Document:

EX-10.2

Exhibit 10.2

EIP SHARE UNIT AWARD AGREEMENT

Platinum Underwriters Holdings, Ltd.

Amended and Restated Executive Incentive Plan 

This EIP SHARE UNIT AWARD AGREEMENT (this “Award Agreement”) made as of this        day of
     , 20      , between Platinum Underwriters Holdings, Ltd., a Bermuda company (the
“Company”), and        (the “Participant”), is made pursuant to the terms of the
Company’s Amended and Restated Executive Incentive Plan (the “Plan”) in conjunction with the
Company’s 2010 Share Incentive Plan or any successor plan (the “Share Incentive Plan”) and, if
applicable, the Company’s Section 162(m) Performance Incentive Plan or any successor plan.

Section 1. Definitions. Capitalized terms used herein but not defined shall
have the meanings set forth in the Plan. For purposes of this Award Agreement, the terms
“Disability” and “Separation from Service” shall have the meanings attributed to such terms under
Section 409A of the Internal Revenue Code and the treasury regulations and other guidance
promulgated thereunder.

Section 2. Share Unit Award. The Company hereby grants to the Participant a
Share Unit Award of        share units (the “Share Units”) in respect of the        Performance Cycle
(the “Performance Cycle”) under the Plan. The Share Units are notional, non-voting units of
measurement based on the Fair Market Value (as defined in the Share Incentive Plan) of the Common
Shares, which will entitle the Participant to receive a payment, subject to the terms hereof, in
cash.

Section 3. Vesting Requirements. The Share Units shall become fully vested on
the third anniversary of the date hereof (the “Vesting Date”), subject to the Participant’s
continued employment with the Company or any of its subsidiaries through the Vesting Date.

Section 4. Termination of Employment; Breach of Certain Covenants.

(a) General Rule. Subject to the provisions of Section 4(b) hereof, in the event of
the Participant’s termination of employment with the Company or any of its subsidiaries for any
reason prior to the Vesting Date, the Share Units shall be immediately forfeited and automatically
cancelled without further action of the Company. If the Participant breaches Section 8.A hereof
prior to the Vesting Date, the Company may require the Participant to forfeit the Participant’s
interest in the Share Units. In the event of the Participant’s termination of employment by the
Company or any of its subsidiaries for “Cause” (as hereinafter defined) or the breach by the
Participant of Section 8.B hereof or any covenant not to compete with the Company or any of its
subsidiaries to which the Participant is or becomes subject (a “Non-Compete Covenant”), (i) the
Participant’s rights with respect to any Share Units hereunder, whether or not vested, may be
forfeited and cancelled by the Company and (ii) the Company may require the Participant to return
to the Company any or all of the payments made to the Participant in respect of the Share Units, in
such manner and on such terms and conditions as may be required by the Company. For purposes of
this Award Agreement, “Cause” shall mean (i) the Participant’s willful and continued failure to
substantially perform the Participant’s duties to the Company or any of its subsidiaries; (ii) the
Participant’s conviction of, or plea of guilty or nolo contendere to, a felony or other crime
involving moral turpitude; (iii) the Participant’s engagement in any malfeasance or fraud or
dishonesty of a substantial nature in connection with the Participant’s position with the Company
or any of its subsidiaries, or other willful act that materially damages the reputation of the
Company or any of its subsidiaries; (iv) the Participant’s breach of Section 8.B hereof or a
Non-Compete Covenant; or (v)  the sale, transfer or hypothecation by the Participant of Common
Shares in violation of the Share Ownership Guidelines of the Company; provided,
however, that no such act, failure to act or event that is capable of being cured by the
Participant shall be treated as “Cause” under this Award Agreement unless the Participant has been
provided a detailed, written statement of the basis for the Company’s belief that such act, failure
to act or event constitutes “Cause” and have had at least thirty (30) days after receipt of such
statement to cure such act, failure to act or event. Notwithstanding the foregoing, the definition
of Cause in any employment or severance agreement between the Company or any subsidiary and the
Participant in effect at the time of termination of employment shall supersede the foregoing
definition. For purposes of this Award Agreement, no act or failure to act shall be considered
“willful” unless it is done, or failed to be done, in bad faith, and without reasonable belief that
the act or failure to act was in the best interest of the Company.

(b) Exceptions. Notwithstanding the provisions of Section 4(a) hereof and subject to
any provision in any employment or other agreement with the Participant to the contrary, in the
event of the Participant’s termination of employment with the Company or any of its subsidiaries
prior to the Vesting Date (i) by the Company or any of its subsidiaries without Cause, (ii) as a
result of the Participant’s death or Disability, or (iii) upon the Participant’s retirement from
the Company with the consent of the Committee, the Participant shall be entitled to receive a
payment in respect of the Share Units determined in accordance with “Calculation of Payment” in
Exhibit A, but on a prorated basis based on the period of the Participant’s service with the
Company and, in the case of clause (i) thereof, the achievement by the Company of an ROE that
equals or exceeds the Annual Threshold ROE for any year or partial year in the Performance Cycle as
of the end of the fiscal quarter coincident with or following the date of termination, and, in the
case of clause (ii) thereof, the Average ROE achieved by the Company for the Performance Cycle as
of the end of the fiscal quarter coincident with or following the date of termination.
Notwithstanding the foregoing, the Participant’s employment will be treated as having been
terminated without Cause under this Award Agreement in the event of any termination by the
Participant for “good reason,” as such term or comparable term is defined under any employment
agreement in effect from time to time between the Participant and the Company or any subsidiary of
the Company. For avoidance of doubt, a right to payment with respect to Share Units may be
provided upon additional employment termination events in any employment or other agreement with
the Participant on a full or prorated basis.

Section 5. Payment of Award.

(a) General. Subject to the provisions of Sections 5(c) and 5(d) hereof, payment in
respect of the Award hereunder shall be made in cash as soon as practicable following the later of
the Vesting Date and the date that the Committee shall have approved the financial results of the
Company for the Performance Cycle and for each year in the Performance Cycle, but in all events not
later than the later of: (i) the last day in the calendar year in which the Vesting Date occurs,
and (ii) the 15th day of the third month following the Vesting Date. The amount of the payment to
be made in respect of the Award will be determined, in accordance with the terms of this Award
Agreement and the Plan, as set forth in Exhibit A hereto. In no event will the Participant
have any discretion under this Section 5(a) or under Sections 5(c) or 5(d) below to determine the
calendar year in which payment is made.

(b) Withholding. The payment in respect of the Share Units shall be made to the
Participant after deduction of applicable withholding taxes in the amount determined by the
Company, which shall be withheld at the applicable supplemental wage withholding rate, or such
other rate as determined by the Company, provided that such amount shall not exceed the
Participant’s estimated federal, state and local tax obligation with respect to payment in respect
of the Share Units. In lieu of the foregoing, the Company may allow the Participant to pay the
applicable withholding taxes to the Company in such other form as approved by the Company.

(c) Separation from Service. Notwithstanding the provisions of Section 5(a) hereof,
with respect to a payment pursuant to Section 4(b) hereof (other than a payment as a result of the
death of a Participant), the Participant shall receive such payment on the date that is six (6)
months following a Separation from Service. With respect to a payment pursuant to Section 4(b)
hereof as a result of the death of the Participant, the amount due under Section 4(b) shall be paid
as soon as practicable following such death but in no event following the later of: (i) the last
day in the calendar year in which the death occurs, and (ii) the 15th day of the third month
following such death.

(d) Change in Control. Notwithstanding the provisions of Section 5(a) hereof, upon a
Change in Control of the Company that constitutes a change in ownership or effective control of the
Company (or a change in the ownership of a substantial portion of the Company’s assets), within the
meaning of Section 409A of the Code, the Participant shall receive, in respect of an Award
hereunder, the greater of (i) the payment determined in accordance with the provisions of Section 8
of the Plan and (ii) the payment determined in accordance with clause (i) under “Calculation of
Payment” in Exhibit A, but on a prorated basis based on the period of service by the Participant
and the achievement by the Company of an ROE that equals or exceeds the Annual Threshold ROE in any
year or partial year in the Performance Cycle as of the end of the fiscal quarter immediately
preceding the date of such Change in Control, as determined by the Committee prior to such Change
in Control. Any payment made under this Section 5(d) shall be made as soon as practicable
following the occurrence of the Change in Control, but in all events not later than the later of:
(i) the last day in the calendar year in which the Change in Control occurs, and (ii) the
15th day of the third month following the Change in Control. To the extent that a
Participant is a party to an employment or consulting agreement with the Company containing
provisions for the treatment of Awards under the Plan upon a Change in Control, such provision of
the employment or consulting agreement shall govern and control for purposes of this Section 5(d).

Section 6. Restrictions on Transfer. No portion of the Share Units may be
sold, assigned, transferred, encumbered, hypothecated or pledged by the Participant, other than to
the Company as a result of forfeiture of the Share Units as provided herein, unless and until the
payment of the Share Units in accordance with Section 5 hereof.

Section 7. Limitation of Rights. The Participant shall not have any
privileges of a shareholder of the Company with respect to the Share Units. Nothing in this Award
Agreement shall confer upon the Participant any right to continue as an employee of the Company or
any subsidiary or to interfere in any way with any right of the Company to terminate the
Participant’s employment at any time.

Section 8. Restrictive Covenants. The effectiveness of this Award Agreement
is conditioned upon the Participant honoring the following restrictive covenants (the “Restrictive
Covenants”). These Restrictive Covenants are not intended to amend or supersede the terms of any
noncompetition or other restrictive covenant agreed to between the Company and the Participant or
to which the Participant is subject.

A. Nondisclosure of Confidential Information. The Participant acknowledges that
during the course of the Participant’s employment with the Company and/or its subsidiaries
(collectively, the “Companies”) the Participant has had or will have access to and knowledge of
certain information that the Companies consider confidential, and that the release of such
information to unauthorized persons would be extremely detrimental to the Companies. As a
consequence, the Participant hereby agrees and acknowledges that the Participant owes a duty to the
Companies not to disclose, and agrees that without the prior written consent of the Company, at any
time following the date hereof, either during or after the Participant’s employment with any of the
Companies, the Participant will not communicate, publish or disclose, to any person anywhere or
use, any Confidential Information (as hereinafter defined), except as may be necessary or
appropriate to conduct the Participant’s duties to the Companies (provided the Participant is
acting in good faith and in the best interests of the Companies) or as may be required by law or
judicial process. The Participant will use best efforts at all times to hold in confidence and to
safeguard any Confidential Information from falling into the hands of any unauthorized person. The
Participant will return to the Companies all Confidential Information in the Participant’s
possession or under the Participant’s control whenever any of the Companies shall so request, and
in any event will promptly return all such Confidential Information if the Participant’s
relationship with the Companies is terminated for any or no reason and will not retain any copies
thereof. For purposes hereof, the term “Confidential Information” shall mean any information used
by or belonging or relating to the Companies that is not known generally to the industry in which
the Companies are, or may be, engaged and which the Companies maintain on a confidential basis,
including, without limitation, any and all trade secrets and proprietary information, information
relating to the business and services, any employee information, customer lists and records,
business processes, procedures or standards, know-how, manuals, business strategies, records,
financial information, in each case, whether or not reduced to writing or stored electronically, as
well as any information that the Companies advise the Participant should be treated as
confidential.

B. Non-Solicitation and Non-Hire of Employees. The Participant agrees that for a
period beginning on the date hereof and ending 12 months following the date of the Participant’s
termination of employment with the Companies for any reason, the Participant shall not, on the
Participant’s own behalf or on behalf of any other person or entity, without the prior written
consent of the Company, directly or indirectly, solicit, hire or cause to be solicited or hired by
an enterprise with which Participant may ultimately become associated, or participate in or promote
the solicitation of, interfere with, attempt to influence or otherwise affect the employment of,
any employee of the Companies whose annual compensation exceeds $100,000.

C. Representation of Participant. Upon the acceptance by the Participant of the cash
payable following the vesting of Share Units hereunder, the Participant shall be deemed to
represent that the Participant has not engaged in nor has any intention of engaging in any action
that would constitute a violation of the Restrictive Covenants or any Non-Compete Covenant.

D. Injunctive Relief. The Participant acknowledges and agrees that the Restrictive
Covenant provisions of this Section 8 are reasonable and necessary for the successful operation of
the Companies. The Participant further acknowledges that if the Participant breaches any provision
of the Restrictive Covenants, the Companies will suffer irreparable injury. It is therefore agreed
that the Company shall have the right to enjoin any such breach or threatened breach, without
posting any bond, if so ordered by a court of competent jurisdiction. The existence of this right
to injunctive and other equitable relief shall not limit any other rights or remedies that the
Company may have at law or in equity including, without limitation, the right to monetary,
compensatory and punitive damages. In addition to any means at law or equity available to the
Company to enforce the Restrictive Covenants, the Company shall retain any rights it may have under
this Award Agreement relating to the Award for a breach of the Restrictive Covenants including,
without limitation, the right to cancel the Award and the right to require the Participant to
return to the Company any payments made to the Participant in respect of the Share Units. If any
provision of this Section 8 is determined by a court of competent jurisdiction to be not
enforceable in the manner set forth herein, the Participant and the Company agree that it is the
intention of the parties that such provision should be enforceable to the maximum extent possible
under applicable law. If any provision of this Section 8 is held to be invalid or unenforceable,
such invalidity or unenforceability shall not affect the validity or enforceability of any other
provision of this Section 8.

Section 9. Changes in Capitalization. The Award shall be subject to the
provisions of the Share Incentive Plan relating to adjustments for changes in corporate
capitalization.

Section 10. Notices. Any notice hereunder by the Participant shall be given
to the Company in writing and such notice shall be deemed duly given only upon receipt thereof by
the Secretary of the Company. Any notice hereunder by the Company shall be given to the
Participant in writing and such notice shall be deemed duly given only upon receipt thereof at such
address as the Participant may have on file with the Company.

Section 11. Construction. This Award Agreement and the Award evidenced hereby
are granted by the Company pursuant to the Plan and the Share Incentive Plan and are in all
respects subject to the terms and conditions of the Plan and the Share Incentive Plan. The
Participant hereby acknowledges that a copy of each of the Plan and the Share Incentive Plan has
been delivered to the Participant and the Participant accepts the Share Units hereunder subject to
all terms and provisions of the Plan and the Share Incentive Plan, which are incorporated herein by
reference. In the event of a conflict or ambiguity between any term or provision contained herein
and a term or provision of the Plan or the Share Incentive Plan, then the Plan or the Share
Incentive Plan, as applicable, shall govern and prevail. The construction of and decisions under
the Plan, the Share Incentive Plan and this Award Agreement are vested in the Committee, whose
determinations shall be final, conclusive and binding upon the Participant.

Section 12. Governing Law. This Award Agreement and the Award hereunder shall
be governed by, and construed in accordance with, the laws of the State of New York, excluding the
choice of law rules thereof.

Section 13. Counterparts. This Award Agreement may be executed in
counterparts, each of which shall be deemed to be an original but all of which together shall
constitute one and the same instrument.

Section 14. Binding Effect. This Award Agreement shall be binding upon and
inure to the benefit of the legatees, distributees, and personal representatives of the Participant
and the successors of the Company.

Section 15. Entire Agreement. This Award Agreement and the Plan constitute
the entire agreement between the parties with respect to the subject matter hereof and thereof,
merging any and all prior agreements.

[SIGNATURES ON FOLLOWING PAGE]

1

IN WITNESS WHEREOF, the Company and the Participant have executed this Award Agreement
effective as of the date first above written.

PLATINUM UNDERWRITERS HOLDINGS, LTD.

By:
                                                    

Name:
                                                     

Title:
                                                      

PARTICIPANT

By:
                                                          

Name:
                                                         

2

Exhibit A

to

EIP Share Unit Award Agreement

Payment Schedule

for the

2012 – 2014 Performance Cycle

Annual Threshold ROE

4%

	 	 	 	 	 
	Average ROE	 	Performance Percentage
	< 4%

	 	 	     0%     	 
	4% – 15%

	 	 	25%–150	%
	> 15%

	 	 	150	%

Calculation of Payment

The amount of payment in respect of the Award shall be equal to the greater of (i) the sum of the
number of Share Units multiplied by 8.33% for each year in the Performance Cycle in which the
Company has achieved an ROE that equals or exceeds the Annual Threshold ROE set forth above, and
(ii) the number of Share Units multiplied by the Performance Percentage set forth above
corresponding to Average ROE achieved by the Company for the Performance Cycle (with a Performance
Percentage that falls within the 4%-15% range of Average ROE determined by straight line
interpolation). Payment shall be made in cash.

3EX-10.3

Exhibit 10.3

SUPPLEMENTAL EIP SHARE UNIT AWARD AGREEMENT

Platinum Underwriters Holdings, Ltd.

Amended and Restated Executive Incentive Plan 

This SUPPLEMENTAL EIP SHARE UNIT AWARD AGREEMENT (this “Award Agreement”) made as of this 14th
day of February, 2012, between Platinum Underwriters Holdings, Ltd., a Bermuda company (the
“Company”), and        (the “Participant”), is made pursuant to the terms of the
Company’s Amended and Restated Executive Incentive Plan (the “Plan”) in conjunction with the
Company’s 2010 Share Incentive Plan or any successor plan (the “Share Incentive Plan”) and, if
applicable, the Company’s Section 162(m) Performance Incentive Plan or any successor plan.

Section 1. Definitions. Capitalized terms used herein but not defined shall
have the meanings set forth in the Plan. For purposes of this Award Agreement, the terms
“Disability” and “Separation from Service” shall have the meanings attributed to such terms under
Section 409A of the Internal Revenue Code and the treasury regulations and other guidance
promulgated thereunder.

Section 2. Share Unit Award. The Company hereby grants to the Participant a
Share Unit Award of        share units (the “Share Units”) in respect of the 2012-2013 Performance
Cycle (the “Performance Cycle”) under the Plan. The Share Units are notional, non-voting units of
measurement based on the Fair Market Value (as defined in the Share Incentive Plan) of the Common
Shares, which will entitle the Participant to receive payments, subject to the terms hereof, in
Common Shares.

Section 3. Vesting Requirements. One-half of the Share Units shall become
fully vested on the date in 2013 on which the Committee certifies the performance results for 2012,
and one-half of the Share Units shall become fully vested on the date in 2014 on which the
Committee certifies the performance results for 2013 (each, a “Vesting Date”), subject to the
Participant’s continued employment with the Company or any of its subsidiaries through each such
Vesting Date.

Section 4. Termination of Employment; Breach of Certain Covenants. In the
event of the Participant’s termination of employment with the Company or any of its subsidiaries
for any reason prior to a Vesting Date, any Share Units which have not yet vested shall be
immediately forfeited and automatically cancelled without further action of the Company. If the
Participant breaches Section 8.A hereof prior to a Vesting Date, the Company may require the
Participant to forfeit the Participant’s interest in any Share Units which have not yet vested. In
the event of the Participant’s termination of employment by the Company or any of its subsidiaries
for “Cause” (as hereinafter defined) or the breach by the Participant of Section 8.B hereof or any
covenant not to compete with the Company or any of its subsidiaries to which the Participant is or
becomes subject (a “Non-Compete Covenant”), (i) the Participant’s rights with respect to any Share
Units hereunder, whether or not vested, may be forfeited and cancelled by the Company and (ii) the
Company may require the Participant to return to the Company any or all of the payments made to the
Participant in respect of the Share Units, in such manner and on such terms and conditions as may
be required by the Company. For purposes of this Award Agreement, “Cause” shall mean (i) the
Participant’s willful and continued failure to substantially perform the Participant’s duties to
the Company or any of its subsidiaries; (ii) the Participant’s conviction of, or plea of guilty or
nolo contendere to, a felony or other crime involving moral turpitude; (iii) the Participant’s
engagement in any malfeasance or fraud or dishonesty of a substantial nature in connection with the
Participant’s position with the Company or any of its subsidiaries, or other willful act that
materially damages the reputation of the Company or any of its subsidiaries; (iv) the Participant’s
breach of Section 8.B hereof or a Non-Compete Covenant; or (v)  the sale, transfer or hypothecation
by the Participant of Common Shares in violation of the Share Ownership Guidelines of the Company;
provided, however, that no such act, failure to act or event that is capable of
being cured by the Participant shall be treated as “Cause” under this Award Agreement unless the
Participant has been provided a detailed, written statement of the basis for the Company’s belief
that such act, failure to act or event constitutes “Cause” and have had at least thirty (30) days
after receipt of such statement to cure such act, failure to act or event. Notwithstanding the
foregoing, the definition of Cause in any employment or severance agreement between the Company or
any subsidiary and the Participant in effect at the time of termination of employment shall
supersede the foregoing definition. For purposes of this Award Agreement, no act or failure to act
shall be considered “willful” unless it is done, or failed to be done, in bad faith, and without
reasonable belief that the act or failure to act was in the best interest of the Company.

Section 5. Payment of Award.

(a) General. Subject to the provisions of Section 5(c) hereof, payment in respect of
each one-half of the Award hereunder shall be made in Common Shares as soon as practicable
following the Vesting Date for such one-half, but in all events prior to March 15 of the calendar
year following the year in which such Vesting Date occurs. The amount of the payments to be made
in respect of the Award will be determined, in accordance with the terms of this Award Agreement
and the Plan, as set forth in Exhibit A hereto.

(b) Withholding. Any payment in respect of the Share Units shall be made to the
Participant after deduction of applicable withholding taxes in the amount determined by the
Company, which shall be withheld at the applicable supplemental wage withholding rate, or such
other rate as determined by the Company, provided that such amount shall not exceed the
Participant’s estimated federal, state and local tax obligation with respect to payment in respect
of such Share Units. In lieu of the foregoing, the Company may allow the Participant to pay the
applicable withholding taxes to the Company in such other form as approved by the Company.

(c) Change in Control. Notwithstanding the provisions of Section 5(a) hereof, upon a
Change in Control of the Company that constitutes a change in ownership or effective control of the
Company (or a change in the ownership of a substantial portion of the Company’s assets), within the
meaning of Section 409A of the Code, the Participant shall receive, in respect of an Award
hereunder, the payments determined, in accordance with the terms of this Award Agreement and the
Plan, as set forth in Exhibit A hereto, but on a prorated basis based on the period of
service by the Participant and the achievement by the Company of an ROE that equals or exceeds the
Annual Threshold ROE in any year or partial year in the Performance Cycle as of the end of the
fiscal quarter immediately preceding the date of such Change in Control, as determined by the
Committee prior to such Change in Control. Any payments made under this Section 5(c) shall be made
as soon as practicable following the occurrence of the Change in Control, but in all events prior
to the March 15 of the calendar year following the year in which the Change in Control occurs. To
the extent that a Participant is a party to an employment or consulting agreement with the Company
containing provisions for the treatment of Awards under the Plan upon a Change in Control, such
provision of the employment or consulting agreement shall govern and control for purposes of this
Section 5(c).

Section 6. Restrictions on Transfer. No portion of the Share Units may be
sold, assigned, transferred, encumbered, hypothecated or pledged by the Participant, other than to
the Company as a result of forfeiture of the Share Units as provided herein, unless and until the
payment of the Share Units in accordance with Section 5 hereof.

Section 7. Limitation of Rights. The Participant shall not have any
privileges of a shareholder of the Company with respect to the Share Units. Nothing in this Award
Agreement shall confer upon the Participant any right to continue as an employee of the Company or
any subsidiary or to interfere in any way with any right of the Company to terminate the
Participant’s employment at any time.

Section 8. Restrictive Covenants. The effectiveness of this Award Agreement
is conditioned upon the Participant honoring the following restrictive covenants (the “Restrictive
Covenants”). These Restrictive Covenants are not intended to amend or supersede the terms of any
noncompetition or other restrictive covenant agreed to between the Company and the Participant or
to which the Participant is subject.

A. Nondisclosure of Confidential Information. The Participant acknowledges that
during the course of the Participant’s employment with the Company and/or its subsidiaries
(collectively, the “Companies”) the Participant has had or will have access to and knowledge of
certain information that the Companies consider confidential, and that the release of such
information to unauthorized persons would be extremely detrimental to the Companies. As a
consequence, the Participant hereby agrees and acknowledges that the Participant owes a duty to the
Companies not to disclose, and agrees that without the prior written consent of the Company, at any
time following the date hereof, either during or after the Participant’s employment with any of the
Companies, the Participant will not communicate, publish or disclose, to any person anywhere or
use, any Confidential Information (as hereinafter defined), except as may be necessary or
appropriate to conduct the Participant’s duties to the Companies (provided the Participant is
acting in good faith and in the best interests of the Companies) or as may be required by law or
judicial process. The Participant will use best efforts at all times to hold in confidence and to
safeguard any Confidential Information from falling into the hands of any unauthorized person. The
Participant will return to the Companies all Confidential Information in the Participant’s
possession or under the Participant’s control whenever any of the Companies shall so request, and
in any event will promptly return all such Confidential Information if the Participant’s
relationship with the Companies is terminated for any or no reason and will not retain any copies
thereof. For purposes hereof, the term “Confidential Information” shall mean any information used
by or belonging or relating to the Companies that is not known generally to the industry in which
the Companies are, or may be, engaged and which the Companies maintain on a confidential basis,
including, without limitation, any and all trade secrets and proprietary information, information
relating to the business and services, any employee information, customer lists and records,
business processes, procedures or standards, know-how, manuals, business strategies, records,
financial information, in each case, whether or not reduced to writing or stored electronically, as
well as any information that the Companies advise the Participant should be treated as
confidential.

B. Non-Solicitation and Non-Hire of Employees. The Participant agrees that for a
period beginning on the date hereof and ending 12 months following the date of the Participant’s
termination of employment with the Companies for any reason, the Participant shall not, on the
Participant’s own behalf or on behalf of any other person or entity, without the prior written
consent of the Company, directly or indirectly, solicit, hire or cause to be solicited or hired by
an enterprise with which Participant may ultimately become associated, or participate in or promote
the solicitation of, interfere with, attempt to influence or otherwise affect the employment of,
any employee of the Companies whose annual compensation exceeds $100,000.

C. Representation of Participant. Upon the acceptance by the Participant of the
Common Shares payable following the vesting of Share Units hereunder, the Participant shall be
deemed to represent that the Participant has not engaged in nor has any intention of engaging in
any action that would constitute a violation of the Restrictive Covenants or any Non-Compete
Covenant.

D. Injunctive Relief. The Participant acknowledges and agrees that the Restrictive
Covenant provisions of this Section 8 are reasonable and necessary for the successful operation of
the Companies. The Participant further acknowledges that if the Participant breaches any provision
of the Restrictive Covenants, the Companies will suffer irreparable injury. It is therefore agreed
that the Company shall have the right to enjoin any such breach or threatened breach, without
posting any bond, if so ordered by a court of competent jurisdiction. The existence of this right
to injunctive and other equitable relief shall not limit any other rights or remedies that the
Company may have at law or in equity including, without limitation, the right to monetary,
compensatory and punitive damages. In addition to any means at law or equity available to the
Company to enforce the Restrictive Covenants, the Company shall retain any rights it may have under
this Award Agreement relating to the Award for a breach of the Restrictive Covenants including,
without limitation, the right to cancel the Award and the right to require the Participant to
return to the Company any payments made to the Participant in respect of the Share Units. If any
provision of this Section 8 is determined by a court of competent jurisdiction to be not
enforceable in the manner set forth herein, the Participant and the Company agree that it is the
intention of the parties that such provision should be enforceable to the maximum extent possible
under applicable law. If any provision of this Section 8 is held to be invalid or unenforceable,
such invalidity or unenforceability shall not affect the validity or enforceability of any other
provision of this Section 8.

Section 9. Changes in Capitalization. The Award shall be subject to the
provisions of the Share Incentive Plan relating to adjustments for changes in corporate
capitalization.

Section 10. Notices. Any notice hereunder by the Participant shall be given
to the Company in writing and such notice shall be deemed duly given only upon receipt thereof by
the Secretary of the Company. Any notice hereunder by the Company shall be given to the
Participant in writing and such notice shall be deemed duly given only upon receipt thereof at such
address as the Participant may have on file with the Company.

Section 11. Construction. This Award Agreement and the Award evidenced hereby
are granted by the Company pursuant to the Plan and the Share Incentive Plan and are in all
respects subject to the terms and conditions of the Plan and the Share Incentive Plan. The
Participant hereby acknowledges that a copy of each of the Plan and the Share Incentive Plan has
been delivered to the Participant and the Participant accepts the Share Units hereunder subject to
all terms and provisions of the Plan and the Share Incentive Plan, which are incorporated herein by
reference. In the event of a conflict or ambiguity between any term or provision contained herein
and a term or provision of the Plan or the Share Incentive Plan, then the Plan or the Share
Incentive Plan, as applicable, shall govern and prevail. The construction of and decisions under
the Plan, the Share Incentive Plan and this Award Agreement are vested in the Committee, whose
determinations shall be final, conclusive and binding upon the Participant.

Section 12. Governing Law. This Award Agreement and the Award hereunder shall
be governed by, and construed in accordance with, the laws of the State of New York, excluding the
choice of law rules thereof.

Section 13. Counterparts. This Award Agreement may be executed in
counterparts, each of which shall be deemed to be an original but all of which together shall
constitute one and the same instrument.

Section 14. Binding Effect. This Award Agreement shall be binding upon and
inure to the benefit of the legatees, distributees, and personal representatives of the Participant
and the successors of the Company.

Section 15. Entire Agreement. This Award Agreement and the Plan constitute
the entire agreement between the parties with respect to the subject matter hereof and thereof,
merging any and all prior agreements.

[SIGNATURES ON FOLLOWING PAGE]

1

IN WITNESS WHEREOF, the Company and the Participant have executed this Award Agreement
effective as of the date first above written.

PLATINUM UNDERWRITERS HOLDINGS, LTD.

By:
                                                          

Name: 

                                                          

Title:

                                                          

PARTICIPANT

By:
                                                          

Name: 

                                                          

Exhibit A

to

Supplemental EIP Share Unit Award Agreement

Payment Schedule

for the

2012 – 2013 Performance Cycle

Annual Threshold ROE

4%

Calculation of Payment

The amount of the payments in respect of each one-half of the Award shall be equal to one-half of
the number of Share Units for each year in the Performance Cycle in which the Company has achieved
an ROE that equals or exceeds the Annual Threshold ROE set forth above. The payments shall be made
in Common Shares.

2

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