UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): ~~May 23~~June 9, 2011 (~~May~~June 173, 2011)

BRONCO DRILLING COMPANY, INC.

(Exact name of Registrant as specified in its charter)

Delaware	000-51471	20-2902156
(State or other jurisdiction of incorporation or organization)	Commission File Number	(I.R.S. Employer Identification No.)
16217 North May Avenue Edmond, Oklahoma		73013
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (405) 242-4444

16217 North May Avenue

Edmond, Oklahoma

73013

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number, including area code:

(405) 242-4444

(Former name, former address and former fiscal year, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

~~Item~~Introductory ~~1.01~~Note ~~Entry into a Material Definitive Agreement.~~

~~Amendment~~As previously reported, on April 14, 2011, Chesapeake Energy Corporation, an Oklahoma corporation (“Chesapeake”), Nomac Acquisition, Inc., a Delaware corporation and an indirect wholly owned subsidiary of Chesapeake (“Purchaser”) and Bronco Drilling Company, Inc., a Delaware corporation (“Bronco”), entered into an Agreement and Plan of Merger, dated as of April 14, 2011 and amended as of May 17, 2011 (as so amended, the “Merger Agreement”). Pursuant to the Merger Agreement, and upon the terms and subject to the conditions thereof, Purchaser agreed to purchase all outstanding shares of Bronco’s common stock (the “Shares”) at a price per Share of $11.00 in cash, without interest and less any required withholding taxes (the “Offer Price”), upon the terms and subject to the conditions set forth in the Offer to Purchase, dated April 26, 2011 (“Offer to Purchase”) and in the related Letter of Transmittal (which, collectively, together with any amendments or supplements, constitute the “Offer”).

AsPursuant ~~previously~~to ~~reported~~the terms and conditions of the Merger Agreement, onthe Offer expired at ~~April~~5:00 p.m., New York City time, on Friday, June 143, 2011,. ~~Bronco~~According ~~Drilling~~to Computershare Trust Company, ~~Inc~~N.A., athe ~~Delaware~~depositary ~~corporation~~for (the ~~“Company”)~~Offer, ~~entered~~as ~~into~~of ansuch ~~Agreement~~time, ~~and~~(i) including ~~Plan~~Shares oftendered ~~Merger~~by ~~(as~~notice ~~amended~~of onguaranteed ~~May 17~~delivery, ~~2011~~an aggregate of approximately 24,959,224 ~~the~~Shares ~~“Merger~~were ~~Agreement”)~~validly ~~with~~tendered ~~Chesapeake Energy~~and ~~Corporation~~not withdrawn pursuant to the Offer, anwhich ~~Oklahoma~~represented ~~corporation~~approximately ~~(“Chesapeake”)~~86.7% of the then outstanding Shares, and ~~Nomac~~(ii) excluding ~~Acquisition~~Shares tendered by notice of guaranteed delivery, ~~Inc.~~an aggregate of approximately 24,267,257 aShares ~~Delaware~~were ~~corporation~~validly tendered and annot ~~indirect~~withdrawn ~~wholly~~pursuant ~~owned~~to ~~subsidiary~~the Offer, which represented approximately 84.3% of ~~Chesapeake~~the ~~(“Merger~~then ~~Sub”)~~outstanding Shares. ~~Pursuant~~On toJune 6, 2011, Purchaser accepted all of the ~~Merger~~Shares ~~Agreement~~that were validly tendered and ~~upon~~not ~~the~~withdrawn ~~terms~~for ~~and~~payment ~~subject~~pursuant to the ~~conditions~~terms ~~thereof,~~of the Offer. Also on ~~April~~June 266, 2011, pursuant to the terms and conditions of the Merger ~~Sub~~Agreement, ~~commenced~~Purchaser aexercised ~~tender~~its ~~offer~~top-up option (the “~~Offer~~Top-Up Option”) to purchase ~~all~~shares of ~~the~~Bronco’s ~~issued~~common ~~and~~stock ~~outstanding~~to ~~shares~~enable ofit ~~the~~to ~~common~~hold ~~stock~~more than 90% of Bronco’s outstanding Shares so that it could use the ~~Company~~“short form” merger provisions available under Delaware law, ~~par~~which ~~value~~allowed the completion of the $0Merger without a vote or meeting of shareholders of Bronco.01 ~~per~~Accordingly, ~~share~~on June 6, 2011, Bronco issued 63,550,899 Shares (the “Top-Up Shares”) to Purchaser, ~~for~~at a price per Share of $11.00. ~~per~~As ~~share~~a inresult ~~cash~~of exercising the Top-Up Option, ~~without~~Purchaser ~~interest~~acquired more than 90% of the outstanding Shares and, ~~less~~pursuant ~~any~~to ~~required~~the ~~withholding~~terms ~~taxes~~and conditions of the Merger Agreement, Purchaser was merged with and into Bronco (~~such~~the ~~amount~~“Merger”) on June 6, 2011 in accordance with the “~~Offer~~short ~~Price~~form”) merger provisions available under Delaware law. The following events took place in connection with the expiration of the Offer and consummation of the Merger:

OnItem ~~May 17,~~1.02. ~~2011,~~Termination ~~in connection with the memorandum~~ of understanding described below, the Company, Chesapeake and Merger Sub entered into an amendment to the Merger Agreement (the “Amendment”) pursuant to which (i) the Company consented to Merger Sub’s extension of the expiration date of the Offer from May 23, 2011 to May 31, 2011 and (ii) the period following a ~~termination~~Material ofDefinitive ~~the Merger~~ Agreement ~~when the Termination Fee (as defined in the Merger Agreement) may be payable under the limited circumstances specified in the Merger Agreement was reduced from twelve (12) months to nine (9) months~~.

The Merger Agreement, asprovides ~~amended,~~that ~~remains~~if inPurchaser ~~full~~purchases ~~force~~Shares ~~and~~pursuant ~~effect.~~to ~~The~~the ~~foregoing description~~Offer, or if the effective time of the Merger ~~Agreement~~occurs, isthen ~~qualified~~the bywarrant ~~reference~~(the “Warrant”) related to the Warrant ~~full~~Agreement ~~text of~~ (the ~~Merger~~“Warrant Agreement”), ~~which~~dated isSeptember 18, ~~included~~2009, asbetween ~~Exhibit~~Bronco 2and Banco Inbursa S.1A., Institución de Banca Multiple, Grupo Financiero Imbursa (to the ~~Company’s~~extent ~~Current~~it ~~Report~~is onunexercised ~~Form~~and ~~8-K~~outstanding ~~filed~~as byof immediately prior to the ~~Company~~Conversion Time (as ofdefined ~~April 18~~below)), ~~2011~~will terminate at the Conversion Time and ~~is incorporated~~the byholder ~~reference~~will receive an amount in cash equal to ~~this~~the ~~Item~~ product of (1~~.01.~~) the ~~The~~number ~~foregoing~~of ~~description~~Shares that were purchasable upon exercise of the Warrant ~~Amendment~~as isof ~~qualified~~the byConversion ~~reference~~Time toand (2) the ~~full~~offer ~~text~~price less the exercise price of the ~~Amendment,~~Warrant. ~~which~~The is“Conversion ~~included~~Time” asmeans ~~Exhibit~~the earliest to occur of (da) the effective time of the Merger, (4b) 20 tobusiness ~~Amendment~~days ~~No. 3~~after the toexpiration date or, if there is a subsequent offering period following the ~~Tender~~expiration ~~Offer~~date, ~~Statement~~the expiration of the last subsequent offering period, and (3) September 1, 2011. The Conversion Time occurred on June 6, 2011, in ~~Schedule~~connection TOwith ~~filed~~the byeffective ~~Chesapeake~~time ~~and~~of the Merger, ~~Sub~~at aswhich oftime ~~May~~the Warrant terminated. On June 188, 2011, ~~and~~Chesapeake delivered to the warrant holder $21,763,080, which is ~~incorporated~~an byamount ~~reference~~in cash equal to ~~this~~the ~~Item~~ product of (1) 5,440,770 Shares that were purchasable upon exercise of the Warrant as of the Conversion Time and (2) the offer price of $11.0100 less the $7.00 exercise price of the Warrant.

~~Item~~In 8connection with the Offer and Merger, on June 6, 2011, from its cash on hand, Bronco repaid to Banco Inbursa S.01A., ~~Other~~Institución ~~Events~~de Banca Múltiple, Grupo Financiero Inbursa (“Inbursa”), all of its outstanding obligations under its Credit Agreement, dated as of September 18, 2009 (as amended, the “Credit Agreement”) among Bronco and Inbursa. In connection therewith, the Credit Agreement and all lending commitments thereunder, have been terminated.

~~Ten putative~~Item ~~class action lawsuits relating to the Merger Agreement and the transactions contemplated therein were commenced against the Company~~2. Six of these suits were filed in the District Court of Oklahoma County, Oklahoma (collectively, the “Oklahoma Suits”), and four were filed in the Court of Chancery of the State of Delaware (the “Delaware Suits”)01. ~~All~~Completion ~~but one~~ of ~~the~~Acquisition ~~Oklahoma~~or ~~Suits~~Disposition ~~have been voluntarily dismissed. On May 6, 2011, the Delaware Suits were consolidated into a single action. On May 10, 2011, the remaining Oklahoma Suit was stayed in favor~~ of ~~the Delaware Suits~~Assets. ~~These suits name as defendants the Company, the members of the Company’s board of directors, and in certain instances, Chesapeake and Merger Sub.~~

~~While~~The ~~the~~information ~~Company~~set ~~and~~forth ~~the other defendants believe that each of the aforementioned lawsuits is without merit and that they have valid defenses to all claims,~~ in anItems effort to minimize the cost and expense of any litigation relating to such lawsuits, on May 17, 2011, the Company and other defendants entered into a memorandum of understanding (the “MOU”) with the parties to the Delaware Suits pursuant to which the Company and such parties agreed in principle, and subject to certain conditions, to settle those lawsuits1.02 ~~Subject to approval of the Delaware Court of Chancery~~ and further definitive documentation, the MOU establishes a framework to resolve the Delaware Suits against the Company and the other defendants in connection with the Merger Agreement and contemplates a release and settlement of all claims against the Company and other defendants and their affiliates and agents in connection with the Merger Agreement5.01 ~~In exchange for such release and settlement, pursuant to the terms~~ of ~~the~~this ~~MOU,~~Current ~~the~~Report parties agreed that (i) the Company, Chesapeake, and Merger Sub would modify the Merger Agreement to reflect the Amendment described above, (ii) the Company would provide additional disclosures in an amendment to its Solicitation/Recommendation Statement on ~~Schedule~~ ~~14D~~Form 8-9,K which amendment was filed on May 18, 2011 and (iii) Chesapeake and Merger Sub would extend the expiration of the Offer from 12:00 midnight, New York City time, at the end of Monday, May 23, 2011 to 12:00 midnight, New York City time, at the end of Tuesday, May 31, 2011. The settlement is ~~also~~incorporated ~~contingent~~herein ~~upon,~~by ~~among other things, consummation of the Merger (as defined in the Merger Agreement)~~reference.

OnItem ~~May 20,~~3.01. ~~2011,~~Notice ~~the~~of ~~Delaware~~Delisting ~~Court~~or ofFailure ~~Chancery~~to ~~granted~~Satisfy a ~~motion~~Continued ~~filed~~Listing byRule ~~the~~or ~~plaintiffs~~Standard; inTransfer ~~the~~of ~~Delaware~~ Listing.

~~Suits~~Pursuant to ~~certify~~the aterms ~~class.~~and ~~The~~conditions ~~order~~of ~~entered by~~ the ~~Court,~~Merger ~~among other things~~Agreement, ~~certified~~Purchaser awas ~~class~~merged ~~consisting~~with ofand ~~all~~into ~~record~~Bronco ~~and~~on ~~beneficial~~June 6, ~~holders~~2011 ofin accordance with the ~~Company’s~~“short ~~common~~form” ~~stock~~merger atprovisions ~~any~~available ~~time between~~under ~~April 14~~Delaware law, ~~2011~~which ~~and~~allow the ~~date~~completion of ~~consummation~~the Merger without a vote or meeting of ~~the~~shareholders ~~merger~~of ~~(the~~Bronco, ~~“Class”).~~since ~~Excluded~~Purchaser ~~from~~had ~~the~~acquired ~~Class~~more ~~are~~than 90% of the ~~Company~~outstanding Shares. On June 6, ~~Chesapeake~~2011, ~~Merger~~in ~~Sub,~~connection D.with ~~Frank~~the ~~Harrison~~Merger, ~~Richard~~Bronco B.notified ~~Hefner,~~the ~~Gary~~NASDAQ C.Global ~~Hill,~~Select ~~David~~Market W.(“NASDAQ”) ~~House~~of ~~and~~its ~~William~~intent ~~R. Snipes~~to orremove ~~any~~its ofShares ~~their~~from ~~respective~~listing ~~families,~~on ~~parent~~NASDAQ ~~entities,~~and ~~controlling~~requested ~~persons,~~that ~~associates,~~NASDAQ ~~predecessors,~~file ~~successors,~~a ~~affiliates~~delisting orapplication ~~subsidiaries,~~with the Securities and ~~each~~Exchange ~~and~~Commission ~~all~~(“SEC”) ofto ~~their~~delist ~~respective~~and ~~past~~deregister orits ~~present~~common ~~officers,~~stock. ~~directors,~~On ~~stockholders~~June 6, ~~principals~~2011, ~~representatives,~~ ~~employees,~~NASDAQ ~~attorneys,~~filed ~~financial~~with orthe ~~investment~~SEC ~~advisors,~~a ~~consultants,~~Notification ~~accountants,~~of ~~investment~~Removal ~~bankers,~~from ~~commercial~~Listing ~~bankers,~~and/or ~~entities~~Registration ~~providing~~under ~~fairness~~Section 12(b) ~~opinions,~~of ~~underwriters,~~the Securities ~~brokers,~~Exchange ~~dealers~~Act of 1934, ~~advisors~~as oramended ~~agents,~~(the ~~heirs,~~“Exchange ~~executors~~Act”), ~~trustees,~~ ~~general~~on orForm ~~limited~~25 ~~partners~~to ordelist ~~partnerships,~~and ~~limited~~deregister ~~liability~~Bronco’s ~~companies,~~common ~~members,~~stock. ~~managers,~~Bronco ~~joint~~will ~~ventures,~~file ~~personal~~with orthe ~~legal~~SEC ~~representatives,~~a ~~estates,~~certification ~~administrators,~~on ~~predecessors,~~Form ~~successors~~15 ~~and~~under ~~assigns.~~the InExchange ~~addition~~Act, requesting the deregistration ~~Court~~of ~~certified plaintiffs~~Bronco’s tocommon stock and the ~~Delaware~~suspension ~~Suits~~of asBronco’s ~~the~~reporting ~~representatives~~obligations under Sections 13 and 15(d) of the ~~Class~~Exchange ~~and~~Act. ~~their~~Trading ~~counsel~~of asShares ~~co-lead~~on ~~counsel~~NASDAQ ~~for~~was suspended after the ~~Class.~~close of trading on June 6, 2011.

~~In the~~Item ~~event the settlement anticipated by the MOU is not approved, the Company will continue to vigorously defend these actions~~3.02 ~~This~~Unregistered ~~summary~~Sale of ~~the~~Equity ~~MOU does not purport to be complete and is qualified in its entirety by reference to the MOU, which is included as Exhibit (a)(5)(O) to the Company’s Amendment No~~Securities. ~~2 to the Solicitation/Recommendation Statement on Schedule 14D-9 filed by the Company as of May 18, 2011 and is incorporated by reference to this Item 8.01.~~

OnIn ~~May~~order to complete the Merger, on June 183, 2011, ~~Chesapeake~~pursuant ~~and~~to Section 1.02 of the ~~Company~~Merger ~~issued~~Agreement, aPurchaser ~~joint~~exercised ~~press~~its ~~release~~Top-Up ~~announcing~~Option ~~the~~to ~~entry~~purchase ~~into~~shares ~~the~~of ~~Amendment~~Bronco’s ~~and~~common stock to enable to it hold more than 90% of Bronco’s outstanding Shares so that it could use the ~~MOU.~~“short ~~The press~~form” ~~release~~merger isprovisions ~~included~~available asunder ~~Exhibit~~Delaware (law, which allowed the completion of the Merger without a~~)(5)(P)~~ tovote ~~Amendment~~or Nomeeting of shareholders of Bronco. Accordingly, on June 36, 2011, Bronco issued 63,550,899 Top-Up Shares to ~~the~~Purchaser, ~~Tender~~at ~~Offer~~a ~~Statement~~price onper ~~Schedule~~Share TOof ~~filed~~$11.00. Purchaser paid for the Top-Up Shares by ~~Chesapeake~~delivery of $635,508.99 in cash and ~~Merger~~$698,424,380.01 ~~Sub~~in asa promissory note, for an aggregate price of ~~May 18~~$699,059,889.00. ~~2011~~Bronco offered and issold ~~incorporated~~the byTop-Up ~~reference~~Shares in a private placement pursuant to ~~this~~an ~~Item~~exemption from registration provided by Section 84(2) of the Securities Act of 1933, as amended (the “Securities Act”).~~01.~~

~~Notice~~Item 3.03. Material Modifications to ~~Investors~~Rights of Security Holders.

~~This~~At ~~Current~~the ~~Report~~effective ontime ~~Form 8-K is neither an offer to purchase nor a solicitation~~ of anthe ~~offer~~Merger, toeach ~~sell~~issued ~~any~~and ~~securities.~~outstanding ~~The~~Share ~~Offer~~(other ~~described in~~than ~~this report commenced on April~~(i) ~~26,~~any ~~2011,~~Shares ~~and,~~directly inowned ~~connection~~by ~~with the Offer~~Chesapeake, ~~Chesapeake~~Purchaser ~~has~~or ~~caused~~any ~~Merger~~other ~~Sub~~wholly toowned ~~file~~subsidiary ~~with~~of ~~the~~Chesapeake, (ii) Shares ~~SEC~~directly aowned ~~tender~~by ~~offer~~Bronco ~~statement~~or onany ~~Schedule~~wholly TOowned ~~(including~~subsidiaries ~~the offer to purchase, letter~~ of ~~transmittal~~Bronco and ~~related tender offer documents~~(iii). any ~~The~~Shares ~~Company~~held ~~has~~by ~~filed~~stockholders ~~with~~who ~~the~~did ~~SEC~~not aconsent ~~solicitation/recommendation statement with respect~~ to the ~~tender~~Merger ~~offer on Schedule 14D-9. Investors~~ and ~~the~~who ~~Company’s~~have ~~stockholders~~validly ~~are~~exercised ~~advised~~their tostatutory ~~read~~rights ~~carefully~~of ~~these~~appraisal ~~documents,~~in ~~and~~connection with the ~~amendments~~Merger ~~thereto~~pursuant ~~that~~to ~~have~~the ~~been~~applicable orprovisions ~~will~~of beSection 262 ~~filed~~of ~~with~~ the ~~SEC,~~Delaware ~~because~~General ~~they~~Corporation ~~contain~~Law) ~~important~~was ~~information.~~converted ~~These~~into ~~documents~~the ~~are~~right ~~available~~ to ~~all~~receive ~~stockholders of~~ the ~~Company~~Offer ~~at no expense to them~~Price. ~~These~~At ~~documents~~the ~~are~~effective ~~also~~time ~~available~~of atthe noMerger, ~~charge from~~holders ~~the~~of ~~SEC’s~~such ~~website~~Shares atceased ~~www.sec.gov.~~to Inhave any ~~addition,~~rights ~~investors~~as ~~and~~holders ~~stockholders~~ of ~~the~~Shares ~~Company~~(other ~~may~~than ~~obtain~~their aright ~~free~~to ~~copy~~receive ~~of these documents from~~ the ~~Company~~Offer byPrice) ~~contacting~~and ~~Bronco~~accordingly ~~Drilling~~no ~~Company,~~longer ~~Inc.~~have atany ~~16217~~interest N.in ~~May~~Bronco’s ~~Ave.,~~future ~~Edmond,~~earnings OKor ~~73013, attention: Investor Relations~~growth.

~~Forward~~Item ~~Looking~~5.01. ~~Statements~~Changes in Control of Registrant.

~~Certain~~The ~~statements~~Offer ~~either~~expired ~~contained~~at in5:00 ~~or incorporated by reference into this document are “forward-looking statements~~p.~~” These forward-looking statements generally include statements that are predictive in nature~~m., ~~depend~~New ~~upon~~York orCity ~~refer to future events or conditions~~time, ~~and are based~~ on ~~current~~Friday, ~~expectations~~June 3, ~~and~~2011. ~~assumptions~~According ~~that are subject~~ to ~~risks~~Computershare ~~and~~Trust ~~uncertainties~~Company, ~~which may cause actual results to differ materially from the forward looking statements~~N.A., ~~Such forward-looking statements include~~ the ~~ability~~depositary offor the ~~Company~~Offer, ~~Chesapeake~~as ~~and~~of ~~Merger~~such ~~Sub to complete the transactions contemplated by the Merger Agreement~~time, (i) including ~~the~~Shares tendered ~~parties’~~by ~~ability~~notice toof ~~satisfy~~guaranteed ~~the~~delivery, ~~conditions~~an toaggregate ~~the consummation~~ of ~~the~~approximately ~~Offer~~24,959,224 ~~and~~Shares ~~the~~were ~~other~~validly ~~conditions~~tendered ~~set forth in the Merger Agreement~~ and ~~the~~not ~~possibility~~withdrawn ofpursuant ~~any termination of the Merger Agreement. Actual results may differ materially from current expectations because of risks associated with uncertainties as~~ to the ~~timing of the~~ Offer, ~~and~~which ~~the~~represented ~~subsequent~~approximately ~~Merger;~~86.7% ~~uncertainties as to how many~~ of the ~~Company’s~~then ~~stockholders~~outstanding ~~will tender their~~ Shares, inand ~~the Offer; the risk that competing offers or acquisition proposals will be made; the~~(ii) excluding ~~possibility~~Shares ~~that~~tendered ~~various~~by ~~conditions~~notice ~~to the consummation~~ of ~~the~~guaranteed ~~Offer~~delivery, oran ~~the~~aggregate ~~subsequent Merger may not be satisfied or waived; the effects~~ of ~~disruption~~approximately ~~from~~24,267,257 ~~the~~Shares ~~transactions~~were onvalidly ~~the~~tendered ~~Company’s business~~ and ~~the~~not ~~fact~~withdrawn ~~that~~pursuant ~~the announcement and pendency of the transactions may make it more difficult~~ to ~~establish or maintain relationships with employees, suppliers and other business partners;~~ the ~~risk that stockholder litigation in connection with the~~ Offer ~~or the Merger Agreement may result in significant costs of defense~~, ~~indemnification~~which ~~and~~represented ~~liability;~~approximately ~~the~~84.3% ~~risk that the MOU may not be approved or its conditions may not be satisfied; other uncertainties pertaining to the business~~ of the ~~Company,~~then ~~including,~~outstanding ~~among~~Shares. ~~other~~Purchaser ~~things,~~accepted ~~the~~all ~~risks~~of ~~detailed in~~ the ~~Company’s~~Shares ~~public filings with the SEC from time to time, including the Company’s most recent Annual Report on Form 10-K for the~~

~~year~~that ~~ended~~were ~~December 31,~~validly ~~2010.~~tendered ~~The~~and ~~reader~~not iswithdrawn ~~cautioned~~for ~~not~~payment pursuant to, ~~unduly~~and ~~rely~~in onaccordance ~~these~~with, ~~forward-looking~~the ~~statements.~~terms ~~The~~of ~~Company~~the ~~expressly~~Offer, ~~disclaims~~for ~~any~~an ~~intent~~aggregate orpurchase ~~obligation~~price toof ~~update~~approximately or$274,551,464.00 ~~revise~~(which ~~publicly~~includes ~~these~~Shares ~~forward-looking~~tendered ~~statements~~by ~~except~~notice asof ~~required~~guaranteed delivery). A copy of the press release issued by ~~law~~Chesapeake on June 6, 2011 regarding the expiration and results of the tender offer is filed as Exhibit 99.1 hereto and is incorporated herein by reference.

~~Item~~Pursuant 9to the terms and conditions of the Merger Agreement, Purchaser exercised the Top-Up Option, which permitted Purchaser to purchase the 63,550,899 Top-Up Shares at a price per Share of $11.00. Purchaser paid for the Top-Up Shares by delivery of $635,508.99 in cash and $698,424,380.01 in a promissory note, for an aggregate price of $699,059,889.00. Purchaser ~~Financial~~was ~~Statements~~merged with and ~~Exhibits~~into Bronco on June 6, 2011 in accordance with the “short form” merger provisions available under Delaware law, which allowed the completion of the Merger without a vote or meeting of shareholders of Bronco, since Purchaser had acquired more than 90% of the outstanding Shares.

In connection with the Merger, each issued and outstanding Share (other than (i) any Shares directly owned by Chesapeake, Purchaser or any other wholly owned subsidiary of Chesapeake, (ii) Shares directly owned by Bronco or any wholly owned subsidiaries of Bronco and (iii) any Shares held by stockholders who did not consent to the Merger and who validly exercise their statutory rights of appraisal in connection with the Merger pursuant to the applicable provisions of Section 262 of the Delaware General Corporation Law) was converted into the right to receive the Offer Price. Following the consummation of the Merger, Bronco continued as the surviving corporation and an indirect wholly-owned subsidiary of Chesapeake. Assuming no appraisal rights are exercised, Chesapeake and Purchaser expect to pay approximately $42,249,185.00 in cash consideration in connection with paying the Offer Price to shareholders in the Merger who did not tender their Shares into the Offer.

On June 8, 2011, two days after the Conversion Time, in connection with the Merger, Chesapeake delivered to the Warrant holder $21,763,080, which is an amount in cash equal to the product of 5,440,770 Shares that were purchasable upon exercise of the Warrant as of the Conversion Time and the offer price of $11.00 less the $7.00 exercise price of the Warrant.

The foregoing description of the Merger Agreement and related transactions does not purport to be complete and is qualified in its entirety by reference to the full text of the Merger Agreement. A copy of the Merger Agreement, dated as of April 14, 2011, is filed as Exhibit 2.1 to this report and is incorporated herein by reference and a copy of the Amendment No. 1 to the Merger Agreement, dated as of May 17, 2011, is filed as Exhibit 2.2 to this report and is incorporated herein by reference.

Including payments made in connection with Shares validly tendered and not withdrawn in the Offer (which includes Shares tendered by notice of guaranteed delivery), the Merger and the Warrant, the total amount of the consideration payable in connection with the change of control transaction was approximately $338,563,729.00 (not including the value of the cash and promissory note components of payments for the Top-Up Shares). All amounts paid by Bronco, Chesapeake and Purchaser in connection with the Offer and the Merger were from Bronco, Chesapeake and Purchaser’s cash on hand and/or Chesapeake’s existing revolving bank credit facility, which is described in Chesapeake’s Quarterly Report on Form 10-Q filed with the SEC for the period ended March 31, 2011 and which description is incorporated herein by reference.

To the knowledge of Bronco, except as set forth herein, there are no arrangements, including any pledge by any person of securities of Bronco or Chesapeake, the operation of which may at a subsequent date result in a further change in control of Bronco.

Item 5.02.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

D. Frank Harrison, Richard B. Hefner, Dr. Gary C. Hill, David W. House and William R. Snipes voluntarily resigned from the Board of Directors of Bronco (the “Board of Directors”), effective as of the closing of the Merger. As contemplated by the Merger Agreement, effective at the closing of the Offer, Aubrey K. McClendon and Steven C. Dixon, designees of Chesapeake, became directors of Bronco. Effective at the closing of the Merger, the size of the Board of Directors was reduced from five to two, with Aubrey K. McClendon and Steven C. Dixon serving as the directors. Biographical and other information with respect to Messrs. McClendon and Dixon is included in the Section 14(f) Information Statement included as Annex I to Solicitation/Recommendation Statement on Schedule 14D-9 (together with any amendments and supplements thereto, the “Schedule 14D-9”) filed with the SEC on April 26, 2011, as amended by the Amendment No. 1 to the Schedule 14D-9 filed on May 3, 2011, Amendment No. 2 to the Schedule 14D-9 filed on May 18, 2011 and the Amendment No. 3 to the Schedule 14D-9 filed on May 31, 2011, and such information is incorporated herein by reference.

In connection with and subject to the closing of the Offer, Bronco terminated its employment agreements with Mr. Harrison, Mark Dubberstein, Matt Porter, Zachary Graves and Steven Starke. Messrs. Harrison, Dubberstein, Porter, Graves and Starke will each receive a lump sum payment consistent with the amounts provided for in their respective employment agreement as a result of the termination of their employment agreements in connection with a change in control of Bronco. The executives will receive the following lump sum payments: Mr. Harrison, $2,850,000; Mr. Dubberstein, $1,175,000; Mr. Porter, $1,506,589.13; Mr. Graves, $1,175,000; and Mr. Starke, $848,121.92, in each case these amounts are subject to applicable withholdings.

Item 5.03.

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On June 6, 2011, in connection with the Merger, the bylaws of Bronco were amended and restated (the “Amended Bylaws”) and the certificate of incorporation of Bronco was amended and restated (the “Amended Charter”), in each case, to be substantially in the form of certificate of incorporation included as Exhibit A to the Merger Agreement and the form of bylaws included as Exhibit B to the Merger Agreement, respectively.

Pursuant to the Amended Bylaws, subject to certain exceptions, generally, and among other things:

•

stockholders can act by written consent signed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted (prior to the amendments, stockholders could not act by written consent, unless approved in advance by the Board of Directors);

•

the number of directors of Bronco was set at two, which number could be fixed from time to time by the Board of Directors (prior to the amendments, there were five directors of Bronco, which number could be fixed from time to time by the Board of Directors, except that Bronco was required to have no less than 5 nor more than 9 directors);

•

directors may be removed for or without cause at any time by the affirmative vote of the holders of a majority of the voting power entitled to vote for the election of directors two (prior to the amendments, directors could only be removed for cause and then only by the affirmative vote of holders of two-thirds of the voting power generally entitled to vote in the election of directors); and

•

the Amended Bylaws may generally be altered, amended or repealed by the affirmative vote of holders of shares constituting a majority of the voting power of Bronco, and also by the Board of Directors by majority vote of those present at any meeting at which a quorum is present (prior to the amendments, Bronco’s bylaws could generally be adopted, amended, altered or repealed by affirmative vote of holders of two-thirds of the voting power generally entitled to vote in the election of directors, and also by the affirmative vote of a majority of the whole Board of Directors as if there were no vacancies).

Pursuant to the Amended Charter, subject to certain exceptions, generally, and among other things:

•

Bronco has authority to issue 1,000 shares of common stock, par value $0.01 per share (prior to the amendments, Bronco had authority to issue 100,000,000 shares of common stock, par value $0.01 per share and 1,000,000 shares of preferred stock, par value $0.01 per share).

•

The description of the Amended Bylaws and Amended Charter contained in this Item 5.03 does not purport to be complete and is subject to and qualified in its entirety by reference to the Amended Bylaws and Amended Charter, copies of which are attached hereto as Exhibit 3.1 and Exhibit 3.2, respectively, and the terms of which are incorporated herein by reference.

Item 9.01.

Financial Statements and Exhibits

(d) Exhibits

ExhibitNo.		Document Description
ExhibitNumber		Description
2.1		Agreement and Plan of Merger, dated as of April 14, 2011, by and among, ~~the~~Chesapeake ~~Company~~Energy Corporation, ~~Chesapeake~~Nomac Acquisition, Inc. and ~~Merger~~Bronco ~~Sub~~Drilling Company, Inc. (incorporated by reference to Exhibit 2.1 to the ~~Company~~Bronco’s Current Report on Form 8-K filed ~~by the Company~~ with the SEC ason of April 18, 2011).
2.2		Amendment No. 1, dated as of May 17, 2011, to the Agreement and Plan of Merger, dated as of April 14, 2011, by and among Chesapeake Energy Corporation, Nomac Acquisition, Inc., and Bronco Drilling Company, Inc. ~~dated as of May 17, 2011.~~ (incorporated by reference to Exhibit (d)(4) to ~~Amendment~~the ~~No. 3 to~~ Schedule TO filed by Chesapeake ~~and~~Energy ~~Merger~~Corporation ~~Sub~~ with the SEC ason of May 18, 2011).
99.1		Memorandum of Understanding, In re Bronco Drilling Company, Inc. Shareholder Litigation., Case No. 6398-VCP, dated May 17, 2011 (incorporated by reference to Exhibit (a)(5)(O) to Amendment No. 2 to Schedule 14D-9 filed by the Company with the SEC as of May 18, 2011).
3.1		Amended and Restated Bylaws of Bronco Drilling Company, Inc.*
99.2		Joint Press Release issued by the Company and Chesapeake dated May 18, 2011 (incorporated by reference to Exhibit (a)(5)(P) to Amendment No. 3 to Schedule TO filed by Chesapeake and Merger Sub with the SEC as of May 18, 2011).
3.2		Restated Certificate of Incorporation of Bronco Drilling Company, Inc.*
99.1		Press Release issued on June 6, 2011 by Chesapeake Energy Company Announcing Offer Expiration (incorporated by reference to Exhibit (a)(5)(6) to the Schedule TO filed by Chesapeake Energy Corporation with the SEC on June 6, 2011).

*	Filed herewith

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the ~~Company~~registrant has duly caused this report to be signed on its behalf by the undersigned ~~thereunto~~hereunto duly authorized.

	~~BRONCO DRILLING COMPANY, INC.~~	BRONCO DRILLING COMPANY, INC.
Date: May 23, 2011	By:	/s/ Matthew S. Porter
Dated: June 9, 2011		By:	/s/ Jennifer M. Grigsby
		Matthew S. Porter
		Name:	Jennifer M. Grigsby
		Chief Financial Officer
		Title:	Senior Vice President, Treasurer
			and Corporate Secretary

[Bronco Drilling Company, Inc. Form 8-K]

EXHIBIT INDEX


Exhibit Number		Description

2.1		Agreement and Plan of Merger, dated as of April 14, 2011, by and among, Chesapeake Energy Corporation, Nomac Acquisition, Inc. and Bronco Drilling Company, Inc. (incorporated by reference to Exhibit 2.1 to the Bronco’s Current Report on Form 8-K filed with the SEC on April 18, 2011).

2.2		Amendment No. 1, dated as of May 17, 2011, to the Agreement and Plan of Merger, dated as of April 14, 2011, by and among Chesapeake Energy Corporation, Nomac Acquisition, Inc. and Bronco Drilling Company, Inc. (incorporated by reference to Exhibit (d)(4) to the Schedule TO filed by Chesapeake Energy Corporation with the SEC on May 18, 2011).

3.1		Amended and Restated Bylaws of Bronco Drilling Company, Inc.

3.2		Restated Certificate of Incorporation of Bronco Drilling Company, Inc.

99.1		Press Release issued on June 6, 2011 by Chesapeake Energy Company Announcing Offer Expiration (incorporated by reference to Exhibit (a)(5)(6) to the Schedule TO filed by Chesapeake Energy Corporation with the SEC on June 6, 2011).

Filing Compare · Bronco Drilling Company, Inc.