AltMountain

Lone Sierra, L.P.

Greenwich, CT · CIK 1315598 · Managed by Lone Pine Capital LLC

Lone Sierra, L.P. is a hedge fund based in Greenwich, Connecticut. According to its most recent Form D, filed Mar 6, 2026, the fund has sold $564,370,408 of interests to 139 investors since its first sale in Jan 2005. The filing does not set a minimum investment. 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 Lone Pine Managing Member LLC; Lone Pine Members LLC; Lone Pine Capital LLC.

Performance

13F estimate · public data only

No verified returns have been reported for this fund. As a rough guide, Lone Pine Capital LLC, which manages it, disclosed U.S. stock holdings that returned an estimated +14.9% 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 +65.4% (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
$564,370,408Cumulative sales reported on Form D
Investors
139
First sale
Jan 1, 2005
Minimum investment
None set
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
Lone Pine Managing Member LLC; Lone Pine Members LLC; Lone Pine Capital LLC
Latest Form D
Mar 6, 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 Lone Sierra, L.P.

What is the minimum investment for Lone Sierra, L.P.?

Lone Sierra, L.P.'s latest Form D, filed Mar 6, 2026, does not set a minimum investment. Managers can still require one in the offering documents.

Who can invest in Lone Sierra, L.P.?

Lone Sierra, L.P. 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 Lone Sierra, L.P. raised?

Lone Sierra, L.P. reports $564,370,408 sold from 139 investors on its Form D filed Mar 6, 2026. This is cumulative sales since the offering began, not current assets or performance.

Where is Lone Sierra, L.P. based?

Lone Sierra, L.P. is based in Greenwich, Connecticut and is managed by Lone Pine Capital LLC.

When did Lone Sierra, L.P. launch?

Lone Sierra, L.P. reports its first sale in Jan 2005.

Size compared with every hedge fund

Raised more than 89% of the 862 hedge funds based in Connecticut, and more than 83% of all 10,308 that report sales.

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