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Investing.com-- Air conditioning maker Lennox International Inc (NYSE: LII ) will join the S&P 500 from next week, S&P Dow Jones Indices said on Wednesday, sending its shares higher in aftermarket trade.

Lennox will replace biotechnology firm Catalent (NYSE: CTLT ) after Novo Holdings completed its acquisition of the firm this week. The move will be effective from December 23.

Lennox shares rose about 3% after the announcement. The stock is currently part of the S&P Midcap 400 , and will be replaced in the index by financial software maker Bill Com Holdings Inc (NYSE: BILL ).

Bill surged over 6% in aftermarket trade following the announcement.

Catalent’s inclusion in the S&P 500 is expected to attract more capital flows into the stock, especially from exchange-traded funds as they adjust their holdings to reflect the change.

Lennox is trading up nearly 45% so far in 2024, compared to a 23.8% rise in the S&P 500.

Inclusion in the S&P 500 is based on several key criteria, including having a market capital of at least $18 billion and having positive earnings for at least its most recent quarter.