Introduction
On election night, news channels take hours to call races. But some markets called the 2026 midterm elections much earlier. These are called prediction markets. People buy and sell shares on what they think will happen. The prices show what the crowd thinks. This year, the crowd was mostly right.
What Happened
A prediction market is like a stock market for events. You buy a share if you think something will happen. A share costs between 1 cent and $1. If you are right, the share pays $1. If you are wrong, it pays nothing. The price tells you the chance. A share at 75 cents means the market thinks there is a 75% chance.
Two big prediction markets are Polymarket and Kalshi. On Polymarket, one trader made $1.3 million on the election. That trader called all 435 House races, 35 Senate races, and 36 governor races early. That is 506 races in total. The markets called most races a median of 31 minutes before news outlets did. Median means the middle value. Some races were called hours early.
The markets also called the big picture right. Polymarket gave Democrats a 91% chance of winning the House and a 76% chance of winning the Senate. Kalshi gave 84% for the House and 70% for the Senate. In the end, Democrats won both the House and the Senate.
Key figures
- 506 races called early by traders on Polymarket.
- 31 minutes: the median lead time over news outlets.
- $1.7 billion traded on House and Senate control on Polymarket.
- $2.8 billion traded on the full midterm market on Polymarket.
- $31 billion traded on Polymarket in 2026, from January to October. That is more than the $19.2 billion traded in all of 2024.
Why It Happened
Prediction markets work because many people put their money where their mouth is. When money is at stake, people think hard. They read polls. They watch early results. They share what they know. All that knowledge goes into one price.
Trading was huge this year. On Polymarket, $1.7 billion was traded on who would control the House and Senate. Another $2.8 billion was traded on the full midterm market. On Kalshi, $1.4 billion was traded on House control and $1.1 billion on Senate control. Big money means the prices are hard to push around.
The markets are also growing fast. Polymarket’s trading volume doubled in 2026 to $31 billion in the first ten months. That is more than the $19.2 billion traded in all of 2024. Polymarket raised $1.3 billion this year and is now worth $20 billion. Kalshi raised $1 billion and is worth $15 billion.
Why It Matters
Prediction markets are becoming a new way to read the news. In some races, they were hours ahead of TV channels. The Associated Press called the last House race at about 3 a.m. on Wednesday. Polymarket had called it nearly 19 hours earlier.
But the markets are not always right. Polymarket gave Democrats a 99% chance of winning the Virginia governor’s race. The Republican won instead. That is a reminder. A 99% chance is not 100%. Surprises still happen.
There were surprises in other races too. In South Carolina, Democrat Annie Andrews beat Republican Darline Graham. The markets had given Graham about a 70% chance. In Texas, Democrat Gina Hinojosa beat Governor Greg Abbott. The markets had given Abbott about a 65% chance.
What Happens Next
Prediction markets will keep growing. The New York Stock Exchange’s parent company, ICE, bought Polymarket for $8 billion. Kalshi announced a $1 billion funding round on October 26. More money means more markets. People will soon be able to bet on many more events.
But there are questions too. Regulators are watching. The CFTC is a U.S. agency that watches financial markets. It is looking into whether Polymarket and Kalshi listed contracts on the war with Iran. Expect more rules as these markets grow.
Final Thoughts
Prediction markets did well in the 2026 midterms. They were fast. They were mostly right. But they are not magic. They are just a new way for many people to share what they think. For students, the lesson is simple. A crowd can be very smart. But even a smart crowd can be wrong. Always check the facts for yourself.
Related post: Kalshi Is Now Worth $40 Billion After Another $1 Billion Funding Round
Disclaimer: This article is for educational and informational purposes only and does not constitute financial advice.
Sources: CNBC and Covers.com.