X0306 4 2015-04-27 0 0000757011 USG CORP USG 0001207297 FERGUSON STANLEY L C/O USG CORPORATION 550 W. ADAMS STREET CHICAGO IL 60661 0 1 0 0 Executive Vice President Common Stock 2015-04-27 4 M 0 20478 14.76 A 162205 D Common Stock 2015-04-27 4 S 0 20478 28.1672 D 141727 D Common Stock 2015-04-27 4 S 0 5000 28.0218 D 136727 D Common Stock 286.947 I By 401(K) Plan Employee Stock Option (right to buy) 14.76 2015-04-27 4 M 0 20478 0 A 2022-02-08 Common Stock 20478 6828 D The per share sale price for the common stock sold in the reported transaction ranged from $28.00 to $28.43. The reporting person will provide upon request by the Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares sold at each separate price. The option vested with respect to the shares included in the reported transaction in three equal annual installments beginning on February 8, 2013. As of the date of this report 6,828 options remain outstanding. The per share sales price for the common stock sold in the reported transaction ranged from $27.95 to $28.26. The reporting person will provide upon request by the Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares sold at each separate price. /s/ Jessica A. Garascia, Attorney-In-Fact 2015-04-29