X0306 4 2015-03-26 0 0001528129 Laredo Petroleum, Inc. LPI 0001162870 WARBURG PINCUS LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001239318 KAYE CHARLES R 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001220638 Landy Joseph P. 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 Common Stock, par value $0.01 per share (''Common Stock'') 87670127 I See Footnotes See Exhibit 99.1; Note 1. See Exhibit 99.1; Note 2. See Exhibit 99.1; Note 3. See Exhibit 99.1 Exhibit List: Exhibit 99.1 - Explanation of Responses Exhibit 99.2 - Joint Filer Information WARBURG PINCUS LLC By: Robert B. Knauss, Managing Director 2015-03-26 CHARLES R. KAYE By: Robert B. Knauss, Attorney-in-Fact for Charles R. Kaye 2015-03-26 JOSEPH P. LANDY By: Robert B. Knauss, Attorney-in-Fact for Joseph P. Landy 2015-03-26