X0306 4 2015-03-26 1 0001528129 Laredo Petroleum, Inc. LPI 0001635315 Warburg Pincus Private Equity (E&P) X, Inc. 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001635310 Warburg Pincus Private Equity (E&P) X - A, L.P. 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001635322 Warburg Pincus Private Equity (E&P) X - B, L.P. 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001635325 Warburg Pincus (E&P) X, L.P. 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001635318 Warburg Pincus (E&P) X LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001635319 Warburg Pincus Partners (E&P) LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0001635320 Warburg Pincus & Co US, LLC 450 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 Common Stock, par value $0.01 per share (''Common Stock'') 2015-03-26 4 S 0 4847321 11.05 D 0 D Common Stock 2015-03-26 4 S 0 6900452 11.05 D 0 D Common Stock 2015-03-26 4 J 0 11747773 11.05 D 0 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; Note 4. See Exhibit 99.1 Exhibit List: Exhibit 99.1 - Explanation of Responses Exhibit 99.2 - Joint Filer Information Exhibit 99.3 - Joint Filers' Signatures By: /s/ Steven G. Glenn 2015-03-26