Document:

EX-10.92

 Exhibit 10.92 

AGREEMENT AND GENERAL RELEASE 

This Agreement and General Release (“Release”) is entered into by and between BRIAN H. McCURRIE
(“Mr. McCurrie”) and KOPPERS INC. (“Koppers”). 
 WHEREAS, Mr. McCurrie has been employed by
Koppers since October 13, 2003, most recently as Senior Vice President, Business Development; 
 WHEREAS,
Mr. McCurrie’s employment with Koppers will terminate on July 25, 2014; 
 WHEREAS, as the result of the termination
of his employment by Koppers, Mr. McCurrie is eligible for 114 weeks of his final base annual salary as severance pay under the terms of Section 8(c) of his Employment Agreement effective October 12, 2003, as thereafter amended
(the “Agreement”) provided that he signs a Release in a form acceptable to Koppers; 
 WHEREAS, Mr. McCurrie desires
to sign this Release and receive such severance pay and other severance benefits as specified herein; 
 WHEREAS, Koppers and
Mr. McCurrie wish also to resolve, finally and completely and with prejudice, and without judicial or administrative intervention, any and all other matters between them relating to Mr. McCurrie’s employment with Koppers, the terms
and conditions of that employment, and the termination of that employment; and 
 NOW, THEREFORE, in consideration of the above
recitals and the mutual promises and covenants set forth below, Mr. McCurrie and Koppers, each intending to be legally bound, agree as follows: 

SECTION 1 — TERMINATION OF EMPLOYMENT 

A. Termination of Employment: By his execution of this Release, Mr. McCurrie acknowledges that his employment with Koppers has been
irrevocably terminated effective July 25, 2014.  
 B. Investment Savings Plan/Other Compensation or Benefit Plans: After
July 25, 2014, Mr. McCurrie will cease to be eligible to make contributions, or receive contributions from Koppers, into the Employee Savings Plan of Koppers Inc. and Subsidiaries (the “401(k) Plan”), except that nothing in this
Release affects Mr. McCurrie’s eligibility to receive, upon the termination of his employment, the vested portion of his account balance under the 401(k) Plan in accordance with the terms of the 401(k) Plan. In addition, as of
July 26, 2014, Mr. McCurrie will cease to be eligible to participate in all other compensation or benefit plans or programs sponsored by Koppers including, but not limited to, the Travel Accident Insurance Plan of Koppers Inc. for Regular
Salaried Employees, the Koppers’ Executive Long Term Disability Plan, and the Koppers’ Salary Continuation Plan, except as otherwise specifically provided in this Release. Mr. McCurrie will also cease to be eligible, as of
July 26, 2014, for the payment by, or reimbursement from, Koppers for any club dues in connection with his membership at St. Clair Country Club, the Duquesne Club and any other dinner or social clubs to which he belongs. Finally,
Mr. McCurrie is not eligible to participate in either the Senior Management Corporate Incentive Plan, the Global CMC KVA Plan or any other applicable annual incentive plans for 2014 (collectively, the “2014 Annual Bonus Plans”). 

  
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 C. Long Term Incentive Plan: Pursuant to the terms of the Award Agreements under the Long
Term Incentive Plan, all of Mr. McCurrie’s outstanding unvested time-based and performance-based awards will be cancelled as of July 25, 2014. In addition, Mr. McCurrie’s outstanding unvested stock options will be cancelled
as of July 25, 2014. To the extent that Mr. McCurrie has outstanding vested stock options, the terms of such options shall continue to be governed by the provisions of the applicable Stock Option Award Agreement(s). 

D. Retirement & SERP Plans: Mr. McCurrie’s right to benefits under (i) the Retirement Plan of Koppers Inc. and
Subsidiaries for Salaried Employees, as amended, (ii) the Koppers Inc. Supplemental Executive Retirement Plan I, as amended, and (iii) the Koppers Inc. Supplemental Executive Retirement Plan II, as amended, shall be determined solely by
reference to the terms and conditions set forth in such plans and nothing contained herein is intended to or shall increase or decrease the benefits otherwise payable to Mr. McCurrie thereunder. 

E. Benefit Restoration Plan: Mr. McCurrie’s right to benefits under the Koppers Holdings Inc. Benefit Restoration Plan shall
be determined solely by reference to the terms and conditions set forth therein and nothing contained herein is intended to or shall increase or decrease the benefits otherwise payable to Mr. McCurrie thereunder. 

F. Vacation: Upon the termination of his employment with Koppers, Mr. McCurrie will be entitled to be paid for 33 days of unused
current and accrued vacation as of July 25, 2014. Such payment shall be made in accordance with Koppers’ applicable vacation and payroll policies. 

G. Company Property: Before accepting any monetary payment from Koppers pursuant to Section 2 below, Mr. McCurrie promises to
return to Koppers all files, memoranda, documents, records, electronic records, software, copies of the foregoing, credit cards, keys, cell phones, computers, iPads, and any other property of Koppers or any other Released Party in his possession.

 SECTION 2 — SEVERANCE PAY 

For purposes of this Release, the period from July 26, 2014, through September 30, 2016, will hereinafter be referred to as the
“Severance Pay Period.” 
 A. Severance Payment: During the Severance Pay Period and provided that
Mr. McCurrie signs and does not revoke this Release, Mr. McCurrie shall receive from Koppers periodic severance payments equal to his regular monthly salary of Thirty Two Thousand Eight Hundred Fifty Dollars ($32,850.00), less standard
deductions and tax withholdings required by law. Each monthly severance payment will be made by Koppers in two installments, consisting of a mid-month advance on the regular Koppers mid-month pay date and a final month-end payment on the regular
Koppers month-end pay date. Koppers’ total gross payment hereunder to Mr. McCurrie shall be eight hundred sixty-four thousand two hundred and eight dollars ($864,208), and Mr. McCurrie expressly acknowledges that said gross payment
constitutes severance pay being paid to him in installments during the Severance Pay Period. 

  
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 B. Benefits to Which Mr. McCurrie will be Eligible: During the Severance Pay Period,
Mr. McCurrie and, as may be applicable, his spouse and other eligible dependents, will continue to be covered under all group health insurance benefits substantially similar to those that Mr. McCurrie was receiving immediately prior to the
beginning of the Severance Pay Period, including without limitation the following plans of Koppers, provided that Mr. McCurrie elects to continue coverage and pays the employee share of premiums, where applicable, and provided, further, that
such benefits shall be reduced to the extent Mr. McCurrie or his spouse or other eligible dependents receive comparable benefits as the result of Mr. McCurrie being covered under another employer’s program of insurance benefits:
(i) Comprehensive Medical Benefits Plan of Koppers Inc. for Salaried Employees; (ii) Dental Expense Plan for Salaried Employees of Koppers Inc.; and (iii) Vision Plan. Coverage under these plans shall cease and forever terminate on
September 30, 2016, except as otherwise permitted by the continuation coverage provisions of the Consolidated Omnibus Budget Reconciliation Act (“COBRA”). The date of the “qualifying event” for purposes of Mr. McCurrie
electing, at his sole expense, continued health coverage under the Koppers sponsored health plan pursuant to the continuation coverage provisions of COBRA as the result of his termination shall be July 25, 2014. In addition, during the
Severance Pay Period and until September 30, 2016, Mr. McCurrie will continue to be covered under all life, disability, and accident (other than travel accident) insurance benefits substantially similar to those that Mr. McCurrie was
receiving immediately prior to the beginning of the Severance Pay Period, including without limitation the following insurance plans of Koppers, provided that Mr. McCurrie elects to continue coverage and pays the employee share of premiums,
where applicable, and provided, further, that such benefits shall be reduced to the extent that Mr. McCurrie or his spouse or eligible dependents receive comparable benefits as the result of Mr. McCurrie being covered under another
employer’s program of insurance benefits: (i) Group Life Insurance Plan of Koppers Inc. for Salaried Employees; (ii) the Koppers’ Executive Long Term Disability Plan; and (iii) the Koppers Accidental Death and Dismemberment
Plan. Coverage under these plans shall cease and forever terminate on September 30, 2016. In addition, Mr. McCurrie may continue to participate in the Koppers Flexible Benefits Plan for the 2014 Plan year, after which his participation
will cease and terminate. Mr. McCurrie understands and agrees that Koppers has the right to terminate, freeze, or otherwise amend any of the foregoing Plans whereupon Mr. McCurrie or his spouse or other eligible dependents shall have no
greater right to benefits than other senior-management level participants (or their eligible spouses or dependents) in said Plans. Should Mr. McCurrie become covered by another employer-sponsored health or insurance plan at any time prior to
the last scheduled severance payment he receives under paragraph A above, Mr. McCurrie agrees to notify Koppers in writing within 10 days of such event. 

C. Indemnification/Directors and Officers Liability Insurance: Koppers’ obligations to indemnify and defend Mr. McCurrie with
respect to matters arising out of Mr. McCurrie’s performance during his employment with Koppers shall continue after Mr. McCurrie’s termination to the same extent that they existed prior to such termination. Koppers will, at all
times, maintain in force and effect Directors and Officers Liability Insurance with respect to Mr. McCurrie’ employment with Koppers. 

  
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 D. Accrued Obligations: Within five days following the date of Mr. McCurrie’s
termination of employment with Koppers, Koppers shall pay Mr. McCurrie his full base salary earned through the date of such termination, plus all other amounts to which Mr. McCurrie is entitled under any incentive, bonus or other
compensation plan of Koppers, at the time such payments are due. 
 E. Sufficiency of Consideration: Mr. McCurrie expressly
acknowledges that, during the Severance Pay Period and otherwise, he shall not receive any payment or benefit from Koppers other than those specified above and that Koppers shall not be required to make any further payment or provide any further
benefit to him or on his behalf, for any reason whatsoever, either during the Severance Pay Period or thereafter. Mr. McCurrie acknowledges and agrees that Koppers’ undertakings are significantly and substantially in addition to those
benefits to which Mr. McCurrie was or is otherwise entitled, and Mr. McCurrie acknowledges that these undertakings by Koppers are adequate consideration for all terms and covenants, including those in Section 4 below, contained in
this Release. 
 Section 3 — Complete Release 

A. In General: Mr. McCurrie agrees to irrevocably and unconditionally release any and all Claims he may now have against Koppers
and the Released Parties as set forth in this Section 3. 
 B. Released Parties: The Released Parties are Koppers, Koppers
Holdings Inc., and their related Koppers entities and, with respect to each of them, their predecessors and successors; all of their employees, officers, directors, agents, insurers, employee benefit plans, funds, programs, or arrangements providing
pension, welfare, and fringe benefits; and their successors and/or assigns, jointly and individually. 
 C. Claims Released:
Mr. McCurrie understands and agrees that he is releasing all known and unknown claims, promises, causes of action, or similar rights of any type that he may have (the “Claims”) against any Released Party arising out of or in any way
related to his employment with Koppers, the terms and conditions of his employment with Koppers, the termination of his employment with Koppers, and the continuing effects thereof. Mr. McCurrie further understands that the Claims he is
releasing may arise under many different laws and under any possible legal, equitable, statutory, contractual, or tort theory, including, but by no means limited to: 

1. Anti-discrimination statutes, such as all Claims under any federal, state, or local law, statute, ordinance,
regulation, or executive order that prohibits employment discrimination, harassment, or retaliation based on religion, national origin, ancestry, marital status, sex, sexual orientation, age, race, color, handicap, disability, retaliation, or any
other characteristic proscribed by law or activity protected by law, including but not limited to the Age Discrimination in Employment Act of 1967; the Older Workers Benefit Protection Act; Title VII of the Civil Rights Act of 1964; the Civil Rights
Act of 1991, 42 U.S.C. §1981; the Equal Pay Act; the Americans with Disabilities Act; the Pennsylvania Human Relations Act; the Pittsburgh City Code, and any other federal, state, or local law, and any amendments thereto, that prohibits
employment discrimination, harassment or retaliation of any kind. 

  
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 2. Federal, state, and local employment statutes, such as all Claims under
the Employee Retirement Income Security Act of 1974, which, among other things, protects employee benefits; all Claims under the Family and Medical Leave Act of 1993, which requires employers to provide leaves of absence under certain circumstances;
and all Claims under any law that restricts an employer’s right to terminate employees or otherwise regulates employment, including but not limited to whistleblower laws. 

3. Tort and Contract Claims, such as all Claims of wrongful or constructive discharge, physical or personal injury,
emotional distress, fraud, fraud in the inducement, negligent misrepresentation, defamation, invasion of privacy, interference with contract or with prospective economic advantage, breach of express or implied contract, and breach of covenants of
good faith and fair dealing; and all similar or related Claims. 
 4. Other examples of released Claims, include, but
are not limited to all Claims for compensation, bonuses, cash awards, lost wages, vacation pay or sick pay; all Claims for short-term or long-term disability benefits;
all Claims for severance or separation pay or benefits under the Koppers Inc. Severance Pay Plan for Salaried Employees or otherwise; and all Claims for attorneys’ fees or other indemnities. 

Mr. McCurrie understands that he is releasing Claims that he may not know about. It is his knowing and voluntary intent to release such Claims, even
though he recognizes that someday he might learn that some or all of the facts he currently believes to be true are untrue and even though he might then regret having signed this Release. Nevertheless, Mr. McCurrie is assuming that risk and
agrees that this Release shall remain effective in all respects in any such case. Mr. McCurrie expressly waives all rights he might have under any law that is intended to protect him from waiving unknown claims and he understands the
significance of doing so. Mr. McCurrie also covenants that, to his knowledge, he has not sustained any work-related injury during his employment at Koppers. 

D. Rights Not Released: Mr. McCurrie does not waive, nor shall this Release be construed to waive, any right which is not subject
to waiver as a matter of law, or any right which arises after the Effective Date of this Release. 
 SECTION 4 —
MR. MCCURRIE’S PROMISES 

A. Pursuit of Released Claims: Mr. McCurrie represents that he has not filed or caused to be filed, and agrees that he will not
file or cause to be filed, any lawsuit of any kind arising out of or relating to his employment with Koppers, the terms and conditions of that employment, or the termination of his employment. This Release does not prohibit Mr. McCurrie from
filing an administrative charge of alleged employment discrimination, harassment, or retaliation under Title VII of the Civil Rights Act of 1964, the Age Discrimination in Employment Act of 1967, the Americans with Disabilities Act of 1990, or
the Equal Pay Act of 1963; however, Mr. McCurrie represents that he has not to date filed or caused to be filed any such administrative charge and, further, agrees that he hereby waives any right to monetary or other recovery should any
federal, state, or local administrative agency pursue any claim on his behalf. This means that by signing this Release, Mr. McCurrie has waived any right he had to obtain a recovery if an administrative agency pursues a

  
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claim against Koppers or any of the Released Parties based on any action taken by Koppers or any of the Released Parties up to the Effective Date of this Release and that he will have released
Koppers and the Released Parties of any and all claims, and the continuing effects of any and all claims, of any nature arising up to the Effective Date of this Release. 

B. Non-admission of Liability: Mr. McCurrie agrees that Koppers’ entry into this Release is not to be construed as, and is
not, an admission that Koppers violated any of its duties or obligations to him or treated him improperly, unlawfully, or unfairly in any manner whatsoever. Neither this Release nor the implementation thereof shall be construed to be, or shall be
admissible in any proceedings as, evidence of an admission by Koppers of any violation of or failure to comply with any federal, state, or local law, common law, agreement, rule, regulation, or order. 

C. Non-Disparagement: Mr. McCurrie agrees not to make any disparaging statements about Koppers or any Released Party to any of
Koppers’ past, present or future customers, employees, clients, contractors, suppliers, or to the media or to any other person either orally or by any other medium of communication, including Internet communication. Koppers agrees that no
officer or director of Koppers shall make any disparaging statements about Mr. McCurrie to any of Koppers’ past, present or future customers, employees, clients, contractors, suppliers, or to the media or to any other person either orally
or by any other medium of communication, including Internet communication. As used herein, the term “disparaging statement” means any communication, oral or written, which would cause or tend to cause humiliation or embarrassment or to
cause a recipient of such communication to question the business condition, integrity, products, services, quality, confidence or good character of Mr. McCurrie, Koppers or any Released Party. 

D. Covenants in Agreement: Mr. McCurrie hereby reaffirms his obligations to comply in all respects with the covenants and agreements
set forth in Section 6 of the Agreement, and that such covenants and agreements survive the termination of the Agreement and his employment. Mr. McCurrie acknowledges and agrees that such covenants were entered into in order to induce
Koppers to employ him and that his employment by Koppers was full and sufficient consideration to him for such covenants. He agrees further that the severance payments and benefits provided hereunder serve as additional consideration to support such
covenants. NOTHING CONTAINED IN THIS PARAGRAPH OR IN THIS AGREEMENT IS INTENDED OR SHALL BE CONSTRUED TO MODIFY IN ANY RESPECT THE FORFEITURE PROVISIONS SET FORTH IN THE KOPPERS INC. SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN I OR II, AS AMENDED.

 SECTION 5 — REVIEW AND REVOCATION

 A. Review: Mr. McCurrie acknowledges and agrees that his waiver of rights under this Release is knowing and voluntary and
complies in full with all criteria set forth under the Pennsylvania Human Relations Act, and further complies in full with all criteria set forth in the regulations promulgated under the Age Discrimination in Employment Act, the Older Workers
Benefit Protection Act, Title VII of the Civil Rights Act of 1964, and any and all federal, state, and local laws, regulations, and orders. Mr. McCurrie expressly warrants that he is advised hereby in writing of his right to consult with
an attorney prior to executing this Release. Mr. McCurrie further expressly 

  
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warrants that he has had the opportunity to consult with, and to be advised by, an attorney before executing this Release to help him fully understand and appreciate its legal effect.
Mr. McCurrie acknowledges that he has been afforded the opportunity to consider this Release up to and including August 18, 2014, which is a period of over 21 days. Mr. McCurrie may decide to sign this Release prior to the expiration
of the aforesaid period; however, it may not be signed by him prior to the day (July 26, 2014) after his last day of employment with Koppers. Mr. McCurrie agrees, pursuant to 29 C.F.R. Section 1625.22(e)(4), that any changes made to this
Release after the date he receives it and before the date he signs it, are immaterial and will not restart the running of the statutory period in which to consider this Release. 

B. Delivery: Mr. McCurrie shall cause the delivery of the executed Counterparts of this Release to be made by August 18,
2014, to Koppers Inc., Attention: Steven R. Lacy, 436 Seventh Avenue, Pittsburgh, PA 15219. This Release shall be void and of no effect if the signed Counterparts are not delivered to Mr. Lacy at the aforesaid address by August 18, 2014.
This Release shall also be void and of no effect if the Counterparts are signed by Mr. McCurrie prior to July 26, 2014, and delivered to Mr. Lacy prior to July 26, 2014. 

C. Revocation: Mr. McCurrie shall have a period of seven (7) days following his execution of this Release to revoke it, and
this Release shall not be effective or enforceable prior to the expiration of that period. Revocation can be made by delivering a written notice to Koppers Inc., Attention: Steven R. Lacy, 436 Seventh Avenue, Pittsburgh, PA 15219 (at fax #
412-227-2333). The revocation of this Release by Mr. McCurrie will automatically revoke the terms described in Section 2 above. If Mr. McCurrie does not advise Koppers in writing that he revokes this Release within seven days of his
execution of it, this Release shall be forever enforceable. The eighth day following Mr. McCurrie’s execution of this Release shall be deemed the Effective Date of this Release. 

SECTION 6 — MISCELLANEOUS 

A. Entire Agreement: Mr. McCurrie understands and agrees that the terms and conditions of this Release constitute the full and
complete understandings, agreements, and promises between him and Koppers with respect to all matters covered by this Release, that the terms and conditions of this Release cancel and supersede any prior understandings or agreements that may have
been between Mr. McCurrie and Koppers with respect to all matters covered by this Release except as otherwise provided herein, and that no other promise or inducement has been offered to him except as set forth herein. For the avoidance of
doubt, Mr. McCurrie understands and agrees that this Release supersedes the Agreement, except for the covenants and agreements set forth in Section 6 of the Agreement, which are incorporated herein by reference. 

B. Amendment: This Release may not be amended, modified, waived, or cancelled except by a writing signed by each party hereto. No
waiver of any provision of this Release shall be effective as against the waiving party unless such waiver is in writing and signed by the waiving party. 

C. Severability/Interpretation: If any term, condition, clause, or provision of this Release shall be determined by a court of
competent jurisdiction to be void or invalid at law, or for any other reason, then only that term, condition, clause, or provision, as is determined to be void or invalid, 

  
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shall be stricken from this Release, and this Release shall remain in full force and effect in all other respects. This Release shall be governed by the statutes and common law of the
Commonwealth of Pennsylvania. 
 D. Compliance with Section 409A: It is the intent of the parties that the severance benefits
provided under Section 2 shall, to the maximum extent possible, qualify for the short term deferral exception, the separation pay plan exception or other applicable exception under Section 409A of the Internal Revenue Code of 1986, as
amended, including the applicable regulations (“Section 409A”), so that none of the payments and benefits will result in adverse tax consequences, including tax penalties under Section 409A. Any ambiguities in the Release will be
interpreted to comply with this intent. Each severance benefit and each installment of a severance payment or benefit shall be deemed a separate payment under this Release. Each payment under this Release is intended to be treated as one of a series
of separate payments for purposes of Section 409A. The severance payments due to Mr. McCurrie under Section 2.A. of this Release are payable to him under Section 8(c) of the Agreement, which payments were only due upon an
involuntary termination within the meaning of Section 409A. If Mr. McCurrie would be entitled to a payment during the six month period beginning on the effective date of his termination that is not otherwise excluded under
Section 409A under the exception for short-term deferrals, separation pay arrangements, reimbursements, in-kind distributions, or any otherwise applicable exemption, the payment will not be made to Mr. McCurrie until the earlier of the six
month anniversary of the effective date of his termination or his death and will be accumulated and paid on the first day of the seventh month following the effective date of termination. Notwithstanding any provision of this Release to the
contrary, in no event shall the timing of Mr. McCurrie’s execution of this Release, directly or indirectly, result in Mr. McCurrie designating the calendar year of payment, and if a payment under this Release is payable within 60 days
after the date of termination and is considered deferred compensation under Section 409A, the payment shall be made on the 60th day after the date of termination. Notwithstanding the foregoing, if any provision of this Release needs to be
revised or if any correction needs to be undertaken in order to satisfy the requirements of Section 409A, then such provision shall be modified or restricted or such correction shall be undertaken by Koppers to the extent and in the manner
necessary to be in compliance with all applicable requirements of the Internal Revenue Code, provided that any such modification or correction shall be undertaken in a manner that maintains the same economic results as those intended under the
Agreement and this Release. 
 E. Successors: This Release binds Mr. McCurrie, his heirs, administrators, representatives,
executors, successors, and assigns, and will inure to the benefit of all Released Parties and their respective heirs, administrators, representatives, executors, successors, and assigns. 

F. Counterparts: This Release may be signed in two counterparts, each of which shall be deemed an original when signed and shall
constitute the same instrument. Koppers shall retain Counterpart No. 1 of this Release and Mr. McCurrie shall retain Counterpart No. 2 of this Release. 

  
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 Mr. McCurrie acknowledges that he has carefully read the foregoing Release, that he understands completely
its contents, that he understands the significance and consequence of signing it, and that he intends to be legally bound by its terms. Mr. McCurrie further acknowledges that he has had a reasonable and sufficient period of time within which to
consider this Release and that he has had the opportunity to review this Release with counsel. Mr. McCurrie swears that he has agreed to and signed this Release voluntarily and as his own free will, act, and deed, and for full and sufficient
consideration. 
 IN WITNESS WHEREOF, BRIAN H. McCURRIE and KOPPERS INC. have executed this Confidential Agreement and General
Release on the dates set forth below. 
  

									
	 /s/ Brian H. McCurrie
	 		 	KOPPERS INC.
	BRIAN H. McCURRIE	 		 		 	
					
	Date:	 	 7/29/14
	 		 	By:	 	 /s/ Steven R. Lacy

					
		 		 		 	Title:	 	 Senior Vice President, Administration, General Counsel and Secretary

					
		 		 		 	Date:	 	 7/29/14

  
 9/9EX-10.93

 Exhibit 10.93 

KOPPERS INC. 

SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN II 

Amended and Restated as of 

August 6, 2014 

 TABLE OF CONTENTS 
  

							
	 	 	 	  	Page	 
			
	 ARTICLE I
	 	 GENERAL
	  	 	1	  
			
	 Section 1.1
	 	 Effective Date; Grandfathered Benefits
	  	 	1	  
	 Section 1.2
	 	 Intent
	  	 	1	  
			
	 ARTICLE II
	 	 DEFINITIONS AND USAGE
	  	 	2	  
			
	 Section 2.1
	 	 Definitions
	  	 	2	  
	 Section 2.2
	 	 Usage
	  	 	5	  
			
	 ARTICLE III
	 	 ELIGIBILITY AND PARTICIPATION
	  	 	6	  
			
	 Section 3.1
	 	 Eligibility
	  	 	6	  
	 Section 3.2
	 	 Participation
	  	 	6	  
	 Section 3.3
	 	 Plan Frozen
	  	 	6	  
			
	 ARTICLE IV
	 	 RETIREMENT BENEFITS
	  	 	7	  
			
	 Section 4.1
	 	 Normal Retirement Benefit
	  	 	7	  
	 Section 4.2
	 	 Early Retirement Benefit
	  	 	8	  
	 Section 4.3
	 	 Termination of Employment
	  	 	9	  
	 Section 4.4
	 	 Disability
	  	 	9	  
	 Section 4.5
	 	 Death
	  	 	9	  
	 Section 4.6
	 	 Vesting and Forfeiture of Retirement Benefit
	  	 	9	  
			
	 ARTICLE V
	 	 PAYMENT OF RETIREMENT BENEFITS
	  	 	11	  
			
	 Section 5.1
	 	 Distribution of Retirement Benefits
	  	 	11	  
	 Section 5.2
	 	 Designation of Beneficiary
	  	 	12	  
			
	 ARTICLE VI
	 	 CHANGE IN CONTROL
	  	 	13	  
			
	 Section 6.1
	 	 “Change in Control” Defined
	  	 	13	  
	 Section 6.2
	 	 Vesting Upon Change in Control
	  	 	13	  
			
	 ARTICLE VII
	 	 ADMINISTRATION
	  	 	14	  
			
	 Section 7.1
	 	 General
	  	 	14	  
	 Section 7.2
	 	 Administrative Rules
	  	 	14	  
	 Section 7.3
	 	 Duties
	  	 	14	  
	 Section 7.4
	 	 Fees
	  	 	14	  
			
	 ARTICLE VIII
	 	 CLAIMS PROCEDURE
	  	 	15	  
			
	 Section 8.1
	 	 General
	  	 	15	  
	 Section 8.2
	 	 Denials
	  	 	15	  
	 Section 8.3
	 	 Notice
	  	 	15	  
	 Section 8.4
	 	 Appeals Procedure
	  	 	15	  
	 Section 8.5
	 	 Review
	  	 	15	  
	 Section 8.6
	 	 Arbitration of Disputes
	  	 	15	  

  
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 TABLE OF CONTENTS 

 

							
	 	 	 	  	Page	 
			
	 ARTICLE IX
	 	 MISCELLANEOUS PROVISIONS
	  	 	17	  
			
	 Section 9.1
	 	 Amendment and Termination
	  	 	17	  
	 Section 9.2
	 	 No Assignment
	  	 	17	  
	 Section 9.3
	 	 Successors and Assigns
	  	 	17	  
	 Section 9.4
	 	 Governing Law
	  	 	17	  
	 Section 9.5
	 	 No Guarantee of Employment
	  	 	17	  
	 Section 9.6
	 	 Severability
	  	 	17	  
	 Section 9.7
	 	 Notification of Addresses
	  	 	17	  
	 Section 9.8
	 	 Bonding
	  	 	18	  
	 Section 9.9
	 	 Taxes
	  	 	18	  
	 Section 9.10
	 	 Compliance with Section 409A
	  	 	18	  
			
	 ARTICLE X
	 	 FUNDING
	  	 	19	  
			
	 Section 10.1
	 	 Employer Liability
	  	 	19	  
	 Section 10.2
	 	 Unfunded Plan
	  	 	19	  
	 Section 10.3
	 	 Trust
	  	 	19	  

  
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 KOPPERS INC. 

SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN II 

PREAMBLE 
 Koppers Inc. (the
“Company”) recognizes that the Internal Revenue Service limitations on compensation that may be taken into account for purposes of determining retirement benefits under a retirement plan qualified under Section 401(a) of the Internal
Revenue Code may prevent some key employees from realizing sufficient benefits from the Company’s qualified retirement plan. The purpose of the Koppers Inc. Supplemental Executive Retirement Plan II (formerly named the Koppers Industries, Inc.
Supplemental Executive Retirement Plan II) is to acknowledge and reward certain key employees of the Company for their efforts on behalf of the Company by providing additional post employment income to such key employees in order to facilitate their
attainment of adequate levels of retirement income. 
 ARTICLE I 

GENERAL 

Section 1.1 Effective Date; Grandfathered Benefits. The original effective date of the Plan was December 1, 1997 and
the Plan was subsequently amended and restated, effective as of January 1, 2009. The Plan as amended and restated as of such date applies only to a Participant’s Retirement Benefit that accrued on or after January 1, 2005, or
Retirement Benefit that accrued prior to that date but was not fully vested on December 31, 2004. The Plan preceding such amendment and restatement applies to any Retirement Benefit that accrued and was vested prior to January 1, 2005
(“Grandfathered Benefits”); provided that any increase in the value of any subsidy with respect to Grandfathered Benefits payable upon retirement prior to the Retirement Plan’s Normal Retirement Date that accrues or increases as the
result of service after December 31, 2004, shall not be treated as Grandfathered Benefits. The rights, if any, of any person whose status as an employee of an Employer has terminated shall be determined pursuant to the Plan as in effect on the
date such employee terminated, unless a subsequently adopted provision of the Plan is made specifically applicable to such person. Notwithstanding the foregoing, the Plan is hereby restated to clarify the intended meaning of the Plan’s early
retirement date definition and early retirement benefit provisions, with such clarification being effective as of the Plan’s original effective date. 

Section 1.2 Intent. The Plan is intended to be an unfunded plan maintained primarily for the purpose of providing deferred
compensation for a select group of management or highly compensated employees, as such group is described under Section 201(2), 301(a)(3), and 401(a)(1) of ERISA. Benefits provided under this Plan shall be funded solely from the general assets
of the Employer and no participant or beneficiary hereunder shall have any interest or right to such assets. 

  
 1 

 ARTICLE II 

DEFINITIONS AND USAGE 

Section 2.1 Definitions. Wherever used in the Plan, the following words and phrases shall have the meaning set forth below
unless the context plainly requires a different meaning: 
 “Actuarial Equivalent” means a benefit having the same
actuarial value as the benefit it replaces, determined using the same assumptions and methods as are used for determining an actuarial equivalent benefit under the Retirement Plan. 

“Accumulated Service” means Accumulated Service as defined in the Retirement Plan. 

“Administrator” means the Pension Committee appointed by the Board, or such other person or persons as designated by the
Board. 
 “Board” means the Board of Directors of the Company. 

“Change in Control” means a change in the ownership or control of the Company, as defined in Section 6.1. 

“Code” means the Internal Revenue Code of 1986, as amended from time to time. Any reference to a particular Code section
shall include any provision which modifies, replaces or supersedes it. 
 “Company” means Koppers Inc and any successor
entity, and any entity that acquires ownership or control of Koppers Inc. or any successor entity. 
 “Disability” or
“Disabled” means a physical or mental condition of a Participant resulting from a bodily injury, disease, or mental disorder which renders him incapable of continuing in the employment of the Employer. Such Disability shall be
determined by the Administrator, in its sole and complete discretion, based upon appropriate medical advice and examination, and taking into account the ability of the Participant to continue in his or her same or similar, position with the
Employer. 
 “Early Retirement Date” means the date on which a Participant retires from employment with the Employer after
becoming eligible for an early retirement benefit under the Salaried Plan thereunder by reason of having (1) reached the age of 55 and completed 10 years of Accumulated Service, or (2) in the case of a Participant who has been
Involuntarily Terminated on or after January 1, 1998 (other than a Participant who has ceased to be an active employee performing his or her normal job function but who is accruing benefits pursuant to a severance arrangement or employment
contract with the Company), completed 30 years of Accumulated Service. 
 “Employer” means the Company and any other entity
related to the Company in a manner described in Sections 414(b), (c), (m) or (o) of the Code. 

  
 2 

 “ERISA” means the Employee Retirement Income Security Act of 1974, as amended
from time to time. Any reference to a particular ERISA section shall include any provision which modifies, replaces, or supersedes it. 

“Final Average Pay” means, with respect to any Participant, the sum of the following amounts: (i) the highest monthly
base salary (excluding bonuses and other variable payments) paid in his or her last sixty (60) calendar months of full-time employment with the Employer multiplied by twelve (12); provided, however, that if a Participant has fewer
than sixty (60) calendar months of full-time employment with the Employer, there shall be used in this clause the average of his or her regular base salary (excluding bonuses and other variable payments) during all of his or her calendar months
of full-time employment with the Employer; plus (ii) the average incentive payment made for the last five (5) years of employment. 

“Involuntarily Terminated” means any termination of a Participant’s employment with an Employer by reason of the
discharge, firing or other involuntary termination of the Participant’s employment by action of such Employer, other than a Termination for Cause (as determined in good faith by the Administrator). 

“Normal Form” means the normal form of distribution of the Participant’s Retirement Plan Benefit (i.e., a single life
annuity for an unmarried Participant or a joint and 50% survivor annuity for a married Participant). 
 “Normal Retirement
Age” means the age 65, or such other age that is defined from time to time as the normal retirement age under the Retirement Plan. 

“Normal Retirement Date” means the date on which a Participant attains the Normal Retirement Age. 

“Participant” means an eligible employee of an Employer who is participating in the Plan in accordance with Section 3.2. 

“Plan” means the Koppers Inc. Supplemental Executive Retirement Plan II, as set forth herein and as it may be amended from
time to time. 
 “Plan Year” means the calendar year. 

“Qualified Plan” means the Retirement Plan and any other defined benefit pension plan(s) (within the meaning of
Section 414(j) of the Code) intended to be qualified under Section 401(a) of the Code adopted and maintained by the Employer that provides benefits to Participants in this Plan. 

“Qualified Plan Benefit” means the annuity annual equivalent benefit, expressed in the form of the annuity payable to a
Participant under Section 5.1 hereof, that can be derived from the Qualified Plan. The determination of such annuity annual equivalent benefit shall be made using the mortality table that is in effect at such time for the Retirement Plan, an
interest rate 

  
 3 

 
equal to the interest rate used under FAS 87 for the Retirement Plan for the previous year, and a commencement age under the Qualified Plan that is the same age at which the Retirement Benefit is
to commence hereunder, in accordance with procedures established by the Administrator. 
 “Retirement Benefit” means the
benefit payable under this Plan, as determined under Article IV. 
 “Retirement Plan” means the Retirement Plan for Koppers
Inc., as subsequently amended and restated from time to time hereafter. 
 “Retirement Plan Benefit” means the benefit
payable to a Participant under the Retirement Plan. 
 “Separation from Service” means a Participant’s separation from
service with the Employer within the meaning of Section 409A of the Code. A Separation from Service occurs when the facts and circumstances indicate that the Employer and the Participant reasonably anticipate that no further services would be
performed after a certain date or that the level of services the Participant would perform after such date would permanently decrease to no more than 20% of the average level of services performed over the immediately preceding 36-month period (or,
if shorter, the entire period of the Participant’s employment with the Employer). 
 “Social Security Benefit” means
the annual benefit payable under the Social Security Act at the Participant’s Social Security Retirement Age, relating to Old-Age and Disability benefits, determined under the provisions of the Social Security Act in effect on the date of a
Participant’s Separation from Service. The Social Security Benefit will be calculated assuming that a Participant will not receive any future income that would be treated as wages for purposes of such Act, except that in the case of any
deferred vested Retirement Benefit payable under Section 4.3, the Social Security Benefit will be calculated assuming that the Participant will receive the maximum amount of future income that would be treated as wages for purposes of the
Social Security Act from the date of his or her Separation from Service until the Social Security Retirement Age. 
 “Social
Security Normal Retirement Age” means the age used as the retirement age under Section 216(1) of the Social Security Act, as amended. 

“Specified Employee” has the meaning set forth in Section 1.409A-1(i) of the Treasury Regulations issued under
Section 409A of the Code. 
 “Termination for Cause” means the termination of a Participant’s employment due to
(a) the willful and continued failure by the Participant to substantially perform his or her duties of employment (other than any such failure resulting from incapacity due to physical or mental illness) or any such actual or anticipated
failure after the issuance of a notice of termination, after a written demand for substantial performance is delivered to the Participant by the Board, which demand specifically identifies the manner in which the Board believes that the Participant
has not substantially performed his or her duties, and the Participant is given a reasonable 

  
 4 

 
opportunity to remedy such identified failure to perform, or (b) the willful engaging by the Participant in conduct which is demonstrably and materially injurious to the Employer, monetarily
or otherwise. For purposes of this definition, no act or failure to act, shall be deemed “willful” unless done, or omitted to be done, not in good faith and without reasonable belief that such action or omission was in the best interest of
the Employer. 
 Notwithstanding the foregoing, a Participant shall not be considered to have been terminated for cause unless there is delivered to the
Participant a copy of a resolution duly adopted by the affirmative vote of not less than three-quarters (3/4) of the entire membership of the Board at a meeting of the Board called and held for such purpose (after reasonable notice to the
Participant and an opportunity for the Participant, with legal counsel, to be heard before the Board), finding that in the good faith opinion of the Board, the Participant was engaged in the type of conduct set forth above in this definition, which
specifies particular details and examples of such conduct. 
 “Years of Service” means the total number of years of
“credited service” (as defined in the Retirement Plan) credited to a Participant under the Retirement Plan. In no event shall more than thirty-five (35) years be credited to any Participant, regardless of his or her actual period of
service with the Employer or the number of years of credited service accumulated by the Participant under the Retirement Plan. At the discretion of the Administrator, Participants may be granted additional Years of Service that relate to employment
with another employer for purposes of determining Retirement Benefits under this Plan, upon such terms and conditions as the Administrator may require (which conditions may include, but not be limited to, completion of a period of future service
with the Employer and reducing the Participant’s Retirement Benefit hereunder by the pension benefits provided by such other employer). 

Section 2.2 Usage. Except where otherwise indicated by the context, any masculine terminology used herein shall also
include the feminine and vice versa, and the definition of any term herein in the singular shall also include the plural and vice versa. 

  
 5 

 ARTICLE III 

ELIGIBILITY AND PARTICIPATION 

Section 3.1 Eligibility. An employee of an Employer shall be eligible to participate in the Plan if he or she is
(i) an elected corporate officer of the Employer and agrees to enter into a non-compete, non-solicitation confidentiality agreement or (ii) a senior manager of the Employer who has been selected for participation in this Plan and agrees to
enter into a non-compete, non-solicitation confidentiality agreement and who is participating in the Retirement Plan; provided, however, that any such employee shall be eligible to participate only to the extent, and for the period, that he or she
is a member of a select group of management or highly compensated employees, as such group is described under Sections 201(2), 301(a)(3), and 401(a)(1) of ERISA. The Board shall make all determinations of eligibility in its sole and absolute
discretion. 
 Section 3.2 Participation. An employee who is eligible to participate in the Plan pursuant to
Section 3.1 as an elected corporate officer of the Employer and who is participating in the Retirement Plan shall automatically become a Participant upon election to such office and the execution of a non-compete, non-solicitation
confidentiality agreement. Each other employee who is eligible to participate in the Plan pursuant to Section 3.1 shall become a Participant at such time and for the period as he or she is designated as eligible by the Board or, if no such
period is specified, until his or her participation ceases in accordance with the terms of the Plan. 
 Section 3.3 Plan
Frozen. Notwithstanding the foregoing, no employee shall become eligible to participate in this Plan after December 31, 2006, and the Retirement Benefit of any Participant in the Plan as of December 31, 2006, was frozen on such
date and will not thereafter increase. 

  
 6 

 ARTICLE IV 

RETIREMENT BENEFITS 

Section 4.1 Normal Retirement Benefit.  

(a) Eligibility and Commencement. Subject to Section 4.6(b), a Participant who retires from employment with the Employer on
or after his or her Normal Retirement Date shall receive a Retirement Benefit, determined in accordance with Section 4.1(b), which shall commence to be paid after the Participant’s retirement from the Employer becomes effective. The time
and form of payment of the Retirement Benefit shall be determined in accordance with Section 5.1. 
 (b) Amount. The
Retirement Benefit for a Participant who retires on or after his or her Normal Retirement Date shall be an annual amount, payable in the form specified under Section 5.1 that is equal to the following: 

 

	 	(1)	The product of the following amounts: 

  

	 	(A)	two percent (2%) of such Participant’s Final Average Pay multiplied by 

  

	 	(B)	his or her Years of Service (not in excess of thirty-five (35) years); 

  

	 	(2)	Reduced by the following amounts: 

  

	 	(A)	the Qualified Plan Benefit; 

  

	 	(B)	the annuity annual equivalent benefit, expressed in the form of the annuity payable to a Participant under Section 5.1 hereof, payable under any other nonqualified retirement plan maintained by the Employer or
Koppers Company, determined using the mortality table specified in the Retirement Plan, an interest rate equal to the interest rate used under FAS 87 for the Retirement Plan for the previous year, and a commence age that is the same age at which the
Retirement Benefit is to commence hereunder, in accordance with procedures established by the Administrator; 

  

	 	(C)	 the annuity annual equivalent benefit, expressed in the form of the annuity payable to a Participant under Section 5.1 hereof, of the value of
Company stock held in the Participant’s account in the Employee Savings Plan of Koppers Industries, Inc. and Subsidiaries, and any successor plan, that is attributable to Employer contributions contributed to such plan since 1995, determined
using the mortality table specified in the Retirement Plan, an interest rate equal to the interest rate used under FAS 87 year end disclosures for the Retirement Plan for the previous year

  
 7 

	 	
and a commencement age that is the same age at which the Retirement Benefit is to commence hereunder, in accordance with procedures established by the Administrator. For this purpose, the account
balance will be projected to the Participant’s actual retirement date (or Normal Retirement Date, in the case of a deferred vested Retirement Benefit payable under Section 4.3) at an assumed rate of appreciation of nine percent
(9%) per year; and 

  

	 	(D)	Fifty percent (50%) of the Social Security Benefit; provided, however, that this reduction shall not apply until a Participant reaches his or her Social Security Normal Retirement Age. 

Section 4.2 Early Retirement Benefit.  

(a) Eligibility and Commencement. Subject to Section 4.6(b), a Participant who retires on or after his or her Early
Retirement Date, but before his or her Normal Retirement Date, shall receive a Retirement Benefit, determined in accordance with Section 4.2(b), which shall commence to be paid after the Participant’s retirement from the Employer becomes
effective. The time and form of payment of the Retirement Benefit shall be determined in accordance with Section 5.1. 
 (b)
Amount. The Retirement Benefit payable to a Participant who retires on or after his or her Early Retirement Date, but before his or her Normal Retirement Date, shall be an amount determined in accordance with the following, and subject
to reduction for payment before the Participant’s Normal Retirement Date, as provided below: 
  

	 	(1)	Age 60 / 10 Years. A Participant who retires at sixty (60) or more years of age, but before his or her Normal Retirement Date, and who has ten (10) or more Years of Service, shall receive a
Retirement Benefit, determined in accordance with Section 4.1(b), which shall commence to be paid immediately, without any reduction for payment beginning before his or her or her Normal Retirement Age. 

 

	 	(2)	Age 55 / 10 Years of Service. A Participant who retires at fifty-five (55) or more years of age but less than sixty (60) years of age, and who has ten (10) or more Years of Service, shall
receive a Retirement Benefit, determined in accordance with Section 4.1(b), which shall commence to be paid immediately; provided, however, that the Retirement Benefit shall be reduced by three percent (3.0%) per year for
each year by which payment commences before the Participant reaches age 60. 

  

	 	(3)	Involuntary Termination and 30 Years of Service. A Participant whose employment is Involuntarily Terminated and who has thirty (30) or more Years of Service, shall receive a Retirement Benefit,
determined in accordance with Section 4.1(b), which shall commence to be paid immediately; provided, however, that the Retirement Benefit shall be reduced by three percent (3.0%) per year for each year by which payment
commences before the Participant reaches age 60. 

  
 8 

 Section 4.3 Termination of Employment. Except as provided in
Section 4.2(b)(3) if a Participant incurs a Separation from Service with the Employer for reasons other than Termination for Cause after satisfying the vesting requirement under Section 4.6(a), but before the attainment of his or her Early
Retirement Date or Normal Retirement Date, he shall receive a Retirement Benefit, determined under Section 4.1(b) as of his or her Normal Retirement Date, but such benefit shall be calculated by using his or her Final Average Pay and Years of
Service as of the effective date of his or her Separation from Service. Notwithstanding satisfaction of the vesting requirements in Section 4.6(a), no Retirement Benefit shall be payable hereunder if a Participant incurs an event causing
forfeiture of such benefits under Section 4.6(b). A Participant shall receive payment of his or her Retirement Benefit in a single lump sum within 60 days after his or her Separation from Service if the present value of the Participant’s
Retirement Benefit does not exceed $5,000, determined in accordance with the assumptions and procedures established by the Administrator. 

Section 4.4 Disability. If a Participant becomes Disabled while in the employment of the Employer after satisfying the
vesting requirement under Section 4.6(a), but before the attainment of his or her Early Retirement Date or Normal Retirement Date, he or his or her beneficiary or beneficiaries shall receive a Retirement Benefit upon attaining his or her Normal
Retirement Date, determined under Section 4.1(b), but such Retirement Benefit shall be calculated using the Participant’s Final Average Pay and Years of Service as of the effective date of his or her Disability and the actual Social
Security Benefit that he or she eventually receives. The Board may in its discretion provide that the amount of such Retirement Benefit shall be enhanced by taking into account additional Years of Service which are reasonably expected to have
occurred absent the Participant’s Disability. Notwithstanding satisfaction of the vesting requirements in Section 4.6(a), no Retirement Benefit shall be payable hereunder if a Participant incurs an event causing forfeiture of such benefits
under Section 4.6(b). 
 Section 4.5 Death. If a Participant with five (5) or more Years of Service dies while in
the employment of the Employer, his or her beneficiary or beneficiaries shall be entitled to, and shall receive, payment of the Participant’s Retirement Benefit, payable unreduced as soon as practicable following the Participant’s death.

 Section 4.6 Vesting and Forfeiture of Retirement Benefit. 

(a) Vested Benefits. Except as provided in subsection (b) below, a Participant who is in the active employ of an Employer
shall have a vested right to his or her Retirement Benefit upon the occurrence of any of the following: 
  

	 	(1)	his or her completion of five (5) Years of Service, which includes any Years of Service prior to the effective date of the Plan described in Section 1.1 hereof; 

 

	 	(2)	the attainment of his or her Normal Retirement Age; or 

  

	 	(3)	the occurrence of a Change in Control at any time. 

  
 9 

 (b) Forfeiture. Notwithstanding subsection (a), upon the occurrence of any of the
following, a Participant’s Retirement Benefit hereunder shall be forfeited, and no such benefit shall be payable hereunder: 
  

	 	(1)	his or her Termination for Cause; 

  

	 	(2)	his or her breach of any non-compete, non-solicitation confidentiality agreement with the Company; (The terms of the non-compete, non-solicitation, confidentiality agreement will become null and void if the
Participant’s employment is Involuntarily Terminated by reason of layoff.) 

  

	 	(3)	without the consent of the Chief Executive Officer of the Company, his or her becoming, directly or indirectly, involved, whether alone or as a partner, joint venturer, franchisee, franchiser, officer, director,
employee, independent contractor, employer, agent, shareholder or other owner or operative in any other business that competes with the Employer; 

  

	 	(4)	his or her directly or indirectly, soliciting or inducing or attempting to solicit or induce, any employee of Employer to leave Employer for any reason whatsoever or hire any employee of Employer; 

 

	 	(5)	without the consent of the Chief Executive Officer of the Company, his or her directly or indirectly soliciting the trade of or trade with, or otherwise doing business with any client of Employer so as to offer or sell
any product or services that would be competitive with any products or services sold by Employer during the term of Employee’s employment or any products or services which Employee knows are being developed by Employer during the term of his or
her employment; or 

  

	 	(6)	his or her directly or indirectly taking any action which might divert from Employer any opportunity that is within the scope of any present or contemplated future business of Employer during the term of
Participant’s employment or any opportunities that Participant knows are being developed by Employer during the term of his or her employment. 

The payment of any Retirement Benefit that has commenced shall be discontinued immediately, and any future payments shall be forfeited, upon the occurrence of
any of the events described in subsections (2) through (6) above. 

  
 10 

 ARTICLE V 

PAYMENT OF RETIREMENT BENEFITS 

Section 5.1 Distribution of Retirement Benefits. Except as otherwise elected in accordance with the provisions of this
Section 5.1, a Participant’s Retirement Benefit shall be payable as follows: 
 (a) Retirement 

 

	 	(1)	Normal Retirement. A Participant’s Retirement Benefit shall commence in the Normal Form as of the first day of the month following the Participant’s Separation from Service on or after the
Participant’s Normal Retirement Date or, if the Participant is a Specified Employee on the date of his or her Separation from Service, as of the first day of the sixth month following the month in which his Separation from Service occurs,
unless the Participant elects to receive his or her Retirement Benefit in an optional form of payment in accordance with the provisions set forth in Section 5.1(c) and/or commencing on a different date in accordance with the timing rule set
forth in Section 5.1(d). 

  

	 	(2)	Early Retirement. A Participant’s Retirement Benefit shall commence in the Normal Form as of the first day of the month following the Participant’s Separation from Service on or after the
Participant’s Early Retirement Date, but prior to the Participant’s Normal Retirement Date or, if the Participant is a Specified Employee on the date of his or her Separation from Service, as of the first day of the sixth month following
the month in which his or her Separation from Service occurs, unless the Participant elects to receive his or her Retirement Benefit in an optional form of payment in accordance with the provisions set forth in Section 5.1(c) and/or commencing
on a different date in accordance with the timing rule set forth in Section 5.1(d). 

 (b) Termination of
Employment. In the case of a Participant who incurs a Separation from Service for reasons other than Termination for Cause prior to his or her Early Retirement Date or Normal Retirement Date, his Retirement Benefit shall commence in the
Normal Form as of the first day of the month following the Participant’s Normal Retirement Date, unless the Participant elects to receive his Retirement Benefit in an optional form of payment in accordance with the provisions set forth in
Section 5.1(c) and/or commencing on a different date in accordance with the timing rule set forth in Section 5.1(d); provided that a Participant shall receive payment currently in a single lump sum if the present value of such payment does
not exceed $5,000 (determined in accordance with assumptions and procedures established by the Administrator). Notwithstanding the foregoing, if the Participant is a Specified Employee on the date of his or her Separation from Service, payment shall
commence as of the first day of the sixth month following the month in which his or her Separation from Service occurs, if later than the date determined above. 

  
 11 

 (c) Change in Form of Payment. A Participant may elect, at any time during the
180-day period prior to the date on which benefits would commence under Section 5.1(a) or Section 5.1(b), as applicable (or prior to any later commencement date elected under Section 5.1(d)) to receive one of the following forms of
payment in lieu of the Normal Form: 
  

	 	(1)	A Retirement Benefit payable for the Participant’s life, with no Retirement Benefit payable after his death. 

  

	 	(2)	A reduced Retirement Benefit payable during the Participant’s life with the provision that after his death 50%, 75% or 100% of the amount payable during the Participant’s life shall be paid during the life of
and to the person nominated by him as his beneficiary by written designation, filed with the Committee, when he elected this option, if such person survives him. 

  

	 	(3)	A reduced Retirement Benefit payable for the Participant’s life and a period certain of 5 years as he shall have selected in writing at the time he elects this option; provided, that such period certain shall not
extend beyond the joint and last survivor expectancy of the Participant and his beneficiary. 

 In each case, the optional
form so elected shall be the Actuarial Equivalent of the Normal Form. In addition, if the Participant is married on the date of benefit commencement, his choice of any form of payment other than the Normal Form or an optional form under
(2) above with his spouse as beneficiary shall be valid only if he obtains his spouse’s written consent in a manner comparable to the analogous consent requirements applicable under the Retirement Plan. 

(d) Change in Timing. A Participant may elect to defer the commencement date of his or her Retirement Benefit to a date later
than the date specified under Section 5.1(a) or Section 5.1(b), as applicable, provided that such deferral of commencement shall only be effective if (i) the election is made not less than 12 months before the date the
Participant’s Retirement Benefit would otherwise commence, and (ii) payment will commence under the new election no earlier than the 5th anniversary of the date any payment would otherwise have been made under Section 5.1(a) or
Section 5.1(b), as applicable. Only one such deferral election shall be permitted under this Plan for each Participant. 

Section 5.2 Designation of Beneficiary. A Participant may, by written instruction delivered to the Administrator during the
Participant’s lifetime, designate one or more primary and contingent beneficiaries to receive the Retirement Benefit which may be payable hereunder following the Participant’s death, and may designate the proportions in which such
beneficiaries are to receive such payments. A Participant may change such designations from time to time, and the last written designation filed with the Administrator prior to the Participant’s death shall control. If a Participant fails to
specifically designate a beneficiary, or if no designated beneficiary survives the Participant, payment shall be made by the Administrator to the Participant’s surviving spouse, or if none, to the Participant’s children, or if none, to the
Participant’s estate. 

  
 12 

 ARTICLE VI 

CHANGE IN CONTROL 

Section 6.1 “Change in Control” Defined. For purposes of this Section, a “Change in Control” shall be
deemed to have occurred upon the first to occur of the following events: 
 (a) any person, or more than one person acting as a group,
acquires ownership of stock of the Company that, together with the stock held by such person or group, represents more than thirty-five (35%) percent of the total fair market value or total voting power of the stock of the Company (“Change
in Ownership”); or 
 (b) during any twelve-month period, a majority of the Company’s Board is replaced by new directors whose
appointment or election is not endorsed by a majority of the Company’s Board prior to the date of the new directors’ appointment or election (“Change in Effective Control”); or 

(c) during any twelve-month period, any one person, or more than one person acting as a group, acquires assets from the Company having a total
fair market value equal to or more than one-third (1/3) of the total fair market value of all of the assets of the Company immediately prior to such acquisition(s) (“Change in Ownership of Substantial Assets”); notwithstanding the
preceding, a Change in Ownership of Substantial Assets does not occur when assets are transferred to (a) a shareholder in exchange for stock; (b) an entity that is at least fifty (50%) percent owned, directly or indirectly, by the
Company; (c) a person, or more than one person acting as a group, that owns at least fifty (50%) percent of the total value or voting power of the stock of the Company; or, (d) an entity that is at least fifty (50%) percent owned
by a person, or more than one person acting as a group, that owns at least fifty (50%) percent of the total value or voting power of the stock of the Company; or, 

(d) the Company’s termination of its business and liquidation of its assets; or, 

(e) the reorganization, merger or consolidation of the Company into or with another person or entity, by which reorganization, merger or
consolidation the shareholders of the Company receive less than fifty (50%) percent of the outstanding voting shares of the new or continuing corporation. 

For purposes of the preceding Change in Ownership, Change in Effective Control and Change in Ownership of Substantial Assets, persons are considered to be
acting as a group when such persons are owners of an entity that enters into a merger, consolidation, purchase or acquisition of stock, or a similar business transaction with the Company. Persons are not considered to be acting as a group merely
because such persons happen to purchase or own stock of the Company at the same time or as a result of the same public offering. 

Section 6.2 Vesting Upon Change in Control. Each Participant shall become fully vested in his or her Retirement Benefit in
the event that there is a Change in Control. 

  
 13 

 ARTICLE VII 

ADMINISTRATION 

Section 7.1 General. Except as otherwise specifically provided in the Plan, the Administrator shall be responsible for
administration of the Plan. The Administrator shall be the “named fiduciary” within the meaning of Section 402(c)(2) of ERISA. 

Section 7.2 Administrative Rules. The Administrator may adopt such rules of procedure as it deems desirable for the conduct
of its affairs, except to the extent that such rules conflict with the provisions of the Plan. 
 Section 7.3 Duties. The
Administrator shall have the following rights, powers and duties: 
 (a) The decision of the Administrator in matters within its
jurisdiction shall be final, binding and conclusive upon the Employers and upon any person affected by such decision subject to the claims procedure hereinafter set forth. 

(b) The Administrator shall have the duty and authority to interpret and construe the provisions of the Plan, to determine eligibility for
Retirement Benefits and the appropriate amount of any Retirement Benefits, to decide any question which may arise regarding the rights of employees and to exercise such powers as the Administrator may deem necessary for the administration of the
Plan, and to exercise any other rights, powers or privileges granted to the Administrator by the terms of the Plan. 
 (c) The Administrator
shall maintain full and complete records of its decisions. Its records shall contain all relevant data pertaining to the Participant and his or her rights and duties under the Plan. The Administrator shall have the duty to maintain Account records
of all Participants. 
 (d) The Administrator shall cause the principal provisions of the Plan to be communicated to the Participants, and a
copy of the Plan and other documents shall be available at the principal office of the Employers for inspection by the Participants at reasonable times determined by the Administrator. 

(e) The Administrator shall periodically report to the Board with respect to the status of the Plan. 

Section 7.4 Fees. No fee or compensation shall be paid to any person for services as the Administrator. 

  
 14 

 ARTICLE VIII 

CLAIMS PROCEDURE 

Section 8.1 General. Any claim for Retirement Benefits under the Plan shall be filed by the Participant or beneficiary
(“claimant”) in the manner prescribed by the Administrator. 
 Section 8.2 Denials. If a claim for Retirement
Benefits under the Plan is wholly or partially denied, notice of the decision shall be furnished to the claimant by the Administrator within a reasonable period of time, but not more than 90 days after receipt of the claim by the Administrator,
unless special circumstances require further time for processing and the claimant is advised of the extension before the expiration of the initial 90-day period. In no event shall notice of the decision be given more than 180 days after the receipt
of the claim. 
 Section 8.3 Notice. Any claimant who is denied a claim for Retirement Benefits shall be furnished
written notice setting forth: 
 (a) the specific reason or reasons for the denial; 

(b) specific reference to the pertinent provision of the Plan upon which the denial is based; 

(c) a description of any additional material or information necessary of the claimant to perfect the claim; and 

(d) an explanation of the claim review procedure under the Plan. 

Section 8.4 Appeals Procedure. In order that a claimant may appeal a denial of a claim, the claimant or the claimant’s
duly authorized representative may: 
 (a) request a review by written application to the Administrator, or its designate, no later than 60
days after receipt by the claimant of written notification of denial of a claim; 
 (b) review pertinent documents; and 

(c) submit issues and comments in writing. 

Section 8.5 Review. A decision on review of a denied claim shall be made not later than sixty (60) days after receipt
of a request for review, unless special circumstances require an extension of time for processing and the claimant is notified of the extension prior to the expiration of the initial 60-day period, in which case a decision shall be rendered within a
reasonable period of time, but not later than one hundred and twenty (120) days after receipt of the request for a review. The decision on review shall be in writing and shall include the specific reason(s) for the decision and the specific
reference(s) to the pertinent provisions of the Plan on which the decision is based. 
 Section 8.6 Arbitration of
Disputes. Notwithstanding any provision to the contrary, any dispute arising under this Plan, including without limitation, a dispute involving a claim for 

  
 15 

 
benefits, a dispute arising as a result of a Termination for Cause (as defined in Section 2.1), or a dispute arising as a result of a forfeiture of Plan benefits pursuant to
Section 4.6(b), shall be resolved by binding arbitration. 
 All arbitration shall be determined in accordance with the rules of the American
Arbitration Association then in effect, by a single arbitrator if the parties shall agree upon one, or by three arbitrators, one appointed by each party and a third arbitrator appointed by the two arbitrators selected by the parties. All arbitrators
shall be selected from a panel proposed by the American Arbitration Association. If any party fails to appoint an arbitrator within thirty (30) days after it is notified to do so, the arbitration shall be accomplished by a single arbitrator.
Each party agrees to comply with any award made in any such proceeding and to the entry of a judgment in any jurisdiction upon any award rendered in such proceeding. The decision of the arbitrators shall be tendered within sixty (60) days of
final submission of the parties in writing or any hearing before the arbitrators and shall include their individual votes. If a Participant is entitled to an award pursuant to the determination reached in the arbitration proceeding which is equal to
or greater to the amount, if any, offered by Employer prior to or during arbitration, the Participant shall be entitled to payment by the Employer of all attorneys’ fees, costs and other out-of-pocket expenses incurred in connection with the
arbitration. 

  
 16 

 ARTICLE IX 

MISCELLANEOUS PROVISIONS 

Section 9.1 Amendment and Termination. The Company retains the sole and unilateral right to terminate, amend, modify, or
supplement this Plan, in whole or in part, at any time (including retroactive amendments); provided that no such change shall reduce a Participant’s Retirement Benefit as of the date of such change. In the event of the termination of the Plan
or any portion thereof, payment of affected Participants’ Retirement Benefits shall be made under and in accordance with the terms of the Plan and any applicable elections, except that the Company may determine, in its sole discretion, to
accelerate payments to all such affected Participants if and to the extent that such acceleration is permitted under Section 409A of the Code. 

Section 9.2 No Assignment. The Participant shall not have the power to pledge, transfer, assign, anticipate, mortgage or
otherwise encumber or dispose of in advance any interest in amounts payable hereunder of any of the payments provided for herein, nor shall any interest in amounts payable hereunder or in any payments be subject to seizure for payments of any debts,
judgments, alimony or separate maintenance, or be reached or transferred by operation of law in the event of bankruptcy, insolvency or otherwise. 

Section 9.3 Successors and Assigns. The provisions of the Plan are binding upon and inure to the Retirement Benefit of each
Employer, its successors and assigns, and the Participant, his or her beneficiaries, heirs and legal representatives. 
 Section 9.4
Governing Law. The Plan shall be subject to and construed in accordance with the laws of the Commonwealth of Pennsylvania to the extent not preempted by the provisions of ERISA. 

Section 9.5 No Guarantee of Employment. Nothing contained in the Plan shall be construed as a contract of employment or
deemed to give any Participant the right to be retained in the employ of an Employer or any equity or other interest in the assets, business or affairs of an Employer. No Participant hereunder shall have a security interest in assets of an Employer
used to make contributions or pay Retirement Benefits. 
 Section 9.6 Severability. If any provision of the Plan shall be
held illegal or invalid for any reason, such illegality or invalidity shall not affect the remaining provisions of the Plan, but the Plan shall be construed and enforced as if such illegal or invalid provision had never been included herein. 

Section 9.7 Notification of Addresses. Each Participant and each beneficiary shall file with the Administrator, from time
to time, in writing, the post office address of the Participant, the post office address of each beneficiary, and each change of post office address. Any communication, statement or notice addressed to the last post office address filed with the
Administrator (or if no such address was filed with the Administrator, then to the last post office address of the Participant or beneficiary as shown on the Employer’s records) shall be binding on the Participant and each beneficiary for all
purposes of the Plan and neither the Administrator nor the Employer shall be obliged to search for or ascertain the whereabouts of any Participant or beneficiary. 

  
 17 

 Section 9.8 Bonding. The Administrator and all agents and advisors employed by
it shall not be required to be bonded, except as otherwise required by ERISA. 
 Section 9.9 Taxes. The Company shall
have the right to withhold from any cash or other amounts due or to become due from the Company to a Participant (including by reducing the amount of any Retirement Benefit payable in the future) the amount of any federal, state and local taxes
required to be withheld or otherwise deducted and paid by the Company with respect to the vesting or payment of any Retirement Benefit hereunder. 

Section 9.10 Compliance with Section 409A. The Plan is intended to comply with the applicable requirements of
Section 409A of the Code, and will be administered in accordance with Section 409A of the Code to the extent that Section 409A of the Code applies to the Plan. Notwithstanding any provision in the Plan to the contrary, distributions
from the Plan may only be made in a manner, and upon an event, permitted by Section 409A of the Code. If any payment or benefit cannot be provided or made at the time specified herein without incurring penalties under Section 409A of the
Code, then such benefit or payment will be provided in full at the earliest time thereafter when such penalties will not be imposed. To the extent that any provision of the Plan would cause a conflict with the applicable requirements of
Section 409A of the Code or would cause the administration of the Plan to fail to satisfy the applicable requirements of Section 409A of the Code, such provision shall be deemed null and void to the extent permitted by applicable law. 

  
 18 

 ARTICLE X 

FUNDING 

Section 10.1 Employer Liability. The entire cost of this Plan shall be paid from the general assets of the Employer. No
liability for the payment of Retirement Benefits under the Plan shall be imposed upon any officer, trustee, employee, or agent of an Employer. 

Section 10.2 Unfunded Plan. Notwithstanding the remaining sections in this Article, the Plan, at all times, shall be
entirely unfunded and shall constitute merely the unsecured promise of the Employer to make the payments as provided for herein. No Participant nor any beneficiary nor any other person shall have, by reason of this Plan, any rights, title or
interest of any kind in or to any property of the Employer, all of which shall be subject to the claims of general creditors of the Employer, nor any beneficial interest in any trust which may be established by the Employer in connection with this
Plan nor any guarantee that assets of the Employer will be sufficient to pay Retirement Benefits under the Plan. If the Employer transfers any property to a trust in connection with this Plan such trust shall not be held for the exclusive benefit of
Participants and any assets held in such trust shall be subject to the claims of the Employer’s general creditors in the event of the Employer’s insolvency. 

Section 10.3 Trust. A trust may be established by the execution of a Trust Agreement with one or more trustees, to be known
as the Koppers Inc. Supplemental Executive Retirement Trust (the “Trust”). If a Trust is established, the following provisions shall be applicable: 

(a) The Trust shall be maintained as a “grantor trust” under Section 677 of the Code, with the assets of the Trust being held,
invested and disposed of by the trustee, in accordance with the terms of the Trust, for the exclusive purpose of providing Retirement Benefits for Participants. Notwithstanding any provision of the Plan or the Trust to the contrary, all assets held
in the Trust shall at all times be subject to the claims of the Employer’s general creditors in the event of insolvency or bankruptcy. 

(b) The Employer, in its sole discretion, and from time to time, may make contributions to the Trust. All Retirement Benefits under the Plan
and expenses chargeable to the Plan, to the extent not paid directly by the Employer, shall be paid from the Trust. 
 (c) The powers,
duties and responsibilities of the trustee shall be as set forth in the Trust Agreement and nothing contained in the Plan, either expressly or by implication, shall impose any additional powers, duties or responsibilities upon the trustee. 

(d) The Employer shall have no beneficial interest in the Trust and no part of the Trust shall ever revert or be repaid to the Employer,
directly or indirectly, except as otherwise provided in subsection (a) above or in the Trust Agreement. 

  
 19 

 EXECUTION 

The undersigned, pursuant to the approval of the Board, does herewith execute this Koppers Inc. Supplemental Executive Retirement Plan II, effective as of the
effective date of the amended and restated Plan specified in Section 1.1 hereof. 
  

			
	Koppers Inc.
		
	By:	 	  

		
	Title:	 	  

  
 20

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