« All Articles

Calvert Street Capital Partners and Kathi Holst Invest in D2K Traffic Safety, Inc

September 21, 2022

Naperville, Illinois, September 21, 2022: Calvert Street Capital Partners (“Calvert Street”) and Kathi Holst are pleased to announce an investment in D2K Traffic Safety, Inc. (“D2K”, or “the Company”), a leading provider of traffic safety services to the greater Chicagoland area and surrounding states. This investment, made in partnership with the founders of D2K, establishes a platform for organic growth as well as future acquisitions.

Calvert Street invests in this opportunity alongside Kathi Holst, a 40+ year industry veteran who has served as an adviser to the Company since its inception. Kathi will act as the Operating Partner, assisting the Company with strategic planning, management development and acquisitions. Kathi commented, “I’m pleased to partner with Calvert Street based on their track record of supporting and growing field-based service companies”.

Devvon Holst-Clay and Meagan Long founded D2K in 2013, and Mark Long joined one year later. Together, these three executives successfully built the Company into a prominent competitor focused on traffic control, pavement marking and flagging. The Company prides itself on its people-oriented culture, safety record and outstanding service to its customers.

Mark Long, President, commented on the deal by saying, “The Company is at an inflection point where partnering with Calvert Street to support the Company’s growth plan makes a lot of sense.”

“We see a compelling opportunity to build upon D2K’s strong track record of growth while maintaining the Company’s culture and outstanding reputation for quality service,” said Calvert Street Partner, Mike Booth.


D2K Traffic Safety is an industrial service business specializing in traffic safety services including traffic control, pavement marking, signing and flagging. D2K’s primary customers include Heavy-Highway contractors, municipalities, utility firms and contractors, airports and developers in the Chicagoland area. Since it’s inception in 2013, D2K has used a solutions-based approach to deliver high quality services to its customers with a focus first on safety.


Calvert Street is a lower middle market investment firm based in Baltimore, Maryland. Our firm consists of experienced professionals pursuing two distinct investment strategies: (i) control equity investments (through Calvert Street) and (ii) mezzanine investments (through Parkway Capital). Our control equity team utilizes a research driven approach to identify attractive businesses providing critical services to the industrial and commercial sectors. Since our inception in 1995, Calvert Street has partnered with talented managers to drive profitable growth and organizational transformation. Calvert Street’s investment professionals have invested in over 130 lower middle market companies representing invested capital of $1 billion. More information can be found on our website (