How many Republican Senators not running in 2026?

According to the latest prediction market data for the query “How many Republican Senators not running in 2026?”, traders have formed a strong consensus.

Currently, 7 is dominating the market with an overwhelming 63.5% chance of winning. 11 follows in second place at 16.1%, while 5 sits in third with 8.1%. The betting volume for this specific market has already reached $77.5K, reflecting intense industry interest.

To better assess where each potential outcome stands, the market can be segmented into three distinct trading tiers based on implied probability and contract pricing:

🥇 Tier 1: The Dominant Leader

• 7 (63.5%): Currently commanding the highest probability, 7 is heavily favored by the order book. Traders looking to back this outcome face a “Buy Yes” contract price of 64¢, signaling a high degree of market conviction. This contract alone has generated $2.2K in volume.

🥈 Tier 2: The Primary Challengers

• 11 (16.1%): Positioned as the most viable alternative, 11 maintains a 16.1% chance of resolving true. Its “Buy Yes” shares currently trade at 16¢.
• 5 (8.1%): Sitting in third place with a 8.1% probability, the market shows measured skepticism toward 5, treating it as an outside wildcard unless momentum shifts.

🥉 Tier 3: The Long-Tail Options (Combining for ~12.4%)

Beyond the top three choices, a wide field of macro variables and long-shot outcomes are being tracked. While their individual probabilities hover low, they represent crucial hedges for speculative traders:

• Alternative Options: This includes 6 (7.1%), 8 (4.9%), and 10 (1.9%).
• Speculative Volume: Despite low statistical likelihood, certain long-tail contracts like 12+ are still attracting notable interest.

The 2026 U.S. general elections for Congress are scheduled to be held on November 3, 2026.

This market will resolve according to the total number of Republican members of the U.S. Senate who are considered to be retiring or not seeking reelection in 2026.

For the purposes of this market, a member may be considered not to seek reelection if:

• They publicly announce they are retiring from Congress and will not run for reelection to their current seat

• They choose to run for a different elected office in 2026 instead of running for reelection to their current seat

• They do not seek their party’s nomination for reelection to their current seat, meaning they neither file for reelection nor participate in their party’s nominating process (such as a primary, convention, or caucus)

Only members whose current term is scheduled to end with the 2026 regular election for the Senate may qualify for this market.

This market will not resolve until after the relevant final 2026 candidate filing deadline has passed in all states, which is expected to occur in late August 2026.

The resolution source for this market will be a consensus of credible reporting.

While human consensus and speculative volume shape the broader prediction market, our quantitative algorithms offer a data-driven counter-perspective. By analyzing fundamental signals, underlying trends and historical distributions, our AI Valuation model calculates an independent “Fair Value” probability for each outcome.

Comparing this Fair Value against the current Trade Value uncovers major disparities — known as the Expected Value (EV) Gap. Contracts with a positive EV Gap represent statistically underpriced outcomes, whereas a negative EV Gap flags a potential market overreaction.

Top AI Alpha & Mispriced Arbitrage Opportunities

Based on the latest data model run, several key contracts stand out with significant deviations:

• The Most Overvalued Outcome 7 currently trades at 63.5%, but our AI places its Fair Value at just 33.4%. This creates a large negative EV Gap of -30.1%, suggesting the crowd may be overhyping this outcome and driving the premium too high.
• The Best Value Play (Highest EV) Our model identifies 6 as the premium value opportunity on the board. While the market only assigns it a 7.1% trading probability, our AI’s Fair Value assessment sits at 42% — yielding an impressive +34.9% EV Gap.
• Under-the-Radar Dark Horses Other notable discrepancies include 5 (EV Gap: +5.1%) and <5 (EV Gap: +1.3%). These long-tail opportunities are heavily discounted by the live order books despite stronger statistical backing from our predictive model.