On 24 June 2017, Richard Ferrand was elected La République En Marche group president with 306 votes and two abstentions.

Pacôme Rupin, Coralie Dubost, Danièle Hérin and Gilles Le Gendre were selected as the group's initial vice presidents; Aurore Bergé, Stanislas Guerini, Olivia Grégoire and Hervé Berville as spokespersons; and Guillaume Gouffier-Cha and Stéphanie Do as treasurers.

De Rugy was elected President of the National Assembly the same day; former Prime Minister Manuel Valls announced his intention to leave the Socialist Party and seek to affiliate with the LREM parliamentary group.

[4] On 5 September, M'jid El Guerrab left the group and party after his physical assault of Socialist Boris Faure.

132 of the electoral code; a by-election was subsequently held in her constituency in 2018 to fill the vacant seat.