Document:

Restricted Stock Unit Issuance Agreement - Performance Vesting

 Exhibit 10.63 
 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 February     , 2015, provided (i) the Participant continues in Service until February
    , 2015 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:	  	February     , 2012
		
	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 February     , 2015, provided (i) the Participant continues in Service until February     , 2015 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 February     , 2015 (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, and the number of Restricted Stock
Units will be reduced accordingly. 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 

  
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Shares been actually issued and outstanding and entitled to that dividend. 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. 
 (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 February
    , 2015, then on February     , 2015, Participant shall vest in a number of Shares equal to the number of Shares (if any) in which Participant would have been vested at February     ,
2015 had Participant continued in the Corporation’s Service through February     , 2015 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 February     , 2015. 
 (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 

  
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converted into the following vesting schedule: The Award (whether in its assumed or continued 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 February     , 2015. 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 twelve (12) 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 thirteenth (13th) 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 February     , 2015 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 twelve (12) 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 

  
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on or after the first day of the thirteenth (13th) month of the Measurement Period, a number of 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
February     , 2015. 
 (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 February     , 2015, 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, February     , 2015), 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 February     , 2015. 
 (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. 
 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. 

  
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 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. 
 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. 

  
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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, 2012 to December 31, 2014. 

  
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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), (ii) on or after his attainment of age sixty (60) with at least twenty-five (25) years of service, or (iii) 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

  
 A-3

 
Participant 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 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 February     , 2015, provided (i) the Participant continues in Service until February     , 2015 and (ii) the realization of “Cumulative Koppers Value Added” of
$        over the three (3)-year period measured from January 1, 2012 to December 31, 2014 (the “Measurement Period”). 

The actual number of Restricted Stock Units to vest on February     , 2015 (provided Participant continues in
Service until February     , 2015) 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	 	$	            	  	  	 	150	% 
	 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-5Notice of Grant of Stock Option

 Exhibit 10.64 
 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 
 Exercise Schedule: The Option shall become exercisable for all of the Option Shares upon Optionee’s completion of a consecutive three (3)-year 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. 
 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 

  
 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: 
 1. 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. 
 2. 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.

 3. Limited Transferability. 
 (a) 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. 
 (b) 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. 

  

 4. Dates of Exercise. This option shall become exercisable for the Option Shares in
one or more installments in accordance with the Exercise 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. 
 5.
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: 

(a) 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. 
 (b) 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. 
 (c) 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. 
 (d) 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.

 (e) 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. 

  
 2 

 (f) 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. 

(g) 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. 
 (h) 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. 
 6. Special Acceleration of Option. 

(a) Should the Optionee’s Service terminate by reason of his or her Retirement, death or Permanent Disability, then the Optionee
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 the Option Shares vested in a series of thirty-six (36) successive equal monthly
installments over the duration of the Exercise Schedule. 
 (b) 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 Exercise Schedule for those Option Shares as set forth in the Grant Notice. 

  
 3 

 (c) 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. 

(d) 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. 

(e) 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.

 (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. 
 7. 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. 
 8. 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. 

  
 4 

 9. Manner of Exercising Option. 

(a) 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: 
 (i) 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. 
 (ii) Pay the aggregate Exercise Price for the purchased shares in one or more of the following forms:

 (A) cash or check made payable to the Corporation; 

(B) 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 
 (C) 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. 
 (iii) 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. 

(iv) 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. 
 (b) 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. 

  
 5 

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

10. Compliance with Laws and Regulations. 
 (a) 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. 
 (b) 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. 
 11. 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. 
 (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 

  
 6 

 
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. 
 12. 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. 

13. 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 

  
 7 

 
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. 
 14. 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. 

15. 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. 
 16. 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. 
 17. 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: 
 (a) 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. 
 (b) 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. 
 (c) 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 

  
 8 

 
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. 

(d) 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. 

  
 9 

 APPENDIX 
 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 Stock Option Agreement. 
 C. Board shall mean the Corporation’s Board of Directors. 
 D.
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

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

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

G. 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. 
 H.
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.

 I. Exercise Date shall mean the date on which the option shall have been exercised in accordance with Paragraph 9 of
the Agreement. 
 J. Exercise Price shall mean the exercise price per Option Share as specified in the Grant Notice.

 K. Exercise 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. 
 L. Expiration
Date shall mean the date on which the option expires as specified in the Grant Notice. 
 M. 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. 
 N. 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. 

  
 A-2

 O. Grant Date shall mean the date of grant of the option as specified in the Grant
Notice. 
 P. 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. 
 Q. Incentive Option shall mean an option
which satisfies the requirements of Code Section 422. 
 R. 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. 
 S. Non-Statutory Option shall mean an option not intended to satisfy the
requirements of Code Section 422. 
 T. Notice of Exercise shall mean the notice of option exercise in the form
prescribed by the Corporation. 
 U. Option Shares shall mean the number of shares of Common Stock subject to the option
as specified in the Grant Notice. 
 V. Optionee shall mean the person to whom the option is granted as specified in the
Grant Notice. 
 W. 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. 
 X. 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. 

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

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

  
 A-3

 AA. Retirement shall mean the Participant’s voluntary termination from Service
(i) on or after his attainment of age sixty five (65), (ii) on or after his attainment of age sixty (60) with at least twenty-five (25) years of service, or (iii) 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). 

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

  
 A-4

  
 PROSPECTUS 
  
  

Koppers Holdings Inc. 
 2005 Long Term
Incentive Plan 
 As amended and restated effective October 27, 2011 
 Common Stock, par value $.01 per share 
 This prospectus describes stock options, stock
appreciation rights, restricted stock, restricted stock units, performance bonuses and other performance awards which may be granted under the 2005 Long Term Incentive Plan of Koppers Holdings Inc., as amended and restated effective March 16,
2010. Koppers Holdings Inc. may be referred to herein as “Koppers Holdings” or the “ Company.” 
 Up to 2,089,447 shares of
Koppers Holdings’ common stock may be issued under the Plan, subject to adjustment in certain events. Of the total, 1,193,970 shares may be issued in connection with any grant of incentive stock options under the Plan. As of October 27,
2011, 999,702 shares of common stock remain available for issuance under the Plan. 
 The common stock issuable under the Plan will be made
available either from authorized but unissued shares of common stock or from shares of common stock reacquired by the Company, including shares repurchased on the open market. 
 Keep this prospectus for future reference. 
  

	
	  
 This document is part of a prospectus covering shares of Koppers Holdings’
 common stock that have been registered under the Securities Act of 1933.
  

 You should rely only on the information which is contained or incorporated by reference in this prospectus in determining
whether to purchase common stock under the Plan. We have not authorized anyone to provide you with any additional or different information. 

Koppers Holdings Inc. 
 436 Seventh Avenue

 Pittsburgh, PA 15219 

(412) 227-2001 
 October 27, 2011

 TABLE OF CONTENTS 

 

					
	  	  	Page	 
	 2005 LONG TERM INCENTIVE PLAN
	  	 	1	  
		
	 General
	  	 	1	  
	 Administration
	  	 	2	  
	 Stock Options
	  	 	3	  
	 Exercise of Stock Options
	  	 	3	  
	 Stock Appreciation Rights
	  	 	4	  
	 Restricted Stock
	  	 	5	  
	 Restricted Stock Units
	  	 	5	  
	 Performance Bonuses and Long-Term Performance Awards
	  	 	6	  
	 Additional Rights upon Change in Control
	  	 	6	  
	 Withholding of Taxes
	  	 	8	  
	 Miscellaneous
	  	 	8	  
	 Possible Anti-Takeover Effect
	  	 	9	  
	 Additional Restrictions
	  	 	9	  
		
	 RESTRICTIONS ON RESALE
	  	 	10	  
		
	 Rule 144
	  	 	10	  
	 Section 16(b)
	  	 	10	  
	 Reporting Requirements
	  	 	11	  
		
	 FEDERAL INCOME TAX CONSEQUENCES
	  	 	12	  
		
	 INCENTIVE STOCK OPTIONS
	  	 	12	  
		
	 NON-STATUTORY STOCK OPTIONS
	  	 	16	  
		
	 STOCK APPRECIATION RIGHTS
	  	 	17	  
		
	 STOCK ISSUANCE/RESTRICTED STOCK
	  	 	17	  
		
	 RESTRICTED STOCK UNITS AND PERFORMANCE AWARDS
	  	 	18	  
		
	 FEDERAL TAX RATES
	  	 	20	  
		
	 ALTERNATIVE MINIMUM TAX
	  	 	21	  
		
	 ADDITIONAL INFORMATION
	  	 	22	  

 2005 LONG TERM INCENTIVE PLAN 

The following is a summary of the Plan. The summary does not purport to be complete and is subject in all respects to the provisions of the Plan. You can
obtain a copy of the Plan from the Secretary of Koppers Holdings at the address set forth on the cover page of this prospectus. 
 You also
should refer to your stock option agreement or other award agreement, and any amendments to your agreement, for information as to any additional terms, conditions or restrictions which may be applicable to your stock option or other Plan award.

 General 
 The Plan originally
was adopted by Koppers Holdings’ Board of Directors and approved by its shareholders on December 7, 2005. The Plan was amended and restated by Koppers Holdings’ Board of Directors effective March 16, 2010, and approved by its
shareholders on May 5, 2010. 
 The purposes of the Plan are to provide selected individuals in the service of Koppers Holdings, its
subsidiaries, and selected affiliates with the opportunity to acquire a proprietary interest in its growth and performance, to generate an increased incentive to contribute to its future success, and to enhance its ability to attract and retain
qualified individuals. 
 Individuals eligible to participate in the Plan include officers and employees, non-employee Board members and
consultants in the service of Koppers Holdings or its subsidiaries or selected affiliates. However, an employee who is a member of a collective bargaining unit will not be eligible to receive an award under the Plan, unless the collective bargaining
agreement covering that employee provides for his or her participation in the Plan. 
 The net number of shares of common stock which may be
issued and for which stock options and other awards may be made under the Plan is limited to 2,089,447 shares, subject to adjustment and substitution in certain events. Of the total, 1,193,970 shares may be issued in connection with any grant of
incentive stock options under the Plan. 
 For stock option and stock appreciation right awards, the maximum number of shares which may be made
available to any one participant during any calendar year is 300,000 shares in the aggregate; provided, however, that for the calendar year in which a person first commences employment with the Company or its subsidiary or affiliate, this limitation
shall be increased to 500,000 shares. 
 For a performance award denominated in terms of shares (whether payable in shares, cash, or a
combination of both) or restricted stock award or restricted stock unit award that vests based on performance, the maximum number of shares for which such award may be made to a participant is 150,000 for each 12-month period included within the
applicable performance period or performance cycle for that award, with any such performance cycle limited to a maximum duration of 60 months and with pro-ration based on the foregoing for any period of less than 12 months included within the
applicable performance period or performance cycle. 
 For an award denominated in terms of cash dollars (whether payable in cash, shares, or a
combination of both), the maximum dollar amount for which an award may be made to a 

 
participant is $2,500,000 for each 12-month period included within the applicable performance period or performance cycle for that award, with any such performance cycle limited to a maximum
duration of 60 months and with pro-ration based on the foregoing for any period of less than 12 months included within the applicable performance period or performance cycle. 
 No awards may be granted under the Plan after March 15, 2020. 
 Administration

 Except as set forth in the next paragraph, the Plan is required to be administered by a committee appointed by the Board of Directors and
consisting of not less than two members of the Board who are (i) “non-employee” directors as such term is used under Rule 16b-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”),
(ii) “outside directors” within the meaning of that term under Section 162(m) of the Internal Revenue Code of 1986, as amended (the “Code”), and (iii) “independent” directors under the rules of the Stock
Exchange serving as the primary market for the Company’s common stock. The Board of Directors has appointed the Management Development and Compensation Committee to serve as the “committee” described above. 

With respect to awards made to Plan participants who are not officers or Board members subject to the short-swing trading restrictions of Section 16
of the Exchange Act (“Section 16 Insiders”), a “secondary committee” appointed by the Board may administer the Plan. As used herein, the term “Committee” means the Management Development and Compensation Committee as it
relates to administration with respect to awards to Section 16 Insiders, and the secondary committee, if one is appointed, as it relates to administration with respect to awards to non-Section 16 Insiders (if none is appointed, it means
the Management Development and Compensation Committee for all awards). The Committee has the power to interpret the Plan and to prescribe rules and guidelines in connection with the operation of the Plan. 

The Committee has full authority, in its discretion, to grant awards under the Plan to eligible participants and to determine the participants to whom
awards will be granted and the number of shares to be covered by each award. 
 The Committee may grant the following types of awards:

  

	 	•	 	 stock options, 

  

	 	•	 	 stock appreciation rights, 

  

	 	•	 	 restricted stock, 

  

	 	•	 	 restricted stock units, 

  

	 	•	 	 performance bonuses, and 

  

	 	•	 	 long-term performance awards. 

 Each of these types of awards is described below. 
 The grant of all awards will be confirmed by
an agreement between Koppers Holdings and the awardee. Before executing an award agreement, the awardee shall receive a copy of the Plan. 

  
 -2-

 Stock Options 
 Types of Stock Options. The Committee may grant either “incentive stock options” or “nonstatutory stock options”, except that incentive stock options may only be granted
to employees. Non-employee directors and consultants may be granted nonstatutory stock options. Incentive stock options are stock options which qualify for special federal income tax treatment under Section 422 of the Code. Nonstatutory stock
options are stock options which do not qualify under Section 422 of the Code. The federal income tax consequences of both types of options are described below under “Federal Income Tax Consequences.” 

Option Price. The option price for each stock option is determined by the Committee at the time a stock option is granted and is set forth
in the applicable stock option agreement. The option price may not be less than 100% of the fair market value of the common stock on the date the stock option is granted, except in connection with the assumption or substitution of awards in
accordance with Section 424(a) of the Code. 
 Fair Market Value. If the common stock is at the time listed on any national
securities exchange, then the fair market value will be the closing selling price per share at the close of regular hours trading (i.e., before after-hours trading begins) on the date in question on the exchange serving as the primary market for the
common stock, as such price is officially quoted by the National Association of Securities Dealers (if primarily traded on the Nasdaq Global or Global Select Market) or on the composite tape of transactions on any other primary 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. The Plan contains alternative provisions for determining
the fair market value of common stock if it cannot be determined pursuant to foregoing valuation procedures. 
 General Option
Terms. At the time a stock option is granted, the Committee determines the date or dates (and/or the event or events) upon which the stock option will become exercisable and the date on which the maximum option term will expire. These dates
(or events) are set forth in your stock option agreement. No stock option may be exercised more than ten years after its date of grant. The Committee will also determine the provisions governing whether, and the extent to which, a stock option may
be exercised following termination of employment or service, which provisions will be included in your stock option agreement. 

Transferability. An incentive stock option is transferable by an optionee only by will or by the laws of descent and distribution and may
be exercised during the optionee’s lifetime only by the optionee. Nonstatutory stock options may be transferred by gift to any member of the holder’s immediate family or to a trust for the benefit of the optionee or one or more immediate
family members, if permitted in the applicable stock option agreement. 
 Other Terms and Conditions. Subject to the foregoing and
the other provisions of the Plan, a stock option granted under the Plan is exercisable at such times and in such amounts and is subject to such other terms, conditions and restrictions, if any, as are determined, in its discretion, by the Committee
and set forth in the stock option agreement. 
 Exercise of Stock Options 
 A stock option is exercised by delivering to Koppers Holdings the completed exercise forms prescribed by the Committee and payment of the option price. You can obtain copies of the required exercise forms
from the Secretary of Koppers Holdings, at the address set forth on the cover page of the prospectus. 

  
 -3-

 The option price of the shares to be purchased is payable in full at the time of exercise. You should
consult your stock option agreement as to the methods of payment available for your particular stock option. Generally, you may pay the option price either in cash or by tendering to Koppers Holdings already-owned shares of common stock of Koppers
Holdings having a fair market value on the date of exercise equal to the option price to be paid, or by any combination of cash and such fair market value of common stock. Any portion of the option price representing a fraction of a share must be
paid in cash, and no shares of already-owned common stock which have been held for less than six months may be delivered in payment of the option price. 
 Cashless exercises are also permitted to the extent your option is exercised for vested shares of common stock. To use this procedure, you must provide irrevocable instructions to a brokerage firm
(reasonably acceptable to the Company for purposes of effecting such procedure in compliance with applicable pre-notification policies) to effect the immediate sale of the vested shares of common stock purchased under your option and to pay over to
the company, 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 withholding taxes. Concurrently with such instructions, you must also
direct the Company to deliver the certificates for the purchased shares to the brokerage firm in order to complete the sale. The Committee may provide in an applicable award agreement that a vested option that has an exercise price per share less
than the fair market value of each share subject to such vested option will be exercised automatically, by use of this sale and remittance procedure, on the last day of the option term. 
 Holders of incentive stock options should be aware that, generally, any sale of the shares received upon exercise of an incentive stock option within two years of the date of grant of the option or one
year of the date of exercise will constitute a “disqualifying disposition” resulting in loss of favorable Federal income tax treatment. See “Federal Income Tax Consequences”, below. Exercise of an incentive stock option through a
broker or other agent-sponsored program which finances the exercise through sale of the option shares would result in a “disqualifying disposition” of the shares sold. 
 Stock Appreciation Rights 
 Two types of stock appreciation rights may be granted under the
Plan, tandem stock appreciation rights and stand-alone stock appreciation rights. 
 Tandem Stock Appreciation Rights. A tandem
stock appreciation right is a right attached to a stock option grant that allows the holder to elect between the exercise of the option for shares of common stock or the surrender of that option for an appreciation distribution from Koppers Holdings
equal to the excess of (i) the fair market value of the vested shares subject to the surrendered option over (ii) the aggregate exercise price payable for those shares. The exercise of a tandem stock appreciation right must be approved by
the Committee. If so approved, the resulting distribution may be made in cash or in shares of common stock valued at fair market value on the exercise date, as the Committee deems appropriate. 

If the Committee disapproves the exercise of the tandem stock appreciation right, the optionee will retain whatever rights existed under the surrendered
option (or surrendered portion) and 

  
 -4-

 
may exercise those rights at any time before the later of (i) five (5) business days following notification of such disapproval or (ii) the last day on which the option is
otherwise exercisable in accordance with its terms, but in no event later than the expiration date of the maximum option term. 

Stand-alone Stock Appreciation Rights. A stand-alone stock appreciation right relates to a specified number of shares of common stock and
will upon exercise entitle the holder to receive a distribution from Koppers Holdings in an amount equal to the excess of (i) the fair market value (on the exercise date) of the shares of common stock as to which the right is exercised over
(ii) the aggregate base price in effect for those shares. The base price may not be less than the fair market value per share of the common stock on the grant date. Upon exercise of the stand-alone stock appreciation right, the resulting
distribution may be made in cash or shares of common stock valued at fair market value on the exercise date, as the Committee deems appropriate. The Committee may provide in an applicable award agreement that a stand-alone stock appreciation right
that has a base price per share less than the fair market value of each share subject to such vested right will be exercised automatically on the last day of the award term. 
 Restricted Stock 
 The Committee may award restricted stock to participants. Restricted
stock is subject to such restrictions as the Committee may determine (which may include restrictions on the right of the awardee to sell, assign, transfer or encumber the shares while subject to restriction) and are subject to forfeiture if certain
events specified by the Committee (which may, in the discretion of the Committee, include performance-based events) occur prior to the lapse of the restrictions. The restricted stock agreement between Koppers Holdings and the awardee will set forth
the number of shares of restricted stock awarded, the restrictions imposed thereon, the duration of such restrictions, the events the occurrence of which would cause a forfeiture of the restricted stock and such other terms and conditions as the
Committee in its discretion deems appropriate. If vesting is based solely on continued service, the term of the restrictions may not be less than three years. 
 Restricted Stock Units 
 The Committee may award restricted stock units to participants.
Each restricted stock unit represents the right to receive one share of common stock at a designated date following the vesting of that unit. Vesting may be tied to the attainment of pre-established performance milestones or the completion of
specified service requirements. Restricted stock units may be transferred or assigned, except in accordance with the awardee’s will or the laws of inheritance following his or her death. and are subject to forfeiture if the event the applicable
vesting requirements are not met (which may, in the discretion of the Committee, include performance-based vesting events). The restricted stock unit award between Koppers Holdings and the awardee will set forth the number of restricted stock units
awarded, the vesting schedule for those units, the date or dates on which the shares of common stock underlying the vested units will be issued and such other terms and conditions as the Committee in its discretion deems appropriate. If vesting is
based solely on continued service, the term of the restrictions may not be less than three years. 

  
 -5-

 Performance Bonuses and Long-Term Performance Awards 

The Committee may grant performance bonuses and long-term performance awards (together, “performance awards”) to participants. A performance
bonus is an award denominated in cash or shares and that is paid solely on account of the attainment of one or more specified performance targets in relation to one or more of the performance measures set forth in the Plan. A long-term performance
award may be structured as an award of restricted stock, restricted stock units or performance units with vesting tied to the attainment of pre-established performance milestones and the completion of specified service requirements. The award
agreement between Koppers Holdings and the awardee covering the performance bonus or long-term performance award will set forth the relevant performance measures, the target and maximum award amounts or number of shares or units, any restrictions
imposed thereon, the duration of such restrictions, the events the occurrence of which would cause a forfeiture of the award and such other terms and conditions as the Committee in its discretion deems appropriate. 

Performance bonuses and performance units will be paid in cash or shares, as determined by the Committee; performance-based restricted stock units and
restricted stock will be paid in shares. Performance bonuses will be paid as specified in the relevant award agreement and, in any event, no later than the 15th day of the third month following the end of the calendar year (or, if later, following
the end of the company’s fiscal year) in which such performance bonuses are no longer subject to a substantial risk of forfeiture, except to the extent that a participant has elected to defer payment under the terms of a duly authorized
deferred compensation arrangement that complies with the applicable requirements of Section 409A of the Code, in which case the terms of such arrangement shall govern. Performance units, performance-based restricted stock units and restricted
stock will be paid as specified in the relevant award agreement. 
 Additional Rights upon Change in Control 

Change in Control. The Plan provides for certain additional rights upon the occurrence of one of the following events (“Change in
Control Events”): 
  

	 	(1)	a person or group (other than Koppers Holdings, a majority-owned subsidiary or any employee benefit plan(s) sponsored by Koppers Holdings or a subsidiary) has acquired
beneficial ownership of securities representing 50% or more of Koppers Holdings’ voting power, 

  

	 	(2)	there is a change in the majority of the board of directors over a consecutive two-year period as a result of one or more contested elections for Board membership (but
excluding any Board member whose election was approved in connection with an actual or threatened proxy contest or threatened solicitation of proxies), 

  

	 	(3)	all or substantially all of the business of Koppers Holdings is disposed through a merger, consolidation, or other transaction in which Koppers Holdings is not the
surviving corporation, or in which Koppers Holdings combines with another company and is the surviving corporation, as a result of which Koppers Holdings’ shareholders immediately prior to the transaction will not hold a majority of the voting
power of the entities that succeed to the business or the combined company, 

  
 -6-

	 	(4)	the acquisition by a person or group of securities representing more than 20% of Koppers Holdings’ voting power through a hostile tender offer, or

  

	 	(5)	there is a shareholder-approved sale of all or substantially all of Koppers Holdings’ assets. 

The general consequences of a Change in Control Event on an outstanding award under the Plan may be summarized as follows: 

Stock Options and Stock Appreciation Rights. In the event of a Change in Control Event, all options and stock appreciation
rights outstanding under the Plan will automatically accelerate so that each such grant will, immediately prior to the effective date of the Change in Control Event, become exercisable as to all the shares of common stock at the time subject to that
option or stock appreciation right and may be exercised as to any or all of those shares as fully vested shares. However, the outstanding options and stock appreciation rights will not become exercisable on such an accelerated basis if and to
the extent: (i) the option or stock appreciation right is assumed by the successor corporation or otherwise continued in effect pursuant to the terms of the Change in Control Event or (ii) the acceleration of the option or stock
appreciation right is subject to other limitations imposed by the Committee in the agreement evidencing the award. 
 Any
incentive stock options accelerated upon the Change in Control Event will remain exercisable as incentive stock options under the federal tax laws only to the extent the applicable $100,000 limitation applicable to incentive stock options contained
in the Internal Revenue Code is not exceeded. If such limitation is exceeded, the option will be exercisable for the excess number of shares as nonstatutory stock option shares. 

Restricted Stock. In the event of a Change in Control Event, all unvested shares of common stock you hold will immediately
vest in full, unless the Company’s repurchase rights with respect to those shares are assigned to the acquiring company or are otherwise to continue in effect. In the event of such assignment or continuation of the repurchase rights, no vesting
acceleration will occur, and your shares will continue to vest, in accordance with the normal vesting schedule in effect for those shares, during your period of service with Koppers Holdings or the acquiring entity after the change in control.

 Restricted Stock Units and Performance Awards. Each of your outstanding restricted stock units and performance
awards may be assumed by the successor entity or otherwise continued in full force and effect. In such event, your restricted stock units and any performance awards denominated in shares will be adjusted immediately after the consummation of the
Change in Control Event so as to apply to the number and class of securities into which the shares of common stock subject to your units or performance awards immediately prior to the Change in Control Event would have been converted in consummation
of that Change in Control Event had those shares actually been issued and outstanding at that time. 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 Event, the successor corporation (or its parent company) may, in connection with the assumption or continuation of the outstanding restricted stock units or performance awards denominated in shares, 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 Event, provided such common stock is readily tradable on an established U.S. securities exchange or market.

  
 -7-

 If your restricted stock units or performance awards are not so assumed or otherwise
continued in effect, then those units will vest immediately prior to the closing of the Change in Control Event. Cash units will be paid immediately and shares subject to vested units will be issued immediately or will otherwise be converted into
the right to receive the same consideration per share of common stock payable to the other stockholders of Koppers Holdings in consummation of that Change in Control Event, subject in each instance to collection by Koppers Holdings of the applicable
withholding taxes. 
 To the extent an assumed award is subject to performance vesting upon the attainment of one or more
specified performance measures or other performance goals, then upon the assumption, continuation, or replacement of that award, the performance vesting condition shall automatically be cancelled and such award shall be converted into a service-only
vesting award that will vest upon completion of a service period ending with the portion of the performance period (and any subsequent vesting component that was originally part of the award) remaining at the time of the Change in Control Event.

 Special Acceleration Provisions. Some awards may contain a special acceleration feature pursuant to which the
award may become vested on an accelerated basis upon a Change in Control Event, whether or not those awards are assumed or otherwise continued in effect, or upon the subsequent termination of the awardee’s service under certain defined
circumstances. You should review the agreement evidencing your award under the Plan to determine whether your award contains such a special acceleration feature or other special features in connection with a Change in Control Event. 

Withholding of Taxes 
 Koppers Holdings
may be required to withhold income or employment taxes from employees in connection with the exercise of a stock option or stock appreciation right, at the time restricted stock is granted or vested or at the time shares of common stock become
issuable under vested restricted stock units or performance awards. The employee is required to make arrangements satisfactory to Koppers Holdings, in its discretion, for the satisfaction of any withholding tax obligations that arise in connection
with the Plan. 
 Miscellaneous 

The Plan contains provisions for proportionate adjustment in the option price of outstanding stock options, the exercise price of outstanding stock
appreciation rights, and the number of shares subject to each outstanding award in certain events, including stock dividends or splits and similar events. The Plan also contains provisions for the substitution of other securities, property or cash
for shares of common stock in the event of a reorganization, recapitalization, merger or similar event. 
 Koppers Holdings’ Board of
Directors may amend or terminate the Plan at any time, except that no amendment may be made without the approval of Koppers Holdings’ shareholders if shareholder approval of the amendment is at the time required by the rules of any stock
exchange on which the common stock is then listed. No amendment or termination of the Plan may adversely affect any outstanding award without the written consent of the holder of the award. 
 Neither the grant of any award nor anything contained in any award agreement gives any employee, or other participant any right to continue in the employment or service of Koppers

  
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Holdings or any subsidiary or interferes in any way with the rights of Koppers Holdings or an affiliate to terminate the employment of any employee or relationship with a participant at any time
or the rights of the shareholders of the Company or the Board to elect and remove non-employee directors. 
 The Plan is not governed by the
Employee Retirement Income Security Act of 1974, and it is not a qualified pension, profit sharing or stock bonus plan within the meaning of Section 401(a) of the Code. 
 Possible Anti-Takeover Effect 
 The provisions of the Plan providing for the acceleration of
the exercise date of stock options, stock appreciation rights and the lapse of restrictions applicable to restricted stock and restricted stock units and the vesting of performance goals upon the occurrence of a Change in Control Event may be
considered as having an anti-takeover effect. 
 Additional Restrictions 
 The Committee may cancel any unexpired, unpaid or deferred awards if at any time you are not in compliance with all applicable provisions of the award agreement, the Plan and the following additional
restrictions: 
 (i) You will not render services for any organization or engage, directly or indirectly, in any business which,
in the judgment of the Committee or, if delegated by the Committee to the Chief Executive Officer, in the judgment of such officer, is or becomes competitive with the Company or any affiliate, or which is or becomes otherwise prejudicial to or in
conflict with the interests of the Company or any affiliate. Such judgment will be based on your positions and responsibilities while employed by the Company or an affiliate, your post-employment responsibilities and position with the other
organization or business, the extent of past, current and potential competition or conflict between the Company or an affiliate and the other organization or business, the effect on customers, suppliers and competitors of your assuming the
post-employment position and such other considerations as are deemed relevant given the applicable facts and circumstances. You will 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 you or a greater than 1% equity interest in the organization or business.

 (ii) You will not, without prior written authorization from the Company, disclose to anyone outside the Company, or use in
other than the Company’s business, any secret or confidential information, knowledge or data, relating to the business of the Company or an affiliate in violation of your agreement with the Company or the affiliate. 

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

  
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 Notwithstanding any other provision of the Plan, the Committee in its sole discretion may cancel any award
at any time prior to the exercise thereof, if your employment is terminated, other than by reason of death, unless you comply with the foregoing restrictions. 
 Failure to comply with those restrictions prior to, or during the six months after, any exercise, payment or delivery pursuant to an award will cause that exercise, payment or delivery to be rescinded.
The Company will notify you in writing of any such rescission within two years after such exercise payment or delivery and within 10 days after receiving such notice, you must pay to the Company the amount of any gain realized or payment received as
a result of the exercise, payment or delivery rescinded. Such payment may be made either in cash or by returning to the Company the number of shares that you received in connection with the rescinded exercise, payment or delivery. 

Upon exercise, payment or delivery pursuant to an award, the Committee may require you to certify on a form acceptable to the Committee, that you are in
compliance with the terms and conditions of the Plan. 
 Any award granted under the Plan will be subject to any clawback or recoupment policy
adopted by the Company, as such policy may be amended from time to time, whether such policy is adopted before or after the award is granted. 
 RESTRICTIONS ON RESALE 
 Rule 144 

Sales of shares of common stock by persons who are deemed to be “affiliates” of Koppers Holdings, as that term is defined in regulations of the
Securities and Exchange Commission (the “SEC”) under the Securities Act of 1933 (the “Securities Act”), including shares acquired under the Plan, may only be made pursuant to an appropriate registration statement filed under the
Securities Act or pursuant to an applicable exemption from the registration requirements of the Securities Act. Koppers Holdings has not filed a registration statement covering the resale of any shares by affiliates. However, sales of shares of
common stock by affiliates may be made pursuant to Rule 144 under the Securities Act subject to certain limitations provided by Rule 144 concerning, among other things, the volume of securities which may be sold during any three-month period and the
manner of sale. A Form 144 may also be required to be filed by an affiliate with the SEC in regard to sales under Rule 144. The one-year holding period under Rule 144 does not apply to shares acquired under the Plan. 

Section 16(b) 
 Section 16(b)
of the 1934 Act requires the Company to recover any profit realized by any officer, director or beneficial owner of more than ten percent (10%) of the outstanding common stock (a “Section 16 Insider”) from any purchase and sale, or
sale and purchase, of such common stock made within a period of less than six (6) months. 
 The Securities and Exchange Commission (the
“SEC”) has issued a series of rules under Section 16(b) of the 1934 Act which govern the short-swing liability treatment of certain transactions effected by a Section 16 Insider under equity incentive plans such as the Plan. The
application of those rules to Plan transactions may be summarized as follows. 

  
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 Option Grant. The receipt of an option grant will not be treated as a purchase of the underlying
option shares for short-swing liability purposes. 
 Option Exercise. The exercise of a stock option under the Plan will be an exempt
transaction and will not be treated as a purchase of the acquired shares for short-swing liability purposes. 
 Delivery of Shares. The
delivery of shares of common stock in payment of the exercise price will be an exempt transaction for short-swing liability purposes. 

Stock Appreciation Right Transactions. The grant of a stock appreciation right will not be treated as a purchase of the underlying shares of
common stock subject to that grant. The exercise of a stock appreciation right for shares of common stock will not be treated as a purchase of the acquired shares for short-swing liability purposes. 

Receipt of Restricted Stock/Restricted Stock Units/Performance Awards. Your receipt of the restricted stock, restricted stock units or performance
awards will not be treated as a “purchase” of the underlying shares of common stock for short-swing liability purposes. 
 Vesting
of Restricted Stock/Restricted Stock Units/Performance Awards. The vesting of your restricted stock, restricted stock units or performance awards will not be taken into account for short-swing liability purposes. 

Issuance of Vested Shares. The issuance of vested shares pursuant to your restricted stock units or performance awards will not be treated as a
purchase of the acquired shares for short-swing liability purposes. 
 Stock Withholding. The withholding of a portion of the shares of
common stock otherwise issuable to the Section 16 Insider by the Company in satisfaction of the withholding taxes incurred in connection with the grant, exercise, vesting or issuance of any award under the Plan or the issuance of the underlying
shares of common stock will be an exempt transaction for short-swing liability purposes if such withholding is approved by the Committee, either at the time of such grant, exercise, vesting or issuance or at any earlier time. The delivery of shares
of common stock out of the Section 16 Insider’s existing investment portfolio in satisfaction of the applicable tax withholding liability will be an exempt transaction for short-swing liability purposes if approved by the Committee.

 Sale of Shares. The sale of any shares acquired under the Plan will be treated as a “sale” for short-swing liability
purposes and will be matched with any non-exempt purchases of common stock (e.g. open-market purchases) made within six (6) months before or after the date of such sale. 
 Reporting Requirements 
 Each of the following transactions involving the Section 16
Insider must be reported on a Form 4 within two (2) business days following the date on which such transaction occurs: 
  

	 	•	 	 Receipt of an option grant or stock appreciation right 

 

	 	•	 	 Receipt of restricted stock or restricted stock units that vest based on service 

  
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	 	•	 	 Exercise of an option grant or stock appreciation right 

 

	 	•	 	 Same day option exercise and sale 

  

	 	•	 	 Acquisition of shares pursuant to vested restricted stock units (but only if those restricted stock units were reported as derivative securities upon
their receipt rather than actual shares of common stock) 

  

	 	•	 	 Vesting of performance awards or any restricted stock or restricted stock units that vest based on performance milestones 

If the exercise price is paid with shares of common stock, then the disposition of those shares should also be reported on the same Form 4 for the option
exercise. 
 The sale of common stock must be reported on a Form 4 filed within two (2) business days after the date on which the sale is
effected (i.e., the trade date). 
 When shares of common stock acquired upon the exercise of a stock option or stock appreciation right are
withheld in satisfaction of applicable withholding taxes, the Section 16 Insider should report the gross number of shares acquired upon the exercise of such option or stock appreciation right (including the withheld shares) on the Form 4 filed
for the option or stock appreciation right exercised and should also report the disposition of the withheld shares on that same Form 4. Shares of common stock withheld in satisfaction of the withholding taxes applicable to share issuances pursuant
to vested restricted stock units or performance awards or upon the vesting of restricted stock should be reported on a Form 4 as a disposition of those shares. 
 FEDERAL INCOME TAX CONSEQUENCES 
 The following is a general description of the awards
granted under the Plan. State and local tax treatment, which is not discussed below, may vary from such federal income tax treatment. You should consult with your own tax advisor as to the tax consequences of your particular transactions under the
Plan. 
 INCENTIVE STOCK OPTIONS 
 T1. Will the grant of an incentive stock option result in federal income tax liability to me? 
 No. 
 T2. Will the exercise of an incentive stock option result in federal income tax liability
to me? 
 No. You will not recognize taxable income for regular income tax purposes at the time the incentive stock option is exercised.
However, the amount by which the fair market value (at the time of exercise) of the purchased shares exceeds the exercise price paid for those shares will constitute an adjustment to your income for purposes of the alternative minimum tax (see the
“Alternative Minimum Tax” section below). 

  
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 T3. Can an incentive stock option lose its tax qualified status? 

Yes. An option granted as an incentive stock option will be taxed as a nonstatutory option if exercised more than three (3) months after you
terminate employee status or more than twelve (12) months after such termination if due to your death or permanent disability. Certain amendments or modifications to an outstanding option may also cause the loss of incentive stock option
status, but no such amendment or modification may be made without your consent. 
 T4. When will I be subject to federal income tax on shares
acquired under an incentive stock option? 
 Generally, you will recognize income in the year in which you make a disposition of the shares
purchased under your incentive stock option. 
 T5. What constitutes a disposition of incentive stock option shares? 

A disposition of shares purchased under an incentive stock option will occur in the event you transfer legal title to those shares, whether by sale,
exchange or gift, or you deliver such shares in payment of the exercise price of any other incentive stock option you hold. However, a disposition will not occur if you engage in any of the following transactions: a transfer of the shares to your
spouse, a transfer into joint ownership with right of survivorship provided you remain one of the joint owners, a pledge of the shares as collateral for a loan, a transfer by bequest or inheritance upon your death or certain tax-free exchanges of
the shares permitted under the Code. 
 T6. How is my federal income tax liability determined when I dispose of my shares? 

Your federal income tax liability will depend upon whether you make a qualifying or disqualifying disposition of the shares purchased under your
incentive stock option. A qualifying disposition will occur if the sale or other disposition of the shares takes place more than two (2) years after the date the incentive stock option for the shares was granted and more than one (1) year
after the date that option was exercised for the particular shares involved in the disposition. A disqualifying disposition is any sale or other disposition made before both of these requirements are satisfied. 

T7. What if I make a qualifying disposition? 
 You will recognize a long-term capital gain equal to the excess of (i) the amount realized upon the sale or other disposition over (ii) the exercise price paid for the shares. You will recognize
a long-term capital loss if the amount realized is lower than the exercise price paid for the shares. (For the tax rates applicable to capital gain, please see Question T32.) 
 Example: On July 15, 2007, you are granted an incentive stock option for 1,000 shares with an exercise price of $24.00 per share. On July 15, 2009, you exercise the option for 500 vested shares
when the market price is $25.00 per share. The purchased shares are held until January 15, 2011, when you sell them for $26.00 per share. 

Because the disposition of the shares is made more than two (2) years after the grant date of the incentive stock option and more than one
(1) year after the option was exercised for the shares sold on January 15, 2009, the sale represents a qualifying disposition of such shares, and for federal income tax purposes, there will be a long-term capital gain of $2.00 per share.

  
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 T8. What are the normal tax rules for a disqualifying disposition? 

Normally, when you make a disqualifying disposition of shares purchased under an incentive stock option, you will recognize ordinary income at the time
of the disposition in an amount equal to the excess of (i) the fair market value of the shares on the option exercise date over (ii) the exercise price paid for those shares. If the disqualifying disposition is effected by means of an
arm’s length sale or exchange with an unrelated party in which a loss (if otherwise incurred) would be recognized for tax purposes, the ordinary income will be limited to the amount by which (i) the amount realized upon the disposition of
the shares or (ii) their fair market value on the exercise date, whichever is less, exceeds the exercise price paid for the shares. The amount of your disqualifying disposition income will be reported by the Company on your W-2 wage statement
for the year of disposition, and any applicable withholding taxes which arise in connection with the disqualifying disposition will be deducted from your wages or otherwise collected from you. 

Any additional gain recognized upon the disqualifying disposition will be capital gain, which will be long-term if the shares have been held for more
than one (1) year following the exercise date of the option. (See Question T32 below for the tax rates applicable to capital gain.) 

Example: On July 15, 2007, you are granted an incentive stock option for 1,000 shares with an exercise price of $24.00 per share. On July 15,
2009, you exercise this option for 500 vested shares when the market price is $25.00 per share. The purchased shares are held until March 15, 2010, when you sell them for $26.00 per share. 

Because the disposition of the shares is made less than one (1) year after the incentive stock option was exercised for the shares sold on
March 15, 2010, the sale represents a disqualifying disposition of the shares, and for federal income tax purposes, the gain upon the sale will be divided into two (2) components: 
 Ordinary Income: You will recognize ordinary income in the amount of $1.00 per share, the excess of the $25.00 per share market price of the shares on the date the option was exercised over the $24.00 per
share exercise price. 
 Capital Gain: You will also recognize a short-term capital gain of $1.00 per share with respect to each share sold.

 In the event the shares purchased under an incentive stock option are sold to an unrelated party in a disqualifying disposition for less than
the exercise price paid for those shares and the resulting loss is recognized for tax purposes, then you will not recognize any income but will recognize a capital loss equal to the excess of (i) the exercise price paid for the shares over
(ii) the amount realized upon the disposition of those shares. For example, if the shares in the above Example are sold for $22.00 per share in the disqualifying disposition, you would simply recognize a short-term capital loss of $2.00 per
share. 
 T9. What are the federal tax consequences to the Company? 
 If you make a qualifying disposition of shares acquired upon the exercise of an incentive stock option, then no income tax deduction may be taken by the Company with respect to such shares. Should you
make a disqualifying disposition of such shares, then the Company will be entitled to an income tax deduction equal to the amount of ordinary income you recognize in connection with the disposition. The deduction will, in general, be allowed to the
Company in the taxable year in which the disposition occurs. 

  
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 T10. What are the consequences of paying the exercise price of an incentive stock option in the form of
shares of common stock acquired upon the exercise of an earlier-granted incentive stock option if the delivery of the shares results in a disqualifying disposition? 
 If the delivery of the shares acquired under an earlier granted incentive stock option results in a disqualifying disposition, then you will be subject to ordinary income taxation on the excess of
(i) the fair market value of the delivered shares at the time of their original purchase (or at the time any forfeiture restriction applicable to those shares lapsed) over (ii) the exercise price paid for the delivered shares. 

The tax basis and capital gain holding periods for the shares of common stock purchased upon exercise of the incentive stock option will be determined as
follows: 
 (i) To the extent the purchased shares equal in number the delivered shares as to which there is a disqualifying disposition, the
basis for the new shares will be equal to the fair market value of the delivered shares at the time they were originally purchased, (or at the time any forfeiture restrictions applicable to those shares lapsed), and the capital gain holding period
for those shares will include the period for which the delivered shares were held (measured from their original purchase date or (if later) from the lapse date of any forfeiture restriction applicable to those shares). 

(ii) To the extent the number of purchased shares exceeds the number of delivered shares, the additional shares will have a zero basis and a capital gain
holding period measured (in general) from the exercise date. 
 T11. What are the consequences of paying the exercise price of an incentive
stock option in the form of shares of common stock (i) acquired under an incentive stock option and held for the requisite holding periods, (ii) acquired under a nonstatutory stock option or (iii) acquired through open-market
purchases? 
 If the exercise price for the incentive stock option is paid with shares of common stock (i) acquired under an incentive
stock option and held for the requisite minimum holding periods for a qualifying disposition, (ii) acquired under a nonstatutory stock option or (iii) acquired through open-market purchases, you will not recognize any taxable income (other
than as described in the “Alternative Minimum Tax” section below) with respect to the shares of common stock purchased upon exercise of the incentive stock option. To the extent the purchased shares equal in number the shares of common
stock delivered in payment of the exercise price, the new shares will have the same basis and holding period for capital gain purposes as the delivered shares. To the extent the number of purchased shares exceeds the number of delivered shares, the
additional shares will have a zero basis and a capital gain holding period measured (in general) from the exercise date. 
 T12. What are the
consequences of a subsequent disposition of shares purchased under an incentive stock option with shares of common stock? 
 If the
incentive stock option is exercised with shares of common stock, then those shares purchased under the incentive stock option which have a zero basis will be treated as the first 

  
 -15-

 
shares sold or otherwise transferred in a disqualifying disposition. Accordingly, upon such a disqualifying disposition, you will recognize ordinary income with respect to the zero basis shares
in an amount equal to their fair market value on the date the option was exercised for those shares or, if such shares were subject to any forfeiture restriction, on the date that restriction lapsed. Any additional gain upon such disqualifying
disposition will in most instances be taxed as short-term capital gain. 
 NON-STATUTORY STOCK OPTIONS 

T13. Will the grant of a nonstatutory stock option result in Federal income tax liability to me? 

No. 
 T14. Will the exercise of a
nonstatutory stock option result in Federal income tax liability to me? 
 Normally, you will recognize ordinary income in the year in which
the nonstatutory stock option is exercised in an amount equal to the excess of (i) the fair market value of the purchased shares on the exercise date over (ii) the exercise price paid for those shares. This income will be reported by the
Company on your W-2 wage statement for the year of exercise (or on a Form 1099 if you are not an employee), and you will be required to satisfy the tax withholding requirements applicable to this income. 

T15. Will I recognize additional income when I sell shares acquired under a nonstatutory stock option? 

Yes. You will recognize a capital gain to the extent the amount realized upon the sale of such shares exceeds their fair market value at the time you
recognized the ordinary income with respect to their acquisition. A capital loss will result to the extent the amount realized upon the sale is less than such fair market value. The gain or loss will be long-term if the shares are held for more than
one (1) year prior to the disposition. (Please see Question T28 below for the tax rates applicable to capital gain.) The holding period normally starts at the time the nonstatutory stock option is exercised. 

T16. What are the consequences of paying the exercise price of a nonstatutory stock option in the form of shares of common stock previously acquired
upon the exercise of employee options or through open-market purchases? 
 You will not recognize any taxable income to the extent the
shares of common stock received upon the exercise of the nonstatutory stock option equal in number the shares of common stock delivered in payment of the exercise price. For Federal income tax purposes, these newly-acquired shares will have the same
basis and capital gain holding period as the delivered shares. To the extent the delivered shares were acquired under an incentive stock option, the new shares received upon the exercise of the nonstatutory stock option will continue to be subject
to taxation as incentive stock option shares in accordance with the incentive stock option principles discussed above. 
 The additional shares
of common stock received upon the exercise of the nonstatutory stock option will, in general, have to be reported as ordinary income for the year of exercise in an amount equal to their fair market value on the exercise date. These additional shares
will have a tax basis equal to such fair market value and a capital gain holding period measured (in general) from the exercise date. 

  
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 T17. What are the Federal tax consequences to the Company? 

The Company will be entitled to an income tax deduction equal to the amount of ordinary income you recognize in connection with the exercise of the
nonstatutory stock option. The deduction will, in general, be allowed for the taxable year of the Company in which you recognize such ordinary income. 
 STOCK APPRECIATION RIGHTS 
 T18. Will the exercise of a stock appreciation right result
in Federal income tax liability to me? 
 Yes. Upon the exercise of a stock appreciation right for a distribution from the Company, you
will, in general, recognize ordinary income in an amount equal to that distribution. 
 T19. What are the Federal tax consequences to the
Company? 
 The Company will be entitled to an income tax deduction equal to the amount of ordinary income you recognize in connection with
the appreciation distribution. The deduction will, in general, be allowed for the taxable year of the Company in which you recognize such ordinary income. 
 STOCK ISSUANCES/RESTRICTED STOCK 
 T20. Will the issuance of vested shares result in
federal income tax liability to me? 
 Yes. Upon the issuance of vested shares, you will recognize ordinary income in an amount equal to the
excess of (1) the then fair market value of the issued shares over (2) the purchase price (if any) paid for such shares. 
 T21.
Will the issuance of unvested shares result in federal income tax liability to me? 
 If you are issued unvested shares of common stock
subject to the Company’s right to repurchase those shares upon your cessation of service, or subject to other substantial risk of forfeiture, and you do not make a Section 83(b) election at the time of such issuance, then you will not
recognize any taxable income with respect to those unvested shares at the time of acquisition. However, you will subsequently recognize ordinary income, as and when the Company’s repurchase right (or other substantial risk of forfeiture) lapses
with respect to the shares, in an amount equal to the excess of (1) the fair market value of the shares on the date the Company’s repurchase rights or other substantial risk of forfeiture lapse over (2) the purchase price (if any)
paid for the shares. 
 You may elect under Code Section 83(b) to recognize income at the time the unvested shares are issued to you (see
discussion of Section 83(b) election below). If such election is made, you will not recognize any additional income with respect to your unvested shares until such shares are sold or otherwise transferred in a taxable transaction. 

  
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 T22. What is the effect of making a Section 83(b) election? 

If you are issued shares subject to the Company’s repurchase right or other substantial risk of forfeiture, you may elect under Code
Section 83(b) to include as ordinary income in the year of issuance an amount equal to the excess of (1) the fair market value of the issued shares on the issue date over (2) the purchase price (if any) paid for the shares. The fair
market value of the issued shares will be determined as if the shares were not subject to the Company’s repurchase right or other substantial risk of forfeiture. If you make the Section 83(b) election, you will not recognize any additional
income when the Company’s repurchase right or other substantial risk of forfeiture subsequently lapses with respect to the shares. On the other hand, if you subsequently forfeit the shares, you will not be entitled to deduct the amount
previously paid in taxes. 
 The Section 83(b) election must be filed with the Internal Revenue Service within thirty days following the
date the shares are issued, and any ordinary income resulting from such election will be subject to applicable tax withholding requirements. 

T23. Will I recognize additional income when I sell shares acquired under the Plan? 
 Yes. You will recognize a capital gain to the extent the amount realized upon the sale of such shares exceeds their fair market value at the time you recognized the ordinary income with respect to their
issuance. A capital loss will result to the extent the amount realized upon such sale is less than such fair market value. (Please see Question T32 for the tax rates applicable to capital gain.) 

The gain or loss will be long-term if the shares are held for more than one year prior to the sale. The capital gain holding period for vested shares
will start on the date the shares are issued. The capital gain holding period for unvested shares issued under the Plan will start either (1) at the time the Company’s repurchase rights or other substantial risk of forfeiture lapse, if no
Section 83(b) election is filed at the time of issuance, or (2) at the time of issuance if you file the Section 83(b) election within thirty days after the issue date. 
 T24. What are the federal tax consequences to the Company? 
 The Company will be entitled
to an income tax deduction equal to the amount of ordinary income that you recognize in connection with the acquisition of common stock under the Plan. The deduction will normally be allowed for the taxable year in which such issuance occurs.
However, in the absence of your Section 83(b) election, the deduction for share issuances subject to the Company’s repurchase right or other substantial risk of forfeiture will not be allowed until the taxable year of the Company which
includes the last day of the calendar year in which you recognize ordinary income with respect to the issued shares. 

RESTRICTED STOCK UNITS AND PERFORMANCE AWARDS 
 T25. Will my receipt of my restricted stock units or performance awards result in federal income tax liability to me? 
 No. 

  
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 T26. Will the vesting of my restricted stock units or performance awards be a taxable event for U.S.
federal income tax purposes? 
 No. You will not recognize any taxable income for federal income tax purposes when your restricted stock
units or performance awards vest. 
 T27. Will the subsequent payout of my vested performance awards payable in cash, and the subsequent
issuance of shares of common stock under my vested restricted stock units or performance awards payable in shares, be a taxable event for federal income tax purposes? 
 Yes. You will recognize ordinary income for U.S. federal income tax purposes when you are paid in cash for any vested performance awards that are payable in cash, and when the shares of common stock under
your vested restricted stock units or performance awards payable in shares are actually issued to you, and the Company must withhold the requisite income taxes applicable to that income. 
 For restricted stock units or performance awards payable in shares, the amount of your taxable income will be equal to the selling price per share of common stock at the close of regular hours trading on
the issue date times the number of shares issued to you on that date. Unless the Company collects from you the income taxes required to be withheld with respect to the shares to be issued to you, none of those shares will actually be issued.

 T28. Will the vesting of my restricted stock units or performance awards be a taxable event for Social Security and Medicare tax purposes?

 As your restricted stock units or performance awards vest, you will become immediately liable for the payment of the employee share of
the FICA (Social Security and Medicare) taxes applicable to those awards. Accordingly, the Company must collect those taxes at the time of vesting, even though the cash will not be payable or shares issuable to you at that time. The FICA taxes will
be based on the selling price per share of common stock at the close of regular hours trading on the vesting date of the shares. The Company must also collect the employee portion of the FICA taxes with respect to any phantom dividends at the time
those phantom dividends vest hereunder. 
 Unless you deliver a separate check payable to the Company in the amount of the FICA taxes required
to be withheld from you, the Company will withhold those taxes from your wages. However, if you are at the time an executive officer of the Company, then such withholding taxes must be collected from you through delivery of your separate check not
later than the vesting date. 
 For the 2011 taxable year, Social Security taxes at the rate of 4.2% are imposed on the first $106,800 of your
taxable wages for the year. The Social Security taxable wage base usually increases from year to year. Your Medicare tax rate is 1.45% and is imposed on all of your taxable wages for the year. 

  
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 T29. How can the Company collect the withholding taxes with respect to the issuance of shares under my
vested restricted stock units or performance awards payable in shares? 
 Until such time as the Company provides you with notice to the
contrary, the Company will collect the federal, state and local income taxes required to be withheld with respect to the issuance of your vested shares through an automatic share withholding procedure pursuant to which the Company will withhold, at
the time of such issuance, a portion of the shares with a fair market value (based on the selling price per share of common stock at the close of regular hours trading on the issue date) equal to the amount of those taxes (the “Share
Withholding Method”). The dollar value of any shares so withheld will not exceed the amount necessary to satisfy the minimum statutory withholding rates for federal and state income tax purposes which are applicable to supplemental taxable
income. 
 Should any shares be distributed at a time when the Share Withholding Method is not available, then the federal, state and local
income taxes required to be withheld with respect to those shares will be collected from you through either of the following alternatives: 
 -
the delivery of your separate check payable to the Company or, 
 - the use of the proceeds from a next-day sale of the shares, provided and
only if (i) such a sale is permissible under the Company’s trading policies governing the sale of common stock, (ii) you make 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. 
 T30. Will I recognize additional income when I sell shares issued in satisfaction of my restricted stock units or performance awards payable in shares? 

Yes. You will recognize a capital gain for U.S. federal income tax purposes to the extent the amount realized upon the sale of the shares exceeds their
fair market value at the time you recognized ordinary income with respect to their issuance. A capital loss will result to the extent the amount realized upon such sale is less than such fair market value. (Please see Question T32 for the tax rates
applicable to capital gain.) 
 The gain or loss will be long-term if the shares are held for more than one (1) year prior to the sale. The
capital gain holding period for the shares will be measured from the date of their issuance. 
 T31. What are the federal tax consequences to
the Company? 
 The Company will be entitled to an income tax deduction equal to the amount of ordinary income you recognize in connection
with the payment of cash or issuance of the shares under your vested restricted stock units or performance awards. The deduction will normally be allowed for the taxable year in which such payment or issuance occurs. 

FEDERAL TAX RATES 

T32. What are the applicable federal tax rates? 
 Regular Tax Rates. The maximum federal tax rate on ordinary income in excess of $379,150 ($189,575 for a married taxpayer filing a separate return) is 35% for the 2011 calendar year. The applicable
$379,150 or $189,575 threshold is subject to cost-of-living adjustments in taxable years beginning after December 31, 2011. 

  
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 Capital Gain Tax Rates. Short-term capital gains are subject to the same tax rates as ordinary
income. Long-term capital gains recognized in calendar year 2011 or in any subsequent taxable year prior to the first taxable year beginning after December 31, 2011 will be subject to a maximum federal tax rate of 15% (or 0% for taxpayers whose
tax rate on ordinary income for the year is at the 10% or 15% level). 
 Long-term capital gains recognized in taxable years beginning after
December 31, 2012 will be subject to a maximum federal tax rate of 20%. 
 ALTERNATIVE MINIMUM TAX 

T33. What is the alternative minimum tax? 
 The alternative minimum tax is an alternative method of calculating the income tax you must pay each year in order to assure that a minimum amount of tax is paid for the year. The first $175,000 ($87,500
for a married taxpayer filing a separate return) of your alternative minimum taxable income for the year over the allowable exemption amount is subject to alternative minimum taxation at the rate of 26%. The balance of your alternative minimum
taxable income is subject to alternative minimum taxation at the rate of 28%. However, the portion of your alternative minimum taxable income attributable to (i) any capital gain recognized upon the sale or disposition of capital assets held
for more than one (1) year or (ii) certain qualified dividend income will be subject to a reduced alternative minimum tax rate of 15% (5% for individuals whose tax rate on ordinary income for the year is at the 10% or 15% level). The
alternative minimum tax will, however, be payable only to the extent that it exceeds your regular federal income tax for the year (computed without regard to certain credits and special taxes). 

T34. What is the allowable exemption amount? 
 The allowable exemption amount for the 2011 taxable year is $74,450 for a married taxpayer filing a joint return, $48,450 for an unmarried taxpayer and $37,225 for a married taxpayer filing a separate
return. The allowable exemption amount is, however, to be reduced by $0.25 for each $1.00 by which the individual’s alternative minimum taxable income for the year exceeds $150,000 for a married taxpayer filing a joint return, $112,500 for an
unmarried taxpayer, and $75,000 for a married taxpayer filing a separate return. 
 T35. How is the alternative minimum taxable income
calculated? 
 Your alternative minimum taxable income is based upon your regular taxable income for the year, adjusted to (i) include
certain additional items of income and tax preference and (ii) disallow or limit certain deductions otherwise allowable for regular tax purposes. 
 T36. Is the spread on an incentive stock option at the time of exercise normally includible in alternative minimum taxable income? 
 Yes. The spread on the shares purchased under an incentive stock option (the excess of the fair market value of the purchased shares at the time of exercise over the aggregate exercise price paid for
those shares) is normally included in the optionee’s alternative minimum taxable income at the time of exercise. 
 However, if the
purchased shares are sold in the same taxable year in which they are acquired, and such sale is to an unrelated party in which a loss (if otherwise incurred) would be recognized for tax purposes, then the amount includible in your alternative
minimum taxable income will in no event exceed the amount realized upon such sale less the option exercise price paid for those shares. 

  
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 T37. How will the payment of alternative minimum taxes in one year affect the calculation of my tax
liability in a later year? 
 If alternative minimum taxes are paid for one or more taxable years, a portion of those taxes (subject to
certain adjustments and reductions) will be applied as a partial credit against your regular tax liability (but not alternative minimum tax liability) for subsequent taxable years. Upon the sale or other disposition of the purchased shares, whether
in the year of exercise or in any subsequent taxable year, your basis for computing the gain for purposes of alternative minimum taxable income (but not regular taxable income) will include the amount of the option spread previously included in your
alternative minimum taxable income. 
 ADDITIONAL INFORMATION 
 The following documents filed by Koppers Holdings with the SEC (File No. 001-32737) are incorporated by reference in the prospectus: 

 

	 	(1)	Koppers Holdings’ latest Annual Report on Form 10-K filed pursuant to Section 13 or 15(d) of the Exchange Act; 

 

	 	(2)	All other reports filed by Koppers Holdings pursuant to Section 13(a) or 15(d) of the Exchange Act since the end of the fiscal year covered by the Annual Report on
Form 10-K referred to above; and 

  

	 	(3)	The description of Koppers Holdings’ common stock contained in the Registration Statement on Form 8-A, filed on January 27, 2006, including any amendment or
report filed for the purpose of updating such description. 

 All documents filed by Koppers Holdings pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Exchange Act subsequent to the filing of the Annual Report on Form 10-K referred to in paragraph (1) above and prior to the termination of the offering of common stock under the Plan shall be deemed to be incorporated
by reference in the prospectus and to be a part thereof from the date of filing of such documents, except that the information included in any document in response to paragraphs (i), (k) or (l) of Item 402 of SEC Regulation S-K is not
incorporated by reference. 
 Upon written or oral request, Koppers Holdings will furnish without charge to any holder of an outstanding award
under the Plan a copy of any or all of the information incorporated by reference in the prospectus (not including exhibits to documents incorporated by reference unless the exhibits are specifically incorporated by reference into the information
included in such documents). The documents incorporated by reference are also available electronically at the SEC’s Internet site at http://www.sec.gov. 
 A copy of Koppers Holdings’ most recent annual report to shareholders will be delivered with this document to any holder of an outstanding award under the Plan who has not already received the annual
report. Upon written or oral request, Koppers Holdings will furnish an additional copy of the annual report without charge to any such holder who received the annual report in advance of this document. Holders of outstanding awards who do not
otherwise receive this material as shareholders will receive copies of all reports, proxy statements and other communications distributed to Koppers Holdings’ shareholders generally, at the time such material is sent to shareholders.

  
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 This document may be updated in the future by furnishing to holders of outstanding awards under the Plans an
appendix, supplement, memorandum or replacement page containing updated information. New prospectuses will not be delivered except upon request. Accordingly, this document, together with any updating information that is distributed from time to
time, should be retained for future use. A copy of this document and any updating information will be furnished without charge to any such holder upon written or oral request. 
 Requests for documents referred to in the three preceding paragraphs should be directed to Koppers Holdings, 436 Seventh Avenue, Pittsburgh, PA 15219, Attention: Secretary (telephone: 412-227-2001).

  
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