Short Gamma Rules the Close as SPY and QQQ Slide Below Flips

The cash open failed to hold early support, sending SPY down 0.74% on the session to 765.61 as short gamma positioning amplified price swings into the close. With spot now sitting well below the 772.67 flip line, dealers are no longer absorbing volatility by buying dips. Instead, they are forced to sell into weakness, widening price swings as SPY trades between its 772 call wall and 763 put wall. The move remained within today's expected move of 0.82%, but the structural shift keeps the tape vulnerable. QQQ faced similar structural pressure, dropping to 736.49 against a flip level of 742.18. Sitting in short gamma between a 745 call wall and 730 put wall, the index shows a elevated skew of 1.5, reflecting dealer hedging demand as tech shares slipped. The weakness was felt across broader markets, with Russell futures declining 0.67% and Treasury yields firming as the 10-Year yield rose 1.08% to 5.24%. Individual headlines did little to turn the tide for equities. CNBC reported that Dan Ives called Nvidia's buyback plan a genius move, while TipRanks noted Nvidia added $150 billion to its buyback program. Decrypt reported that Strive bought $94.5 million in Bitcoin, pushing its holdings past 27,000 BTC. Despite corporate capital deployments, broader liquidity concerns dictated the closing bell. Crypto markets mirrored the cautious sentiment in equities. MarketWatch reported that Bitcoin is heading for its longest losing streak in nearly four months, with spot trading near 83,517. Unlike the equities sector, BTC remains above its 83,265.54 gamma flip with net positive GEX, leaving dealers on the stabilising side of the line for now. Major altcoins faced heavier selling, with SOL dropping 3.6% to 118.70 and AVAX sliding 5.34% to 10.36, both holding negative net GEX below their respective flip levels. Heading into the next session, the index options book sits in an accelerating regime. As long as SPY and QQQ remain under their gamma flips, dealer hedging will continue to widen intraday ranges rather than compress them, leaving the lower put walls at 763 and 730 as the primary structural buffers.