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NY Pre-Market Brief

Amazon soars, Apple craters, yields spike—mega-cap earnings whipsaw stocks into month-end

Friday, July 31, 2026 · the tape framed before the US open · bias: mixed

Two very different earnings reactions are canceling each other out and the index is chopping around flat into the cash open.

Thursday's session closed strong, S&P up about 1.7% to 7,437 and the Nasdaq up over 3% as chipmakers ripped and Microsoft added roughly $450 billion in a single session. Overnight follow-through was fierce, Korea's Kospi surged as much as 18% on an SK Hynix limit-up move, and Nasdaq 100 futures were bid over 0.9% pre-bell. That optimism cracked once Apple's disappointing forward guidance hit, the stock down sharply in its worst post-earnings reaction in over a decade, while Amazon offset it with a blowout quarter and a double-digit pop. Add a 10-year yield pushing to its highest level since January 2025 and the tape has round-tripped from up over 1% to roughly flat by mid-morning.

Vol regime is elevated single-stock, contained index — mega-cap earnings dispersion is doing the damage while SPX realized vol stays orderly. Dealer gamma context is indicative only today, but positioning likely sits long-gamma into the 7,430-7,440 area given the prior day's rally, meaning dip-buying and range-compression near current levels, with upside chase capped until spot clears the 7,470-7,500 zone. Today's docket is thin: Employment Cost Index at 8:30 and final Michigan sentiment at 10, both second-tier next to the earnings tape and Wednesday's Fed hold.

The risk: yields. A break above the recent 10-year high reprices the entire AI-capex-and-multiple trade regardless of what Amazon or the chip complex print, and month-end rebalancing flows could exaggerate any afternoon reversal.

Levels that framed this session

Watch10-year yield breaking to fresh highs vs Amazon/Apple earnings dispersion
Catalyst8:30am Employment Cost Index, 10am Michigan sentiment final
SPY flip~744-746 (Thursday's close, pivot for today)
QQQ support~670-674 (pre-market low / gap-fill zone)
SPY call wall~750-755 (round-number resistance, indicative)
QQQ resistance~685-690 (Thursday's high area)

This note is written from live dealer positioning.

The same gamma data behind it — the flip, the call and put walls, and where price sits between them — is on the terminal for any ticker, updated through the session. Every setup we publish carries its entry, stop and target before the trade, and gets graded in the open afterwards.

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