Document:

EX-10.28

 Exhibit 10.28 

FIRST AMENDMENT TO THE STOCKHOLDERS AGREEMENT 
 This FIRST AMENDMENT TO THE STOCKHOLDERS AGREEMENT, dated as of May 8, 2013 (this “Amendment”), is made by and among Allison Transmission Holdings, Inc., a Delaware corporation, and
each of the other signatories hereto. 
 W I T N E S S E T H: 

WHEREAS, the parties hereto have entered into that certain Amended and Restated Stockholders Agreement, dated as of March 12, 2012
(the “Stockholders Agreement”); 
 WHEREAS, Section 8.8(a) of the Stockholders Agreement provides that the
parties hereto may amend the Stockholders Agreement; and 
 WHEREAS, the parties hereto desire to amend the Stockholders
Agreement as set forth herein. 
 NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements
herein contained and other good and valuable consideration, the receipt, adequacy and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: 
 Section 1. Amendment to the Stockholders Agreement. The definition of “Restricted Management Stockholders” provided in Section 1.1 of the Stockholders Agreement is hereby
amended and restated in its entirety to read as follows: 
 “Restricted Management Stockholders” shall mean
Lawrence E. Dewey, David S. Graziosi, Michael G. Headly, Randall R. Kirk and David L. Parish. 
 Section 2.
Effectiveness of Amendment. Upon the execution and delivery hereof, the Stockholders Agreement shall thereupon be deemed to be amended and restated as hereinabove set forth as fully and with the same effect as if the amendment and restatement
made hereby was originally set forth in the Stockholders Agreement, and this Amendment and the Stockholders Agreement shall henceforth respectively be read, taken and construed as one and the same instrument. 

Section 3. General Provisions. 
 (a) Miscellaneous. This Amendment may be executed in one or more counterparts, all of which shall be considered one and the same agreement and shall become effective when one or more counterparts
have been signed by each of the parties hereto and delivered to the other parties hereto. This Amendment shall be governed by, construed, applied and enforced in accordance with the internal laws of the State of Delaware. 

 (b) Stockholders Agreement in Effect. Except as specifically provided for in this
Amendment, the Stockholders Agreement shall remain unmodified and in full force and effect. 
 First Amendment to Stockholders
Agreement 

 IN WITNESS WHEREOF, each of the parties hereto has caused this Amendment to be executed as
of the date first written above. 
  

			
	ALLISON TRANSMISSION HOLDINGS, INC.
		
	By: 	 	/s/ Lawrence E. Dewey
	 Name: Lawrence E. Dewey
 Title:   President and Chief Executive Officer

  

			
	 CARLYLE PARTNERS IV AT HOLDINGS, L.P.
 By: TC Group IV Managing GP, L.L.C., its general partner

		
	By: 	 	/s/ Brian A. Bernasek
	 Name: Brian A. Bernasek
 Title:   Authorized Person

  

			
	 ONEX ALLISON CO-INVEST LP
 By: Onex Partners II GP LP, its general partner
 By: Onex Partners Manager LP, its agent

By: Onex Partners Manager GP ULC, its general partner

		
	By: 	 	/s/ Robert M. Le Blanc
	 Name: Robert M. Le Blanc
 Title:   Senior Managing Director

		
	By: 	 	/s/ Donald F. West
	 Name: Donald F. West

Title:   Vice President and Secretary

  

			
	ONEX ALLISON HOLDING LIMITED S.Á R.L.
		
	By: 	 	/s/ Donald F. West
	 Name: Donald F. West

Title:   Type A Manager

		
	By: 	 	/s/ Olivier Dorier
	 Name: Olivier Dorier

Title:   Type B Manager

 First Amendment to Stockholders Agreement 

 
			
	 ONEX PARTNERS II GP LP
  

By: Onex Partners GP Inc., its general partner

		
	By: 	 	/s/ Robert M. Le Blanc
	 Name: Robert M. Le Blanc
 Title:   President

		
	By: 	 	/s/ Donald F. West
	 Name: Donald F. West

Title:   Vice President

  

			
	 ONEX PARTNERS II LP
 By: Onex Partners II GP LP, its general partner
 By: Onex Partners Manager LP, its agent

By: Onex Partners Manager GP ULC, its general partner

		
	By: 	 	/s/ Robert M. Le Blanc
	 Name: Robert M. Le Blanc
 Title:   Senior Managing Director

		
	By: 	 	/s/ Donald F. West
	 Name: Donald F. West

Title:   Vice President and Secretary

  

			
	ONEX US PRINCIPALS LP
		
	By: 	 	/s/ Donald F. West
	 Name: Donald F. West

Title:   Representative of the General Partner

  

			
	1597257 ONTARIO INC.
		
	By: 	 	/s/ Christopher A. Govan
	 Name: Christopher A. Govan
 Title:   Managing Director

		
	By: 	 	/s/ Andrea E. Daly
	 Name: Andrea E. Daly

Title:   Vice President and General Counsel

 First Amendment to Stockholders AgreementEX-10.1

 Exhibit 10.1 
 SEPARATION AGREEMENT 
 This SEPARATION AGREEMENT AND
WAIVER AND RELEASE OF ALL CLAIMS (hereinafter referred to as “Agreement”) is made this 25th day of July, 2013, by and between Paul Reynolds, including heirs, agents, and assigns (hereinafter collectively referred to as “Executive”), and Fifth Third Bancorp, Fifth Third Bank, including
either of their current and former affiliated or related corporate entities, trustees, agents, assigns, successors, owners, board members, officers, directors, employees, employee benefit plans and agents, attorneys, insurers, and reinsurers
(hereinafter collectively referred to as “the Company”). 
 WHEREAS, the parties desire to resolve all issues related
in any way to Executive’s employment with the Company and separation from the Company; 
 WHEREAS, Executive resigns his
offices of Executive Vice President, Secretary, and Chief Risk Officer at the Company as of July 26, 2013; 
 WHEREAS, the
material terms of this Agreement have been approved by the Compensation Committee of the Company’s Board; and 
 NOW,
THEREFORE, in consideration of the mutual promises herein contained, the parties agree as follows: 
 1. In exchange for the
promises and releases of Executive set forth in this Agreement, the Company agrees to pay Executive $1,683,000 (one million six hundred eighty-three thousand dollars) in a lump sum, less applicable deductions and for which a form W-2 shall be
issued. Executive acknowledges that the payments and promises contained in this Agreement are in exchange for Executive’s release, and are not otherwise owed to Executive under any policy, obligation or benefit plan of the Company. Executive
acknowledges that these payments fully satisfy all claims Executive might have against the Company, and Executive waives all 

 
right to interest under Ohio Rev. Code § 1343.03(A). Because the Company has determined that Executive is a “specified employee,” as defined under Section 409A of the Internal
Revenue Code of 1986 (the “Code”) and is considered to be owed to the Executive due to his separation from service, the Company shall make payment to Executive under this Agreement on the first business day after the six month period
following Executive’s separation from service (the projected payment date is January 27, 2014), provided Executive signed this Agreement and the releases contained herein have not been revoked, as specifically provided under this
Agreement. By signing this Agreement, Executive affirms and warrants that Executive has been paid and has received all leave (paid or unpaid), compensation, wages, bonuses, commissions, reimbursements, and benefits to which Executive may be entitled
and that no other leave (paid or unpaid), compensation, wages, vacation pay, paid time off, bonuses, commissions, reimbursements, or benefits are due to Executive. In addition, Executive affirms and warrants that Executive has no workplace injuries
or occupational diseases. 
 2. The Company further agrees that Executive will qualify as a retiree based upon age and years of
service as of July 26, 2013 for purposes of all long term incentive grants under the applicable Company incentive compensation plans provided to Executive while an employee and for purposes of the Company’s retiree health benefits.
Executive agrees that all other terms and conditions as provided by these long term incentive grants and the retiree health benefits plan remain in effect for each respective grant, except as specifically modified by this Agreement. 

3. If the Company determines that any of the payments or benefits provided for under this Agreement are subject to recoupment pursuant to
applicable law or regulation, the Company shall, promptly after making such a determination, send Executive a notice or recovery which shall specify the amount to be repaid to the Company and the terms for prompt repayment.

  
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In the event that the Company determines that any of the payments or benefits provided for under this Agreement are subject to recoupment pursuant to applicable law or regulation for reasons
other Executive’s misconduct or acts committed outside the scope of Executive’s employment, then this Agreement (including Executive’s release of claims) shall, at the option of Executive, be void, provided that Executive first
returns any requested recoupment payments to the Company. 
 4. Executive further agrees to respond in good faith to periodic,
but limited, inquiries from the Company through December 31, 2013 to assist the Company in its transition, provided such inquiries are of a factual nature and do not require Executive to provide legal advice, guidance, or opinions, or would
otherwise involve or constitute legal representation of the Company by Executive. 
 5. Executive fully and completely releases
the Company from any and all claims, liabilities, promises, agreements, lawsuits (including but not limited to claims for attorneys’ fees, costs, back pay, front pay, compensatory damages, and punitive damages). Executive’s release
includes but is not limited to claims of discrimination and harassment based upon race, national origin, ancestry, disability, religion, marital status, sexual orientation, gender identity, veteran’s status, sex, and age. Executive’s
release includes claims of retaliation and all claims under Title VII of the Civil Rights Act of 1964, as amended, 42 U.S.C. §§ 2000e et seq., the Rehabilitation Act of 1973, 29 U.S.C. §§ 701 et seq.,
the Reconstruction Era Civil Rights Acts, as amended, 42 U.S.C. §§ 1981 et seq., the Americans with Disabilities Act, 42 U.S.C. §§ 12101 et seq., the Age Discrimination in Employment Act (ADEA), 29 U.S.C.
§§ 621 et seq., the Family and Medical Leave Act, 29 U.S.C. §§ 2601, et. seq., the Worker Adjustment and Retraining Notification Act, 29 U.S.C. §§ 2100 et seq., the
Employee Polygraph Protection Act (EPPA), 29 U.S.C. §§ 2001, et seq., the Immigration Control and Reform Act, 8 U.S.C. § 1324b, the Fair Credit Reporting 

  
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Act (FCRA), 15 U.S.C. §§1681, et seq., the Genetic Information Non-Discrimination Act (“GINA”), 42 U.S.C. §§ 2000ff et. seq., the Ohio
Civil Rights Act, § 4112, et seq., the Ohio Workers Compensation Anti-Retaliation Act, § 4123.90, any statute in Ohio, that is related to any of the statutes listed in this paragraph, and any other federal, state, city, or
local statute or ordinance that can be released. This full and complete release shall also include claims for compensatory, punitive, liquidated or equitable damages and claims for all common law torts, breach of contract, promissory estoppel,
wrongful termination, violations of public policy, constructive discharge, and any other claims, which have been, could be or could have been asserted by Executive or on Executive’s behalf in any forum arising out of or connected with
Executive’s employment with the Company, and from all liability whatsoever, whether now known or unknown. Executive releases all claims for events or omissions occurring prior to the date of this Agreement, except that nothing in this Agreement
shall be construed to prevent Executive from filing or participating in a charge of discrimination filed with the EEOC or similar state or local administrative agencies. However, by signing this Agreement, Executive waives the right to recover any
monetary damages or attorneys’ fees from the Company in any claim or lawsuit brought by or through the EEOC or any other similar state or local agencies or anyone else representing or purportedly representing Executive’s interests against
the Company. 
 6. Executive additionally agrees to fully and completely release the Company from all claims under the Employee
Retirement Income Security Act (ERISA), 29 U.S.C. §§ 1001 et seq., the Ohio Whistleblower’s Act, § 4113.52, et seq., and the Sarbanes-Oxley Act, 18 U.S.C. § 1514A, et. seq. to
the maximum extent permitted by law and further releases all rights to lead or join a class or collective action against the Company. If any portion of this paragraph is held by a Court to be unenforceable, then the remainder of this Agreement shall
remain in full force and effect. 

  
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 7. Executive acknowledges that certain claims for alleged discrimination that Executive
might otherwise have desired to assert against the Company may depend in part on the identity or characteristics of the person, if any, selected by the Company to replace Executive, and although the identity of any such person may not yet be known,
Executive intends by this Agreement to release the Company from and waive all such claims. 
 8. It is understood and agreed
that by entering into this Agreement, the Company does not admit any violation of law, and that the Company has entered into this Agreement solely in the interest of resolving finally all claims and issues relating to Executive’s employment and
separation of employment with the Company. 
 9. Executive agrees to hold in strictest confidence and not disclose to anyone
other than Executive’s spouse, attorneys and tax advisers (after advising them to maintain confidentiality), the arrangements or agreements herein or any discussions leading to such arrangements or agreements. In light of this confidentiality
obligation, Executive shall not use as a witness to this Agreement anyone who is or has been employed by the Company or who is related to a person who is or has been employed by the Company. In the event that Executive is subject to a subpoena,
court order, or otherwise compelled to testify, appear, or provide information regarding the Company, if permitted by law, Executive will, within two business days after receipt, provide written notice to the Company to: Ms. Teresa Tanner,
Fifth Third Bank, 38 Fountain Square Plaza, MD 109053, Cincinnati, OH 45236. The Company acknowledges that this Agreement will be filed with the Securities and Exchange Commission and will become available to the public. 

10. If despite the full and complete release of claims contained in this Agreement, Executive still files a claim or claims in a lawsuit
against the Company for acts or omissions occurring before the signing of this Agreement under Title VII of the Civil Rights Act of 1964, 

  
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as amended, 42 U.S.C. §§ 2000e et seq., the Reconstruction Era Civil Rights Acts, as amended, 42 U.S.C. §§ 1981 et seq., the Americans with
Disabilities Act, 42 U.S.C. §§ 12101 et seq., or under any state statute or under state common law — and this Agreement is enforced — then Executive agrees to pay the Company its reasonable attorneys’ fees and
expenses in defending such a claim or claims brought by Executive. 
 11. Executive agrees to cooperate with the Company with
respect to any legal issue regarding any matter of which Executive had knowledge during employment with the Company. This cooperation includes appearance at depositions, assistance in responding to discovery demands, preparation for trials, and
appearance at trial, but does not include providing legal advice, guidance, or opinions or any action that would constitute legal representation of the Company by the Executive. If Executive is contacted by someone other than the Company concerning
any legal issue involving the Company, if permitted by law, Executive shall immediately notify the Company of such contact. Such notification shall be made to: Ms. Teresa Tanner, Fifth Third Bank, 38 Fountain Square Plaza, MD 109053,
Cincinnati, OH 45236. Nothing in this Agreement shall be construed as requiring the Executive to do anything other than be truthful in any testimony or communication in connection with any legal issue or any other matters involving or regarding the
Company. 
 12. Executive affirms and warrants that Executive has returned to the Company all property of the Company in
satisfactory condition (as well as any and all property leased to or owned by the Company), including but not limited to, all keys, credit or access cards, equipment, documents, copies of documents, materials, reports, drafts of reports, studies,
computer disks, customer contact information, blackberries, phones, PDA’s, laptops, computers, and all information stored in any electronic form. Executive understands and acknowledges that Executive will not be entitled to receive any of the
benefits under this Agreement unless all 

  
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property of the Company is returned to the Company in satisfactory condition on or before the execution of this Agreement. Executive further agrees that once electronic information is returned to
the Company, Executive will promptly delete and permanently destroy any electronic information of the Company remaining on the Executive’s computers or other electronic equipment. Finally, Executive will be permitted to retain his cell phone,
telephone number, and contact information contained on that cell phone, provided that Executive provides the cell phone to the Company so that the Company can erase all business-related information contained on the cell phone. 

13. Executive’s and the Company’s Confidential Information and Non-Solicitation Agreement shall remain in place, except as
follows: (i) Section II(a) shall not prevent Executive from the practice of law, provided that Executive abides by the remainder of the Confidential Information and Non-Solicitation Agreement; and (ii) Section II(a) shall not prevent
Executive from working for any other bank or financial institution, provided that Executive abides by the remainder of the Confidential Information and Non-Solicitation Agreement and provided that Executive does not consult with, become employed by,
or render services to PNC, US Bank, KeyBank, or Huntington Bank. Executive and the Company agree that the restrictions contained in Section II of the Confidential Information and Non-Solicitation Agreement shall expire on July 26, 2014.
Furthermore, if there is any conflict between the Confidential Information and Non-Solicitation Agreement and this Agreement, this Agreement shall prevail. Provided that Executive’s activities are in compliance with this paragraph, Executive
and the Company agree that Executive’s work in the financial services industry will not be deemed to violate the Award Agreements provided under the corresponding Company incentive compensation plan and listed on attached Exhibit 1 and shall
not affect the Executive’s status as a retiree for purposes of (i) the Long Term Incentives granted to Executive, and as discussed in paragraph 2.1(ii) of the 

  
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Company’s 2011 Incentive Compensation Plan; and (ii) Executive’s rights to participate in the Company’s Retiree Medical Plan. 

14. Executive agrees that this Agreement is the sole agreement between the parties, and all other agreements or negotiations leading up
to this Agreement shall not be considered enforceable for any reason, except for the following agreements which shall remain in place and as specifically modified by this Agreement: (i) the Confidential Information and Non-Solicitation
Agreement (as discussed above); and (ii) the Award Agreements provided under the corresponding Company incentive compensation plan and listed on attached Exhibit 1. The provisions of the Award Agreements that survive Executive’s employment
with the Company shall continue to be in full force and be binding. Moreover, this Agreement does not alter Executive’s right to indemnification by the Company, including any rights under Directors’ and Officers’ insurance coverage
for acts committed within the scope of employment. 
 15. Executive further agrees that true and accurate photocopies of this
Agreement shall be enforceable. Ohio law shall apply to any dispute involving or arising out of this Agreement that concern issues of state law. Any dispute between the Company and the Executive shall take place in the state or federal courts
located in Hamilton County, Ohio. 
 16. Executive agrees that the Company’s failure to enforce any provision of this
Agreement shall not be deemed a waiver. 
 17. Executive acknowledges that Executive has not relied upon any advice,
representations or warranties whatsoever concerning Executive’s tax obligations, liabilities and/or consequences of the settlement provisions provided under this Agreement or any of the benefits or payments provided under this Agreement, except
those provided by the Company’s Wealth Management & Private Banking Services. The Company acknowledges that Executive is a client of the Company’s Wealth Management & Private Banking Services, but Executive

  
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acknowledges that he has had the opportunity to obtain third-party advice concerning Executive’s tax obligations, liabilities, and/or consequences surrounding this Agreement. Executive
agrees that the Company is not liable for any tax advice discussed during the negotiations of this Agreement. This waiver does not include tax advice provided to the Executive as a client of the Company’s Wealth Management & Private
Banking Services. 
 18. Executive is advised to consult with an attorney concerning this Agreement, and Executive has been
given 21 days to consider this Agreement (although Executive is free to sign this Agreement before the 21 days has expired, if Executive chooses to do so). After signing this Agreement, Executive has 7 days to revoke this Agreement. If Executive
decides to revoke this Agreement during this 7 day period, Executive must do so in writing and by certified mail to: Ms. Teresa Tanner, Fifth Third Bank, 38 Fountain Square Plaza, MD 109053, Cincinnati, OH 45236. If Executive revokes this
Agreement during this 7 day period, the Company shall have no obligations to Executive under this Agreement, and this Agreement shall be null and void in all respects. 
 19. It is further agreed that neither this Agreement nor any part of this Agreement will be used (or admitted into evidence) in any legal proceeding, except: (i) to enforce this Agreement;
(ii) for use in workers’ compensation or unemployment proceedings; or (iii) to establish Executive’s affirmations or warranties contained in this Agreement. 

20. EXECUTIVE, BY SIGNING THIS AGREEMENT, UNDERSTANDS THAT EXECUTIVE HAS RELEASED ALL CLAIMS AGAINST THE COMPANY (AS DEFINED IN THIS
AGREEMENT), INCLUDING BUT NOT LIMITED TO CLAIMS UNDER THE AGE DISCRIMINATION IN EMPLOYMENT ACT, AND ALL CLAIMS TO REINSTATEMENT, DAMAGES, AND PAYMENT OF ATTORNEYS’ FEES. EXECUTIVE ACKNOWLEDGES THAT THE BENEFITS EXECUTIVE IS TO RECEIVE UNDER
THIS 

  
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AGREEMENT ARE BENEFITS TO WHICH EXECUTIVE IS NOT OTHERWISE ENTITLED. EXECUTIVE ENTERS INTO THIS AGREEMENT KNOWINGLY, VOLUNTARILY AND AFTER HAVING THE OPPORTUNITY TO CONSULT WITH COUNSEL AND TO
REVIEW THIS DOCUMENT IN ITS ENTIRETY. 
  

									
	 /s/ Paul
Reynolds                              7-25-2013
	  		  	/s/ Marc D.
Brandt                                        
                    7-25-13
	 Paul Reynolds
                                        
Date
	  		  	Witness	  	Date
				
	 Fifth Third Bancorp
	  		  		  	
				
	 By
	  	/s/Teresa J. Tanner                 
                   07/25/2013	  		  	/s/ Marc D.
Brandt                                        
                    7-25-13
	 Date
	  		  	Witness	  	Date
					
	 Its
	  	Chief Human Resources Officer	  		  		  	

  
 10 

 EXHIBIT 1 

 

											
	 Type
	  	Grant Date	 	  	Grant ID	  	Quantity	 
	 Restricted Stock Awards
	  	 	4/19/2011	  	  	2011RSAEXE	  	 	6,237	  
	 Restricted Stock Awards
	  	 	2/21/2012	  	  	MSPPMATCH	  	 	3,005	  
	 Restricted Stock Awards
	  	 	4/17/2012	  	  	2012RSAEXE	  	 	11,604	  
	 Restricted Stock Awards
	  	 	2/19/2013	  	  	MSPPMATCH	  	 	8,224	  
	 Restricted Stock Awards
	  	 	4/16/2013	  	  	2013CAT1RS	  	 	26,006	  
	 Performance Shares
	  	 	4/19/2011	  	  	2011PSA	  	 	17,832	  
	 Performance Shares
	  	 	4/17/2012	  	  	2012PSA	  	 	18,012	  
	 Performance Shares
	  	 	4/16/2013	  	  	2013PSA	  	 	19,517	  
	 Stock Appreciation Rights
	  	 	4/19/2004	  	  	2004SAR	  	 	45,000	  
	 Stock Appreciation Rights
	  	 	4/8/2005	  	  	2004SAR	  	 	46,154	  
	 Stock Appreciation Rights
	  	 	1/23/2006	  	  	2004SAR	  	 	30,000	  
	 Stock Appreciation Rights
	  	 	4/7/2006	  	  	2004SAR	  	 	35,550	  
	 Stock Appreciation Rights
	  	 	4/9/2007	  	  	2007SAR	  	 	33,333	  
	 Stock Appreciation Rights
	  	 	4/15/2008	  	  	2008SAREXE	  	 	46,154	  
	 Stock Appreciation Rights
	  	 	4/21/2009	  	  	2009SAREXE	  	 	80,000	  
	 Stock Appreciation Rights
	  	 	4/19/2011	  	  	2011SAREXE	  	 	95,238	  
	 Stock Appreciation Rights
	  	 	4/17/2012	  	  	2012SAREXE	  	 	118,203	  
	 Stock Appreciation Rights
	  	 	4/16/2013	  	  	2013CAT1SR	  	 	69,079

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