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In a year-long series, The Wall Street Journal exposed and analyzed the underbelly of Silicon Valley's technology boom with powerful reporting that triggered action by federal regulators, the nation's largest drugstore chain and major retailers. Among the many highlights was an expose of blood-testing firm Theranos Inc., detailing how the nation's largest private health-care company hit technological snags—with employees filing complaints with regulatory agencies alleging the company concealed problems—as it performed millions of blood tests on patients. The articles selected here—from dozens of stories, infographics and videos in the Journal's “Private Risk” series—also revealed how technology firms fudge their finances; how private tech shares are improperly traded in a shadowy market; and how millions of American own shares of private tech firms through their mutual funds with no idea about what they're actually worth.