AltMountain

Casdin Partners Offshore, Ltd.

George Town, Grand Cayman, Cayman Islands · CIK 1710123 · Managed by Casdin Capital, LLC
Offshore

Casdin Partners Offshore, Ltd. is a hedge fund based in George Town, Grand Cayman, Cayman Islands. According to its most recent Form D, filed Mar 13, 2026, the fund has sold $1,178,270,590 of interests to 134 investors since its first sale in Jul 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 Ronan Guilfoyle; Andrew Malik; Eli Casdin.

Performance

13F estimate · public data only

No verified returns have been reported for this fund. As a rough guide, Casdin Capital, LLC, which manages it, disclosed U.S. stock holdings that returned an estimated +19.1% 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 +72.8% (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.

Is this your fund? Report your monthly returns · How performance works

Total raised
$1,178,270,590Cumulative sales reported on Form D
Investors
134
First sale
Jul 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
Ronan Guilfoyle; Andrew Malik; Eli Casdin
Latest Form D
Mar 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. Private funds are speculative, illiquid and generally limited to accredited investors or qualified purchasers. Full disclosures · Request a correction

Questions about Casdin Partners Offshore, Ltd.

What is the minimum investment for Casdin Partners Offshore, Ltd.?

According to its latest Form D, filed Mar 13, 2026, the minimum investment Casdin Partners Offshore, Ltd. accepts from an outside investor is $100,000.

Who can invest in Casdin Partners Offshore, Ltd.?

Casdin Partners Offshore, Ltd. 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 Casdin Partners Offshore, Ltd. raised?

Casdin Partners Offshore, Ltd. reports $1,178,270,590 sold from 134 investors on its Form D filed Mar 13, 2026. This is cumulative sales since the offering began, not current assets or performance.

Where is Casdin Partners Offshore, Ltd. based?

Casdin Partners Offshore, Ltd. is based in George Town, Grand Cayman, Cayman Islands and is managed by Casdin Capital, LLC.

When did Casdin Partners Offshore, Ltd. launch?

Casdin Partners Offshore, Ltd. reports its first sale in Jul 2017.

Size compared with every hedge fund

Raised more than 88% of the 2,363 hedge funds based in Cayman Islands, and more than 91% of all 10,308 that report sales.

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