USG

USG Corporation

(United States Gypsum): A major manufacturer of building materials like drywall and ceiling systems. They have been around over 100 years.USG Corporation, also known as United States Gypsum Corporation, is an American company which manufactures construction materials, most notably drywall and joint compound. The company is the largest distributor of wallboard in the United States and the largest manufacturer of gypsum products in North America. It is also a major consumer of synthetic gypsum, a byproduct of flue-gas desulfurization. Its corporate offices are located at 550 West Adams Street in Chicago, Illinois.

USG's most significant brands include Sheetrock Brand Gypsum Panels, Securock Brand Glass-Mat Sheathing, and Sheetrock Brand All Purpose Joint Compound.

In December 2013, Warren Buffett's Berkshire Hathaway became the largest shareholder in the company (holding roughly 30%) when it converted USG convertible notes it had acquired in 2008 to common stock.