Walgreens is suing Theranos for $140 million

Walgreens has filed suit against Theranos in Delaware district court, asking for $140 million and alleging a breach of contract.

Court filings show that Walgreens is claiming that some of Theranos’ actions violate the non-disclosure agreement and confidentiality agreements that the two companies agreed to. Walgreens successfully moved to seal the complaint, citing the non-disclosure agreement, so the details of the alleged contractual breach are still unknown.

Theranos, once a Silicon Valley darling promising accurate blood tests using only a pinprick, recently closed its labs and fired 340 employees after a series of articles exposed that its technology did not work and was putting patients at risk. The startup and its founder, Elizabeth Holmes, have been hit by a growing number of lawsuits in recent months, including at least eight from patients claiming that its technology caused heart attacks or other health problems. It has also been sued by one of its own investors for fraud.

Walgreens had been one of Theranos’ most high-profile partners, even opening 40 "Theranos Wellness Centers" in its Arizona locations and agreeing to partner before even testing the technology. The drugstore chain stopped expanding its Theranos centers last October and ended the partnership in June. The full complaint is sealed.

Spokespeople for both Walgreens and Theranos were not immediately available for comment.

Read the full motion to seal below.