Michael Rosselli
Fractional General Counsel and Regulatory Advisory for Startups, Fintechs and Growth Stage Companies
About
I'm the founder of Marathon Counsel, a solo fractional general counsel and regulatory advisory practice for startups, fintechs, and growth-stage companies. I work with founders and companies from pre-seed through Series B and with regulated entities, including broker-dealers, prediction markets platforms, exchanges, payment processors, clearinghouses, RIAs, and digital asset platforms.
My work runs on two tracks: embedded fractional GC and financial regulatory advisory. I price on fixed fees and subscriptions rather than the hourly clock, and I'm at my best in novel or unsettled areas, mapping a defensible path forward rather than applying a template.
Practice areas
- Administrative Law > CFTC
- Administrative Law > FINRA
- Administrative Law > SEC
- Banking
- General Corporate
- Commercial Contracts
- Crypto & Blockchain
Featured clients
Services
Fractional General Counsel
Ongoing outsourced in-house counsel for fintech and growth-stage technology companies. A fixed monthly subscription covering day-to-day corporate, commercial, employment, and governance matters including contract review, vendor and customer agreements, board and equity questions, and the recurring legal needs of a scaling company, handled as an embedded function rather than one-off projects.
Commercial Contract Drafting & Negotiation
Drafting, review, and negotiation of commercial agreements including MSAs, SaaS and subscription terms, NDAs, vendor and customer contracts, data-sharing and reseller agreements. You receive negotiated, signature-ready documents with a clear summary of risk and negotiation positions.
Startup Formation & Corporate Governance
Entity formation and governance setup for founders from pre-seed through Series B -- entity selection and formation, founder and operating agreements, board and corporate governance structure, and a clean corporate record ready for diligence and fundraising.
Experience
Compliance Officer and US Counsel
Da Vinci Trading
Jun 2025 – Mar 2026
Senior Attorney
R.J. O'Brien
Sep 2022 – May 2025
Compliance Associate
PEAK6
Apr 2021 – Sep 2022
J.D.
University of Florida Levin College of Law
2019
BA - Philosophy
University of Florida
2016