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The S&P 500 inclusion effect springboard is back in a big way

That temporary price bump had cooled throughout the 2010s — now it’s heating up again, per a new Goldman Sachs report.

Hyunsoo Rim

It’s not unusual to see shares pop when a company is set to join the S&P 500, an index now linked to a staggering $20 trillion in global assets. Just last Friday, Block soared 10% after its inclusion was announced, while Datadog spiked 15% on similar news earlier this month. 

Known as the “S&P 500 Index Effect,” this short-lived bump is fueled in part by fresh demand from $13 trillion worth of passive funds and ETFs tracking the benchmark, which are required to buy shares of newly added companies.

But over the past decade, this effect had been losing steam. According to a 2023 Harvard study, the average announcement day return for S&P 500 additions dropped from 9.4% in the 1990s to just 0.8% by the late 2010s — partially because markets got better at absorbing these shocks, and traders got better at predicting inclusions.

Now, though, a new Goldman Sachs analysis suggests the inclusion effect may be staging a comeback.

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Since 2021, stocks newly added to the S&P 500 have outperformed the equal-weighted index by an average of 4 percentage points on the announcement day — with nearly three-quarters of those stocks beating the benchmark.

Source matters

One factor driving the revival is that fewer companies are migrating from the S&P MidCap 400 Index. Per Goldman’s estimate, stocks added from outside the S&P 400 have seen average relative gains of 5.3 pp since 2013, while those graduating from the midcap index actually dipped 0.4 pp.

Retail hype may also be adding fuel, with recent entrants like Coinbase, Super Micro Computer, Palantir, and Datadog already beloved by traders ahead of their debut — and tied to popular themes like AI or crypto

So, which big names could be next in line for America’s flagship index?

Go Deeper: Datadog is now in the S&P 500. These big stocks still aren’t.

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Report: Boeing could unveil 500-jet order from China during Trump’s visit later this month

Shares of Boeing are up nearly 4% on Friday afternoon, following a Bloomberg report that the company could be close to finalizing a deal to sell 500 planes to China.

The deal was first reported in August and would be one of Boeing’s largest ever.

According to Bloomberg’s sources, the deal could be officially unveiled when President Trump travels to China at the end of the month. That trip could be delayed given the war in Iran. The deal, sources say, could still fall apart — similar language to when it was first reported on more than six months ago.

Boeing has been on the outside of the Chinese market, in terms of new orders, since 2019 amid escalating US-China trade tensions.

According to Bloomberg’s sources, the deal could be officially unveiled when President Trump travels to China at the end of the month. That trip could be delayed given the war in Iran. The deal, sources say, could still fall apart — similar language to when it was first reported on more than six months ago.

Boeing has been on the outside of the Chinese market, in terms of new orders, since 2019 amid escalating US-China trade tensions.

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Why software shares are withstanding the war jitters

The outbreak of the war in Iran has clearly rattled investors and created a few clear winners — mostly energy stocks — and losers — consumer staples, airlines, and, well, more or else everything else.

But there is one interesting outlier to that Manichaean market dynamic.

Software shares — often the same companies that the market was giving up for dead just a few weeks ago due to overexpectations of an AI-driven disruption — have been holding up remarkably well.

These companies, including Intuit, ServiceNow, Datadog, Snowflake, IBM, Workday, and Oracle, have actually had a pretty decent run since the war started with a combined US-Israeli attack on Iran last weekend.

A new note from RBC Capital’s Rishi Jaluria suggests this isn’t just a fluke. Looking at the performance of software stocks during periods of geopolitical stress and market volatility over the last 10 and 25 years, his team found that software shares appear fairly well insulated when these broader shocks hit. RBC wrote:

“The defensive nature of SaaS models and the mission-critical nature of many core software systems at the enterprise level (e.g., in the absence of mass layoffs that may create seat-based headwinds, geopolitical uncertainty and/or market volatility typically will not cause an enterprise CIO to consider ripping out their ERP, CRM, Cyber systems, etc.”

I briefly got Jaluria on the phone yesterday, and he explained a bit more about why he thinks investors might see software as a decent place to hide out from the current chaos.

“With everything in the Middle East, you have to think about not just oil and gas input prices but also supply chains,” he said. “With software, you’re not really thinking about that.”

In other words, there is no equivalent of a closure of the Strait of Hormuz that software investors have to worry about.

Others suggested that the near-term profitability of these giant software companies — aside from concerns about potential long-term disruption from AI — may look different in the face of the economic uncertainty that seems to be growing with the war, especially after a sell-off that has left them relatively attractively valued.

Mark Moerdler, who covers software stocks for Bernstein Research, says that while the AI worries are clearly real, software companies continue to be highly productive cash cows.

“Everyone is afraid that AI is a massive disruptor, and all these articles you read talk about AI as massive disruptor or the world is ending or whatever,” he said. “You don’t see it in the fundamental numbers of the companies I cover. They are delivering GAAP profits, free cash flow, and they’re good investment ideas.”

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