{{Short description|American software company, 1980 to 2021}} {{Infobox company |name = OSIsoft, LLC |logo = OSIsoft logo.jpg |type = Private |image = BART parking lot at San Leandro station, January 2018.JPG |image_caption = OSIsoft building on the San Leandro Tech Campus, adjacent to San Leandro BART |company_slogan = |foundation = {{nowrap|1980}} |founder = J. Patrick Kennedy |defunct = {{End date and age|2021|3|19}}<ref>{{Cite web|title=Completion of Acquisition of OSIsoft, LLC|url=https://tools.eurolandir.com/tools/Pressreleases/GetPressRelease/?ID=3885136&lang=en-GB&companycode=uk-avv&v=|access-date=2021-09-24|website=tools.eurolandir.com|archive-date=2021-07-09|archive-url=https://web.archive.org/web/20210709183019/https://tools.eurolandir.com/tools/Pressreleases/GetPressRelease/?ID=3885136&lang=en-GB&companycode=uk-avv&v=|url-status=dead}}</ref> |fate = Acquired |successor = Aveva |location = San Leandro, California, USA |key_people = J. Patrick Kennedy (CEO)<br />Michael Siemer (President) |num_employees = >1300 <small>(2016</small>) |industry = Application software |products = PI System {{·}} PI ProcessBook {{·}} PI Server {{·}} PI DataLink {{·}} PI Vision |homepage = {{Url|osisoft.com}} }} '''OSIsoft, LLC''' was 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;<ref>{{Cite news|url=https://www.ft.com/content/a85ae32c-bf0e-4d8f-9983-3a287c6189c7|title=Aveva to buy US tech group OSIsoft in $5bn deal|last1=Provan|first1=Sarah|last2=Fildes|first2=Nic|date=August 25, 2020|work=Financial Times|access-date=August 25, 2020}}</ref> the purchase was subsequently completed on 19 March 2021 for a final consideration of £3,831.4 million.<ref>{{Cite web|title=Completion of Acquisition of OSIsoft, LLC|url=https://tools.eurolandir.com/tools/Pressreleases/GetPressRelease/?ID=3885136&lang=en-GB&companycode=uk-avv&v=|access-date=2021-09-24|website=tools.eurolandir.com|archive-date=2021-07-09|archive-url=https://web.archive.org/web/20210709183019/https://tools.eurolandir.com/tools/Pressreleases/GetPressRelease/?ID=3885136&lang=en-GB&companycode=uk-avv&v=|url-status=dead}}</ref><ref>{{Cite web|title=Annual Report 2021|url=https://investors.aveva.com/annualreport/docs/Annual_Report_2021.pdf|access-date=24 September 2021|website=AVEVA}}</ref>
==History== On January 5, 2011, OSIsoft announced a $135 million minority investment by Technology Crossover Ventures and Kleiner Perkins Caufield & Byers.<ref>{{Cite press release|url=http://www.businesswire.com/news/home/20110105006161/en/OSIsoft-Announces-135-Million-Minority-Investment-Technology|title = News}}</ref>
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.<ref>[http://www.kqed.org/a/kqednews/RN201201180633/c KQED Jan 18 2012 OSIsoft and Lit San Leandro Bringing Fiber-Optic to Tech Firms]</ref>
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Category:Time series software Category:Data analysis software Category:Data and information visualization software Category:Manufacturing execution system software Category:Software companies established in 1980 Category:Software companies based in the San Francisco Bay Area Category:Companies based in San Leandro, California Category:1980 establishments in California Category:Defunct software companies of the United States Category:2021 mergers and acquisitions