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Platform·Aerospace & Defense/Defense Services·July 21, 2026

Bluestone backs Delphinus Engineering

The U.S. Navy maintenance and modernization contractor plans to invest in technical capabilities and pursue acquisitions across the maritime defense market.

Takeaways

  • Delphinus provides maintenance, modernization and industrial services to the U.S. Navy.
  • The company plans to pursue acquisitions across the naval sustainment market.
  • Longtime executive Roby Lentz succeeded founder Ranjit Das as chief executive.
BuyerBluestone Investment Partners
TargetDelphinus Engineering
TypePlatform
GeographyUnited States
IndustryAerospace & Defense
Sub-sectorDefense Services

Bluestone Investment Partners invested in Delphinus Engineering, a provider of maintenance, modernization and industrial services to the U.S. Navy and maritime defense community.

Delphinus has supported naval fleet maintenance and ship modernization for more than three decades.

The company plans to invest in its workforce and technical capabilities while pursuing acquisitions across the naval maintenance, modernization and sustainment market.

Founder Ranjit Das is retiring, and longtime executive Roby Lentz has become chief executive.

Bluestone invests in lower middle-market defense and government-services businesses.

Financial terms were not disclosed.