Steel Dynamics Set to Join S&P 500; Super Micro Computer to Join S&P MidCap 400

S&P MidCap 400 constituent Steel Dynamics Inc. (NASD:STLD) will replace Abiomed Inc. (NASD:ABMD) in the S&P 500 and Super Micro Computer Inc. (NASD:SMCI) will replace Steel Dynamics in the S&P MidCap 400 effective prior to the opening of trading on Thursday, December 22 . S&P 500 constituent Johnson & Johnson (NYSE: JNJ) is acquiring Abiomed in a deal expected to close soon pending final conditions.

Following is a summary of the changes that will take place prior to the open of trading on the effective date:

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