Hillside, N.J.-headquartered Donjon Marine Co. LLC has been acquired by Miami-based Tallvine Partners, an independent investment advisor focused on value-add middle-market infrastructure opportunities. Tallvine notes that Donjon Marine is a leader in critical marine infrastructure with a comprehensive suite of essential solutions for the operation and maintenance of North America’s waterways, coastal regions, and harbor infrastructure. “The launch of our marine infrastructure platform and acquisition of Donjon Marine underscore our commitment to investing in resilient, essential infrastructure that supports global commerce, advances environmental stewardship, and delivers stable, recurring cash flows,” said Thomas Lefebvre, partner & CEO of Tallvine Partners. “With its long-standing reputation for safety, excellence, and service, Donjon Marine is an ideal cornerstone for this platform. “We view this acquisition and partnership as a highly compelling opportunity to build a leading marine infrastructure platform across North America,” said Victor Sosa, artner at Tallvine Partners.