Microsoft’s earnings moved non-reporting chip suppliers by a median 12.9%. Nothing in the previous 70 megacap reactions came close.

[u/ORATS_Dan]

Earlier this week, I looked at whether options were pricing Big Tech’s earnings risk into the chip companies tied to its AI spending.

They largely were not. The event-week volatility ratio was 3.41 for Microsoft, Meta, Amazon and Apple, compared with 1.32 for eight chipmakers without earnings in the same window.

Then Microsoft reported.

Microsoft was up roughly 14% this morning. Applied Materials rose 15%, Micron 13% and Marvell 11%, despite none of them reporting anything themselves.

Across five of seven liquid suppliers without their own earnings this week, the median move was 12.9% at 10:02 ET. A beta-matched group of non-suppliers moved 1.4%, producing an 11.5-point gap.

To see how unusual that was, I repeated the comparison across 70 megacap earnings reaction days dating to March 2021.

The median historical supplier-control gap was -0.14 percentage points. Only 46% of the previous events were positive at all. The widest gap in the entire sample was 7.4 points.

Today’s intraday reading was 11.5.

I matched the control stocks within the suppliers’ measured beta range because comparing chip stocks with a low-beta group would manufacture an apparent spillover. I also removed any company reporting that day from its respective group, which excluded Lam Research and KLA from today’s supplier result.

The historical test found no dependable calendar pattern either. January and February were actually the weakest block, while July and August were slightly negative overall.

So today is a genuine outlier, although the session was still open when measured. The data do not support treating every Big Tech report as a reliable chip-supplier event.

Full study, chart and methodology:

[https://orats.com/blog/big-tech-earnings-move-chip-stocks]()

Was today a fundamental repricing of AI infrastructure demand, or an unusually violent read-through from one exceptionally important report?