Grafine Partners Announces Strategic Partnership with Amberjack Capital Partners

NEW YORK and HOUSTON, Oct. 15, 2025 /PRNewswire/ -- Grafine Partners ("Grafine"), a specialized investment firm that seeds and co-invests alongside emerging private equity managers with deep sector expertise and proven track records, today announced a strategic partnership with Amberjack Capital Partners ("Amberjack"). Amberjack, headquartered in Houston and run by Managing Partner Jason Turowsky, is a private equity firm that makes control investments in lower middle market businesses within the Infrastructure & Industrial Services and Waste & Environmental Services sectors. Financial terms of the partnership were not disclosed.

Elizabeth Weymouth, Founder and Managing Partner at Grafine, commented, "Jason and the Amberjack team have built a distinctive private investment platform. They exemplify the experienced and entrepreneurial investors we seek to partner with – those pursuing differentiated strategies that seek to generate strong, risk-adjusted returns. We are thrilled to support Amberjack in their next phase of growth."

"This strategic partnership with Grafine will enhance our ability to continue growing as a firm and investing in the lower middle market critical infrastructure services sector," said Mr. Turowsky. "This sector includes a diverse range of businesses with compelling opportunities for growth, driven by secular tailwinds such as the need to modernize aging assets, reshore U.S. production, and meet increasing power demand."

Mr. Turowsky added, "Grafine is a true strategic partner to us -- their experience, insight, and global network will add value beyond capital, accelerating Amberjack's growth."

Amberjack partners with entrepreneurs, managers, and business owners – typically as the first institutional capital provider – bringing company-building expertise to drive growth and long-term value creation. The firm focuses on building institutional-quality companies by providing strategic capital, enhancing operational efficiency, implementing governance best practices, and strengthening leadership teams.

Amberjack represents the final investment in Grafine Capital I, Grafine's inaugural seeding strategy, which closed in early 2024 with approximately $600 million in total capital commitments. In addition to its seeding strategy, Grafine also has a co-investment and direct investment platform.  

Kirkland & Ellis served as legal advisor to Grafine. Davis Polk & Wardwell LLP served as legal advisor to Amberjack.

About Grafine Partners

Grafine Partners, founded by Elizabeth Weymouth, is an alternative investment management firm created to meet the needs of sophisticated institutional investors seeking innovative approaches to invest private capital with a focus on alignment of incentives. Grafine's differentiated focus allows it to source unique investment opportunities and execute on direct deals across a range of industry sectors, geographies, and capital structures that align with the evolving needs of its institutional investor network. Through a pioneering investment approach, Grafine acts as a principal investor to seed and build private investment firms alongside the next generation of talented private market investors and operating partners. For more information, please visit www.grafine.com.

About Amberjack Capital Partners

Amberjack Capital, headquartered in Houston, TX, is a private equity firm that invests in and partners with entrepreneurs and business owners to build market leaders serving the industrial, infrastructure and environmental end markets. Often the first institutional investor in founder-led companies, Amberjack has a particular focus on supporting high performing companies undertaking strategic or transformative initiatives.

Media Contacts

For Grafine Partners
Zach Kouwe/Jansel Murad
Dukas Linden Public Relations
[email protected]

For Amberjack Capital Partners
Alex Jeffrey
Gasthalter & Co.
[email protected]

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SOURCE Grafine Partners