Sweden’s September 2026 election produced a razor-thin 176–173 seat majority for the centre-left bloc of Social Democrats (S), Greens (MP), Centre (C) and Left (V) over the Tidö parties. Negotiations led by Magdalena Andersson have stalled primarily over whether V enters cabinet, a red line for C, leaving single-party S or limited left combinations as the most plausible near-term outcomes under negative parliamentarism. Traders therefore price S alone highest at 21 percent while various S-led coalitions cluster just behind, reflecting both the bloc’s structural edge and persistent internal friction. A failed confidence vote this week and any subsequent speaker consultations could open space for right-leaning alternatives or force further compromises that shift probabilities among the listed coalitions.