form13da5.htm

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 5)*

BRONCO DRILLING COMPANY, INC.

(Name of Issuer)

Shares of Common Stock, par value $.01 per share

(Title of Class of Securities)

112211107

(CUSIP Number)

Arthur H. Amron, Esq.

Wexford Capital LP

411 West Putnam Avenue

Greenwich, CT 06830

(203) 862-7012

(Name, Address and Telephone Number of Person Authorized to

Receive Notices and Communications)

—with copies to —

Gregg Berman, Esq.

Fulbright & Jaworski L.L.P.

666 Fifth Avenue

New York, NY 10103

(212) 318-3000

August 3, 2009

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), Rule 13d-1(f) or Rule 13d-1(g), check the following box.o

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See section 240.13d-7 for other parties to whom copies are to be sent.

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or other subject to the liabilities of that section of Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 112211107
1	Names of Reporting Persons. I.R.S. Identification Nos. of above Persons (entities only)			Wexford Catalyst Investors LLC
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a) x (b) o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e			o
6	Citizenship or Place of Organization			Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			1,021,624
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			1,021,624
11	Aggregate Amount Beneficially Owned by Each Reporting Person					1,021,624
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) o
13	Percent of Class Represented by Amount in Row (11)				3.75%
14	Type of Reporting Person (See Instructions)			OO

220564.1

CUSIP No. 112211107
1	Names of Reporting Persons. I.R.S. Identification Nos. of above Persons (entities only)			Wexford Spectrum Trading Limited
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a) x (b) o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e			o
6	Citizenship or Place of Organization			Cayman Islands
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			1,782,270
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			1,782,270
11	Aggregate Amount Beneficially Owned by Each Reporting Person					1,782,270
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) o
13	Percent of Class Represented by Amount in Row (11)				6.55%
14	Type of Reporting Person (See Instructions)			CO

220564.1

CUSIP No. 112211107
1	Names of Reporting Persons. I.R.S. Identification Nos. of above Persons (entities only)			Wexford Capital LP
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a) x (b) o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e			o
6	Citizenship or Place of Organization			Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			2,803,894
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			2,803,894
11	Aggregate Amount Beneficially Owned by Each Reporting Person					2,803,894
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) o
13	Percent of Class Represented by Amount in Row (11)				10.30%
14	Type of Reporting Person (See Instructions)			PN

220564.1

CUSIP No. 112211107
1	Names of Reporting Persons. I.R.S. Identification Nos. of above Persons (entities only)			Wexford GP LLC
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a) x (b) o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e			o
6	Citizenship or Place of Organization			Delaware
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			2,803,894
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			2,803,894
11	Aggregate Amount Beneficially Owned by Each Reporting Person					2,803,894
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) o
13	Percent of Class Represented by Amount in Row (11)				10.30%
14	Type of Reporting Person (See Instructions)			OO

220564.1

CUSIP No. 112211107
1	Names of Reporting Persons. I.R.S. Identification Nos. of above Persons (entities only)			Charles E. Davidson
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a) x (b) o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e			o
6	Citizenship or Place of Organization			United States
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			2,803,894
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			2,803,894
11	Aggregate Amount Beneficially Owned by Each Reporting Person					2,803,894
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) o
13	Percent of Class Represented by Amount in Row (11)				10.30%
14	Type of Reporting Person (See Instructions)			IN

220564.1

CUSIP No. 112211107
1	Names of Reporting Persons. I.R.S. Identification Nos. of above Persons (entities only)			Joseph M. Jacobs
2	Check the Appropriate Box if a Member of a Group (See Instructions) (a) x (b) o
3	SEC Use Only
4	Source of Funds (See Instructions)			OO
5	Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e			o
6	Citizenship or Place of Organization			United States
Number of Shares Beneficially Owned by Each Reporting Person With		7	Sole Voting Power			0
		8	Shared Voting Power (see Item 5 below)			2,803,894
		9	Sole Dispositive Power			0
		10	Shared Dispositive Power (see Item 5 below)			2,803,894
11	Aggregate Amount Beneficially Owned by Each Reporting Person					2,803,894
12	Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions) o
13	Percent of Class Represented by Amount in Row (11)				10.30%
14	Type of Reporting Person (See Instructions)			IN

220564.1

This Amendment No. 5 to Schedule 13D modifies and supplements the Schedule 13D initially filed on July 25, 2008, as amended (the "Statement"), with respect to the common stock, $0.01 par value per share (the “Common Stock”), of Bronco Drilling Company, Inc. (the “Company”). Except to the extent supplemented by the information contained in this Amendment No. 5, the Statement, as previously amended and as amended as provided herein, remains in full force and effect. Capitalized terms used herein without definition have the respective meanings ascribed to them in the Statement.

Item 3.

Source and Amount of Funds or Other Consideration.

The shares of Common Stock beneficially owned by the Reporting Persons were acquired through open market purchases using the general funds of the Purchasing Entities, which funds were contributed by investors in such entities. The net investment cost (including commissions, if any) is approximately $39,199,754. Such shares are held by the Purchasing Entities.

Item 5.

Interest in Securities of the Issuer

The aggregate number and percentage of shares of Common Stock beneficially owned by the Reporting Persons (on the basis of 27,217,459 shares of Common Stock issued and outstanding as reported in the Company’s Form 10-K/A filed with the Commission on June 30, 2009) are as follows:

Wexford Catalyst Investors LLC
(a) Amount beneficially owned:	1,021,624	Percent of class:		3.75%
(b) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:			0
(ii) Shared power to vote or to direct the vote:			1,021,624
(iii) Sole power to dispose or to direct the disposition of:			0
(iv) Shared power to dispose or to direct the disposition of:			1,021,624

Wexford Spectrum Trading Limited
(a) Amount beneficially owned:	1,782,270	Percent of class:		6.55%
(b) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:			0
(ii) Shared power to vote or to direct the vote:			1,782,270
(iii) Sole power to dispose or to direct the disposition of:			0
(iv) Shared power to dispose or to direct the disposition of:			1,782,270

Wexford Capital LP
(a) Amount beneficially owned:	2,803,894	Percent of class:		10.30%
(b) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:			0
(ii) Shared power to vote or to direct the vote:			2,803,894
(iii) Sole power to dispose or to direct the disposition of:			0
(iv) Shared power to dispose or to direct the disposition of:			2,803,894

Wexford GP LLC
(a) Amount beneficially owned:	2,803,894	Percent of class:		10.30%
(b) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:			0
(ii) Shared power to vote or to direct the vote:			2,803,894
(iii) Sole power to dispose or to direct the disposition of:			0
(iv) Shared power to dispose or to direct the disposition of:			2,803,894

Charles E. Davidson
(a) Amount beneficially owned:	2,803,894	Percent of class:		10.30%
(b) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:			0
(ii) Shared power to vote or to direct the vote:			2,803,894
(iii) Sole power to dispose or to direct the disposition of:			0
(iv) Shared power to dispose or to direct the disposition of:			2,803,894

Joseph M. Jacobs
(a) Amount beneficially owned:	2,803,894	Percent of class:		10.30%
(b) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:			0
(ii) Shared power to vote or to direct the vote:			2,803,894
(iii) Sole power to dispose or to direct the disposition of:			0
(iv) Shared power to dispose or to direct the disposition of:			2,803,894

Wexford Capital may, by reason of its status as managing member or sub investment manager of the Purchasing Entities, be deemed to own beneficially the shares of Common Stock of which the Purchasing Entities possess beneficial ownership. Wexford GP may, as the General Partner of Wexford Capital, be deemed to own beneficially the shares of Common Stock of which the Purchasing Entities possess beneficial ownership. Each of Messrs. Davidson and Jacobs may, by reason of his status as a controlling person of the Wexford GP, be deemed to own beneficially the shares of Common Stock of which the Purchasing Entities possess beneficial ownership. Each of Messrs. Davidson and Jacobs, Wexford GP and Wexford Capital shares the power to vote and to dispose of the shares of Common Stock beneficially owned by the Purchasing Entities. Each of Wexford Capital, Wexford GP and Messrs. Davidson and Jacobs disclaims beneficial ownership of the shares of Common Stock owned by the Purchasing Entities and this report shall not be deemed as an admission that they are the beneficial owner of such securities except, in the case of Messrs. Davidson and Jacobs, to the extent of their respective personal ownership interests in any of the Purchasing Entities.

Except as set forth in Item 3 above, the Reporting Persons have not effected any transactions in the Common Stock during the 60 days preceding the date of this Schedule 13D.

* * * * *

220564.1

SIGNATURE

After reasonable inquiry and to the best of each of the undersigned’s knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: August 5, 2009

	WEXFORD CATALYST INVESTORS LLC

	By:	/Arthur Amron/
	Name:	Arthur Amron
	Title:	Vice President and Assistant Secretary


	WEXFORD SPECTRUM TRADING LIMITED

	By:	/Arthur Amron/
	Name:	Arthur Amron
	Title:	Vice President

	WEXFORD CAPITAL LP

	By:	/Arthur Amron/
	Name:	Arthur Amron
	Title:	Partner and Secretary

	WEXFORD GP LLC

	By:	/Arthur Amron/
	Name:	Arthur Amron
	Title:	Vice President and Assistant Secretary

	/Charles E. Davidson/
	Charles E. Davidson

	/Joseph M. Jacobs/
	Joseph M. Jacobs