Mill Rock Capital Makes Strategic Growth Investment in DRT Holdings, Inc.

GroundForce Capital Strategic Investment in Rock River Laboratory

July 17, 2026

IT Services

GroundForce Capital announced a strategic investment in Rock River Laboratory, the largest independent agricultural testing platform in North America. The investment adds an operationally experienced partner to support organic growth and future M&A in the fragmented agricultural and environmental testing market alongside existing investor Aqua Capital.

Artemis Capital Partners Acquires Millrock Technology

September 30, 2025

Medical Devices

Artemis Capital Partners, a Boston-based private equity firm, has acquired Millrock Technology Inc., a Kingston, New York manufacturer of lyophilization (freeze-drying) instrumentation and process development tools for the pharmaceutical, biotech, and diagnostics markets. Under Artemis’ ownership Millrock will continue to operate independently from its Kingston facility while Artemis invests to scale the company’s technical capabilities and global reach.

DRT Holdings Acquires Custom Machining Corporation

September 11, 2023

Manufacturing

DRT Holdings, LLC (DRT), a portfolio company of Mill Rock Capital, has acquired Custom Machining Corporation (CMC), a Denver-based maker of high-speed, high-precision liner systems and parts for the metal packaging industry. The founders, Terri and Allan Ross, will step back following the transaction; CMC will join DRT's Metal Packaging Systems (DRT MPS) segment to broaden product capabilities, aftermarket parts and geographic reach. Terms were not disclosed.

Mill Rock Packaging (Mill Rock Capital) Acquires Impressions Incorporated

July 18, 2022

Packaging

Mill Rock Packaging Partners LLC, a portfolio company of Mill Rock Capital, has acquired Impressions Incorporated, a specialty paperboard packaging and commercial printing business based in St. Paul, Minnesota. The acquisition expands Mill Rock Packaging's national footprint into the Midwest and adds Impressions' folding-carton, lithographic printing and value-added engineering capabilities to the combined platform; financial terms were not disclosed.

Mill Rock Packaging Partners Acquires All Packaging Company

February 22, 2021

Packaging

Mill Rock Packaging Partners, the specialty packaging platform backed by Mill Rock Capital, has acquired All Packaging Company, a paperboard folding carton manufacturer based in Aurora, Colorado. The acquisition (terms undisclosed) expands Mill Rock Packaging's Western U.S. footprint and capabilities across design, printing and converting while All Packaging's president Kenneth Pepper and senior management retain ownership stakes and will continue to lead the business.

Strattam Capital Invests in Rock Solid Technologies

November 29, 2018

Software

Strattam Capital made a majority growth investment in Rock Solid Technologies, a Puerto Rico-based software and IT services firm specializing in Microsoft Dynamics 365 solutions. The partnership is intended to accelerate Rock Solid's expansion into North American markets (U.S. and Canada) and support job creation and product growth.