According to Reuters, Atotech (ATC) approached by MKS Instruments (MKSI) 

POTENTIAL DEAL DETAILS

Semiconductor equipment maker MKS Instruments Inc (MKSI) has approached Atotech Ltd (ATC), a specialty chemicals group that has a market value of $4.7 billion, with an acquisition offer, people familiar with the matter said.

Update(s):

July 01, 2021: MKS Instruments, Inc. (MKSI), a global provider of technologies that enable advanced processes and improve productivity, and Atotech Limited (ATC), a leading process chemicals technology company and a market leader in advanced electroplating solutions, announced that they have entered into a definitive agreement pursuant to which MKS will acquire Atotech for $16.20 in cash and 0.0552 of a share of MKS common stock for each Atotech common share.

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