The value of the 88-year-old activist investor’s company has fallen by nearly $20 billion. Mr. Icahn said that he was “absolutely not selling.” Icahn, Carl C, Icahn Enterprises L P, Banking and Financial Institutions, Stocks and Bonds, Short Selling, Shareholder Rights and Activism, Hindenburg Research, Securities and Commodities Violations, Securities and Exchange Commission The value of the 88-year-old activist investor’s company has fallen by nearly $20 billion. Mr. Icahn said that he was “absolutely not selling.” NYT > Business