Which party will gain most seats in Russian Parliamentary Election?

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Market context

Russia’s 2026 State Duma election is the real-world event behind this market, with 450 seats at stake and voting scheduled for 18–20 September 2026. The crowded-implied 69% YES reflects the expectation that United Russia will again finish first and add the most seats, even if the absolute gain is modest rather than dramatic. Recent polling and seat projections still point to a dominant incumbent baseline: FOM’s February projection had United Russia on 265 seats, well ahead of KPRF on 67, LDPR on 60, New People on 32 and A Just Russia–For Truth on 26.[1]

Historical comparables matter because Russian parliamentary contests have repeatedly produced an entrenched pro-Kremlin majority, with the main uncertainty usually about the scale of the win rather than the identity of the top gainer. Independent projection models and poll aggregators also still show United Russia comfortably ahead, with seat estimates clustering around the low-300s and other parties competing for smaller changes in representation.[4][5] That makes a challenger upset structurally difficult unless the party-list vote, single-member district selection, or candidate registration process shifts materially before polling day.[6][11]

The main catalysts to watch are the final candidate lists, the district map and any late changes to ballot access, because those determine how much of the 450-seat chamber is realistically contestable.[6][11] Polling updates in the run-up to the vote will also matter, especially whether United Russia’s projected seat total moves enough to narrow or widen its margin over the rest of the field.[1][4] Any official scheduling changes, turnout drives, or evidence of stronger-than-expected support for New People or the LDPR could affect the market, but the current setup still favours United Russia as the most likely party to gain the most seats.[1][5][7]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Football-specific comparison page for Which party will gain most seats in Russian Parliamentary Election?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi (US-focused) or Manifold (play-money).

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