Asahi Kasei Corp., which recently moved its global headquarters for its Healthcare Business to the U.S., has offered to acquire the shares of the pharmaceutical company Calliditas Therapeutics AB to make Calliditas a wholly-owned subsidiary of Asahi Kasei.   The Tender Offer also includes a concurrent offer by Asahi Kasei to acquire all American Depositary Shares (ADS), each representing two shares in Calliditas, which will be conducted pursuant to the securities rules of the United States.  ...