Elizabeth Holmes, the youngest and wealthiest female self-made billionaire, has been found guilty of defrauding investors as founder and CEO of healthcare company Theranos in the US, which promised to revolutionise blood testing.

She is also guilty of conspiracy to defraud investors with her co-defendant and Indian-origin Theranos COO, Sunny Balwani. Holmes faces up to 20 years in prison for each of the counts.