Skip to contentWellington Biomedical Innovation Master Investors (Cayman) II L.P. — MBX Biosciences, Inc. insider: 15 transactions · InsiderLensWellington Biomedical Innovation Master Investors (Cayman) II L.P.
- 10% owner at RayzeBio, Inc. · on record since Sep 19, 2023
- 10% owner at CARGO Therapeutics, Inc. · on record since Nov 16, 2023
- 10% owner at MBX Biosciences, Inc. · on record since Sep 17, 2024
- 10% owner at Upstream Bio, Inc. · on record since Oct 15, 2024
- 10% owner at Metsera, Inc. · on record since Jan 30, 2025
- 10% owner at Avalyn Pharma Inc. · on record since Apr 29, 2026
Insider trading activity of Wellington Biomedical Innovation Master Investors (Cayman) II L.P.
- Transactions on record
- 15
- since Sep 19, 2023
- Open-market buys
- 0
- Open-market sells
- 0
- Companies traded
- 6
- last filing May 1, 2026
Figures computed from official regulatory filings — methodology.
Companies where Wellington Biomedical Innovation Master Investors (Cayman) II L.P. has traded
- Avalyn Pharma Inc.3 tx · May 1, 2026
- Metsera, Inc.2 tx · Feb 3, 2025
- Upstream Bio, Inc.2 tx · Oct 15, 2024
- MBX Biosciences, Inc.4 tx · Sep 17, 2024
- CARGO Therapeutics, Inc.2 tx · Nov 16, 2023
- RayzeBio, Inc.2 tx · Sep 19, 2023
Track record of Wellington Biomedical Innovation Master Investors (Cayman) II L.P.
Insufficient history for a statistical track record (fewer than 5 open-market buys).
Transaction history of Wellington Biomedical Innovation Master Investors (Cayman) II L.P.
Co-insiders of Wellington Biomedical Innovation Master Investors (Cayman) II L.P.
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AKKARAJU SRINIVASCARGO Therapeutics, Inc.
| Company | Filed | Type | Qty | Price | Value · USD | Src |
|---|
| May 1, 2026 | OtherD | -4,060,259 | 0.00 USD | $0 | SEC |
| May 1, 2026 | OtherD | -20,482,289 | 0.00 USD | $0 | SEC |
| May 1, 2026 | Other | 1,275,486 | — | — | SEC |
| Feb 3, 2025 | Other | 1,857,699 | — | — | SEC |
| Feb 3, 2025 | OtherD | -4,365,079 | 0.00 USD | $0 | SEC |
| Oct 15, 2024 | OtherD | -852,940 | 0.00 USD | $0 | SEC |
| Oct 15, 2024 | Other | 894,733 | — | — | SEC |
| Sep 17, 2024 | OtherD | -16,666,666 | 0.00 USD | $0 | SEC |
| Sep 17, 2024 | Other | 403,787 | — | — | SEC |
| Sep 17, 2024 | Other | 1,386,335 | — | — | SEC |
| Sep 17, 2024 | OtherD | -4,854,368 | 0.00 USD | $0 | SEC |
| Nov 16, 2023 | Other | 737,000 | — | — | SEC |
| Nov 16, 2023 | OtherD | -10,000,000 | 0.00 USD | $0 | SEC |
| Sep 19, 2023 | OtherD | -1,557,846 | 0.00 USD | $0 | SEC |
| Sep 19, 2023 | Other | 1,557,846 | — | — | SEC |