Kalshi launches a never-expiring stock-index contract tied to the 500 largest U.S. companies

Kalshi adds a stock-index contract

Kalshi has launched a stock-index contract tied to the 500 largest U.S. companies that never expires, according to Nasdaq.com.

The product is the lead story in the Oct 13, 2026 update published at 7:39 AM ET. The supplied summary notes that no significant new headline emerged in the preceding 15 minutes, and that the launch falls into a different category from the last three editions.

The central feature for prediction-market readers is the absence of an expiration date. That makes the contract’s duration a key consideration when assessing how it works.

Nasdaq.com’s full article was unavailable in the supplied material. The headline and summary do not explain the contract’s pricing, settlement mechanics or how it tracks the companies, limiting what can be established about its operation.

What it means for prediction markets

• Duration is the distinguishing feature: The contract never expires; the available material does not specify how positions are closed or settled.
• The reference is stock-market performance: The contract is tied to the 500 largest U.S. companies, but the supplied information does not identify an index methodology.
• Product details remain essential: Without the contract rules, readers cannot establish how its quoted prices should be interpreted or compared with those of dated event contracts.