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Legrand North America is the North and Central American division of Legrand, a global specialist in electrical and digital building infrastructure; the division is described as the largest component of the worldwide group, with more than 9,200 employees. It designs and manufactures products and connected infrastructure for residential and non-residential spaces, and its portfolio has expanded from electrical switches, wires, cables, controls, and shades to include audio/video, data-center infrastructure, and lighting. Legrand says it was founded more than a century ago.
LegWorks is a for-profit social enterprise that designs and supplies prosthetic knee joints, including its waterproof All-Terrain Knee collection, for amputees who need dependable mobility without the price of high-end devices. Its patented AutoLock Technology pairs stability across uneven ground with variable-cadence walking, while partnerships in developing countries have helped fit more than 500 amputees across 19 countries. The company’s stated aim is to make high-functioning prosthetic technology accessible regardless of where people live or what they can pay.
Founded in 2021 by York College of Pennsylvania mechanical engineering alumni, Lehr Labs is a York, Pennsylvania 3D-printing shop shaped by manufacturing experience and an engineering approach to custom work. The company helps customers turn demanding designs into accurate printed parts, advising on material choices and improving printability along the way.
With a coast-to-coast network of upfitting centers and more than 300 trained technicians, LEHR equips mission-critical vehicles for police, fire, utility and other essential fleets. Its work ranges from custom vehicle integration to specialized ballistic-glass installations, supported by Lehr University, a paid 12-week training program that develops technicians through classroom and hands-on instruction. The company also distributes fleet equipment nationwide and provides remote and on-site support after installation.
In Manlius, Leigh-Dale Specialties is a small custom plastic fabrication shop owned and operated by Martin Ciesielski, who brings more than 42 years of experience to each job. The shop works with customers on one-off pieces or production runs, turning ideas into practical items such as custom displays and machine guards.
LEKI USA makes poles and gloves for people who move through mountains, trails and snow, with a particular focus on lightweight equipment that can keep pace with both elite athletes and everyday adventurers. Its story of innovation reaches back to 1974, when Klaus Lenhart and Reinhold Messner developed the adjustable Makalu trekking pole, and the company still tests products in demanding conditions while supporting more than 1,000 athletes. LEKI also designs for a longer life, offering replacement parts and repairs for worn equipment rather than treating every old pole as disposable.
Lektra turns solar-powered homes, businesses, and microgrids into distributed AI compute sites, pairing on-site energy with servers that run cloud workloads. Its Energy Host program lets power owners buy and host Lektra BusinessEdge hardware while the company’s cloud platform connects, monitors, meters, and bills the resulting infrastructure. The New York-based company’s model gives renewable-energy producers a second customer beyond the grid and extends computing closer to the people and businesses using it.
Founded in 1990, Lencore engineers sound-masking, paging, music and audio systems that make conversations less intelligible at a distance while keeping nearby communication clear. Its customizable systems are built for settings where privacy and focus matter, including open-plan workplaces, healthcare facilities and government spaces, and its Green Sound® technology is tuned to human speech frequencies. Lencore also manufactures custom-engineered speakers and offers U.S.-manufactured solutions compliant with the Buy American Act and Trade Agreements Act.
Lendal North America is an adventure-minded paddle company shaped by engineers, scientists, and athletes who draw on their own time in demanding waters. It designs and builds kayak paddles for everyone from newcomers to seasoned expedition paddlers, with a focus on continually refining the tools used to get on the water.
From its Upper Austrian headquarters, Lenzing Aktiengesellschaft turns renewable wood into cellulose-based fibers for textiles, nonwovens and technical applications. The Lenzing site is the only production facility worldwide making all three generations of cellulose fibers—lyocell, modal and viscose—and also serves as the Lenzing Group’s central research and development center. Its biorefinery concept uses every component of the wood, producing pulp, fibers, co-products and bioenergy rather than leaving valuable material to waste.
Since 1939, family-owned Leo Ingwer has designed and manufactured fully custom diamond jewelry in New York City’s Diamond District. Now in its third generation, the company keeps every process in-house and unautomated, crafting one-of-a-kind engagement rings, wedding bands, and fine jewelry at its Manhattan headquarters.
Established in 1986, Leo International, Inc. is a Brooklyn-based import manufacturer serving the PVF, HVAC, and plumbing industries. The company is known for producing piping products through forging, casting, and injection molding, including service-weight hub fittings.
Founded by Leo in 1948, Leo J. Roth Corporation provides commercial and residential HVAC, plumbing, and roofing services across the greater Rochester area, along with green-energy solutions. Now in its fourth generation, the Webster-based company is a New York State-certified Women-owned Business Enterprise and also handles custom commercial pipe fabrication through its metal shop.
Founded in 1982 as a traditional printing company, Leo Paper Group has grown into a global printing communications manufacturer producing paper bags, books, packaging and other printed products. With more than 10,000 employees across eight worldwide locations, the group combines large-scale production with its own product-development and innovation teams, including a technology center focused on new materials and printing techniques. Its manufacturing story also includes a stated goal of becoming a zero-waste factory and long-running efforts to reduce material, water and energy use.
Born from New York City’s wartime building boom, Leonard Powers has served the city’s steam systems since 1933. The Manhattan company is known for its deep Con Edison district-steam experience and for maintaining a 24/7 emergency response for building owners across the region. Its newer LPI Energy group extends that long local history into turnkey energy-conservation work for commercial, multifamily, and institutional clients.
Since 1945, family-owned and operated Leonardi Manufacturing has made U.S.-made metal solutions, evolving from handbag frames into custom contract manufacturing and its own tree-care products. Based in Weedsport, New York, the company works with customers from design and prototyping through production, drawing on more than 80 years of metalworking experience and a long history of developing stump-grinding and other tree-care solutions.
As a Leonardo subsidiary with operations in Tucson and Huntsville, Leonardo Electronics US is known for translating advanced electronics expertise into solutions for demanding defense and commercial programs. Its Tucson facility manufactures high-power semiconductor laser components and systems, while the Huntsville operation provides lifecycle support for U.S. government and Department of Defense programs. The Tucson site holds AS 9100D, ISO 9001:2015, and ISO 14001:2015 certifications.
Leprino Foods Company is a family-owned dairy foods and ingredients manufacturer founded in Denver in 1950, when Mike Leprino Sr. began making mozzarella for the family grocery store. It is the world’s largest mozzarella cheese producer and operates manufacturing facilities on three continents. Its products reach more than 70 countries.
Established in 1970, LeRoy Plastics is a second-generation family-owned manufacturer in Le Roy, New York, making custom extruded, formed and molded plastic tubing products for customers in the United States and abroad. Its on-site tooling and machining facility supports prototype development and custom solutions, while its ISO 9001-certified quality system covers production from the local shop floor to international supply. The company’s roots are in forming extruded tubing, a specialty it has carried forward for more than five decades.
Founded by aerospace and business leaders including former NASA and commercial-launch veterans, LESATH International is developing a highly reusable orbital launch platform for rapid delivery of cargo to varied trajectories. Its SCORPIUS I vehicle is designed around a MethaLOX-cooled engine and modular payload capability, with the company aiming to broaden access to orbit for civilian, government, and first-time space customers.