Fund family · SEC Form D record
West Street Life Sciences funds
West Street Life Sciences has 4 vehicles on the SEC Form D record, in 2 numbered generations, filed from 2023 to 2025. The newest is West Street Life Sciences II LP, first filed Dec 18, 2025.
- Vehicles
- 4
- Numbered generations
- 2
- First filing
- 2023
- Latest filing
- Dec 18, 2025
Names, dates and status as filed on SEC EDGAR. A Form D is a notice of an exempt offering; the SEC does not review or approve it. Grouped by name; see the last question below.
Fund II
2 vehicles · first filed
| Vehicle | Sleeve | First filed | Latest filing | Filing record | SEC |
|---|---|---|---|---|---|
| West Street Life Sciences II LPCIK 2098939 | First sale yet to occur | EDGAR | |||
| West Street Life Sciences II Offshore LPCIK 2098958 | First sale yet to occur | EDGAR |
Sold to date and investors
Unlock in the terminal (Investor)Fund I
1 vehicle · first filed
| Vehicle | Sleeve | First filed | Latest filing | Filing record | SEC |
|---|---|---|---|---|---|
| West Street Life Sciences I, L.P.CIK 1951154 | Annual amendment overdue | EDGAR |
Sold to date and investors
Unlock in the terminal (Investor)Unnumbered
1 vehicle · first filed
| Vehicle | Sleeve | First filed | Latest filing | Filing record | SEC |
|---|---|---|---|---|---|
| West Street Life Sciences I Offshore, L.P.CIK 1951189 | Annual amendment overdue | EDGAR |
Sold to date and investors
Unlock in the terminal (Investor)Questions about the West Street Life Sciences funds
- How many West Street Life Sciences funds are there?
- The SEC Form D record shows 4 vehicles in 2 numbered generations, the earliest filed Jan 11, 2023 and the latest filing on Dec 18, 2025. By generation: Fund II (2 vehicles, first filed Dec 18, 2025); Fund I (West Street Life Sciences I, L.P., first filed Jan 11, 2023).
- What is the latest West Street Life Sciences fund?
- West Street Life Sciences II LP, which first filed a Form D on Dec 18, 2025. Its own page carries the filed terms, the people named on the form and every filing on EDGAR.
- Who is the adviser to the West Street Life Sciences funds?
- AltStreet has not joined a Form ADV adviser to this family's Form D filings. The adviser, if any, appears in each fund's offering documents, which a Form D does not include.
- How much have the West Street Life Sciences funds raised?
- Each vehicle reports an amount sold and an investor count on its latest Form D or amendment, and those figures are on each vehicle's entity page. The totals by generation are in the AltStreet Terminal (Investor), where master and parallel sleeves that report one family-wide figure are counted once.
- How does AltStreet group these funds into a family?
- By name: the base name minus the fund number, sleeve letters, jurisdiction and legal form, read from each issuer's Form D (lib/edgar/fundFamilies.ts). 'Fund IV' is generation 4; a vehicle whose name carries no number is listed as unnumbered. It is a name-based grouping, not a statement of common control; the filings on each entity page show the related persons as filed.