To: All Persons or Entities who purchased USG Corporation (“USG” or the “Company”) (NYSE: USG) stock prior to June 11, 2018. You are hereby notified that Levi & Korsinsky, LLP has commenced an investigation into the fairness of the USG merger. USG will be sold to Gebr. Knauf KG. Under the terms of the transaction, USG shareholders will receive $44 per share, consisting of $43.50 per share in cash and a $0.50 per share special dividend paid upon shareholder approval of the transaction. To learn more about the USG merger and your rights, go to: http://www.zlk.com/mna/usg-corporation or contact Joseph E. Levi, Esq. either via email at jlevi@levikorsinsky.com or by telephone at (212) 363-7500, toll-free: (877) 363-5972. There is no cost or obligation to you.

The investigation concerns whether the Board of USG breached their fiduciary duties to stockholders by failing to adequately shop the Company before agreeing to enter into this transaction, and whether Gebr. Knauf KG is underpaying for USG shares, thus unlawfully harming USG shareholders. Shareholders representing a combined 31% of the Company’s outstanding shares have already agreed to tender their shares.

Levi & Korsinsky is a national firm with offices in New York, Connecticut, California, and Washington D.C. The firm’s attorneys have extensive expertise in prosecuting securities litigation involving financial fraud, representing investors throughout the nation in securities lawsuits and have recovered hundreds of millions of dollars for aggrieved shareholders. For more information, please feel free to contact any of the attorneys listed below. Attorney advertising. Prior results do not guarantee similar outcomes.