Document:

EX-10.1

 Exhibit 10.1 

Execution Version 
 ASPEN
INSURANCE HOLDINGS LIMITED 
 PERFORMANCE SHARE AWARD AGREEMENT 

THIS AGREEMENT (the “Agreement”), is made effective as of the 11th day of February, 2013 (hereinafter called the
“Date of Grant”), between Aspen Insurance Holdings Limited, a Bermuda corporation (hereinafter called the “Company”), and XXXXX (hereinafter called the “Participant”): 

R E C I T A L S: 

WHEREAS, the Company has adopted the Aspen Insurance Holdings Limited 2003 Share Incentive Plan, as amended from time to time
(the “Plan”), which Plan is incorporated herein by reference and made a part of this Agreement. Capitalized terms not otherwise defined herein shall have the same meanings as in the Plan; and 

WHEREAS, the Committee has determined that it would be in the best interests of the Company and its shareholders to grant the
performance shares provided for herein to the Participant pursuant to the Plan and the terms set forth herein. 
 NOW
THEREFORE, in consideration of the mutual covenants hereinafter set forth, the parties agree as follows: 
  

	1.	 Grant of Performance Shares.    The Company hereby awards to the Participant XXXX Shares, payment of which is dependent
upon the performance of the Company as described in Section 2 of this Agreement (the “Performance Shares”). 

  

	2.	 Vesting.    The Performance Shares shall vest and become payable based on the performance and service requirements set
forth in Sections 2(c) to 2(j) below and the definition of growth in diluted Book Value Per Share (“BVPS Growth”) set forth in Section 2(a) below. 

 

	 	(a)	 For the purposes of this Agreement, 2012, 2013, 2014 and 2015 BVPS Growth, respectively, shall be equal to gn% (for n = 2012, 2013, 2014, 2015), where 

  

	 	 	 gn = 100 x (Bn – B(n-1) + Dn) / B(n-1), and 

  

	 	(i)	 Bn = BVPS at December 31 in year n, 

 

	 	(ii)	 B(n-1) = BVPS at December 31 in year n-1, 

  

	 	(iii)	 Dn = total dividends per share paid to ordinary shareholders in year n, and

  

	 	(iv)	 BVPS is the diluted book value per ordinary share of the Company as calculated in accordance with the accounting policies and definitions adopted
for the purpose of preparation of the annual audited financial statements of the Company. 

	 	(b)	 For purposes of this Agreement: 

  

	 	(i)	 “2013 Fiscal Year” shall mean the Company’s fiscal year ended December 31, 2013, 

 

	 	(ii)	 “2014 Fiscal Year” shall mean the Company’s fiscal year ended December 31, 2014, and 

 

	 	(iii)	 “2015 Fiscal Year” shall mean the Company’s fiscal year ended December 31, 2015. 

 

	 	(c)	 Subject to the Participant’s continued Employment with the Company (which Employment shall not include the performance of services under a
notice of termination or resignation), a maximum of one-third (1/3) of the Performance Shares awarded hereunder (the “2013 BVPS Award”) shall be eligible for vesting (“Eligible Shares”) upon the later of (i) the date
the Company’s outside auditors complete the audit of the Company’s financial statements containing the information necessary to compute the Company’s BVPS for the 2013 Fiscal Year or (ii) the date such BVPS is approved by the
Board of Directors or an authorized committee thereof, but only to the extent provided below: 

  

			
	 2013 BVPS Growth
	  	Percentage of Eligible Shares
		
	 < 5%
	  	0%
		
	 5%
	  	10%
		
	 10%
	  	100%
		
	 3 20%
	  	200%

 Interim percentages to be pro-rated. 

Notwithstanding the foregoing, if the 2013 BVPS Growth is greater than 10%, and the average of the 2012 BVPS Growth and the
2013 BVPS Growth is less than the average of the minimum vesting thresholds for such years (with the 2012 BVPS Growth minimum vesting threshold being deemed to be 5% for this purpose), then the Percentage of Eligible Shares shall be 100%.
Notwithstanding the foregoing, if in the judgment of the Committee, the main reason for the 2013 BVPS Growth falling below 5% is the impact of rising interest rates and bond yields, then the Committee may, at its discretion, disapply the limitation
on 100% vesting described in this paragraph. 
  

	 	(d)	 Subject to the Participant’s continued Employment with the Company (which Employment shall not include the performance of services under a
notice of termination or resignation), a maximum of one-third (1/3) of the Performance Shares awarded hereunder (the “2014 BVPS Award”) shall become Eligible Shares upon the later of (i) the date the Company’s outside
auditors complete the audit of the Company’s financial statements containing the information necessary to compute the Company’s BVPS for the 2014 Fiscal Year or (ii) the date such BVPS is approved by the Board of Directors or an
authorized 

	 	 
committee thereof, but only to the extent provided in a vesting schedule to be provided to the Participant during the first quarter of the 2014 Fiscal Year. The Committee shall determine the
vesting conditions for the 2014 BVPS Award taking into consideration the market conditions and the Company’s business plans at the commencement of the 2014 Fiscal Year. 

Notwithstanding the schedule to be provided to the Participant during the first quarter of the 2014 Fiscal Year, if the 2014
BVPS Growth is greater than the target vesting level at 100% vesting determined in accordance with the schedule provided, and the average of the 2014 BVPS Growth and the 2013 BVPS Growth is less than the average of the minimum vesting thresholds for
such years, then the Percentage of Eligible Shares shall be 100%. Notwithstanding the foregoing, if in the judgment of the Committee, the main reason for the 2013 BVPS Growth falling below the minimum vesting threshold for such year is the impact of
rising interest rates and bond yields, then the Committee may, at its discretion, disapply the limitation on 100% vesting described in this paragraph. 
  

	 	(e)	 Subject to the Participant’s continued Employment with the Company (which Employment shall not include the performance of services under a
notice of termination or resignation), a maximum of one-third (1/3) of the Performance Shares awarded hereunder (the “2015 BVPS Award”) shall become Eligible Shares upon the later of (i) the date the Company’s outside
auditors complete the audit of the Company’s financial statements containing the information necessary to compute the Company’s BVPS for the 2015 Fiscal Year or (ii) the date such BVPS is approved by the Board of Directors or an
authorized committee thereof, but only to the extent provided in a vesting schedule to be provided to the Participant during the first quarter of the 2015 Fiscal Year. The Committee shall determine the vesting conditions for the 2015 BVPS Award
taking into consideration the market conditions and the Company’s business plans at the commencement of the 2015 Fiscal Year. 

Notwithstanding the schedule to be provided to the Participant during the first quarter of the 2015 Fiscal Year, if the 2015
BVPS Growth is greater than the target vesting level at 100% vesting determined in accordance with the schedule provided, and the average of the 2015 BVPS Growth and the 2014 BVPS Growth is less than the average of the minimum vesting thresholds for
such years, then the Percentage of Eligible Shares shall be 100%. Notwithstanding the foregoing, if in the judgment of the Committee, the main reason for the 2014 BVPS Growth falling below the minimum vesting threshold for such year is the impact of
rising interest rates and bond yields, then the Committee may, at its discretion, disapply the limitation on 100% vesting described in this paragraph. 
  

	 	(f)	 Subject to the Participant’s continued Employment with the Company (which Employment shall not include the performance of services under a
notice of termination or resignation), all Eligible Shares shall become vested upon the later of (i) the date the Company’s outside auditors complete the audit of the Company’s financial statements containing the information necessary
to compute the Company’s BVPS for the 2015 Fiscal Year or (ii) the date such BVPS is approved by the Board of Directors or an authorized committee thereof. 

	 	(g)	 In connection with any event described in Section 10(a) of the Plan or in the event of a change in applicable accounting rules, the Committee
shall make such adjustments in the terms of the Performance Shares as it shall determine shall be necessary to equitably reflect such event in order to prevent dilution or enlargement of the potential benefits of the Performance Shares. The
Committee’s determination as to any such adjustment shall be final. 

  

	 	(h)	 Subject to the terms of the Participant’s employment agreement with the Company, or any of its Affiliates (which, if applicable, shall
supersede this provision), if the Participant’s Employment with the Company is terminated for any reason, the Performance Shares shall, to the extent not then vested, be canceled by the Company without consideration. 

 

	 	(i)	 Any Performance Shares that do not become Eligible Shares by reason of the Company’s failure to achieve a percentage increase in BVPS as set
forth above (or, if applicable, as set forth in schedules to be provided to the Participant) shall immediately be forfeited without consideration. 

  

	 	(j)	 Notwithstanding anything to the contrary contained herein, in the event that the Participant’s Employment with the Company is terminated
(i) due to the Participant’s death or (ii) by the Company due to the Participant’s Disability, all Eligible Shares shall vest in full on the date of such termination of Employment. For the avoidance of doubt, any Performance
Shares that have not become Eligible Shares on or before the date of such termination of Employment shall be forfeited on such date without consideration. For purposes of this Agreement, “Disability” shall mean the inability of a
Participant to perform in all material respects his or her duties and responsibilities to the Company, or any Affiliate of the Company, by reason of a physical or mental disability or infirmity which inability is reasonably expected to be permanent
and has continued (i) for a period of six consecutive months or (ii) such shorter period as the Committee may determine in good faith. The Disability determination shall be in the sole discretion of the Committee and a Participant (or his
or her representative) shall furnish the Committee with medical evidence documenting the Participant’s disability or infirmity, which is reasonably satisfactory to the Committee. 

 

	3.	 Payment. 

  

	 	(a)	 The Company shall deliver to the Participant one Share for each vested Performance Share. Any fractional share will be rounded down to the nearest
whole Share and the remainder forfeited. 

  

	 	(b)	 Except as otherwise provided in the Plan, vested Performance Shares shall be paid to the Participant as soon as practicable after the date such
Performance Shares become vested, but in no event later than the fifteenth (15th) day of the third (3rd) month following the end of
the fiscal year in which the Performance Shares become vested. 

  

	 	(c)	 When Performance Shares are paid, the Company shall issue certificates in the Participant’s name for such. However, the Company shall not be
liable to the Participant for damages relating to any delays in issuing the certificates to him, 

	 	 
any loss of the certificates, or any mistakes or errors in the issuance of the certificates or in the certificates themselves. 

 

	4.	 No Right to Continued Employment.    The granting of the Performance Shares evidenced hereby and this Agreement shall
impose no obligation on the Company or any Affiliate to continue the Employment of the Participant and shall not lessen or affect the Company’s or its Affiliate’s right to terminate the Employment of such Participant.

  

	5.	 Legend on Certificates.    The certificates representing the Shares paid in settlement of Performance Shares shall be
subject to such stop transfer orders and other restrictions as the Committee may deem advisable under the Plan or the rules, regulations, and other requirements of the U.S. Securities and Exchange Commission, any stock exchange upon which such
Shares are listed, and any applicable laws, and the Committee may cause a legend or legends to be put on any such certificates to make appropriate reference to such restrictions. 

 

	6.	 Transferability.    The Performance Shares may not be assigned, alienated, pledged, attached, sold or otherwise
transferred or encumbered by the Participant otherwise than by will or by the laws of descent and distribution, and any such purported assignment, alienation, pledge, attachment, sale, transfer or encumbrance shall be void and unenforceable against
the Company or any Affiliate; provided that the designation of a beneficiary shall not constitute an assignment, alienation, pledge, attachment, sale, transfer or encumbrance. For avoidance of doubt, Shares issued to the Participant in payment of
vested Performance Shares pursuant to Section 3 hereof shall not be subject to any of the foregoing transferability restrictions. 

  

	7.	 Withholding.    The Participant may be required to pay to the Company or any Affiliate and the Company shall have the
right and is hereby authorized to withhold, any applicable withholding taxes in respect of Performance Shares and to take such other action as may be necessary in the opinion of the Committee to satisfy all obligations for the payment of such
withholding taxes. 

  

	8.	 Securities Laws.    Upon the acquisition of any Shares pursuant to settlement of Performance Shares, the Participant
will make or enter into such written representations, warranties and agreements as the Committee may reasonably request in order to comply with applicable securities laws or with this Agreement. 

 

	9.	 Bermuda Government Regulations.    No Shares shall be issued pursuant to this Agreement unless and until all relevant
licenses, permissions and authorizations required to be granted by the Government of Bermuda, or by any authority or agency thereof, shall have been duly received. 

 

	10.	 Notices.    Any notice necessary under this Agreement shall be addressed to the Company in care of its Secretary at the
principal executive office of the Company and to the Participant at the address appearing in the personnel records of the Company for the Participant or to either party at such other address as either party hereto may hereafter designate in writing
to the other. Any such notice shall be deemed effective upon receipt thereof by the addressee. 

	11.	 Choice of Law.    THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF BERMUDA, without
regard to conflicts of laws principles. 

  

	12.	 Performance Shares Subject to the Plan.    By entering into this Agreement the Participant agrees and acknowledges that
the Participant has received and read a copy of the Plan. The Performance Shares are subject to the Plan (including without limitation the arbitration provision), and the terms and provisions of the Plan, as it may be amended from time to time, are
hereby incorporated herein by reference. In the event of a conflict between any term or provision contained herein and a term or provision of the Plan, the applicable terms and provisions of the Plan will govern and prevail. 

 

	13.	 Rights as a Shareholder.    The Participant shall have no rights as a shareholder, and shall not receive dividends, with
respect to any Performance Shares until the Performance Shares have been paid out and Share certificates have been issued to the Participant. 

  

	14.	 Fiscal Year.    If the Company’s fiscal year is changed to other than a calendar year, the references to calendar
year in this Agreement shall be adjusted to appropriately reflect the change. 

  

	15.	 Signature in Counterparts.    This Agreement may be signed in counterparts, each of which shall be an original, with the
same effect as if the signatures thereto and hereto were upon the same instrument. 

 IN WITNESS WHEREOF,
the parties hereto have executed this Agreement. 
  

	
	ASPEN INSURANCE HOLDINGS LIMITED
	
	 

  

	 Mike Cain

	 Group General Counsel

  
  

	
	 AGREED AND ACKNOWLEDGED AS

OF THE DATE FIRST ABOVE WRITTEN:

	
	   

	 ParticipantEX-10.2

 Exhibit 10.2 

SUPPLEMENTAL CONFIRMATION 
  

			
	To:	    	 Aspen Insurance Holdings Limited

141 Front Street
 Hamilton, HM
19
 Bermuda

		
	From:	    	 Goldman, Sachs & Co.

		
	Subject:	    	 Accelerated Stock Buyback

		
	Ref. No:	    	 SDB4166348944

		
	Date:	    	 February 26, 2013

  
  

The purpose of this Supplemental Confirmation is to confirm the terms and conditions of the Transaction entered into between
Goldman, Sachs & Co. (“GS&Co.”) and Aspen Insurance Holdings Limited (“Counterparty”) (together, the “Contracting Parties”) on the Trade Date specified below. This Supplemental
Confirmation is a binding contract between GS&Co. and Counterparty as of the relevant Trade Date for the Transaction referenced below. 

1.           This Supplemental Confirmation supplements, forms part of, and is subject
to the Master Confirmation dated as of September 28, 2007 (the “Master Confirmation”) between the Contracting Parties, as amended and supplemented from time to time. All provisions contained in the Master Confirmation govern
this Supplemental Confirmation except as expressly modified below. Capitalized terms used herein without definition shall have the respective meanings ascribed to them in the Master Confirmation. 

2.            The terms of the Transaction to which this Supplemental Confirmation
relates are as follows: 
  
  

			
	 Trade Date:
	  	 February 26, 2013

		
	 Forward Price Adjustment Amount:
	  	 USD [***]

		
	 Calculation Period:
	  	 The period from, and including, February 27, 2013 to, and including, the Termination Date (as adjusted in accordance with the provisions of the Master
Confirmation).

		
	 Termination Date:
	  	 The Scheduled Termination Date; provided that GS&Co. shall have the right to designate any Exchange Business Day on or after the First
Acceleration Date to be the Termination Date (the “Accelerated Termination Date”) by delivering notice to Counterparty of any such designation prior to 11:59 p.m. New York City time on the Exchange Business Day immediately following
the designated Accelerated Termination Date.

  
  

 
 *** Indicates material has
been omitted pursuant to a Confidential Treatment Request filed with the Securities and Exchange Commission. A complete copy of this agreement has been filed separately with the Securities and Exchange Commission. 

			
	 Scheduled Termination Date:
	  	 October 3, 2013 (or, if such date is not a Scheduled Trading Day, the next following Scheduled Trading Day), subject to GS&Co.’s right to accelerate
the Termination Date to any date on or after the First Acceleration Date and postponement as provided in “Market Disruption Event” below.

		
	 First Acceleration Date:
	  	 [***] (or, if such date is not a Scheduled Trading Day, the next following Scheduled Trading Day).

		
	 Prepayment Amount:
	  	 USD 150,000,000.00

		
	 Prepayment Date:
	  	 Three (3) Exchange Business Days following the Trade Date.

		
	 Counterparty Additional Payment Amount:
	  	 USD 0.00

		
	 Settlement Terms:
	  	
		
	 Settlement Procedures:
	  	 If the Number of Shares to be Delivered is positive, Physical Settlement shall be applicable; provided that GS&Co. does not, and shall not, make the
agreement or the representations set forth in Section 9.11 of the Equity Definitions related to the restrictions imposed by applicable securities laws with respect to any Shares delivered by GS&Co. to Counterparty under any Transaction. If the
Number of Shares to be Delivered is negative, then the Counterparty Settlement Provisions in Annex A shall apply.

		
	 Number of Shares to be Delivered:
	  	 A number of Shares equal to (x)(a) the Prepayment Amount divided by (b) the Divisor Amount minus (y) the number of Initial
Shares.

		
	 Divisor Amount:
	  	 The greater of (i) the Forward Price minus the Forward Price Adjustment Amount and (ii) USD 3.00.

		
	 Settlement Date:
	  	 If the Number of Shares to be Delivered is positive, the date that is one Settlement Cycle immediately following the Termination Date.

		
	 Settlement Currency:
	  	 USD

		
	 Initial Share Delivery:
	  	 GS&Co. shall deliver a number of Shares equal to the Initial Shares to Counterparty on the Initial Share Delivery Date in accordance with Section 9.4 of
the Equity Definitions, with the Initial Share Delivery Date deemed to be a “Settlement Date” for purposes of such Section 9.4.

 
  

 
 *** Indicates material has
been omitted pursuant to a Confidential Treatment Request filed with the Securities and Exchange Commission. A complete copy of this agreement has been filed separately with the Securities and Exchange Commission. 

  
 2 

			
	 Initial Shares:
	  	 3,348,214 Shares; provided that if, in connection with the Transaction, GS&Co. is unable, after using reasonable good faith efforts, to borrow or
otherwise acquire a number of Shares equal to the Initial Shares for delivery to Counterparty on the Initial Share Delivery Date, the Initial Shares delivered on the Initial Share Delivery Date shall be reduced to such number of Shares that
GS&Co. is able to so borrow or otherwise acquire, and GS&Co. shall use reasonable good faith efforts to borrow or otherwise acquire a number of Shares equal to the shortfall in the Initial Share Delivery and to deliver such additional Shares
as soon as reasonably practicable. The aggregate of all Shares delivered to Counterparty in respect of the Transaction pursuant to this paragraph shall be the “Initial Shares” for purposes of “Number of Shares to be
Delivered.”

		
	 Initial Share Delivery Date:
	  	 The Prepayment Date

		
	 Loss of Stock Borrow:
	  	 Applicable

		
	 Maximum Stock Loan Rate:
	  	 200 basis points per annum

		
	 Increased Cost of Stock Borrow:
	  	 Applicable

		
	 Initial Stock Loan Rate:
	  	 25 basis points per annum

		
	 Ordinary Dividend Amount:
	  	 For any calendar quarter, USD 0.17

		
	 Early Ordinary Dividend Payment:
	  	 If a record date for any Dividend that is not an Extraordinary Dividend occurs during any calendar quarter occurring (in whole or in part) during the
Relevant Period and is prior to the Scheduled Record Date for such calendar quarter, the Calculation Agent shall make such adjustment to the exercise, settlement, payment or any other terms of the Transaction as the Calculation Agent determines
appropriate to account for the economic effect on the Transaction of such event.

		
	 Scheduled Record Date:
	  	 May 10, 2013 and August 9, 2013

		
	 Reserved Shares:
	  	 [***]

		
	 Termination Price:
	  	 USD 18.00

 3.           GS&Co.’s Contact Details for
Purpose of Giving Notice: 
 Goldman, Sachs & Co. 

200 West Street 

New York, NY 10282-2198 

Attention: Jason Lee, Equity Capital Markets 

Telephone: 212-902-0923 

Facsimile: 212-346-2126 

Email: jason.lee@gs.com 
  

 
 *** Indicates material has
been omitted pursuant to a Confidential Treatment Request filed with the Securities and Exchange Commission. A complete copy of this agreement has been filed separately with the Securities and Exchange Commission. 

  
 3 

 With a copy to: 

Attention: Jared Kramer, Equity Capital Markets 

Telephone: +1-212-902-3002 

Facsimile: +1-212-256-5847 

Email: jared.kramer@gs.com 

And email notification to the following address: 

Eq-derivs-notifications@am.ibd.gs.com 

4.           The Office of GS&Co. for the Transaction is: 200 West Street, New
York, NY 10282-2198. 
 5.           For purposes of the Transaction (i) the
words “, or if such price is not so reported on such Exchange Business Day for any reason or is, in the Calculation Agent’s reasonable determination, manifestly erroneous, such VWAP Price shall be as reasonably determined by the
Calculation Agent” shall be added immediately following “(or any successor thereto)” in the ninth line of the provision opposite “VWAP Price” in Section 1 of the Master Confirmation, (ii) Section 6.3(d) of the
Equity Definitions shall be amended by deleting the remainder of the provision following the term “Scheduled Closing Time” in the fourth line thereof, (iii) the words “the Hedge Period,” and “the Hedge Period Reference
Price,”, in each case, shall be deleted from each place such words appear in the provision opposite “Market Disruption Event” in Section 1 of the Master Confirmation, and (iv) the words “the Hedge Completion Date or the
Termination Date” shall be replaced with “the Scheduled Termination Date” in the eleventh and twelfth lines of the provision opposite “Market Disruption Event” in Section 1 of the Master Confirmation. 

6.           For purposes of the Transaction (i) the words “Hedge Period
and” shall be deleted from the third line of Section 4 of the Master Confirmation, (ii) the words “the Hedge Period or” shall be deleted from each place such words appear in Section 4(g) of the Master Confirmation,
(iii) the words “the Minimum Share Delivery Date” shall be deleted from the first line and the words “equal to the Maximum Shares” in the fifth line, in each case, of Section 4(i) of the Master Confirmation shall be
replaced with “with a value equal to the Prepayment Amount”, and (iv) the words “Hedge Period or” shall be deleted from the first line and the words “the Hedge Completion Date or” shall be deleted from the tenth
line, in each case, of Section 4(k) of the Master Confirmation. 

7.           For purposes of the Transaction (i) the words “, the Hedge
Period” shall be deleted from the eighth and ninth lines and the words “or the Hedge Completion Date or both, as the case may be,” shall be deleted from the ninth and tenth lines, in each case, of Section 5(a) of the Master
Confirmation, (ii) the words “the Hedge Period,” and “the Hedge Completion Date or”, in each case, shall be deleted in each place such words appear in Section 5(b) of the Master Confirmation, (iii) the words
“or both, as the case may be,” shall be deleted from the seventeenth line of Section 5(b) of the Master Confirmation, and (iv) the words “, the Hedge Period” shall be deleted from the first line of Section 5(c) of
the Master Confirmation. 
 8.           For purposes of the Transaction (i) the
words “purchasing Shares” in each of the fourth, eight and tenth lines of Section 5(b) of the Master Confirmation shall be replaced with “or limit any market activity”, (ii) the words “or extend” shall be
added immediately following the word “suspend” in the sixth line of Section 5(b) of the Master Confirmation, (iii) the words “or extended, as applicable,” shall be added immediately following the word
“suspended” in the second line of Section 5(c) of the Master Confirmation, and (iv) the words “or extension, as applicable,” shall be added immediately following the word “suspension” in the third line of
Section 5(c) of the Master Confirmation. 
 9.           For the avoidance of
doubt any adjustment under Section 9(d) of the Master Confirmation shall be made in a commercially reasonable manner. For purposes of the Transaction the words “and the Maximum Shares” shall be deleted from the second and third lines
and the words “the Hedge Period or” shall be deleted from the third line, in each case, of Section 9(d) of the Master Confirmation. 

  
 4 

 10.           For purposes of the
Transaction (i) the words “‘not less than the Minimum Shares and’ and ‘, but not below zero,’ were deleted from the definition thereof” shall be replaced with “‘minus the Forward Price Adjustment
Amount’ were deleted from the definition of Divisor Amount” in the second and third line of Section 10(a) of the Master Confirmation, (ii) “(A)” shall be added immediately following “(ii)” in the fourth line
of Section 10(b) of the Master Confirmation, and (iii) the words “or (B) consummation prior to the date three months following the Scheduled Termination Date of an Acquisition Transaction that is the subject of an Acquisition
Transaction Announcement occurring prior to the Actual Termination Date” shall be added immediately following the words “of Counterparty” in the eight line of Section 10(b) of the Master Confirmation. 

11.           For the avoidance of doubt, the amendment to the Equity Definitions set
forth in clause (i) of “Settlement Method Election” in Annex A to the Master Confirmation specifies that Counterparty may give irrevocable notice to GS&Co. of its election to have Cash Settlement or Net Share Settlement be
applicable to the Transaction to which this Supplemental Confirmation relates under the terms of such Annex A on or prior to the Settlement Method Election Date in a writing containing the representation and warranty mentioned in clause (ii) of
such “Settlement Method Election” provision, which representation and warranty is within Counterparty’s power to give at any time. 

12.           Counterparty represents and warrants to GS&Co. that neither it nor
any “affiliated purchaser” (as defined in Rule 10b-18 under the Exchange Act) has made any purchases of blocks pursuant to the proviso in Rule 10b-18(b)(4) under the Exchange Act during the four full calendar weeks immediately preceding
the Trade Date. 
 13.           For purposes of the Transaction and a determination
as to whether a Change in Law has occurred under Section 12.9(a)(ii) of the Equity Definitions, (i) any determination as to whether (A) the adoption of or any change in any applicable law or regulation (including, for the avoidance of
doubt and without limitation, (x) any tax law or (y) adoption or promulgation of new regulations authorized or mandated by existing statute) or (B) the promulgation of or any change in the interpretation by any court, tribunal or
regulatory authority with competent jurisdiction of any applicable law or regulation (including any action taken by a taxing authority), in each case, constitutes a “Change in Law” shall be made without regard to Section 739 of the
Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 or any similar legal certainty provision in any legislation enacted, or rule or regulation promulgated, on or after the Trade Date, and (ii) Section 12.9(a)(ii) of the
Equity Definitions is hereby amended by replacing the parenthetical beginning after the word “regulation” in the second line thereof the words “(including, for the avoidance of doubt and without limitation, (x) any tax law or
(y) adoption or promulgation of new regulations authorized or mandated by existing statute)”. 

14.           The Contracting Parties agree that, for the avoidance of doubt, for
purposes of Section 5(b)(i) of the Agreement, “any applicable law” shall include the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, any rules and regulations promulgated thereunder and any similar law or
regulation, without regard to Section 739 of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 or any similar legal certainty provision in any legislation enacted, or rule or regulation promulgated, on or after the Trade
Date, and the consequences specified in the Agreement, including without limitation, the consequences specified in Section 6 of the Agreement, shall apply to any Illegality arising from any such act, rule or regulation. 

15.           For purposes of the Transaction, Section 14 of the Master
Confirmation shall be replaced in its entirety with “Notwithstanding anything to the contrary herein, GS&Co. may, by prior notice to Counterparty, satisfy its obligation to deliver any Shares or other securities on any date due (an
‘Original Delivery Date’) by making separate deliveries of Shares or such securities, as the case may be, at more than one time on or prior to such Original Delivery Date, so long as the aggregate number of Shares and other
securities so delivered on or prior to such Original Delivery Date is equal to the number required to be delivered on such Original Delivery Date.” 

16.           For purposes of the Transaction, Section 17 of the Master
Confirmation shall not apply. 

  
 5 

 17.           For purposes of the
Transaction, notwithstanding anything to the contrary in Section 6 of the Agreement, an Additional Termination Event with Counterparty as the sole Affected Party and the Transaction as the Affected Transaction will automatically occur without
any notice or action by GS&Co. or Counterparty if the price of the Shares on the Exchange at any time falls below the Termination Price, and the Exchange Business Day that the price of the Shares on the Exchange at any time falls below the
Termination Price will be the “Early Termination Date” for purposes of the Agreement. 

18.           For the avoidance of doubt, there shall be no Trade Notification with
respect to the Transaction and all references in the Master Confirmation to a Trade Notification shall be disregarded. 

19.           For purposes of the Transaction (i) the words “‘not less
than the Minimum Shares’ and ‘, but not below zero’ were deleted from the definition of Number of Shares to be Delivered” shall be replaced with “‘minus the Forward Price Adjustment Amount’ were deleted from
the definition of Divisor Amount” in the provision opposite “Forward Cash Settlement Amount” in Section 1 of Annex A to the Master Confirmation, (ii) the words “the Exchange Business Day immediately following”
shall be added immediately following “(ii)” in the provision opposite “Settlement Method Election Date” in Section 1 of Annex A to the Master Confirmation and (iii) the words “the earlier of (i) the Scheduled
Termination Date or (ii) the Exchange Business Day immediately following” shall be added immediately prior to the words “the Termination Date,” in the provision opposite “Settlement Valuation Period” in Section 1
of Annex A to the Master Confirmation. 
 20.           GS&Co. agrees that, for
purposes of Section 7(a) of the Master Confirmation, it will enter into customary documentation with Counterparty, reasonably satisfactory to GS&Co., relating to open market purchases of Shares by GS&Co. as agent for Counterparty, so
long as the number of Shares so purchased on any day during the Relevant Period for the Transaction to which this Supplemental Confirmation relates shall not exceed 3% of ADTV (as defined in Rule 10b-18). 

21.           This Supplemental Confirmation may be executed in any number of
counterparts, all of which shall constitute one and the same instrument, and any party hereto may execute this Supplemental Confirmation by signing and delivering one or more counterparts. 

[Remainder of the Page Intentionally Left Blank] 

  
 6 

 Counterparty hereby agrees (a) to check this Supplemental Confirmation
carefully and immediately upon receipt so that errors or discrepancies can be promptly identified and rectified and (b) to confirm that the foregoing (in the exact form provided by GS&Co.) correctly sets forth the terms of the agreement
between GS&Co. and Counterparty with respect to this Transaction, by manually signing this Supplemental Confirmation or this page hereof as evidence of agreement to such terms and providing the other information requested herein and immediately
returning an executed copy to Equity Derivatives Documentation Department, facsimile No. 212-428-1980/83. 
  

			
	 Yours sincerely,

	
	GOLDMAN, SACHS & CO.
		
	By:	 	   /s/ Daniel Kopper

		 	   Name: Daniel Kopper

		 	   Title: Vice President

  

			
	 Agreed and accepted by:

	
	ASPEN INSURANCE HOLDINGS LIMITED
		
	 By:
	 	   /s/ John Worth

		 	   Name: John Worth

  Title: Group Chief Financial Officer

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