Wellington Biomedical Innovation Master Investors (Cayman) II L.P.

Ten-percent owner · AVLN, MTSR

As of 2026-09-16, Wellington Biomedical Innovation Master Investors (Cayman) II L.P. has 7 Form 4 transactions on record across 2 companies — 4 in the trailing 12 months.

Everything this person has disclosed to the SEC on Form 4 — across every company they file for — reconstructed from the public record. A filing history, not a tip sheet.

Reconstructed holdings

Direct: $175.2MIndirect: $0$175.2Mas of 2026-09-16
  • Direct $175.2M
  • Indirect $0
MTSRdirect1,857,699 sh$131.0M
AVLNdirect1,275,486 sh$44.3M

Reconstructed from this person's own Form 4 filings — the total each filing reported owning afterward, priced at the close on the as-of date shown. A filed position can lag the real one.

Direct and indirect holdings (e.g. through a trust or fund) are tagged separately, as filed.

Trades by company

AVLN · 4 trades
2026-05-01: Conversion, 20,482,289 sh ($0)2026-05-01: Conversion, 4,060,259 sh ($0)2026-05-01: Conversion, 1,275,486 sh2026-05-01: Conversion, 1,275,486 sh
MTSR · 3 trades
2025-01-30: Conversion, 4,365,079 sh ($0)2025-01-30: Conversion, 1,857,699 sh2025-01-30: Conversion, 1,857,699 sh

Filing ledger

DateCompanyActionShares @ priceValueOwnership ΔOwned afterFiling
7 award / exercise / gift records — not counted as purchases
DateCompanyActionSharesOwned afterFiling
2026-05-01AVLNConversion20,482,2890Form 4
2026-05-01AVLNConversion4,060,2590Form 4
2026-05-01AVLNConversion1,275,4861,275,486Form 4
2026-05-01AVLNConversion1,275,4861,275,486Form 4
2025-01-30MTSRConversion4,365,0790Form 4
2025-01-30MTSRConversion1,857,6991,857,699Form 4
2025-01-30MTSRConversion1,857,6991,857,699Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.