Altair Engineering Inc., together with its subsidiaries, develops and offers software and cloud solutions in the areas of simulation, high-performance computing, data analytics, and artificial intelligence in the United States and internationally. It operates through two segments, Software and Client Engineering Services. The Software segment offers solvers and optimization technology products, high-performance computing software applications and hardware products, modeling and visualization tools, data analytics and analysis products, and Internet of Things platform and analytics tools, as well as support and the complementary software products. This segment also provides software technologies in the areas of computational fluid dynamics and fatigue, manufacturing process simulation, and cost estimation for the applications in automotive, marine, motorcycle, aerospace, chemical, and architecture industries; and software-related services, such as consulting, implementation, and training services that focuses on the product design and development expertise and analysis from the component level up to complete product engineering at various stage of the lifecycle. The Client Engineering Services segment provides client engineering services. In addition, the company develops and sells solid state lighting technology along with communication and control protocols based on its intellectual property for the direct replacement of fluorescent tubes with LED lighting. Its integrated suite of software optimizes design performance across various disciplines, including structures, motion, fluids, thermal management, electromagnetics, system modeling, and embedded systems. The company serves universities, government agencies, manufacturers, pharmaceutical firms, banking, financial services, and insurance, weather prediction agencies, and electronics design companies. Altair Engineering Inc. was founded in 1985 and is based in Troy, Michigan. As of March 26, 2025, Altair Engineering Inc. operates as a subsidiary of Siemens Product Lifecycle Management Software Inc.