Sei IX, LLC is a private equity fund based in Marina Del Rey, California. According to its most recent Form D, filed May 13, 2026, it has sold $49,000,000 of interests to 46 investors since its first sale in Apr 2026. The minimum investment it accepts from an outside investor is $32,000. It relies on the Section 3(c)(7) exclusion, so investors generally must be qualified purchasers. 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 Robert Seidler; Matt Seidler; Eric Kutsenda.
- Total raised
- $49,000,000Cumulative sales reported on Form D
- Investors
- 46
- First sale
- Apr 30, 2026
- Minimum investment
- $32,000
- Who can invest
- Qualified purchasersSection 3(c)(7): generally $5M+ in investments
- Offering exemption
- Rule 506(b)No general advertising
- Key people and entities
- Robert Seidler; Matt Seidler; Eric Kutsenda
- Latest Form D
- May 13, 2026
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 Sei IX, LLC
What is the minimum investment for Sei IX, LLC?
According to its latest Form D, filed May 13, 2026, the minimum investment Sei IX, LLC accepts from an outside investor is $32,000.
Who can invest in Sei IX, LLC?
Sei IX, LLC is generally open only to qualified purchasers (generally individuals with at least $5 million in investments), because it relies on Section 3(c)(7). It uses Rule 506(b), which does not allow general advertising.
How much has Sei IX, LLC raised?
Sei IX, LLC reports $49,000,000 sold from 46 investors on its Form D filed May 13, 2026. This is cumulative sales since the offering began, not current assets or performance.
Where is Sei IX, LLC based?
Sei IX, LLC is based in Marina Del Rey, California.
When did Sei IX, LLC launch?
Sei IX, LLC reports its first sale in Apr 2026, 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 private equity fund
Raised more than 82% of the 1,777 private equity funds based in California, and more than 63% of all 9,142 that report sales.