Your Strategic Finance Partner

Trackline Partners brings nearly a decade of private equity experience—both as operators and sponsors—to help portfolio companies unlock their full potential.

Founder and Managing Partner Zachary Castle has spent his career helping private equity–backed and privately held businesses navigate the challenges of growth and change, while aligning the goals of partners, creditors, shareholders, boards of directors, and—most importantly—the employees who make it all work.

As a former CFO of a PE backed high-growth telecom and software company, he experienced firsthand what it takes to scale rapidly, implement systems under pressure, and make tough calls when plans shift. Today, Zachary and the TrackLine team bring that experience to management teams and owners alike—providing steady guidance, financial discipline, and practical insight to help companies move confidently through critical inflection points.

Meet the Team

  • Zachary Castle, CPA

    Founder & Managing Partner

    Zachary Castle is an accomplished finance executive and advisor with nearly 15 years of experience in accounting, finance, and private equity. As the former CFO of a leading PE-backed business, he guided the company through significant expansion, delivering both top-line growth and operational efficiency. With over nine years of hands-on operating experience in the private equity space and additional expertise on the investment management side, Zachary brings a 360-degree perspective to the challenges and opportunities facing portfolio companies.

    He has successfully led ERP implementations, streamlined financial operations, and provided strategic fractional CFO support that consistently enhances enterprise value. Zachary holds an MBA from Columbia Business School and a BBA in Finance from Ohio University, and is a Certified Public Accountant. His blend of operational leadership, strategic insight, and deep financial expertise makes him a trusted partner for private equity sponsors seeking to accelerate growth and maximize returns.

  • Manuel Quiles

    Associate

    Manuel Quiles brings experience in sell-side M&A advisory and project accounting in the pharmaceutical space. In his M&A work, he has supported lower middle market transactions through comprehensive business valuations, rigorous financial analyses, and the preparation of high-quality client materials. His project accounting background includes detailed cost analysis, precise budgeting, and close collaboration with project management teams to ensure accurate financial oversight and successful project delivery.

    Manuel holds a Bachelor of Arts in Business from Franklin & Marshall College, providing a strong foundation in financial principles and analytical methodologies that inform his work. His combination of transaction experience, analytical skill, and operational support makes him a valuable partner to organizations seeking to execute strategic initiatives with accuracy and efficiency.

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