DFX Intelligence

Sean O'Sullivan

Sole Memberat Sosv Investments LLC (f/k/a Sosventures LLC)· NJ

As of 2026-09-23 · this person's identity; each section below carries its own date

Current roles: 1
Investments attributed: 0
Board seats: 0

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As of 2026-09-23 · this person's identity; each section below carries its own date

5 additional roles and seats

Every relationship, signal and contact on this record, with the source on each.

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Nothing material in the last 365 days.

Relationship network

9 connected entities

From the roles sources name this person in, the investments a source attributes to them, and the boards and funds Form D names them on.

Some relationships on this record are counted rather than named here. They open with the full profile.

Click any name or line for the investment records and sources behind it. Line weight is investment records together; dashed lines are inferred.

Reading the network

Organization
Fund or vehicle

›How strength and recency are read

Venture relationships are not scored. Each line names its claim: a round led or joined, a board seat or a filing that names the firm, a listing on a portfolio page (dated by when DFX saw it, never by when the investment was made), a disclosed LP commitment, or a co-investor pair counted from observed participations. Observed means a named source says so; Derived means DFX counted it from observed rows; Inferred means a match that may be wrong.

Darker lines were active in the last 24 months or are current; lighter lines are older or undated.

Ask DFX about this network

Which companies and boards is Sean O'Sullivan connected to?

How am I connected?

Name your firm, a company or a person, and DFX finds the published routes to Sean O'Sullivan: a shared portfolio company or board, a prior employer, a co-investor, a shared LP or service provider. Every step is a filed or published record with its source; none is a guess about who knows whom.

See how you connect to Sean O'Sullivan

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Drawing the relationship network…

Roles

1 current, 0 past

Sosv Investments LLC (f/k/a Sosventures LLC) Sole Member
Jan 1, 2009 to present · “Schedule A: O'SULLIVAN, SEAN, SOLE MEMBER, since 01/2009, ownership E, control person Y”
Fact Form ADV

Investments attributed to this person

No investment attributed yet. Attribution needs a source naming this person on the deal: a quote, a board seat, a portfolio page credit.

Board seats and vehicles

0 boards, 8 vehicles

Sosv III LP Director/Promoter Dec 15, 2015
Decarbonization Consortium LP Promoter Nov 4, 2021
Sosv V LP Promoter Aug 11, 2022

Timeline

1 dated entry: events, attributed deals, board seats and role changes

Jan 1, 2009
Joined Sosv Investments LLC (f/k/a Sosventures LLC) as Sole Member
Role began Fact Sosv Investments LLC (f/k/a Sosventures LLC) Form ADV