Why Phathom Pharmaceuticals, Inc. (PHAT) stock fell 5.9% intraday on Tuesday, November 3, 2026

Phathom Pharmaceuticals, Inc. (PHAT) traded at $5.57 as of 1:31 PM ET, down 5.92% on Tuesday, November 3, 2026, on volume of 926,135 shares (0.6× its 3-month average); market value about $500.0M.

PHAT was among the stocks moving 5% or more in an earlier update that day; by the close it was no longer moving that much.

What happened: primary sources

Events Nexqual found for PHAT on Tuesday, November 3, 2026 or the trading day before (November 2, 2026):

• Nov 2, 2026: Schedule 13D/A: Frazier Life Sciences Public Fund, L.P., FHMLSP, L.P., 7.4% of shares, a 5%+ holder that may seek to influence the company source
• Nov 3, 2026: One of 4 Biotechnology stocks among the day's biggest losers (RYTM, ARVN, MDGL, PHAT), with no comparable group among the biggest gainers

These are listed as context. A filing or rating change on the same day is not proof that it caused the move; read the source.

More on PHAT

PHAT stock page: price, SEC financials, insider trades, superinvestor holders, analyst estimates and options. Other big moves that day: November 3, 2026.

Sources: SEC EDGAR, Nexqual Earnings Flash, analyst rating changes, Nexqual market data. Built November 4, 2026 at 09:50 UTC. Not investment advice.

Data source: Nexqual. Last updated: November 4, 2026 at 09:50 UTC. This page is informational and not investment advice.

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