Form 4 Filing: ARCH Venture Partners IX, LLC Buys $25.0M of $LYEL

INSIDER PURCHASE

⚡ MATERIALITY: 8/10

corporate issuer

Lyell Immunopharma, Inc.

Ticker: $LYEL

Transaction Value

$25.0M

Price/Share: $10.77

transaction date

2026-11-04

Shares: 2,321,262

Market Price Activity

HillSignal AI Analytical Report

SEC Form 4 documents direct changes in beneficial ownership of securities for public corporations. The reporting insider, ARCH Venture Partners IX, LLC, holds the title of 10% Owner at Lyell Immunopharma, Inc..

On 2026-11-04, the insider transacted 2,321,262 shares.The shares were transacted at a weighted average price of $10.77 per share, resulting in a total market-relevant value of $25.0M.

Executive Summary Summary

ARCH Venture Partners IX, LLC (10% Owner) bought $25.0M of $LYEL

Post-Transaction Position: 3,747,790 shares

SEC Accession No: 0001012975-26-001014 (CIK: 1723174)

Verified Multi-Source Index

Verify the accuracy of this insider transaction and corporate entity independently. HillSignal pulls data directly from official SEC databases; use the sources below to corroborate.

SEC EDGAR FilingView Source Form 4

Yahoo Finance$LYEL Quote & Profile

OpenCorporates RegistryVerify Corporate Identity

Google News$LYEL News Coverage