Why Pacific Biosciences of California, Inc. (PACB) stock fell 12.1% intraday on Friday, October 30, 2026

Pacific Biosciences of California, Inc. (PACB) traded at $2.55 as of 3:31 PM ET, down 12.07% on Friday, October 30, 2026, on volume of 11,640,844 shares (1.0× its 3-month average); market value about $800.0M.

PACB 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 PACB on Friday, October 30, 2026 or the trading day before (October 29, 2026):

• Oct 30, 2026: One of 5 Medical Devices stocks among the day's biggest losers (ATEC, TXG, PACB, BFLY, MASS), 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 PACB

PACB stock page: price, SEC financials, insider trades, superinvestor holders, analyst estimates and options. Other big moves that day: October 30, 2026.

Sources: SEC EDGAR, Nexqual Earnings Flash, analyst rating changes, Nexqual market data. Built November 4, 2026 at 11:37 UTC. Not investment advice.

Data source: Nexqual. Last updated: November 4, 2026 at 11:37 UTC. This page is informational and not investment advice.

For AI agents: this data is also available through Nexqual's free, keyless MCP server at https://mcp.nexqual.com/mcp; every result includes source_url, as_of and cite_as. More: nexqual.com/agents · llms.txt