EXHIBIT 11 CREDIT SUISSE FIRST BOSTON (USA), INC. AND SUBSIDIARIES (Formerly Donaldson, Lufkin & Jenrette, Inc. and Subsidiaries) Computation of Basic Earnings Per Share (In thousands, except per share amounts) Three Months Ended Nine Months Ended September 30, September 30, 2000 1999 2000 1999 --------- --------- --------- --------- CSFB (USA) COMMON STOCK Weighted Average Common Shares: Average Common Shares Outstanding 129,704 125,835 128,229 125,053 Average Restricted Stock Units Outstanding 158 158 158 158 --------- --------- --------- --------- Weighted Average Common Shares Outstanding 129,862 125,993 128,387 125,211 ========= ========= ========= ========= Earnings: Net Income $ 49,800 $ 122,200 $ 457,200 $ 409,500 Less: Preferred Stock Dividend Requirement 5,289 5,289 15,867 15,867 Earnings (Loss) Applicable to Common Shares-DLJdirect (745) (596) 507 (547) --------- --------- --------- --------- Earnings Applicable to Common Shares $ 45,256 $ 117,507 $ 440,826 $ 394,180 ========= ========= ========= ========= Basic Earnings Per Common Share $ 0.35 $ 0.93 $ 3.43 $ 3.15 ========= ========= ========= ========= DLJdirect COMMON STOCK Weighted Average Common Shares: Average Common Shares Outstanding 18,400 18,400 18,400 18,400 ========= ========= ========= ========= Earnings Applicable to Common Shares $ (745) $ (596) $ 507 $ (547) ========= ========= ========= ========= Basic Earnings Per Common Share $ (0.04) $ (0.03) $ 0.03 $ (0.03) ========= ========= ========= =========