NEW YORK, Dec. 19, 2022 /PRNewswire/ -- 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:

Effective Date

Index Name 

Action

Company Name

Ticker

GICS Sector

December 22, 2022

S&P 500

Addition

Steel Dynamics

STLD

Materials


S&P 500

Deletion

Abiomed

ABMD

Health Care


S&P MidCap 400

Addition

Super Micro Computer

SMCI

Information Technology


S&P MidCap 400

Deletion

Steel Dynamics

STLD

Materials

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