Filed pursuant to Rule 424 (b) (3)

Registration No. 333-125682

4,600,000 Shares

of

Chesapeake Energy Corporation

5.00% Cumulative Convertible Preferred Stock (Series 2005)

(Liquidation Preference $100 per share)

and

Common Stock,

(Par Value $.01 per share)

PROSPECTUS SUPPLEMENT NO. 6

DATED June 5, 2006

TO PROSPECTUS DATED June 27, 2005

 

The selling securityholders table on pages 36 through 38 of the prospectus is amended by this supplement no. 6 to read as follows.

 

 

 

 

 

 

 

NAME

 

Number of Shares of Preferred Stock Beneficially Owned Prior to the Offering

 

Number of Shares of Preferred Stock Being Offered Hereby

 

Number of Shares of Preferred Stock to be Owned After Completion of the Offering

 

Number of Shares of Common Stock Beneficially Owned Prior to the Offering *

 

Number of Shares of Common Stock Being Offered Hereby *

 

Number of Shares of Common Stock to be Owned After Completion of the Offering

1976 Distribution Trust
f/b/o A. R. Lauder/Zinterhoser

 

50

 

50

 

0

 

194

 

194

 

0

2000 Revocable Trust f/b/o Lauder/Zinterhoser

 

48

 

48

 

0

 

186

 

186

 

0

Advent Convertible Master Cayman

 

96,858

 

96,858

 

0

 

375,916

 

375,916

 

0

Alcon Laboratories

 

3,184

 

3,184

 

0

 

12,357

 

12,357

 

0

Allstate Insurance Company

 

38,500

 

38,500

 

0

 

149,422

 

149,422

 

0

Argent Classic Convertible Arbitrage Fund (Bermuda) Ltd.

 

165,100

 

165,100

 

0

 

640,770

 

640,770

 

0

Argent Classic Convertible Arbitrage Fund II, L.P.

 

3,220

 

3,220

 

0

 

12,497

 

12,497

 

0

Argent Classic Convertible Arbitrage Fund, L.P.

 

50,000

 

50,000

 

0

 

194,055

 

194,055

 

0

Argent LowLev Convertible Arbitrage Fund II, LLC

 

1,250

 

1,250

 

0

 

4,851

 

4,851

 

0

Argent LowLev Convertible Arbitrage Fund LLC

 

18,370

 

18,370

 

0

 

71,296

 

71,296

 

0

Arlington County Employees Retirement Systems

 

5,137

 

5,137

 

0

 

19,937

 

19,937

 

0

Argent LowLev Convertible Arbitrage Fund Ltd.

 

149,280

 

149,280

 

0

 

579,371

 

579,371

 

0

Argentum Multistrategy Fund Ltd - Classic

 

810

 

810

 

0

 

3,144

 

3,144

 

0

 

 

 

 

Asante Health Systems

 

557

 

557

 

0

 

2,162

 

2,162

 

0

Bancroft Convertible Fund, Inc.

 

30,000

 

30,000

 

0

 

116,433

 

116,433

 

0

Bill & Melinda Gates Foundation

 

7,500

 

7,500

 

0

 

29,108

 

29,108

 

0

BP Amoco PLC Master Trust

 

8,480

 

8,480

 

0

 

32,912

 

32,912

 

0

British Virgin Islands Social Security Board

 

950

 

950

 

0

 

3,687

 

3,687

 

0

Calamos Convertible and High Income Fund

 

102,700

 

102,700

 

0

 

398,589

 

398,589

 

0

Calamos Convertible Opportunities and Income Fund

 

91,100

 

91,100

 

0

 

353,568

 

353,568

 

0

Calamos Growth & Income Fund
- Calamos Investment Trust

 

200,000

 

200,000

 

0

 

776,220

 

776,220

 

0

Calamos Growth & Income Portfolio
- Calamos Advisors Trust

 

500

 

500

 

0

 

1,941

 

1,941

 

0

Calamos High Yield Fund
- Calamos Investment Trust

 

20,000

 

20,000

 

0

 

77,622

 

77,622

 

0

Calamos Strategic Total Return Fund

 

210,700

 

210,700

 

0

 

817,748

 

817,748

 

0

Castle Convertible Fund (1)

 

10,000

 

10,000

 

0

 

834,727

 

38,811

 

795,916

CBI Pension Plan

 

300

 

300

 

0

 

1,164

 

1,164

 

0

City and County of San Francisco Retirement System

 

11,415

 

11,415

 

0

 

44,303

 

44,303

 

0

City University of New York

 

1,067

 

1,067

 

0

 

4,141

 

4,141

 

0

Class C Trading Company, Ltd.

 

2,040

 

2,040

 

0

 

7,917

 

7,917

 

0

Context Convertible Arbitrage Fund, LP

 

3,200

 

3,200

 

0

 

12,420

 

12,420

 

0

Context Convertible Arbitrage Offshore, Ltd

 

12,350

 

12,350

 

0

 

47,932

 

47,932

 

0

Daimler Chrysler Corp
Emp #1 Pension Plan, dtd 4/1/89

 

47,200

 

47,200

 

0

 

183,188

 

183,188

 

0

DBAG London (1)

 

215,205

 

215,205

 

0

 

885,679

 

835,232

 

50,447

Delaware Dividend Income Fund, a series of Delaware Group Equity Funds V (1)

 

35,000

 

35,000

 

0

 

170,458

 

135,839

 

34,619

Delaware Employees Retirement System

 

9,309

 

9,309

 

0

 

36,129

 

36,129

 

0

Deutsche Bank Securities (1)

 

2,500

 

2,500

 

0

 

2,667,266

 

9,703

 

2,657,563

Dreyfus Premier High Income Fund

 

10,000

 

10,000

 

0

 

38,811

 

38,811

 

0

Dynamic World Convertible Debentures Fund

 

15,000

 

15,000

 

0

 

58,217

 

58,217

 

0

Ellsworth Convertible Growth and Income Fund, Inc.

 

30,000

 

30,000

 

0

 

116,433

 

116,433

 

0

Employees Retirement System of Rhode Island

 

2,500

 

2,500

 

0

 

9,703

 

9,703

 

0

Evangelical Lutheran Church in America
Board of Pensions

 

7,500

 

7,500

 

0

 

29,108

 

29,108

 

0

Fairfax County Employees Retirement System

 

1,500

 

1,500

 

0

 

5,822

 

5,822

 

0

Fidelity Financial Trust:
Fidelity Convertible Securities Fund

 

85,000

 

85,000

 

0

 

329,894

 

329,894

 

0

Finch Tactical Plus Class B

 

1,100

 

1,100

 

0

 

4,269

 

4,269

 

0

FIST Convertible Securities Fund

 

120,000

 

120,000

 

0

 

465,732

 

465,732

 

0

FPL Group Employee Pension Fund

 

7,000

 

7,000

 

0

 

27,168

 

27,168

 

0

Franklin and Marshall College

 

2,700

 

2,700

 

0

 

10,479

 

10,479

 

0

Franklin Income Fund

 

1,800,000

 

1,800,000

 

0

 

6,985,980

 

6,985,980

 

0

FTIF Franklin Income Fund

 

80,000

 

80,000

 

0

 

310,488

 

310,488

 

0

FTVIP Franklin Income Securities Fund

 

250,000

 

250,000

 

0

 

970,275

 

970,275

 

0

General Motors Broad Mandate

 

6,300

 

6,300

 

0

 

24,451

 

24,451

 

0

General Motors Investment Corp

 

50,000

 

50,000

 

0

 

194,055

 

194,055

 

0

Government of Singapore Investment Corporation Pte Ltd (1)

 

40,000

 

40,000

 

0

 

1,528,504

 

155,244

 

1,373,260

GMAM Investment Funds Trust

 

20,000

 

20,000

 

0

 

77,622

 

77,622

 

0

Grady Hospital Foundation

 

1,003

 

1,003

 

0

 

3,893

 

3,893

 

0

Harbor High-Yield Bond Fund

 

2,000

 

2,000

 

0

 

7,762

 

7,762

 

0

HFR CA Global Select Master Trust Account

 

20,020

 

20,020

 

0

 

77,700

 

77,700

 

0

HFR Opportunity Master Trust

 

8,489

 

8,489

 

0

 

32,947

 

32,947

 

0

Honeywell International Inc. Master Retirement Trust

 

10,000

 

10,000

 

0

 

38,811

 

38,811

 

0

Hotel Union & Hotel Industry of Hawaii Pension Plan Master Trust

 

1,308

 

1,308

 

0

 

5,076

 

5,076

 

0

2

 

Houston Police Officers Pension System

 

2,500

 

2,500

 

0

 

9,703

 

9,703

 

0

Independence Blue Cross

 

2,766

 

2,766

 

0

 

10,735

 

10,735

 

0

ING Convertible Fund

 

35,000

 

35,000

 

0

 

135,839

 

135,839

 

0

ING Convertible Portfolio

 

2,000

 

2,000

 

0

 

7,762

 

7,762

 

0

Institutional Benchmark Management Fund
c/o Quattro Fund

 

1,500

 

1,500

 

0

 

5,822

 

5,822

 

0

International Truck & Engine Corporation
Retiree Health Benefit Trust (1)

 

900

 

900

 

0

 

21,510

 

3,493

 

18,017

Janus High Yield

 

10,600

 

10,600

 

0

 

41,140

 

41,140

 

0

Janus World High Yield Fund

 

19,600

 

19,600

 

0

 

76,070

 

76,070

 

0

Jefferies & Company

 

11,800

 

11,800

 

0

 

45,797

 

45,797

 

0

Lincoln National Convertible Securities Fund (1)

 

19,000

 

19,000

 

0

 

127,001

 

73,741

 

53,260

Lydian Overseas Partners Master Fund LP (1)

 

125,000

 

125,000

 

0

 

2,466,969

 

485,138

 

1,981,832

Lyxor Convertible Arbitrage Fund

 

6,458

 

6,458

 

0

 

25,064

 

25,064

 

0

Lyxor Master Fund Ref: Argent/LowLev CB c/o Argent

 

61,230

 

61,230

 

0

 

237,640

 

237,640

 

0

Lyxor/Context Fund Ltd

 

2,750

 

2,750

 

0

 

10,673

 

10,673

 

0

Merrill-Lynch Insurance Group

 

2,456

 

2,456

 

0

 

9,532

 

9,532

 

0

Municipal Employees Trust

 

1,107

 

1,107

 

0

 

4,296

 

4,296

 

0

Nations Convertible Securities Fund (1)

 

100,000

 

100,000

 

0

 

988,665

 

388,110

 

600,555

New Orleans Firefighters Pension/Relief Fund

 

629

 

629

 

0

 

2,441

 

2,441

 

0

New York City Employees' Retirement System

 

10,000

 

10,000

 

0

 

38,811

 

38,811

 

0

New York City Police Pension Fund

 

5,000

 

5,000

 

0

 

19,406

 

19,406

 

0

Occidental Petroleum Corporation

 

2,321

 

2,321

 

0

 

9,008

 

9,008

 

0

Ohio Bureau of Workers Compensation

 

663

 

663

 

0

 

2,573

 

2,573

 

0

Oppenheimer Convertible Securities Fund

 

30,000

 

30,000

 

0

 

116,433

 

116,433

 

0

Partners Group c/o Quattro Fund

 

4,500

 

4,500

 

0

 

17,465

 

17,465

 

0

Pension Reserves Investment Trust

 

10,000

 

10,000

 

0

 

38,811

 

38,811

 

0

Policeman and Fireman Retirement System of the City of Detroit

 

1,990

 

1,990

 

0

 

7,723

 

7,723

 

0

Praxair, Inc.

 

1,700

 

1,700

 

0

 

6,598

 

6,598

 

0

Privilege Portfolio SICAV

 

50,000

 

50,000

 

0

 

194,055

 

194,055

 

0

Producers-Writers Guild of America Pension Plan

 

2,500

 

2,500

 

0

 

9,703

 

9,703

 

0

Pro-Mutual

 

6,734

 

6,734

 

0

 

26,135

 

26,135

 

0

Putnam Convertible Income-Growth Trust

 

51,535

 

51,535

 

0

 

200,012

 

200,012

 

0

Putnam High Income Bond Fund

 

8,865

 

8,865

 

0

 

34,406

 

34,406

 

0

Quattro Fund Ltd

 

22,500

 

22,500

 

0

 

87,325

 

87,325

 

0

Quattro Multi Strategy Masterfund LP

 

1,500

 

1,500

 

0

 

5,822

 

5,822

 

0

Ramius Capital Group

 

5,000

 

5,000

 

0

 

19,406

 

19,406

 

0

Ramius Master Fund, Ltd

 

8,000

 

8,000

 

0

 

31,049

 

31,049

 

0

Rampart Enhanced Convertible Investors, LLC

 

7,600

 

7,600

 

0

 

29,496

 

29,496

 

0

RCG Latitude Master Fund, Ltd. (1)

 

12,000

 

12,000

 

0

 

411,111

 

46,573

 

364,538

Reform Pension Board

 

1,500

 

1,500

 

0

 

5,822

 

5,822

 

0

Retirement Income Plan for Employees of
Armstrong World Industries, Inc.

 

1,500

 

1,500

 

0

 

5,822

 

5,822

 

0

Retirement Program Plan for Employees of the US Enrichment Corp

 

1,000

 

1,000

 

0

 

3,881

 

3,881

 

0

Rockwell Automation Master Trust

 

1,500

 

1,500

 

0

 

5,822

 

5,822

 

0

Sage Capital Management, LLC (1)

 

7,000

 

7,000

 

0

 

72,446

 

27,168

 

45,278

Silver Convertible Arbitrage Fund, LDC

 

13,920

 

13,920

 

0

 

54,025

 

54,025

 

0

Smith Barney Convertible Fund

 

10,000

 

10,000

 

0

 

38,811

 

38,811

 

0

Sphinx Convertible Arb Fund SPC c/o SSI
Investment Mgt.

 


7,061

 

7,061

 

0

 

27,404

 

27,404

 

0

Teachers' Retirement System for the City of New York

 

10,000

 

10,000

 

0

 

38,811

 

38,811

 

0

The Children's Memorial Medical Center

 

2,500

 

2,500

 

0

 

9,703

 

9,703

 

0

The City of Southfield Fire & Police Retirement System

 

325

 

325

 

0

 

1,261

 

1,261

 

0

The Estate of James Campbell CH

 

819

 

819

 

0

 

3,179

 

3,179

 

0

3

 

 

 

The Estate of James Campbell EST2

 

6,584

 

6,584

 

0

 

25,553

 

25,533

 

0

The Gabelli Global Convertible Securities Fund

 

2,000

 

2,000

 

0

 

7,762

 

7,762

 

0

The Grable Foundation

 

636

 

636

 

0

 

2,468

 

2,468

 

0

The Northwestern Mutual Life Insurance Company (1)

 

175,000

 

175,000

 

0

 

1,161,435

 

679,193

 

482,243

The TJX Companies Inc. Retirement Plan Trust

 

500

 

500

 

0

 

1,941

 

1,941

 

0

Trust Mark Insurance

 

1,283

 

1,283

 

0

 

4,979

 

4,979

 

0

University of Southern California

 

1,500

 

1,500

 

0

 

5,822

 

5,822

 

0

Viacom Inc. Pension Plan Master Trust

 

423

 

423

 

0

 

1,642

 

1,642

 

0

Vicis Capital Master Fund

 

50,000

 

50,000

 

0

 

194,055

 

194,055

 

0

Wachovia Securities International Ltd.

 

60,000

 

60,000

 

0

 

232,866

 

232,866

 

0

Waterstone Market Neutral MAC51, Ltd.

 

13,870

 

13,870

 

0

 

53,831

 

53,831

 

0

Waterstone Market Neutral Master Fund, Ltd.

 

136,130

 

136,130

 

0

 

528,334

 

528,334

 

0

Wyeth Retirement Plan U.S. Master Trust

 

1,500

 

1,500

 

0

 

5,822

 

5,822

 

0

Xavex Convertible Arbitrage 2 Fund

 

6,940

 

6,940

 

0

 

26,935

 

26,935

 

0

Xavex Convertible Arbitrage 10 Fund

 

10,740

 

10,740

 

0

 

41,683

 

41,683

 

0

* Includes common stock issuable upon conversion of Chesapeake’s 5.00% Cumulative Convertible Preferred Stock (Series 2005) at conversion rate of 3.8811 shares of common stock per share of preferred stock.

(1)

The number of shares of Common Stock indicated to be beneficially owned after completion of the offering includes shares issuable within 60 days of the date hereof upon conversion of convertible securities.

 

4