| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| ARCH Venture Partners X, LLC | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | /s/ ARCH Venture Fund X, L.P., By: ARCH Venture Partners X, L.P., its General Partner, By: ARCH Venture Partners X, LLC, its General Partner, By: Mark McDonnell, attorney-in-fact | 01 Aug 2025 | 0001769012 |
| ARCH Venture Partners X, L.P. | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | /s/ ARCH Venture Fund X Overage, L.P., By: ARCH Venture Partners X Overage, L.P., its General Partner, By: ARCH Venture Partners X, LLC, its General Partner, By: Mark McDonnell, attorney-in-fact | 01 Aug 2025 | 0001782583 |
| ARCH Venture Partners X Overage, L.P. | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | /s/ ARCH Venture Partners X, L.P., By: ARCH Venture Partners X, LLC, its General Partner, By: Mark McDonnell, attorney-in-fact | 01 Aug 2025 | 0001768905 |
| ARCH Venture Fund X, L.P. | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | /s/ ARCH Venture Partners X Overage, L.P., By: ARCH Venture Partners X, LLC, its General Partner, By: Mark McDonnell, attorney-in-fact | 01 Aug 2025 | 0001757011 |
| ARCH Venture Fund X Overage, L.P. | 10%+ Owner | 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | /s/ ARCH Venture Partners X, LLC, By: Mark McDonnell, attorney-in-fact | 01 Aug 2025 | 0001757017 |
| CRANDELL KEITH | 10%+ Owner | C/O ARCH VENTURE PARTNERS IX, LLC, 8755 W. HIGGINS ROAD, SUITE 1025, CHICAGO | /s/ Keith Crandell, By: Mark McDonnell, attorney-in-fact | 01 Aug 2025 | 0001219039 |
| Burow Kristina | 10%+ Owner | 8755 W. HIGGINS ROAD,SUITE 1025, CHICAGO | /s/ Kristina Burow, By: Mark McDonnell, attorney-in-fact | 01 Aug 2025 | 0001569248 |
| GILLIS STEVEN | 10%+ Owner | C/O ARCH VENTURE PARTNERS, 8755 WEST HIGGINS ROAD, SUITE 1025, CHICAGO | /s/ Steven Gillis, By: Mark McDonnell, attorney-in-fact | 01 Aug 2025 | 0001229592 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | PRME | Common Stock | Purchase | $9,999,990 | +3,030,300 | +95% | $3.30 | 6,230,300 | 01 Aug 2025 | By ARCH Venture Fund XII, L.P. | F4 |
| holding | PRME | Common Stock | 6,128,297 | 01 Aug 2025 | By ARCH Venture Fund X, L.P. | F1, F3 | |||||
| holding | PRME | Common Stock | 6,128,297 | 01 Aug 2025 | By ARCH Venture Fund X Overage, L.P. | F2, F3 |
| Id | Content |
|---|---|
| F1 | Represents shares held directly by ARCH Venture Fund X, L.P. ("ARCH X"). ARCH Venture Partners X, L.P. ("AVP X LP") is the sole general partner of ARCH X. |
| F2 | Represents shares held directly by ARCH Venture Fund X Overage, L.P. ("ARCH X Overage"). ARCH Venture Partners X Overage, L.P. ("AVP X Overage LP") is the sole general partner of ARCH X Overage. |
| F3 | ARCH Venture Partners X, LLC ("AVP X LLC") is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP X LLC (the "AVP X Committee Members"). AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members each disclaim beneficial ownership except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that such shares are beneficially owned by them for Section 16 or any other purpose. |
| F4 | Represents shares held directly by ARCH Venture Fund XII, L.P. ("ARCH XII"). ARCH Venture Partners XII, L.P. ("AVP XII LP") is the general partner of ARCH XII. ARCH Venture Partners XII, LLC ("AVP XII LLC") is the general partner of AVP XII LP. Keith Crandell, Kristina Burow and Steven Gillis are members of the investment committee of AVP XII LLC (the "AVP XII LLC Committee Members"). Each of AVP XII LP and AVP XII LLC may be deemed to beneficially own the shares held by ARCH XII, and each of the AVP XII LLC Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH XII. Each of AVP XII LP, AVP XII LLC and the AVP XII LLC Committee Members disclaims beneficial ownership except to the extent of their pecuniary interest therein, if any. |
This Form 4 is one of two reports relating to the same transaction being filed jointly by ARCH X, AVP X LP, ARCH X Overage, AVP X Overage LP, AVP X LLC, ARCH XII, AVP XII LP, AVP XII LLC, Keith Crandell, Kristina Burow and Steven Gillis (collectively, the "Reporting Persons"). Robert Nelsen has direct ownership of Common Stock and is filing his own Form 4 separately.