He won the Pulitzer Prize twice and helped expose the fraudulent practices of the multibillion-dollar blood-testing company Theranos in a series of articles published in The Wall Street Journal.

[7][8][9] Holmes turned to Rupert Murdoch, whose media empire includes Carreyrou's employer, The Wall Street Journal, to kill the story.

Murdoch, who became the biggest investor in Theranos in 2015 as a result of his $125 million injection, refused the request from Holmes saying that "he trusted the paper's editors to handle the matter fairly".

[20] In 2003, Carreyrou won the German Marshall Fund's Peter R. Weitz Junior Prize for excellence in reporting on European affairs for his detailed coverage of the downfall of Vivendi Universal SA and its chairman, Jean-Marie Messier.

[21] In 2004, Carreyrou shared the German Marshall Fund's Peter R. Weitz Senior Prize for excellence in reporting on European affairs with a team of six Wall Street Journal journalists.

[22] In the five-part series titled The Disintegration of the Trans-Atlantic Relationship over the Iraq War Carreyrou contributed the article In Normandy, U.S.-France Feud Cuts Deep.

[34][35] A book-length treatment titled Bad Blood: Secrets and Lies in a Silicon Valley Startup (2018)[36] won the Financial Times and McKinsey Business Book of the Year Award.