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OSIsoft, LLC
Company typePrivate
IndustryApplication software
FounderJ. Patrick Kennedy
DefunctMarch 19, 2021; 3 years ago (2021-03-19)[1]
HeadquartersSan Leandro, California, USA
Key people
J. Patrick Kennedy (CEO)
Michael Siemer (President)
ProductsPI System  · PI ProcessBook  · PI Server  · PI DataLink  · PI Vision
Number of employees
>1300 (2016)

OSIsoft, LLC is a manufacturer of application software for real-time data management, called the PI System. Founded in 1980, OSIsoft was privately held and headquartered in San Leandro, California. In August 2020, it was announced that the UK-based production company AVEVA agreed to buy OSIsoft in a deal worth $5 billion;[2] the purchase was subsequently completed on 19 March 2021 for a final consideration of £3,831.4 million.[3][4]



On January 5, 2011, OSIsoft announced a $135 million minority investment by Technology Crossover Ventures and Kleiner Perkins Caufield & Byers.[5]

Lit San Leandro, a business associated with OSIsoft, has built a fiber-optic network in the city of San Leandro, linking high tech and other businesses. They have also proposed providing a high-speed fiber-optic network for the industrial corridor in nearby Hayward.[6]


  1. ^ "Completion of Acquisition of OSIsoft, LLC". tools.eurolandir.com. Retrieved 2021-09-24.
  2. ^ Provan, Sarah; Fildes, Nic (August 25, 2020). "Aveva to buy US tech group OSIsoft in $5bn deal". Financial Times. Retrieved August 25, 2020.
  3. ^ "Completion of Acquisition of OSIsoft, LLC". tools.eurolandir.com. Retrieved 2021-09-24.
  4. ^ "Annual Report 2021" (PDF). AVEVA. Retrieved 24 September 2021.
  5. ^ "News" (Press release).
  6. ^ KQED Jan 18 2012 OSIsoft and Lit San Leandro Bringing Fiber-Optic to Tech Firms