Robbins Geller Rudman & Dowd LLP (“Robbins Geller”) ( http://www.rgrdlaw.com/cases/ypf/) today announced that a class action has been commenced on behalf of an institutional investor in the United States District Court for the Southern District of New York on behalf of all persons or entities who purchased the American Depositary Shares (“ADSs”) of YPF Sociedad Anonima (“YPF” or the “Company”) (NYSE:YPF) pursuant and/or traceable to the Company’s March 23, 2011 offering (the “Offering”) seeking to pursue remedies under the Securities Act of 1933 (the “Securities Act”). If you wish to serve as lead plaintiff, you must move the Court no later than 60 days from today. If you wish to discuss this action or have any questions concerning this notice or your rights or interests, please contact plaintiff’s counsel, Samuel H. Rudman or David A. Rosenfeld of Robbins Geller at 800/449-4900 or 619/231-1058, or via e-mail at email@example.com. If you are a member of this class, you can view a copy of the complaint as filed or join this class action online at http://www.rgrdlaw.com/cases/ypf/. Any member of the putative class may move the Court to serve as lead plaintiff through counsel of their choice, or may choose to do nothing and remain an absent class member. The complaint charges YPF, certain of its officers and directors and the underwriters of the Offering with violations of the Securities Act. YPF describes itself as “Argentina’s leading energy company, operating a fully integrated oil and gas chain with leading market positions” in the exploration, development and production of crude oil, natural gas and liquefied petroleum gas, and the refining, marketing, transportation and distribution of energy based products. On or about November 26, 2010, YPF filed a Form F-3 Registration Statement (the “Registration Statement”) for the Offering with the SEC. On or about March 23, 2011, the Prospectus with respect to the Offering, which forms part of the Registration Statement, became effective and more than 26.2 million shares of YPF ADSs were sold to the public at $41 per share, thereby valuing the total size of the Offering at more than $1 billion.