Semiconductor funds fall 6% as cybersecurity ETFs rise 8%

Nvidia subtracted 0.27 percentage points from the S&P 500 on Monday, more than half of the index's 0.48% decline, as the S&P fell 37 points to 7,620.25, even as Microsoft, Alphabet, CrowdStrike and Palo Alto Networks pushed the other way. The cleaner description of the session is not that technology fell. It is that the hardware and software sleeves of the same AI trade went in opposite directions.

The selling followed a weekend in which Anthropic chief executive Dario Amodei, in an essay titled "We Must Pace the Frontier," called for a slower pace of frontier-model development. OpenAI's Sam Altman, xAI's Elon Musk and Google DeepMind's Demis Hassabis said they agreed. President Trump did not. That is a thin basis on which to reprice the companies that make the chips, and a convenient one on which to bid up the companies that sell the security software. Both things happened anyway. Motley Fool reported that investors bought cybersecurity stocks to hedge those AI-risk warnings. Rubrik, a name both cybersecurity funds hold, rose 15.6%.

South Korea's Kospi, heavy with chipmakers, had already dropped 3.3% overnight. By the 4 p.m. ET close in New York, all 15 semiconductor ETFs in the group were lower, a median 5.8%. All 8 cybersecurity funds were higher, a median 7.8%. The iShares Expanded Tech-Software Sector ETF CIGV gained 5.0%. The VanEck Semiconductor ETF ASMH lost 4.8%. That is a 9.8 percentage point gap inside what still gets labeled, lazily, as one trade.

The construction of the cybersecurity funds mattered. CBUG is a pure software book: Okta, CrowdStrike, Fortinet and Palo Alto Networks are its largest names, and it closed 10.7% higher, a whisker from its 52-week high of $44.58. BCIBR, the larger fund at about $15.3 billion, holds Broadcom at 6.1%, Cisco at 7.0%, and Arista. Broadcom's 4.8% decline cost BCIBR 0.29 percentage points; Cisco, Arista and NetApp took another 0.39. The 4.7 percentage point gap is mostly construction: CBUG owns none of those names, and it holds more of the software stocks that jumped.

CrowdStrike, Palo Alto, and the software bid

CrowdStrike rose 13.9% to $235.38 and tagged a 52-week high of $239.37 during the session. Palo Alto Networks gained 13.1% to $373.94. Fortinet added 9.0%. Palantir, which sits on the software side of the AI ledger, rose 3.6%. None of those prints were an earnings event: Palo Alto last reported on September 1, CrowdStrike on August 26.

Those two cyber names were among the largest positive contributors to the Invesco AQQQ Trust AQQQ, which still fell 0.8%.

Weight is destiny in a cap-weighted product: CrowdStrike is less than 1% of AQQQ. Nvidia is 8.4%.

Microsoft rose 2.0%. Alphabet Class A rose 3.2%. Meta Platforms rose 2.7%, and with Netflix up 3.8% that was enough to lift the communications sector fund AXLC 2.2%, its third straight gain and the best of the 11 SPDR sector funds. Software had a bid. It was simply not large enough, in the indexes most people own, to offset the chips.

Nvidia, Micron, and the cap-weighted drag

Nvidia closed at $210.96, down 3.4%, and at 8.0% of ASPY it was the S&P 500's largest single detractor. Broadcom contributed -0.12 percentage points, Micron -0.09, AMD -0.06. Lam Research dropped 8.3%. Intel fell 5.6%. Across the 504 holdings in ASPY, the attributed move was -0.48 percentage points, matching the fund.

That concentration is why the cap-weighted S&P 500 and its equal-weight twin disagreed. BRSP closed 0.07% higher, a 0.51 percentage point spread versus ASPY. Health care AXLV gained 1.4%. Consumer staples AXLP gained 1.2%, a third straight advance. Technology printed its heaviest volume in 20 sessions.

Of 5,447 U.S.-listed ETFs that priced, 1,500 closed higher and 3,801 closed lower. The median fund had a down day. The equal-weight S&P 500 did not.

The longer arc is less dramatic than Monday's split. ASMH is still up 50% in 2026 and 19% below its 52-week high. CIGV is up 0.9% this year and down 5.1% over 12 months. One session does not close a 49 percentage point year-to-date gap. It does show that "AI exposure" is not a single holding.

The Nasdaq-100 fell 0.82% to 29,127.16. The Dow industrials slipped 0.3% to 52,421.20, with Goldman Sachs and Caterpillar the largest drags. The Russell 2000 lost 0.4%. The VIX rose 8.0% to 17.10, a modest uptick against a 52-week high of 35.30.

Pipeline shutdown lifts oil; the 10-year touches 5%

The bid in crude traces to last week's attacks on Saudi Arabia's East-West pipeline, which Riyadh then shut, a bypass that had been moving crude around the Strait of Hormuz. West Texas Intermediate was at $101.92 a barrel, up 1.9%, as of 4:36 p.m. ET, well below a session high of $104.95. Brent was at $106.25, up 1.6%. The USCF oil fund BUSO closed 1.1% higher, 10.4% over five sessions, and 1.8 times its typical volume.

The energy equity fund did not follow the commodity. State Street's energy sector ETF AXLE traded as high as $66.03, within 0.2% of its 52-week high, then closed at $64.53, down 0.9%, on its heaviest volume in 20 sessions. Oil funds and producer funds were not interchangeable on Monday.

The 10-year Treasury yield traded to 5% during the session, its first touch of that level since October 2023, then the official close printed 4.97%. The Wall Street Journal tied the move to the oil surge. The 2-year closed at 4.65% and the 30-year at 5.34%. Long Treasurys barely noticed: the iShares 20+ year Treasury ETF BTLT printed a 52-week low of $80.46 and still closed 0.1% higher.

Credit was less forgiving. The iShares high-yield corporate bond ETF BHYG fell 0.1%, a sixth straight decline, and closed at $78.53 against a 52-week low of $78.41, on some of its heaviest volume in 20 sessions. Investment-grade ALQD was little changed, a fourth straight decline.

The Federal Open Market Committee meets Tuesday and Wednesday with the funds rate in a 3.50% to 3.75% range. Friday's CPI already did the heavy lifting on hike odds: headline inflation rose 0.4% in August and 3.4% over 12 months, with gasoline up 3.9% on the month. Oil still above $100 does not make that meeting easier. A 10-year yield that only visited 5% does not make it a crisis.

The reading that fits Monday's technology split is a one-session move with a good headline. Chip funds extending this decline while software does not, and the 49 percentage point year-to-date gap between ASMH and CIGV starting to close, would be the evidence that the weekend essays were the beginning of something.