Jonathan Grinnon

About Jonathan Grinnon

I’m a Fractional CFO and finance/operations executive with 25+ years of experience helping small and mid-sized businesses scale with confidence. I specialize in turning complexity into clarity—building financial models that guide multimillion-dollar decisions, streamlining operations for efficiency and profitability, and aligning strategy with execution across every corner of the business.Whether leading funding rounds, optimizing back-office systems, or mentoring leadership teams, I bring a hands-on, 360° approach that balances precision with pragmatism. My clients value my ability to plug in quickly, ask the right questions, and deliver solutions that drive sustainable growth—not just short-term wins.I’m a CFA charterholder with a BBA in Finance from Villanova University, a former collegiate athlete, and a lifelong team builder—on the course, on the court, and in the office. I thrive in environments where trust, transparency, and performance matter.If you\'re a founder, operator, or investor looking for a strategic financial partner who can elevate your business from the inside out, let’s connect. I’m always open to conversations about fractional engagements, advisory roles, or collaborative problem-solving.

Experience

1. Fractional CFO

   Arena

   Sep 2025 — Present · Reston, VA, US

   Selected to join Arena CFO’s national network of fractional finance executives, delivering fractional CFO services to law firms, early-stage ventures, professional services, and franchise businesses.I specialize in crafting scalable financial solutions that improve operational efficiency and drive measurable results. My work spans:• Budgeting, forecasting, and financial planning • M&A strategy and expansion support • Fundraising and capital needs assessment • Exit planning and investor readiness • Financial modeling and performance analysis • AP/AR oversight and aging management Proud to serve Arena CFO clients with hands-on leadership, strategic insight, and a commitment to long-term success.

Education

• Villanova School of Business

  Bachelor of Business Administration - BBA, Finance, General

  1994 — 1998

• Chaminade High School

  High School Diploma

  1990 — 1994

Skills

• Mergers & Acquisitions
• Business Analysis
• Due Diligence
• Forecasting
• Managerial Finance
• Banking
• Financial Reporting
• Bookkeeping
• Creative Problem Solving
• Investments
• Asset Managment
• Financial Modeling
• Executive Management
• Accounting
• Problem Solving
• Business Planning
• Asset Management
• Small Business
• Executive Reporting
• Private Equity
• Cash Flow
• Corporate Finance
• Financial Analysis
• Portfolio Management
• Small Business Accounting
• Financial Management
• Analysis