Next Prime Minister of Sweden

Platform comparison

Active sub-markets

Market context

Parliamentary elections to elect Sweden’s 349-member Riksdag are set for 13 September 2026, with the newly elected parliament subsequently choosing the next Prime Minister. The market currently implies a 0% chance for any specific candidate, reflecting the fluidity of coalition negotiations that typically follow Swedish elections. Historically, Sweden has seen Prime Ministers emerge from post-election bargaining rather than pre-vote certainty; for instance, the 2018 election required months of negotiation before Stefan Löfven retained office, while the 2022 vote led to Ulf Kristersson’s appointment after complex cross-party deals. Such precedents suggest that early probability assignments are often unreliable, as the final appointee depends on shifting parliamentary arithmetic rather than initial poll standings[1][2].

Traders should monitor coalition announcements, poll shifts, and the Swedish Election Authority’s security measures against foreign malign influence, which could alter the electoral landscape[4]. Recent polling from PolitPro shows Socialdemokraterna leading with 32.4%, but coalition scenarios remain undecided, with no single party likely to secure a majority alone[2]. Key catalysts include the September election date, post-election Riksdag sessions, and any interim caretaker government declarations that do not count for resolution[5]. The Psychological Defence Agency’s ongoing work to safeguard the election adds another dependency, as external interference could delay or reshape outcomes[7]. For platforms like Polymarket versus Kalshi or Betfair, divergence arises in decimal odds versus implied probability displays, fee structures, and KYC requirements, with some books offering clearer coalition scenario breakdowns while others prioritise individual candidate liquidity[2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Next Prime Minister of Sweden from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on PolyGram?

Zero. PolyGram routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.