Shares of GrafTech International Ltd. fell 2% in their first few minutes of trading Thursday, after the company priced its initial public offering at $15, well below its $21 to $24 price range. The company makes graphite electrode products that are used the manufacture of steel. GrafTech also sold fewer shares than expected in the deal. Shares were last down just 0.5%, while the S&P 500 was down 0.4%.