Document:

EX-10.18

 Exhibit 10.18 

EXECUTIVE EMPLOYMENT AGREEMENT 

This EXECUTIVE EMPLOYMENT AGREEMENT (the
“Agreement”) is entered into effective January 15, 2014 (the “Effective Date”), by and between Helen Thackray (“Executive”) and GLYCOMIMETICS, INC. (the
“Company”). 
 WHEREAS, Executive has been employed by the Company pursuant to an Employment Agreement dated
September 11, 2006 (“Prior Agreement”); 
 WHEREAS, the Company and Executive wish to supersede the Prior
Agreement with this Agreement; and 
 WHEREAS, the Company desires to continue to employ Executive to provide personal services to the
Company, and Executive wishes to continue to be employed by the Company and provide personal services to the Company in return for certain compensation and benefits. 

Accordingly, in consideration of the mutual promises and covenants contained herein, the parties agree to the following: 

1. EMPLOYMENT BY THE COMPANY. 

1.1 Term. The term of employment hereunder will be for the four year period commencing on the Effective Date and ending on the
fourth anniversary of the Effective Date, subject to termination prior thereto pursuant to Sections 5, 6, 7, 8 or 9 below. Unless the Company gives notice of its intent not to renew Executive’s employment
hereunder, or Executive gives written notice to the Company of her determination not to renew her service and employment hereunder, in any case at least one year prior to the fourth anniversary of the Effective Date, this Agreement, and
Executive’s employment by the Company hereunder, shall be renewed for one year from that anniversary. Thereafter, unless the Company or Executive gives written notice of determination not to renew at least one year prior to the next succeeding
anniversary of the Effective Date, this Agreement shall be renewed for one year from that anniversary. The term “Service Period” shall mean the four year period provided for in this Section 1.1 and any extension
thereof, or any shorter period resulting from any termination of service under Sections 5, 6, 7, 8 or 9 hereof. 

1.2 Position. Executive will be assigned initially to the position of Vice President of Clinical Development and Chief Medical
Officer of the Company. During the term of Executive’s employment with the Company, Executive will devote her best efforts and substantially all of her business time and attention to the business of the Company. 

1.3 Duties. Executive will report to the Chairman of the Board of the Company and/or such other Board officers, company
executives and/or committees designated by the Chairman, performing such duties as are normally associated with her then current position and such duties as are assigned to her from time to time, subject to the oversight and direction of the
Chairman of the Board or his/her designee. Executive shall perform her duties under this Agreement principally out of the Company’s Gaithersburg, Maryland location, or such other location as assigned. In addition, Executive shall make such
business trips to such places as may be necessary or advisable for the efficient operations of the Company. 

 1.4 Company Policies and Benefits. The employment relationship between the parties
shall also be subject to the Company’s personnel policies and procedures as they may be interpreted, adopted, revised or deleted from time to time in the Company’s sole discretion. Executive will be eligible to participate on the same
basis as similarly situated employees in the Company’s benefit plans in effect from time to time during her employment. All matters of eligibility for coverage or benefits under any benefit plan shall be determined in accordance with the
provisions of such plan. The Company reserves the right to change, alter, or terminate any benefit plan in its sole discretion. Notwithstanding the foregoing, in the event that the terms of this Agreement differ from or are in conflict with the
Company’s general employment policies or practices, this Agreement shall control. 
 1.5 Time to be Devoted to Service.
Except for reasonable vacations, absences due to temporary illness, and activities that may be mutually agreed to by the parties, Executive shall devote her entire time, attention and energies during normal business hours and such evenings and
weekends as may be reasonably required for the discharge of her duties to the business of the Company during the Service Period. During the Service Period, Executive will not be engaged in any other business activity, which, in the reasonable
judgment of the Chairman of the Board of the Company, conflicts with the duties of Executive hereunder, whether or not such activity is pursued for gain, profit or other pecuniary advantage. The Company further acknowledges and agrees that, subject
to the prior written approval by a majority of the Board of Directors (which majority shall exclude Executive if Executive is a then current member of the Board of Directors) and consistent with the terms of the Compliance Agreement (as defined
below), Executive may serve on the boards of directors and advisory boards of other companies provided that such service does not interfere with the performance of Executive’s duties hereunder. 

2. COMPENSATION. 

2.1 Base Salary. Executive shall receive for Executive’s services to be rendered hereunder an initial annualized base
salary of $345,500.00, subject to review and adjustment from time to time by the Company in its sole discretion and payable subject to standard federal and state payroll withholding requirements in accordance with Company’s standard payroll
practices (“Base Salary”). 
 2.2 Bonus. Beginning in 2014, Executive shall be eligible to earn an
annual cash bonus pursuant to the Company’s annual performance bonus plan, with the initial target amount of such bonus equal to thirty-five percent (35%) of Executive’s Base Salary during the then current bonus year
(“Target Bonus”), subject to review and adjustment from time to time by the Company in its sole discretion, payable subject to standard federal and state payroll withholding requirements. Whether or not Executive earns any
Target Bonus will be dependent upon (a) the actual achievement by Executive and the Company of the applicable individual and corporate performance goals, as determined by the Board, and (b) Executive’s continuous performance of
services to the Company through the date any Target Bonus is paid. Any bonus earned pursuant to this Section 2.2 will be paid on or before March 15 of the year following the year for which it is earned. 

  
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 2.3 Expense Reimbursement. The Company will reimburse Executive for reasonable
business expenses in accordance with the Company’s standard expense reimbursement policy. 
 3. PROPRIETARY
INFORMATION, INVENTIONS, NON-COMPETITION AND NON-SOLICITATION OBLIGATIONS. The parties
hereto have entered into a Compliance Agreement attached hereto as Exhibit A (the “Compliance Agreement”), which may be amended by the parties from time to time without regard to this Agreement. The Compliance Agreement
contains provisions that are intended by the parties to survive and do survive termination or expiration of this Agreement. 
 4.
NO CONFLICT WITH EXISTING OBLIGATIONS. Executive represents that Executive’s performance of all the terms of this Agreement and
as an Executive of the Company do not and will not breach any agreement or obligation of any kind made prior to Executive’s employment by the Company, including agreements or obligations Executive may have with other employers or entities for
which Executive has provided services. Executive has not entered into, and Executive agrees that Executive will not enter into, any agreement or obligation, either written or oral, in conflict herewith. 

5. TERMINATION DUE TO DEATH OR
DISABILITY. 
 5.1 Death or Disability. If Executive dies while employed
pursuant to this Agreement, then all obligations of the parties hereunder shall terminate immediately. If Executive is incapacitated or disabled by accident, sickness or otherwise so as to render her mentally or physically incapable of performing
the essential functions of her position with or without a reasonable accommodation for a period of 90 consecutive days or longer, or for 90 days in the aggregate during any six-month period (such condition being herein referred to as
“Disability”), the Company, at its option, may terminate Executive’s employment under this Agreement immediately upon giving her notice to that effect. This definition shall be interpreted and applied consistent with the
Americans with Disabilities Act, the Family and Medical Leave Act, and other applicable law. Termination pursuant to this Section 5 is hereinafter referred to as a “Death or Disability Termination”. 

5.2 Substitution. The Board of Directors may designate another employee to act in Executive’s place during any period of
Executive’s Disability during the Service Period. Notwithstanding any such designation, Executive shall continue to receive Executive’s Base Salary and benefits in accordance with Sections 1.4 and 2 of this Agreement until Executive
becomes eligible for disability income under the Company’s disability income insurance (if any) or until the termination of Executive’s employment, whichever shall first occur. 

5.3 Disability Income Payments. While receiving disability income payments under the Company’s disability income insurance
(if any), Executive shall not be entitled to receive any Base Salary, but shall continue to be eligible to participate in all other compensation and benefits in accordance with Sections 1.4 and 2 until the date of her termination. 

  
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 5.4 Verification of Disability. If any question shall arise as to whether during
any period Executive is disabled through any illness, injury, accident or condition of either a physical or psychological nature so as to be unable to perform substantially all of Executive’s duties and responsibilities hereunder, Executive
may, and at the request of the Company shall, submit to a medical examination by a physician selected by the Company to whom Executive or Executive’s guardian has no reasonable objection to determine whether Executive is so disabled and such
determination shall for the purposes of this Agreement be conclusive of the issue. If such question shall arise and Executive shall fail to submit to such medical examination, the Company’s determination of the issue shall be binding on
Executive. 
 6. TERMINATION FOR CAUSE. The
Company, on recommendation from the Board of Directors of the Company, may terminate the employment of Executive hereunder at any time for “cause” (such termination being hereinafter referred to as a “Termination for
Cause”) by giving Executive notice of such termination as described in Section 9.5, upon the giving of such notice termination shall take effect immediately. For the purpose of this Section 6,
“cause” will mean that the Company has determined in its sole discretion that any of the following occurred: (a) Executive’s breach of fiduciary duty or substantial misconduct with respect to the business and
affairs of the Company or any subsidiary or affiliate thereof, (b) Executive’s neglect of duties or failure to act which can reasonably be expected to materially adversely affect the business or affairs of the Company, the Company or any
subsidiary or affiliate thereof, (c) Executive’s material breach of this Agreement, or of any provision of the Compliance Agreement which, to the extent curable, is not cured within 15 days after written notice thereof is given to
Executive, (d) the commission by Executive of an act involving moral turpitude or fraud, (e) Executive’s conviction of any felony, or of any misdemeanor involving fraud, theft, embezzlement, forgery or moral turpitude, (f) other
conduct by Executive that is materially harmful to the business or reputation of the Company, or (g) the expiration of this Agreement. 

7. TERMINATION WITHOUT CAUSE. The Company, on
recommendation from the Board of Directors of the Company, may terminate the employment of Executive hereunder at any time without “cause” (such termination being hereinafter called a “Termination Without Cause”) by
giving Executive notice of such termination as described in Section 9.5. Executive’s termination of employment under this Section 7 will take effect immediately upon the giving of such notice. 

8. RESIGNATION BY EXECUTIVE. 

8.1 Without Good Reason. Any resignation by Executive other than for Good Reason (as defined below) will be referred to
hereinafter as a “Voluntary Termination”. A Voluntary Termination will be deemed to be effective following notice under Section 9.5. 

8.2 With Good Reason. Provided Executive has not previously been notified of the Company’s intention to terminate
Executive’s employment, Executive may resign from employment with the Company for Good Reason (as defined below) by giving the Company written notice of such termination in compliance with Section 9.5 and provided that such notice

  
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specifies: (i) the basis for termination; and (ii) the effective date of termination (such termination being hereinafter referred to as a “Termination for Good
Reason”). For purposes of this Agreement, the term “Good Reason” shall mean any of the following without Executive’s prior written consent: (x) any material diminution of Executive’s duties or
responsibilities hereunder (except in each case in connection with a Termination for Cause or as a result of Executive’s death or Disability), or, the assignment to Executive of duties or responsibilities that are materially inconsistent with
Executive’s then position; provided, however, that the acquisition of the Company and subsequent conversion of the Company to a division or unit of the acquiring company will not by itself result in a diminution of Executive’s
duties or responsibilities; (y) any material breach of the Agreement by the Company which is not cured within 15 business days after written notice thereof is given to the Company; or (z) a relocation of Executive from the Company’s
principal office to a location more than 35 miles from the location of the Company’s principal office, other than on required travel by Executive on the Company’s business or on a temporary basis not to exceed a period equal to two
calendar months. 
 9. EFFECT OF TERMINATION OF
EMPLOYMENT. 
 9.1 Voluntary Termination, Death or Disability Termination,
or a Termination for Cause. Upon the termination of Executive’s employment hereunder pursuant to a Voluntary Termination, Death or Disability Termination, or a Termination for Cause, neither Executive nor her beneficiary or estate will
receive severance payments, or any other severance compensation or benefit, or have any further rights or claims against the Company, its affiliates, or its subsidiaries under this Agreement except to receive: 

(a) the accrued but unpaid portion of Executive’s then current Base Salary, computed on a pro-rata basis to the date of such
termination, subject to the Company’s standard payroll policies; 
 (b) all compensation and benefits payable to Executive
based on her then current participation in any compensation or benefit plan, program or arrangement through the date of termination; and 

(c) reimbursement for any expenses for which Executive shall not have theretofore been reimbursed as provided in the Company’s
standard expense reimbursement policy. 
 9.2 Termination Without Cause or for Good Reason (Other Than Change in Control).
Upon the termination of Executive’s employment hereunder pursuant to a Termination Without Cause or a Termination for Good Reason (other than in connection with a Change in Control (as defined below)), neither Executive nor her beneficiary or
estate will have any further rights or claims against the Company, its affiliates or its subsidiaries under this Agreement except to receive: 

(a) a termination payment equal to that provided for in Section 9.1 hereto; and 

  
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 (b) if Executive executes a general release in favor of the Company, in a form attached
as Exhibit B (the “Release”), and subject to Section 9.2(c) (the date that the Release becomes effective and may no longer be revoked by Executive is referred to as the “Release Date”),
then the Company shall pay to Executive the following severance benefits (such benefits referred to as “Severance Benefits”): (i) continuation of Executive’s then current Base Salary for a period of 12 months from
the Release Date (such applicable period is referred to as the “Severance Period”), less applicable withholdings and deductions, on the Company’s regular payroll dates; and (ii) payment of the premiums of
Executive’s group health insurance COBRA continuation coverage, including coverage for Executive’s eligible dependents, for a maximum period of 12 months following her Termination Without Cause or a Termination for Good Reason (other than
in connection with a Change in Control (as defined below)) (such period subject to the qualifications of this Section 9.2(b) referred to as “COBRA Payment Period”); provided, however, that (a) the
Company shall pay premiums for Executive’s eligible dependents only for coverage for which those eligible dependents were enrolled immediately prior to the Termination Without Cause or Termination for Good Reason; and (b) the
Company’s obligation to pay such premiums shall cease immediately upon Executive’s eligibility for comparable group health insurance provided by a new employer of Executive. Vesting of any unvested stock options and/or other equity
securities shall cease on the date of termination following Executive’s Termination Without Cause or a Termination for Good Reason (other than in connection with a Change in Control (as defined below)). In addition, the Company’s severance
obligation shall be reduced by the amount of any salary received by Executive from another employer during the Severance Period. Executive agrees to inform the Company promptly if she obtains other employment during the Severance Period.
Notwithstanding the foregoing, if at any time the Company determines, in its sole discretion, that the payment of the COBRA premiums would result in a violation of the nondiscrimination rules of Section 105(h)(2) of the Internal Revenue Code of
1988, as amended (the “Code”) or any statute or regulation of similar effect (including, without limitation, the 2010 Patient Protection and Affordable Care Act, as amended by the 2010 Health Care and Education Reconciliation
Act), then in lieu of providing the COBRA premiums, the Company will instead pay Executive, on the first day of each month of the remainder of the COBRA Payment Period, a fully taxable cash payment equal to the COBRA premiums for that month, subject
to applicable tax withholdings and deductions (such amount, the “Special Severance Payment”). 
 (c) To
receive the Severance Benefits pursuant to Section 9.2(b), Executive’s termination or resignation must constitute a “separation from service” (as defined under Treasury Regulation Section 1.409A-1(h)) and Executive
must execute and allow the Release to become effective within 60 days of Executive’s termination or resignation. Executive’s ability to receive the Severance Benefits pursuant to Section 9.2(b) is further conditioned upon her:
returning all Company property; complying with her post-termination obligations under this Agreement and the Compliance Agreement, and complying with the Release including without limitation any non-disparagement and confidentiality provisions
contained therein. The Severance Benefits provided to Executive pursuant to Section 9.2(b) are in lieu of, and not in addition to, any benefits to which Executive may otherwise be entitled under any Company severance plan, policy or
program. 
 (d) The damages (if any) caused to Executive by a Termination Without Cause or a Termination for Good Reason would be
difficult to ascertain; therefore, the 

  
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Severance Benefits for which Executive is eligible pursuant to Section 9.2(b) above in exchange for the Release is agreed to by the parties as liquidated damages, to serve as full
compensation, and not a penalty 
 9.3 Change in Control Severance Benefits.  

(a) In the event that the Company (or any surviving or acquiring corporation) terminates Executive’s employment for a Termination
Without Cause or Executive resigns in connection with a Termination for Good Reason within 12 months following the effective date of a Change in Control (“Change in Control Termination”), and upon compliance with
Section 9.2(c) above, Executive shall be eligible to receive the following Change in Control severance benefits: (i) a lump-sum cash payment in an amount equal to Executive’s annual Base Salary then in effect for a period of 12
months, less applicable withholdings and deductions, paid within 60 days following the Change in Control Termination; (ii) an amount equal to Executive’s Target Bonus award for the 12 month period immediately prior to Executive’s
Change in Control Termination (thirty-five percent (35%) of Executive’s annual Base Salary), paid within 60 days following the Change in Control Termination; and (iii) the Company (or any surviving or acquiring corporation) shall pay
the premiums of Executive’s group health insurance COBRA continuation coverage, including coverage for Executive’s eligible dependents, during the 12 month period following a Change in Control Termination (such period subject to the
qualifications of this Section 9.3(a) referred to as “CIC COBRA Payment Period”); provided, however, that (a) the Company (or any surviving or acquiring corporation) shall pay premiums for
Executive’s eligible dependents only for coverage for which those eligible dependents were enrolled immediately prior to the Change in Control Termination; and (b) the Company’s (or any surviving or acquiring corporation’s)
obligation to pay such premiums shall cease immediately upon Executive’s eligibility for comparable group health insurance provided by a new employer of Executive. Executive agrees that the Company’s (or any surviving or acquiring
corporation’s) payment of health insurance premiums will satisfy its obligations under COBRA for the period provided. No insurance premium payments will be made following the effective date of Executive’s coverage by a health insurance
plan of a subsequent employer. For the balance of the period that Executive is entitled to coverage under federal COBRA law, if any, Executive shall be entitled to maintain such coverage at Executive’s own expense. Notwithstanding the
foregoing, if at any time the Company determines, in its sole discretion, that the payment of the COBRA premiums would result in a violation of the nondiscrimination rules of Section 105(h)(2) of the Code or any statute or regulation of similar
effect (including, without limitation, the 2010 Patient Protection and Affordable Care Act, as amended by the 2010 Health Care and Education Reconciliation Act), then in lieu of providing the COBRA premiums, the Company will instead pay Executive,
on the first day of each month of the remainder of the CIC COBRA Payment Period, the Special Severance Payment. 
 (b) To receive
the payments in Section 9.3(a), Executive’s termination or resignation must constitute a “separation from service” (as defined under Treasury Regulation Section 1.409A-1(h)) and Executive must execute and allow the
Release to become effective within 60 days of Executive’s termination or resignation. Executive’s ability to receive benefits pursuant to Section 9.3(a) is further conditioned upon her: returning all Company property; complying
with her post-termination obligations under this Agreement and the Compliance Agreement, and complying with the Release including without limitation any non-disparagement and confidentiality provisions contained therein. 

  
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 (c) In addition, notwithstanding anything contained in Executive’s stock option or
other equity award agreements to the contrary, upon a Change in Control Termination, Executive shall receive accelerated vesting of all then unvested shares of the Company’s Common Stock that she then may have, if any. 

(d) As used in this Agreement, a “Change in Control” is defined as the first to occur of the following:
(a) a sale, lease, exchange or other transfer in one transaction or a series of related transactions of all or substantially all of the assets of the Company (other than the transfer of the Company’s assets to a majority-owned subsidiary
corporation); (b) a merger or consolidation in which the Company is not the surviving corporation (unless the holders of the Company’s outstanding voting stock immediately prior to such transaction own, immediately after such transaction,
securities representing at least fifty percent (50%) of the voting power of the corporation or other entity surviving such transaction); (c) a reverse merger in which the Company is the surviving corporation but the shares of the
Company’s common stock outstanding immediately preceding the merger are converted by virtue of the merger into other property, whether in the form of securities, cash or otherwise (unless the holders of the Company’s outstanding voting
stock immediately prior to such transaction own, immediately after such transaction, securities representing at least fifty percent (50%) of the voting power of the Company); or (d) any transaction or series of related transactions in
which in excess of 50% of the Company’s voting power is transferred. Notwithstanding the foregoing, to the extent that the Company determines that any of the payments or benefits under this Agreement that are payable in connection with a Change
in Control constitute deferred compensation under Section 409A that may only be paid on a qualifying transaction (that is, they are not “exempt” under 409A), the foregoing definition of Change in Control shall apply only to the extent
the transaction also meets the definition used for purposes of Treasury Regulation Section 1.409A-3(a)(5), that is, as defined under Treasury Regulation Section 1.409A-3(i)(5). 

9.4 Parachute Taxes. 

(a) If any payment or benefit Executive would receive from the Company or otherwise in connection with a Change of Control or other
similar transaction (“Payment”) would (i) constitute a “parachute payment” within the meaning of Section 280G of the Code, and (ii) but for this sentence, be subject to the excise tax imposed by
Section 4999 of the Code (the “Excise Tax”), then such Payment will be equal to the Reduced Amount. The “Reduced Amount” will be either (x) the largest portion of the Payment that would
result in no portion of the Payment being subject to the Excise Tax, or (y) the largest portion, up to and including the total, of the Payment, whichever amount ((x) or (y)), after taking into account all applicable federal, state and local
employment taxes, income taxes, and the Excise Tax (all computed at the highest applicable marginal rate), results in Executive’s receipt of the greater economic benefit notwithstanding that all or some portion of the Payment may be subject to
the Excise Tax. If a Reduced Amount will give rise to the greater after tax benefit, the reduction in the Payments will occur in the following order: (a) reduction of cash payments; (b) cancellation of accelerated vesting of equity awards
other than stock options; (c) cancellation of accelerated vesting of stock options; and (d) reduction of other benefits paid to Executive. Within any such 

  
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category of payments and benefits (that is, (a), (b), (c) or (d)), a reduction will occur first with respect to amounts that are not “deferred compensation” within the meaning of
Section 409A and then with respect to amounts that are. In the event that acceleration of compensation from Executive’s equity awards is to be reduced, such acceleration of vesting will be canceled, subject to the immediately preceding
sentence, in the reverse order of the date of grant. 
 (b) The registered public accounting firm engaged by the Company for general
audit purposes as of the day prior to the effective date of the event described in Section 280G(b)(2)(A)(i) of the Code will perform the foregoing calculations. If the registered public accounting firm so engaged by the Company is serving as
accountant or auditor for the acquirer or is otherwise unable or unwilling to perform the calculations, the Company will appoint a nationally recognized firm that has expertise in these calculations to make the determinations required hereunder. The
Company will bear all expenses with respect to the determinations by such independent registered public accounting firm required to be made hereunder. The firm engaged to make the determinations hereunder will provide its calculations, together with
detailed supporting documentation, to the Company and Executive within 30 calendar days after the date on which Executive’s right to a Payment is triggered (if requested at that time by the Company or Executive) or such other time as reasonably
requested by the Company or Executive. Any good faith determinations of the independent registered public accounting firm made hereunder will be final, binding and conclusive upon the Company and Executive. 

9.5 Notice; Effective Date of Termination. 

(a) Termination of Executive’s employment pursuant to this Agreement shall be effective on the earliest of: 

(i) immediately after the Company gives notice to Executive of Executive’s Termination for Cause or Termination Without Cause
unless the Company specifies a later date, in which case, termination shall be effective as of such later date; 
 (ii) immediately
upon Executive’s death; 
 (iii) immediately after the Company gives notice to Executive of Executive’s termination on
account of Executive’s Disability, unless the Company specifies a later date, in which case, termination shall be effective as of such later date, provided that Executive has not returned to the full time performance of Executive’s duties
prior to such date; or 
 (iv) 10 days after Executive gives written notice to the Company of Executive’s resignation for a
Voluntary Termination or Resignation for Good Reason; provided that the Company may set a termination date at any time between the date of notice and the date of resignation, in which case Executive’s resignation shall be effective as of
such other date. Executive will receive compensation through any required notice period. 
 (b) In the event notice of a termination
under subsections (a)(i), (iii) and (iv) is given orally, at the other party’s request, the party giving notice must provide written confirmation of such notice within 5 business days of the request in compliance with the requirement
of Section 10.1 below. 

  
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 9.6 Cooperation With Company After Termination of Employment. Following termination
of Executive’s employment for any reason, Executive shall fully cooperate with the Company in all matters relating to the winding up of Executive’s pending work including, but not limited to, any litigation in which the Company is
involved, and the orderly transfer of any such pending work to such other employees as may be designated by the Company. 
 9.7
Application of Section 409A. It is intended that all of the benefits and payments under this Agreement satisfy, to the greatest extent possible, the exemptions from the application of Code Section 409A provided under Treasury
Regulations 1.409A-1(b)(4) and 1.409A-1(b)(9), and this Agreement will be construed to the greatest extent possible as consistent with those provisions. If not so
exempt, this Agreement (and any definitions hereunder) will be construed in a manner that complies with Section 409A, and incorporates by reference all required definitions and payment terms. For purposes of Code Section 409A (including,
without limitation, for purposes of Treasury Regulation Section 1.409A-2(b)(2)(iii)), Executive’s right to receive any installment payments under this Agreement (whether severance payments,
reimbursements or otherwise) will be treated as a right to receive a series of separate payments and, accordingly, each installment payment hereunder will at all times be considered a separate and distinct payment. Notwithstanding any provision to
the contrary in this Agreement, if Executive is deemed by the Company at the time of her Separation from Service to be a “specified employee” for purposes of Code Section 409A(a)(2)(B)(i), and if any of the payments upon Separation
from Service set forth herein and/or under any other agreement with the Company are deemed to be “deferred compensation”, then if delayed commencement of any portion of such payments is required to avoid a prohibited distribution under
Code Section 409A(a)(2)(B)(i) and the related adverse taxation under Section 409A, the timing of the payments upon a Separation from Service will be delayed as follows: on the earlier to occur of (i) the date that is six months and
one day after the effective date of Executive’s Separation from Service, and (ii) the date of Executive’s death (such earlier date, the “Delayed Initial Payment Date”), the Company will (A) pay to
Executive a lump sum amount equal to the sum of the payments upon Separation from Service that Executive would otherwise have received through the Delayed Initial Payment Date if the commencement of the payments had not been delayed pursuant to this
paragraph, and (B) commence paying the balance of the payments in accordance with the applicable payment schedules set forth above. No interest will be due on any amounts so deferred. To the extent that any severance payments or benefits
payable to Executive pursuant to this Agreement are not otherwise exempt from the application of Code Section 409A, then, if the period during which Executive may consider and sign the Release spans two calendar years, the payment of severance
will not be made or begin until the later calendar year. 
 10. GENERAL PROVISIONS.

 10.1 Notices. Any notices required hereunder to be in writing shall be deemed effectively given: (a) upon personal
delivery to the party to be notified, (b) when sent by electronic mail or confirmed facsimile if sent during normal business hours of the recipient, and if not, then on the next business day, (c) 5 days after having been sent by registered
or certified mail, return receipt requested, postage prepaid, or (d) 1 day after deposit with a nationally recognized overnight courier, specifying next day delivery, with written verification of receipt. All communications shall be sent to the
Company, “Attention Chairman of the Board,” at its 

  
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primary office location and to Executive at Executive’s address as listed on the Company payroll, or at such other address as the Company or Executive may designate by 10 days advance
written notice to the other. 
 10.2 Severability. Whenever possible, each provision of this Agreement will be interpreted in
such manner as to be effective and valid under applicable law, but if any provision of this Agreement is held to be invalid, illegal or unenforceable in any respect under any applicable law or rule in any jurisdiction, such invalidity, illegality or
unenforceability will not affect any other provision or any other jurisdiction, but this Agreement will be reformed, construed and enforced in such jurisdiction as if such invalid, illegal or unenforceable provisions had never been contained herein.

 10.3 Waiver. If either party should waive any breach of any provisions of this Agreement, Executive or the Company shall
not thereby be deemed to have waived any preceding or succeeding breach of the same or any other provision of this Agreement. 
 10.4
Complete Agreement. This Agreement constitutes the entire agreement between Executive and the Company with regard to the subject matter hereof. This Agreement is the complete, final, and exclusive embodiment of their agreement with regard
to this subject matter and supersedes any prior oral discussions or written communications and agreements, including the Prior Agreement. This Agreement is entered into without reliance on any promise or representation other than those expressly
contained herein, and it cannot be modified or amended except in writing signed by Executive and an authorized officer of the Company. The parties have entered into a separate Compliance Agreement and have or may enter into separate agreement
related to stock awards. These separate agreements govern other aspects of the relationship between the parties, have or may have provisions that survive termination of Executive’s employment under this Agreement, may be amended or superseded
by the parties without regard to this Agreement and are enforceable according to their terms without regard to the enforcement provision of this Agreement. 

10.5 Further Assurances. Executive agrees to execute, acknowledge, seal and deliver such further assurances, documents,
applications, agreements and instruments, and to take such further actions, as the Company may reasonably request in order to accomplish the purposes of this Agreement. 

10.6 Counterparts. This Agreement may be executed in separate counterparts, any one of which need not contain signatures of more
than one party, but all of which taken together will constitute one and the same Agreement. 
 10.7 Headings. The headings of
the sections hereof are inserted for convenience only and shall not be deemed to constitute a part hereof nor to affect the meaning thereof. 

10.8 Successors and Assigns. This Agreement is intended to bind and inure to the benefit of and be enforceable by Executive and
the Company, and their respective successors, assigns, heirs, executors and administrators, except that Executive may not assign any of her duties hereunder and she may not assign any of her rights hereunder without the written consent of the
Company, which shall not be withheld unreasonably. 

  
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 10.9 Choice of Law. All questions concerning the construction, validity and
interpretation of this Agreement will be governed by the law of the State of Maryland, without giving effect to choice of law principles. Executive and the Company hereby expressly consent to the personal jurisdiction and venue of the state and
federal courts located in the State of Maryland for any claims or suits arising from or related to this Agreement. 
 IN
WITNESS WHEREOF, the parties have executed this Executive Employment Agreement on the day and year first written above. 
  

									
	GLYCOMIMETICS, INC.	 		 	EXECUTIVE:
			
	 /s/ Rachel K. King
	 		 	 /s/ Helen M. Thackray

	(Signature)	 		 	(Signature)
					
	By:	 	Rachel K. King	 		 	By:	 	Helen M. Thackray
					
	Title:	 	Chief Executive Officer	 		 		 	

  
 12 

 Exhibit A 

Compliance Agreement 

 Exhibit B 

Release Agreement 
 This
Release Agreement (“Release”) is made by and between GLYCOMIMETICS, INC. (the “Company”) and Helen Thackray (“you”). You and the Company entered into an Employment
Agreement dated January 15, 2014 (the “Employment Agreement”). You and the Company hereby further agree as follows: 

1. A blank copy of this Release was attached to the Employment Agreement as Exhibit B. 

2. Severance Payments. If your employment was terminated by the Company for a Termination Without Cause, a Termination for Good Reason,
or a Change in Control Termination (as defined in the Employment Agreement) in accordance with Section 9 of the Employment Agreement, then in consideration for your execution, return and non-revocation of this Release, following the Release
Date (as defined in Section 3 below) the Company will provide severance benefits to you as follows: [described benefits and payment schedule]. 

3. Release by You. In exchange for the payments and other consideration under this Agreement, to which you would not otherwise be
entitled, and except as otherwise set forth in this Agreement, you hereby generally and completely release, acquit and forever discharge the Company, its parents and subsidiaries, and its and their officers, directors, managers, partners, agents,
servants, employees, attorneys, shareholders, successors, assigns and affiliates (the “Releasees”), of and from any and all claims, liabilities, demands, causes of action, costs, expenses, attorneys fees, damages, indemnities
and obligations of every kind and nature, in law, equity, or otherwise, both known and unknown, suspected and unsuspected, disclosed and undisclosed, arising out of or in any way related to agreements, events, acts or conduct at any time prior to
and including the execution date of this Agreement, including but not limited to: all such claims and demands directly or indirectly arising out of or in any way connected with your employment with the Company or the termination of that employment;
claims or demands related to salary, bonuses, commissions, stock, stock options, or any other ownership interests in the Company, vacation pay, fringe benefits, expense reimbursements, severance pay, or any other form of compensation; claims
pursuant to any federal, state or local law, statute, or cause of action; tort law; or contract law. The claims and causes of action you are releasing and waiving in this Agreement include, but are not limited to, any and all claims and causes of
action that the Company, its parents and subsidiaries, and its and their respective officers, directors, agents, servants, employees, attorneys, shareholders, successors, assigns or affiliates: 

 

	 	•	 	has violated its personnel policies, handbooks, contracts of employment, or covenants of good faith and fair dealing; 

  

	 	•	 	 has discriminated against you on the basis of age, race, color, sex (including sexual harassment), national origin, ancestry, disability, religion,
sexual orientation, marital status, parental status, source of income, entitlement to benefits, any union activities or other protected category in violation of any local, state or federal law, constitution, ordinance, or regulation, including but
not limited to: the Age 

	 	 
Discrimination in Employment Act, as amended (“ADEA”); Title VII of the Civil Rights Act of 1964, as amended; 42 U.S.C. § 1981, as amended; the Civil Rights Act of 1866; the
Fair Employment Practice Act of Maryland, Md. Code Ann., State Government, Title 20; the Worker Adjustment Retraining and Notification Act; the Equal Pay Act; the Americans With Disabilities Act; the Family Medical Leave Act; the Occupational Safety
and Health Act; the Immigration Reform and Control Act; the Uniform Services Employment and Reemployment Rights Act of 1994, as amended; Section 510 of the Employee Retirement Income Security Act; and the National Labor Relations Act;

  

	 	•	 	has violated any statute, public policy or common law (including but not limited to claims for retaliatory discharge; negligent hiring, retention or supervision; defamation; intentional or negligent infliction of
emotional distress and/or mental anguish; intentional interference with contract; negligence; detrimental reliance; loss of consortium to you or any member of your family and/or promissory estoppel). 

Notwithstanding the foregoing, you are not releasing any right of indemnification you may have for any liabilities arising from your actions within the course
and scope of your employment with the Company or within the course and scope of your role as a member of the Board of Directors and/or officer of the Company. Also excluded from this Agreement are any claims which cannot be waived by law. You are
waiving, however, your right to any monetary recovery should any governmental agency or entity, such as the EEOC or the DOL, pursue any claims on your behalf. You acknowledge that you are knowingly and voluntarily waiving and releasing any rights
you may have under the ADEA, as amended. You also acknowledge that (i) the consideration given to you in exchange for the waiver and release in this Agreement is in addition to anything of value to which you were already entitled, and
(ii) that you have been paid for all time worked, have received all the leave, leaves of absence and leave benefits and protections for which you are eligible, and have not suffered any on-the-job injury
for which you have not already filed a claim. You further acknowledge that you have been advised by this writing that: (a) your waiver and release do not apply to any rights or claims that may arise after the execution date of this Agreement;
(b) you have been advised hereby that you have the right to consult with an attorney prior to executing this Agreement; (c) you have twenty-one (21) days [in the event of a group release 21 days becomes 45 days] to consider
this Agreement (although you may choose to voluntarily execute this Agreement earlier); (d) you have seven (7) days following your execution of this Agreement to revoke the Agreement; and (e) this Agreement shall not be effective
until the date upon which the revocation period has expired unexercised, which shall be the eighth day after this Agreement is executed by you provided the Company has also executed the Release on or before that date (the “Release
Date”). 
 4. Return of Company Property. Within ten (10) days of the effective date of the termination of
employment, you agree to return to the Company all Company documents (and all copies thereof) and other Company property then in existence that you have had in your possession at any time, including, but not limited to, Company files, notes,
drawings, records, business plans and forecasts, financial information, specifications, computer-recorded information, tangible property (including, but not limited to, computers), credit cards, entry cards, identification badges and keys; and, any
materials of any kind that contain or embody any proprietary or confidential information of the Company (and all reproductions thereof). Receipt of the Severance described in paragraph 2 of this Release expressly conditioned upon return of all
such Company Property. 

  
 2 

 5. Confidentiality. The provisions of this Release will be held in strictest confidence by
you and will not be publicized or disclosed in any manner whatsoever; provided, however, that: (a) you may disclose this Agreement in confidence to your immediate family; (b) you may disclose this Agreement in confidence to your
attorney, accountant, auditor, tax preparer, and financial advisor; and (c) you may disclose this Release insofar as such disclosure may be required by law. 

6. Proprietary Information and Post-Termination Obligations. Both during and after your employment you acknowledge your continuing
obligations under your Compliance Agreement (“Compliance Agreement”) not to use or disclose any confidential or proprietary information of the Company and to refrain from certain solicitation and competitive activities. 

7. Non-Disparagement. You agree not to disparage the Company, and the Company’s attorneys, directors, managers, partners,
employees, agents and affiliates, in any manner likely to be harmful to them or their business, business reputation or personal reputation; provided that you may respond accurately and fully to any question, inquiry or request for information when
required by legal process.  
 8. No Admission. This Agreement does not constitute an admission by the Company of any wrongful
action or violation of any federal, state, or local statute, or common law rights, including those relating to the provisions of any law or statute concerning employment actions, or of any other possible or claimed violation of law or rights. 

9. Breach. You agree that upon any material breach of this Release you will forfeit all amounts paid or owing to you under this
Release. Further, you acknowledge that it may be impossible to assess the damages caused by your material violation of the terms of paragraphs 4, 5, 6, and 7 of this Release and further agree that any threatened or actual material violation or
breach of those paragraphs of this Release will constitute immediate and irreparable injury to the Company. You therefore agree that any such breach of this Release is a material breach of this Agreement, and, in addition to any and all other
damages and remedies available to the Company upon your breach of this Agreement, the Company shall be entitled to an injunction to prevent you from violating or breaching this Agreement. 

10. Miscellaneous. This Release, together with your Compliance Agreement, constitute the complete, final and exclusive embodiment of
the entire agreement between you and the Company with regard to this subject matter. It is entered into without reliance on any promise or representation, written or oral, other than those expressly contained herein, and it supersedes any other such
promises, warranties or representations. This Release may not be modified or amended except in a writing signed by both you and a duly authorized officer of the Company. This Release will bind the heirs, personal representatives, successors and
assigns of both you and the Company, and inure to the benefit of both you and the Company, their heirs, successors and assigns. If any provision of this Release is determined to be invalid or unenforceable, in whole or in part, this determination
will not affect any other provision of this Agreement and the provision in question will be modified by the court so as to be rendered enforceable. This Release will be 

  
 3 

 
deemed to have been entered into and will be construed and enforced in accordance with the laws of the State of Maryland as applied to contracts made and performed entirely within the State of
Maryland. 
  

							
	GLYCOMIMETICS, INC.
				
	By:	 	  
	 		 	  

		 	 Chief Executive Officer
	 		 	 Date

			
	EXECUTIVE	 		 	
			
	  
	 		 	  

	 Helen Thackray
	 		 	 Date

  
 4EX-10.19

 Exhibit 10.19 

EXECUTIVE EMPLOYMENT AGREEMENT 

THIS EXECUTIVE EMPLOYMENT AGREEMENT (this “Agreement”) dated as of May 19, 2003, is by and between, GLYCOMIMETICS, INC.,
a Delaware corporation (the “Company”) and John Magnani, Ph.D. (the “Executive”). 
 WHEREAS, the
Executive will, as of the date of the Initial Closing under the Series A Convertible Preferred Stock Purchase Agreement, by and among the Company and certain Purchasers listed therein (the “Purchase Agreement”), be an employee of
Administaff Companies, Inc. (“Administaff”) for certain purposes specified in the Client Service Agreement between Administaff and the Company (the “Service Agreement” ), the Executive is an employee of the Company
for certain purposes specified in the Service Agreement, and the Executive will, of the date of the Initial Closing under the Purchase Agreement, be a co-employee of the Company and Administaff for certain purposes specified in the Service
Agreement; 
 WHEREAS, the Company wishes to have the services of the Executive, and the Executive wishes to be assigned to the Company to
serve in the capacity identified in Section 3 below and to be employed by the Company and Administaff as contemplated by the Service Agreement; 

WHEREAS, Administaff is willing to assign the Executive to the Company to service in the capacity identified in Section 3 below;

 WHEREAS, the Company and the Executive desire to establish the terms and conditions of the Executive’s services and employment as
hereinafter set forth; and 
 WHEREAS, the benefits to the Executive contemplated by this Agreement will be provided in part by the Company
and in part by Administaff, in accordance with the terms and conditions of the Service Agreement. 
 NOW, THEREFORE, in consideration of the
mutual covenants and obligations hereinafter set forth, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 

1. Employment. The Executive hereby agrees to be employed by the Company, and the Company hereby agrees to employ the Executive, upon
the terms and conditions hereinafter set forth. 
 2. Term. Subject to the provisions of Sections 6, 7, 8, and
9 hereof, the term of the provision of services hereunder will be for the four year period commencing on May 19, 2003 (the Commencement Date”) and ending on the fourth anniversary of the Commencement Date. Unless the Company
gives notice of its intent not to renew the Executive’s assignment and employment hereunder, or the Executive gives written notice to the Company of his determination not to renew his service and employment hereunder, in any case at least one
year prior to the fourth anniversary of the Commencement Date, this Agreement, and the Executive’s employment by the Company hereunder, shall be renewed for one year from that anniversary. Thereafter, unless the Company or the Executive gives
written notice of determination not to renew at least one year prior to the next succeeding anniversary of the Commencement Date, this Agreement shall be renewed for one year from that anniversary. The term “Service Period” shall
mean the four year period provided for in this Section 2 and any extension thereof, or any shorter period resulting from any termination of service under Sections 6. 7, 8 or 9 hereof. 

 3. Duties and Responsibilities. The Executive will be assigned as the Vice President and
Chief Scientific Officer of the Company. The Executive will perform such duties and services as are customary for the position of Vice President and Chief Scientific Officer in corporations similar to the Company and such other duties as may be
assigned to him from time to time by the Chairman of the Board of the Company or his designee. In furtherance of the foregoing, the Executive hereby agrees to perform well and faithfully such duties and responsibilities and the other reasonable
duties and responsibilities assigned to him from time to time by the Chairman of the Board of the Company or his designee. 
 4. Time to
be Devoted to Service. Except for reasonable vacations, absences due to temporary illness, and activities that may be mutually agreed to by the parties, the Executive shall devote his entire time, attention and energies during normal business
hours and such evenings and weekends as may be reasonably required for the discharge of his duties to the business of the Company during the Service Period. During the Service Period, the Executive will not be engaged in any other business activity,
which, in the reasonable judgment of the Chairman of the Board of the Company, conflicts with the duties of the Executive hereunder, whether or not such activity is pursued for gain, profit or other pecuniary advantage. The Company acknowledges and
agrees that the Executive’s current activities in owning and operating a business relating exclusively to sales of chemical and biological reagents, apparatuses, assay kits and diagnostics, all sold not for use directly in humans and none of
which compete with the business of the Company, as currently conducted. The Company further acknowledges and agrees that, subject to the prior written approval by a majority of the Board of Directors (which majority shall exclude the Executive if
the Executive is a then current member of the Board of Directors) and consistent with the terms of the Compliance Agreement (as defined below), the Executive may serve on the boards of directors and advisory boards of other companies provided that
such service does not interfere with the performance of Executive’s duties hereunder. 
 5. Compensation; Reimbursement. 

5.1 Base Salary. The Executive’s annual base salary (the “Base Salary”) will be not less than $175,000. This Base
Salary, and all other compensation and reimbursements under the Agreement, may be provided through Administaff, and the Base Salary will be payable in such installments as are applicable to employees of the Company and/or Administaff at
substantially the same service level as the Executive. Said Base Salary is subject to increase on the recommendation of the Board of Directors of the Company (the “Board”) or a committee thereof, as exercised from time to time. 

5.2 Fringe Benefits. During the Service Period, the Executive will be entitled to the fringe benefits that are made available from time
to time to, and will be eligible for bonuses on the same terms as may be offered from time to time to, officers of the Company (or assigned to the Company by Administaff). In addition, the Executive will be entitled to the specific benefits listed
in Schedule 1 attached hereto. 
 5.3 Reimbursements. The Executive will be reimbursed, in accordance with the practice
applicable to officers of the Company from time to time, for all reasonable and necessary traveling expenses and other disbursements incurred by him for or on behalf of the Company in the performance of his duties hereunder upon presentation by the
Executive of appropriate vouchers. 
 5.4 Equity Compensation. The Executive will be entitled to purchase, effective as of the
Commencement Date, 320,000 shares of the Company’s common stock, par value $.001 per share, for a purchase price of $.001 per share, which shares shall be subject to a Restricted Stock Agreement between the Company and the Executive, in
substantially the form attached hereto as Exhibit A (the “Restricted Stock 

  
 - 2 - 

 
Agreement”) (which the Company and the Executive shall execute separately). The Executive may, from time to time, be entitled to receive stock options and other equity-based
incentives as determined by the Board of Directors, in its sole and exclusive discretion. 
 6. Involuntary Termination. 

6.1 Disability. If the Executive dies, then the Executive’s employment by the Company hereunder and under the Service Agreement
shall be deemed to terminate on the date of the Executive’s death. If the Executive is incapacitated or disabled by accident, sickness or otherwise so as to render him mentally or physically incapable of performing the services required to be
performed by him under this Agreement for a period of 90 consecutive days or longer, or for 90 days during any six-month period (such condition being herein referred to as “Disability”), the Company, at its option, may terminate the
Executive’s employment under this Agreement and his assignment to the Company under the Service Agreement immediately upon giving him notice to that effect. In the case of a Disability, until the Company shall have terminated the
Executive’s service in accordance with the foregoing, the Executive will be entitled to receive compensation, at the rate and in the manner provided in Section 5, notwithstanding any such physical or mental disability. Termination
pursuant to this Section 6 is hereinafter referred to as an “Involuntary Termination”. 
 6.2
Substitution. The Board of Directors may designate another employee to act in the Executive’s place during any period of the Executive’s disability during the Service Period. Notwithstanding any such designation, the Executive shall
continue to receive the Executive’s Base Salary and benefits in accordance with Section 5 of this Agreement until the Executive becomes eligible for disability income under the Company’s disability income insurance (if any) or
until the termination of the Executive’s employment, whichever shall first occur. 
 6.3 Disability Income Payments. While
receiving disability income payments under the Company’s disability income insurance (if any), the Executive shall not be entitled to receive any Base Salary under Section 5.1, but shall continue to participate in all other
compensation and benefits in accordance with Section 5.2 until the Termination Date. 
 6.4 Verification of Disability.
If any question shall arise as to whether during any period the Executive is disabled through any illness, injury, accident or condition of either a physical or psychological nature so as to be unable to perform substantially all of the
Executive’s duties and responsibilities hereunder, the Executive may, and at the request of the Company shall, submit to a medical examination by a physician selected by the Company to whom the Executive or the Executive’s guardian has no
reasonable objection to determine whether the Executive is so disabled and such determination shall for the purposes of this Agreement be conclusive of the issue. If such question shall arise and Executive shall fail to submit to such medical
examination, the Company’s determination of the issue shall be binding on the Executive. 
 7. Termination For Cause. The
Company, on recommendation from the Board of Directors of the Company, may terminate the service of the Executive hereunder and under the Service Agreement at any time during the Service Period for “cause” (such termination being
hereinafter referred to as a “Termination for Cause”) by giving the Executive notice of such termination, upon the giving of which such termination shall take effect immediately. For the purpose of this Section 7.
“cause” will mean (a) the Executive’s willful and substantial misconduct with respect to the business and affairs of the Company or any subsidiary or affiliate thereof, (b) the Executive s neglect of duties or failure
to act which can reasonably be expected to materially adversely affect the business or affairs of the Company, the Company or any subsidiary or affiliate thereof, (c) the Executive’s material breach of any of the agreements contained in
Section 3 or 4 hereof, or of any provision of the Compliance Agreement which, to the extent curable, is not cured within 15 days after written notice thereof is 

  
 - 3 - 

 
given to the Executive, (d) the commission by the Executive of an act involving moral turpitude or fraud, (e) the Executive s conviction of any felony, or of any misdemeanor involving
fraud, theft, embezzlement, forgery or moral turpitude, or (f) other conduct by the Executive, outside the ordinary course of the Company’s business, that is materially harmful to the business or reputation of the Company. 

8. Termination Without Cause. The Company, on recommendation from the Board of Directors of the Company, may terminate the services of
the Executive hereunder and under the Service Agreement at any time during the Service Period without “cause” (such termination being hereinafter called a “Termination Without Cause”) by giving the Executive notice of such
termination. The termination of service under this Section 8 will take effect immediately upon the giving of such notice. 
 9.
Termination by the Executive. 
 9.1 Without Good Reason. Any termination of the service of the Executive hereunder and under
the Service Agreement otherwise than as a result of an Involuntary Termination, a Termination For Cause or a Termination Without Cause will be referred to hereinafter as a “Voluntary Termination”. A Voluntary Termination will be
deemed to be effective following reasonable notice by the appropriate party 
 9.2 With Good Reason. The Executive may terminate the
services of such Executive hereunder and under the Service Agreement at any time for Good Reason (as defined below) by giving the Company written notice of such termination, provided that such notice specifies: (i) the basis for termination and
(ii) the effective date of termination (such termination being hereinafter referred to as a “Termination for Good Reason”). For purposes of this Agreement, the term “Good Reason” shall mean (x) any
material diminution of the Executive’s duties or responsibilities hereunder (except in each case in connection with the Termination for Cause or as a result of the Executive’s death or disability), or, the assignment to the Executive of
duties or responsibilities that are materially inconsistent with the Executive’s then position; (y) any material breach of the Agreement by the Company which is not cured within 15 business days after written notice thereof is given to the
Company; or (z) a relocation of the Executive from the Company’s principal office to a location more than 35 miles from the location of the Company’s principal office as of the Commencement Date, other than on a temporary basis not to
exceed a period equal to two calendar months. 
 10. Effect of Termination on Services. 

10.1 Voluntary Termination or a Termination for Cause. Upon the termination of the Executive’s services hereunder pursuant to a
Voluntary Termination or a Termination for Cause, neither the Executive nor his beneficiary or estate will have any further rights or claims against Administaff or the Company, its affiliates, or its subsidiaries under this Agreement or the Service
Agreement except to receive: 
 (i) the unpaid portion of the Base Salary provided for in Section 5.1. computed on a pro
rata basis to the date of such termination; and 
 (ii) reimbursement for any expenses for which the Executive shall not have
theretofore been reimbursed as provided in Section 5.3. 
 10.2 Involuntary Termination. Upon the termination of the
Executive’s services hereunder pursuant to an Involuntary Termination, neither the Executive nor his beneficiary or estate will have any further rights or claims against Administaff or the Company, its affiliates or its subsidiaries under this
Agreement or the Service Agreement except to receive 

  
 - 4 - 

 (i) a termination payment equal to that provided for in Section 10.1 hereto, and

 (ii) an aggregate amount equal to the Base Salary and fringe benefits for six months, payable at the same rate and in the same manner as
set forth in Sections 5.1 and 5.2 hereof. 
 10.3 Termination without Cause or for Good Reason. Upon the termination of
the Executive’s services hereunder pursuant to a Termination Without Cause or a Termination for Good Reason, neither the Executive nor his beneficiary or estate will have any further rights or claims against Administaff or the Company, its
affiliates or its subsidiaries under this Agreement or the Service Agreement except to receive 
 (i) a termination payment equal to that
provided for in Section 10.1 hereof, and 
 (ii) an aggregate amount equal to the Base Salary and fringe benefits for two years
(the “Severance Period”), payable at the same rate and in the same manner as set forth in Sections 5.1 and 5.2 hereof. 

10.4 COBRA Benefits. As required by law, the Company shall permit the Executive to participate, at the Executive’s own expense, in
the Company’s group medical insurance plan for a period of 18 months after the Termination Date, subject to the terms of the applicable plan documents and other applicable restrictions relating to such plan. 

10.5 Liquidated Damages. The parties acknowledge and agree that damages which will result to the Executive for termination by the
Company without Cause or other breach of this Agreement by the Company shall be extremely difficult or impossible to establish or prove, and agree that the payments made to the Executive during the Severance Period shall constitute liquidated
damages for any breach of this Agreement by the Company through the Termination Date. The Executive agrees that, except for such other payments and benefits to which the Executive may be entitled as expressly provided by the terms of this Agreement
or any applicable benefit plan, such liquidated damages shall be in lieu of all other claims that the Executive may make by reason of termination of his employment or any such breach of this Agreement and that, as a condition to receiving payments
during the Severance Period, the Executive will execute a release of claims in a form reasonably satisfactory to the Company. 
 11.
Compliance Agreement. As a pre-condition to the effectiveness of this Agreement, the Executive agrees to execute and deliver the Compliance Agreement attached hereto as Exhibit B (the “Compliance Agreement”), the terms
and conditions of which are specifically incorporated herein by reference. The obligation of the Company to make payments to or on behalf of the Executive under Section 10 .3(ii) above is expressly conditioned upon the Executive’s
continued performance of the Executive’s obligations under the Compliance Agreement. 
 12. Enforcement. It is the desire and
intent of the parties hereto that the provisions of this Agreement will be enforced to the fullest extent permissible under the laws and public policies applied in each jurisdiction in which enforcement is sought. Accordingly, to the extent that a
restriction contained in this Agreement is more restrictive than permitted by the laws of any jurisdiction whose law may be deemed to govern the review and interpretation of this Agreement, the terms of such restriction, for the purpose only of the
operation of such restriction in such jurisdiction, will be the maximum restriction allowed by the laws of such jurisdiction and such restriction will be deemed to have been revised accordingly herein. A court having jurisdiction over an action
arising out of or seeking enforcement of any restriction contained in this Agreement may modify the terms of such restriction in accordance with this Section 12. 

  
 - 5 - 

 13. Notices. All notices, demands and other communications which are required to be given,
served or sent pursuant to this Agreement will be in writing and will be delivered personally or sent by air courier or first class certified or registered mail, return receipt requested and postage prepaid, addressed as follows: 

If to the Executive: 
 John
Magnani, Ph.D. 
 325 West Side Drive, Apartment 101 

Gaithersburg, MD 20878 
 If to
the Company: 
 GlycoMimetics, Inc. 

14915 Broschart Road, Suite 200 

Rockville, MD 20850 
 Attention:
Chairman of the Board 
 All notices and other communications given to any party hereto in accordance with the provisions of this Agreement will be deemed
to have been given on the date of delivery if personally delivered; on the business day after the date when sent if sent by air courier or other guaranteed delivery service; and on the third business day after the date when sent if sent by mail, in
each case addressed to such party as provided in this Section 13 or in accordance with the latest unrevoked direction from such party. 

14. Binding Agreement; Benefit. The provisions of this Agreement will be binding upon and will inure to the benefit of, the respective
heirs, legal representatives and successors of the parties hereto. 
 15. Governing Law. This Agreement will be governed by, and
construed and enforced in accordance with, the laws of the State of Maryland without giving effect to its principals or rules of conflict laws to the extent such principles or rules would require or permit the application of the laws of another
jurisdiction. 
 16. Waiver of Breach. The waiver by either party of a breach of any provision of this Agreement by the other party
must be in writing and will not operate or be construed as a waiver of any subsequent breach by such other party. 
 17. Entire
Agreement: Amendments. This Agreement contains the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior agreements or understanding among the parties with respect thereto. This Agreement may be
amended only by an agreement in writing signed by the parties hereto. 
 18. Headings. The Section headings contained in this
Agreement are for reference purposes only and will not affect in any way the meaning or interpretation of this Agreement. 
 19.
Severability. Subject to the provisions of Section 12 above, any provision of this Agreement that is prohibited or unenforceable in any jurisdiction will, as to such jurisdiction, be ineffective to the extent of such prohibition
or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction will not invalidate or render unenforceable such provision in any other jurisdiction. 

20. Assignment. This Agreement is personal in its nature and the parties hereto shall not, without the consent of the other party
hereto, assign or transfer this Agreement or any rights or obligations 

  
 - 6 - 

 
hereunder, provided, however, that the rights and obligations of the Company hereunder shall be assignable and delegable in connection with any subsequent merger, consolidation,
sale of all or substantially all of the assets or stock of the Company or similar transaction involving the Company or a successor corporation; and provided, further, that Administaff may assign all provisions relating to Administaff
hereunder or under the Service Agreement at any time to the Company, and on such an assignment, will have no obligations to the Executive hereunder. 

21. Confidentiality. The Executive agrees not to disclose this Agreement or its terms to any person or entity, other than the
Executive’s agents, advisors or representatives, except as consented to by Administaff and the Company in writing or as may be required by law. 

22. Further Assurances. The Executive agrees to execute, acknowledge, seal and deliver such further assurances, documents,
applications, agreements and instruments, and to take such further actions, as the Company may reasonably request in order to accomplish the purposes of this Agreement. 

23. Guarantee. During the term of the Service Agreement, certain of the benefits owing to the Executive hereunder will be provided by
Administaff in accordance with the Service Agreement. The Company guarantees the performance by Administaff of its obligation to provide such benefits, which guarantee is unconditional and is not conditioned or contingent upon any attempt to enforce
such obligations against Administaff. In the event that the Service Agreement is terminated for any reason, the rights and obligations of the Company and the Executive hereunder shall continue, and in such event, all references herein to Administaff
shall be deemed references to the Company. 
 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK] 

  
 - 7 - 

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

					
	COMPANY:
	
	GLYCOMIMETICS, INC.
		
	By:	 	 /s/ Rachel King

		 	Name:	 	Rachel King
		 	Title:	 	President and Chief Executive Officer
	
	EXECUTIVE:
	
	 /s/ John Magnani

	John Magnani, Ph.D.

  
 - 8 -

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