SAN JOSE, Calif.—The jury weighing fraud charges against former Theranos CEO Elizabeth Holmes conducted a fourth day of deliberations Monday without reaching a verdict. Holmes is facing 11 criminal charges alleging that she duped investors and patients by hailing her company’s blood-testing technology as a medical breakthrough when in fact it was prone to wild errors. The eight men and four women on the jury have been meeting in a San Jose, California, federal courthouse after absorbing reams of evidence during a high-profile trial that has captivated Silicon Valley. Last week, the jurors sent out two notes to U.S. District Judge Edward Davila—one making a swiftly rejected request to take their instructions home with them for further study and another that that allowed them a replay of a 2013 recording of Holmes discussing Theranos’ dealings with prospective investors. The jury completed Monday’s session without providing any clues as to how …