ARCH Venture Partners XII, LLC
SEC insider (Form 3/4/5 filer). CIK 0001979548. 10% Owner at CITY THERAPEUTICS, INC. (CTY) and 4 other issuers. 15 reported Form 4/5 transactions since Sep 2024; latest on Oct 19, 2026. Located in CHICAGO, IL.
Companies ARCH Venture Partners XII, LLC has filed insider reports for
- CITY THERAPEUTICS, INC. (CTY): 10% Owner
- Seaport Therapeutics, Inc. (SPTX): 10% Owner
- Metsera, Inc. (MTSR): 10% Owner
- Neumora Therapeutics, Inc. (NMRA): 10% Owner
- Prime Medicine, Inc. (PRME): 10% Owner
ARCH Venture Partners XII, LLC
CIK: 0001979548
Transaction Breakdown
High conviction signal
Position reduction
Derivative conversions
Compensation grants
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (15 total)
- Oct 19, 2026CTY
CITY THERAPEUTICS, INC.
ConversionIndirect3.3M shares- - Oct 19, 2026CTY
CITY THERAPEUTICS, INC.
PurchaseIndirect170K shares at avg. $18.00$3.1M - Oct 19, 2026CTY
CITY THERAPEUTICS, INC.
ConversionIndirect2M shares- - Oct 19, 2026CTY
CITY THERAPEUTICS, INC.
ConversionIndirect5.5M shares- - May 4, 2026SPTX
Seaport Therapeutics, Inc.
PurchaseIndirect1.1M shares at avg. $18.00$19.8M - May 4, 2026SPTX
Seaport Therapeutics, Inc.
ConversionIndirect2.5M shares- - May 4, 2026SPTX
Seaport Therapeutics, Inc.
ConversionIndirect2.7M shares- - Nov 13, 2025MTSR
Metsera, Inc.
DispositionIndirect18.5M shares- - Nov 13, 2025MTSR
Metsera, Inc.
DispositionIndirect8.3M shares- - Oct 27, 2025NMRA
Neumora Therapeutics, Inc.
PurchaseIndirect1.9M shares at avg. $2.61$5.0M
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Oct 19, 2026 |  CTY CITY THERAPEUTICS, INC. | Conversion | 3,294,900 | - | $0 | Indirect |
| Oct 19, 2026 | CTY CITY THERAPEUTICS, INC. | Purchase | 170,000 | $18.00 | $3,060,000 | Indirect |
| Oct 19, 2026 | CTY CITY THERAPEUTICS, INC. | Conversion | 2,027,006 | - | $0 | Indirect |
| Oct 19, 2026 | CTY CITY THERAPEUTICS, INC. | Conversion | 5,482,309 | - | $0 | Indirect |
| May 4, 2026 |  SPTX Seaport Therapeutics, Inc. | Purchase | 1,100,000 | $18.00 | $19,800,000 | Indirect |
| May 4, 2026 | SPTX Seaport Therapeutics, Inc. | Conversion | 2,513,686 | - | $0 | Indirect |
| May 4, 2026 | SPTX Seaport Therapeutics, Inc. | Conversion | 2,681,265 | - | $0 | Indirect |
| Nov 13, 2025 |  MTSR Metsera, Inc. | Disposition | 18,503,128 | - | - | Indirect |
| Nov 13, 2025 | MTSR Metsera, Inc. | Disposition | 8,313,680 | - | - | Indirect |
| Oct 27, 2025 |  NMRA Neumora Therapeutics, Inc. | Purchase | 1,915,700 | $2.61 | $4,999,977 | Indirect |
1-10 of 15 transactions