Embattled blood-testing company Theranos Inc. will have to face a groundbreaking securities lawsuit which seeks to recover losses on a classwide basis for investors who sank money into the privately held company.

In an eight-page order U.S. Magistrate Judge Nathanael Cousins of the Northern District of California largely denied a motion to dismiss claims filed by Theranos’ lawyers at Wilmer Cutler Pickering Hale and Dorr.