Steel Dynamics Set To Join S&P 500 Replacing Abiomed; Super Micro Computer To Join S&P MidCap 400 Replacing Steel Dynamics

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.