Limbach Holdings, Inc. engages in the provision of commercial specialty contractor services in the areas of heating, ventilation, air-conditioning, plumbing, electrical and building controls for the design and construction of new and renovated buildings, maintenance services, energy retrofits, and equipment upgrades. The company is headquartered in Warrendale, Pennsylvania and currently employs 400 full-time employees. The company went IPO on 2014-07-16. The firm partners with the owners and facilities managers who have mission-critical mechanical, electrical, and plumbing infrastructure. The firm operates in two segments: General Contractor Relationships (GCR), and Owner Direct Relationships (ODR). The GCR segment manages new construction or renovation projects that involve primarily mechanical, plumbing, or electrical services awarded to the Company by general contractors or construction managers. Through the ODR segment, the Company performs owner direct construction projects and/or provides maintenance or services primarily on mechanical, plumbing or electrical systems, building controls and specialty contracting projects direct to, or assigned by, building owners or property managers. The firm works with six vertical markets: healthcare, industrial and manufacturing, data centers, life science, higher education and cultural and entertainment.