The French Socialist and social-democratic primary for the 2027 presidential nomination features five candidates—Olivier Faure, Raphaël Glucksmann, Jérôme Guedj, Emmanuel Maurel, and Ségolène Royal—in a two-round electronic vote among roughly 140,000 registered participants. Trader consensus favoring a runoff reflects the fragmented field and absence of any candidate approaching a first-round majority. Recent televised debates have highlighted persistent divisions between party wings without producing consolidation behind one frontrunner, while Glucksmann leads national polling but trails in projected first-round support relative to the combined field. Historical patterns in comparable left primaries and the requirement for an absolute majority in the initial round further support expectations that the contest will advance to the October 16-17 runoff.