What This Event Is About
This is a multi-outcome prediction market tracking which party will win the senate in 2026. Each candidate has their own separate YES/NO market. Traders can buy YES on candidates they believe will win, or NO on candidates they think will lose. The outcome will be determined based on official announcements and credible reporting.
Market prices reflect real-time trader sentiment based on polling data, endorsements, fundraising numbers, debates, and major political developments. Trading volume of $4.0M shows significant market interest with 4,049 active participants.
This page tracks market sentiment, not official polls or endorsements.
Candidate Markets & How to Read Them
1Each candidate has their own YES/NO market - you can buy YES (they win) or NO (they don't).
2Probabilities across candidates do not need to sum to 100%. You can bet YES on multiple candidates or NO on all of them.
3Prices reflect current market belief, not vote share, polls, or official projections.
4Use the Crowd vs Money signals above to contextualize what the odds mean.
How Markets Resolve This Event
- ✓Resolution is based on official announcements and credible sources.
- ✓Publicly verifiable sources and official results are used for resolution.
- ✓This market will resolve according to the party that wins control of the United States Senate in the 2026 United States midterm election.
A party wins control of the United States Senate if it wins a majority of the chamber’s voting seats. If no party wins a majority of voting seats, the party that wins control of the chamber is the party that wins half of the voting seats and holds the Vice Presidency. If the outcome remains ambiguous after applying the above criteria, the chamber will be deemed controlled by the party with which the first selected President Pro Tempore of the Congress that convenes after the specified election is affiliated.
The following rules govern the counting of seats for determining which party wins control of the chamber.
All regular and special Senate elections that determine representation in the upcoming 120th Congress and are scheduled to take place in November 2026 as of October 31, 2026 are included. Runoffs for qualifying elections will determine attribution of the relevant seat, even if they take place after November 2026. Vacant seats for which no election or special election to fill the seat is scheduled to take place in November 2026 as of October 31, 2026 will be treated as held by the party affiliation of the most recent member to hold that seat.
For seats contested in the specified election, seats are attributed to the party under which the member was elected. If a member-elect changes party affiliation, or vacates their seat, between election day and the formal organization of Congress, the seat is attributed to the party under which the member was elected.
For seats not contested in the specified election, seats are attributed to the party that holds the seat as of the date of the election. If a current sitting member of the U.S. Senate who is not up for election changes party affiliation or vacates their seat after the date of the election, the seat is attributed to the party under which the member was affiliated at the time of the election.
Senate members elected as independents who formally caucus with, or, for newly elected members, who announce their intent to caucus with, a party are included in that party’s count. If the caucus decisions of members of the Senate elected as independents cannot be determined on the date of the election, this market may remain open until the earlier of (i) an announcement from the relevant members of their intents to caucus, or (ii) January 4th, 11:59 PM ET of the following calendar year. If no such announcement is made by January 4th, 11:59 PM ET of the following calendar year, the member will not count towards the seat count of any party.
The resolution sources for this market will be official information from relevant state electoral authorities, the United States Congress, and a consensus of credible reporting.
⚠️ Understanding resolution rules is essential before trading.
How accurate is Polymarket? See how markets compare to polls →
