SAN JOSE — A federal jury convicted Elizabeth Holmes, the startup founder who claimed to revolutionise blood testing, on four of 11 charges that she conducted a years-long fraud scheme against investors while running Theranos, which ended up as one of Silicon Valley’s most notorious implosions.

The verdict caps a steep fall for the former Silicon Valley star who once graced magazine covers with headlines such as “This CEO is Out for Blood” and emulated Apple co-founder Steve Jobs by wearing black turtlenecks.