Fund family · SEC Form D record
Longtail Bio Fund funds
Longtail Bio Fund has 16 vehicles on the SEC Form D record, in 2 numbered generations, filed from 2021 to 2026. The newest is EN Fund II, a series of Longtail Bio Fund, LP, first filed Mar 14, 2022.
- Vehicles
- 16
- Numbered generations
- 2
- First filing
- 2021
- Latest filing
- Oct 16, 2026
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 · latest filing
| Vehicle | Sleeve | First filed | Latest filing | Filing record | SEC |
|---|---|---|---|---|---|
| EN Fund II, a series of Longtail Bio Fund, LPCIK 1916837 | Sold the stated amount | EDGAR | |||
| TA-0818 Fund II, a series of Longtail Bio Fund, LPCIK 2153744 | Sold the stated amount | EDGAR |
Sold to date and investors
Unlock in the terminal (Investor)Fund I
14 vehicles · first filed · latest filing
Sold to date and investors
Unlock in the terminal (Investor)Questions about the Longtail Bio Fund funds
- How many Longtail Bio Fund funds are there?
- The SEC Form D record shows 16 vehicles in 2 numbered generations, the earliest filed Apr 7, 2021 and the latest filing on Oct 16, 2026. By generation: Fund II (2 vehicles, first filed Mar 14, 2022); Fund I (14 vehicles, first filed Apr 7, 2021).
- What is the latest Longtail Bio Fund fund?
- EN Fund II, a series of Longtail Bio Fund, LP, which first filed a Form D on Mar 14, 2022. Its own page carries the filed terms, the people named on the form and every filing on EDGAR.
- Who is the adviser to the Longtail Bio Fund 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 Longtail Bio Fund 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.