Pfizer Inc. (Pfizer) is a research-based, global pharmaceutical company. The Company discovers, develops, manufactures and markets prescription medicines for humans and animals. It operates in two business segments: Pharmaceutical and Animal Health. Pfizer also operates several other businesses, including the manufacture of gelatin capsules, contract manufacturing and bulk pharmaceutical chemicals. In June 2008, Pfizer completed the acquisition of all remaining outstanding shares of common stock of Encysive Pharmaceuticals, Inc. through a merger of Pfizer's wholly owned subsidiary, Explorer Acquisition Corp., with and into Encysive. In June 2008, it also completed the acquisition of Serenex, Inc., a biotechnology company with a Heat Shock Protein 90 development portfolio. In July 2009, Pfizer bought back a 29.52% stake in its Indian arm, Pfizer Limited, increasing its stake to 70.75%.In October 2009, Pfizer Inc. acquired Wyeth.