DFX Intelligence

Justin Mateen

Managing Memberat JAM Fund, LLC

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

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

Ask DFX about this View relationships Find contacts Investments Board seats

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

1 additional role or seat

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

Includes 3 days of DFX Intelligence. Then $199/month unless canceled.

What matters now

2020
since
Managing Member at JAM Fund, LLC since 1 Sep 2020.
Tenure says how settled this partner is at the firm.
FactForm ADV Schedule A and the firm's team pageFor Founders, LPsRoles →

Relationship network

6 connected entities1 observed investment recordinvestment records 2025

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
Company
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 Justin Mateen connected to?

How am I connected?

Name your firm, a company or a person, and DFX finds the published routes to Justin Mateen: 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 Justin Mateen

Includes 3 days of DFX Intelligence. Then $199/month unless canceled.

Drawing the relationship network…

Roles

1 current, 0 past

JAM Fund, LLC Managing Member
Sep 1, 2020 to present · “Schedule A: Mateen, Justin, MANAGING MEMBER, since 09/2020, ownership E, control person Y”
Fact Form ADV

Investments attributed to this person

Company	Round	Investor	Attribution	Date	Source
American Bitcoin Corp.	board only	JAM Fund, LLC	strongly supported · board	Jul 9, 2025	Inference sec.gov

Board seats and vehicles

1 board, 4 vehicles

American Bitcoin Corp. Director Jul 9, 2025 Inference
JAM Abl Space Target Fund, L.P. Executive Officer Oct 21, 2021
JAM Target Fund 5, L.P. Director Sep 11, 2024
JAM ABL Space Target Fund 2, L.P. Director Dec 9, 2024

Timeline

2 dated entries: events, attributed deals, board seats and role changes

Jul 9, 2025
Board seat at American Bitcoin Corp. (JAM Fund, LLC)
Board seat Inference American Bitcoin Corp. Form D
Sep 1, 2020
Joined JAM Fund, LLC as Managing Member
Role began Fact JAM Fund, LLC Form ADV