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July 24, 2026 · week in review

Alphabet's Slide and a Split AI Trade Send the Index Lower Even as Breadth Holds Up

The S&P 500 slipped for a second straight week as Alphabet, Tesla and Amazon did the damage while chipmakers and industrials quietly held the average stock in positive territory.

The S&P 500 closed the week at 7,411.98, down 45.71 points, or 0.61%, from July 17 to July 24. The index fell, but the average stock did not: 262 of 503 members finished the week higher, and the equal-weight version of the index actually gained 0.13%. That is a clean divergence, a handful of large names pulling the cap-weighted number down while breadth underneath stayed constructive.

The S&P 500 through the session

The drag was concentrated in a familiar group. Tesla alone cost the index 23.31 points on a 17.81% decline, the single largest detractor. Alphabet's two share classes together, GOOGL at negative 17.86 points and GOOG at negative 14.43 points, removed 32.29 points combined, more than any individual stock managed on its own. Amazon subtracted 16.93 points and Meta another 13.29. On the other side, Nvidia added 11.23 points, Micron added 9.52 on an 8.48% jump, and Broadcom, AMD and ExxonMobil rounded out the positive contributors, none of them large enough to offset the mega-cap selling.

S&P 500 attribution map, cell size = points contributed

The Dow

The Dow closed at 51,947.00, down 199.42 points, or 0.38%, a smaller percentage decline than the S&P's but built on much narrower footing: only 13 of 30 members rose. Concentration ran hot at 213%, and the equal-weight measure fell 0.35%, the opposite of the S&P's equal-weight gain. Where the broader market's breadth argued for a shallow, contained pullback, the Dow's own internals argued the other way.

The Dow through the session

American Express did the most damage, subtracting 173.67 points on an 8.22% drop, the week's largest single detractor across all three indices. Alphabet cost the Dow 160.66 points, Amazon 89.87, Sherwin-Williams 81.55 and Microsoft 72.04. Travelers, Honeywell, 3M, JPMorgan Chase and Johnson & Johnson all pushed the other way, with Honeywell up 8.06% and 3M up 7.97%, but the five gainers combined could not fully offset the top five losers.

Dow attribution map, cell size = points contributed

The Nasdaq 100

The Nasdaq 100 took the week's steepest hit, closing at 28,128.34, down 464.32 points, or 1.62%. Breadth was the thinnest of the three indices at 37 of 103, and unlike the S&P, the equal-weight version here also fell, down 1.04%. This was not a narrow-index-versus-broad-market story; the selling reached the average Nasdaq 100 stock too.

The Nasdaq 100 through the session

Alphabet's two classes were, once again, the story: GOOG cost 203.11 points and GOOGL cost 189.04, a combined 392.15 points, by far the largest drag in any index this week. Amazon subtracted 112.26 points, Tesla 94.42, Microsoft 82.92. On the positive side, Apple added 154.16 points despite a slightly negative 0.22% return, Nvidia added 84.23, Micron 61.85, AMD 44.61 and Cisco 13.47. The chip names carried the index's better half while the software and platform names carried the worse one.

Nasdaq 100 attribution map, cell size = points contributed

The sectors

Across the eleven sectors, the spread ran from Energy's 3.36% gain to Consumer Discretionary's 5.22% loss, with Industrials, Materials and Real Estate all posting gains north of 1%, while Technology and Financials barely moved and Communication Services fell 3.94%.

The 11 sectors by move, top contributor named

Energy was the week's strongest sector, up 3.36%, adding 1.94 points, with ExxonMobil the top driver at 0.73 points on a 6.49% gain.

Energy: what moved it

Consumer Discretionary was the weakest, down 5.22% and subtracting 6.03 points from itself, with Tesla the dominant driver at negative 3.86 points on its 17.81% decline.

Consumer Discretionary: what moved it

No percentile figure is available for any of the three indices this week, so this note makes no claim about how the size of the move stacks up against the past year.

The numbers

From Babylon Burns

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IBM's 26% Slide and a Chip Selloff Drag the Nvidia and Microsoft Lead a Broad Weekly Ral
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Compiled by the WMTMT attribution engine from the session's official data · built by the founders of Babylon Burns