WuXi AppTec has recently come under fire from U.S. politicians who want to ban government-backed projects from buying its services, causing the stock to lose about half of its value this year.

FAST NEWS: BlackRock boosts stake in battered WuXi AppTec

The latest: Asset management company BlackRock Inc. purchased 618,000 Hong Kong-listed shares of WuXi AppTec Co. Ltd. (2359.HK; 603259.SH) on March 26, raising its stake in the drug outsourcing services company from…