SPY Put Wall at 758 Tested as Index Gamma Flips Negative Across Desk

Benzinga reported Friday that over $30 billion flowed into ETFs, with the iShares Core S&P 500 ETF leading inflows at $6.5 billion. MT Newswires noted mixed pre-market trading for equity futures and major exchange-traded funds as tech sector momentum continued alongside AI capex concerns. While headline ETF inflows suggest heavy buying pressure, the options map reveals a fragile dealer positioning environment heading into the session. I read the index option chain, and right now all three major trackers are sitting in short gamma territory. SPY trades at 759.1, positioned below its flip level of 764.03 and just above its key put wall at 758. QQQ sits at 716.48 beneath its 718.04 flip, with a put wall at 715 and a call wall at 720. IWM sits at 282.97 against a 289.74 flip, hugging its put wall at 282. When spot sits below the gamma flip, dealers switch from shock absorbers to trend accelerators. Instead of buying dips to keep the tape calm, short gamma forces market makers to sell into decline and buy into strength to maintain dynamic hedges. That regime widens expected intraday ranges across the desk. SPY currently carries an expected move of plus or minus 0.82%, QQQ sits at plus or minus 1%, and IWM prices an expected move of plus or minus 1.02%. SPY's position at 759.1 makes the 758 put wall the primary level to watch. Put walls act as major structural support hubs because large open interest concentrations demand heavy dealer hedging activity around the strike. Across my tracked sessions, SPY's expected move has contained spot 38 out of 39 times, a 97.4% rate against a 68% baseline. Across my broader historical backtest of 1,008 scored sessions, containment holds at 74.2%. With SPY skew at 1.7 and QQQ skew elevated at 3.2, put pricing remains bid relative to calls across the index suite. If 758 holds, dealers have room to absorb flows back toward the 764.03 flip. If 758 breaks, short gamma acceleration increases the probability of expanded range toward lower strikes. The wire explains where capital moved this morning, but positioning shows where dealers are forced to trade if price tests these boundaries.