Filed Pursuant to Rule 424(b)(3)
Registration No. 333-123677
Prospectus Supplement No. 4 dated March 21, 2006
(To Prospectus dated June 2, 2005)

NRG Energy, Inc.
420,000 Shares of 4% Convertible Perpetual Preferred Stock
10,500,000 Shares of Common Stock issuable upon conversion of the Preferred Stock
      This Prospectus Supplement supplements the prospectus dated June 2, 2005 (the “Prospectus”) of NRG Energy, Inc., relating to the sale by certain of our stockholders (including their pledgees, donees, assignees, transferees, successors and others who later hold any of the selling stockholders’ interests) of up to 420,000 shares of preferred stock, or 10,500,000 shares of our common stock issuable upon conversion of the preferred stock. You should read this Prospectus Supplement in conjunction with the Prospectus, and this Prospectus Supplement is qualified by reference to the Prospectus, except to the extent that the information in this Prospectus Supplement supersedes the information contained in the Prospectus.
      Investing in our preferred stock or common stock involves risks that are described in the “Risk Factors” section beginning on page 6 of the Prospectus.
      Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this Prospectus Supplement is truthful or complete. Any representation to the contrary is a criminal offense.
The date of this Prospectus Supplement is March 21, 2006

 
The table of selling stockholders contained in the Prospectus is hereby superseded by the following table.
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	 	 	 	 	 	 	 	Securities Offered by the	 	 	 	 	 	 	
 	 	Ownership Before Offering	 	Prospectus (1)	 	 	Ownership After Offering (2)	
Name	 	Preferred	 	 	Common (3)	 	Preferred	 	 	Commons (3)	 	 	Preferred	 	 	Common	 	 	% of Common (4)	
1976 Distribution Trust FBO A.R. Lauder/Zinterhofer	 	 	6	 	 	150	 	 	6	 	 	 	150	 	 	 	0	 	 	 	0	 	 	*	
2000 Revocable Trust FBO A.R. Lauder/Zinterhofer	 	 	5	 	 	125	 	 	5	 	 	 	125	 	 	 	0	 	 	 	0	 	 	*	
Advent Claymore Enhance Growth & Income Fund	 	 	2,435	 	 	60,875	 	 	2,435	 	 	 	60,875	 	 	 	0	 	 	 	0	 	 	*	
Advent Convertible Master (Cayman), L.P.	 	 	6,723	 	 	168,075	 	 	6,723	 	 	 	168,075	 	 	 	0	 	 	 	0	 	 	*	
Alcon Laboratories	 	 	641	 	 	16,025	 	 	641	 	 	 	16,025	 	 	 	0	 	 	 	0	 	 	*	
AM International EMAC 63 Ltd.	 	 	790	 	 	19,750	 	 	790	 	 	 	19,750	 	 	 	0	 	 	 	0	 	 	*	
AM Master Fund I, LP	 	 	6,916	 	 	172,900	 	 	6,916	 	 	 	172,900	 	 	 	0	 	 	 	0	 	 	*	
Anthony Munk	 	 	607	 	 	15,175	 	 	607	 	 	 	15,175	 	 	 	0	 	 	 	0	 	 	*	
Arlington County Employees Retirement Systems	 	 	1,032	 	 	25,800	 	 	1,032	 	 	 	25,800	 	 	 	0	 	 	 	0	 	 	*	
Asante Health Systems	 	 	205	 	 	5,125	 	 	205	 	 	 	5,125	 	 	 	0	 	 	 	0	 	 	*	
BBT Fund, L.P.	 	 	8,850	 	 	221,250	 	 	8,850	 	 	 	221,250	 	 	 	0	 	 	 	0	 	 	*	
Boston Income Portfolio c/o Eaton Vance Management High Yield Group	 	 	1,255	 	 	31,375	 	 	1,255	 	 	 	31,375	 	 	 	0	 	 	 	0	 	 	*	
Citigroup Global Markets, Inc.(5)	 	 	5,000	 	 	125,000	 	 	5,000	 	 	 	125,000	 	 	 	0	 	 	 	0	 	 	*	
City of New York Fire Dept Pension Fund High Yield(9)	 	 	125	 	 	3,125	 	 	125	 	 	 	3,125	 	 	 	0	 	 	 	0	 	 	*	
City of New York Police Pension Fund High Yield	 	 	275	 	 	6,875	 	 	275	 	 	 	6,875	 	 	 	0	 	 	 	0	 	 	*	
City of New York Teachers Retirement System High Yield(6)	 	 	375	 	 	9,375	 	 	375	 	 	 	9,375	 	 	 	0	 	 	 	0	 	 	*	
City University of New York	 	 	215	 	 	5,375	 	 	215	 	 	 	5,375	 	 	 	0	 	 	 	0	 	 	*	
CNHCA Master Account, LP	 	 	5,500	 	 	137,500	 	 	5,500	 	 	 	137,500	 	 	 	0	 	 	 	0	 	 	*	
Coastal Convertibles Ltd.	 	 	1,500	 	 	37,500	 	 	1,500	 	 	 	37,500	 	 	 	0	 	 	 	0	 	 	*	
Concentrated Alpha Partners LP	 	 	6,750	 	 	168,750	 	 	6,750	 	 	 	168,750	 	 	 	0	 	 	 	0	 	 	*	
DBAG London	 	 	11,000	 	 	275,000	 	 	11,000	 	 	 	275,000	 	 	 	0	 	 	 	0	 	 	*	
Delaware Dividend Income Fund	 	 	1,500	 	 	37,500	 	 	1,500	 	 	 	37,500	 	 	 	0	 	 	 	0	 	 	*	
Delaware Public Employees Retirement Systems	 	 	1,857	 	 	46,425	 	 	1,857	 	 	 	46,425	 	 	 	0	 	 	 	0	 	 	*	
Deutsche Bank Securities Inc.	 	 	1,500	 	 	37,500	 	 	1,500	 	 	 	37,500	 	 	 	0	 	 	 	0	 	 	*	
2

 
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	 	 	 	 	 	 	 	Securities Offered by the	 	 	 	 	 	 	 	
 	 	Ownership Before Offering	 	Prospectus (1)	 	 	Ownership After Offering (2)	 	
Name	 	Preferred	 	 	Common (3)	 	Preferred	 	 	Commons (3)	 	 	Preferred	 	 	Common	 	% of Common (4)	 	
Diversified High Yield Bond Fund c/o Eaton Vance Management High Yield Group	 	 	245	 	 	6,125	 	 	245	 	 	 	6,125	 	 	 	0	 	 	 	0	 	 	*	 	
Drawbridge Convertible I Ltd.	 	 	489	 	 	12,225	 	 	489	 	 	 	12,225	 	 	 	0	 	 	 	0	 	 	*	 	
Drawbridge Convertible II Ltd.	 	 	156	 	 	3,900	 	 	156	 	 	 	3,900	 	 	 	0	 	 	 	0	 	 	*	 	
Drawbridge Global Macro Masterfund Ltd.	 	 	3,310	 	 	82,750	 	 	3,310	 	 	 	82,750	 	 	 	0	 	 	 	0	 	 	*	 	
ELCA Unscreened — High Yield(6)	 	 	275	 	 	6,875	 	 	275	 	 	 	6,875	 	 	 	0	 	 	 	0	 	 	*	 	
FIST Convertible Secs FD	 	 	10,000	 	 	250,000	 	 	10,000	 	 	 	250,000	 	 	 	0	 	 	 	0	 	 	*	 	
Fidelity Financial Trust: Fidelity
Strategic Dividend & Income Fund(7)(8)	 	4,900	 	 	101,635	 	 	3,900	 	 	 	97,500	 	 	 	0	 	 	 	0	 	 	*	 	
Fore Convertible Master Fund, Ltd.	 	 	25,220	 	 	630,500	 	 	25,220	 	 	 	630,500	 	 	 	0	 	 	 	0	 	 	*	 	
Fore Erisa Fund, Ltd.	 	 	2,790	 	 	69,750	 	 	2,790	 	 	 	69,750	 	 	 	0	 	 	 	0	 	 	*	 	
Frontpoint Convertible Arbitrage Fund LP	 	 	5,000	 	 	125,000	 	 	5,000	 	 	 	125,000	 	 	 	0	 	 	 	0	 	 	*	 	
GLG Market Neutral Fund	 	 	22,000	 	 	550,000	 	 	22,000	 	 	 	550,000	 	 	 	0	 	 	 	0	 	 	*	 	
Grace Convertible Arbitrage Fund, Ltd.	 	 	7,000	 	 	175,000	 	 	7,000	 	 	 	175,000	 	 	 	0	 	 	 	0	 	 	*	 	
Grady Hospital	 	 	201	 	 	5,025	 	 	201	 	 	 	5,025	 	 	 	0	 	 	 	0	 	 	*	 	
Guggenheim Portfolio Company VIII (Cayman) Ltd.	 	 	2,511	 	 	62,775	 	 	2,511	 	 	 	62,775	 	 	 	0	 	 	 	0	 	 	*	 	
Guggenheim Portfolio Company XXXI, LLC	 	 	5,000	 	 	125,000	 	 	5,000	 	 	 	125,000	 	 	 	0	 	 	 	0	 	 	*	 	
Hallmark Master Trust High Yield Fund c/o Eaton Vance Management High Yield Group	 	 	70	 	 	1,750	 	 	70	 	 	 	1,750	 	 	 	0	 	 	 	0	 	 	*	 	
HFR CA Opportunity Mgt. Trst.	 	 	340	 	 	8,500	 	 	340	 	 	 	8,500	 	 	 	0	 	 	 	0	 	 	*	 	
HFR CA Select Fund	 	 	750	 	 	18,750	 	 	750	 	 	 	18,750	 	 	 	0	 	 	 	0	 	 	*	 	
HFR RVA Combined Master Trust	 	 	2,000	 	 	50,000	 	 	2,000	 	 	 	50,000	 	 	 	0	 	 	 	0	 	 	*	 	
High Income Portfolio c/o Eaton Vance Management High Yield Group	 	 	865	 	 	21,625	 	 	865	 	 	 	21,625	 	 	 	0	 	 	 	0	 	 	*	 	
IAM National Pension Fund(6)	 	 	175	 	 	4,375	 	 	175	 	 	 	4,375	 	 	 	0	 	 	 	0	 	 	*	 	
Independence Blue Cross	 	 	623	 	 	15,575	 	 	623	 	 	 	15,575	 	 	 	0	 	 	 	0	 	 	*	 	
Industriens Pensionsforsikring(6)	 	 	175	 	 	4,375	 	 	175	 	 	 	4,375	 	 	 	0	 	 	 	0	 	 	*	 	
3

 
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	 	 	 	 	 	 	 	Securities Offered by the	 	 	 	 	 	 	 	 	
 	 	Ownership Before Offering	 	Prospectus (1)	 	 	Ownership After Offering (2)	 	 	
Name	 	Preferred	 	 	Common (3)	 	Preferred	 	 	Commons (3)	 	 	Preferred	 	 	Common	 	% of Common (4)	 	 	
ING Convertible Fund	 	 	1,920	 	 	48,000	 	 	1,920	 	 	 	48,000	 	 	 	0	 	 	 	0	 	*	 	 	 	
ING CP Convertible Portfolio	 	 	80	 	 	2,000	 	 	80	 	 	 	2000	 	 	 	0	 	 	 	0	 	*	 	 	 	
ING MFS Utilities Portfolio	 	 	40	 	 	79,520	 	 	40	 	 	 	1,000	 	 	 	0	 	 	 	78,520	 	*	 	 	 	
ING T. RowePrice Capital Appreciation Portfolio(6)	 	 	12,000	 	 	300,000	 	 	12,000	 	 	 	300,000	 	 	 	0	 	 	 	0	 	*	 	 	 	
Institutional Benchmarks Master Fund, Ltd.	 	 	1,500	 	 	37,500	 	 	1,500	 	 	 	37,500	 	 	 	0	 	 	 	0	 	*	 	 	 	
Intl Union of Operating Engineers (ENG) c/o Eaton Vance Management High Yield Group	 	 	15	 	 	375	 	 	15	 	 	 	375	 	 	 	0	 	 	 	0	 	*	 	 	 	
JHVST MidCap Value B	 	 	200	 	 	52,200	 	 	200	 	 	 	5,000	 	 	 	0	 	 	 	47,200	 	*	 	 	 	
JMG Capital Partners, Inc	 	 	34,500	 	 	862,500	 	 	34,500	 	 	 	862,500	 	 	 	0	 	 	 	0	 	*	 	 	 	
JMG Triton Offshore Ltd.	 	 	2,850	 	 	71,250	 	 	2,850	 	 	 	71,250	 	 	 	0	 	 	 	0	 	*	 	 	 	
John Hancock Funds II — Spectrum Income Fund(6)	 	 	100	 	 	2,500	 	 	100	 	 	 	2,500	 	 	 	0	 	 	 	0	 	*	 	 	 	
John Hancock Trust — Spectrum Income Trust(6)	 	 	100	 	 	2,500	 	 	100	 	 	 	2,500	 	 	 	0	 	 	 	0	 	*	 	 	 	
John Hancock Trust Utilities Trust	 	 	100	 	 	133,640	 	 	100	 	 	 	2,500	 	 	 	0	 	 	 	131,140	 	*	 	 	 	
John Hancock Variable Series Trust I — Mid Cap Value(6)	 	 	200	 	 	31,800	 	 	200	 	 	 	5,000	 	 	 	0	 	 	 	26,800	 	*	 	 	 	
JP Morgan Securities, Inc.	 	 	2,500	 	 	62,500	 	 	2,500	 	 	 	62,500	 	 	 	0	 	 	 	0	 	*	 	 	 	
Kamunting Street Master Fund, Ltd.	 	 	22,500	 	 	562,500	 	 	22,500	 	 	 	562,500	 	 	 	0	 	 	 	0	 	*	 	 	 	
KBC Financial Products USA, Inc.	 	 	8,955	 	 	223,875	 	 	8,955	 	 	 	223,875	 	 	 	0	 	 	 	0	 	*	 	 	 	
KDC Convertible Arbitrage Fund LP	 	 	3,000	 	 	75,000	 	 	3,000	 	 	 	75,000	 	 	 	0	 	 	 	0	 	*	 	 	 	
Laborers District Council & Contractors Pension FD of Ohio(6)	 	 	200	 	 	19,400	 	 	200	 	 	 	5,000	 	 	 	0	 	 	 	14,400	 	*	 	 	 	
LIJ Invest — Global High Yield	 	 	275	 	 	6,875	 	 	275	 	 	 	6,875	 	 	 	0	 	 	 	0	 	*	 	 	 	
Lyxor	 	 	465	 	 	11,625	 	 	465	 	 	 	11,625	 	 	 	0	 	 	 	0	 	*	 	 	 	
Lyxor/AM Investment Fund Ltd.	 	 	988	 	 	24,700	 	 	988	 	 	 	24,700	 	 	 	0	 	 	 	0	 	*	 	 	 	
Lyxor/Silverado Fund LTD	 	 	1,550	 	 	38,750	 	 	1,550	 	 	 	38,750	 	 	 	0	 	 	 	0	 	*	 	 	 	
Man Mac I, Ltd.	 	 	9,390	 	 	234,750	 	 	9,390	 	 	 	234,750	 	 	 	0	 	 	 	0	 	*	 	 	 	
McMahan Securities Co. LP	 	 	45	 	 	1,125	 	 	45	 	 	 	1,125	 	 	 	0	 	 	 	0	 	*	 	 	 	
4

 
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	 	 	 	 	 	 	 	Securities Offered by the	 	 	 	 	 	 	 	 	
 	 	Ownership Before Offering	 	Prospectus (1)	 	 	Ownership After Offering (2)	 	
Name	 	Preferred	 	 	Common (3)	 	Preferred	 	 	Commons (3)	 	 	Preferred	 	 	Common	 	 	% of Common (4)	 	
MFS Utilities Fund, a Series of MFS Series Trust VI	 	 	1,355	 	 	1,614,875	 	 	1,355	 	 	 	33,875	 	 	 	0	 	 	 	1,581,000	 	 	 	1.15%	 	
MFS Variable Insurance Trust -	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
MFS Utilities Series	 	 	820	 	 	874,400	 	 	820	 	 	 	20,500	 	 	 	0	 	 	 	853,900	 	 	 	*	 	
MFS/Sun Life Series Trust:	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
Utilities Series	 	 	324	 	 	363,800	 	 	324	 	 	 	8,100	 	 	 	0	 	 	 	355,700	 	 	 	*	 	
MSS Convertible Arbitrage 1	 	 	20	 	 	500	 	 	20	 	 	 	500	 	 	 	0	 	 	 	0	 	 	 	*	 	
National Bank of Canada	 	 	1,186	 	 	29,650	 	 	1,186	 	 	 	29,650	 	 	 	0	 	 	 	0	 	 	 	*	 	
New Orleans Firefighters Pension/Relief Fund	 	 	126	 	 	3,150	 	 	126	 	 	 	3,150	 	 	 	0	 	 	 	0	 	 	 	*	 	
New York City Employees Retirement Systems Enhanced Fund(6)	 	 	475	 	 	11,875	 	 	475	 	 	 	11,875	 	 	 	0	 	 	 	0	 	 	 	*	 	
Newport Alternative Income Fund	 	 	2,972	 	 	74,300	 	 	2,972	 	 	 	74,300	 	 	 	0	 	 	 	0	 	 	 	*	 	
NMS Services (Cayman) Inc.	 	 	1,011	 	 	25,275	 	 	1,011	 	 	 	25,275	 	 	 	0	 	 	 	0	 	 	 	*	 	
Northern Income Equity Fund	 	 	2,460	 	 	61,500	 	 	2,460	 	 	 	61,500	 	 	 	0	 	 	 	0	 	 	 	*	 	
Occidental Petroleum Corporation	 	 	114	 	 	2,850	 	 	114	 	 	 	2,850	 	 	 	0	 	 	 	0	 	 	 	*	 	
Pebble Limited Partnership	 	 	2,083	 	 	52,075	 	 	2,083	 	 	 	52,075	 	 	 	0	 	 	 	0	 	 	 	*	 	
Penn Series Flexibly Managed Fund	 	 	5,600	 	 	140,000	 	 	5,600	 	 	 	140,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
Penn Series High Yield Bond Fund	 	 	200	 	 	5,000	 	 	200	 	 	 	5,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
PensionsInvest — Global High Yield(6)	 	250	 	 	6,250	 	 	250	 	 	 	6,250	 	 	 	0	 	 	 	0	 	 	 	*	 	
PFA Invest — Global High Yield(6)	 	 	450	 	 	11,250	 	 	450	 	 	 	11,250	 	 	 	0	 	 	 	0	 	 	 	*	 	
PIMCO Convertible Fund	 	 	500	 	 	12,500	 	 	500	 	 	 	12,500	 	 	 	0	 	 	 	0	 	 	 	*	 	
Policeman and Fireman Retirement System of the City of Detroit	 	 	500	 	 	12,500	 	 	500	 	 	 	12,500	 	 	 	0	 	 	 	0	 	 	 	*	 	
Pro-Mutual	 	 	1,357	 	 	33,925	 	 	1,357	 	 	 	33,925	 	 	 	0	 	 	 	0	 	 	 	*	 	
RWDSU Local 338 High Yield Fund c/o Eaton Vance Management High Yield Fund	 	 	20	 	 	500	 	 	20	 	 	 	500	 	 	 	0	 	 	 	0	 	 	 	*	 	
S.A.C. Arbitrage Fund, LLC	 	 	8,000	 	 	200,000	 	 	8,000	 	 	 	200,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
Sage Capital Management LLC	 	 	3,000	 	 	75,000	 	 	3,000	 	 	 	75,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
Salomon Brothers Asset Management, Inc.(9)	 	 	6,600	 	 	165,000	 	 	6,600	 	 	 	165,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
SEPTA High Yield Fund c/o Eaton Vance Management High Yield Group	 	 	20	 	 	500	 	 	20	 	 	 	500	 	 	 	0	 	 	 	0	 	 	 	*	 	
5

 
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	 	 	 	 	 	 	 	Securities Offered by the	 	 	 	 	 	 	 	 	
 	 	Ownership Before Offering	 	Prospectus (1)	 	 	Ownership After Offering (2)	 	
Name	 	Preferred	 	 	Common (3)	 	Preferred	 	 	Commons (3)	 	 	Preferred	 	 	Common	 	 	% of Common (4)	 	
Severn River Master Fund c/o Morgan Stanley	 	 	1,000	 	 	25,000	 	 	1,000	 	 	 	25,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
Silver Point Capital Fund LP	 	 	1,365	 	 	1,042,333	 	 	1,365	 	 	 	34,125	 	 	 	0	 	 	 	1,008,208	 	 	 	*	 	
Silver Point Capital Offhsore Fund, Ltd.	 	 	2,135	 	 	1,654,740	 	 	2,135	 	 	 	53,375	 	 	 	0	 	 	 	1,601,365	 	 	 	1.17%	 	
Silverado Arbitrage Trading, Ltd.	 	 	500	 	 	22,500	 	 	500	 	 	 	12,500	 	 	 	0	 	 	 	10,000	 	 	 	*	 	
SOCS Ltd.	 	 	10,000	 	 	260,000	 	 	8,000	 	 	 	250,000	 	 	 	2,000	 	 	 	10,000	 	 	 	*	 	
Sphinx Fund	 	 	140	 	 	3,500	 	 	140	 	 	 	3,500	 	 	 	0	 	 	 	0	 	 	 	*	 	
SRI Fund, L.P.	 	 	1,500	 	 	37,500	 	 	1,500	 	 	 	37,500	 	 	 	0	 	 	 	0	 	 	 	*	 	
Stanfield Offshore Leveraged Assets, Ltd.	 	 	10,500	 	 	693,213	 	 	10,500	 	 	 	262,500	 	 	 	0	 	 	 	430,713	 	 	 	*	 	
T. RowePrice Capital Appreciation Fund(6)	 	 	33,600	 	 	840,000	 	 	33,600	 	 	 	840,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
T. RowePrice High Yield Fund(6)	 	 	4,350	 	 	108,750	 	 	4,350	 	 	 	108,750	 	 	 	0	 	 	 	0	 	 	 	*	 	
T. RowePrice Mid-Cap Value Fund(6)	 	 	12,000	 	 	1,132,500	 	 	12,000	 	 	 	300,000	 	 	 	0	 	 	 	832,500	 	 	 	*	 	
The New America High Income Fund	 	 	375	 	 	9,375	 	 	375	 	 	 	9,375	 	 	 	0	 	 	 	0	 	 	 	*	 	
TQA Master Fund, LTD.	 	 	870	 	 	21,750	 	 	870	 	 	 	21,750	 	 	 	0	 	 	 	0	 	 	 	*	 	
TQA Masters Plus Fund, LTD.	 	 	1,510	 	 	37,750	 	 	1,510	 	 	 	37,750	 	 	 	0	 	 	 	0	 	 	 	*	 	
TRP Institutional High Yield Fund	 	 	375	 	 	9,375	 	 	375	 	 	 	9,375	 	 	 	0	 	 	 	0	 	 	 	*	 	
TRP Invest — Global High Yield(6)	 	 	1,200	 	 	51,250	 	 	350	 	 	 	30,000	 	 	 	850	 	 	 	21,250	 	 	 	*	 	
TRP SICAV Global High Yield Bond Fund	 	 	1,125	 	 	28,125	 	 	1,125	 	 	 	28,125	 	 	 	0	 	 	 	0	 	 	 	*	 	
Trustmark Insurance	 	 	393	 	 	9,825	 	 	393	 	 	 	9,825	 	 	 	0	 	 	 	0	 	 	 	*	 	
UBS AG London F/B/O HFS	 	 	5,000	 	 	125,000	 	 	5,000	 	 	 	125,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
UBS AG London FBO PFEL	 	 	18,500	 	 	462,500	 	 	18,500	 	 	 	462,500	 	 	 	0	 	 	 	0	 	 	 	*	 	
UBS AG london FBO WCBP	 	 	20,000	 	 	500,000	 	 	20,000	 	 	 	500,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
UBS O’Connor LLC F/B/O O’Connor Global Convertiable Arbitrage Master Ltd.	 	 	5,000	 	 	125,000	 	 	5,000	 	 	 	125,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
Volkswagen High Yield Bond Fund c/o Eaton Vance Management High Yield Group	 	 	10	 	 	250	 	 	10	 	 	 	250	 	 	 	0	 	 	 	0	 	 	 	*	 	
Whitebox Convertible Arbitrage Partners LP	 	 	26,000	 	 	650,000	 	 	26,000	 	 	 	650,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
Whitebox Diversified Convertible Arbitrage Partners LP	 	 	5,000	 	 	125,000	 	 	5,000	 	 	 	125,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
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 	 	 	 	 	 	 	 	Securities Offered by the	 	 	 	 	 	 	 	 	
 	 	Ownership Before Offering	 	Prospectus (1)	 	 	Ownership After Offering (2)	 	
Name	 	Preferred	 	 	Common (3)	 	Preferred	 	 	Commons (3)	 	 	Preferred	 	 	Common	 	 	% of Common (4)	 	
Xavex – Convertible Arbitrage 7 Fund	 	 	150	 	 	3,750	 	 	150	 	 	 	3,750	 	 	 	0	 	 	 	0	 	 	 	*	 	
Zazove Convertible Arbitrage Fund, LP	 	 	4,000	 	 	100,000	 	 	4,000	 	 	 	100,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
Zazove Hedged Convertible Fund, LP	 	 	2,000	 	 	50,000	 	 	2,000	 	 	 	50,000	 	 	 	0	 	 	 	0	 	 	 	*	 	
Zurich Institutional Benchmarks Master Fund LTD c/o TQA Investors, LLC	 	 	180	 	 	4,500	 	 	180	 	 	 	4,500	 	 	 	0	 	 	 	0	 	 	 	*	 	
Zurich Institutional Benchmarks Master Fund Ltd. c/o Forest Investment LLC	 	 	2,061	 	 	51,525	 	 	2,061	 	 	 	51,525	 	 	 	0	 	 	 	0	 	 	 	*	 	
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*	Less than 1%.	

(1) 	Amounts indicated may be in excess of the total amount registered due to sales or transfers exempt from the registration requirements of the Securities Act of 1933, as amended, since the date upon which the selling stockholders provided to us the information regarding their preferred stock.	
 	 	
(2) 	The information regarding the beneficial ownership after resale of shares is based on the assumption that each selling stockholder will sell all of the shares of preferred stock and common stock owned by the selling stockholder and covered by the Prospectus.	
 	 	
(3) 	Unless otherwise indicated, includes all shares of common stock issuable upon conversion of the preferred stock and assumes a conversion price of $40.00 per share, which is equal to an approximate conversion rate of 25 shares per share of preferred stock. However, this conversion price will be subject to adjustment as described under “Description of the Preferred Stock — Conversion Rights” in the Prospectus. As a result, the number of shares of common stock beneficially owned prior to this offering and the number of shares of common stock offered hereby may increase or decrease in the future.	
 	 	
(4) 	Based on 136,975,275 shares of common stock outstanding as of March 13, 2006.	
 	 	
(5) 	Citigroup Global Markets Inc. was a co-placement agent on the issuance of the preferred stock.	
 	 	
(6) 	T. Rowe Price Associates, Inc. serves as investment adviser with power to direct investments and/or sole power to vote the shares owned by certain funds and accounts subject this footnote, as well as shares owned by certain other individual and institutional investors. For purposes of reporting requirements of the Securities and Exchange Act of 1934, T. Rowe Price Associates, Inc. may be deemed to be the beneficial owner of all of the shares listed above that are subject to this footnote; however, T. Rowe Price Associates, Inc. expressly disclaims that it is in fact the beneficial owner of such securities. T. Rowe Price Associates, Inc. is the wholly owned subsidiary of T. Rowe Price Group, Inc., which is a publicly traded financial services holding company.	
 	 	
(7) 	The entity is a registered investment fund advised by Fidelity Management & Research Company (“FMR Co.”), a registered investment adviser under the Investment Advisers Act of 1940, as amended. FMR Co., 82 Devonshire Street, Boston, Massachusetts 02190, a wholly-owned subsidiary of FMR Corp. and an investment adviser registered under Section 203 of the Investment Advisers Act of 1940, is the beneficial owner of 2,402,699 shares of our outstanding common stock as a result of acting as investment adviser to various investment companies registered under Section 8 of the Investment Company Act of 1940.	
 	 	
(8) 	Based on information provided by the selling stockholder and, in addition to the preferred stock and common stock covered by this prospectus, includes beneficial ownership of our 5.75% Mandatory Convertible Preferred Stock, as well as the common stock to be issued upon conversion of such preferred stock.	
 	 	
(9) 	Salomon Brothers Asset Management, Inc. acts as discretionary investment advisor with respect to certain accounts that hold the preferred stock. Accordingly, Salomon Brothers Asset Management, Inc. may be deemed to be the beneficial owner of such preferred stock. Salomon Brothers Asset Management, Inc. is the beneficial owner and, therefore, the Selling Stockholder of the following accounts: General Motors Investment Corp. (5,000 shares), General Motors Broad Mandate (600 shares) and Smith Barney Convertible Fund (1,000 shares).	
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