Specialty materials manufacturer Celanese (NYSE: CE) has the attention of Warren Buffett's Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B), which bought shares of the stock beginning in early 2022. It hasn't been a great investment so far for Buffett and Berkshire as the stock is down more than 35% over the last year. Trading on slightly more than 8 times estimated forward earnings and sporting a 2.7% dividend yield, Celanese is, conventionally speaking, a cheap stock.