90% — Who will attend the NATO Summit
Leader: Marco Rubio at 90% · Polymarket 90% · 3 contracts · $28K volume · medium confidence
Updated 2026-06-08 06:11:58 UTC

Tracks the leading outcome in a winner-take-all prediction market set with 3 outcomes.

Why this matters:
This probability reflects market expectations that Donald Trump will attend the 2026 NATO Summit. The 93% price suggests traders view his attendance as highly likely, though not certain. Trump's political position and schedule would primarily drive changes to this probability. Key variables include whether Trump faces scheduling conflicts, domestic political obligations, or health issues that could prevent attendance. The summit date itself will be the primary resolution event—once the NATO Summit occurs and attendance is confirmed or not, this question resolves. Current market depth is modest, with significant volume concentrated in the Trump contract versus alternatives like Marco Rubio (52¢) or JD Vance (18¢), suggesting less active price discovery on who the alternative attendee might be if Trump doesn't participate.

Key factors:
- NATO Summit date and Trump's confirmed calendar commitments at that time
- Whether Trump holds office or campaign position in June 2026 affecting his availability and diplomatic role
- Historical precedent of U.S. leadership attendance at NATO summits and Trump's prior participation patterns
- Volume concentration in Trump contract (93¢) versus alternatives suggests limited market consensus on backup scenarios
- Polymarket contract liquidity and volume trends ($2119 in Trump contract 24h volume) indicating information flow and trader confidence

Contracts:
- Who will attend the NATO Summit?: Marco Rubio — 90¢ Polymarket $18K (weight 67%)
- Who will attend the NATO Summit?: Donald Trump — 82¢ Polymarket $9K (weight 32%)
- Who will attend the NATO Summit?: JD Vance — 11¢ Polymarket $178 (weight 1%)

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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: 2026-06-08T05:20:08.947Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "90% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/who-attend-nato-summit
Full data: https://simplefunctions.dev/api/public/query?q=Who%20will%20attend%20the%20NATO%20Summit
Provider: SimpleFunctions — https://simplefunctions.dev