Form D · Other Investment Fund

Sounion PSI Master Fund LP

Grand Cayman, E9 · CIK 0002105504

Offering snapshot reported Jan 20, 2026 · SEC filing

Reported sold: $2.5M
Investors reported: 1
Minimum accepted: $100K
First sale: Jan 2, 2026

What changed?

Latest filing versus its linked predecessor, where available.

No comparable changes in the displayed metrics.

Filing history

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Filed	Filing type	Reported sold	Change vs linked filing	Investors	Source
Jan 20, 2026	Initial	$2,500,000	No comparison	1	SEC filing

Offering details

Securities: Pooled investment fund
Exemptions: 06b, 3C, 3C.7
Duration over one year: Yes
Business combination: No

Sales commissions: $0
Finders' fees: $0
Form D file number: 021-570360

Source: Form D, filed Jan 20, 2026. Minimum accepted may differ from a standard advertised minimum.

Fund connections

The linked fund shows its most recently reported ADV details.

Matched by reported Form D file number

SOUNION PSI MASTER FUND LP

Investment adviser: SOUNION CAPITAL MANAGEMENT, LLC

Gross asset value: $64M
Beneficial owners: 5
ADV minimum commitment: $250K

Reported in Form ADV on Mar 27, 2026. Fund assets and beneficial owners measure different things from Form D sales and investors.

Service providers

Fund administrator NAV FUND SERVICES OAKBROOK TERRACE, Illinois, United States Investor statements: Yes (provided to all investors) Related to adviser: No

Auditor SPICER JEFFRIES (CAYMAN) GRAND CAYMAN, Cayman Islands

Custodian MAREX PRIME SERVICES LIMITED LONDON, United Kingdom Related to adviser: No

Prime broker MAREX PRIME SERVICES LIMITED LONDON, United Kingdom

Provider details

Annual audit: Yes
Prime brokers: Yes
Custodians: Yes
Administrator other than the adviser: Yes
External marketing: No

MAREX PRIME SERVICES LIMITED
LEI 5493003EETVWYSIJ5A20

Filing source

Form ADV 2073312 · Mar 27, 2026 · Schedule D 7.B.(1), fund 805-9969029564

Official IAPD profile (latest public filing). Values are the most recently reported in our imported data; the public profile may show a newer filing.

People & organizations

Current and past Form D appearances. These existing records do not establish a person's current role or uniquely identify them across issuers.

People and organizations reported in Form D filings
Name	Reported role
Mark Longtin	Director
Pak Lui	Director
N/A Sounion Capital Management, Llc	Promoter
N/A Sounion General Partner Llc	Promoter
Christopher Wong	Director

Issuer details

Industry: Pooled Investment Fund (See others in industry)

Address:

C/O Walkers Corporate Limited 190 Elgin Avenue, George Town
Grand Cayman, E9, KY1-9008