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icon for How many UK parliamentary by-elections in 2026?
Politics·UK Labour Leadership

How many UK parliamentary by-elections in 2026?

icon for How many UK parliamentary by-elections in 2026?
Politics·UK Labour Leadership

How many UK parliamentary by-elections in 2026?

6 38%

≤5 36%

9 7.3%

10+ 7.3%

Polymarket

$24,877 Vol.

6 38%

≤5 36%

9 7.3%

10+ 7.3%

Polymarket

$24,877 Vol.

≤5

$7,423 Vol.

36%

6

$9,464 Vol.

38%

7

$3,087 Vol.

7%

8

$2,881 Vol.

4%

9

$916 Vol.

10%

10+

$1,105 Vol.

7%

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/).Recent vacancies have already produced five UK parliamentary by-elections in 2026, triggered by resignations tied to health issues, financial scrutiny, dual-mandate rules after Scottish Parliament elections, and internal party maneuvers such as the Makerfield seat opening for Andy Burnham amid Labour leadership strains. Trader consensus clusters tightly around five or six total because the post-2024 Parliament remains relatively stable without an imminent general election, yet ongoing pressures from polling volatility, ministerial exits, and constituency-level retirements keep the prospect of one or two further writs alive through December. Additional standards investigations, unexpected health announcements, or escalations in Labour internal dynamics could push the count higher, while a quiet final quarter with no new vacancies would cap it at five. Historical patterns of five to seven by-elections annually in non-election years reinforce the narrow spread between the leading outcomes.

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/).
Volume
$24,877
End Date
Dec 31, 2026
Market Opened
Jul 8, 2026, 7:33 PM ET

Resolver

0x69c47De9D...
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/).
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/).Recent vacancies have already produced five UK parliamentary by-elections in 2026, triggered by resignations tied to health issues, financial scrutiny, dual-mandate rules after Scottish Parliament elections, and internal party maneuvers such as the Makerfield seat opening for Andy Burnham amid Labour leadership strains. Trader consensus clusters tightly around five or six total because the post-2024 Parliament remains relatively stable without an imminent general election, yet ongoing pressures from polling volatility, ministerial exits, and constituency-level retirements keep the prospect of one or two further writs alive through December. Additional standards investigations, unexpected health announcements, or escalations in Labour internal dynamics could push the count higher, while a quiet final quarter with no new vacancies would cap it at five. Historical patterns of five to seven by-elections annually in non-election years reinforce the narrow spread between the leading outcomes.

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/).
Volume
$24,877
End Date
Dec 31, 2026
Market Opened
Jul 8, 2026, 7:33 PM ET

Resolver

0x69c47De9D...
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/).

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Frequently Asked Questions

"How many UK parliamentary by-elections in 2026?" is a prediction market on Polymarket with 6 possible outcomes where traders buy and sell shares based on what they believe will happen. The current leading outcome is "6" at 38%, followed by "≤5" at 36%. Prices reflect real-time crowd-sourced probabilities. For example, a share priced at 38¢ implies that the market collectively assigns a 38% chance to that outcome. These odds shift continuously as traders react to new developments and information. Shares in the correct outcome are redeemable for $1 each upon market resolution.

As of today, "How many UK parliamentary by-elections in 2026?" has generated $24.9K in total trading volume since the market launched on Jul 8, 2026. This level of trading activity reflects strong engagement from the Polymarket community and helps ensure that the current odds are informed by a deep pool of market participants. You can track live price movements and trade on any outcome directly on this page.

To trade on "How many UK parliamentary by-elections in 2026?," browse the 6 available outcomes listed on this page. Each outcome displays a current price representing the market's implied probability. To take a position, select the outcome you believe is most likely, choose "Yes" to trade in favor of it or "No" to trade against it, enter your amount, and click "Trade." If your chosen outcome is correct when the market resolves, your "Yes" shares pay out $1 each. If it's incorrect, they pay out $0. You can also sell your shares at any time before resolution if you want to lock in a profit or cut a loss.

The current frontrunner for "How many UK parliamentary by-elections in 2026?" is "6" at 38%, meaning the market assigns a 38% chance to that outcome. The next closest outcome is "≤5" at 36%. These odds update in real-time as traders buy and sell shares, so they reflect the latest collective view of what's most likely to happen. Check back frequently or bookmark this page to follow how the odds shift as new information emerges.

The resolution rules for "How many UK parliamentary by-elections in 2026?" define exactly what needs to happen for each outcome to be declared a winner — including the official data sources used to determine the result. You can review the complete resolution criteria in the "Rules" section on this page above the comments. We recommend reading the rules carefully before trading, as they specify the precise conditions, edge cases, and sources that govern how this market is settled.