The binary resolved to the upside
A chip shock spiked the VIX to 18.7, then Microsoft and Amazon squeezed the shorts and collapsed the vol. Leveraged funds were caught net short into the rally, and the VVIX printed its lowest since July 10.
The tail hedge paid on Wednesday and was worthless by Friday. A chip shock out of Seoul spiked the VIX to 18.7, the S&P slipped into negative gamma, and the put skew ran to a three-month high. Then Microsoft and Amazon walked in, the shorts got run over, and the whole surface exhaled.
Last week the vol surface priced the next five sessions as binary, puts expensive, calls cheap, short interest at a sixteen-year high, and left the question open. This week answered it. The binary resolved to the upside. A mid-week semiconductor rout gave the bears their moment, the VIX touched 18.7 on Wednesday July 29 and SPX put skew hit a three-month high, and then a two-day reversal powered by hyperscaler earnings and a violent chip snapback squeezed the shorts, collapsed the vol, and unwound the hedges almost as fast as they went on. The VVIX printed its lowest since July 10. Leveraged funds spent the week deeply net short into exactly the rally that ran them over.
The chip shock was the fuse
The catalyst came from Asia, not America. Samsung fell 16 percent and SK Hynix went limit-down in Seoul on Tuesday July 28, a memory-chip rout that dragged the entire semiconductor complex and pushed Nasdaq 100 implied volatility to the top of its two-year range relative to 20-day realized. On the same session the S&P 500 slipped to the threshold of negative market-maker gamma per SpotGamma, the regime where dealers hedge with the move instead of against it and intraday swings get amplified rather than dampened. That is the mechanical reason a chip headline in Korea turned into a half-percent S&P drop and a VIX spike. The gamma was not there to absorb it.
The VIX spiked, then gave it all back
Spot vol moved, and then it surrendered.
Wed Jul 29: VIX about 18.7, VVIX about 102, $SPX minus 0.5 percent, $NDX minus 0.6 percent
Thu Jul 30: VIX about 18, $SPX plus 1.4 percent, $NDX plus 3.1 percent, Microsoft beat
Fri Jul 31: VIX about 16.7, VVIX below 91, its lowest since July 10
The VIX peaked near 18.7 on Wednesday as the chip selloff accelerated, then fell more than two points on Thursday when Microsoft's earnings beat sent the S&P up 1.4 percent and the Nasdaq 100 up 3.1 percent. By Friday it had compressed to 16.7. The real signal is one level up. VVIX, the volatility of volatility, peaked near 102 on Wednesday and collapsed below 91 by Friday, its lowest reading since July 10. That is not a market catching its breath. That is a rapid, wholesale unwind of the macro hedging demand that had been building for two weeks. The convexity bid vanished.
The IV snapshot: SPX calm, the chips still hot
As of Friday July 31, the 30-day at-the-money implied vol told a split story.
$SPX: 13.1 percent
$NDX: 23.0 percent
$RUT: 18.3 percent
The SPX number is a calm-market print, back near the floor of the year. The NDX at 23 is the residue of the chip shock, still elevated because the semiconductor names that drove the rout are the ones the Nasdaq is most concentrated in, and their realized vol was violent in both directions this week. The RUT at 18.3 sits in between, and as the positioning below shows, small caps stayed the most defensively hedged corner of the market all week.
The skew round-tripped through the shock
SPX normalized put skew reached a three-month high mid-week as the selloff materialized and hedgers reached for downside. Then it collapsed on the Thursday rally, broad hedging demand evaporating almost the moment the tape turned. NDX skew, which never reached the same extreme, eased in sympathy. This is the same round-trip pattern the surface has printed for weeks. When the feared event arrives and then reverses, the protection that was bid at the highs gets sold into the recovery, and the skew compresses faster than it steepened. The demand for tails this week was real, but it was not sticky.
Put and call open interest: the QQQ unwind, the IWM holdout
The open-interest ratios drew the clearest line between the tech recovery and the small-cap holdout.
$SPY: 1.877, 1.962, 1.965, 1.938, 1.935 (Mon to Fri). Peaked mid-week, eased slightly.
$QQQ: 1.375, 1.340, 1.290, 1.224, 1.220. A steady, five-session decline.
$IWM: 2.743, 2.839, 2.808, 2.738, 2.698. Elevated all week.
QQQ is the story. The put-call open-interest ratio fell every single session, from 1.375 on Monday to 1.220 on Friday, as put hedges came off and calls got added into the Microsoft and Amazon prints. That is the options-market signature of a hedging unwind, the mirror of the vol compression. IWM went the other way. Its ratio stayed pinned between 2.70 and 2.84 all week, the highest of the three by a wide margin, consistent with the higher RUT implied vol and the small-cap short base in the futures. SPY held near 1.94, defensive but neutral, the broad market neither chasing nor capitulating.
Leveraged funds were caught net short
The CFTC Traders in Financial Futures data as of Tuesday July 28 shows exactly who was on the wrong side of the reversal.
ES1 (S&P 500): net minus 297,476, weekly change plus 25,389
NQ1 (Nasdaq 100): net minus 58,298, plus 16,392
RTY1 (Russell 2000): net minus 74,620, minus 1,152
Leveraged funds went into the week deeply net short across all three equity index futures. That is the fuel. The short cover in ES, plus 25,389 contracts, and NQ, plus 16,392, is the footprint of that fuel igniting, shorts getting squeezed out as the tech earnings delivered and the tape ripped higher Thursday and Friday. The vol compression and the short cover are the same event seen from two instruments. RTY is the exception that proves the theme. Its net short actually grew by 1,152 contracts, the only book where funds added to shorts rather than covered, and it lines up precisely with the elevated IWM put-call ratio. Small caps were the one place the bears held their ground, and the one place the squeeze did not fire.
The gamma event: Amazon at 155 percent
The single most violent mechanical move of the week was in Amazon. After shares jumped 13 percent, $AMZN options required delta re-hedging of roughly 155 percent of average daily volume in Friday's premarket, a gamma event of the first order driven by the call positioning that had built up into the print. When dealers are short that many calls and the stock gaps, they have to buy the underlying to stay hedged, and the buying itself extends the move. That is a squeeze inside a squeeze. It did not happen by accident. Retail call buying in mega-cap tech hit a six-year high into the earnings week, calls making up 55 percent of retail trades on Alphabet, Amazon, Meta, Microsoft and Oracle across Cboe exchanges over the prior month. The crowd was positioned long upside going in, and Amazon and Microsoft rewarded it.
One structure worth flagging for the desk. Susquehanna noted the Meta straddle was pricing a 7.5 percent move into earnings, below the stock's eight-quarter average realized move, which made owning the straddle cheap relative to how Meta actually trades on prints. When the implied is below the realized track record on a known catalyst, the straddle buyer is getting a discount on convexity. That is the opposite of the SPX tail, where the convexity was expensive. The dispersion between cheap single-name vol and richly-hedged index vol was the trade of the week.
What the surface is saying
Put it together and the week has a clean shape. Leveraged funds entered deeply net short. A chip shock out of Seoul spiked the VIX to 18.7 and ran SPX put skew to a three-month high mid-week, exactly the tail the surface had been pricing. Then Microsoft and Amazon walked in, the semiconductor names snapped back with SK Hynix hitting its plus 30 percent daily limit by Friday, and the whole structure reversed. Shorts covered, vol collapsed, QQQ hedges unwound, and the VVIX printed its lowest since July 10. The known-unknown resolved, and it resolved up.
Two things to carry forward. First, the small-cap corner never joined the recovery. IWM's put-call ratio stayed near the top of the board and RTY was the only futures book where shorts were added, not covered. If there is a soft spot in the tape, it is there, in the rates-sensitive names into the next Fed window. Second, the single-name vol is where the value is now. With index hedges unwound and the VIX back near 16, the cheap convexity is not in the SPX tail anymore, it is in the individual earnings straddles the Meta pricing pointed at. The index has exhaled. The single stocks are still moving.
The one-line read
Last week the surface priced a binary. This week it resolved to the upside. A chip shock gave the bears a mid-week spike to VIX 18.7, and then Microsoft, Amazon and a violent semiconductor snapback squeezed the shorts, collapsed the vol, and unwound the hedges into the lowest VVIX since July 10. Leveraged funds were caught net short into the rally that ran them over. The only holdouts were the small caps, still hedged, still shorted, still waiting. The index got its melt-up. Watch whether the Russell follows, or whether the small-cap short base is telling you where the next crack opens.
Sources: Bloomberg, week of July 27 to 31, 2026. Stocks Fall as Chip Slump Overshadows Oil Drop, Markets Wrap (Jul 28). US Stocks Rise as Microsoft Counters Bond Rout, Markets Wrap (Jul 30). Global Stocks Rise as Chip Rebound Gathers Speed, Markets Wrap (Jul 31). GME Long-Dated Calls, SK Hynix Call Ratios, US Options Snapshot (Jul 28). South Korea ETF Vol Sale, Alphabet Roll, US Options Snapshot (Jul 29). Memory ETF Call Ratios, Altria Put Buying, US Options Snapshot (Jul 30). SpaceX Vol Sale, Microsoft Call Spreads, US Options Snapshot (Jul 31). SpaceX Put Ratio, Warner and Uber Put Selling, Options Snapshot (Jul 27). Amazon Delta Hedge at 155 percent Daily Volume, Options Pre-Market (Jul 31). Cboe for VIX, VVIX and the SPX skew term structure. CFTC Traders in Financial Futures for leveraged-fund positioning. SpotGamma for the gamma read. Susquehanna derivatives strategy.
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