U.S. corporations are set to report their most profitable fourth quarter on record as companies from Apple Inc. to Dow Chemical Co. feed the demand for iPads, caustic soda and capital goods that’s bolstering the economy.

Earnings per share for all Standard & Poor’s 500 Index companies are expected to have risen about 20 percent to $22.05 for the three months ended Dec. 31, according to analysts’ estimates compiled by Bloomberg. Profits excluding the financial industry may have climbed 12 percent, forecasts indicate.