Boca Raton, FL and New York, NY – On August 26,  2026, Branford Castle Partner’s Fund I completed the sale of Vitrek LLC to Industrial Physics, the global packaging, material, and coating test and measurement group backed by KKR-affiliated investment funds.  Vitrek, based in Lockport, IL, is a leader in electronic test and measurement including for electrical safety testing and electronic jet engine balancing systems for military and commercial applications.  Vitrek was the third investment in Branford’s Fund I and now represents its fifth exit.  During Branford’s ownership, Vitrek expanded its product lines, integrated three add-on acquisitions, and professionalized its sales and marketing efforts.

“We’ve enjoyed our partnership with the entire Vitrek team, led by Don Millstein and Todd Stukenberg. They have built one of the premier companies in electrical safety and precision test and measurement, broadening into new end markets along the way. We wish Vitrek continued success with its new owner,” said David Castle, Managing Partner of Branford Castle Partners.

“It has been a privilege to work alongside Don, Todd and the entire Vitrek team. Vitrek is a stronger, more diversified business today, and we’re excited to see that continue under Industrial Physics,” added Marilyn Yang, Managing Director of Branford Castle Partners.

The transaction was supported by the investment banking team at Stifel, led by Bharat Ramprasad and Michael Hart, the legal team at Akerman LLP, headed by Jed Freeland, and the accounting/finance team at RSM, headed by Michael Giuliano.  At the time of the sale, Vitrek’s lenders/financing partners were Pelham S2K and Farragut Capital Partners.

Vitrek’s CEO, Don Millstein, added, “We had a great run with the team at Branford. We leave this partnership a larger, more capable organization.”

Todd Stukenberg, President of Vitrek, added, “We’re proud of what we built together with Branford and are now excited for Vitrek’s next chapter with Industrial Physics.”

About Branford Castle Partners

Branford Castle is a private market investor focused on lower middle-market investments across North America. With more than 35 years of helping to grow businesses, the firm typically makes control investments in companies with up to $15 million of EBITDA and a leadership position in a niche industry. Branford Castle prides itself on the strong relationships it develops with its portfolio company managers. Branford Castle has particular expertise in industrials/specialty manufacturing, consumer products, specialty materials, test and measurement, business services and logistics. Please visit Branford Castle’s website at www.branfordcastle.com for additional information.

About Vitrek

Vitrek designs and manufactures precision test and measurement solutions that help the aerospace, defense, semiconductor, medical device and other diversified industrial manufacturers improve product quality, ensure regulatory compliance, and accelerate production. From electrical safety testing and high-voltage measurement to signal conditioning, high-speed data acquisition, and semiconductor metrology, Vitrek’s family of brands—including MTI Instruments and GaGe—supports engineers throughout the product development, qualification, production, and maintenance lifecycle.

About Industrial Physics

Industrial Physics is a global packaging, material, and coating test and measurement group. With 12 specialist brands operating across 19 industries in 75 countries, Industrial Physics protects the integrity of its customers’ brands and products through best-in-class technology, test and measurement systems, and services. www.industrialphysics.com

Contact:

For Branford Castle:

Lambert by LLYC
Christina Maldonado
christina.maldonado@llyc.global

For Industrial Physics:

Karen Mann | Global Marketing Director | kmann@industrialphysics.com