OSIsoft

{{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}}{{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}}

|fate = Acquired

|successor = Aveva

|location = San Leandro, California, USA

|key_people = J. Patrick Kennedy (CEO)
Michael Siemer (President)

|num_employees = >1300 (2016)

|industry = Application software

|products = PI System {{·}} PI ProcessBook {{·}} PI Server {{·}} PI DataLink {{·}} PI Vision

|homepage = {{Url|osisoft.com}}

}}

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;{{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}} the purchase was subsequently completed on 19 March 2021 for a final consideration of £3,831.4 million.{{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}}{{Cite web|title=Annual Report 2021|url=https://investors.aveva.com/annualreport/docs/Annual_Report_2021.pdf|access-date=24 September 2021|website=AVEVA}}