Raphaël Glucksmann leads the 2026 French Socialist Party presidential primary first-round market at 82.5 percent implied probability, reflecting his established polling advantage in the social-democratic space, recent high-profile endorsements including from former Paris mayor Anne Hidalgo, and party figures such as Boris Vallaud. His pro-European platform, emphasis on green industrial investment, and refusal to broaden the contest beyond the PS–Place publique framework have consolidated support ahead of the October 9–10 vote. Olivier Faure’s late August entry at 13.5 percent introduced competition as Socialist Party first secretary, yet his lower standalone polling and internal party dynamics have limited gains. Lower-probability candidates including Jérôme Guedj, Ségolène Royal, Emmanuel Maurel, and Philippe Brun trail further, constrained by narrower profiles and limited momentum in the closing weeks before candidate declarations close on September 15.