Shares of Thermo Fisher Scientific Inc. TMO slid 1.16% to $533.29 Wednesday, on what proved to be an all-around mixed trading session for the stock market, with the S&P 500 Index SPX rising 0.01% to 5,956.06 and the Dow Jones Industrial Average DJIA falling 0.43% to 43,433.12.

Shares of Solventum jumped Tuesday and led S&P 500 gainers intraday after medical device maker Thermo Fisher Scientific said it would acquire the company’s purification and filtration business for $4.

Thermo Fisher Scientific agreed to pay about $4.1 billion in cash to acquire Solventum’s purification and filtration business. The technologies, used in the production of biologics and medical devices and for industrial applications,