Diameter Offshore Fund LP
Diameter Offshore Fund LP is a hedge fund based in George Town, Cayman Islands. According to its most recent Form D, filed Nov 14, 2025, the fund has sold $1,356,565,895 of interests to 126 investors since its first sale in Sep 2017. The minimum investment it accepts from an outside investor is $100,000. 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. Related persons named in the filing include Diameter Capital Partners LP; Jonathan Lewinsohn; Diameter Associates LLC.
Performance
No verified returns have been reported for this fund. As a rough guide, Diameter Capital Partners LP, which manages it, disclosed U.S. stock holdings that returned an estimated +0.8% 2026 YTD through Jun 30 (S&P 500: +9.5%), based only on its public 13F filings. Over a longer period, Q3 2024 to Q2 2026, the estimate is +191.6% (S&P 500: +37.2%).
This estimate covers the firm's whole disclosed long U.S. stock portfolio. It is not this fund's return and excludes dividends, fees, shorts, derivatives, bonds, cash and trading within each quarter.
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- Total raised
- $1,356,565,895Cumulative sales reported on Form D
- Investors
- 126
- First sale
- Sep 1, 2017
- Minimum investment
- $100,000
- Who can invest
- Qualified purchasersSection 3(c)(7): generally $5M+ in investments
- Offering exemption
- Rule 506(b)No general advertising
- Key people and entities
- Diameter Capital Partners LP; Jonathan Lewinsohn; Diameter Associates LLC
- Latest Form D
- Nov 14, 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. Private funds are speculative, illiquid and generally limited to accredited investors or qualified purchasers. Full disclosures · Request a correction
Questions about Diameter Offshore Fund LP
What is the minimum investment for Diameter Offshore Fund LP?
According to its latest Form D, filed Nov 14, 2025, the minimum investment Diameter Offshore Fund LP accepts from an outside investor is $100,000.
Who can invest in Diameter Offshore Fund LP?
Diameter Offshore Fund LP 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 Diameter Offshore Fund LP raised?
Diameter Offshore Fund LP reports $1,356,565,895 sold from 126 investors on its Form D filed Nov 14, 2025. This is cumulative sales since the offering began, not current assets or performance.
Where is Diameter Offshore Fund LP based?
Diameter Offshore Fund LP is based in George Town, Cayman Islands and is managed by Diameter Capital Partners LP.
When did Diameter Offshore Fund LP launch?
Diameter Offshore Fund LP reports its first sale in Sep 2017.
Size compared with every hedge fund
Raised more than 90% of the 2,363 hedge funds based in Cayman Islands, and more than 92% of all 10,308 that report sales.