Talen Energy up on addition to S&P MidCap 400

Talen Energy jumped Tuesday after it was tapped to take the place of Interactive Brokers in the S&P MidCap 400 Index as a result of the options trader being calling up to the blue-chip big leagues.

Talen is a Texas-based power producer and distributor best known for signing a deal to provide nuclear power for Amazon data centers in Pennsylvania.

The stock has been a cornerstone of the AI power trade. But more recently, the relentless demand for power to feed data centers shows signs of pushing consumer prices up more broadly.

That’s putting power producers — especially those like Talen with growing footprints in data-center-heavy parts of the country — in the catbird seat from a pricing perspective, which the market seems to love. (Other AI power plays include Vistra, Constellation Energy, NRG, and GE Vernova, a maker of turbines for power plants that’s up almost 90% this year.)

For their part, Talen shares are also up nearly 90% so far in 2025 and have gained more than 600% over the last two years.

That two-year run has created some $15 billion in market wealth, giving Talen a market cap of more than $17 billion. It’s this expansion that qualifies Talen for inclusion in the S&P MidCap 400, which requires companies to be worth between $8 billion and $23 billion to be added.