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Source document· March 27, 2026

How major US stock indexes fared Friday 3/27/2026

View original at finance.yahoo.com
How major US stock indexes fared Friday 3/27/2026 U.S. stocks closed out their worst week since the Iran war began and their fifth losing week in a row…
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  • The S&P 500 is now 8.7% below the all-time high it reached in January

    60% confidence

  • Investors fear that the war will disrupt the Persian Gulf's energy industry for a long time, setting off a punishing wave of global inflation by keeping large amounts of oil and natural gas out of global markets

    60% confidence

Data points we hold from this source

Dow Jones Industrial Average · ytd performance-6.0 percent
Dow Jones Industrial Average · weekly performance-1.7 percent
What we know · the intelligence behind this page
Live from the substrate
What we're seeing
Frontier AI Slowdown Call Splits Industry, Rattles Capex-Sensitive Markets
Anthropic's Dario Amodei publicly called for a coordinated global slowdown in frontier AI development, a stance Microsoft echoed with a 'humanist' AI code of conduct, but Nvidia and Meta's CEOs rejected any coordinated pause days later, exposing a widening rift between safety-focused and growth-focused AI leaders. The dispute landed amid growing financial scrutiny of AI infrastructure spending — a hyperscaler capex analysis, FTC warnings against antitrust waivers for AI firms, and an 8.6% single-day stock drop in GE Vernova tied directly to the slowdown remarks — signaling investors are newly nervous about whether the AI capex boom (including Alphabet's projected $701B revenue narrative) can be justified if the pace of development itself becomes contested.
Our read on the data ›
Signals we're tracking
EPKINLY Regulatory-Clinical Success Cascade
High probability of expanded label indications, additional combination approvals, and competitive positioning strength in follicular lymphoma market. Predicts positive commercial uptake and potential accelerated review for related indications.
Patterns we're watching ›
Where sources disagree
Berkshire Hathaway
Both facts report Berkshire Hathaway's cash position on 2026-01-01 with identical observation timestamps, but claim vastly different values: 380 billion USD vs 400 USD. These cannot both be true for the same entity at the same point in time. The magnitude of the discrepancy (a factor of ~10^9) rules out rounding, unit conversion, or methodological differences.
We flag conflicts openly ›
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How major US stock indexes fared Friday 3/27/2026 — Source | Via News | Via News