Tanium is the Usain Bolt of cybersecurity: Its search-engine-like software scours corporate networks for all connected machines, plotting the contours in a blazingly fast relay that lets IT managers query and patch computers in seconds (vs. days for rivals). Valued at $3.5 billion, Tanium has raised $300 million, mostly from Andreessen Horowitz (one of the VC firm’s biggest investments). Tanium’s sales tripled in 2015, and it’s stealing market share from established names, such as Symantec. J.P. Morgan Chase named Tanium to its “hall of innovation” for helping enhance the bank’s systems management. Other customers include Target, Amazon, and Verizon.