Justin Mateen
About Justin Mateen
Justin Mateen, 39, is an independent director of American Bitcoin Corp (formerly Gryphon Digital Mining, Inc.), appointed at the merger closing in early September 2025; he was designated a Class III director and serves on the Audit Committee . He co-founded Tinder and served as its Chief Marketing Officer from August 2012 to July 2014, remaining as an advisor until August 2017, and holds a BBA from USC Marshall School of Business . He founded JAM Fund in August 2020 and has been recognized for early-stage investing (Business Insider/Tribe Capital Seed 100; Forbes Founders under 30) .
Past Roles
| Organization | Role | Tenure | Committees/Impact |
|---|---|---|---|
| American Bitcoin Corp (Historical ABTC) | Director (Historical ABTC Board) | March 2025–Sep 2, 2025 | Pre-merger board member; transitioned to combined company’s board at closing |
| Tinder | Co-founder; Chief Marketing Officer | Aug 2012–Jul 2014 (advisor until Aug 2017) | Built and scaled brand and growth engine |
External Roles
| Organization | Role | Tenure | Committees/Impact |
|---|---|---|---|
| JAM Fund | Founder; Early-stage investor | Aug 2020–present | Investor in Brex, Curative Health, Deel, Kalshi, Speak, Varda, Whop, among others |
Board Governance
- Appointed to the combined company board at merger closing; board size fixed at five (Richard Busch, Justin Mateen, Michael Broukhim, Asher Genoot, Michael Ho), with Mateen designated Class III .
- Audit Committee membership: Broukhim (Chair), Mateen, Busch; each member determined independent under Sarbanes-Oxley, SEC Rule 10A‑3, and Nasdaq rules; Broukhim deemed an “audit committee financial expert” .
- Prior GRYP governance: the April 2025 special meeting proxy proposed declassification of the board and annual elections beginning with the 2025 meeting, reflecting responsiveness to investor governance preferences .
| Committee | Members | Chair | Independence Determination |
|---|---|---|---|
| Audit Committee | Michael Broukhim; Justin Mateen; Richard Busch | Michael Broukhim | All members independent under Sarbanes-Oxley, Rule 10A‑3, and Nasdaq; Broukhim is an audit committee financial expert |
Other Directorships & Interlocks
| Company | Role | Public Company? | Notes |
|---|---|---|---|
| American Bitcoin Corp (Historical ABTC) | Director | No (pre-merger) | Served March 2025–closing; appointed to combined public company board at closing |
Expertise & Qualifications
- Technology and growth expertise: co-founder/CMO of Tinder; scaling consumer technology businesses .
- Early-stage investing: founder of JAM Fund with notable portfolio companies (Brex, Curative Health, Deel, Kalshi, Speak, Varda, Whop) .
- Recognitions: Ranked top early-stage investor (Business Insider and Tribe Capital Seed 100 in 2021–2022); Forbes Founders under 30 list in 2020 .
- Education: Bachelor of Business Administration, USC Marshall School of Business .
Employment & Contracts (Director)
- Indemnification: The company adopted a standard form of indemnification agreement for directors and officers, applicable to board members including Mateen .
Governance Assessment
- Committee effectiveness and independence: Mateen’s placement on an all-independent Audit Committee—chaired by an identified financial expert—supports board oversight quality and investor confidence in financial reporting and controls .
- Strategic fit: His technology growth and venture investing background adds capital markets and scaling expertise to a Bitcoin accumulation/mining strategy, complementing other board members’ operating experience .
- Disclosure gaps: Director-specific compensation, equity ownership, attendance, and stock ownership guidelines were not disclosed in available GRYP/ABTC filings to date; monitor forthcoming proxy materials for pay mix, ownership alignment, and any related‑party transactions .