4,076 U.S. stocks fell as oil topped $100 and the S&P 500 dropped 0.5%

The S&P 500 closed at 7,637.70, down 0.47%. That is not what most of the market did. Counted name by name, Wednesday was a broad decline that cap-weighted funds only partly showed, the second session in a row of that split. A handful of large winners, led by Meta Platforms, made the indexes look calmer than the board underneath them.

1,545 stocks rose; 4,076 fell

Of 5,834 U.S. common stocks listed on the NYSE, Nasdaq and NYSE American, 1,545 advanced, 4,076 declined, and 213 were unchanged. The count excludes ETFs, funds, foreign listings, and currency and crypto symbols.

That is the session. The S&P 500 fund ASPY fell 0.46%. The Nasdaq-100 fund AQQQ fell 0.29%. Neither print describes a market in which seven in ten listed stocks went down.

ETF Trends noted that Brent rose above $100 a barrel for the first time since July after an escalation in the Middle East. After the 4 p.m. Eastern equity close, Brent was at $101.60, up 3.8% on the day. Exxon Mobil, the oil producer, rose 2.2% with it.

The 10 largest holdings are 38% of ASPY. That concentration is why a 0.5% index decline and a 2.6-to-1 declining board can coexist. It is not why the index fell. Inside ASPY, the eight biggest contributors and detractors together accounted for only 15% of the fund's move. The selling was spread across the book. The weights just made it look smaller.

Equal-weight lagged by half a percentage point

The S&P 500 equal-weight fund BRSP fell 0.96%, trailing ASPY by 0.50 percentage points. The average S&P 500 stock fell about twice as much as the cap-weighted index.

Casey's General Stores, the convenience-store chain, dropped 14% after reporting that inside same-store sales, the food and merchandise sold in its stores, grew 3.2%, slower than a year earlier, even as earnings beat estimates. It was the largest hole in BRSP and subtracted 0.02 percentage points. The eight largest pushes and pulls together explained only 5% of the equal-weight decline.

The Russell 2000 small-cap fund AIWM fell 1.36%, the weakest of the four major size and style prints. Tuesday's selling had already been broad. Wednesday it moved down the cap ladder.

Over five sessions through Wednesday, AQQQ is up 1.2% and ASPY is barely positive. BRSP is down 1.4%. The latest session is the latest print of a week in which the Nasdaq-100 has been rising and the average large-cap stock has not.

Over one month, BRSP is down 2.5% and AIWM is down 3.1%, against 1.4% for ASPY. Year to date, the Russell 2000 fund is still up 18.6% and equal-weight still holds a slim lead on the S&P 500 fund. ASPY remains above its 50-day average. BRSP and AIWM do not.

Five mega-caps rose. Only Meta mattered

Only 5 of 20 mega-caps finished higher. Meta Platforms rose 6.6% after the company said interest in a new AI agent had blown past its expectations, and added 0.13 percentage points to ASPY. That was the day's largest lift in the cap-weighted fund, and it was not enough to turn the index up.

Nvidia, an 8.3% weight, fell 0.86% and subtracted 0.07 percentage points. Amazon fell 1.8%. Alphabet's Class A shares fell 2.3%. Apple, which unveiled a foldable iPhone at its first event under CEO John Ternus, slipped 0.28%.

The Nasdaq-100's 0.29% drop is the cleanest illustration. Meta added 0.19 percentage points to AQQQ. Micron added 0.14. Advanced Micro Devices added 0.11.

The read is a broad decline that cap-weighted indexes understated, with crude above $100. Thursday would need the average S&P 500 stock to keep pace with ASPY on a day when oil is not still climbing. That print would show whether Wednesday's lag needed oil to persist. Another down day for equal-weight and small caps, with a few large winners cushioning the index, would not settle it.