Exhibit 99.3

Designated Filer: Warburg Pincus Private Equity IX, L.P.

Issuer & Ticker Symbol: Laredo Petroleum Holdings, Inc. [LPI]

Date of Event Requiring Statement: November 25, 2013

JOINT FILERS’ SIGNATURES

WARBURG PINCUS IX LLC
By: Warburg Pincus Partners LLC, its Sole Member
By: Warburg Pincus & Co., its Managing Member
By:	/s/ Steven G. Glenn		Date:	November 26, 2013
	Name:	Steven G. Glenn
	Title:	Attorney-in-Fact*
WARBURG PINCUS PARTNERS LLC
By: Warburg Pincus & Co., its Managing Member
By:	/s/ Steven G. Glenn		Date:	November 26, 2013
	Name: Steven G. Glenn
	Title:  Attorney-in-Fact*
WARBURG PINCUS LLC
By:	/s/ Steven G. Glenn		Date:	November 26, 2013
	Name: Steven G. Glenn
	Title:  Managing Director
WARBURG PINCUS & CO.
By:	/s/ Steven G. Glenn		Date:	November 26, 2013
	Name: Steven G. Glenn
	Title: Attorney-in-Fact*
CHARLES R. KAYE
By:	/s/ Steven G. Glenn		Date:	November 26, 2013
By:  Steven G. Glenn, Attorney-in-Fact*
JOSEPH P. LANDY
By:	/s/ Steven G. Glenn		Date:	November 26, 2013
By:  Steven G. Glenn, Attorney-in-Fact*

*The Power of Attorney given by each of Warburg Pincus & Co., Mr. Kaye and Mr. Landy is filed as Exhibit 24.0 hereto.