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.

They have also proposed providing a high-speed fiber-optic network for the industrial corridor in nearby Hayward.