Document:

Exhibit 10.4

 Exhibit 10.4 
 DELTEK SYSTEMS, INC. 
 EMPLOYEE STOCK PURCHASE PLAN 
 ARTICLE I 
 INTRODUCTION

 1.1 Purpose. The Deltek Systems, Inc. Employee Stock Purchase Plan is intended to provide a method whereby Eligible Employees
of Deltek Systems, Inc. and its Designated Subsidiaries will have an opportunity to purchase shares of Common Stock through accumulated payroll deductions and contributions. 
 1.2 Qualification. Subject to Article XI, it is the intention of the Company that the Plan will qualify as an “employee stock purchase
plan” under Section 423 or any successor provision of the Code and the related Treasury Regulations thereunder. The provisions of the Plan shall be construed so as to extend or limit the operation of, and participation in, the Plan as
necessary to conform to the requirements of Section 423 of the Code or applicable Treasury Regulations. 
 ARTICLE II 

DEFINITIONS 
 Capitalized terms used
in the Plan shall have the following meanings: 
 2.1 “Board” shall mean the Board of Directors of the Company. 

2.2 “Change in Capitalization” means any increase or reduction in the number of shares of Common Stock, or any change (including, but
not limited to, in the case of a spin-off, dividend or other distribution in respect of shares of Common Stock, a change in value) in shares of Common Stock or exchange of shares of Common Stock for a different number or kind of shares or other
securities of the Company or another corporation, by reason of a reclassification, recapitalization, merger, consolidation, reorganization, spin-off, split-up, issuance of warrants or rights or debentures, stock dividend, stock split or reverse
stock split, cash dividend, property dividend, combination or exchange of shares, repurchase of shares, change in corporate structure or other, similar transaction or event. 
 2.3 “Code” shall mean the Internal Revenue Code of 1986, as amended. 
 2.4 “Committee” shall mean the Compensation Committee of the Board, or a subcommittee thereof; provided, that if there is no
Compensation Committee of the Board, or if the Board determines that the Compensation Committee shall not be the Committee, then the Committee shall be the Board or such Directors as are appointed to the Committee by the Board. 
 2.5 “Common Stock” shall mean the common stock, par value $0.001 per share, of the Company. 

 2.6 “Company” shall mean Deltek Systems, Inc., a Virginia corporation, and shall include
any successor thereto by merger, consolidation, acquisition of substantially all the assets thereof, or otherwise, including Deltek, Inc., a Delaware corporation. 
 2.7 “Compensation” shall mean the total of all amounts paid to a Participant by the Company or an applicable Designated Subsidiary for personal services (i) for Participants who receive a Federal
Income Tax Withholding Statement (Form W-2), as reported on such Statement, and (ii) for Participants who do not receive a Federal Income Tax Withholding Statement (Form W-2), as determined by the Committee (and, in the case of each of
(i) and (ii), including fringe benefits, overtime and bonuses); provided, however, that the Committee may, in its discretion, use any definition of “Compensation” so long as such definition and its application satisfies
Section 423 of the Code. 
 2.8 “Contribution” shall mean the total of all payroll deductions from a Participant’s
Compensation during an Offering Period pursuant to Section 4.1 hereof and all personal contributions not from payroll deductions pursuant to Section 4.2 hereof; provided, that a Participant’s Contribution may be reduced in
whole or in part by the Board or the Committee, in its discretion, at any time during an Offering Period which is scheduled to end during the then-current calendar year to the extent necessary in order to comply with the provisions of
Section 423(b)(8) of the Code and Section 3.1(b) hereof; and, provided, further, that a Participant’s Contribution in any calendar year may not exceed the Participant’s Compensation during such calendar year. 

2.9 “Designated Subsidiary” shall mean any Subsidiary which has been designated by the Board from time to time in its sole discretion
as eligible to participate in the Plan. The Committee may designate, or terminate the designation of, a Subsidiary as a Designated Subsidiary without the approval of the stockholders of the Company. 
 2.10 “Director” shall mean a director of the Company. 
 2.11 “Eligible Employee” shall mean an Employee of the Company or a Designated Subsidiary: (i) who does not, immediately after the option is granted, own stock possessing five percent
(5%) or more of the total combined voting power or value of all classes of stock of the Company or a Subsidiary (as determined under Section 423(b)(3) of the Code); (ii) who is not an officer of the Company within the meaning of Rule
16a-1 promulgated under the Securities Exchange Act of 1934, as amended; (iii) whose customary employment is for more than twenty (20) hours per week; and (iv) whose customary employment is for more than five (5) months in any
calendar year. For purposes of clause (i), the rules of Section 424(d) of the Code with regard to the attribution of stock ownership shall apply in determining the stock ownership of an individual, and stock which an employee may purchase under
outstanding options shall be treated as stock owned by the employee. In addition, in the event local law prescribes that individuals employed for less than twenty (20) hours per week and/or less than five (5) months in any calendar year
must be offered participation in the Plan, such individuals will be considered Eligible Employees under the Plan. For purposes of the Plan, the employment relationship shall be treated as continuing intact while the individual is on sick leave or
other leave of absence approved by the Company or Designated Subsidiary and meeting the requirements of Treasury 

  

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Regulation Section 1.421-1(h)(2). Where the period of leave exceeds ninety (90) days and the individual’s right to reemployment is not
guaranteed either by statute or by contract, the employment relationship shall be deemed to have terminated on the ninety-first (91st) day of such leave. 
 2.12 “Employee” shall mean any individual who renders services to the Company or a Subsidiary in the status of an employee within the meaning of Section 3401(c) of the Code or as determined under
applicable local law. “Employee” shall not include any director of the Company or a Subsidiary who does not render services to the Company or a Subsidiary in the status of an employee within the meaning of Section 3401(c) of the Code
or under local law, as determined by the Committee. 
 2.13 “Exchange Act” shall mean the Securities Exchange Act of 1934,
as amended. 
 2.14 “Fair Market Value” on any date shall mean (i) the closing price at the end of normal market hours
of a share of Common Stock on such date as quoted on the National Association of Securities Dealers Automated Quotation System (the “Nasdaq”), (ii) if the Common Stock is not quoted on the Nasdaq but is listed for trading on
the New York Stock Exchange (the “NYSE”) or other national securities exchange, the closing price at the close of the primary trading session of a share of Common Stock on such date on the NYSE (or, if the Common Stock is not listed
for trading on the NYSE, on such other exchange) or (iii) if there is no such closing price for such date on the Nasdaq, the NYSE or other national exchange, the fair market value of a share of Common Stock as determined in good faith by the
Committee (and, if applicable, in accordance with Sections 409A and 422 of the Code). 
 2.15 “Offering Date” shall mean the
first business day of each Offering Period. 
 2.16 “Offering Price” shall have the meaning set forth in Section 5.2
hereof. 
 2.17 “Offering Period” shall mean each period of approximately six (6) months commencing on March 1st
and September 1st of each year and ending on August 31st and February 28th (or February 29th, if it is a leap year) of each year, respectively; provided, however, that the first Offering Period shall commence on the
date of the initial public offering of the Company and shall end on February 29, 2008. The Committee shall have the power to change the duration of Offering Periods, the Offering Dates and the Purchase Dates without stockholder approval if such
change is announced prior to the relevant Offering Period or prior to such other time period as specified by the Committee. 
 2.18
“Participant” shall mean any Eligible Employee who elects to participate in the Plan in accordance with the provisions of Section 3.2 hereof. 
 2.19 “Plan” shall mean the Deltek Systems, Inc. Employee Stock Purchase Plan, as amended from time to time. 
 2.20 “Plan Representative” shall mean the persons designated from time to time by the Committee to receive certain notices and take certain other administrative actions relating to the operation of,
and participation in, the Plan. 
  

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 2.21 “Purchase Date” shall mean the last business day of each Offering Period.

 2.22 “Securities Act” shall mean the Securities Act of 1933, as amended. 
 2.23 “Subsidiary” shall mean any entity, whether or not incorporated, in which the Company, directly or indirectly, owns 50% or more of
the total combined voting power of all classes of stock or other ownership interests. 
 ARTICLE III 
 ELIGIBILITY AND PARTICIPATION 
 3.1
Eligibility. 
 (a) Each Employee who is an Eligible Employee on an Offering Date shall be eligible to participate in the Offering
Period commencing on such Offering Date. Persons who are not Eligible Employees on an Offering Date shall not be eligible to participate in the Plan with respect to that Offering Period. 
 (b) Notwithstanding any provision of the Plan to the contrary, no Eligible Employee shall be granted an option to purchase shares of Common Stock under
the Plan which permits such Eligible Employee’s rights to purchase stock under all employee stock purchase plans of the Company or any Subsidiary subject to Section 423 of the Code to accrue at a rate which exceeds $25,000 of Fair Market
Value of the Common Stock (determined at the time such option is granted) for each calendar year in which such option is outstanding at any time. This limitation shall be applied in accordance with Section 423(b)(8) of the Code and the Treasury
Regulations thereunder. 
 3.2 Commencement of Participation. An Eligible Employee may become a Participant by completing an
authorization for payroll deductions or personal contribution not from Compensation on the form provided by the Company and filing the completed form with the Committee on or before the filing date set therefor by the Committee, which date shall be
prior to the Offering Date for the next following Offering Period. Payroll deductions for a Participant shall commence on the next following Offering Date after the Employee’s authorization for payroll deductions becomes effective and shall
continue until termination of the Plan or the Participant’s earlier termination of participation in the Plan. Each Participant shall be deemed to continue participation in the Plan until the earlier of (a) the termination of the Plan and
(b) such Eligible Employee’s termination of participation in the Plan pursuant to Article VII hereof. 
 ARTICLE IV

 PAYROLL DEDUCTIONS 
 4.1 Amount of Deduction. The form described in Section 3.2 will permit a Participant to elect percentage or fixed dollar amount payroll deductions for each pay period ending during an Offering Period; provided, that a
Participant’s payroll deductions may be reduced in whole or in part by the Board or the Committee, in its discretion, at any time during an Offering Period which is scheduled to end during the then-current calendar year to the extent necessary
in order to comply with the provisions of Section 423(b)(8) of the Code and Section 3.1(b) hereof. 
  

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 4.2 Personal Contribution not from Payroll Deductions. The form described in Section 3.2 will
also permit a Participant to make a personal contribution not from payroll deductions, in a form to be determined acceptable by the Board or Committee, in its discretion; provided that a Participant’s personal contribution not from payroll
deductions may be reduced in whole or in part by the Board or the Committee, in its discretion, at any time during an Offering Period which is scheduled to end during the then-current calendar year to the extent necessary in order to comply with the
provisions of Section 423(b)(8) of the Code and Section 3.1(b) hereof. 
 4.3 Participant’s Account. All payroll
deductions made for a Participant pursuant to Section 4.1 hereof and all personal contributions not from Compensation made pursuant to Section 4.2 shall be credited to a book-entry account established for such Participant under the Plan.

 4.4 Changes in Payroll Deductions. A Participant may reduce or increase future payroll deductions (within the limits described in
Section 4.1 hereof) by filing with the Committee a form provided by the Company for such purpose. The effective date of any increase or reduction in future payroll deductions will be the first day of the next Offering Period following the
Company’s receipt of the change form, if the Company shall have timely received such change form prior to the Offering Date of such Offering Period or as of such earlier date as the Committee may, in its discretion, determine or as shall be
applicable in connection with the cessation of the Participant’s participation in the Plan pursuant to Section 7.1 hereof. 
 4.5
Withholding. In connection with the exercise of an option (in whole or in part) or at the time of disposition of some or all of the Common Stock issued under the Plan, a Participant shall make adequate provision for any federal, state, local
or other tax withholding obligations, if any, which arise upon such exercise or disposition. At any time, the Company may, but shall not be obligated to, withhold from the Participant’s Compensation an amount necessary for the Company to
satisfy any applicable withholding obligations, including any withholding required to make available to the Company any tax deductions or benefits attributable to the early disposition of the Common Stock by the Employee. Furthermore, the Company
reserves the right to satisfy its applicable withholding obligations by any other means, as determined by the Committee. 
 ARTICLE V 

 GRANTING OF OPTION 
 5.1
Number of Option Shares. On each Offering Date, each Participant shall be deemed to have been granted an option to purchase a maximum number of shares of Common Stock the Fair Market Value of which is equal to (a) the Contribution (but
in any event not in excess of the limitations set by Section 3.1(b) hereof) divided by (b) the applicable Offering Price determined as provided in Section 5.2 hereof. 
  

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 5.2 Offering Price. The per share option price of shares of Common Stock purchased with
Contributions made during any Offering Period (the “Offering Price”) by a Participant shall not be less than the lesser of: 
 (a) eighty-five percent (85%) of the Fair Market Value of the Common Stock on the Offering Date of such Offering Period; or 
 (b) eighty-five percent (85%) of the Fair Market Value of the Common Stock on the Purchase Date of such Offering Period. 
 In
advance of the first Offering Period, the Committee shall determine the Offering Price applicable to such Offering Period. Such Offering Price shall remain in effect for subsequent Offering Periods until modified by the Committee; provided,
however, that any such modification shall apply prospectively to future Offering Periods only. 
 ARTICLE VI 
 EXERCISE AND OTHER TERMS OF OPTIONS 
 6.1 Automatic Exercise. Subject to Section 12.8 hereof, and unless a Participant withdraws from the Plan as provided in Section 7.1 hereof or otherwise becomes ineligible to participate in the Plan, each Participant’s
option for the purchase of shares of Common Stock with Contributions made during any Offering Period shall be exercised automatically on the applicable Purchase Date, and the maximum number of full shares subject to the option shall be purchased for
the Participant at the applicable Offering Price with the accumulated Contributions in such Participant’s account. No fractional shares shall be purchased; any Contributions accumulated in a Participant’s account which are not sufficient
to purchase a full share of Common Stock shall be retained in the Participant’s account for the next following Offering Period. 
 6.2
Non-Transferability of Options. Neither Contributions credited to any Participant’s account nor any option or rights with regard to the exercise of an option or the receipt of Common Stock under the Plan may be assigned, transferred,
pledged or otherwise disposed of in any way by the Participant other than by will or the laws of descent and distribution. Any such attempted assignment, transfer, pledge or other disposition shall be without effect, except that the Company may, in
its discretion, treat such act as an election to withdraw from participation in the Plan in accordance with Section 7.1 hereof. During a Participant’s lifetime, options held by a Participant shall be exercisable only by such Participant.

 6.3 Delivery of Stock. As promptly as practicable after each Purchase Date on which a purchase of shares occurs, the Company shall
arrange the delivery to each Participant of the shares of Common Stock purchased upon exercise of such Participant’s option. 
 6.4
Stock Transfer Restrictions. The Plan is intended to satisfy the requirements of Section 423 of the Code. Shares of Common Stock purchased upon exercise of options granted under the Plan may contain such restrictions, terms and
conditions as the Board or Committee may, in its discretion, determine, and the Board or Committee may, in its discretion, require that an appropriate legend be placed on the certificates evidencing such shares of Common Stock. 
  

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 ARTICLE VII 
 WITHDRAWAL 
 7.1 In General. Subject to Article XI, at any time prior to the last five
(5) days of an Offering Period, a Participant may withdraw all or a portion of the Contributions credited to such Participant’s account and not yet used to exercise such Participant’s option under the Plan by giving written notice to
the Committee in accordance with any procedures the Committee may set. Such withdrawn amount shall be paid to the Participant as soon as reasonably practicable after receipt of the notice of withdrawal, and the Participant’s option for the
Offering Period with respect to such amount shall be automatically terminated. No further contributions for the purchase of shares of Common Stock shall be made during such Offering Period, and such Participant will not participate in such Offering
Period with respect to the withdrawn amount. To the extent that a Participant withdraws all of such Participant’s Contributions with respect to an Offering Period, the Participant may continue participating in the Plan in successive Offering
Periods by providing written notice to the Committee in accordance with provisions of Section 3.2 hereof and in accordance with any procedures the Committee may set. 
 7.2 Effect on Subsequent Participation. A Participant’s withdrawal from any Offering Period shall not have any effect upon such Participant’s eligibility to participate in any subsequent Offering
Period or in any similar plan which may hereafter be adopted by the Company and for which such Participant is otherwise eligible. 
 7.3
Termination of Eligible Employee Status. Upon a Participant’s ceasing to be an Eligible Employee for any reason, including as a result of a termination of the Participant’s employment with the Company or any Designated Subsidiary
(as the case may be) for any reason (including retirement or death), such Participant shall be deemed to no longer be a Participant under the Plan, and the Contributions credited to such Participant’s account shall be refunded to him or her as
soon as reasonably practicable, or, in the case of his or her death, to the person or persons entitled thereto under Section 12.1 hereof. 
 ARTICLE VIII 
 INTEREST 
 8.1 Payment of Interest. Subject to Article XI, no interest will be paid or allowed on any Contributions made pursuant to the Plan or credited to the account of or distributed to any Participant. 
 ARTICLE IX 
 STOCK 
 9.1 Maximum Shares. Subject to the provisions of Sections 12.4 and 12.5 hereof, the maximum number of shares that may be issued under the Plan
shall be seven hundred and fifty thousand (750,000) shares of Common Stock, which shares may be authorized but unissued shares of Common Stock or treasury shares (including, without limitation, shares acquired by the Company on the open
market). 
  

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 9.2 Participant’s Interest in Option Stock. No Participant will have any interest in shares
of Common Stock covered by any option held by such Participant unless and until (a) such option has been exercised as provided in Section 6.1 hereof, (b) the Company shall have issued shares of Common Stock in respect of the
Participant and (c) the Participant’s name shall have been entered as a stockholder of record on the books of the Company. Thereupon, the Participant shall have full voting, dividend and other ownership rights with respect to such shares
of Common Stock. Shares of Common Stock purchased by a Participant under the Plan will be recorded in the books and records of the Company in the name of the Participant. 
 ARTICLE X 
 ADMINISTRATION 
 10.1 Committee. The Plan shall be administered by the Committee. A majority of the Committee shall constitute a quorum, and the action of a
majority of the members of the Committee present at any meeting at which a quorum is present, or acts unanimously approved in writing, shall be the acts of the Committee. The interpretation and construction by the Committee of any provision of the
Plan or any option granted hereunder shall be final and binding upon all parties. No member of the Committee shall be liable for any action or determination made in good faith with respect hereto or any option granted hereunder. 
 10.2 Authority of Committee. The Committee may establish any policies or procedures that in its discretion are necessary or appropriate for the
operation and administration of the Plan and may adopt rules for the administration of the Plan. It is intended that the Committee will engage the services of Plan Representatives and other plan administrators on such terms and conditions as the
Committee deems appropriate for the purposes of performing any of its responsibilities and obligations hereunder (including, without limitation, the distribution and collection of Participant notices and elections under the Plan and the
establishment of custodial accounts), other than (a) the amendment and termination of the Plan and (b) any action required to by taken by it pursuant to Section 16 of the Exchange Act. 
 ARTICLE XI 
 FOREIGN JURISDICTIONS

 11.1 The Committee may adopt rules or procedures relating to the operation and administration of the Plan to accommodate the specific
requirements of local laws and procedures. Without limiting the generality of the foregoing sentence, the Committee is specifically authorized to adopt rules and procedures regarding handling of payroll deductions, contributing to the Plan by means
other than payroll deductions, payment of interest on and Contributions, conversion of local currency, withholding procedures, withdrawing from the Plan, beneficiary designations, the use of funds and handling of stock certificates which may vary to
comply with or facilitate compliance with local law and procedures. 
  

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 11.2 The Committee may also adopt Plan supplements applicable to particular Designated Subsidiaries or
locations, which supplements may (as determined by the Committee) constitute provisions of this Plan applicable to such Designated Subsidiaries or locations or one or more sub-plans not intended to comply with Section 423 of the Code. The terms
and conditions of any such sub-plan shall supersede the provisions of this Plan to the extent determined by the Committee, with the exception of Section 9.1, but unless otherwise so superseded, the provisions of this Plan shall be deemed
incorporated into any such sub-plan. 
 ARTICLE XII 
 MISCELLANEOUS 
 12.1 Designation of Beneficiary. 
 (a) Subject to Article XI, a Participant may file with the Committee a written designation of a beneficiary who is to receive any shares of Common Stock
and cash, if any, from such Participant’s account under the Plan in the event of such Participant’s death subsequent to a Purchase Date but prior to delivery to such Participant of such shares and cash. In addition, subject to Article XI,
a Participant may file with the Committee a written designation of a beneficiary who is to receive any cash from such Participant’s account under the Plan in the event of such Participant’s death prior to a Purchase Date. 
 (b) Such designation of a beneficiary may be changed by the Participant at any time by written notice to the Committee. In the event of the death of a
Participant and in the absence of a beneficiary validly designated under the Plan who is living at the time of such Participant’s death, the Company shall deliver such shares of Common Stock and/or cash to the executor or administrator of the
estate of the Participant, or if no such executor or administrator has been appointed (to the knowledge of the Company), the Company may, in its discretion, deliver such shares of Common Stock and/or cash to the spouse or to any one or more
dependents or relatives of the Participant, or if no spouse, dependent or relative is known to the Company, then to such other person as the Company may designate, in each case without any further liability of the Company whatsoever under or
relating to the Plan. No beneficiary shall, prior to the death of the Participant by whom he or she has been designated, acquire any interest in the shares of Common Stock and/or cash credited to the Participant under the Plan. 
 12.2 Use of Funds. Subject to Article XI, all Contributions received or held by the Company under the Plan may be used by the Company for any
corporate purpose, and the Company shall not be obligated to segregate such Contributions. 
 12.3 Reports. Individual accounts shall
be maintained for each Participant in the Plan. Statements of account shall be given to participating Employees at least annually, which statements shall set forth the amounts of Contributions, the Offering Price, the number of shares of Common
Stock purchased and the remaining cash balance, if any. 
  

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 12.4 Adjustment Upon Changes in Capitalization, Dissolution, Liquidation or Change in Control.

 (a) Changes in Capitalization. 
 (i) In the event of a Change in Capitalization, the Committee shall make such adjustments, if any, as it determines are equitable and appropriate to (A) the maximum number and class of shares of Common Stock or other stock or
securities with respect to which options may be granted under the Plan, (B) the maximum number and class of shares of Common Stock or other stock or securities that may be issued upon exercise of options, (C) the maximum number and class
of shares of Common Stock or other stock or securities with respect to which options may be granted to any Eligible Employee in any calendar year and (D) the number and class of shares of Common Stock or other stock or securities which are
subject to outstanding options granted under the Plan and the Offering Price therefor, if applicable. 
 (ii) Any such adjustment in the
shares of Common Stock or other stock or securities subject to outstanding options (including any adjustments in the Offering Price) shall be made in such manner as not to constitute a modification as defined by Section 424(h)(3) of the Code
and only to the extent permitted by Sections 423 and 424 of the Code. 
 (iii) If, by reason of any such adjustment, a Participant shall be
entitled to, or a Participant shall be entitled to exercise an option with respect to, new, additional or different shares of stock or securities of the Company or any other corporation, such new, additional or different shares shall thereupon be
subject to all of the conditions and restrictions that were applicable to the shares of Common Stock subject to the option prior to such adjustment. 
 (b) Change in Control; Dissolution or Liquidation. 
 (i) In the event of a change in control or the
proposed dissolution or liquidation of the Company, the Committee shall have the option, in its discretion, to (A) accelerate the Purchase Date with respect to the Offering Period then in progress to the last payroll date immediately preceding
the change in control or proposed dissolution or liquidation and promptly refund (without interest) any cash balance remaining in a Participant’s account to such Participant or (B) terminate the Offering Period then in progress immediately
prior to the consummation of such change in control or proposed dissolution or liquidation and refund (without interest) the entire cash balance of a Participant’s account to such Participant as soon as reasonably practicable. 
 12.5 Amendment and Termination. The Board shall have complete power and authority to terminate or amend the Plan; provided, however,
that the Board shall not, without the approval of the stockholders of the Company, (a) increase the aggregate number of shares of Common Stock which may be issued under the Plan (except pursuant to Section 12.4 hereof) or (b) change
the class of Employees eligible to receive options under the Plan; and provided, further, however, that no termination, modification or amendment of the Plan may, without the consent of a Participant then having an option under
the Plan to purchase shares of Common 

  

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Stock, adversely affect the rights of such Participant under such option, except that the foregoing shall not prohibit the Company from terminating the Plan
at any time (including during an Offering Period) and either (i) applying the amounts theretofore withheld from a Participant to the purchase of shares of Common Stock as if the termination date of the Plan were a Purchase Date and promptly
refunding (without interest) any cash balance remaining in such Participant’s account to the Participant or (ii) refunding (without interest) the entire cash balance remaining in a Participant’s account to such Participant as soon as
reasonably practicable. 
 12.6 Non-Exclusivity of the Plan. The adoption of the Plan by the Board shall not be construed as amending,
modifying or rescinding any previously approved incentive arrangement or as creating any limitations on the power of the Board to adopt such other incentive arrangements as it may deem desirable, including, without limitation, the granting of stock
options other than under the Plan, and such arrangements may be either applicable generally or only in specific cases. 
 12.7 Limitation
of Liability. As illustrative of the limitations of liability of the Company, but not intended to be exhaustive thereof, nothing in the Plan shall be construed to: 
 (a) give any person any right to be granted an option except as specifically provided in the Plan; 
 (b)
give any person any rights whatsoever with respect to shares of Common Stock except as specifically provided in the Plan; 
 (c) limit in any
way the right of the Company to terminate the employment of any person at any time; or 
 (d) be evidence of any agreement or understanding,
expressed or implied, that the Company will employ any person at any particular rate of compensation or for any particular period of time. 
 12.8 Conditions to Issuance of Shares. 
 (a) Shares shall not be issued with respect to an option granted under the Plan
unless and until the exercise of such option and the issuance and delivery of such shares pursuant thereto shall comply with all applicable provisions of law, domestic or foreign, including, without limitation, the Securities Act, the Exchange Act,
the rules and regulations promulgated thereunder and the requirements of any stock exchange upon which the shares may then be listed, and shall be further subject to the approval of counsel for the Company with respect to such compliance.

 (b) As a condition to the exercise of an option, the Company may require the person exercising such option to represent and warrant at the
time of any such exercise that the shares are being purchased only for investment and without any present intention to sell or distribute such shares if, in the opinion of counsel for the Company, such a representation is required by any of the
aforementioned applicable provisions of law. 
  

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 12.9 Governing Law. Except as to matters of federal law, the Plan and the rights of all persons
claiming hereunder shall be construed and determined in accordance with the laws of the State of Delaware without giving effect to conflicts of laws principles thereof. 
 12.10 Effective Date. The effective date of the Plan shall be as determined by the Board, subject only to approval by the affirmative vote of the holders of a majority of the securities of the Company present,
or represented, and entitled to vote at a meeting of stockholders duly held in accordance with the applicable laws of the State of Delaware within twelve (12) months after the adoption of the Plan by the Board, and in any event after the
reincorporation of the Company under the laws of the State of Delaware. 
  

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 Exhibit 10.31 
 STOCK OPTION AGREEMENT (the “Agreement”), dated as of May 24, 2007 between Deltek, Inc., a Delaware corporation (together with its successors, the “Company”), and Holly Kortright
(the “Optionee”). 
 RECITALS 
 WHEREAS, on March 15, 2007 (the “Date of Grant”), the Compensation Committee of the Board of Directors of the Company granted the Optionee the right and option to purchase 50,000 shares of Common
Stock with a per share exercise price of $13.10 (the “Option”); and 
 WHEREAS, the Optionee and the Company now intend to
evidence the Option; 
 NOW, THEREFORE, in consideration of the mutual covenants contained herein and for other good and valuable
consideration, the receipt and sufficiency of which are acknowledged, the parties hereto agree as follows: 
 Section 1. Grant of Option.
This Agreement evidences the Optionee’s right and option to purchase 50,000 shares of Common Stock (subject to adjustment as provided in Section 7 of the Plan) on the terms and conditions set forth in this Agreement and in the Deltek, Inc.
2005 Stock Option Plan (the “Plan”), a copy of which is being delivered to the Optionee concurrently herewith and is made a part hereof as if fully set forth herein. Except as otherwise defined herein, capitalized terms used in this
Agreement shall have the same definitions as set forth in the Plan. The Option is not intended to qualify as an Incentive Stock Option within the meaning of Section 422 of the Code. 
 Section 2. Purchase Price. The price (the “Option Price”) at which the Optionee shall be entitled to purchase shares of Common Stock upon the exercise of this Option shall be $13.10
per share (subject to adjustment as provided in Section 7 of the Plan). 
 Section 3. Duration of Option. The Option shall be
exercisable to the extent and in the manner provided herein for a period of ten years after the Date of Grant; provided, however, that the Option may be earlier terminated as provided in Section 4, 6, 7, 8 or 9. 
 Section 4. Exercisability of Option. 
 4.1. General. Subject to the provisions of this Agreement and the Plan, the Option shall be exercisable in accordance with the following schedule: 
 (a) prior to March 15, 2008, the Option may not be exercised; 
 (b) on or after March 15, 2008 but before March 15, 2009, the Option may be exercised to acquire up to 25% of the aggregate
number of shares of Common Stock that may be purchased pursuant to the Option as set forth in Section 1, less any shares previously acquired pursuant to the Option; 

 (c) on or after March 15, 2009 but before March 15, 2010, the Option may be exercised to
acquire up to 50% of the aggregate number of shares of Common Stock that may be purchased pursuant to the Option as set forth in Section 1, less any shares previously acquired pursuant to the Option; 
 (d) on or after March 15, 2010 but before March 15, 2011, the Option may be exercised to acquire up to 75% of the aggregate number of shares of
Common Stock that may be purchased pursuant to the Option as set forth in Section 1, less any shares previously acquired pursuant to the Option; and 
 (e) on or after March 15, 2011, the Option may be exercised to acquire up to 100% of the aggregate number of shares of Common Stock that may be purchased pursuant to the Option as set forth in Section 1,
less any shares previously acquired pursuant to the Option; 
 provided, however, that notwithstanding the foregoing schedule as to
exercisability, in the event of a Change in Control occurring while the Optionee is employed by the Company, the Option shall become exercisable in full to the extent then unexercisable if your employment is terminated on the date of or within 18
months following a Change in Control either by the Company or its successor without Cause or by you for Good Reason. For purposes of the foregoing proviso, the terms “Cause,” “Change in Control” and “Good
Reason” shall have the meanings set forth in the employment letter, dated as of May 2, 2007, between the Company and the Optionee (the “Employment Letter”). 
 4.2. Death; Disability. 
 (a) Subject
to the provisions of this Agreement and the Plan, and notwithstanding any other provision of Section 4.1, the Option may be exercised to acquire up to 100% of the aggregate number of shares of Common Stock that may be purchased pursuant to the
Option as set forth in Section 1, less any shares previously acquired pursuant to the Option, if the Optionee (i) dies or (ii) ceases to be a full-time employee due to the Disability of the Optionee. 
 (b) “Disability” is defined as a physical or mental condition as a result of which the Optionee is unable to perform the primary duties,
responsibilities and functions of their position for a period of 90 days. 
 4.3. Sales or Other Events. The Company
shall give the Optionee at least five business days’ notice (or, if not practicable, such shorter notice as may be practicable) (the “Sale Notice”) prior to the anticipated date of the consummation of a sale by the NMP Entities
of any of their shares of Common Stock to a Third Party (an “NMP Sale”). The Optionee shall be permitted to exercise the Option to the extent provided in this Section 4.3 in order to participate in the NMP Sale;
provided, that, in the event of an NMP Sale in which the Optionee would be required to participate pursuant to Section 3.5 of the Optionee Shareholders’ Agreement were the Optionee then a party to such agreement, the Company may
require the Optionee to exercise the 

  

 - 2 - 

 
Option to the extent necessary to enable the Optionee to participate therein or forfeit the Option (or portion thereof, as applicable). Notwithstanding
anything in Section 4.1 to the contrary, in connection with an NMP Sale, the Option may be exercised to the extent of the excess, if any, of (a) the number of shares with respect to which the Optionee would be entitled to, or is being
required to, participate in an NMP Sale, and will so participate, over (b) the number of shares previously issued to the Optionee upon exercise of the Option and not previously disposed of. Unless the Company elects to allow an earlier exercise
of the Option, the exercise of an Option in connection with an NMP Sale shall be made in accordance with Section 5 and shall be made concurrently with the consummation of the NMP Sale, and, in the event the NMP Sale is not consummated, any
notice of exercise submitted in connection with the NMP Sale shall be of no force or effect and the Option shall be exercisable thereafter to the extent it would have been exercisable if no Sale Notice or notice of exercise had been given. In lieu
of permitting the Optionee to participate in a Public Offering of all or a portion of the shares of Common Stock owned by the NMP Entities (a “Secondary Public Offering”), the Company, at its option, may instead cause the Option and
the underlying shares to be registered under applicable securities laws, or make other arrangements consistent with such laws, so as to permit the Optionee to sell for a period of time after the Secondary Public Offering the same number of shares
that the Optionee would have been able to sell in the Secondary Public Offering but for this sentence. 
 4.4.
Termination of Option. Subject to the provisions of Section 9, the Option shall terminate simultaneously with the consummation of a Total Sale to the extent that the Option has not theretofore been exercised. 
 4.5. Exercises Under Multiple Option Agreements. Notwithstanding anything herein to the contrary, if, in connection with an NMP Sale, the Optionee
shall be entitled to acquire shares of Common Stock pursuant to Section 4.3 and 4.3 and pursuant to the analogous provisions of one or more other stock option agreements between the Optionee and the Company (any such agreement, including this
Agreement, an “Option Agreement”), then the Company shall have the right, at its option, to designate the Option Agreement or Option Agreements pursuant to which the Optionee may exercise options for purposes of the Optionee’s
participation in an NMP Sale, provided that in no event shall any such determination reduce the aggregate number of shares that the Optionee would otherwise be entitled to sell in connection with such NMP Sale. 
 Section 5. Manner of Exercise and Payment. 
 5.1. Notice of Exercise. Subject to the terms and conditions of this Agreement and the Plan, the Option may be exercised by delivery of written notice to the Company. Such notice shall state that the
Optionee is electing to exercise the Option, shall set forth the number of shares of Common Stock in respect of which the Option is being exercised and shall be signed by the Optionee or, where applicable, by the Optionee’s Legal
Representative. 
  

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 5.2. Deliveries. The notice of exercise described in Section 5.1 shall be accompanied by
(a) payment of the full purchase price for the shares in respect of which the Option is being exercised, together with any withholding taxes that may be due as a result of the exercise of the Option, such payment to be made by delivery to the
Company of a certified or bank check payable to the order of the Company or cash by wire transfer or other immediately available funds to an account designated by the Company, and (b) a fully executed Optionee Shareholders’ Agreement (a
copy of which, in the form to be executed by the Optionee (which may differ from optionee to optionee and from time to time), will be supplied to the Optionee upon request) and the undated stock power referred to in Section 6.14(a)(ii) of the
Optionee Shareholders’ Agreement. 
 5.3. Issuance of Shares. Upon receipt of notice of exercise, full payment for the
shares of Common Stock in respect of which the Option is being exercised and a fully executed Optionee Shareholders’ Agreement and stock power, and subject to Section 9 of the Plan, the Company shall take such action as may be necessary
under applicable law to effect the issuance to the Optionee of the number of shares of Common Stock as to which such exercise was effected. No fractional shares of Common Stock (or cash in lieu thereof) shall be issued upon exercise of an Option and
the number of shares of Common Stock that may be purchased upon exercise shall be rounded to the nearest whole number. 
 5.4.
Shareholder Rights. The Optionee shall not be deemed to be the holder of, or to have any of the rights of a holder with respect to, any shares of Common Stock subject to the Option until: (a) the Option shall have been exercised in
accordance with the terms of this Agreement and the Optionee shall have paid the full purchase price for the number of shares in respect of which the Option was exercised and any withholding taxes due, (b) the Optionee shall have delivered the
fully executed Optionee Shareholders’ Agreement and stock power to the Company, (c) the Company shall have issued the shares to the Optionee, and (d) the Optionee’s name shall have been entered as a shareholder of record on the
books of the Company. Upon the occurrence of all of the foregoing events, the Optionee shall have full ownership rights with respect to such shares, subject to the provisions of the Optionee Shareholders’ Agreement. 
 Section 6. Certain Restrictions. 
 6.1.
No Sale or Transfer. The Optionee shall not sell, transfer, assign, exchange, pledge, encumber or otherwise dispose of the Option or any portion thereof. 
 6.2. Employment Termination. If the Optionee shall no longer be employed on a full-time basis by the Company (“Terminated”
or a “Termination”), irrespective of whether the Optionee receives, in connection with the Termination, any severance or other payment from the Company under any employment agreement or otherwise, then (i) the Option, to the
extent it is not exercisable pursuant to Section 4.1 or 4.2 at the date of such Termination, shall terminate on, and shall be of no further force and effect from and after, the date of such Termination, and (ii) the Option, to the extent
it is exercisable pursuant to Section 4.1 or 4.2 at the date of such Termination (the “Exercisable Portion of the Option”), shall be exercisable by the Optionee during the Post-Termination Exercise Period (as defined below),
but in no event after the expiration of the term of the Option, and, until exercised, the Exercisable Portion of the Option 

  

 - 4 - 

 
shall continue to be subject to the terms of this Agreement, including Section 4.3. If the Optionee does not exercise any portion of the Exercisable
Portion of the Option within the Post-Termination Exercise Period, such portion shall terminate and shall be of no further force and effect following the close of business on the last day of the Post-Termination Exercise Period. 
 “Post-Termination Exercise Period” shall mean the period commencing on the date of the Optionee’s Termination and ending at the
close of business on the 180th day after the date of the Optionee’s Termination. Notwithstanding anything in this Agreement or the Plan to the contrary, and in addition to the rights of the Company set forth in Section 7.2, the Option,
whether exercisable or unexercisable, shall immediately terminate upon a Termination by the Company for Cause. 
 Section 7.
Prohibited Activities. 
 7.1. Prohibition Against Certain Activities. The Optionee agrees that the
Optionee will not at any time (a) disclose or furnish to any other Person or use for the Optionee’s own or any other Person’s account any Confidential or Proprietary Information (other than in the course of the Optionee’s
employment with the Company) except for Permitted Disclosures (a “Prohibited Disclosure”), (b) directly or indirectly solicit for employment, including without limitation, recommending to any subsequent employer the
solicitation for employment of, any employee of the Company or any Affiliate thereof (provided, that this clause (b) shall expire on the second anniversary of the date of the Optionee’s Termination) (a “Prohibited
Solicitation”) and (c) commit a breach of the provisions of Section 6.1 (a “Prohibited Transfer”). 
 “Confidential or Proprietary Information” shall mean any non-public information about the Company or any Affiliate thereof which was acquired by the Optionee during the Optionee’s employment with the Company or any
Affiliate thereof and which has or is reasonably likely to have competitive value to the Company or any Affiliate thereof or to a Competitor, but excluding information that is or becomes generally available to the public other than as a result of a
breach of this Agreement by the Optionee. 
 “Permitted Disclosure” means the disclosure of Confidential or Proprietary
Information (i) made with the prior written consent of the Company, (ii) required to be disclosed by law or legal process or (iii) if the Optionee is a party to the Recapitalization Agreement, dated as of December 23, 2004, to
which (among others) the Company and the NMP Entities are parties, as may reasonably be necessary in connection with the performance of any indemnification obligations thereunder. 
 7.2. Right to Terminate Option. The Optionee understands and agrees that the Company is granting to the Optionee the Option to reward the Optionee
for the Optionee’s future efforts and loyalty to the Company and its Affiliates by giving the Optionee the opportunity to participate in the potential future appreciation of the Company. Accordingly, if, while any portion of the Option is
outstanding, (a) the Optionee engages in any Prohibited Disclosure or breaches or violates the Optionee’s obligations relating to the non-disclosure or non-use of 

  

 - 5 - 

 
confidential or proprietary information under any Employee Agreement to which the Optionee is a party, or (b) the Optionee engages in any Prohibited
Solicitation or breaches or violates any non-solicitation obligations under any Employee Agreement to which the Optionee is a party, or (c) the Optionee engages in any Prohibited Transfer, or (d) the Optionee engages in any Competitive
Activity or breaches or violates any non-competition obligations under any Employee Agreement to which the Optionee is a party, or (e) the Optionee is convicted of a felony against the Company or any of its Affiliates, then, in addition to any
other rights and remedies available to the Company, the Company shall be entitled, at its option, exercisable by written notice, to terminate the Option (including the Exercisable Portion of the Option), or any unexercised portion thereof, which
shall then be of no further force and effect. 
 “Competitive Activity” shall mean, directly or indirectly, (i) owning,
managing, operating, joining, controlling, being employed by, or participating in the ownership, management, operation or control of, or being connected in any manner with, including, without limitation, holding any position as a shareholder,
director, officer, consultant, independent contractor, employee or partner of, spokesman for, or investor in, any Competitor, or (ii) acting as a Competitor in an individual capacity; provided, that, in no event (i) shall ownership
by the Optionee of five percent (5%) or less of the outstanding securities of any class of any issuer whose securities are registered under the Securities Exchange Act of 1934, as amended, standing alone, be considered Competitive Activity, so
long as the Optionee does not have, or exercise, any rights to manage or operate the business of such issuer other than rights as a shareholder thereof, (ii) shall being employed by a Competitor, standing alone, be considered Competitive
Activity, so long as (A) the Competitor has more than one discrete and readily distinguishable part of its business, (B) the Optionee’s duties are not at or involving the part of the Competitor’s business that constitutes a
Competing Business, including, without limitation, serving in a capacity where any Person involved in the part of the Competitor’s business that constitutes a Competing Business reports to the Optionee and (C) the Optionee notifies the
Company of such employment prior to commencement of his or her employment with such Competitor, or (iii) shall being employed by a licensee of any Company Product and providing Competing Services to such licensee, standing alone, be considered
Competitive Activity. 
 “Competitor” shall mean any Person that is engaged in (or intends or proposes to engage in, or has
been organized for the purpose of engaging in) a Competing Business in the Company’s Market Area. 
 “Company’s Market
Area” shall mean (x) the United States (including each state and the District of Columbia), and (y) each country or territory other than the United States which accounted for at least two and one-half percent (2-1/2%) of software
license revenue by the Company and its subsidiaries during the 12 months immediately prior to the date the Optionee’s employment Terminates as reported on the Company’s financial statements. 
  

 - 6 - 

 “Competing Business” shall mean the business of (a) developing, implementing,
marketing and/or selling any Company Products or Competing Products or (b) developing, providing, performing, marketing or selling any Competing Services. 
 “Company Product” shall mean any project-based business management and/or sales management software and/or other product that, as of the date the Optionee’s employment Terminates, the Company or
any of its Affiliates is developing, implementing, marketing and/or selling. 
 “Competing Product” shall mean any product
that competes with any Company Product. 
 “Competing Service” shall mean implementation, consulting, support, maintenance,
development and/or training services relating to or in connection with the use of any Company Products or Competing Products. 
 “Employee Agreement” shall mean any agreement between the Company and the Optionee that contains non-competition, non-solicitation or confidentiality restrictions on the Optionee. 
 Section 8. Effect of Certain Transactions. Subject to Section 9, in the event of (a) the liquidation or dissolution of the Company or (b) a
merger or consolidation of the Company (a “Transaction”), the Option shall continue in effect in accordance with its terms, except that following the Transaction either (i) each outstanding Option shall be treated as provided
for in the plan of liquidation or dissolution adopted, or the agreement entered into, in connection with the Transaction or (ii) if not so provided in such plan or agreement, the Optionee shall be entitled to receive in respect of each share of
Common Stock subject to the Option, upon exercise of the Option, the same number and kind of stock, securities, cash, property or other consideration that each holder of a share of Common Stock was entitled to receive in the Transaction in respect
of a share of Common Stock; provided, however, that such stock, securities, cash, property, or other consideration shall remain subject to all of the conditions, restrictions and performance criteria which were applicable to the Option
prior to such Transaction. 
 Section 9. Continuation of Plan upon Total Sale. 
 (a) Upon the effective date of any Total Sale, as defined in the Plan, any unexercised portion of the Option shall terminate unless provision shall be
made in writing in connection with such Total Sale for the continuance of the Plan and such unexercised portion of the Option or for the assumption of such unexercised portion of the Option by a successor to the Company or for the substitution for
such unexercised portion of the Option of new options covering shares or other securities or other equity interests of such successor with appropriate adjustments as to number and kind of shares or other securities or other equity interests, option
prices and other terms of such new options. In the event that provision in writing is made as aforesaid in connection with a Total Sale, the unexercised portion of the Option or the new options substituted therefor shall continue in the manner and
under the terms provided in the Plan and this Agreement and in such writing. 
  

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 (b) “Total Sale” shall have the definition specified in Section 2.20 of the Plan.

 Section 10. Miscellaneous. 
 10.1. Acknowledgment. The Optionee hereby acknowledges receipt of a copy of the Plan and agrees to be bound by all the terms and provisions thereof as the same may be amended from time to time. The Optionee hereby acknowledges that
the Optionee has reviewed the Plan and this Agreement and understands the Optionee’s rights and obligations thereunder and hereunder. The Optionee also acknowledges that the Optionee has been provided with such information concerning the
Company, the Plan and this Agreement as the Optionee and the Optionee’s advisors have requested. 
 10.2.
Resolution of Disputes. Any dispute or disagreement which may arise under, or as a result of, or which may in any way relate to, the interpretation, construction or application of this Agreement shall be determined by the Committee,
in good faith, whose determination shall be final, binding and conclusive for all purposes. 
 10.3. Governing Law; Venue; Compliance
with Law; Service of Process; Waiver of Jury Trials. 
 (a) Governing Law. This Agreement shall be construed and enforced in
accordance with, and the rights and obligations of the parties hereto shall be governed by, the laws of the State of New York, without giving effect to the conflicts of law principles thereof. 
 (b) Compliance with Law. Notwithstanding anything herein to the contrary, the Company shall not be required to issue shares pursuant to the
exercise of any Option granted under this Agreement, the Grant Notice and the Plan unless such exercise and issuance comply with all applicable laws, including, without limitation, all applicable federal and state securities laws. 
 (c) Venue and Service of Process. By execution and delivery of this Agreement, each of the parties hereto hereby irrevocably and unconditionally
(i) consents to submit to the exclusive jurisdiction of the federal and state courts of the State of New York located in New York County (collectively, the “Selected Courts”) for any action or proceeding arising out of or
relating to this Agreement and the transactions contemplated hereby, and agrees not to commence any action or proceeding relating thereto except in the Selected Courts, provided, that, a party may commence any action or proceeding in a court
other than a Selected Court solely for the purpose of enforcing an order or judgment issued by one of the Selected Courts; (ii) consents to service of any process, summons, notice or document in any action or proceeding by registered
first-class mail, postage prepaid, return receipt requested or by nationally recognized courier guaranteeing overnight delivery in accordance with Section 10.6 

  

 - 8 - 

 
and agrees that such service of process shall be effective service of process for any action or proceeding brought against it in any such court,
provided, that, nothing herein shall affect the right of any party hereto to serve process in any other manner permitted by law; (iii) waives any objection to the laying of venue of any action or proceeding arising out of this Agreement
or the transactions contemplated hereby in the Selected Courts; and (iv) waives and agrees not to plead or claim in any court that any such action or proceeding brought in any such Selected Court has been brought in an inconvenient forum.

 (d) Waiver of Jury Trial. EACH OF THE PARTIES HEREBY IRREVOCABLY, TO THE EXTENT NOT PROHIBITED BY APPLICABLE LAW THAT CANNOT BE
WAIVED, WAIVES, AND COVENANTS THAT IT WILL NOT ASSERT (WHETHER AS PLAINTIFF, DEFENDANT OR OTHERWISE), ANY RIGHT TO TRIAL BY JURY IN ANY ACTION OR PROCEEDING IN WHOLE OR IN PART ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS
CONTEMPLATED HEREBY, WHETHER NOW EXISTING OR HEREAFTER ARISING, AND WHETHER SOUNDING IN CONTRACT, TORT OR OTHERWISE, AND AGREES THAT ANY OF THEM MAY FILE A COPY OF THIS PARAGRAPH WITH ANY COURT AS WRITTEN EVIDENCE OF THE KNOWING, VOLUNTARY AND
BARGAINED-FOR AGREEMENT AMONG THE PARTIES IRREVOCABLY TO WAIVE ITS RIGHT TO TRIAL BY JURY IN ANY SUCH ACTION OR PROCEEDING. SUCH ACTION OR PROCEEDING SHALL INSTEAD BE TRIED IN A SELECTED COURT BY A JUDGE SITTING WITHOUT A JURY. 
 10.4. Specific Performance. The parties hereto acknowledge that there will be no adequate remedy at law for a violation of any of the provisions
of this Agreement and that, in addition to any other remedies which may be available, all of the provisions of this Agreement shall be specifically enforceable in accordance with their respective terms. 
 10.5. Severability. Whenever possible, each provision or portion of any provision of this Agreement will be interpreted in such manner as to be
effective and valid under applicable law but the invalidity or unenforceability of any provision or portion of any provision of this Agreement in any jurisdiction shall not affect the validity or enforceability of the remainder of this Agreement in
that jurisdiction or the validity or enforceability of this Agreement, including that provision or portion of any provision, in any other jurisdiction. In addition, should a court or arbitrator determine that any provision or portion of any
provision of this Agreement is not reasonable or valid, either in period of time, geographical area, or otherwise, the parties hereto agree that such provision should be interpreted and enforced to the maximum extent which such court or arbitrator
deems reasonable or valid. 
 10.6. Notice. Unless otherwise provided herein, all notices, requests and other communications provided
for under the terms of this Agreement shall be in writing. Any notice, request or other communication hereunder shall be sent by (i) personal delivery, (ii) facsimile during normal business hours, with confirmation of receipt, to the
number indicated, 

  

 - 9 - 

 
(iii) reputable commercial overnight delivery service courier or (iv) registered or certified mail, return receipt requested, postage prepaid, in
each case addressed to the intended recipient as set forth below: 
  

	 	(a)	If to the Company, to: 

 Deltek Systems, Inc. 

13880 Dulles Corner Lane 
 Herndon,
Virginia 20171 
 Attention: Chief Financial Officer and General Counsel 
 Facsimile: (703) 885-9838 
  

	 	(b)	With a copy to (which shall not constitute notice): 

 Fried, Frank, Harris, Shriver & Jacobson LLP 
 One New York Plaza 
 New York, New York 10004 
 Facsimile:
(212) 859-4000 
 Attention: Aviva F. Diamant, Esq. 
 (c) If to the Optionee, at the most recent address and facsimile number contained in the Company’s records, and if to the Legal Representative, to such Person at the address of which the Company is notified in
accordance with this Section 10.6. 
 All such notices, requests and other communications shall be deemed to have been given when received. Any party
may change its facsimile number or its address to which notices, requests and other communications hereunder are to be delivered by giving the other parties hereto notice in the manner then set forth. 
 10.7. Binding Effect; Assignment; Third-Party Beneficiaries. This Agreement shall be binding upon and inure to the benefit of and be enforceable
by the parties hereto and any of their respective successors, personal representatives and permitted assigns who agree in writing to be bound by the terms hereof. Neither this Agreement nor any of the rights, interests or obligations hereunder shall
be assigned by the Optionee without the prior written consent of the Company. In addition, each of the NMP Entities shall be a third party beneficiary of this Agreement and shall be entitled to enforce this Agreement. In connection with the transfer
of any securities of the Company held by an NMP Entity, each NMP Entity shall be entitled to assign its rights hereunder to an Affiliate of such NMP Entity or a partner of such NMP Entity or Affiliate and, subject to such NMP Entities’
compliance with Section 3.3 of the Optionee Shareholders’ Agreement, if applicable, to a Third Party. 
 10.8.
Amendments and Waivers. This Agreement and any of the provisions hereof may be amended, waived (either generally or in a particular instance and either retroactively or prospectively), modified or supplemented, in whole or in part,
only by written 

  

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agreement signed by the Company and the Optionee; provided, that, the observance of any provision of this Agreement may be waived in writing by the
party that will lose the benefit of such provision as a result of such waiver. The waiver by any party hereto of a breach of any provision of this Agreement shall not operate or be construed as a further or continuing waiver of such breach or as a
waiver of any other or subsequent breach, except as otherwise explicitly provided for in such waiver. Except as otherwise expressly provided herein, no failure on the part of any party to exercise, and no delay in exercising, any right, power or
remedy hereunder, or otherwise available in respect hereof at law or in equity, shall operate as a waiver thereof, nor shall any single or partial exercise of such right, power or remedy by such party preclude any other or further exercise thereof
or the exercise of any other right, power or remedy. 
 10.9. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original, but all such counterparts shall together constitute one and the same instrument. 
 10.10. Entire Agreement. This Agreement and the Plan and, upon execution thereof, the Optionee Shareholders’ Agreement, constitute the entire agreement, and supersede all prior agreements and understandings, oral and
written, between the parties hereto with respect to the Option granted hereby. 
 10.11. Withholding. The Company shall have the right
to deduct from any amount payable under this Agreement any taxes or other amounts required by applicable law to be withheld. The Optionee agrees to indemnify the Company against any federal, state and local withholding taxes for which the Company
may be liable in connection with the Optionee’s acquisition, ownership or disposition of any Common Stock. 
 10.12. No Right to
Continued Employment. This Agreement shall not confer upon the Optionee any right with respect to continuance of employment by the Company or any Affiliate thereof, nor shall it interfere in any way with the right of the Company or any Affiliate
thereof to terminate such Optionee’s employment at any time. 
 10.13. General Interpretive Principles. Whenever used in this
Agreement, except as otherwise expressly provided or unless the context otherwise requires, any noun or pronoun shall be deemed to include the plural as well as the singular and to cover all genders. The headings of the sections, paragraphs,
subparagraphs, clauses and subclauses of this Agreement are for convenience of reference only and shall not in any way affect the meaning or interpretation of any of the provisions hereof. Unless otherwise specified, the terms “hereof,”
“herein” and similar terms refer to this Agreement as a whole (including the exhibits, schedules and disclosure statements hereto), and references herein to Sections refer to Sections of this Agreement. Words of inclusion shall not be
construed as terms of limitation herein, so that references to “include,” “includes” and “including” shall not be limiting and shall be regarded as references to non-exclusive and non-characterizing illustrations.

  

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 IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first written above.

  

									
		 		 	DELTEK, INC.
				
	/s/ Holly C. Kortright	 		 	By:	 	/s/ Kevin Parker
	Holly Kortright	 		 		 	Kevin Parker
		 		 		 		 	President and Chief Executive Officer
				
	Date: June 16, 2007	 		 		 	Date: May 24, 2007

  

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