S&P 500: Liquidity Pressures Build as Settlements Rise and Reserves Decline

Published 29/08/2025, 07:55
Updated 29/08/2025, 07:56

It was a boring Thursday. Expectations were for Nvidia (NASDAQ:NVDA) to move by around 6%, but instead, it hardly budged, remaining around $180. Still, the S&P 500 rose by 30 bps, while implied volatility fell sharply. In theory, given the size of the drop in the VIX 1-day, the move higher could have actually been bigger—as noted on Wednesday, it implied a potential gain of up to 1%.VIX-1-Day-Hourly Chart

Treasury bill settlements have been quiet this week, with $45 billion and $26 billion so far. Today brings a $36 billion coupon settlement, but the larger event comes on Tuesday, with a combined coupon and bill settlement of $140 billion — a sizeable amount compared to recent weeks.

The key difference is that next week, the reverse repo facility will have nothing to offer and will not serve as a source of liquidity to fund the settlements.S&P 500, Reverse Repo, Treasury Settlements

As of August 27, the TGA stands at just below $600 billion, leaving approximately $250 billion still to be replenished to $850 billion. The first $200 billion of the refill was largely offset by the reverse repo facility, while the second half of the refill is expected to come from reserve balances.Repo-TGA-Reserves Chart

Those effects are now becoming visible, with reserve balances at the Fed falling from roughly $3.3 trillion last week to $3.216 trillion this week. Reserves remain on track to reach about $2.9 to $3.0 trillion by the end of September, which would take them back to the lows last seen in the fall of 2022.Factors Draining Reserves

I know many assume we are in a period of fiscal dominance and that is driving asset prices higher, but the truth is, we really don’t know. It could be fiscal dominance, or it could simply be the draining of the reverse repo facility that provided the liquidity to fund the fiscal dominance, which helped to lift stock prices.

Equity prices clearly struggled once the Fed ended QE in early 2022 as the repo facility was rising, and they certainly benefited as the reverse repo facility began to drain in mid-2023.RRPONTSYD-Daily Chart

We’ve now entered a period we really haven’t experienced since Covid, when the Fed launched its “QE infinity” experiments.

So we are going to start finding out more, I would think pretty shortly.

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