Document:

EX-10.99

 Exhibit 10.99 

KOPPERS HOLDINGS INC. 

RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- PERFORMANCE VESTING 

RECITALS 
 A. The Board has adopted the Plan for
the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any
Parent or Subsidiary). 
 B. Participant is to render valuable services to the Corporation (or a Parent or Subsidiary), and this Agreement is
executed pursuant to, and is intended to carry out the purposes of, the Plan in connection with the Corporation’s issuance of shares of Common Stock to Participant under the Plan. 

C. All capitalized terms in this Agreement shall have the meaning assigned to them in the attached Appendix A. 

NOW, THEREFORE, it is hereby agreed as follows: 

1. Grant of Restricted Stock Units. The Corporation hereby awards to Participant, as of the Award Date, Restricted Stock Units under the
Plan. Except as otherwise provided in this Agreement, the Restricted Stock Units shall vest on March             , 2018, provided (i) the Participant continues in Service until March
            , 2018 and (ii) the pre-established performance objective tied to the Corporation’s Cumulative Koppers Value Added (as defined in Schedule I attached hereto) measured
over a specified period is attained. Each Restricted Stock Unit which so vests shall entitle Participant to receive one share of Common Stock on the specified issue date. The number of shares of Common Stock subject to the awarded Restricted Stock
Units, the applicable performance target for the vesting of those shares, the alternative and special vesting provisions which may become applicable to such shares, the date on which the vested shares shall become issuable to Participant and the
remaining terms and conditions governing the award (the “Award”) shall be as set forth in this Agreement. 
 AWARD SUMMARY 

 

			
	Award Date:		March             , 2015
		
	Target Number of Shares Subject to Award:		                    shares of Common Stock (the “Shares”); provided, however, that the actual number of
Restricted Stock Units shall be determined in accordance with the provisions of Schedule I attached hereto.

			
		
	Vesting Schedule:		The Shares shall vest on March             , 2018, provided (i) the Participant continues in Service until March
            , 2018 and (ii) the Performance Objective set forth in the attached Schedule I is attained over the Measurement Period. However, the Shares may also vest in accordance with the
special vesting provisions of Paragraph 5 of this Agreement.
		
	Issuance Schedule:		The Shares in which Participant vests in accordance with the foregoing Vesting Schedule shall become issuable on March             , 2018 (or upon the date of an earlier
Change in Control, or six months after the date of an earlier involuntary termination other than for Misconduct following a Change in Control, if so provided herein) (the “Issue Date”). The actual issuance of the Shares shall be subject to
the Corporation’s collection of all applicable Withholding Taxes and shall be effected on the applicable Issue Date or as soon as administratively practicable thereafter, but in no event later than the close of the calendar year in which such
Issue Date occurs or (if later) the fifteenth (15th) day of the third (3rd) calendar month following such Issue Date. The procedures pursuant to which the applicable Withholding Taxes are to be collected are set forth in Paragraph 7 of this
Agreement.

 2. Limited Transferability. Prior to the actual issuance of the Shares which vest hereunder, Participant
may not transfer any interest in the Award or the underlying Shares; provided, however, any Shares which vest hereunder but which otherwise remain unissued at the time of Participant’s death may be transferred pursuant to the
provisions of Participant’s will or the laws of inheritance or to Participant’s designated beneficiary or beneficiaries of this Award. Participant may make a beneficiary designation for this Award at any time by filing the appropriate form
with the Plan Administrator or its designee. 
 3. Cessation of Service. Except as otherwise provided in Paragraph 5 below, should
Participant cease Service for any reason prior to vesting in one or more Shares subject to this Award, then the Award will be immediately cancelled with respect to those unvested Shares. Participant shall thereupon cease to have any right or
entitlement to receive any Shares under those cancelled units. 
 4. Stockholder Rights and Dividend Equivalents 

(a) The holder of this Award shall not have any stockholder rights, including voting or dividend rights, with respect to the Shares subject to
the Award until Participant becomes the record holder of those Shares following their actual issuance upon the Corporation’s collection of the applicable Withholding Taxes. 

(b) Notwithstanding the foregoing, should any stock dividend, whether regular or extraordinary, be declared and paid on the outstanding Common
Stock while one or more Shares remain subject to this Award (i.e., those Shares are not otherwise issued and outstanding for purposes of entitlement to the dividend or distribution), then Participant shall automatically be credited with an
additional number of Restricted Stock Units equal to the number of shares of Common Stock which would have been paid on the Shares (plus the number of additional shares previously credited to Participant pursuant to the dividend equivalent right
provisions of this Paragraph 4) at the time subject to this Award had those Shares been actually issued and outstanding and entitled to that dividend. The additional 

  
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Restricted Stock Units so credited shall vest at the same time as the Shares to which they relate and shall be distributed to Participant concurrently with the issuance of those Shares on the
applicable Issue Date. However, each such distribution shall be subject to the Corporation’s collection of the Withholding Taxes applicable to that distribution. 

(c) Notwithstanding the foregoing, should any cash dividend, whether regular or extraordinary, be declared and paid on the outstanding Common
Stock while one or more Shares remain subject to this Award (i.e., those Shares are not otherwise issued and outstanding for purposes of entitlement to the dividend or distribution), then a special book account shall be established for Participant
and credited with a dollar amount equal to the amount of that dividend paid per share multiplied by the number of Restricted Stock Units at the time subject to this Award (plus the number of additional shares previously credited to Participant
pursuant to the dividend equivalent right provisions of this Paragraph 4) as of the record date for the dividend. As of the first business day in January each year, the cash dividend amounts credited to the special book account during the
immediately preceding calendar year shall be converted into a book entry of an additional number of Restricted Stock Units determined by dividing (i) those cash dividend equivalent amounts by (ii) the average of the Fair Market Value per
share of Common Stock on each of the dates in the immediately preceding calendar year on which those dividends on the outstanding Common Stock were paid. The additional Restricted Stock Units so credited shall vest at the same time as the Shares to
which they relate and shall be distributed to Participant concurrently with the issuance of those Shares on the applicable Issue Date. However, each such distribution shall be subject to the Corporation’s collection of the Withholding Taxes
applicable to that distribution. 
 5. Special Vesting/Change in Control. 

(a) Should Participant’s Service terminate by reason of his or her Retirement, death or Permanent Disability prior to March
            , 2018, then on March             , 2018, Participant shall vest in a number of Shares equal to the number of Shares
(if any) in which Participant would have been vested at March             , 2018 had Participant continued in the Corporation’s Service through March
            , 2018 multiplied by a fraction, the numerator of which is the number of full months of Service Participant completed between the Award Date and the termination of
Participant’s Service, and the denominator of which is thirty-six (36). In the event of the termination of Participant’s Service due to Participant’s Retirement, such vesting shall be conditioned upon Participant’s compliance
with the conditions of Section 9 through March             , 2018. 
 (b)
Any Restricted Stock Units subject to this Award at the time of a Change in Control may be assumed by the successor entity or otherwise continued in full force and effect or may be replaced with a cash retention program of the successor entity which
preserves the Fair Market Value of the unvested shares of Common Stock subject to the Award at the time of the Change in Control and provides for subsequent payout of that value in accordance with the same (or more favorable) vesting schedule in
effect for the Award at the time of such Change in Control. In the event of such assumption or continuation of the Award or such replacement of the Award with a cash retention program, no accelerated vesting of the Restricted Stock Units shall occur
at the time of the Change in Control. However, in the event that the Change in Control occurs prior to the end of the Measurement Period, the vesting provisions in effect for the Award following the Change in Control shall no longer be tied to the
attainment of the full Performance Objective set forth in Schedule I and shall instead be converted into the following vesting schedule: The Award (whether in its assumed or continued 

  
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form or as converted into a cash retention program) shall vest with respect to the number of Shares (or the amount of cash) determined under Section 5(c) below upon Participant’s
continuation in Service through March             , 2018. Following the completion of such Service vesting period, the securities, cash or other property underlying the vested Award shall
be issued on the applicable Issue Date. The Award may also vest in accordance with the special vesting provisions of Paragraphs 5(a) and (e) of this Agreement. 

(c) In the event the Award is assumed or otherwise continued in effect, the Restricted Stock Units subject to the Award shall be adjusted
immediately after the consummation of the Change in Control so as to apply to the number and class of securities into which the Shares subject to those units immediately prior to the Change in Control would have been converted in consummation of
that Change in Control had those Shares actually been issued and outstanding at that time. However, in the event that the Change in Control occurs within the first eighteen (18) months of the Measurement Period, the Award shall remain
outstanding and eligible for Service vesting under the terms of this Agreement with respect only to the number of Shares (as so adjusted) that would have been earned pursuant to the Performance Objective identified in Schedule I if the
Corporation’s performance at the end of the Measurement Period was at the Target level. In the event that the Change in Control occurs on or after the first day of the nineteenth (19th) month of the Measurement Period and prior to the end
of the Measurement Period, the Award shall remain outstanding and eligible for Service vesting under the terms of this Agreement only with respect to the number of Shares (as so adjusted) that would have been earned pursuant to the Performance
Objective identified in Schedule I (pro-rated through the date of the Change in Control) based on the Corporation’s actual performance through the effective date of the Change in Control. To the extent the actual holders of the outstanding
Common Stock receive cash consideration for their Common Stock in consummation of the Change in Control, the successor corporation (or parent entity) may, in connection with the assumption or continuation of the Restricted Stock Units subject to the
Award at that time, substitute one or more shares of its own common stock with a fair market value equivalent to the cash consideration paid per share of Common Stock in the Change in Control transaction, provided such common stock is readily
tradable on an established U.S. securities exchange or market. In the event the Award is converted into a cash retention program, the amount of cash subject to the Award under such program shall be equal to the value of the number of Shares
determined in accordance with the foregoing provisions of this Section 5(c) as of the effective date of the Change in Control (based on the per-share value of the consideration received by holders of the outstanding Common Stock in connection
with the Change in Control), plus credited interest or earnings through the Issue Date as determined under the terms of such cash retention program. 

(d) If (i) the Change in Control occurs on or after the end of the Measurement Period but prior to March
            , 2018 or (ii) if the Change in Control occurs prior to the end of the Measurement Period but the Restricted Stock Units subject to this Award at the time of the Change in
Control are not assumed or otherwise continued in effect or replaced with a cash retention program in accordance with Paragraph 5(b), then (i) if the Change in Control occurs within the first eighteen (18) months of the Measurement Period,
a number of units equal to the number of Shares that would have been earned pursuant to the Performance Objective identified in Schedule I if the Corporation’s performance at the end of the Measurement Period was at the Target level (less any
Shares in which Participant is at the time vested) will vest immediately prior to the closing of the Change in Control and (ii) if the Change in Control occurs on or after the first day of the nineteenth (19th) month of the Measurement
Period, a number of 

  
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units equal to the number of Shares that have been earned pursuant to the Performance Objective identified in Schedule I (pro-rated through the date of the Change in Control if it occurs prior to
the end of the Measurement Period) based on the Corporation’s actual performance through the earlier of the effective date of the Change in Control or the end of the Measurement Period will vest immediately prior to the closing of the Change in
Control. The Shares that vest under this subparagraph (d) will be issued on the Issue Date triggered by the Change in Control (or otherwise converted into the right to receive the same consideration per share of Common Stock payable to the
other stockholders of the Corporation in consummation of that Change in Control and distributed at the same time as such stockholder payments), subject to the Corporation’s collection of the applicable Withholding Taxes pursuant to the
provisions of Paragraph 7. For purposes of this Section 5(d), the Issue Date shall be the effective date of the Change in Control so long as it qualifies as a “change in the ownership or effective control” of the Corporation within
the meaning of Section 409A(a)(2)(A)(v) of the Code and regulations thereunder. If it does not so qualify, the Issue Date shall be March             , 2018. 

(e) Upon an involuntary termination of Participant’s Service for reasons other than Misconduct within twenty-four (24) months
following a Change in Control transaction which does not otherwise result in the accelerated vesting of the Restricted Stock Units pursuant to the provisions of subparagraph (d) of this Paragraph 5 and prior to March
            , 2018, a number of units equal to the number of Shares that would have been earned pursuant to Section 5(c) shall vest on such date of termination. Any unvested cash
account maintained on Participant’s behalf pursuant to the cash retention program established in accordance with subparagraph (b) of this Paragraph 5 shall also vest at the time of such involuntary termination. The Issue Date for such
vested Shares or cash shall be six months after the date of termination (or, if earlier, March             , 2018), so long as the Change in Control qualifies as a “change in the
ownership or effective control” of the Corporation within the meaning of Section 409A(a)(2)(A)(v) of the Code and regulations thereunder. If it does not so qualify, the Issue Date shall be March
            , 2018. 
 (f) This Agreement shall not in any way affect the right
of the Corporation to adjust, reclassify, reorganize or otherwise change its capital or business structure or to merge, consolidate, dissolve, liquidate or sell or transfer all or any part of its business or assets. 

6. Adjustment in Shares. In the event of any of the following transactions affecting the outstanding shares of Common Stock as a class
without the Corporation’s receipt of consideration: any stock split, stock dividend, spin-off transaction, extraordinary distribution (whether in cash, securities or other property), recapitalization, combination of shares, exchange of shares
or other similar transaction affecting the outstanding Common Stock as a class without the Corporation’s receipt of consideration or in the event of a substantial reduction to the value of the outstanding shares of Common Stock by reason of a
spin-off transaction or extraordinary distribution, then equitable adjustments shall be made to the total number and/or class of securities issuable pursuant to this Award in such manner as the Plan Administrator deems appropriate in order to
reflect such change and thereby prevent the dilution or enlargement of benefits hereunder. In determining such adjustments, the Plan Administrator shall take into account any amounts credited to Participant pursuant to the dividend equivalent right
provisions of Paragraph 4 in connection with such transaction, and the determination of the Plan Administrator shall be final, binding and conclusive. 

  
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 7. Collection of Withholding Taxes. 

(a) Upon the applicable Issue Date, the Corporation shall issue to or on behalf of Participant a certificate (which may be in electronic form)
for the applicable number of underlying shares of Common Stock, subject, however, to the Corporation’s collection of the applicable Withholding Taxes. 

(b) Until such time as the Corporation provides Participant with written or electronic notice to the contrary, the Corporation shall collect
Withholding Taxes required to be withheld with respect to the vesting or issuance of the vested Shares hereunder (including shares attributable to the dividend equivalent rights provided under Paragraph 4) through an automatic share withholding
procedure pursuant to which the Corporation will withhold, at the time of such vesting or issuance, a portion of the Shares with a Fair Market Value (measured as of the vesting or issuance date, as applicable) equal to the amount of those taxes
(including taxes resulting from such withholding) (the “Share Withholding Method”); provided, however, that the amount of any Shares so withheld shall not exceed the amount necessary to satisfy the
Corporation‘s required tax withholding obligations using the minimum statutory withholding rates for federal and state tax purposes that are applicable to supplemental taxable income. Participant shall be notified in writing or electronically
in the event such Share Withholding Method is no longer available. 
 (c) Should any Shares (including shares attributable to the dividend
equivalent rights provided under Paragraph 4) vest or be issued at a time when the Share Withholding Method is not available, then the Withholding Taxes required to be withheld with respect to those Shares shall be collected from Participant through
either of the following alternatives: 
 • Participant’s delivery of his or her separate check payable to the
Corporation in the amount of such taxes, or 
 • the use of the proceeds from a next-day sale of the Shares issued to
Participant, provided and only if (i) such a sale is permissible under the Corporation’s trading policies governing the sale of Common Stock, (ii) Participant makes an irrevocable commitment, on or before the Issue Date for those
Shares, to effect such sale of the Shares and (iii) the transaction is not otherwise deemed to constitute a prohibited loan under Section 402 of the Sarbanes-Oxley Act of 2002. 

(d) Except as otherwise provided in Paragraph 5 and Paragraph 4, the settlement of all Restricted Stock Units which vest under the Award shall
be made solely in shares of Common Stock. In no event, however, shall any fractional shares be issued. Accordingly, the total number of shares of Common Stock to be issued pursuant to the Award shall, to the extent necessary, be rounded down to the
next whole share in order to avoid the issuance of a fractional share. 

  
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 8. Compliance with Laws and Regulations. The issuance of shares of Common Stock pursuant
to the Award shall be subject to compliance by the Corporation and Participant with all applicable requirements of law relating thereto and with all applicable regulations of any stock exchange on which the Common Stock may be listed for trading at
the time of such issuance. 
 9. Additional Conditions. 

(a) The Corporation may cancel this Award, and Participant shall cease to have any further right to the underlying shares at any time
Participant is not in compliance with this Agreement, the Plan and the following conditions: 
 (i) Participant shall not render services
for any organization or engage, directly or indirectly, in any business which, in the judgment of the Plan Administrator or, if delegated by the Plan Administrator to the Chief Executive Officer, in the judgment of such officer, is or becomes
competitive with the Corporation or any Affiliate, or which is or becomes otherwise prejudicial to or in conflict with the interests of the Corporation or any Affiliate. Such judgment shall be based on Participant’s positions and
responsibilities while employed by the Corporation or an Affiliate, Participant’s post-Service responsibilities and position with the other organization or business, the extent of past, current and potential competition or conflict between the
Corporation or an Affiliate and the other organization or business, the effect on customers, suppliers and competitors of Participant’s assuming the post-Service position and such other considerations as are deemed relevant given the applicable
facts and circumstances. Participant shall be free, however, to purchase as an investment or otherwise, stock or other securities of such organization or business so long as they are listed upon a recognized securities exchange or traded over the
counter, and such investment does not represent a substantial investment to Participant or a greater than one percent (1%) equity interest in the organization or business. 

(ii) Participant shall not, without prior written authorization from the Corporation, disclose to anyone outside the Corporation, or use in
other than the Corporation’s business, any secret or confidential information, knowledge or data, relating to the business of the Corporation or an Affiliate in violation of his or her agreement with the Corporation or the Affiliate. 

(iii) Participant shall disclose promptly and assign to the Corporation or the Affiliate all right, title and interest in any invention or
idea, patentable or not, made or conceived by Participant during employment by the Corporation or the Affiliate, relating in any manner to the actual or anticipated business, research or development work of the Corporation or the Affiliate and shall
do anything reasonably necessary to enable the Corporation or the Affiliate to secure a patent where appropriate in the United States and in foreign countries. 

(iv) Participant shall not in any way, directly or indirectly (a) induce or attempt to induce any employee of the Corporation to quit
employment with the Corporation; (b) otherwise interfere with or disrupt the Corporation’s relationship with its employees; (c) solicit, entice, or hire away any employee of the Corporation; or (d) hire or engage any employee of
the Corporation or any former employee of the Company whose employment with the Corporation ceased less than one (1) year before the date of such hiring or engagement. 

  
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 (v) Participant will not divert or attempt to divert from the Corporation any business the
Corporation had enjoyed or solicited from its customers during the two (2) years prior to the diversion or attempted diversion of such business. 

(vi) Participant shall not make any disparaging statements about the Corporation to any of the Corporation’s past, present, or future
customers, employees, clients, contractors, vendors, 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, product, service, quality, confidence, or good character of
the Corporation. 
 (b) Notwithstanding any other provision of the Plan or this Agreement, the Plan Administrator in its sole discretion may
cancel this Award at any time prior to the issuance of the Shares, if the employment of Participant shall be terminated, other than by reason of death, unless the conditions in this Section 9 are met. 

(c) Failure to comply with the conditions of this Section 9 prior to, or during the six months after, any payment or delivery pursuant to
this Award shall cause the issuance of the Shares to be rescinded. The Corporation shall notify Participant in writing of any such rescission within two (2) years after such delivery of the Shares and within ten (10) days after receiving
such notice, Participant shall either return the delivered Shares to the Corporation or pay to the Corporation the amount of the proceeds recognized upon any sale or other disposition of those Shares. 

(d) Upon delivery of the Shares pursuant to this Award, the Plan Administrator may require Participant to certify on a form acceptable to the
Plan Administrator, that Participant is in compliance with the terms and conditions of the Plan and this Agreement. 
 (e) This Award, and
the right to receive and retain any Shares or cash payments covered by this Award, shall be subject to rescission, cancellation or recoupment, in whole or part, if and to the extent so provided under any “clawback” or similar policy of the
Corporation in effect on the Award Date or that may be established thereafter, including any modification or amendment thereto, or as required by the Sarbanes-Oxley Act of 2002, the Dodd-Frank Wall Street Reform and Consumer Protection Act, or other
applicable law. 
 10. Notices. Any notice required to be given or delivered to the Secretary of the Corporation under the terms of
this Agreement shall be in writing and addressed to the Corporation at its principal corporate office at 436 Seventh Avenue, Pittsburgh, PA 15219. Except to the extent electronic notice is expressly authorized hereunder, any notice required to be
given or delivered to Participant shall be in writing and addressed to Participant at the address indicated below Participant’s signature line on this Agreement. All notices shall be deemed effective upon personal delivery (or electronic
delivery to the extent authorized hereunder) or upon deposit in the U.S. mail, postage prepaid and properly addressed to the party to be notified. 

11. Successors and Assigns. Except to the extent otherwise provided in this Agreement, the provisions of this Agreement shall inure to
the benefit of, and be binding upon, the Corporation and its successors and assigns and Participant, Participant’s assigns, the legal representatives, heirs and legatees of Participant’s estate and any beneficiaries of the Award designated
by Participant. 

  
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 12. Construction. This Agreement and the Award evidenced hereby are made and granted
pursuant to the Plan and are in all respects limited by and subject to the terms of the Plan. All decisions of the Plan Administrator with respect to any question or issue arising under the Plan or this Agreement shall be conclusive and binding on
all persons having an interest in the Award. 
 13. Governing Law. The interpretation, performance and enforcement of this Agreement
shall be governed by the laws of the Commonwealth of Pennsylvania without resort to Pennsylvania’s conflict-of-laws rules. 
 14.
Employment at Will. Nothing in this Agreement or in the Plan shall confer upon Participant any right to continue in Service for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Corporation
(or any Parent or Subsidiary employing or retaining Participant) or of Participant, which rights are hereby expressly reserved by each, to terminate Participant’s Service at any time for any reason, with or without cause, unless such rights are
otherwise limited pursuant to a separate agreement between the Corporation (or any Parent or Subsidiary) and Participant. 
 15.
Section 409A. This Award is intended to be excepted from coverage under, or compliant with the provisions of, Section 409 of the Code and the regulations promulgated thereunder (“Section 409A”) and shall be construed
accordingly. Notwithstanding the foregoing or any provision of the Plan to the contrary, if the Award is subject to the provisions of Section 409A (and not excepted therefrom), the provisions of the Plan and this Agreement shall be
administered, interpreted and construed in a manner necessary to comply with Section 409A (or disregarded to the extent such provision cannot be so administered, interpreted, or construed). If any payments or benefits hereunder may be deemed to
constitute nonconforming deferred compensation subject to taxation under the provisions of Section 409A, Participant agrees that the Corporation may, without the consent of Participant, modify the Agreement and the Award to the extent and in
the manner the Corporation deems necessary or advisable or take such other action or actions, including an amendment or action with retroactive effect, that the Corporation deems appropriate in order either to preclude any such payments or benefits
from being deemed “deferred compensation” within the meaning of Section 409A or to provide such payments or benefits in a manner that complies with the provisions of Section 409A such that they will not be taxable thereunder.
Notwithstanding, the Corporation makes no representations and/or warranties with respect to compliance with Section 409A, and Participant recognizes and acknowledges that Section 409A could potentially impose upon Participant certain taxes
or interest charges for which Participant is and shall remain solely responsible. 

  
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 IN WITNESS WHEREOF, the parties have executed this Agreement on the day and year
first indicated above. 
  

			
	KOPPERS HOLDINGS INC.
		
	By:		  

		
	Title:		  

 
			
		
	  
		, PARTICIPANT

 
			
		
	Signature:		  

		
	Address:		  

		
			  

  
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 APPENDIX A 

DEFINITIONS 
 The
following definitions shall be in effect under the Agreement: 
 A. Affiliate means any entity that, directly or through one or more
intermediaries, is controlled by the Corporation, and any entity in which the Corporation has a significant equity interest as determined by the Plan Administrator. 

B. Agreement shall mean this Restricted Stock Unit Issuance Agreement. 

C. Award shall mean the award of restricted stock units made to Participant pursuant to the terms of this Agreement. 

D. Award Date shall mean the date the restricted stock units are awarded to Participant pursuant to the Agreement and shall be the date
indicated in Paragraph 1 of the Agreement. 
 E. Board shall mean the Corporation’s Board of Directors. 

F. Change in Control of the Corporation shall have occurred in the event that: 

(i) a person, partnership, joint venture, corporation or other entity, or two or more of any of the foregoing acting as a
“person” within the meaning of Sections 13(d)(3) of the 1934 Act, other than the Corporation, a majority-owned subsidiary of the Corporation or an employee benefit plan of the Corporation or such subsidiary (or such plan’s related
trust), become(s) the “beneficial owner” (as defined in Rule 13d-3 under the Act) of fifty percent (50%) or more of the then outstanding voting stock of the Corporation; 

(ii) during any period of two consecutive years, individuals who at the beginning of such period constitute the Board (together
with any new Board member whose election by the Corporation’s Board or whose nomination for election by the Corporation’s stockholders, was approved by a vote of at least two-thirds of the Board members then still in office who either were
Board members at the beginning of such period or whose election or nomination for election was previously so approved) cease for any reason to constitute a majority of the Board members then in office; 

(iii) all or substantially all of the business of the Corporation is disposed of pursuant to a merger, consolidation or other
transaction in which the Corporation is not the surviving corporation or the Corporation combines with another company and is the surviving corporation (unless the Corporation’s stockholders immediately following such merger, consolidation,
combination, or other transaction beneficially own, directly or indirectly, more than fifty percent (50%) of the aggregate voting stock or other ownership interests of (x) the entity or entities, if any, that succeed to the business of the
Corporation or (y) the combined company); 

  
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 (iv) the closing of the sale of all or substantially all of the assets of the
Corporation or a liquidation or dissolution of the Corporation; or 
 (v) the acquisition, directly or indirectly, by any
person or related group of persons (other than the Corporation or a person that directly or indirectly controls, is controlled by, or is under common control with, the Corporation of beneficial ownership (within the meaning of Rule 13d-3 of the Act)
of securities possessing more than twenty percent (20%) of the total combined voting power of the Corporation’s outstanding securities pursuant to a tender or exchange offer made directly to the Corporation’s stockholders which the
Board does not recommend such stockholders to accept. 
 G. Code shall mean the Internal Revenue Code of 1986, as amended. 

H. Common Stock shall mean shares of the Corporation’s common stock. 

I. Corporation shall mean Koppers Holdings Inc., a Pennsylvania corporation, and any successor corporation to all or substantially all
of the assets or voting stock of Koppers Holdings Inc. which shall by appropriate action adopt the Plan. 
 J. Employee shall mean an
individual who is in the employ of the Corporation (or any Parent or Subsidiary), subject to the control and direction of the employer entity as to both the work to be performed and the manner and method of performance. 

K. Fair Market Value per share of Common Stock on any relevant date shall be determined in accordance with the following provisions:

 (i) If the Common Stock is at the time traded on the Nasdaq Global Market, then the Fair Market Value shall be the closing
selling price per share of Common Stock at the close of regular hours trading (i.e., before after-hours trading begins) on the Nasdaq Global Market on the date in question, as such price is reported by the National Association of Securities Dealers
for that particular Stock Exchange. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for which such quotation exists. 

(ii) If the Common Stock is at the time listed on any other Stock Exchange, then the Fair Market Value shall be the closing
selling price per share of Common Stock at the close of regular hours trading (i.e., before after-hours trading begins) on the date in question on the Stock Exchange determined by the Plan Administrator to be the primary market for the Common Stock,
as such price is officially quoted in the composite tape of transactions on such exchange. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last
preceding date for which such quotation exists. 
 L. Measurement Period shall mean the period over which the Performance Objective is
to be measured. That period shall be the three (3)-year period measured from January 1, 2015 to December 31, 2017. 

  
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 M. Misconduct shall mean the commission of any act of fraud, embezzlement or dishonesty by
Participant, any unauthorized use or disclosure by Participant of confidential information or trade secrets of the Corporation (or any Parent or Subsidiary), or any other intentional misconduct by Participant adversely affecting the business or
affairs of the Corporation (or any Parent or Subsidiary) in a material manner. The foregoing definition shall not in any way preclude or restrict the right of the Corporation (or any Parent or Subsidiary) to discharge or dismiss Participant or any
other person in the Service of the Corporation (or any Parent or Subsidiary) for any other acts or omissions, but such other acts or omissions shall not be deemed, for purposes of the Plan or this Agreement, to constitute grounds for termination for
Misconduct. 
 N. 1934 Act shall mean the Securities Exchange Act of 1934, as amended from time to time. 

O. Participant shall mean the person to whom the Award is made pursuant to the Agreement. 

P. Parent shall mean any corporation (other than the Corporation) in an unbroken chain of corporations ending with the Corporation,
provided each corporation in the unbroken chain (other than the Corporation) owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting power of all classes of stock in one of the other
corporations in such chain. 
 Q. Permanent Disability shall mean the inability of Participant to engage in any substantial gainful
activity by reason of any medically determinable physical or mental impairment which is expected to result in death or to be of continuous duration of twelve (12) months or more. 

R. Plan shall mean the Corporation’s Amended and Restated 2005 Long-Term Incentive Plan. 

S. Plan Administrator shall mean the committee(s) designated by the Board to administer the Plan. 

T. Retirement shall mean Participant’s voluntary termination from Service (i) on or after his attainment of age sixty five
(65), or (ii) on or after his attainment of age 55 with at least ten (10) years of service, or involuntary termination from Service with at least thirty (30) years of service other than in connection with a termination for Misconduct.
“Years of service” means Participant’s total number of years of “accumulated service” as such term is defined with respect to salaried employees under the Retirement Plan for Koppers Inc. (regardless of whether Participant
is eligible to receive a benefit under such plan). 
 U. Service shall mean Participant’s performance of services for the
Corporation (or any Parent or Subsidiary) in the capacity of an Employee, a non-employee member of the board of directors or a consultant or independent advisor. For purposes of this Agreement, Participant shall be deemed to cease Service
immediately upon the occurrence of either of the following events: (i) Participant no longer performs services in any of the foregoing capacities for the Corporation (or any Parent or Subsidiary) or (ii) the entity for which Participant
performs such services ceases to remain a Parent or Subsidiary of the Corporation, even though Participant may subsequently continue to perform services for that entity. Service shall not be 

  
 A-3 

 
deemed to cease during a period of military leave, sick leave or other personal leave approved by the Corporation; provided, however, that except to the extent otherwise required by
law or expressly authorized by the Plan Administrator or by the Corporation’s written policy on leaves of absence, no Service credit shall be given for vesting purposes for any period the Participant is on a leave of absence. 

V. Stock Exchange shall mean the American Stock Exchange, the Nasdaq Global Market or the New York Stock Exchange. 

W. Subsidiary shall mean any corporation (other than the Corporation) in an unbroken chain of corporations beginning with the
Corporation, provided each corporation (other than the last corporation) in the unbroken chain owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting power of all classes of stock in
one of the other corporations in such chain. 
 X. Withholding Taxes shall mean the federal, state and local income and employment
taxes required to be withheld by the Corporation in connection with the vesting and concurrent issuance of the shares of Common Stock under the Award, including any additional shares resulting from the dividend equivalent right provisions of the
Award. 

  
 A-4 

 SCHEDULE I 

PERFORMANCE OBJECTIVE 
 One hundred percent (100%) of
the Restricted Stock Units shall vest on March             , 2018, provided (i) the Participant continues in Service until March
            , 2018 and (ii) the realization of “Cumulative Koppers Value Added” of $            over the three
(3)-year period measured from January 1, 2015 to December 31, 2017 (the “Measurement Period”). 
 The actual number of Restricted Stock
Units to vest on March             , 2018 (provided Participant continues in Service until March             , 2018) shall
be determined in accordance with the following chart: 
  

											
	 Performance Level
	  	Performance
% of Target	 	Cumulative Koppers
Value Added	 	  	% of
Restricted
Stock Units
Vesting	 
	 Outstanding
	  	120% or more	 	$	_______________	  	  	 	200	% 
	 Target
	  	100%	 	$	_______________	  	  	 	100	% 
	 Threshold
	  	80%	 	$	_______________	  	  	 	50	% 
	 Below Threshold
	  	less than 80%	 				  	 	0	% 

 If the Corporation’s performance falls within the range of the Threshold and Target or the Target and Outstanding
achievement levels, then the number of Restricted Stock Units will be calculated based on a linear interpolation between the 80% and 100% levels or the 100% and the 120% levels, respectively. 

The term, “Cumulative Koppers Value Added” shall mean the cumulative Koppers Value Added over the Measurement Period. 

The term “Koppers Value Added” shall mean the Corporation’s earnings before the deduction of interest and taxes minus a capital charge of 15%
times the amount of capital committed to the Corporation, subject to such exclusions as may be approved by the Corporation’s Management Development and Compensation Committee in its discretion. 

  
 A-5EX-10.100

 Exhibit 10.100 

KOPPERS HOLDINGS INC. 

NOTICE OF GRANT OF STOCK OPTION 

Notice is hereby given of the following option grant (the “Option”) to purchase shares of the Common Stock of Koppers Holdings Inc.
(the “Corporation”): 
 Optionee: 

Grant Date: 
 Vesting
Commencement Date: 
 Exercise Price: 

Number of Option Shares: 

Expiration Date: 
  

			
	Type of Option:		                             Incentive Stock Option
		
			                             Non-Statutory Stock Option

 Vesting Schedule: The Option shall become exercisable for 25% of the Option Shares upon
Optionee’s completion of a consecutive twelve (12)-month period of Service measured from the Vesting Commencement Date. The Option shall become exercisable for 25% of the Option Shares upon Optionee’s completion of a consecutive
twenty-four (24)-month period of Service measured from the Vesting Commencement Date. The Option shall become exercisable for 25% of the Option Shares upon Optionee’s completion of a consecutive thirty-six (36)-month period of Service
measured from the Vesting Commencement Date. The Option shall become exercisable for 25% of the Option Shares upon Optionee’s completion of a consecutive forty-eight (48)-month period of Service measured from the Vesting Commencement Date.
However, one or more Option Shares may be subject to accelerated vesting in accordance with Section 6 of the Stock Option Agreement. In no event shall the Option become exercisable for any additional Option Shares after Optionee’s
cessation of Service. 
 Optionee understands and agrees that the Option is granted subject to and in accordance with the terms of the
Koppers Holdings Inc. Amended and Restated 2005 Long Term Incentive Plan (the “Plan”). Optionee further agrees to be bound by the terms of the Plan and the terms of the Option as set forth in the Stock Option Agreement attached hereto as
Exhibit A. Optionee hereby acknowledges the receipt of a copy of the official prospectus for the Plan in the form attached hereto as Exhibit B. A copy of the Plan is available upon request made to the Corporate Secretary at the
Corporation’s principal offices. 

  
 Page 1 

 Employment at Will. Nothing in this Notice or in the attached Stock Option Agreement or in
the Plan shall confer upon Optionee any right to continue in Service for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Corporation (or any Parent or Subsidiary employing or retaining Optionee)
or of Optionee, which rights are hereby expressly reserved by each, to terminate Optionee’s Service at any time for any reason, with or without cause, unless such rights have otherwise been limited pursuant to a separate agreement between the
Corporation (or any Parent or Subsidiary) and the Participant. 
 Definitions. All capitalized terms in this Notice shall have the
meaning assigned to them in this Notice or in the attached Stock Option Agreement. 
 DATED:
                                        

  

			
	KOPPERS HOLDINGS INC.
		
	By:		  

		
	Title:		  

		
			  

 
			
		
	Address:		  

		
			  

 ATTACHMENTS  

Exhibit A - Stock Option Agreement 
 Exhibit B - Plan
Prospectus 

  
 Page 2 

 KOPPERS HOLDINGS INC. 

STOCK OPTION AGREEMENT 
 RECITALS 

A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the
board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any Parent or Subsidiary). 

B. Optionee is to render valuable services to the Corporation (or a Parent or Subsidiary), and this Agreement is executed pursuant to, and is
intended to carry out the purposes of, the Plan in connection with the Corporation’s grant of an option to Optionee. 
 C. All
capitalized terms in this Agreement shall have the meaning assigned to them in the attached Appendix. 
 NOW, THEREFORE, it is hereby agreed
as follows: 
 Grant of Option. The Corporation hereby grants to Optionee, as of the Grant Date, an option to purchase up to the
number of Option Shares specified in the Grant Notice. The Option Shares shall be purchasable from time to time during the option term specified in Paragraph 2 at the Exercise Price. 

Option Term. This option shall have a maximum term of ten (10) years measured from the Grant Date and shall accordingly expire at
the close of business on the Expiration Date, unless sooner terminated in accordance with Paragraph 5, 6 or 11. 
 Limited
Transferability. 
 This option shall be neither transferable nor assignable by Optionee other than by will or the laws of inheritance
following Optionee’s death and may be exercised, during Optionee’s lifetime, only by Optionee. However, Optionee may designate one or more persons as the beneficiary or beneficiaries of this option, and this option shall, in accordance
with such designation, automatically be transferred to such beneficiary or beneficiaries upon the Optionee’s death while holding this option. Such beneficiary or beneficiaries shall take the transferred option subject to all the terms and
conditions of this Agreement, including (without limitation) the limited time period during which this option may, pursuant to Paragraph 5, be exercised following Optionee’s death. 

If this option is designated a Non-Statutory Option in the Grant Notice, then this option may be assigned in whole or in part during
Optionee’s lifetime to one or more of the Optionee’s Family Members or to a trust established for the exclusive benefit of Optionee and/or one or more such Family Members, to the extent such assignment is in connection with the
Optionee’s estate plan or pursuant to a domestic relations order. The assigned portion shall be exercisable only by the person or persons who acquire a proprietary interest in the option pursuant to such assignment. The terms applicable to the
assigned portion shall be the same as those in effect for this option immediately prior to such assignment. 

 Dates of Vesting. This option shall become exercisable for the Option Shares in one or
more installments in accordance with the Vesting Schedule set forth in the Grant Notice. As the option becomes exercisable for such installments, those installments shall accumulate, and the option shall remain exercisable for the accumulated
installments until the Expiration Date or sooner termination of the option term under Paragraph 5, 6 or 11. 
 Cessation of Service.
The option term specified in Paragraph 2 shall terminate (and this option shall cease to be outstanding) prior to the Expiration Date should any of the following provisions become applicable: 

Except as otherwise provided in subparagraphs (b), (c), (d), (e) and (h) of this Paragraph 5, should Optionee cease to remain in
Service for any reason while this option is outstanding, then Optionee (or any person or persons to whom this option is transferred pursuant to a permitted transfer under Paragraph 3) shall have a ninety (90)-day period measured from the date of
such cessation of Service during which to exercise this option, but in no event shall this option be exercisable at any time after the Expiration Date. 

Should Optionee cease to remain in Service due to Optionee’s voluntary resignation while this option is outstanding, then Optionee (or
any person or persons to whom this option is transferred pursuant to a permitted transfer under Paragraph 3) shall have a thirty (30)-day period measured from the date of such cessation of Service during which to exercise this option, but in no
event shall this option be exercisable at any time after the Expiration Date. 
 Should Optionee die while this option is outstanding, then
this option may be exercised by (i) the personal representative of Optionee’s estate or (ii) the person or persons to whom the option is transferred pursuant to Optionee’s will or the laws of inheritance following Optionee’s
death or to whom the option is transferred during Optionee’s lifetime pursuant to a permitted transfer under Paragraph 3, as the case may be. However, if Optionee dies while holding this option and has an effective beneficiary designation in
effect for this option at the time of his or her death, then the designated beneficiary or beneficiaries shall have the exclusive right to exercise this option following Optionee’s death. Any such right to exercise this option shall lapse, and
this option shall cease to be outstanding, upon the earlier of (i) the expiration of the twelve (12)-month period measured from the date of Optionee’s death or (ii) the Expiration Date. 

Should Optionee cease Service by reason of Permanent Disability while this option is outstanding, then Optionee (or any person or persons to
whom this option is transferred pursuant to a permitted transfer under Paragraph 3) shall have a twelve (12)-month period measured from the date of such cessation of Service during which to exercise this option. In no event shall this option be
exercisable at any time after the Expiration Date. 
 Should Optionee cease Service by reason of Retirement while this option is
outstanding, then Optionee (or any person or persons to whom this option is transferred pursuant to a permitted transfer under Paragraph 3) shall have a three (3)-year period measured from the date of Optionee’s Retirement during which to
exercise this option. In no event shall this option be exercisable at any time after the Expiration Date. 

  
 4 

 The applicable period of post-Service exercisability in effect pursuant to the foregoing
provisions of this Paragraph 5 shall automatically be extended by an additional period of time equal in duration to any interval within such post-Service exercise period during which the exercise of this option or the immediate sale of the Option
Shares acquired under this option cannot be effected in compliance with applicable federal and state securities laws, but in no event shall such an extension result in the extension of this option beyond the Expiration Date. 

During the limited period of post-Service exercisability, this option may not be exercised in the aggregate for more than the number of
Option Shares for which this option is, at the time of Optionee’s cessation of Service, vested and exercisable pursuant to the Exercise Schedule specified in the Grant Notice or the special vesting acceleration provisions of Paragraph 6. This
option shall not vest or become exercisable for any additional Option Shares, whether pursuant to the normal Exercise Schedule specified in the Grant Notice or the special vesting acceleration provisions of Paragraph 6, following the Optionee’s
cessation of Service, except to the extent (if any) specifically authorized by the Plan Administrator pursuant to an express written agreement with the Optionee. Upon the expiration of such limited exercise period or (if earlier) upon the Expiration
Date, this option shall terminate and cease to be outstanding for any exercisable Option Shares for which the option has not otherwise been exercised. 

Should Optionee’s Service be terminated for Misconduct or should Optionee otherwise engage in any Misconduct while this option is
outstanding, then this option shall terminate immediately and cease to remain outstanding. 
 Special Acceleration of Option. 

Should the Optionee’s Service terminate by reason of his or her Retirement, death or Permanent Disability prior to the final vesting
date for the Option, then the Option shall immediately vest in the additional number of Option Shares (if any) in which the Optionee would have been vested at the time of such termination had 25% of the Option Shares that were scheduled to be vested
on the next anniversary of the Vesting Commencement Date instead vested in a series of twelve (12) successive equal monthly installments over the duration of the twelve (12) month period preceding such anniversary. 

This option, to the extent outstanding at the time of a Change in Control but not otherwise fully exercisable, shall automatically accelerate
so that this option shall, immediately prior to the effective date of such Change in Control, become exercisable for all of the Option Shares at the time subject to this option and may be exercised for any or all of those Option Shares as fully
vested shares of Common Stock. However, this option shall not become exercisable on such an accelerated basis, if and to the extent: (i) this option is to be assumed by the successor corporation (or parent thereof) or is otherwise to be
continued in full force and effect pursuant to the terms of the Change in Control transaction or (ii) this option is to be replaced with a cash retention program of the successor corporation which preserves the spread existing at the time of
the Change in Control on any Option Shares for which this option is not otherwise at that time exercisable (the excess of the Fair Market Value of those Option Shares over the aggregate Exercise Price payable for such shares) and provides for
subsequent payout of that spread in accordance with the same Vesting Schedule for those Option Shares as set forth in the Grant Notice. 

  
 5 

 Immediately following the Change in Control, this option shall terminate and cease to be
outstanding, except to the extent assumed by the Successor Corporation (or parent thereof) or otherwise continued in effect pursuant to the terms of the Change in Control transaction. 

If this option is assumed in connection with a Change in Control or otherwise continued in effect, then this option shall be appropriately
adjusted, immediately after such Change in Control, to apply to the number and class of securities into which the shares of Common Stock subject to this option would have been converted in consummation of such Change in Control had those shares
actually been outstanding at the time. Appropriate adjustments shall also be made to the Exercise Price, provided the aggregate Exercise Price shall remain the same. To the extent the actual holders of the Corporation’s outstanding Common Stock
receive cash consideration for their Common Stock in consummation of the Change in Control, the successor corporation may, in connection with the assumption or continuation of this option, substitute one or more shares of its own common stock with a
fair market value equivalent to the cash consideration paid per share of Common Stock in such Change in Control, provided such common stock is readily tradable on an established U.S. securities exchange or market. 

In the event the Optionee’s Service is involuntarily terminated for reasons other than Misconduct within twenty-four (24) months
following a Change in Control transaction which does not result in the accelerated vesting of this option pursuant to the provisions of subparagraph (b) of this Paragraph 6, then the option (as assumed or continued in effect) shall
automatically vest in full on an accelerated basis so that such option shall immediately become exercisable for all the Option Shares as fully-vested shares and may be exercised for any or all of those Option Shares as vested shares. 

This Agreement shall not in any way affect the right of the Corporation to adjust, reclassify, reorganize or otherwise change its capital or
business structure or to merge, consolidate, dissolve, liquidate or sell or transfer all or any part of its business or assets. 

Adjustment in Option Shares. In the event of any of the following transactions affecting the outstanding Common Stock as a class
without the Corporation’s receipt of consideration: any stock split, stock dividend, spin-off transaction, extraordinary distribution (whether in cash, securities or other property), recapitalization, combination of shares, exchange of shares
or other similar transaction affecting the outstanding Common Stock without the Corporation’s receipt of consideration or in the event of a substantial reduction to the value of the outstanding shares of Common Stock by reason of a spin-off
transaction or extraordinary distribution, then equitable adjustments shall be made to (i) the total number and/or class of securities subject to this option and (ii) the Exercise Price in such manner as the Plan Administrator deems
appropriate in order to reflect such change and thereby prevent the dilution or enlargement of benefits hereunder. 
 Stockholder
Rights. The holder of this option shall not have any stockholder rights with respect to the Option Shares until such person shall have exercised the option, paid the Exercise Price and become a holder of record of the purchased shares. 

  
 6 

 Manner of Exercising Option. 

In order to exercise this option with respect to all or any part of the Option Shares for which this option is at the time exercisable,
Optionee (or any other person or persons exercising the option) must take the following actions: 
 Execute and deliver to the Corporation
a Notice of Exercise for the Option Shares for which the option is exercised or comply with such other procedures as the Corporation may establish for notifying the Corporation of the exercise of this option for one or more Option Shares. 

Pay the aggregate Exercise Price for the purchased shares in one or more of the following forms: 

cash or check made payable to the Corporation; 

shares of Common Stock valued at Fair Market Value on the Exercise Date and held by Optionee (or any other person or persons exercising the
option) for any required period necessary to avoid a charge to the Corporation’s earnings for financial reporting purposes; or 

through a special sale and remittance procedure pursuant to which Optionee (or any other person or persons exercising the option) shall
concurrently provide irrevocable instructions (i) to a brokerage firm (reasonably satisfactory to the Corporation for purposes of administering such procedure in accordance with the Corporation’s pre-clearance/pre-notification policies) to
effect the immediate sale of the purchased shares and remit to the Corporation, out of the sale proceeds available on the settlement date, sufficient funds to cover the aggregate Exercise Price payable for the purchased shares plus all applicable
income and employment taxes required to be withheld by the Corporation by reason of such exercise and (ii) to the Corporation to deliver the certificates (which may be in electronic form) for the purchased shares directly to such brokerage firm
on such settlement date in order to complete the sale. 
 Except to the extent the sale and remittance procedure is utilized in connection
with the option exercise, payment of the Exercise Price must accompany the Notice of Exercise (or other notification procedure) delivered to the Corporation in connection with the option exercise. 

Furnish to the Corporation appropriate documentation that the person or persons exercising the option (if other than Optionee) have the right
to exercise this option. 
 Make appropriate arrangements with the Corporation (or Parent or Subsidiary employing or retaining Optionee)
for the satisfaction of all applicable income and employment tax withholding requirements applicable to the option exercise. 
 As soon as
practical after the Exercise Date, the Corporation shall issue to or on behalf of Optionee (or any other person or persons exercising this option) a certificate (which may be in electronic form) for the purchased Option Shares, with the appropriate
legends affixed thereto. 

  
 7 

 In no event may this option be exercised for any fractional shares. 

Compliance with Laws and Regulations. 

The exercise of this option and the issuance of the Option Shares upon such exercise shall be subject to compliance by the Corporation and
Optionee with all applicable requirements of law relating thereto and with all applicable regulations of any stock exchange on which the Common Stock may be listed for trading at the time of such exercise and issuance. 

The inability of the Corporation to obtain approval from any regulatory body having authority deemed by the Corporation to be necessary to
the lawful issuance and sale of any Common Stock pursuant to this option shall relieve the Corporation of any liability with respect to the non-issuance or sale of the Common Stock as to which such approval shall not have been obtained. The
Corporation, however, shall use commercially reasonable efforts to obtain all such approvals. 
 Additional Conditions. 

(a) The Corporation may cancel this option, and the Optionee shall thereupon cease to have any further right to acquire any shares of Common
Stock under such cancelled option, at any time the Optionee is not in compliance with this Agreement, the Plan and the following conditions: 

(i) Participant shall not render services for any organization or engage, directly or indirectly, in any business which, in the judgment of
the Plan Administrator or, if delegated by the Plan Administrator to the Chief Executive Officer, in the judgment of such officer, is or becomes competitive with the Corporation or any Affiliate, or which is or becomes otherwise prejudicial to or in
conflict with the interests of the Corporation or any Affiliate. Such judgment shall be based on Participant’s positions and responsibilities while employed by the Corporation or an Affiliate, Participant’s post-Service responsibilities
and position with the other organization or business, the extent of past, current and potential competition or conflict between the Corporation or an Affiliate and the other organization or business, the effect on customers, suppliers and
competitors of Participant’s assuming the post-Service position and such other considerations as are deemed relevant given the applicable facts and circumstances. Participant shall be free, however, to purchase as an investment or otherwise,
stock or other securities of such organization or business so long as they are listed upon a recognized securities exchange or traded over the counter, and such investment does not represent a substantial investment to Participant or a greater than
one percent (1%) equity interest in the organization or business. 
 (ii) Participant shall not, without prior written authorization
from the Corporation, disclose to anyone outside the Corporation, or use in other than the Corporation’s business, any secret or confidential information, knowledge or data, relating to the business of the Corporation or an Affiliate in
violation of his or her agreement with the Corporation or the Affiliate. 

  
 8 

 (iii) Participant shall disclose promptly and assign to the Corporation or the Affiliate all
right, title and interest in any invention or idea, patentable or not, made or conceived by Participant during employment by the Corporation or the Affiliate, relating in any manner to the actual or anticipated business, research or development work
of the Corporation or the Affiliate and shall do anything reasonably necessary to enable the Corporation or the Affiliate to secure a patent where appropriate in the United States and in foreign countries. 

(iv) Participant shall not in any way, directly or indirectly (a) induce or attempt to induce any employee of the Corporation to quit
employment with the Corporation; (b) otherwise interfere with or disrupt the Corporation’s relationship with its employees; (c) solicit, entice, or hire away any employee of the Corporation; or (d) hire or engage any employee of
the Corporation or any former employee of the Corporation whose employment with the Corporation ceased less than one (1) year before the date of such hiring or engagement. 

(v) Participant will not divert or attempt to divert from the Corporation any business the Corporation had enjoyed or solicited from its
customers during the two (2) years prior to the diversion or attempted diversion of such business. 
 (b) Notwithstanding any other
provision of the Plan or this Agreement, the Plan Administrator in its sole discretion may cancel this option at any time prior to the exercise thereof, if the employment of the Optionee shall be terminated, other than by reason of death, unless the
conditions in this Section 11 are met. 
 (c) Failure to comply with the conditions of this Section 11 prior to, or during the six
months after, any exercise of this option shall cause the exercise to be rescinded. The Corporation shall notify the Optionee in writing of any such rescission within two (2) years after such exercise and within ten (10) days after
receiving such notice, the Optionee shall pay to the Corporation the amount of any gain realized or payment received as a result of the exercise rescinded. Such payment shall be made either in cash or by returning to the Corporation the number of
shares that the Optionee received in connection with the rescinded exercise. 
 (d) Upon exercise of this option, the Plan Administrator may
require the Optionee to certify on a form acceptable to the Plan Administrator, that the Optionee is in compliance with the terms and conditions of the Plan and this Agreement. 

(e) This option, and the right to receive and retain any Option Shares or cash payments covered by this option, shall be subject to
rescission, cancellation or recoupment, in whole or part, if and to the extent so provided under any “clawback” or similar policy of the Corporation in effect on the Grant Date or that may be established thereafter, including any
modification or amendment thereto, or as required by the Sarbanes-Oxley Act of 2002, the Dodd-Frank Wall Street Reform and Consumer Protection Act, or other applicable law. 

Successors and Assigns. Except to the extent otherwise provided in Paragraphs 3 and 6, the provisions of this Agreement shall inure to
the benefit of, and be binding upon, the Corporation and its successors and assigns and Optionee, Optionee’s assigns, the legal representatives, heirs and legatees of Optionee’s estate and any beneficiaries of this option designated by
Optionee. 

  
 9 

 Notices. Any notice required to be given or delivered to the Secretary of the Corporation
under the terms of this Agreement shall be in writing and addressed to the Corporation at its principal corporate office at 436 Seventh Avenue, Pittsburgh, PA 15219. Any notice required to be given or delivered to Optionee shall be in writing and
addressed to Optionee at the address indicated below Optionee’s signature line on the Grant Notice. All notices shall be deemed effective upon personal delivery or upon deposit in the U.S. mail, postage prepaid and properly addressed to the
party to be notified. 
 Construction. This Agreement and the option evidenced hereby are made and granted pursuant to the Plan and
are in all respects limited by and subject to the terms of the Plan. All decisions of the Plan Administrator with respect to any question or issue arising under the Plan or this Agreement shall be conclusive and binding on all persons having an
interest in this option. 
 Governing Law. The interpretation, performance and enforcement of this Agreement shall be governed by the
laws of the Commonwealth of Pennsylvania without resort to Pennsylvania’s conflict-of-laws rules. 
 Excess Shares. If the
Option Shares covered by this Agreement exceed, as of the Grant Date, the number of shares of Common Stock which may without stockholder approval be issued under the Plan, then this option shall be void with respect to those excess shares, unless
stockholder approval of an amendment sufficiently increasing the number of shares of Common Stock issuable under the Plan is obtained in accordance with the provisions of the Plan. In no event shall the Option be exercisable with respect to any of
the excess Option Shares unless and until such stockholder approval is obtained. 
 Additional Terms Applicable to an Incentive
Option. In the event this option is designated an Incentive Option in the Grant Notice, the following terms and conditions shall also apply to the grant: 

This option shall cease to qualify for favorable tax treatment as an Incentive Option if (and to the extent) this option is exercised for one
or more Option Shares: (A) more than three (3) months after the date Optionee ceases to be an Employee for any reason other than death or Permanent Disability or (B) more than twelve (12) months after the date Optionee ceases to
be an Employee by reason of Permanent Disability. 
 No installment under this option shall qualify for favorable tax treatment as an
Incentive Option if (and to the extent) the aggregate Fair Market Value (determined at the Grant Date) of the Common Stock for which such installment first becomes exercisable hereunder would, when added to the aggregate value (determined as of the
respective date or dates of grant) of the Common Stock or other securities for which this option or any other Incentive Options granted to Optionee prior to the Grant Date (whether under the Plan or any other option plan of the Corporation or any
Parent or Subsidiary) first become exercisable during the same calendar year, exceed One Hundred Thousand Dollars ($100,000) in the aggregate. Should such One Hundred Thousand Dollar ($100,000) limitation be exceeded in any calendar year, this
option shall nevertheless become exercisable for the excess shares in such calendar year as a Non-Statutory Option. 

  
 10 

 Should the exercisability of this option be accelerated upon a Change in Control, then this
option shall qualify for favorable tax treatment as an Incentive Option only to the extent the aggregate Fair Market Value (determined at the Grant Date) of the Common Stock for which this option first becomes exercisable in the calendar year in
which the Change in Control transaction occurs does not, when added to the aggregate value (determined as of the respective date or dates of grant) of the Common Stock or other securities for which this option or one or more other Incentive Options
granted to Optionee prior to the Grant Date (whether under the Plan or any other option plan of the Corporation or any Parent or Subsidiary) first become exercisable during the same calendar year, exceed One Hundred Thousand Dollars ($100,000) in
the aggregate. Should the applicable One Hundred Thousand Dollar ($100,000) limitation be exceeded in the calendar year of such Change in Control, the option may nevertheless be exercised for the excess shares in such calendar year as a
Non-Statutory Option. 
 Should Optionee hold, in addition to this option, one or more other options to purchase Common Stock which become
exercisable for the first time in the same calendar year as this option, then for purposes of the foregoing limitations on the exercisability of such options as Incentive Options, this option and each of those other options shall be deemed to become
first exercisable in that calendar year, on the basis of the chronological order in which such options were granted, except to the extent otherwise provided under applicable law or regulation. 

  
 11 

 APPENDIX 

The following definitions shall be in effect under the Agreement: 

Affiliate means any entity that, directly or through one or more intermediaries, is controlled by the Corporation, and any entity in
which the Corporation has a significant equity interest as determined by the Plan Administrator. 
 Agreement shall mean this Stock
Option Agreement. 
 Board shall mean the Corporation’s Board of Directors. 

Change in Control of the Corporation shall have occurred in the event that: 

(i) a person, partnership, joint venture, corporation or other entity, or two or more of any of the foregoing acting as a “person”
within the meaning of Sections 13(d)(3) of the 1934 Act, other than the Corporation, a majority-owned subsidiary of the Corporation or an employee benefit plan of the Corporation or such subsidiary (or such plan’s related trust), become(s) the
“beneficial owner” (as defined in Rule 13d-3 under the Act) of fifty percent (50%) or more of the then outstanding voting stock of the Corporation; 

(ii) during any period of two consecutive years, individuals who at the beginning of such period constitute the Board (together with any new
Board member whose election by the Corporation’s Board or whose nomination for election by the Corporation’s stockholders, was approved by a vote of at least two-thirds of the Board members then still in office who either were Board
members at the beginning of such period or whose election or nomination for election was previously so approved) cease for any reason to constitute a majority of the Board members then in office; 

(iii) all or substantially all of the business of the Corporation is disposed of pursuant to a merger, consolidation or other transaction in
which the Company is not the surviving corporation or the Corporation combines with another company and is the surviving corporation (unless the Corporation’s stockholders immediately following such merger, consolidation, combination, or other
transaction beneficially own, directly or indirectly, more than fifty percent (50%) of the aggregate voting stock or other ownership interests of (x) the entity or entities, if any, that succeed to the business of the Corporation or
(y) the combined company); 
 (iv) the closing of the sale of all or substantially all of the assets of the Corporation or a
liquidation or dissolution of the Corporation; or 
 (v) the acquisition, directly or indirectly, by any person or related group of persons
(other than the Corporation or a person that directly or indirectly controls, is controlled by, or is under common control with, the Corporation) of beneficial ownership (within the meaning of Rule 13d-3 of the Act) of securities possessing more
than twenty percent (20%) of the total combined voting power of the Corporation’s outstanding securities pursuant to a tender or exchange offer made directly to the Corporation’s stockholders which the Board does not recommend such
stockholders to accept. 

  
 A-1 

 Code shall mean the Internal Revenue Code of 1986, as amended. 

Common Stock shall mean shares of the Corporation’s common stock. 

Corporation shall mean Koppers Holdings Inc., a Pennsylvania corporation, and any successor corporation to all or substantially all of
the assets or voting stock of Koppers Holdings Inc. which shall by appropriate action adopt the Plan. 
 Employee shall mean an
individual who is in the employ of the Corporation (or any Parent or Subsidiary), subject to the control and direction of the employer entity as to both the work to be performed and the manner and method of performance. 

Exercise Date shall mean the date on which the option shall have been exercised in accordance with Paragraph 9 of the Agreement. 

Exercise Price shall mean the exercise price per Option Share as specified in the Grant Notice. 

Expiration Date shall mean the date on which the option expires as specified in the Grant Notice. 

Fair Market Value per share of Common Stock on any relevant date shall be determined in accordance with the following provisions: 

If the Common Stock is at the time traded on the Nasdaq Global Market, then the Fair Market Value shall be the closing selling price per share
of Common Stock at the close of regular hours trading (i.e., before after-hours trading begins) on the Nasdaq Global Market on the date in question, as such price is reported by the National Association of Securities Dealers for that particular
Stock Exchange. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for which such quotation exists. 

If the Common Stock is at the time listed on any other Stock Exchange, then the Fair Market Value shall be the closing selling price per
share of Common Stock at the close of regular hours trading (i.e., before after-hours trading begins) on the date in question on the Stock Exchange determined by the Plan Administrator to be the primary market for the Common Stock, as such price is
officially quoted in the composite tape of transactions on such exchange. If there is no closing selling price for the Common Stock on the date in question, then the Fair Market Value shall be the closing selling price on the last preceding date for
which such quotation exists. 
 Family Member shall mean any of the following members of the Optionee’s family: any child,
stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law. 

Grant Date shall mean the date of grant of the option as specified in the Grant Notice. 

  
 A-2 

 Grant Notice shall mean the Notice of Grant of Stock Option accompanying the Agreement,
pursuant to which Optionee has been informed of the basic terms of the option evidenced hereby. 
 Incentive Option shall mean an
option which satisfies the requirements of Code Section 422. 
 Misconduct shall mean the commission of any act of fraud,
embezzlement or dishonesty by Optionee, any unauthorized use or disclosure by Optionee of confidential information or trade secrets of the Corporation (or any Parent or Subsidiary), or any other intentional misconduct by Optionee adversely affecting
the business or affairs of the Corporation (or any Parent or Subsidiary) in a material manner. The foregoing definition shall not in any way preclude or restrict the right of the Corporation (or any Parent or Subsidiary) to discharge or dismiss
Optionee or any other person in the Service of the Corporation (or any Parent or Subsidiary) for any other acts or omissions, but such other acts or omissions shall not be deemed, for purposes of the Plan or this Agreement, to constitute grounds for
termination for Misconduct. 
 Non-Statutory Option shall mean an option not intended to satisfy the requirements of Code
Section 422. 
 Notice of Exercise shall mean the notice of option exercise in the form prescribed by the Corporation. 

Option Shares shall mean the number of shares of Common Stock subject to the option as specified in the Grant Notice. 

Optionee shall mean the person to whom the option is granted as specified in the Grant Notice. 

Parent shall mean any corporation (other than the Corporation) in an unbroken chain of corporations ending with the Corporation,
provided each corporation in the unbroken chain (other than the Corporation) owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting power of all classes of stock in one of the other
corporations in such chain. 
 Permanent Disability shall mean the inability of Optionee to engage in any substantial gainful
activity by reason of any medically determinable physical or mental impairment which is expected to result in death or to be of continuous duration of twelve (12) months or more. 

Plan shall mean the Corporation’s Amended and Restated 2005 Long Term Incentive Plan. 

Plan Administrator shall mean the committee(s) designated by the Board to administer the Plan. 

  
 A-3 

 Retirement shall mean the Participant’s voluntary termination from Service
(i) on or after his attainment of age sixty five (65), or (ii) on or after his attainment of age 55 with at least ten (10) years of service, or involuntary termination from Service with at least thirty (30) years of service other
than in connection with a termination for Misconduct. “Years of service” means the Participant’s total number of years of “accumulated service” as such term is defined with respect to salaried employees under the Retirement
Plan for Koppers Inc. (regardless of whether the Participant is eligible to receive a benefit under such plan). 
 Service shall mean
the Optionee’s performance of services for the Corporation (or any Parent or Subsidiary, whether now existing or subsequently established) by a person in the capacity of an Employee, a non-employee member of the board of directors or a
consultant or independent advisor. However, the Optionee shall be deemed to cease Service immediately upon the occurrence of either of the following events: (i) the Optionee no longer performs services in any of the foregoing capacities for the
Corporation or any Parent or Subsidiary or (ii) the entity for which the Optionee is performing such services ceases to remain a Parent or Subsidiary of the Corporation, even though the Optionee may subsequently continue to perform services for
that entity. Service shall not be deemed to cease during a period of military leave, sick leave or other personal leave approved by the Corporation; provided, however, that should such leave of absence exceed three (3) months,
then for purposes of determining the period within which the option may be exercised as an Incentive Stock Option under the federal tax laws (if the option is designated as such in the Grant Notice), the Optionee’s Service shall be deemed to
cease on the first day immediately following the expiration of such three (3)-month period, unless the Optionee is provided, either by statute or by written contract, with the right to return to Service following such leave. Except to the extent
otherwise required by law or expressly authorized by the Plan Administrator or by the Corporation’s written policy on leaves of absence, no Service credit shall be given for vesting purposes for any period the Optionee is on a leave of absence.

 Stock Exchange shall mean the American Stock Exchange, the Nasdaq Global Market or the New York Stock Exchange. 

Subsidiary shall mean any corporation (other than the Corporation) in an unbroken chain of corporations beginning with the Corporation,
provided each corporation (other than the last corporation) in the unbroken chain owns, at the time of the determination, stock possessing fifty percent (50%) or more of the total combined voting power of all classes of stock in one of the
other corporations in such chain. 
 Vesting Schedule shall mean the schedule set forth in the Grant Notice pursuant to which the
option is to become exercisable for the Option Shares in one or more installments over the Optionee’s period of Service. 

  
 A-4

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