Apple added $164 billion to the S&P 500 today. Six chipmakers lost $284 billion

Apple gained $163.9 billion in market value in the S&P 500 on Thursday, September 10, closing up 3.56% at $326.57. That was the single largest dollar move of any stock in the index that day, in either direction — bigger than $NVDA's $128.2 billion loss, the largest decline.

It still wasn't enough to turn Technology green. The sector closed the day down 0.95% market-cap weighted, a net loss of $281.2 billion, because six of Apple's own sector-mates had a far worse day than Apple's was good: $NVDA (-2.37%, -$128.2B), $MU (-4.90%, -$56.9B), $INTC (-5.57%, -$31.3B), $AMD (-3.36%, -$28.6B), $LRCX (-5.65%, -$22.3B) and $AVGO (-0.97%, -$16.9B) lost a combined $284.1 billion — nearly twice what Apple added.

Take Apple out of Technology altogether and the sector's other 75 constituents lost $445.0 billion between them, a cap-weighted decline of 1.91% — roughly double the 0.95% the sector actually posted. Apple's rally was doing real work; it just wasn't the sector's story.

It was the story of chips specifically. Yahoo Finance and 24/7 Wall St. both framed the day around one contrast: "Skyworks Solutions Surges 10%, Qorvo Climbs 6% While Chip Stocks Fall," tying the pair's rally to optimism that their long-pending merger is finally clearing antitrust review. On the site's own numbers, $SWKS closed up 9.79% and added $1.13 billion — a fraction of what the sector's decliners erased, but a clean exception to the day's pattern, and one with its own specific cause rather than the broader pressure hitting the rest of the group. Micron's drop got its own separate explanation: StocksToTrade reported "MU Stock Slides As Legal Fight And Chip Selloff Rattle Traders," describing legal exposure on top of the sector-wide selling that also took Intel, AMD, Lam Research and Broadcom lower.

The index's biggest single moves

Apple's gain and Nvidia's loss were not close to being matched by anything else in the S&P 500 that day. Ranked by dollar change, market-cap weighted:

Micron's move stands out for size relative to the rest of the list: a 4.90% decline erased $56.9 billion, more than double what Alphabet ($GOOGL, +0.59%, +$23.9B) added on a much smaller percentage move, because Micron itself carries a market cap over $1.1 trillion. Oracle ($ORCL, -5.38%, -$25.0B) and Meta ($META, -1.42%, -$23.7B) round out the sector's other large decliners, neither tied by today's coverage to the same merger-and-legal-overhang narrative driving Micron and Skyworks — their declines are part of the broader move but don't have a single named cause in today's reporting.

Where the rest of the index stood

Technology's decline didn't sink the S&P 500 alone — selling was broad. Only two of the index's eleven sectors closed higher:

Across all 500 constituents, the index closed down 0.57% cap-weighted, a net market-cap loss of $423.1 billion. That's in line with what 24/7 Wall St. reported for the session: the S&P 500 closed down roughly 0.6% as "all three major indexes slip red."

The day is a reminder that a single mega-cap's record-setting gain and a sector's direction are two different measurements. Apple's $163.9 billion was real, and larger than any other single move in the index that day. It was also smaller than what six chipmakers lost between them — which is the number that actually decided which way Technology closed.

Figures are drawn from the site's own market-cap snapshot for the September 10, 2026 session, market-cap weighted across each sector's constituents with a change reading.