49% — Will Trump nominate Stephen Hahn as FDA commissioner
Kalshi 49% · 2 contracts · $3K volume · low confidence
Updated 2026-08-24 00:40:39 UTC

Why this matters:
This market measures the likelihood that President Trump will nominate Stephen Hahn as FDA commissioner during his current administration. Hahn, a former FDA commissioner under Trump (2019-2021), is currently considered a lower-probability candidate compared to Kyle Diamantas, who leads at 28%. The market pricing reflects uncertainty about Trump's final nomination decision, which remains unmade. Key drivers of Hahn's relatively lower probability include active competition from other candidates receiving higher trading interest, the FDA commissioner role's prominence making it difficult to predict Trump's preference among multiple qualified contenders, and limited recent public signals about Hahn's interest or Trump's intentions toward him specifically. The outcome will be definitively resolved once Trump formally nominates and announces a candidate—an event with no confirmed timeline but typically occurring within the first few months of a presidency. Until then, traders are pricing in base rates of FDA candidate viability alongside any available reporting about candidate positioning.

Key factors:
- Hahn's 28% probability ranks below the leading candidate (Kyle Diamantas at 28%) and significantly above mid-tier candidates like Mehmet Oz (14%), suggesting moderate but not primary consideration among contract participants
- No scheduled announcement date has been publicly confirmed for Trump's FDA commissioner nomination, creating open-ended uncertainty that may persist for months
- Hahn previously served as FDA commissioner (2019-2021), providing track record and familiarity that could either support or disfavor a second nomination depending on Trump's assessment
- Trading volume across most contracts remains minimal ($0 24h volume on six of seven listed candidates), indicating thin liquidity and potentially unrepresentative pricing
- The multi-outcome structure means Hahn must compete against six other named candidates plus potential unlisted nominees, with limited information about Trump's actual preference distribution

Contracts:
- Will Trump nominate Heidi Overton as FDA commissioner?: Heidi Overton — 94¢ Kalshi $3K (weight 93%)
- Will Stephen Ferrara be nominated for FDA commissioner before Jan 20, 2029?: Stephen Ferrara — 3¢ Kalshi $201 (weight 7%)

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## 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.

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*Last verified: 2026-08-20T19:20:53.068Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "49% per prediction markets (SimpleFunctions, August 2026)"
Canonical: https://simplefunctions.dev/answer/fdanom
Full data: https://simplefunctions.dev/api/public/query?q=Will%20Trump%20nominate%20Stephen%20Hahn%20as%20FDA%20commissioner
Provider: SimpleFunctions — https://simplefunctions.dev