Key Highlights

● The equal-weight S&P 500 rose nearly as much as the standard index on November 9.

● The S&P 500 jumped 173.08 points to close at 7,549.94.

● The gap between the two was a sliver.

● Rallies lately have often been driven by a few megacaps.

Most investors know the S&P 500 as a market-value-weighted index, where the biggest companies carry the most influence. There is also an equal-weight version that gives every member the same say, whether it is a trillion-dollar tech titan or a modest regional business.

On Monday, November 9, 2026, the two versions told almost the same story. The standard S&P 500 jumped 173.08 points to close at 7,549.94, its best day since April 8, and the equal-weight S&P 500 rose nearly as much, according to news reports. The gap between them was a sliver.

Why that is unusual lately

In recent years, rallies have often been powered by a small group of megacaps, leaving the equal-weight index trailing. When the two move in lockstep, it suggests buyers are spreading money broadly rather than piling into a few favourites.

Monday's breadth backed that up. Of the S&P 500's members, 423 rose and 78 fell, and 158 posted outsized gains, the most since August, reports said. All 11 sectors finished higher.

The Nvidia factor

One reason the cap-weighted index did not pull further ahead was Nvidia (NASDAQ:NVDA). The chipmaker, one of the largest companies in the index, slid to its lowest close since April 7, reports said, after its board opened an independent review involving CEO Jensen Huang. The board said it has "no reason to believe" national security or company secrets were compromised, according to market coverage.

Because Nvidia's weight in the standard index is so large, its decline acted as a brake on the headline number. In the equal-weight version, Nvidia counts no more than any other member, so its slide mattered far less. Market data figures showed the gain was broad rather than megacap-only, even with Nvidia down.

Other giants did rise. Microsoft (NASDAQ:MSFT) and Apple (NASDAQ:AAPL) gained with the market, and Tesla (NASDAQ:TSLA) climbed after news on its Cybertruck and Cybercab plans.

The mid-sized winners

The equal-weight index got a lift from strong moves in mid-sized S&P 500 members. Coherent (NYSE:COHR) and Monolithic Power Systems (NASDAQ:MPWR) were among the index's top performers, according to market reports. Bloom Energy (NYSE:BE) jumped after fuel-cell contract wins, while Seagate Technology (NASDAQ:STX) and Western Digital (NASDAQ:WDC) surged, reports said.

Airlines, which carry little weight in the cap-weighted index, rallied hard as oil slid. Delta Air Lines (NYSE:DAL), United Airlines (NASDAQ:UAL) and Southwest Airlines (NYSE:LUV) all surged, according to market data. In an equal-weight index, those moves count just as much as a megacap's.

The macro tailwind

The backdrop helped stocks of every size. Brent Crude tumbled to $92.57 a barrel, according to news reports, on hopes for a US-Iran peace deal, easing Inflation worries. The PHLX Semiconductor Index posted its best day since July 30, reports said. One market wrap said: "Stocks rebounded today, erasing some of last week's losses as dip buying and falling oil prices boosted sentiment."

Breadth Over Size

A healthy market often shows the average stock participating, so investors will watch whether the equal-weight index keeps pace in coming sessions. Tuesday's October consumer price index, the last before the Federal Reserve's December 8-9 meeting, is the next test; traders see a December hike as highly likely, according to market coverage.

Nvidia's Earnings on November 17 could swing the headline index far more than the equal-weight version. If Nvidia remains under pressure while the rest of the market holds up, the equal-weight index could continue to look relatively strong.