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Filing Details

Accession Number:: 0001181431-11-035546
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2011-06-07 18:27:54
Reporting Period:: 2011-06-06

Filing Date:: 2011-06-07
Accepted Time:: 2011-06-07 18:27:54
SEC Url:: Form 4 Filing

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1328650	Bronco Drilling Company Inc.	BRNC	Drilling Oil & Gas Wells (1381)	202902156

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
895126	Chesapeake Energy Corp	6100 North Western Avenue Oklahoma City OK 73118	No	No	Yes	No
949553	Chesapeake Operating Inc	6100 North Western Avenue Oklahoma City OK 73118	No	No	Yes	No
1141205	Nomac Drilling Llc	6100 North Western Avenue Oklahoma City OK 73118	No	No	Yes	No
1518462	Nomac Acquisition, Inc.	6100 North Western Avenue Oklahoma City OK 73118	No	No	Yes	No
1522031	Chesapeake Oilfield Services Llc	6100 North Western Avenue Oklahoma City OK 73118	No	No	Yes	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.01 Per Share	Acquisiton	2011-06-06	24,278,257	$11.00	24,278,257	No	4	P	Indirect	See Footnote
Common Stock, Par Value $0.01 Per Share	Acquisiton	2011-06-06	63,550,899	$11.00	87,829,156	No	4	P	Indirect	See Footnote
Common Stock, Par Value $0.01 Per Share	Acquisiton	2011-06-06	4,521,802	$11.00	1,000	No	4	P	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See Footnote
No	4	P	Indirect	See Footnote
No	4	P	Indirect	See Footnote

Footnotes

This form is a joint filing by Chesapeake Energy Corporation ("Chesapeake"), Chesapeake Operating, Inc., a direct wholly owned subsidiary of Chesapeake ("Operating"), Chesapeake Oilfield Services, L.L.C. ("Oilfield"), a direct wholly owned subsidiary of Operating, Nomac Drilling, L.L.C., a direct wholly owned subsidiary of Oilfield ("Drilling") and Nomac Acquisition Inc., a direct wholly owned subsidiary of Drilling ("Nomac").
Shares of Common Stock, par value $0.01 per share (the "Shares"), of Bronco Drilling Company, Inc. ("Bronco") acquired pursuant to the tender offer effected pursuant to the Agreement and Plan of Merger, dated as of April 14, 2011 and amended as of May 17, 2011 (as so amended, the "Merger Agreement"), by and among Chesapeake, Nomac and Bronco (such tender offer, the "Offer").
Shares were held by Nomac. As Nomac is an indirect wholly owned subsidiary of Chesapeake, Operating and Oilfield and a direct wholly owned subsidiary of Drilling, each of Chesapeake, Operating, Oilfield and Drilling may be deemed to have acquired indirect beneficial ownership of the Shares.
Shares acquired pursuant to the exercise of "top-up" option to purchase additional shares from Bronco, at $11.00 per share, under the terms of the Merger Agreement.
Reflects all of the outstanding shares of Bronco Drilling Company, Inc. not tendered in the Offer, which may be deemed to have been acquired by Chesapeake and Nomac pursuant to the consummation of the Merger (as defined below).
Following the exercise of the "top-up" option, Nomac was merged with and into Bronco, with Bronco surviving the Merger as an indirect wholly owned subsidiary of Chesapeake pursuant to a "short-form merger" under Delaware law (the "Merger"). At the effective time of the Merger, all of Bronco's previously outstanding stock held by the registrants were canceled. Prior to the Merger, Drilling directly held, and therefore Chesapeake, Operating and Oilfield may be deemed to have indirectly held, 1,000 shares of Nomac, which represented all of the issued and outstanding capital stock of Nomac. At the effective time of the Merger, each share of Nomac was converted into a share of the surviving company's stock.