- 25 - Exhibit (11) OWENS CORNING AND SUBSIDIARIES COMPUTATION OF PER SHARE EARNINGS Quarter Nine Months Ended Ended September 30, September 30, 1997 1996 1997 1996 (In millions of dollars, except share data) Primary: Net income (loss) $ 59 $ 80 $ 164 $(354) Weighted average number of shares outstanding (thousands) 53,387 51,782 53,107 51,616 Weighted average common equivalent shares (thousands): Deferred awards 14 15 14 - Stock options using weighted average market price 538 577 589 - Primary weighted average number of common shares outstanding and common equivalent shares (thousands) 53,939 52,374 53,710 51,616 Primary per share amount $ 1.09 $ 1.53 $ 3.05 $ (6.86) Fully Diluted: Net income (loss) $ 61 $ 82 $ 170 $ (354) Weighted average number of shares outstanding (thousands) 53,387 51,782 53,107 51,616 Weighted average common equivalent shares (thousands): Deferred awards 14 15 14 - Stock options using the higher of average market price or market price at end of period 538 615 625 - Shares from assumed conversion of preferred securities 4,566 4,566 4,566 - Fully diluted weighted average number of common shares outstanding and common equivalent shares (thousands) 58,505 56,978 58,312 51,616 Fully diluted per share amount $ 1.04 $ 1.44 $ 2.91 $ (6.86)