Exhibit 99.3

Designated Filer:	Warburg Pincus Private Equity X O&G, L.P.
Issuer & Ticker Symbol:	Laredo Petroleum, Inc. [LPI]
Date of Event Requiring Statement:	May 12, 2014

Joint Filers’ Signatures

WARBURG PINCUS PRIVATE EQUITY X O&G, L.P.
By:	Warburg Pincus X, L.P., its General Partner
	By:	Warburg Pincus X LLC, its General Partner
		By:		Warburg Pincus Partners LLC, its Sole Member
				By:	Warburg Pincus & Co., its Managing Member
By:	/s/ Robert B. Knauss					Date:	May  12, 2014
	Name:		Robert B. Knauss
	Title:		Partner
WARBURG PINCUS X PARTNERS, L.P.
By:	Warburg Pincus X, L.P., its General Partner
	By:	Warburg Pincus X LLC, its General Partner
		By:		Warburg Pincus Partners LLC, its Sole Member
				By:	Warburg Pincus & Co., its Managing Member
By:	/s/ Robert B. Knauss					Date:	May  12, 2014
	Name:		Robert B. Knauss
	Title:		Partner
WARBURG PINCUS X, L.P.
By:	Warburg Pincus X LLC, its General Partner
	By:	Warburg Pincus Partners LLC, its Sole Member
		By:		Warburg Pincus & Co., its Managing Member
By:	/s/ Robert B. Knauss					Date:	May  12, 2014
	Name:		Robert B. Knauss
	Title:		Partner
WARBURG PINCUS X LLC
By:	Warburg Pincus Partners LLC, its Sole Member
	By:	Warburg Pincus & Co., its Managing Member
By:	/s/ Robert B. Knauss					Date:	May  12, 2014
	Name:		Robert B. Knauss
	Title:		Partner
WARBURG PINCUS PARTNERS LLC
By:	Warburg Pincus & Co., its Managing Member
By:	/s/ Robert B. Knauss					Date:	May  12, 2014
	Name:		Robert B. Knauss
	Title:		Partner

WARBURG PINCUS LLC
By:	/s/ Robert B. Knauss		Date:	May  12, 2014
	Name:	Robert B. Knauss
	Title:	Managing Director
WARBURG PINCUS & CO.
By:	/s/ Robert B. Knauss		Date:	May  12, 2014
	Name:	Robert B. Knauss
	Title:	Partner
CHARLES R. KAYE
By:	/s/ Robert B. Knauss		Date:	May  12, 2014
	Name:	Charles R. Kaye
	By: Robert B. Knauss, Attorney-in-Fact*
JOSEPH P. LANDY
By:	/s/ Robert B. Knauss		Date:	May  12, 2014
	Name:	Joseph P. Landy
	By: Robert B. Knauss, Attorney-in-Fact*

* The Power of Attorney given by each of Mr. Kaye and Mr. Landy was previously filed with the U.S. Securities & Exchange Commission on November 26, 2013 as an exhibit to a statement on Form 4 filed by Warburg Pincus Private Equity IX, L.P. with respect to Laredo Petroleum, Inc. (f/k/a Laredo Petroleum Holdings, Inc.) and is hereby incorporated by reference.