Filippetti was a delegate of the French Greens for the Paris municipality and acted as the technical adviser for the Minister of the Environment, Yves Cochet, from 2001 to 2002.

[3] On Filippetti's initiative, the National Assembly passed a law in 2013 preventing internet booksellers from offering free delivery to customers, in an attempt to protect the country's struggling bookshops from the growing dominance of US online retailer Amazon.

Filippetti was excluded for 18 months after supporting a dissident list, and announced January, 17th 2018 that she left the Socialist Party and joined Génération.s., the political movement of Benoît Hamon, her former colleague in the French Government.

In 2009, she filed a complaint of domestic violence against him; Piketty apologized for his actions and Filippetti quickly dropped the charges.

[16] In September 2014, Filippetti and Arnaud Montebourg sued Paris Match for invasion of privacy for reporting they are romantically involved; the weekly's cover featured a photo of them during a trip to San Francisco.