Tenaris S.A. Loss Form

(1) Tenaris’s CEO and Chairman, Paolo Rocca, knew that one of his company’s executives paid cash to government officials from 2009 to 2012 to expedite compensation payments for the sale of Sidor; (2) this conduct would lead to Rocca being charged in a graft scheme, and subject Tenaris, its affiliates, and/or executives to heightened governmental scrutiny; and (3) as a result, Tenaris’s public statements were materially false and/or misleading at all relevant times. When the true details entered the market, the lawsuit claims that investors suffered damages.