Patterson UTI-Energy

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1) COMMITMENT INCREASE AND JOINDER AGREEMENT

Parties: PATTERSON UTI ENERGY INC | AMBAR LONE STAR FLUIDS SERVICES, LLC | BANK OF AMERICA, N.A.
Document Date: 8/4/2009
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

2) CREDIT AGREEMENT

Parties: PATTERSON UTI ENERGY INC | AMEGY BANK, NATIONAL ASSOCIATION | BANK OF AMERICA, N.A. | BANK OF TOKYO-MITSUBISHI UFJ, LTD. | COMERICA BANK | HSBC BANK USA, NA | WELLS FARGO BANK, NA
Law Firm: Fulbright Jaworski
Document Date: 3/25/2009
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

3) SECOND AMENDMENT TO THE PATTERSON-UTI ENERGY, INC. 2005 LONG-TERM INCENTIVE PLAN

Parties: PATTERSON UTI ENERGY INC
Document Date: 6/6/2008
Industry: Oil Well Services and Equipment
Sector: Energy

4) PATTERSON-UTI ENERGY, INC. CHANGE IN CONTROL AGREEMENT

Parties: PATTERSON-UTI ENERGY, INC
Document Date: 11/5/2007
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

5) FIRST AMENDMENT TO CHANGE IN CONTROL AGREEMENT BETWEEN PATTERSON-UTI ENERGY, INC. AND KENNETH N. BERNS

Parties: PATTERSON UTI ENERGY INC
Document Date: 11/5/2007
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

6) FIRST AMENDMENT TO CHANGE IN CONTROL AGREEMENT BETWEEN PATTERSON-UTI ENERGY, INC. AND JOHN E. VOLLMER III

Parties: PATTERSON-UTI ENERGY, INC
Document Date: 11/5/2007
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

7) FIRST AMENDMENT TO CHANGE IN CONTROL AGREEMENT

Parties: PATTERSON UTI ENERGY INC
Document Date: 11/5/2007
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

8) FIRST AMENDMENT TO CHANGE IN CONTROL AGREEMENT BETWEEN PATTERSON-UTI ENERGY, INC. AND MARK S. SIEGEL

Parties: PATTERSON UTI ENERGY INC
Document Date: 11/5/2007
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

9) FIRST AMENDMENT TO CHANGE IN CONTROL AGREEMENT

Parties: PATTERSON-UTI ENERGY, INC. | DOUGLAS J. WALL
Document Date: 11/5/2007
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

10) EMPLOYMENT AGREEMENT

Parties: PATTERSON UTI ENERGY INC
Law Firm: Fulbright Jaworski
Document Date: 9/24/2007
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

11) ASSET PURCHASE AGREEMENT

Parties: KEY ENERGY SERVICES INC | Key Energy Drilling, Inc | Key Energy Drilling Beneficial, L.P | Key Rocky Mountain, Inc. | Key Four Corners, Inc. | Patterson-UTI Drilling Company LP, LLLP | Patterson-UTI Energy, Inc.
Law Firm: Porter & Hedges, L.L.P.;Fulbright & Jaworski L.L.P.
Document Date: 10/19/2006
Industry: Oil Well Services and Equipment
Governing Law:Texas

12) EMPLOYMENT AGREEMENT

Parties: PATTERSON UTI ENERGY INC | A. Glenn Patterson
Document Date: 5/5/2006
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

13) PATTERSON-UTI ENERGY, INC. 2005 LONG-TERM INCENTIVE PLAN

Parties: PATTERSON UTI ENERGY INC
Document Date: 6/21/2005
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Delaware

14) TERMINATION AGREEMENT

Parties: PATTERSON UTI ENERGY INC
Document Date: 2/25/2005
Industry: Oil Well Services and Equipment

15) ASSET PURCHASE AGREEMENT

Parties: PATTERSON UTI ENERGY INC | Key Energy Drilling, Inc. | Key Energy Drilling beneficial, L.P. | Key rocky mountain, inc. | Key four corners, inc. | Key Energy Services, Inc. | Patterson-UTI Drilling Company LP, LLLP | Patterson-UTI Energy, Inc.
Document Date: 2/25/2005
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

16) Exhibit 2.1 ASSET PURCHASE AGREEMENT among Key Energy Drilling, Inc. Key Energy Drilling beneficial, L.P. Key rocky mountain, inc. Key four corners, inc. and Key Energy Services, Inc. and Patterson-UTI Drilling Company LP, LLLP and Patterson-UTI Energy, Inc. Dated as of December 7, 2004

Parties: Key Energy Drilling, Inc | Key Energy Services, Inc | KEY FOUR CORNERS, INC | KEY ROCKY MOUNTAIN, INC | Patterson (GP) LLC | Patterson-UTI Drilling Company LP | Patterson-UTI Energy, Inc
Law Firm: Porter Hedges;Fulbright Jaworski
Document Date: 2/25/2005
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

17) Summary Description of 2003 Cash Bonus Plan

Parties: PATTERSON UTI ENERGY INC
Document Date: 2/25/2005
Industry: Oil Well Services and Equipment

18) Summary Description of Director Compensation

Parties: PATTERSON UTI ENERGY INC
Document Date: 2/25/2005
Industry: Oil Well Services and Equipment

19) AGREEMENT AND PLAN OF MERGER

Parties: PATTERSON UTI ENERGY INC | PATTERSON-UTI ACQUISITION, LLC | TMBR/SHARP DRILLING, INC.
Law Firm: Fulbright & Jaworski L.L.P.; Lynch, Chappell & Alsup, P.C.; Haynes and Boone, LLP
Document Date: 2/12/2004
Industry: Oil Well Services and Equipment
Sector: Energy
Governing Law:Texas

20) PATTERSON-UTI ENERGY, INC. CHANGE IN CONTROL AGREEMENT