| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| ARCH Venture Partners IX, LLC | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | ARCH Venture Partners IX, LLC, By: /s/ Mark McDonnell, as Attorney-in-Fact for Robert Nelsen, Managing Director | 2025-07-29 | 0001723174 |
| ARCH Venture Partners IX, L.P. | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | ARCH Venture Partners IX, L.P., By: ARCH Venture Partners IX, LLC, its General Partner, By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director | 2025-07-29 | 0001723173 |
| ARCH Venture Partners IX Overage, L.P. | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | ARCH Venture Partners IX Overage, L.P., By: ARCH Venture Partners IX, LLC, its General Partner, By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director | 2025-07-29 | 0001723172 |
| ARCH Venture Fund IX, L.P. | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | ARCH Venture Fund IX, L.P., By: ARCH Venture Partners IX, L.P., its General Partner, By: ARCH Venture Partners IX, LLC, its General Partner, By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director | 2025-07-29 | 0001666306 |
| ARCH Venture Fund IX Overage, L.P. | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | ARCH Venture Fund IX Overage, L.P., By: ARCH Venture Partners IX Overage, L.P., its General Partner, By: ARCH Venture Partners IX, LLC, its General Partner, By: /s/ Mark McDonnell, as Attorney-in-Fact for Keith Crandell, Managing Director | 2025-07-29 | 0001666307 |
| CRANDELL KEITH | 10%+ Owner | C/O ARCH VENTURE PARTNERS IX, LLC, 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | Keith Crandell, Managing Director, By: /s/ Mark McDonnell, as Attorney-in-Fact | 2025-07-29 | 0001219039 |
| BYBEE CLINTON | 10%+ Owner | C/O ARCH VENTURE PARTNERS IX, LLC, 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | Clinton Bybee, Managing Director, By: /s/ Mark McDonnell, as Attorney-in-Fact | 2025-07-29 | 0001219043 |
| NELSEN ROBERT | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | Robert Nelsen, Managing Director, By: /s/ Mark McDonnell, as Attorney-in-Fact | 2025-07-29 | 0001219042 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | LYEL | Common Stock | 910K | Jul 25, 2025 | By ARCH Venture Fund IX, L.P. | F1, F3 | |||||
| holding | LYEL | Common Stock | 910K | Jul 25, 2025 | By ARCH Venture Fund IX Overage, L.P. | F2, F3 |
| Id | Content |
|---|---|
| F1 | 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. |
| F2 | 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. |
| F3 | The amount of shares reported herein reflects a 1-for-20 reverse stock split that occurred on May 27, 2025. |
Due to overlapping managing directors, a separate Form 3 was filed for the purchase of common stock of Lyell by ARCH Venture Fund XIII, L.P., and related entities: ARCH Venture Partners XIII, L.P., ARCH Venture Partners XIII, LLC, Steven Gillis, Kristina Burow and Paul Berns.