TL;DRNaly's clearest May 1, 2026 disagreement is Wales: Polymarket prices Plaid Cymru at 73c to win the most Senedd seats and Reform UK at 27c, but we mark those contracts closer to 42c and 56c. The sharpest reason is simple: late-April polling no longer shows a Plaid edge; it shows a near tie or slight Reform lead under the new seat-conversion system.
- Polymarket still prices Plaid Cymru as a clear favorite to win the most seats, but the freshest evidence has cut that edge down to a much tighter race.
- Reform UK at 27c YES still looks too cheap after multiple late-April polls gave it either a tie or a slight lead in the seat race.
- The new six-seat D'Hondt system compresses margins, so tiny vote-share moves can flip the largest-party outcome faster than traders anchored to older polling may expect.
- Coalition viability matters for who governs Wales, but these contracts resolve on who wins the most seats, which is a narrower and more seat-math-driven question.
2 Mispricings at a Glance
Why we disagree: Late-April polling no longer supports a Plaid seat lead, so the market still looks anchored to an earlier regime.
Why we disagree: Reform has moved from outsider to co-favorite or slight leader in fresh polling, but the tape still prices it like a long shot.
How to read this: Polymarket Top Answer and Naly Top Answer show the final answer each side sees as most likely. Max Payout if Correct shows the gross upside from the current quote to the $1 settlement if the selected contract side wins. The horizontal graph still shows where that selected side sits on a 0c to $1 range for Polymarket versus Naly.
