Block’s entry into the S&P 500 Index after replacing Hess led to a 10% surge in its shares. This change is the second in the benchmark index announced this week. The addition can boost a company’s stock, as seen with The Trade Desk, which saw a 6% increase since its entry was announced. Datadog also recently joined the index. Shares of Block were down 14% for 2025 through Friday.

Read more at Yahoo Finance: Block Stock Jumps on S&P 500 Inclusion, Replacing Hess