The S&P 500 Is Being Held Together With Glue, And The Cracks Are Showing

The S&P 500 faces strain as the cap-weighted index diverges from its equal-weight counterpart.

It was a tale of two markets. The cap-weighted and equal-weight indexes continued on divergent paths, and the SPY/RSP ratio fell 1.6% to 3.50, a level it has held every time it has tested this year. Above, 3.66 has now been rejected three times since November, and the third rejection has been the sharpest. If Amazon (AMZN) stays down tomorrow and 3.50 gives way, SPY is likely to keep underperforming RSP, with 3.37 the next level down.

TradingView daily chart of SPY/RSP ratio from May 2025 to Oct 2026, closing at 3.50, down 1.56%, with RSI at 35.09 showing key resistance levels near 3.66, 3.57, and support near 3.37

The dispersion trade is also cracking, as anyone would guess. Earnings are passing every day, and single-stock implied volatility is falling faster than the VIX, which showed up in the 1-month implied correlation index rising 1.65 points on the day to 10.38

TradingView chart of Cboe S&P 500 Dispersion Index, daily, closing at 36.63, down 4.31%, with a sine-wave cycle overlay and RSI(14) panel showing values near 50.68 and 58.49

With all of that rotating around, it is no wonder the S&P 500 finished the day down just 30 bps while the RSP finished higher by more than 1%. At some point the rotations won’t be able to hold everything up, and the question is when, and how much damage is done when they stop. That isn’t easy to answer. But I do know liquidity is tightening. Overnight repo rates rose to 3.97% today, up from 3.91% on October 19, which means SOFR will probably print around there tomorrow, nearly 7 bps above IORB.

Reserves are back near $2.9 trillion, below the $3 trillion line that has mattered, and sitting at the low end of their range.

Line chart of reserve balance estimates from Jul 2025 to Oct 2026, declining from about 3.4 trillion to around 2.85-2.90 trillion

On top of that, T-bill issuance is still running, and that will keep draining liquidity and pressuring overnight rates.

Line chart comparing cumulative net T-bill issuance (inverted, blue) to S&P 500 (orange), Nov 2025 to Nov 2026. Issuance and S&P often move oppositely; since September, issuance has risen sharply toward $700B while S&P has declined from near 6,800 to about 6,400

At some point, all of this catches up to the market. CDS spreads are widening, liquidity is tightening, and the rotations are doing more work every day to hold the index together. The cracks are starting to show.

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