19% — Will Philippe Brun win the primary to select the French pôle socialiste’s candidate for the 2027 presidential election
Kalshi 19% · 4 contracts · $29 volume · medium confidence
Updated 2026-08-10 00:11:38 UTC

Why this matters:
This represents the estimated likelihood that Philippe Brun will emerge as the Socialist Party's official candidate for France's 2027 presidential election. Brun is positioned as a moderate alternative in a crowded primary field that includes Raphaël Glucksmann (13¢), Olivier Faure (20¢), and several former prime ministers. His 14% probability reflects limited current visibility compared to better-known candidates, though primary dynamics remain fluid. The party's selection process and endorsements from regional federations will significantly influence outcomes. Key catalysts include any formal campaign announcements, party convention decisions, and polling developments among socialist voters in the coming months leading to the primary vote.

Key factors:
- Brun currently has lower name recognition and media coverage than leading contenders like Glucksmann and Faure based on contract pricing disparities
- Olivier Faure's 20¢ contract indicates perceived frontrunner status, with other candidates (Glucksmann 13¢, Brun 14¢) clustered within narrow margins
- The primary outcome depends on Socialist Party internal voting mechanisms and endorsement patterns from regional party sections, which remain unpredictable
- Trading volume on Brun's contract is relatively moderate, suggesting limited market conviction and significant uncertainty remaining
- Former prime ministers like Cazeneuve and Hollande retain establishment credibility despite lower current odds, potentially fragmenting the moderate vote

Contracts:
- Will Raphaël Glucksmann win the primary to select the French pôle socialiste’s candidate for the 2027 presidential election?: Raphaël Glucksmann — 27¢ Kalshi $29 (weight 100%)
- Will Boris Vallaud win the primary to select the French pôle socialiste’s candidate for the 2027 presidential election?: Boris Vallaud — 35¢ Kalshi $0 (weight 0%)
- Will François Hollande win the primary to select the French pôle socialiste’s candidate for the 2027 presidential election?: François Hollande — 8¢ Kalshi $0 (weight 0%)
- Will Olivier Faure win the primary to select the French pôle socialiste’s candidate for the 2027 presidential election?: Olivier Faure — 5¢ Kalshi $0 (weight 0%)

---

## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

---

*Last verified: 2026-08-09T23:20:49.240Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "19% per prediction markets (SimpleFunctions, August 2026)"
Canonical: https://simplefunctions.dev/answer/frpsnom
Full data: https://simplefunctions.dev/api/public/query?q=Will%20Philippe%20Brun%20win%20the%20primary%20to%20select%20the%20French%20p%C3%B4le%20socialiste%E2%80%99s%20candidate%20for%20the%202027%20presidential%20election
Provider: SimpleFunctions — https://simplefunctions.dev