Abiopharma

🔍 ARCH Venture Partners IX, LLC (Executive)

Company: Lyell Immunopharma, Inc. (LYEL)

Report Date: 2026-03-06

Detailed Transactions and Holdings:

• Acquired 488,090 shares of Common Stock at $25.61 per share (Direct)
  Date: 2026-03-06 | Code: P | equity_swap_involved: 0 | shares_owned_after: 1,426,528.00 | transaction_form_type: 4 | Footnotes: F1
• Holds 0 shares of Common Stock (Direct)
  Date: 2026-03-06 | Code: H | nature_of_ownership: See footnote | shares_owned_after: 910,317.00 | Footnotes: F2
• Holds 0 shares of Common Stock (Direct)
  Date: 2026-03-06 | Code: H | nature_of_ownership: See footnote | shares_owned_after: 910,317.00 | Footnotes: F3

Footnotes:

• F1: These shares are directly held by ARCH Venture Fund XIII, L.P. ("ARCH XIII"). ARCH Venture Partners XIII, L.P. ("AVP XIII LP") is the general partner of ARCH XIII. ARCH Venture Partners XIII, LLC ("AVP XIII LLC") is the general partner of AVP XIII LP. Keith Crandell, Robert Nelsen, Kristina Burow, Paul Berns and Steven Gillis are members of the investment committee of AVP XIII LLC (the "AVP XIII LLC Committee Members"). Each of AVP XIII LP and AVP XIII LLC may be deemed to beneficially own the shares held by ARCH XIII, and each of the AVP XIII LLC Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH XIII. Each of AVP XIII LP, AVP XIII LLC and the AVP XIII LLC Committee Members disclaims beneficial ownership except to the extent of their pecuniary interest therein, if any.
• F2: These shares are directly held by ARCH Venture Fund IX, L.P. ("ARCH IX"). ARCH Venture Partners IX, L.P. ("GPLP"), as the sole general partner of ARCH IX, may be deemed to beneficially own the shares held by ARCH IX. ARCH Venture Partners IX, LLC ("GPLLC"), as the sole general partner of GPLP, may be deemed to beneficially own the shares held by ARCH IX. As managing directors of GPLLC, each of Keith Crandell, Robert Nelsen and Clinton Bybee (the "ARCH Managing Directors"), may be deemed to beneficially own the shares held by ARCH IX. Each of GPLP, GPLLC and the ARCH Managing Directors disclaims beneficial ownership of the securities reported herein, except to the extent of their pecuniary interest therein, if any.
• F3: These shares are directly held by ARCH Venture Fund IX Overage, L.P. ("ARCH Overage"). ARCH Venture Partners IX Overage, L.P. ("Overage GPLP"), as the sole general partner of ARCH Overage, may be deemed to beneficially own the shares held by ARCH Overage. GPLLC, as the sole general partner of Overage GPLP, may be deemed to beneficially own the shares held by ARCH Overage. As managing directors of GPLLC, each of the ARCH Managing Directors may be deemed to beneficially own the shares held by ARCH Overage. Each of Overage GPLP, GPLLC and the ARCH Managing Directors disclaims beneficial ownership of the securities reported herein, except to the extent of their pecuniary interest therein, if any.
• REMARKS: This Form 4 is one of two reports relating to the same transaction being filed jointly by ARCH Venture Partners XIII, LLC, ARCH Venture Partners XIII, L.P., ARCH Venture Fund XIII, L.P., Keith Crandell, Robert Nelsen, Kristina Burow, Steven Gillis, Paul Berns, Clinton Bybee, ARCH Venture Partners IX, LLC, ARCH Venture Partners IX, L.P., ARCH Venture Partners IX Overage, L.P., ARCH Venture Fund IX, L.P. and ARCH Venture Fund IX Overage, L.P.