Charles River Laboratories International Set to Join S&P 500; Others to Join S&P MidCap 400 and S&P SmallCap 600

5/10/21 6:37:00 PM ET

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NEW YORK, May 10, 2021 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P 500, S&P MidCap 400, and S&P SmallCap 600:

S&P MidCap 400 constituent Charles River Laboratories International (NYSE:CRL) will replace FLIR Systems Inc. (NASD:FLIR) in the S&P 500, S&P SmallCap 600 constituent National Storage Affiliates Trust (NYSE:NSA) will replace Charles River Laboratories International in the S&P MidCap 400, and Ellington Financial Inc. (NYSE:EFC) will replace National Storage Affiliates Trust in the S&P SmallCap 600 effective prior to the opening of trading on Friday, May 14. S&P 500 constituent Teledyne Technologies Inc. (NYSE:TDY) is acquiring FLIR Systems in a deal to be completed soon pending final closing conditions.

Aspen Technology Inc. (NASD:AZPN) will replace Avanos Medical Inc. (NYSE:AVNS) in the S&P MidCap 400, and Avanos Medical will replace Aegion Corp. (NASD:AEGN) in the S&P SmallCap 600 effective prior to the opening of trading on Monday, May 17. New Mountain Capital LLC is acquiring Aegion in a deal expected to be completed soon pending final closing 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
May 14, 2021	S&P 500	Addition	Charles River Laboratories Intl	CRL	Health Care
	S&P 500	Deletion	FLIR Systems	FLIR	Information Technology
	S&P MidCap 400	Addition	National Storage Affiliates Trust	NSA	Real Estate
	S&P MidCap 400	Deletion	Charles River Laboratories Intl	CRL	Health Care
	S&P SmallCap 600	Addition	Ellington Financial	EFC	Financials
	S&P SmallCap 600	Deletion	National Storage Affiliates Trust	NSA	Real Estate
May 17, 2021	S&P MidCap 400	Addition	Aspen Technology	AZPN	Information Technology
	S&P MidCap 400	Deletion	Avanos Medical	AVNS	Health Care
	S&P SmallCap 600	Addition	Avanos Medical	AVNS	Health Care
	S&P SmallCap 600	Deletion	Aegion	AEGN	Industrials

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