The S&P 500 Just Flipped Regimes Twice: Here Are the Levels That Matter
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Key Points:
- Intraday on July 16, with spot near $7,545.64, the options market's zero gamma flip sat just 4.6 points below spot, and the call wall at 7,580 sat roughly 34 points above it. A daily close above 7,580 opens 7,750 to 7,800, a 2.4% to 3% advance from the July 15 close.
- The flip moved. At 1:30 p.m. ET on July 14, two days earlier, a separate live reading had dealer gamma outright negative, with spot trading below its own modeled flip the level. The regime switched inside 48 hours, and that instability is the real signal, more than either exact level.
- By July 16, stronger retail sales and jobless claims data plus renewed Iran - US strikes had pushed September Fed rate hike odds back toward the upper end of a 45% to 65% range, depending on the source checked. A hawkish surprise landing while gamma is negative is the fast route to a retest of 7,100.
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Two days ago, dealer gamma on the S&P 500 was negative. As I write this, intraday on July 16, 2026, it’s barely positive again, sitting on a cushion of roughly 5 points. That swing shaped this week’s price action more than Tuesday’s CPI print did. The CPI print has already been read and digested by everyone who will open this piece. What follows covers the current gamma map, how fast it has been moving, the Fed calendar that decides which way it breaks next, and the level actually worth watching in place of the one most coverage quotes.