AltMountain

Long Duration Fund LLC

Los Angeles, CA · CIK 1619603

Long Duration Fund LLC is a hedge fund based in Los Angeles, California. According to its most recent Form D, filed Jun 18, 2026, the fund has sold $225,010,000 of interests to 3 investors since its first sale in Feb 2019. The filing does not set a minimum investment. 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. Related persons named in the filing include David Lindberg; Dan Sommers; Scott Lange.

Performance

No returns have been reported for this fund. Hedge fund returns are not part of SEC filings; managers report them to AltMountain directly.

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Total raised
$225,010,000Cumulative sales reported on Form D
Investors
3
First sale
Feb 1, 2019
Minimum investment
None set
Who can invest
Qualified purchasersSection 3(c)(7): generally $5M+ in investments
Offering exemption
Rule 506(b)No general advertising
Key people and entities
David Lindberg; Dan Sommers; Scott Lange
Latest Form D
Jun 18, 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. Private funds are speculative, illiquid and generally limited to accredited investors or qualified purchasers. Full disclosures · Request a correction

Questions about Long Duration Fund LLC

What is the minimum investment for Long Duration Fund LLC?

Long Duration Fund LLC's latest Form D, filed Jun 18, 2026, does not set a minimum investment. Managers can still require one in the offering documents.

Who can invest in Long Duration Fund LLC?

Long Duration Fund 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 Long Duration Fund LLC raised?

Long Duration Fund LLC reports $225,010,000 sold from 3 investors on its Form D filed Jun 18, 2026. This is cumulative sales since the offering began, not current assets or performance.

Where is Long Duration Fund LLC based?

Long Duration Fund LLC is based in Los Angeles, California.

When did Long Duration Fund LLC launch?

Long Duration Fund LLC reports its first sale in Feb 2019.

Size compared with every hedge fund

Raised more than 78% of the 1,060 hedge funds based in California, and more than 71% of all 10,309 that report sales.

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