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yesterday

Trade Desk to Join S&P 500 Following Synopsys’s $35 B Ansys Acquisition

Trade Desk’s off-cycle inclusion compels S&P 500–tracking funds to buy its shares

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S&P 500 inclusion gave The Trade Desk stock a fresh jolt of investor interest.

Overview

  • S&P Dow Jones Indices confirmed that The Trade Desk will replace ANSYS in the S&P 500 effective prior to the market open on July 18, 2025.
  • The unscheduled swap follows Synopsys’s securing of Chinese regulatory approval on July 14 to complete its $35 billion acquisition of ANSYS around July 17.
  • Trade Desk shares jumped about 14% in extended trading on Monday after the inclusion announcement drove substantial demand.
  • Off-cycle index changes require S&P 500–tracking funds to purchase the new member, which boosts liquidity and broadens investor exposure.
  • With a market capitalization around $37 billion, The Trade Desk meets S&P 500 criteria for profitability, public float and liquidity, placing it mid-index by valuation.