The Prediction Markets

How many UK parliamentary by-elections in 2026?

Closes
Jan 1, 2027, in 2 months
Traded
$70K
Venues
Polymarket, Kalshi
Prices updated
2 min ago
Share

What the markets expect

6 64%

Next is At least 7 at 41%. The venues list this event, but none of their outcomes are matched yet, so prices are shown separately.

Odds by venue

Consensus blends each venue’s last price, weighted by how much has traded there. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.

Prices come from our regular polls of each venue, the oldest 2 min ago. Ages are as of when this page was built.

  • Polymarket
  • Kalshi
6
64%
Polymarket 64%polled, 2 min agoBest Yes 65¢ on Polymarket, $100 pays $154 (1.54x)
Polymarket
Contract
6
Last price
64%
As of
Polled 2 min ago
Buy Yes
65¢
Sell Yes
63¢
$100 on Yes pays
$154 (1.54x)
Volume
$26K
Trade this on Polymarket
At least 7
41%
Kalshi 41%polled, 2 min agoBest Yes 41¢ on Kalshi, $100 pays $244 (2.44x)
Kalshi
Contract
At least 7
Last price
41%
As of
Polled 2 min ago
Buy Yes
41¢
Sell Yes
35¢
$100 on Yes pays
$244 (2.44x)
Volume
$2K
Trade this on Kalshi
7
29%
Polymarket 29%polled, 2 min agoBest Yes 30¢ on Polymarket, $100 pays $333 (3.33x)
Polymarket
Contract
7
Last price
29%
As of
Polled 2 min ago
Buy Yes
30¢
Sell Yes
28¢
$100 on Yes pays
$333 (3.33x)
Volume
$12K
Trade this on Polymarket
At least 8
12%
Kalshi 12%polled, 2 min agoBest Yes 18¢ on Kalshi, $100 pays $556 (5.56x)
Kalshi
Contract
At least 8
Last price
12%
As of
Polled 2 min ago
Buy Yes
18¢
Sell Yes
10¢
$100 on Yes pays
$556 (5.56x)
Volume
$814
Trade this on Kalshi
At least 9
3%
Kalshi 3%polled, 2 min agoBest Yes 8¢ on Kalshi, $100 pays $1,250 (12.5x)
Kalshi
Contract
At least 9
Last price
3%
As of
Polled 2 min ago
Buy Yes
8¢
Sell Yes
2¢
$100 on Yes pays
$1,250 (12.5x)
Volume
$763
Trade this on Kalshi
8
1.6%
Polymarket 1.6%polled, 2 min agoBest Yes 2.5¢ on Polymarket, $100 pays $4,000 (40.0x)
Polymarket
Contract
8
Last price
1.6%
As of
Polled 2 min ago
Buy Yes
2.5¢
Sell Yes
0.6¢
$100 on Yes pays
$4,000 (40.0x)
Volume
$4K
Trade this on Polymarket
9
0.7%
Polymarket 0.7%polled, 2 min agoBest Yes 1.1¢ on Polymarket, $100 pays $9,091 (90.9x)
Polymarket
Contract
9
Last price
0.7%
As of
Polled 2 min ago
Buy Yes
1.1¢
Sell Yes
0.2¢
$100 on Yes pays
$9,091 (90.9x)
Volume
$2K
Trade this on Polymarket
10+
0.6%
Polymarket 0.6%polled, 2 min agoBest Yes 1¢ on Polymarket, $100 pays $10,000 (100x)
Polymarket
Contract
10+
Last price
0.6%
As of
Polled 2 min ago
Buy Yes
1¢
Sell Yes
0.2¢
$100 on Yes pays
$10,000 (100x)
Volume
$3K
Trade this on Polymarket

Who resolves this market

Polymarket
Polymarket resolves via:
UMA optimistic oracle, source: parliament.uk
Kalshi
Kalshi resolves via:
Kalshi (CFTC-regulated exchange), source: UK Parliament

How the odds have moved

The top 3 outcomes on both venues, with the consensus between them. Hover for exact values.

  • 6
  • At least 7
  • 7

Order books

Each venue’s resting orders for the selected outcome’s Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.

Polymarket

Open on Polymarket ↗

Top of book

Connecting
Best bid
—
Spread
—
Best ask
—

Waiting for the first live quote…

Depth · top 8 levels

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Recent trades

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Kalshi

Kalshi doesn’t list 6 for this event.

What your stake buys

Enter a stake to see where it buys the most after fees, using each venue’s live order book.

$
Buy

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Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.04 × price × (1 − price) per share (politics rate). Fee calculator. Estimates only, not advice.

About this market

Live prediction market odds for "How many UK parliamentary by-elections in 2026?". 6 leads at 64%. Next is At least 7 at 41%. $70K has traded across 8 outcomes on Polymarket and Kalshi. The market is expected to resolve by Jan 1, 2027.

This market will resolve according to the total number of UK parliamentary by-elections held in 2026. Qualifying by-elections must be elections to the UK House of Commons for a vacant parliamentary seat, with polling day scheduled and held within the 2026 calendar year. The resolution source for this market will be a consensus of credible reporting. In case of ambiguity, this market will resolve solely based on official information from the UK Parliament (https://www.parliament.uk/).

Questions

What does the consensus price mean?

It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.

How is the payout worked out?

A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.

Why do the venues show different prices?

Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.

Is a price gap an arbitrage?

Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.

How fresh are these prices?

Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.

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