A deep disconnect between private market valuations of companies and the prices their shares fetch on the open market is pushing more mutual fund managers to the sidelines during high profile IPOs, anticipating the newly listed stocks will inevitably fall.

Several "buy" ratings from SmileDirectClub's IPO banks failed to stop its stock from dropping 5% on Monday, reflecting Wall Street's deepened distaste for money-losing startups in the wake of WeWork's botched attempt to go public.

Germany's Merck KGaA said on Monday it had completed its acquisition of Versum Materials , adding that it expected Versum to contribute around 270 million euros ($296.76 million) to group revenues by the end of the year.

Companies making their debut on the U.S. stock market are getting a rough welcome, especially if they are losing money, casting a shadow over the calendar for initial public offerings for the rest of the year.

Japan's SoftBank Group Corp is seeking the help of its chief operating officer, Marcelo Claure, to turn around WeWork, Bloomberg reported on Friday.

Electronic instruments maker Ametek Inc said on Friday it would buy a unit of Roper Technologies Inc , Gatan Inc, for $925 million in cash, a few months after Thermo Fisher Scientific Inc scrapped its plan to buy the business.

Centene Corp and Wellcare Health Plans Inc have agreed to sell Wellcare's Missouri and Nebraska Medicaid plans for people with low income to Anthem Inc , as the companies look to close their $15.27 billion deal.

Oxford Immunotec Global Plc , a medical diagnostics company that develops tests to identify tuberculosis, is exploring strategic alternatives, including a potential sale, people familiar with the matter said on Monday.

Dutch medical equipment company Koninklijke Philips NV said on Thursday it plans to sell the remaining 10.7% stake it holds in Signify NV , its former lighting division, for about 357 million euros ($394.24 million) or 25.9 euros per share.

Italian billionaire Leonardo Del Vecchio has acquired a stake of 6.94% in Italian investment house Mediobanca , his holding company Delfin said on Tuesday.