Interactive Brokers’ Stock Surges on S&P 500 Inclusion Announcement

NEW YORK, Aug. 25, 2025 - Shares of Interactive Brokers Group Inc. (NASDAQ: IBKR) rallied sharply Monday following the announcement that the electronic brokerage will join the S&P 500 Index, replacing Walgreens Boots Alliance before the market opens Thursday, Aug. 28.

In regular trading, IBKR closed at $62.76, up $0.36, or 0.58%, on volume of 4,173,676 shares.

The stock traded in a range of $62.15 to $63.23 after opening at $62.39.

After hours, the shares climbed further:

• Benzinga reported a 4.33% rise to $65.49 in extended trading.
• CNBC noted a nearly 5% advance following the index decision.
• Bloomberg cited intraday gains of up to 8% in postmarket action.

S&P Dow Jones Indices confirmed that Interactive Brokers will replace Walgreens Boots Alliance in the S&P 500, effective before the open on Thursday, Aug. 28, as Walgreens is set to be taken private by Sycamore Partners. Concurrently, Talen Energy Corp. (NASDAQ: TLN) will fill IBKR’s slot in the S&P MidCap 400.

The inclusion into the S&P 500 marks a significant milestone for Interactive Brokers, whose market capitalization now stands at approximately $27.94 billion. A spot in the benchmark index typically broadens a company’s investor base, attracting both passive funds and institutional mandates that track the S&P 500.

Investor attention has also been drawn to other fintech contenders. Shares of Robinhood Markets Inc. dipped in after-hours trading, as many had anticipated its addition to the index. Meanwhile, AppLovin Corp. traded lower in extended hours despite earlier speculation of its potential inclusion.

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