SEC Insider Transactions from Wellington Biomedical Innovation Master Investors (Cayman) II L.P..

Last updated: 2026-03-14 10:42 UTC | Total transactions: 8

Wellington Biomedical Innovation Master Investors (Cayman) II L.P. has filed 8 insider transactions across 3 companies since September 2024.

Most recent transaction: a transaction of 1857699 shares of Metsera, Inc. ($MTSR) on January 30, 2025.

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Transaction Date Company Ticker Insider Name Title Transaction Type Security Shares Price Shares Owned Following Total Shares Outstanding % of Owned % of Outstanding
Jan. 30, 2025 Metsera, Inc. $MTSR Wellington Biomedical Innovation Master Investors (Cayman) II L.P. Not found C Common Stock 1857699 $0.00 1,857,699.0000 0 9999.99% 0.00%
Jan. 30, 2025 Metsera, Inc. $MTSR Wellington Biomedical Innovation Master Investors (Cayman) II L.P. Not found C Series B Preferred Stock 4365079 $0.00 0.0000 0 100.00% 0.00%
Oct. 15, 2024 Upstream Bio, Inc. $UPB Wellington Biomedical Innovation Master Investors (Cayman) II L.P. Not found C Series B redeemable convertible preferred stock 852940 $0.00 0.0000 0 100.00% 0.00%
Oct. 15, 2024 Upstream Bio, Inc. $UPB Wellington Biomedical Innovation Master Investors (Cayman) II L.P. Not found C Common Stock 894733 $0.00 894,733.0000 0 9999.99% 0.00%
Sept. 16, 2024 MBX Biosciences, Inc. $MBX Wellington Biomedical Innovation Master Investors (Cayman) II L.P. Not found C Series B Preferred Stock 16666666 $0.00 0.0000 0 100.00% 0.00%
Sept. 16, 2024 MBX Biosciences, Inc. $MBX Wellington Biomedical Innovation Master Investors (Cayman) II L.P. Not found C Common Stock 403787 $0.00 1,790,122.0000 0 29.13% 0.00%
Sept. 16, 2024 MBX Biosciences, Inc. $MBX Wellington Biomedical Innovation Master Investors (Cayman) II L.P. Not found C Common Stock 1386335 $0.00 1,386,335.0000 0 9999.99% 0.00%
Sept. 16, 2024 MBX Biosciences, Inc. $MBX Wellington Biomedical Innovation Master Investors (Cayman) II L.P. Not found C Series C Preferred Stock 4854368 $0.00 0.0000 0 100.00% 0.00%