Exchange operator CME Group Inc. on Thursday ended electronic trading of full-size futures contracts for the Dow Jones Industrial Average and Nasdaq-100 stock indexes as part of its plan to shut down most of floor trading by June.

CME announced last month that it would shut down most of its floor trading in Chicago and New York by July 2 as market share for that type of trading dropped to just 1%. Most futures contracts are now traded electronically.

After the announcement, CME immediately removed several equity index product contracts from trading. Others, such as the contracts ended on Thursday, couldn't be delisted without a longer filing period with the Commodity Futures Trading Commission.

The latest change, which went into effect for trade date March 12, was disclosed in a memo dated Feb. 23.

Trading in S&P 500 futures was unaffected.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com

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