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Deal Roundup: HIG Capital agrees Celerion sale to THL Partners, GTCR closes Fiduciary acquisition

Reported by Altassets
Apr 23, 2026· 2 min read
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Key Takeaways
  • • HIG Capital has agreed to sell Celerion, a clinical pharmacology and bioanalytical sciences specialist, to THL Partners, approximately 3.5 years after acquiring the business at the end of 2022; the sale underscores continued portfolio optimization activity among mid-market PE firms.
  • • GTCR has closed its acquisition of Fiduciary, a Boston-based private wealth manager founded in 1885, which manages approximately $34 billion in total assets for ultra-high-net-worth individuals, families, and institutions across New England.
  • • Fiduciary acquisition positions GTCR to expand service breadth, enhance investment platform capabilities, and scale the business through technology enablement and headcount growth targeting the affluent wealth management segment.
  • • Stonepeak acquired Southern Marinas from KSL Capital Partners, with the portfolio expanding to 16 marinas and 6,700+ berths during KSL's five-year ownership period, reflecting infrastructure investor appetite for tangible asset platforms.
Summary
HIG Capital's agreement to sell Celerion to THL Partners represents a mid-cycle exit from a clinical research platform acquired at the end of 2022. Celerion specializes in first-in-human dose escalation studies, cardiac safety assessments, and drug-drug interaction research—core capabilities supporting pharmaceutical regulatory approval pathways. During HIG's ownership, the business achieved industry-leading growth metrics, according to Mike Gallagher, managing director at HIG Capital. The transaction reflects disciplined capital deployment within the mid-market PE space, with HIG returning capital to fund new investment opportunities while THL Partners assumes ownership of an established platform with demonstrated operational momentum.

GTCR's completed acquisition of Fiduciary expands its footprint in the high-net-worth wealth management sector. Fiduciary, operating since 1885 as a family office before evolving into a full-service wealth manager, manages $34 billion in assets and serves ultra-high-net-worth clients across New England. GTCR has outlined strategic priorities including broadening service offerings, upgrading technology infrastructure, and expanding the employee base to capture growth opportunities within an affluent client base. The transaction underscores continued private equity interest in wealth management platforms serving concentrated geographies and client segments with substantial assets under management.

Stonepeak's acquisition of Southern Marinas from KSL Capital Partners reflects infrastructure investor appetite for operational real asset platforms. Under KSL's five-year stewardship, Southern Marinas expanded to 16 facilities with over 6,700 berths, demonstrating asset optimization and revenue growth potential. Stonepeak's acquisition signals confidence in the marina operator's cash flow characteristics and ancillary service revenue streams, typical of real asset infrastructure plays targeting long-duration, inflation-resilient earnings.

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Altassets Deal Roundup: HIG Capital agrees Celerion sale to THL Partners, GTCR closes Fiduciary acquisition