Document:

exv10w7

Exhibit 10.7

AMENDMENT NO. 16

TO THE

ENSCO SAVINGS PLAN

(As Revised and Restated Effective January 1, 1997)

     THIS AMENDMENT NO. 16, executed this 22nd day of December, 2009 by Ensco International
Incorporated, having its principal office in Dallas, Texas (hereinafter referred to as the
“Company”), and effective as of December 23, 2009 (or, if different, the effective date of the
merger between the Company and Ensco Newcastle LLC).

WITNESSETH:

     WHEREAS, the Company revised and restated the Ensco Savings Plan (the “Plan”), effective
January 1, 1997, except for certain provisions for which another effective date was subsequently
provided elsewhere in the terms of the Plan, to (i) incorporate the prior amendments to the Plan,
(ii) incorporate such other provisions as were necessary due to the merger of the Penrod Thrift
Plan and the Dual 401(k) Plan into the Plan, (iii) clarify the definition of “annual compensation”
used for nondiscrimination testing under Sections 401(k) and 401(m) of the Code, and (iv) bring the
Plan into compliance with the Internal Revenue Code of 1986, as amended (the “Code”), as modified
by the Small Business Job Protection Act of 1996, the General Agreement on Tariffs and Trade under
the Uruguay Round Agreements Act, the Uniformed Services Employment and Reemployment Rights Act of
1994, the Taxpayer Relief Act of 1997, the Internal Revenue Service Restructuring and Reform Act of
1998, and the Community Renewal Tax Relief Act of 2000, as well as all applicable rules,
regulations and administrative pronouncements enacted, promulgated or issued since the date the
Plan was last restated;

     WHEREAS, the Company adopted Amendment No. 1 to the revised and restated Plan, effective
January 1, 2002, to reflect the proposed Treasury regulations (the “Proposed Regulations”) issued
under Section 401(a)(9) of Code;

     WHEREAS, the Company adopted Amendment No. 2 to the revised and restated Plan, effective as of
January 1, 2002, except as specifically otherwise in Amendment No. 2, to (i) reflect certain
provisions of the Economic Growth and Tax Relief Reconciliation Act of 2001 (“EGTRRA”) which
generally became applicable to the Plan effective as of January 1, 2002, and (ii) constitute good
faith compliance with the requirements of EGTRRA;

     WHEREAS, the Pension and Welfare Benefits Administration of the Department of Labor issued
final regulations establishing new standards for processing benefit claims of participants and
beneficiaries under Section 15.6 of the Plan which have been clarified by further guidance from the
Pension and Welfare Benefits Administration (collectively the “Final Claims Procedure
Regulations”);

     WHEREAS, the Proposed Regulations for which the revised and restated Plan was amended by
Amendment No. 1 were replaced by final Treasury regulations that were issued

 

 

April 17, 2002 under Section 401(a)(9) of the Code relating to required minimum distributions
under Section 15.4 of the Plan (the “Final Required Minimum Distribution Regulations”);

     WHEREAS, the Company acquired Chiles Offshore Inc. (“Chiles”), effective August 7, 2002,
pursuant to a merger agreement among the Company, Chore Acquisition, Inc. (“Chore”), a wholly-owned
subsidiary of the Company, and Chiles, whereby Chiles was merged with and into Chore, with Chore
being the surviving company and continuing to exist as a wholly-owned subsidiary of the Company and
the successor sponsor to Chiles of the Chiles Offshore Inc. 401(k) Retirement Savings Plan (the
“Chiles 401(k) Plan”);

     WHEREAS, the employees of Chiles that continued as employees of a subsidiary of the Company on
and after August 7, 2002 continued to be eligible to participate in the Chiles 401(k) Plan through
September 30, 2002 and then became eligible to participate in the Plan effective October 1, 2002;

     WHEREAS, the Chiles 401(k) Plan was merged into the Plan effective October 1, 2002 and the
assets of the Chiles 401(k) Plan were transferred on October 1, 2002 from the trust established
pursuant to the Chiles 401(k) Plan to the trust established pursuant to the Plan;

     WHEREAS, the Company adopted Amendment No. 3 to the revised and restated Plan, effective as of
October 1, 2002, unless specifically provided otherwise in Amendment No. 3, to, among other things,
(i) revise Section 15.6 of the Plan to provide that the administrator of the Plan shall process
benefit claims of participants and beneficiaries pursuant to the claims procedure specified in the
summary plan description for the Plan which shall comply with the Final Claims Procedure
Regulations, as may be amended from time to time, (ii) reflect the Final Required Minimum
Distribution Regulations by amending Section 15.4 of the Plan consistent with the Model Amendment
provided by the Internal Revenue Service in Rev. Proc. 2002-29, (iii) permit participation in the
Plan on October 1, 2002 (the “Date of Participation”) by all employees of Chiles who are both
eligible to participate in the Chiles 401(k) Plan as of September 30, 2002 and are employed by the
Company or a subsidiary of the Company on October 1, 2002, (iv) provide all employees of Chiles who
begin to participate in the Plan as of the Date of Participation with credit for all actual service
with Chiles for purposes of the eligibility and vesting provisions of the Plan, (v) provide that
any participant in the Chiles 401(k) Plan who has credit under the Chiles 401(k) Plan for at least
three years of vesting service as of the Date of Participation shall continue to vest under the
Plan in his account balance in the Plan pursuant to the vesting schedule contained in the Chiles
401(k) Plan, (vi) provide that any participant in the Chiles 401(k) Plan who has credit under the
Chiles 401(k) Plan for two years of vesting service as of the Date of Participation shall remain
40% vested in his account balance in the Plan but, subsequent to the Date of Participation, shall
continue to vest in his account balance in the Plan pursuant to the vesting schedule of the Plan,
(vii) provide that any participant in the Chiles 401(k) Plan who has credit under the Chiles 401(k)
Plan for one year of vesting service as of the Date of Participation shall remain 20% vested in his
account balance in the Plan but, subsequent to the Date of Participation, shall continue to vest in
his account balance in the Plan pursuant to the vesting schedule of the Plan, (viii) provide that
any participant in the Chiles 401(k) Plan as of the Date of Participation shall become fully vested
in his account balance in the Plan as of the date he has both attained age 55 and received credit
under the Plan for at least five years of vesting service, and (ix) provide that any participant in
the Chiles 401(k) Plan as of the

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Date of Participation shall be eligible for an in-service withdrawal from the Plan under
Section 15.5(c) of the Plan once every six months after he has attained 591/2;

     WHEREAS, the Company adopted Amendment No. 4 to the revised and restated Plan to retroactively
amend the definition of Profit Sharing Entry Date in Section 1.16 of the Plan to conform the terms
of Section 1.16 of the Plan to the actual operation of the Plan as authorized by Section 2.07(3) of
Appendix B to Rev. Proc. 2002-47;

     WHEREAS, the Company adopted Amendment No. 5 to the revised and restated Plan to (i) reduce
the service requirement to become eligible to participate in the 401(k) feature of the Plan, (ii)
revise the requirements for an election to participate in the 401(k) feature of the Plan and for
subsequent amendments to a salary reduction agreement, and (iii) increase the maximum deferral
percentage that may be elected under a salary reduction agreement;

     WHEREAS, EGTRRA amended Section 401(a)(31)(B) of the Code to require that mandatory
distributions of more than $1,000 from the Plan be paid in a direct rollover to an individual
retirement plan as defined in Sections 408(a) and (b) of the Code if the distributee does not make
an affirmative election to have the amount paid in a direct rollover to an eligible retirement plan
or to receive the distribution directly and I.R.S. Notice 2005-5 provides that this provision
becomes effective to the Plan for distributions on or after March 28, 2005;

     WHEREAS, the Company adopted Amendment No. 6 to the revised and restated Plan (i) effective as
of September 1, 2005, to increase the normal retirement age under the Plan from age 60 to age 65,
and (ii) effective as of March 28, 2005, to comply with the provisions of Section 401(a)(31)(B) of
the Code, as amended by EGTRRA and the guidance issued in I.R.S. Notice 2005-5 relating to the
application of the new rules in connection with automatic rollovers of certain mandatory
distributions;

     WHEREAS, the Katrina Emergency Tax Relief Act of 2005 (“KETRA”) amended the Code to
immediately authorize tax-favored withdrawals and special provisions for loans from qualified
retirement plans to provide relief relating to Hurricane Katrina;

     WHEREAS, the Company adopted Amendment No. 7 to the revised and restated Plan, effective as of
October 3, 2005, to provide temporary relief to certain participants and related individuals
affected by Hurricane Katrina in the form of (i) hardship withdrawals from the Plan, and (ii)
modified loan provisions for certain loans from the Plan;

     WHEREAS, the Gulf Opportunity Zone Act of 2005 amended the Code to expand the
hurricane-related relief provided under KETRA to victims of Hurricane Rita and Hurricane Wilma;

     WHEREAS, the Company adopted Amendment No. 8 to the revised and restated Plan to provide
temporary relief to certain participants and related individuals affected by Hurricane Rita and/or
Hurricane Wilma in the form of (i) hardship withdrawals from the Plan, and (ii) modified loan
provisions for certain loans from the Plan;

     WHEREAS, the Company adopted Amendment No. 9 to the revised and restated Plan, effective
January 1, 2007, to reduce the service requirement to become eligible to participate in

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the profit sharing feature of the Plan with respect to employees who are employed or
reemployed after December 31, 2006;

     WHEREAS, the Department of Treasury issued final regulations under Sections 401(k) and 401(m)
of the Code which generally became applicable to the Plan effective as of January 1, 2006
(collectively the “Final 401(k)/401(m) Regulations”);

     WHEREAS, the Company adopted Amendment No. 10 to the revised and restated Plan (i) effective
as of January 1 2006, to reflect the Final 401(k)/401(m) Regulations and to constitute good faith
compliance with the Final 401(k)/(m) Regulations and (ii) effective as of January 1, 2007, to
exclude Carl F. Thorne from further participation in the profit sharing feature of the Plan;

     WHEREAS, the Company adopted Amendment No. 11 to the revised and restated Plan, effective
January 1, 2008, to (i) clarify that certain highly compensated employees are not permitted to
amend their salary reduction contribution elections for a year during the year, and (ii) amend the
vesting schedule in Section 14.2 of the Plan;

     WHEREAS, the Pension Protection Act of 2006 requires participant-directed individual account
plans to provide quarterly benefit statements to the plans’ participants providing certain specific
information;

     WHEREAS, the Department of Labor issued final regulations relating to qualified default
investment alternatives in participant-directed individual account plans which may become
applicable to a plan effective on or after December 24, 2007 (the “Qualified Default Investment
Alternatives Regulations”);

     WHEREAS, the Company adopted Amendment No. 12 to the revised and restated Plan, to (i) amend,
effective as of January 1, 2008, the investment funds specified in Section 1.24 of the Plan
available for participant direction of investment, (ii) amend, effective June 1, 2008, Section 1.24
and Section 22.8 of the Plan to provide a limitation on the portion of a participant’s individual
account that may be invested in Fund 5, (iii) amend, effective June 1, 2008, Section 3.1 of the
Plan to provide for automatic enrollments, (iv) amend, effective as of January 1, 2007, Section
10.2 and Section 22.8 of the Plan to comply with the quarterly benefit statement requirements of
the Pension Protection Act of 2006, (v) amend, effective June 1, 2008, Section 15.11 of the Plan to
provide for eligible rollover distributions by non-spousal beneficiaries as permitted by the
Pension Protection Act of 2006, and (vi) amend, effective June 1, 2008, Section 22.8 and Section
22.10 of the Plan to change the default investment fund and to specify related procedures in
compliance with the Qualified Default Investment Alternatives Regulations governing the investment
of the individual account of new participants with an employment or re-employment commencement date
after May 31, 2008 who fail to affirmatively direct the investment of their individual accounts;

     WHEREAS, the Company adopted Amendment No. 13 to the revised and restated Plan, to (i) amend,
effective as of February 1, 2009, the investment funds specified in Section 1.24 of the Plan
available for participant direction of investment, (ii) amend, effective January 1, 2009, except as
otherwise specifically provided therein to the contrary, Article II and

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Section 3.1(b)(iv) of the Plan to provide for the exclusion from initial or continued eligibility to participate
in the Plan of all employees of the Company and Affiliated Companies who become or may subsequently
become eligible to participate in the Ensco Multinational Savings Plan on or after January 1, 2009,
or would otherwise become or subsequently become eligible to participate in the Ensco Multinational
Savings Plan on or after January 1, 2009 but for the fact that any such employee is not working
outside the country of the employee’s permanent residence, (iii) amend, effective January 1, 2008,
Section 3.2 of the Plan to provide that an employer shall make additional matching contributions as
of the last day of any plan year, commencing with the plan year ending December 31, 2008, to the
extent the Plan administrator determines that a participant did not receive the same amount of
matching contributions to which the participant was entitled for that plan year based on his salary
reduction contributions and his annual compensation for that plan year, and (iv) amend, effective
January 1, 2008, Section 7.4 of the Plan to provide for the exclusion of all participants and
employees of the Company and Affiliated Companies who become or may subsequently become eligible to
participate in the Ensco Multinational Savings Plan on or after January 1, 2009, or would otherwise
become or subsequently become eligible to participate in the Ensco Multinational Savings Plan on or
after January 1, 2009 but for the fact that any such employee is not working outside the country of
the employee’s permanent residence, from initial or continued eligibility to share in the
allocation of any profit sharing contribution (as well as the forfeitures, if any, that may become
allocable under Section 7.4 along with such profit sharing contributions) that may be made to the
Plan under Section 3.3 for any plan year beginning on or after January 1, 2008;

     WHEREAS, final Treasury regulations were issued under Section 415 of the Code which became
effective to the Plan as of January 1, 2008 (the “Final 415 Regulations”);

     WHEREAS, the Company adopted Amendment No. 14 to the revised and restated Plan, to (i) amend,
effective January 1, 2008, Article VIII of the Plan to reflect the Final 415 Regulations, and (ii)
amend, effective October 1, 2009, Section 22.8 of the Plan to reduce the increments by which
participants can select investment funds from ten percent to the lowest increment determined from
time to time by the administrator of the Plan and to reduce the limitation on the portion of a
participant’s individual account that may be invested in Fund 5;

     WHEREAS, the Company adopted Amendment No. 15 to the revised and restated Plan, to (i) amend,
effective January 1, 2008, Section 4.1 of the Plan to reflect the change made to the Code by the
provisions of the Worker, Retiree, and Employer Recovery Act of 2008 which provide that the
correction of excess elective deferrals by distribution for taxable years beginning after December
31, 2007 shall not require the distribution of gap period income, i.e., earnings attributable to
such distributed amounts after the end of the taxable year through the date prior to the date of
distribution, (ii) amend Sections 4.3 and 5.2 of the Plan, as amended, to reflect the provisions of
the Pension Protection Act of 2006 which provide that the correction of excess salary reduction
contributions and excess matching contributions by distribution for plan years beginning after
December 31, 2007 shall not require the distribution of gap period income, i.e., earnings
attributable to such distributed amounts after the end of the plan year through the date prior to
the date of distribution, and (iii) amend, effective for distributions after December 31, 2006,
Section 15.2 of the Plan, as amended, to reflect the provisions of the Pension Protection Act of
2006 which specify the content and timing requirements for notices required to be provided to
participants regarding their distribution election rights under the Plan;

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     WHEREAS, the board of directors of the Company and the stockholders of the Company have
approved the adoption of the Agreement and Plan of Merger and Reorganization (the “Merger
Agreement”) by and between the Company and ENSCO Newcastle LLC, a newly formed Delaware limited
liability company (“Ensco Mergeco”) and a wholly-owned subsidiary of ENSCO Global Limited, a newly
formed Cayman Islands exempted company (“Ensco Cayman”) and a wholly-owned subsidiary of the
Company, pursuant to which Ensco Mergeco will merge (the “Merger”) with and into the Company, with
the Company surviving the Merger as a wholly-owned subsidiary of Ensco Cayman;

     WHEREAS, Ensco Cayman will become, in connection with the Merger, a wholly-owned subsidiary of
ENSCO International Limited, a newly formed private limited company incorporated under English law
which, prior to the effective time of the Merger, will re-register as a public limited company
named “Ensco International plc” (“Ensco UK”);

     WHEREAS, pursuant to the Merger Agreement, each issued and outstanding share of the common
stock of the Company will be converted into the right to receive one American depositary share
(each an “ADS” and collectively, the “ADSs”), which represents one Class A ordinary share of Ensco
UK and is evidenced by an American depositary receipt; and

     WHEREAS, the Company now desires to adopt this Amendment No. 16 to the revised and restated
Plan to amend, effective as of December 23, 2009 (or, if different, the effective date of the
Merger), (i) Section 1.10 of the Plan to define “Ensco ADS” instead of “Company Stock,” (ii)
Section 1.14 of the Plan to prohibit any Affiliated Company that is a UK or English company from
becoming an Employer under the Plan, (iii) the fund listed as Fund 5 in Section 1.24 of the Plan to
mean the Ensco ADS Fund, (iv) Section 21.6 of the Plan to reflect the voting rights and procedures
in connection with the ADSs and the underlying Shares (as defined in such section), (v) Section
21.7 of the Plan to reflect certain concepts under English law related to offers as described in
such section, (vi) Section 22.10 of the Plan to specifically provide that each share of Common
Stock held by the Trust Fund on the effective date of the Merger was converted into one ADS,
pursuant to the Merger Agreement, and (vii) to make such other conforming changes to the Plan as
determined necessary;

     NOW, THEREFORE, in consideration of the premises and the covenants herein contained, the
Company hereby adopts the following Amendment No. 16 to the Plan:

     1. Section 1.10 of the Plan is hereby amended to read as follows:

     Sec. 1.10 Ensco ADS means an American depository share, evidenced by an American
depositary receipt, which represents a Class A ordinary share in Ensco International plc, a company
incorporated under English law which wholly owns the Company. Except with respect to the Section
21.6, Section 21.7 and the second paragraph of Section 22.10, references (specific or otherwise) to
shares of Company Stock in the Plan, as amended, shall be read and considered to be references to
Ensco ADSs and all references (specific or otherwise) to “stockholders of the Company” shall be
read and considered to be references to holders of Ensco ADSs, and all provisions of the Plan shall
be consistently interpreted and applied.

     2. Section 1.14 of the Plan is hereby amended to read as follows:

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     Sec. 1.14 Employer means the Company and any other Affiliated Company, with respect to
its Employees, provided such Affiliated Company is designated by the governing body of the Company
as an Employer under the Plan and whose designation as such has become effective and has continued
in effect; provided, however, that no Affiliated Company that is either a UK company or an English
company shall become an Employer. The designation shall become effective only when it shall have
been accepted by the governing body of the Employer. An Employer may revoke its acceptance of such
designation at any time, but until such acceptance has been revoked, all of the provisions of the
Plan and amendments thereto shall apply to the Employees of the Employer. In the event the
designation of the Employer as such is revoked by the governing body of the Employer, such
revocation will not be deemed a termination of the Plan.

     3. The fund designated in Section 1.24 of the Plan as Fund 5 is hereby amended by changing the
name of the fund designated as Fund 5 in Section 1.24 of the Plan from “Company Stock Fund” to
“Ensco ADS Fund.”

     4. Subparagraphs (ii) and (iii) of the first paragraph of Section 8.2(f) of the Plan, as
amended, are hereby amended to read as follows:

(ii) amounts realized under Section 83 of the Code from the exercise of a
non-qualified share option [which is an option other than a statutory option defined
in Treas. Reg. §1.421-1(b)], or when restricted shares (or property) held by an
Employee either become freely transferable or are no longer subject to a substantial
risk of forfeiture within the meaning of Section 83 of the Code;

(iii) amounts realized from the sale, exchange or other disposition of shares
acquired under a statutory share option [as defined in Treas. Reg. §1.421-1(b)]; and

     5. The reference to “stockholders” in Section 19.1 of the Plan is hereby changed to
“shareholders.”

     6. Section 21.6 of the Plan is hereby amended to read as follows:

     Sec. 21.6 Voting of Ensco ADSs. The Trustee shall, upon receipt of notice to it of
any meeting at which the holders of the Class A ordinary shares in Ensco International plc (the
“Shares”) are entitled to vote, promptly send (or cause a third party to send, at the expense of
the Company) each Participant and Former Participant a copy of the proxy solicitation materials,
together with a form requesting confidential voting instructions to the Trustee regarding the Ensco
ADSs allocated to his Individual Account. Each Participant and Former Participant shall be
entitled to direct the Trustee as to the manner in which the Trustee is to instruct the depositary
for the Ensco ADSs (the “Depositary”) to vote (or, if applicable, cause the custodian appointed by
the Depositary (the “Custodian”) to vote) all Ensco ADSs (including fractional ADSs) allocated to
his Individual Account, provided he delivers instructions to the Trustee directing it how to
instruct the Depositary (or the Custodian, if applicable) to vote Ensco ADSs at least five business
days prior to the date such vote shall be required (or such other period of time as may be required
by the Trustee). In the event a Participant or Former Participant delivers conflicting

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instructions, the instructions delivered last in time shall control. In the event a Participant or
Former Participant fails to deliver such instructions, the Trustee shall instruct the Depositary to
vote, or cause the Custodian to vote, such Ensco ADSs proportionately to the ratio of the votes of
the Participants and Former Participants who have delivered voting instructions to the Trustee.
Voting instructions may be given only in respect of a number of Ensco ADSs representing an integral
number of the Shares. All instructions shall be maintained by the Trustee to safeguard the
confidentiality of the instructions.

     7. Section 21.7 of the Plan is hereby amended to read as follows:

     Sec. 21.7 Tender and Exchange Offers. The provisions of this section 21.7 shall apply
in the event that a tender offer (as defined below) is made for the Ensco ADSs or underlying Shares
or an offer to exchange securities (as defined below) for the Ensco ADSs (or the Shares) which are
subject to the U.S. Securities Act of 1933, as amended, is made.

(a) Definitions. A tender offer and an exchange offer or offer to exchange shall
have the meanings set forth below:

(i) an offer that is subject to Section 14(d)(1) of the U.S. Securities Exchange Act
of 1934, as amended; and

(ii) a “takeover offer” as defined in Section 974 of the UK Companies Act 2006 and
if, at the relevant time, the Company is subject to the UK City Code on Takeovers
and Mergers, an “offer” (as defined therein).

(b) Notice and Directions. Upon such a tender or exchange offer occurring, the
Company and the Trustee shall utilize their best efforts to notify each affected Participant
and Former Participant and to cause to be distributed to him such information as will be
distributed to the holders of the Ensco ADSs or the Shares, whichever shall apply, generally
in connection with any such tender or exchange offer and a form by which the Participant or
Former Participant may direct the Trustee in writing as to what action, as set forth below,
to take on behalf of that Participant or Former Participant with respect to the Ensco ADSs
allocated to his Individual Account under the Plan or, if applicable, the Shares represented
by such Ensco ADSs. If the Trustee does not receive such written directions from a
Participant or Former Participant, the Trustee shall not tender or deliver in acceptance of
the exchange offer any of the Ensco ADSs (or surrender the Ensco ADSs in connection with a
tender or exchange offer over the Shares) held in that Participant’s or Former Participant’s
Individual Account.

(c) Cash Tender Offer — Ensco ADSs. In connection with a cash tender offer for
Ensco ADSs, a Participant or Former Participant may direct the Trustee to tender any or all
Ensco ADSs held in the Participant’s or Former Participant’s Individual Account. Any cash
received by the Trustee as a result of such tender shall be invested by the Trustee in such
short-term interest bearing investments as it deems appropriate pending direction from
Participants and Former Participants regarding the reinvestment of such cash in the
Investment Funds then available under the Plan.

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(d) Exchange Offer — Ensco ADSs. In connection with an exchange offer for Ensco
ADSs, a Participant or Former Participant may direct the Trustee to deliver in acceptance of
the exchange offer any or all Ensco ADSs held in the Participant’s or Former Participant’s
Individual Account. Any property received by the Trustee in connection with such exchange
shall be held by the Trustee in separate accounts for the affected Participants and Former
Participants pending directions from them regarding the reinvestment of such property in the
Investment Funds that are available under the Plan.

(e) Tender and Exchange Offer — Ensco ADSs. In connection with a combination
tender and exchange offer for Ensco ADSs, a Participant or Former Participant may direct the
Trustee to tender and deliver in acceptance of the exchange offer any or all Ensco ADSs held
in the Participant’s or Former Participant’s Individual Account with any cash received by
the Trustee as a result of such tender treated as provided in subsection (c) above and any
property received by the Trustee in connection with the exchange treated as provided in
subsection (d) above.

(f) Cash Tender Offer — Shares. In connection with a cash tender offer for Shares,
a Participant or Former Participant may direct the Trustee to surrender to the Depositary
any or all Ensco ADSs held in the Participant’s or Former Participant’s Individual Account
and withdraw the Shares and then deliver the Shares in acceptance of the tender offer. Any
cash received by the Trustee as a result of such tender shall be invested as provided in
subsection (c) above.

(g) Exchange Offer — Shares. In connection with an exchange offer for Shares, a
Participant or Former Participant may direct the Trustee to surrender to the Depositary any
or all Ensco ADSs held in the Participant’s or Former Participant’s Individual Account and
withdraw the Shares, and then deliver the Shares in acceptance of the exchange offer. Any
property received by the Trustee in connection with such exchange shall be held by the
Trustee as provided in subsection (d) above.

(h) Tender and Exchange Offer — Shares. In connection with a combination tender
and exchange offer for Shares, a Participant or Former Participant may direct the Trustee to
surrender to the Depositary any or all Ensco ADSs held in the Participant’s or Former
Participant’s Individual Account and withdraw the Shares, and tender and deliver the Shares
in acceptance of the exchange offer. Any cash received by the Trustee as a result of such
tender shall be invested as provided in subsection (c) above and any property received by
the Trustee in connection with the exchange shall be held by the Trustee as provided in
subsection (d) above.

(i) Revocation of Directions. A tender or exchange offer direction given by a
Participant or Former Participant may be revoked by the Participant or Former Participant by
completion of the form prescribed therefor by the Administrator, provided such form is filed
with the Trustee at least two business days prior to the withdrawal-date-deadlines provided
for in the regulations with respect to tender or exchange offers prescribed by the
Securities and Exchange Commission or other applicable law.

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(j) Best Efforts. The Trustee shall use its best efforts to effect on a uniform and
nondiscriminatory basis the sale or exchange of the Ensco ADSs or the Shares, as applicable,
as directed by the Participants and Former Participants. However, neither the Administrator,
the Committee nor the Trustee insures that all or any part of the Ensco ADSs or the Shares
directed by a Participant or Former Participant to be tendered or exchanged will be accepted
under the tender or exchange offer. Any such Ensco ADSs (including the Ensco ADSs related to
a tender or exchange offer for the Shares) not so accepted shall remain in the Participant’s
or Former Participant’s Individual Account and the Participant or Former Participant shall
continue to have the same rights with respect to such Ensco ADSs as he had immediately prior
to the Trustee’s tendering of the Ensco ADSs or the Shares.

(k) Conditional Obligations of the Trustee. Any obligation belonging to the Trustee
under the foregoing provisions of this Section 21.7 is conditional upon the tender offer or
exchange offer:

(i) not conflicting with, constituting a breach of, or contravening any law,
regulation, directive, judgment or order of any legislative, governmental or
supervisory body of the United Kingdom or the European Union; and

(ii) being carried out in compliance with any requirement to file a prospectus or
other filing with, or obtain prior consent, approval, authorization from, or a
license, order, registration, qualification or decree of any court or governmental
authority or agency or supervisory body.

     If the conditions above are not met, the Trustee will not be required to perform such
obligation.

     If a tender or exchange offer is made, the Administrator shall adopt such rules, prescribe the
use of such special administrative forms and procedures, delegate such authority, take such action
and execute such instruments or documents and do every other act or thing as shall be necessary or
in its judgment proper for the implementation of this Section 21.7. All instructions from
Participants and Former Participants regarding a tender or exchange offer shall be maintained by
the Trustee to safeguard the confidentiality of the instructions.

     Notwithstanding anything in the Plan to the contrary, in administering the tendering or
exchange of Ensco ADSs or Shares pursuant to the applicable provisions of the Plan, it is intended
that the confidentiality of the tenders or exchanges, as the case may be, made by Participants or
Former Participants pursuant to the provisions of the Plan shall be maintained by the Trustee as
may be contemplated by applicable law.

     8. Section 22.10 of the Plan is hereby amended by adding the following new paragraph to the
end thereof to read as follows:

     The stockholders of the Company approved and adopted at the Special Meeting of Stockholders on
December 22, 2009 the Agreement and Plan of Merger and Reorganization (the “Merger Agreement”) by
and between the Company and ENSCO Newcastle LLC, a newly

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formed Delaware limited liability company (“Ensco Mergeco”) and a wholly-owned subsidiary of
ENSCO Global Limited, a newly formed Cayman Islands exempted company (“Ensco Cayman”) and a
wholly-owned subsidiary of the Company, pursuant to which Ensco Mergeco merged (the “Merger”) with
and into the Company, with the Company surviving the Merger as a wholly-owned subsidiary of Ensco
Cayman. Ensco Cayman became, in connection with the Merger, a wholly-owned subsidiary of ENSCO
International Limited, a newly formed private limited company incorporated under English law which,
prior to the effective time of the Merger, re-registered as a public limited company named “Ensco
International plc.” Pursuant to the Merger Agreement, each share of Company Stock held by the
Trust Fund on the effective date of the Merger, including each such share allocated to the
Individual Accounts of each Participant, was converted into one Ensco ADS.

     IN WITNESS WHEREOF, the Company, acting by and through its duly authorized officers, has
caused this Amendment No. 16 to be executed on the date first above written.

	 	 	 	 	 
	 	ENSCO INTERNATIONAL INCORPORATED

 	 
	 	By:  	/s/ Cary A. Moomjian, Jr.
 	 
	 	 	Cary A. Moomjian, Jr., 	 
	 	 	Vice President 	 
	 

-11-exv10w8

Exhibit 10.8

AMENDMENT NO. 3 TO THE

ENSCO 2005 SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

(As Amended and Restated Effective January 1, 2005)

     THIS AMENDMENT No. 3, executed this 22nd day of December, 2009 by Ensco
International Incorporated, having its principal office in Dallas, Texas (hereinafter referred to
as the “Company”), and effective as of December 23, 2009 (or, if different, the effective date of
the merger between the Company and Ensco Newcastle LLC).

WITNESSETH:

     WHEREAS, effective April 1, 1995, Energy Service Company, Inc. adopted the Energy Service
Company, Inc. Select Executive Retirement Plan (the “Original SERP”);

     WHEREAS, the name of the Company was changed to ENSCO International Incorporated;

     WHEREAS, the Company amended and restated the Original SERP, effective January 1, 1997, to (i)
provide a discretionary profit sharing contribution, (ii) rename the Original SERP the “ENSCO
Supplemental Executive Retirement Plan,” and (iii) coordinate the operation of the Original SERP
with the ENSCO Savings Plan;

     WHEREAS, the Pension and Welfare Benefits Administration of the Department of Labor issued
final regulations establishing new standards for processing benefit claims of participants and
beneficiaries under Section 8.2 of the Original SERP which were subsequently clarified by further
guidance from the Pension and Welfare Benefits Administration (collectively the “Final Claims
Procedure Regulations”);

     WHEREAS, the Company adopted Amendment No. 1 to the amended and restated Original SERP,
effective as of January 1, 2002, to revise Section 8.2 of the Original SERP to provide that the
administrator of the Original SERP shall process benefit claims of participants and beneficiaries
pursuant to the claims procedure specified in the summary plan description for the Original SERP
which shall comply with the Final Claims Procedure Regulations, as may be amended from time to
time;

     WHEREAS, the Company amended and restated the Original SERP, effective as of January 1, 2004;

     WHEREAS, the American Jobs Creation Act of 2004 (the “AJCA”) enacted new section 409A of the
Internal Revenue Code of 1986, as amended (the “Code”), which imposes new rules regarding the
timing of elections and distributions under nonqualified deferred compensation plans effective for
years beginning after December 31, 2004;

     WHEREAS, the Company determined to comply with the AJCA and new section 409A of the Code by
freezing the Original SERP and adopting the ENSCO 2005 Supplemental Executive Retirement Plan (the
“2005 SERP”), effective January 1, 2005;

     WHEREAS, the Board of Directors of the Company (the “Board”), upon recommendation of its
Nominating, Governance and Compensation Committee (the

 

 

“Committee”), approved Amendment No. 1 to the 2005 SERP during a regular meeting held on
November 6, 2007;

     WHEREAS, the Board, upon recommendation of the Committee, approved Amendment No. 2 to the 2005
SERP during a regular meeting held on March 10, 2008;

     WHEREAS, the Board, upon recommendation of the Committee during its meeting held on November
3-4, 2008, approved the amendment and restatement of the 2005 SERP during a regular meeting held on
November 4, 2008;

     WHEREAS, the Company adopted the amended and restated 2005 SERP, effective as of January 1,
2005, except as specifically provided otherwise to the contrary therein, in order to (i) facilitate
compliance with the final Treasury regulations under section 409A of the Code, and (ii) incorporate
the amendments to the 2005 SERP previously made by Amendment No. 1 and Amendment No. 2;

     WHEREAS, the Board, upon recommendation of the Committee during its regular meeting held on
August 4, 2009, approved Amendment No. 1 to the 2005 SERP, as amended and restated effective
January 1, 2005, during a regular meeting held on August 4, 2009;

     WHEREAS, the Board, upon recommendation of the Committee during its regular meeting held on
November 2, 2009, approved Amendment No. 2 to the 2005 SERP, as amended and restated effective
January 1, 2005, during a regular meeting held on November 3, 2009;

     WHEREAS, the Board and the stockholders of the Company have approved the adoption of the
Agreement and Plan of Merger and Reorganization (the “Merger Agreement”), by and between the
Company and ENSCO Newcastle LLC, a newly formed Delaware limited liability company (“Ensco
Mergeco”) and a wholly-owned subsidiary of ENSCO Global Limited, a newly formed Cayman Islands
exempted company (“Ensco Cayman”) and a wholly-owned subsidiary of the Company, pursuant to which
Ensco Mergeco will merge (the “Merger”) with and into the Company, with the Company surviving the
Merger as a wholly-owned subsidiary of Ensco Cayman (the “Reorganization”);

     WHEREAS, Ensco Cayman will become, in connection with the Merger, a wholly-owned subsidiary of
ENSCO International Limited, a newly formed private limited company incorporated under English law
which, prior to the effective time of the Merger, will re-register as a public limited company
named “Ensco International plc” (“Ensco UK”);

     WHEREAS, pursuant to the Merger Agreement, each issued and outstanding share of the common
stock of the Company will be converted into the right to receive one American depositary share,
which represents one Class A ordinary share of Ensco UK and is evidenced by an American depositary
receipt;

2

 

     WHEREAS, the Board by its unanimous written consent has approved this Amendment No. 3 to the
amended and restated 2005 SERP to be effective as of December 23, 2009 (or, if different, the
effective date of the Merger); and

     WHEREAS, the Company now desires to adopt this Amendment No. 3 to the amended and restated
2005 SERP in order to (i) affirmatively provide that (A) the Company does not intend for the
Reorganization to constitute a “Change in Control” of the Company under Section 10.2 of the amended
and restated 2005 SERP, and (B) the amended and restated 2005 SERP shall continue notwithstanding
the Reorganization as if the Reorganization does not constitute a Change in Control of the Company,
(ii) specifically provide that (A) each share of common stock of the Company held by the Company
stock fund on the effective date of the Merger was converted into one Ensco ADS pursuant to the
Merger Agreement, and (B) the references to “Company stock fund” in Section 7.2 of the amended and
restated 2005 SERP shall thereafter be read and considered to be references to the “Ensco ADS
fund,” and (iii) make such other conforming changes to the amended and restated 2005 SERP as
determined necessary;

     NOW, THEREFORE, in consideration of the premises and the covenants herein contained, the
Company hereby adopts the following Amendment No. 3 to the amended and restated 2005 SERP:

     1. The third paragraph of Section 10.2 of the 2005 SERP is hereby amended to read as follows
following the effective date of the Merger:

     For purposes of this Plan, a Change in Control of the Company shall be deemed to occur if
there is a change (i) in the beneficial ownership of the Company, which occurs on the date that any
one person, or more than one person acting as a group, acquires beneficial ownership of Ensco UK
Shares or Ensco ADSs that, together with Ensco UK Shares or Ensco ADSs beneficially held by such
person or group, constitutes more than 50 percent of the total fair market value or total voting
power of the Ensco UK Shares or Ensco ADSs; (ii) in the effective control of the Company, which
occurs on the date that either (A) any one person, or more than one person acting as a group,
acquires (or has acquired during the 12-month period ending on the date of the most recent
acquisition by such person or persons) beneficial ownership of Ensco UK Shares or Ensco ADSs
possessing 35 percent or more of the total voting power of the Ensco UK Shares or Ensco ADSs, or
(B) a majority of the members of the Board is replaced during any 12-month period by directors
whose appointment or election is not endorsed by a majority of the members of the Board prior to
the date of the appointment or election; or (iii) in the ownership of a substantial portion of the
Company’s assets, which occurs on the date that any one person, or more than one person acting as a
group, acquires (or has acquired during the 12-month period ending on the date of the most recent
acquisition by such person or persons) assets from the Company that have a total gross fair market
value equal to or more than 40 percent of the total gross fair market value of all of the assets of
the Company immediately prior to such acquisition or acquisitions. For this purpose, gross fair
market value means the value of the assets of the Company, or the value of the assets being
disposed of, determined without regard to any liabilities associated with such assets. The
determination of whether a Change in

3

 

Control has occurred shall be determined by the Committee consistent with section 409A of the
Code.

     2. A new fourth paragraph is hereby added to Section 10.2 of the amended and restated 2005
SERP to read as follows:

     Notwithstanding the foregoing and pursuant to the power and authority vested in the Board
under this Section 10.2, the Board hereby determines that a “Change in Control” of the Company
shall not be deemed to have occurred for purposes of this Plan by virtue of the consummation of any
transaction or series of related transactions immediately following which the beneficial holders of
the voting stock of the Company immediately before such transaction or series of transactions
continue to have a majority of the direct or indirect ownership in one or more entities which,
singly or together, immediately following such transaction or series of transactions, either (i)
own all or substantially all of the assets of the Company as constituted immediately prior to such
transaction or series of transactions, or (ii) are the ultimate parent with direct or indirect
ownership of all of the voting shares of the Company after such transaction or series of
transactions. The stockholders of the Company approved and adopted at the Special Meeting of
Stockholders on December 22, 2009 the Agreement and Plan of Merger and Reorganization (the “Merger
Agreement”), by and between the Company and ENSCO Newcastle LLC, a newly formed Delaware limited
liability company (“Ensco Mergeco”) and a wholly-owned subsidiary of ENSCO Global Limited, a newly
formed Cayman Islands exempted company (“Ensco Cayman”) and a wholly-owned subsidiary of the
Company, pursuant to which Ensco Mergeco merged (the “Merger”) with and into the Company, with the
Company surviving the Merger as a wholly-owned subsidiary of Ensco Cayman (the “Reorganization”).
Specifically, the Reorganization shall not constitute a Change in Control of the Company.
Following the effective date of the Merger, the references to “stock” in the fourth paragraph of
this Section 10.2 shall be changed to “Ensco UK Shares or Ensco ADSs.”

     3. A new fifth paragraph is hereby added to Section 7.2 of the amended and restated 2005 SERP
to read as follows:

     Ensco Cayman (as defined in Section 10.2) became, in connection with the Merger (as defined in
Section 10.2), a wholly-owned subsidiary of ENSCO International Limited, a newly formed private
limited company incorporated under English law which, prior to the effective time of the Merger,
re-registered as a public limited company named “Ensco International plc” (“Ensco UK”). Pursuant
to the Merger Agreement, each issued and outstanding share of Company common stock, including each
share of Company common stock held by the Company stock fund, on the effective date of the Merger
was converted into one Ensco ADS and, thereafter, the references to “Company stock fund” in this
Section 7.2 shall be read and considered to be references to the “Ensco ADS fund.” For this
purpose, “Ensco ADS” means an American depository share, evidenced by an American depository
receipt which represents a Class A ordinary share in Ensco UK (“Ensco UK Share”).

4

 

     IN WITNESS WHEREOF, the Company, acting by and through its duly authorized officers, has
caused this Amendment No. 3 to the amendment and restatement of the ENSCO 2005 Supplemental
Executive Retirement Plan to be executed on the date first above written.

	 	 	 	 	 
	 	ENSCO INTERNATIONAL INCORPORATED

 	 
	 	/s/ Cary A. Moomjian, Jr.
 	 
	 	Cary A. Moomjian, Jr., 	 
	 	Vice President 	 
	 

5

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