Alpha Sentinel Associates LLC
Alpha Sentinel Associates LLC is a venture capital fund based in New York, New York. According to its most recent Form D, filed Nov 26, 2025, it has sold $13,378,590 of interests to 42 investors since its first sale in Sep 2023. The minimum investment it accepts from an outside investor is $10,000. It relies on the Section 3(c)(1) exclusion, which limits it to 100 beneficial owners, typically accredited investors. The offering uses Rule 506(b), which does not permit general solicitation. Based on its first sale date and the amount raised, AltMountain classifies it as an emerging manager. Related persons named in the filing include Sean O'Brien; Stephen Brotman; Alpha Partners Management LLC.
- Total raised
- $13,378,590Cumulative sales reported on Form D
- Investors
- 42
- First sale
- Sep 7, 2023
- Minimum investment
- $10,000
- Who can invest
- Accredited investorsSection 3(c)(1): up to 100 beneficial owners
- Offering exemption
- Rule 506(b)No general advertising
- Key people and entities
- Sean O'Brien; Stephen Brotman; Alpha Partners Management LLC
- Latest Form D
- Nov 26, 2025
From SEC filings, not verified. This page republishes the fund's Form D as filed. It is not an offer, solicitation or recommendation, and AltMountain has not reviewed the fund. “Raised” is cumulative sales, not current assets or performance. Returns are not part of SEC filings. Private funds are speculative, illiquid and generally limited to accredited investors or qualified purchasers. Full disclosures · Request a correction
Questions about Alpha Sentinel Associates LLC
What is the minimum investment for Alpha Sentinel Associates LLC?
According to its latest Form D, filed Nov 26, 2025, the minimum investment Alpha Sentinel Associates LLC accepts from an outside investor is $10,000.
Who can invest in Alpha Sentinel Associates LLC?
Alpha Sentinel Associates LLC is generally open only to accredited investors, and it may have no more than 100 beneficial owners because it relies on Section 3(c)(1). It uses Rule 506(b), which does not allow general advertising.
How much has Alpha Sentinel Associates LLC raised?
Alpha Sentinel Associates LLC reports $13,378,590 sold from 42 investors on its Form D filed Nov 26, 2025. This is cumulative sales since the offering began, not current assets or performance.
Where is Alpha Sentinel Associates LLC based?
Alpha Sentinel Associates LLC is based in New York, New York and is managed by Alpha Partners Management, LLC.
When did Alpha Sentinel Associates LLC launch?
Alpha Sentinel Associates LLC reports its first sale in Sep 2023, which makes it an emerging manager by AltMountain's definition (first sale in 2021 or later and under $50 million raised).
Size compared with every venture capital fund
Raised more than 81% of the 1,252 venture capital funds based in New York, and more than 90% of all 15,160 that report sales.