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- American businessperson; a subject of an SEC investigation
A US jury has found Theranos founder Elizabeth Holmes guilty of defrauding investors in the blood-testing startup.
The 37-year-old was convicted on four of 11 counts.
Holmes was convicted of investor fraud and conspiracy, but acquitted on three counts of defrauding patients who paid for tests from Theranos, and a related conspiracy charge.
The jury could not reach a decision on three counts related to other, individual investors.
A sentencing date was not immediately set.
Prosecutors said Holmes swindled private investors between 2010 and 2015 by convincing them Theranos' small machines could run a range of tests with a few drops of blood from a finger prick.
Holmes was also charged with misleading patients about the accuracy of the tests.
Holmes rose to Silicon Valley fame after founding Theranos in 2003 at the age of 19.
She attracted high-profile wealthy investors, including media mogul Rupert Murdoch, and high-profile board members.
Her net worth was estimated at $US4.5 billion by Forbes in 2015.
She faces up to 80 years in prison when sentenced by US District Judge Edward Davila but is likely to receive a much lower sentence.
Holmes was also charged with misleading patients about the accuracy of the tests but was acquitted of those charges.
She is likely to appeal but her lawyers and a representative for the prosecutors did not respond to requests for comment on Monday.
The jury's verdict came after seven days of deliberations.
The case has shed light on Theranos' failed endeavour to revolutionise lab testing.
The company secretly relied on conventional machines manufactured by Siemens to run patients' tests, prosecutors said.
Theranos collapsed after the Wall Street Journal published a series of articles suggesting its devices were flawed and inaccurate.
Holmes was indicted in 2018 alongside Theranos' former chief operating officer Ramesh 'Sunny' Balwani.
Balwani has pleaded not guilty and will be tried at a later date.
During the trial in San Jose, California, which began in September, jurors heard testimony from former Theranos employees who said they left the company after witnessing problems with its technology.
Former patients testified they would not have used Theranos if they had known the tests were flawed.
Investors told the jury Holmes made a range of misleading claims about Theranos, including that its machines were being used in the field by the US military.
Prosecutors said had Holmes been truthful with investors and patients, the venture would not have attracted critical funding and revenue.
"She chose fraud over business failure. She chose to be dishonest," Assistant US Attorney Jeff Schenk said at the start of closing arguments.
"That choice was not only callous, it was criminal."
Testifying in her own defence, Holmes said she never meant to deceive anyone and that Theranos' lab directors were in charge of test quality.
In closing arguments, defence lawyer Kevin Downey said the evidence did not show Holmes was motivated by a cash crunch at Theranos but rather thought she was "building a technology that would change the world".
"You know that at the first sign of trouble, crooks cash out" but Holmes stayed, Downey said.
"She went down with that ship when it went down."