Designated Filer:	Warburg Pincus Private Equity X O&G, L.P.
Issuer & Ticker Symbol:	Laredo Petroleum Holdings, Inc. [LPI]
Date of Event Requiring Statement:	October 17, 2012

Joint Filer Information

1.	Name:	Warburg Pincus Private Equity X O&G, L.P.
	Address:	C/O WARBURG PINCUS LLC
		450 LEXINGTON AVENUE
		New York, NY 10017
2.	Name:	Warburg Pincus X Partners, L.P.
	Address:	C/O WARBURG PINCUS LLC
		450 LEXINGTON AVENUE
		New York, NY 10017
3.	Name:	Warburg Pincus X, L.P.
	Address:	C/O WARBURG PINCUS LLC
		450 LEXINGTON AVENUE
		New York, NY 10017
4.	Name:	Warburg Pincus X LLC
	Address:	C/O WARBURG PINCUS LLC
		450 LEXINGTON AVENUE
		New York, NY 10017
5.	Name:	Warburg Pincus Partners LLC
	Address:	C/O WARBURG PINCUS LLC
		450 LEXINGTON AVENUE
		New York, NY 10017
6.	Name:	Warburg Pincus LLC
	Address:	450 LEXINGTON AVENUE
		New York, NY 10017
7.	Name:	Warburg Pincus & Co.
	Address:	450 LEXINGTON AVENUE
		New York, NY 10017
8.	Name:	Charles R. Kaye
	Address:	C/O WARBURG PINCUS LLC
		450 LEXINGTON AVENUE
		New York, NY 10017
9.	Name:	Joseph P. Landy
	Address:	C/O WARBURG PINCUS LLC
		450 LEXINGTON AVENUE
		New York, NY 10017