The movement founded by Jean-Luc Mélenchon, la France Insoumise (FI), secured 17 seats, enough for a group in the National Assembly.

and Marine Le Pen of the National Front (FN) advanced to the runoff after placing first and second, respectively, and were followed closely by François Fillon of the Republicans (LR) and Jean-Luc Mélenchon of la France Insoumise (FI).

Voting in metropolitan France (as well as the French overseas departments and territories of Mayotte, New Caledonia, Réunion and Wallis and Futuna) took place from 08:00 to 18:00 or 20:00 (local time) on Sunday 11 June.

No "double investiture" was permitted, though the original requirement of prospective candidates to leave their previous political party was waived by Macron on 5 May.

For nominations sought by those in the political world, the popularity, establishment, and ability to appear in the media of applicants are also considered, with the most difficult cases adjudicated by Macron himself.

To represent themselves under the label of La République En Marche!, however, outgoing deputies must decide to leave the Socialist Party (PS) or the Republicans (LR).

[17] The delay was attributed to an influx of applications following Macron's victory in the presidential election – more than a thousand, bringing the total to over 16,000 – with additional complexity arising from the interest of former Prime Minister Manuel Valls in standing as a La République En Marche!

[21] Numerous candidates were invested in error, including Mourad Boudjellal, François Pupponi, and Augustin Augier, who did not apply; Stéphane Saint-André [fr], an outgoing PRG deputy who renounced his investiture and raised concerns about the potential appointment of Édouard Philippe as prime minister; and Thierry Robert, an outgoing deputy who contravened the requirement of not having a criminal history.

[26] After the selection of ministers to the newly formed government on 17 May, the movement announced that it would not invest candidates in 56 constituencies, hoping to protect a number of those on the left and right who had expressed support but not rallied, with the possibility of adjustments before the deadline on 19 May.

[28][29] After François Bayrou endorsed Macron in February, the Democratic Movement (MoDem), which he leads, was reportedly to receive 90 constituencies, of which 50 were considered winnable, for its candidates.

[32] On 12 May, Bayrou announced that he had secured a "solid and balanced" draft agreement, claiming that his party would ultimately obtain a bit more than a hundred investitures.

[33] A MoDem candidate replaced Gaspard Gantzer [fr], former communications advisor to Hollande, in Ille-et-Vilaine's 2nd constituency after fierce objections by local activists and his renunciation of the investiture, which he claimed he did not apply for,[34] and mayor of Mont-de-Marsan Geneviève Darrieussecq and Senator Leila Aïchi, both members of the MoDem executive bureau, received investitures.

Though it preserved the plans to eliminate the 35-hour workweek and reform to the solidarity tax on wealth (ISF) on which he campaigned, it differed on terrorism, immigration, family, and European policy.

[40] On 15 May, some 173 LR and UDI elected officials and personalities, including Jean-Louis Borloo, Nathalie Kosciusko-Morizet, Christian Estrosi, and Thierry Solère, appealed to their fellows to "respond to the hand extended by the president", after which the Republicans published a counter-appeal, insisting that "France needs more than ever a majority of the right and centre in the National Assembly".

[41] On 20 May, Baroin launched the campaign of the Republicans at the Bois de Vincennes, determined to impose cohabitation upon Macron and provide him with the "majority needed by France", a goal complicated by the inclusion of LR personalities in the formation the cabinet, and principally by the selection of Édouard Philippe as Prime Minister.

Meanwhile, the appointment of three LR personalities as ministers in the government – Édouard Philippe, Bruno Le Maire, and Gérald Darmanin – in its attempt at a recomposition of politics infringed upon the space occupied by the party.

[44] Some 50 constituencies were planned to be possibly contested by joint candidacies with Debout la France (DLF) following the rallying of Nicolas Dupont-Aignan to Le Pen after the second round of the presidential election,[45] but on 14 May the FN announced the suspension of the agreement, intending to invest candidates in all 577 constituencies as a result, reversing the "principle of accord" on joint investitures that had been agreed upon earlier.

[48] Among the list of 553 candidates already invested by the FN include Florian Philippot in Moselle's 6th, Gilbert Collard in Gard's 2nd, Stéphane Ravier in Bouches-du-Rhône's 3rd, Wallerand de Saint-Just in Paris's 13th, and Sophie Montel in Doubs's 4th.

[50] Le Pen herself was reluctant to introduce herself as a candidate after her defeat in the presidential election, with initial hopes of 80 to 100 deputies within the FN revised sharply downwards to 15 target constituencies.

[53] Following the victory of Macron in the presidential election, Le Pen stated that she did not deem the proposed reform of the labour code as a priority, criticizing the planned usage of ordonnances as a coup de force and believing that amending it to allow greater flexibility was nothing more than a demand of large employers.

[57] However, on 9 May, campaign spokesman Manuel Bompard said that there would be no accord between the two parties in the legislative elections and blamed the PCF for the failure to reach an agreement.

[59] The first wave of 395 Socialist candidates for the legislative elections was invested on 17 December 2016, including a number who supported of the candidacy of Emmanuel Macron in the presidential election, such as Alain Calmette [fr] in Cantal's 1st, Olivier Véran in Isère's 1st, Jean-Louis Touraine in Rhône's 3rd, Corinne Erhel in Côtes-d'Armor's 5th, Richard Ferrand in Finistère's 6th, Jean-Jacques Bridey in Val-de-Marne's 7th, Stéphane Travert in Manche's 3rd, and Christophe Castaner in Alpes-de-Haute-Provence's 2nd constituency.

[60] Of the outgoing deputies invested by La République En Marche!, Frédéric Barbier, deputy for Doubs's 4th constituency, was the only one to also remain invested by the PS; Christophe Borgel [fr], national secretary of elections for the Socialist Party, stated that Barbier would retain his investiture as he was the "best to fight the National Front".

[63] On 9 May, the national bureau of the Socialist Party approved its three-page platform for the legislative elections entitled "a clear contract for France, a constructive and solidary left".

It abandoned many of the proposals of its defeated presidential candidate Benoît Hamon and drew a number of red lines with regard to the program of Emmanuel Macron, refusing to allow the reform of the labour code by ordonnance and abolition of the solidarity tax on wealth (ISF) on non-property assets.

[64] Hamon himself chose to support candidates running against prominent reformists invested by the Socialist Party, backing Michel Nouaille of the French Communist Party (PCF) against former Prime Minister Manuel Valls, whom he defeated in the presidential primary; the feminist Caroline de Haas [fr] of EELV/PCF against Myriam El Khomri, namesake of her labour law; Philippe Rio of the PCF against Malek Boutih, a Socialist running under the banner of the presidential majority (having been denied an investiture) who violently denounced Hamon as a candidate who would "resonate with a fringe Islamic-leftist";[65][66] and Salah Amokrane of the EELV against Gérard Bapt, who made a controversial trip to Syria with three other parliamentarians in 2015.

[65] In an interview on 22 May, Cambadélis envisaged a potential renaming of the PS, stating that the party should "refound, reformulate, and restructure" to respond to the demand for the "renewal, social justice and ecology", after previously resisting the idea in 2014 when the possibility was mentioned by Valls while Prime Minister.

[71] Negotiations between the two failed to produce an agreement, and on 9 May la France Insoumise announced that it would continue on in the legislative elections without allying with the PCF.

[87] Because the Ministry of the Interior did not report results separately for EELV, the "total vote" percentage listed below is for all ecologist candidates.

The formation of two parliamentary groups on the right represented a symbolic divorce to the two threads on the right (the moderates and the hardliners) and the end of the old Union for a Popular Movement (UMP) which had been created in 2002 to unite the right and centre.