AUG · ISSUE 33 · August 13, 2026
ZOOM INThe index climbs while the giants fall behind
A record S&P 500 with six of the seven megacaps in the red. Only NVDA and the chips are doing the lifting.
CONCENTRATION
~40%
of the index in 7 names
MAG-7 IN RED
6 of 7
only NVDA green
KOREA CHIPS
+23%
in 10 days
THE NUMBER
40%
↑ the weight of the 7 largest names in the S&P 500
Never have so few companies carried so much of the index. The record rally rests on an ever narrower base: if the heavyweights roll over, there is no breadth left to cushion it.
VALUATION
THE NUMBER56%
56%
▲ +30% just to reach 1 standard deviation
That's the theoretical upside if the giants returned to their average multiple. JPM's caveat: 'it isn't happening yet'.
JPM puts the Mag-7 more than 2 standard deviations below their average P/E. Cheap versus their own history, not versus the market.
- P/E
- — How many years of profit you pay for a stock.
- STD DEV
- — How far a number sits from its historical average.
QUOTE
AUTHORITYCheap, but nobody is pulling the trigger
“The seven largest names trade more than two standard deviations below their average P/E. The upside is there, but it isn't materializing yet.”
The upside exists on the spreadsheet. Whether money flows in now is another matter.
- MULTIPLE
- — What the market pays per dollar of earnings.
- MEAN REVERSION
- — Drifting back to the average after moving away.
TREND
12 MONTHSBreadth has been shrinking for a year
A healthy index rises on hundreds of names. This one rises on seven, and lately on one.
Weight of the 7 largest names in the S&P 500, month by month. The line rises: fewer and fewer stocks move the index.
- CAP-WEIGHT
- — An index where the biggest names weigh the most.
- BREADTH
- — The share of stocks joining the move higher.
SIGNALS
WHAT TO WATCHThree signs of a narrow rally
ONLY NVDA IS PULLING
Six of the seven giants closed red. The index holds up thanks to a single name and the memory-chip complex.
THE MEGACAP BASKET STALLS
The basket of the seven largest is drifting away from its technical trigger. Without that leadership, the index loses its main engine.
CHIPS TAKE OVER
What's accelerating is memory and semiconductors (Korea +23% in 10 days). Narrower, more volatile leadership than the whole tech block.
The index record hides three warnings that never make the headline.
- MEGACAP
- — A giant company by market cap (hundreds of billions).
- MEMORY
- — Storage chips (DRAM, NAND), highly cyclical.
- LEADERSHIP
- — The stocks steering the market higher.
COMPOSITION
WHO MOVES THE INDEXWho really carries the S&P 500
40% of the index fits in seven tickers. The other 60% is spread across nearly 493 companies.
It isn't a balanced split: a third of the index rides on a very small block.
- TICKER
- — A stock's trading symbol (NVDA, AAPL).
- WEIGHTING
- — How much each stock counts inside the index.
WATCHLIST
5 KEY ETFsFive ETFs to measure breadth
| MAGS | 62.40 | ▼ -0.3% | Basket of the seven giants. Drifting off its technical trigger. |
| SMH | 298.10 | ▲ +1.6% | Chips. The one engine accelerating: memory and Korea. |
| RSP | 191.20 | → +0.1% | Equal-weight S&P. Measures the market's real breadth. |
| QQQ | 612.50 | ▲ +0.4% | Nasdaq-100. Rising on the same seven names. |
| SPY | 776.80 | ▲ +0.3% | S&P 500. A record, but carried by very few. |
Same market, five readings. Comparing the index with its equal-weight version tells you whether the rally is real or just a few names.
- ETF
- — A listed basket that tracks an index or sector.
- EQUAL-WEIGHT
- — An index where every company counts the same.
- NASDAQ-100
- — The 100 largest non-financial Nasdaq names.
WRAP-UP
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- MAG-7
- — The seven largest US tech names.
- CONCENTRATION
- — How much of the index depends on a few names.