article first appeared on GuruFocus.