Sio Partners LP
Sio Partners LP is a hedge fund based in New York, New York. According to its most recent Form D, filed Feb 19, 2026, the fund has sold $478,358,414 of interests to 193 investors since its first sale in Jun 2006. The minimum investment it accepts from an outside investor is $1,000,000. 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. Related persons named in the filing include Sio GP, LLC; Michael Castor; Sio Capital Management, LLC.
Performance
No verified returns have been reported for this fund. As a rough guide, SIO Capital Management, LLC, which manages it, disclosed U.S. stock holdings that returned an estimated +17.3% 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 +50.9% (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
- $478,358,414Cumulative sales reported on Form D
- Investors
- 193
- First sale
- Jun 5, 2006
- Minimum investment
- $1,000,000
- 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
- Sio GP, LLC; Michael Castor; Sio Capital Management, LLC
- Latest Form D
- Feb 19, 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 Sio Partners LP
What is the minimum investment for Sio Partners LP?
According to its latest Form D, filed Feb 19, 2026, the minimum investment Sio Partners LP accepts from an outside investor is $1,000,000.
Who can invest in Sio Partners LP?
Sio Partners LP 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 Sio Partners LP raised?
Sio Partners LP reports $478,358,414 sold from 193 investors on its Form D filed Feb 19, 2026. This is cumulative sales since the offering began, not current assets or performance.
Where is Sio Partners LP based?
Sio Partners LP is based in New York, New York and is managed by SIO Capital Management, LLC.
When did Sio Partners LP launch?
Sio Partners LP reports its first sale in Jun 2006.
Size compared with every hedge fund
Raised more than 79% of the 2,544 hedge funds based in New York, and more than 81% of all 10,307 that report sales.