Drug maker Merck

Headquarters: Whitehouse Station, N.J. Employees: 63,382 worldwide as of Oct. 31 Canadian operations: Subsidiary Merck Frosst has its main plant at Kirkland, Que., along with offices in Vancouver, Edmonton, Toronto and Ottawa. Key drugs: Zocor, Vytorin and Zetia for high cholesterol; Fosamax for osteoporosis; Singulair for asthma and seasonal allergies Sources: Merck & Co., IMS Health