Employee Leveraged Restricted Stock Unit Agreement

a.Grant. IDEXX Laboratories, Inc., a Delaware corporation (the “Company”), hereby grants to the Participant a Restricted Stock Unit Award consisting of the number of Restricted Stock Units (“RSUs”) stated in this Restricted Stock Unit Agreement, including any grant notice, exhibit, appendix or addendum hereto (this “Agreement”). Each RSU represents the right to receive one share of common stock, $0.10 par value, of the Company (individually a “Share” and collectively the “Shares”). The Company will record the grant of the RSUs based on the maximum number of Shares that may be issued to the Participant pursuant to this Agreement for purposes of calculating the number of Shares remaining available for grant under the Plan and will issue Shares upon vesting of the RSUs as provided below. This award of RSUs is subject to the terms and conditions set forth in this Agreement, the Company’s 2018 Stock Incentive Plan (the “Plan”) and the description of the Plan set forth in the Plan Prospectus. The Plan and the Plan Prospectus are provided to the Participant with this Agreement. Capitalized terms not otherwise defined in this Agreement shall have the meanings set forth in the Plan or the Plan Prospectus.

b.Restrictive Covenant Agreements. Participant acknowledges and affirms that: (i) Participant is subject to non-competition, non-solicitation and/or confidentiality provisions set forth in one or more agreements with the Company or any of its Affiliates (including, as applicable, employment, consulting or advisory contracts; confidentiality and nondisclosure agreements; or other agreements; in each case as may be amended, supplemented or replaced from time to time) (collectively, the “Restrictive Covenant Agreements”); (ii) this RSU award is granted in consideration of Participant’s agreement to be bound by the Participant’s Restrictive Covenant Agreements; (iii) if the Company requests that Participant execute updated Restrictive Covenant Agreements, the vesting of this RSU award is conditioned on Participant’s execution and delivery of such updated Restrictive Covenant Agreements in a manner and by a date satisfactory to the Company in its sole discretion, and the failure of Participant to so execute and deliver any such requested updated Restrictive Covenant Agreement by such date will result in the immediate cancellation of, and automatic forfeiture of any rights Participant may have with respect to, this RSU award; and (iv) Participant agrees to comply with the restrictions and obligations set forth in Participant’s Restrictive Covenant Agreements.

a.Vesting. Subject to Sections 2(b), (c), (d), (e) and (f), the Certified RSUs shall vest and become nonforfeitable on the later to occur of (i) the Certification Date and

(ii) the third anniversary of the grant date of this award (such date, the “Vesting Date”).

b.Forfeiture. Any RSUs that are not determined eligible to vest on or prior to the Certification Date will be forfeited, and the Participant will have no future rights with respect to any such unvested RSUs. Except as otherwise provided in this Section 2, in the event that the Participant ceases to be employed by the Company or an Affiliate or a member of the Board, as applicable (an “Eligible Grantee”), for any reason or no reason prior to the Vesting Date, all of the RSUs will be forfeited, and the Participant will have no future rights with respect to any such unvested RSUs. The Company shall determine in good faith (including in accordance with Section 409A of the Code) and in the exercise of its discretion whether the Participant has ceased to be an employee and the effective date of the Participant’s termination of such status, and such determinations shall be final, binding and conclusive.

c.Disability or Death. In the event that the Participant’s employment or service to the Company or an Affiliate is terminated as a result of the Participant’s Disability (as defined in Section 22(e)(3) of the Code) or as a result of the Participant’s death, (i) 100% of the target number of RSUs set forth on the grant notice (the “Target Amount”) shall immediately vest and become nonforfeitable as of the date of the Participant’s Disability or death, provided, however, if such Disability or death occurs within one year of the grant date of this award, then this award shall continue to vest after the date of such Disability or death in accordance with the schedule described herein, except that the Target Amount will vest and become nonforfeitable as of the date that is the one-year anniversary of the grant date of this award, and (ii) any RSUs in excess of the Target Amount will be forfeited and the Participant will have no future rights with respect to such excess RSUs as of the date of such termination.

d.Retirement.

Participant has been an employee of the Company or its Affiliate for at least 10 years as of the date of the Participant’s termination date, not including any years during which the Participant was employed by a company that was acquired by or merged with the Company, and provided further that the Participant shall be eligible to retire under the terms of this Agreement if the Participant has provided the Company written notice of such retirement in the form required by the Company at least six months prior to the Participant’s anticipated termination date due to retirement. Notwithstanding anything herein to the contrary, any of the Chief Executive Officer, the Chief Human Resources Officer or the General Counsel of the Company may waive at any time the requirement that the Participant provide at least six-months’ prior written notice of retirement in a form required by the Company to be eligible to retire under the terms of this Agreement, unless the Participant is an officer (within the meaning of Rule 3b-7 under the Exchange Act) of the Company, or otherwise reports directly to the Chief Executive Officer of the Company; only the Board or the Compensation Committee of the Board may grant such a waiver to the Participant if the Participant is an officer of the Company or a direct report of the Chief Executive Officer at the time of such waiver.

ii.Notwithstanding the foregoing, in the event that the Participant’s employment is terminated as a result of retirement on or after the first anniversary of the grant date and, after such retirement, the Participant dies or becomes Disabled before the Vesting Date, then (A) the Target Amount shall immediately vest and become nonforfeitable as of the date of the Participant’s Disability or death and (B) a number of RSUs equal to the amount (if any) by which the Retirement Amount exceeds the Target Amount shall vest and become nonforfeitable as of the Vesting Date. Any RSUs that do not vest pursuant to the foregoing will be forfeited as of the Vesting Date, and the Participant will have no future rights with respect to any such RSUs.

e.Change in Control. Notwithstanding the foregoing or anything to the contrary in the Plan or any employment (or similar) agreement by and between the Company and the Participant entered into prior to the grant date of this award, the following vesting and forfeiture provisions shall apply in the event this award remains outstanding and unvested immediately prior to a Change in Control:

i.The number of RSUs that are eligible to vest in connection with a Change in Control will equal the Target Amount (such RSUs, “CIC Units”). Any RSUs that are not CIC Units (including the additional RSUs eligible to vest pursuant to Section 2(d)(ii)(B) above) will be forfeited, and the Participant will have no future rights with respect to any such RSUs.

ii.If the acquiring or succeeding entity assumes or substitutes this award in connection with the Change in Control, (A) 25% of the CIC Units (rounded to the nearest whole number) will vest immediately prior to the Change

in Control, subject to the Participant remaining an Eligible Grantee through the effective date of the Change in Control, and (B) the remaining CIC Units will vest on third anniversary of the grant date of this award, subject to the Participant remaining an Eligible Grantee through such date. If the acquiring or succeeding entity does not assume or substitute this award in connection with the Change in Control, the CIC Units will vest immediately prior to such Change in Control. This award will be considered assumed or substituted if, following the Change in Control, this award confers the right to receive, for each Share subject to the CIC Units, the consideration (whether stock, cash or other securities or property) received in the transaction by holders of Shares for each Share held on the effective date of the transaction (and if holders were offered a choice of consideration, the type of consideration chosen by the holders of a majority of the outstanding Shares); provided, however, that if such consideration received in the transaction is not solely common stock of the acquiring or succeeding entity, the Board may, with the consent of the acquiring or succeeding entity, provide that the consideration to be received upon vesting of the CIC Units will be solely common stock of the acquiring or succeeding entity substantially equal in fair market value to the per-share consideration received by holders of Shares in the transaction. The determination of such substantial equality of value of consideration shall be made by the Board in its sole discretion and its determination shall be conclusive and binding.

iii.Notwithstanding the foregoing, if the Participant’s employment or service is terminated by the Company (or the acquiring or succeeding entity) other than for Cause or by the Participant for Good Reason (if such term is defined in an employment (or similar) agreement by and between the Company (the acquiring or succeeding entity) and the Participant), in either case, as of or following the occurrence of a Change in Control, then 100% of the CIC Units that remain outstanding and unvested will immediately vest on the date of such termination.

iv.Notwithstanding the foregoing, if the Participant’s employment or service is terminated as a result of the Participant’s retirement on or after the first anniversary of the grant date of this award, then (A) 100% of the CIC Units that remain outstanding and unvested will immediately vest on the retirement date if such date occurs on or after consummation of the Change in Control, and (B) 100% of the CIC Units will vest immediately prior to consummation of the Change in Control if the Participant’s retirement date occurred prior to consummation of the Change in Control; provided, that, in either case, the number of CIC Units eligible to vest will be prorated by multiplying the Target Amount by a fraction (the numerator of which equals the sum of (I) number of complete and partial calendar months of continuous service provided by the Participant to the Company (or the acquiring or succeeding entity) from the grant date through the retirement date plus (II) an additional 12 months, and the denominator of which equals 36, provided, that in no event will such

fraction result in a payout that exceeds 100% of the CIC Units) and the resulting prorated number of CIC Units will be rounded to the nearest whole number.

f.Restrictive Covenant Violations. Notwithstanding anything in this Agreement that may be to the contrary, if the Company determines that Participant has violated any provisions set forth in the Restrictive Covenant Agreements, in addition to any and all rights and remedies set forth therein or otherwise available under law or equity, Participant covenants and agrees that: (i) the unvested portion of the RSUs will immediately be cancelled, and Participant shall automatically forfeit any rights Participant may have with respect to such unvested RSUs as of the date of such determination; and (ii) the Company or its Affiliates may also take action at equity or in law to enforce the provisions of the Restrictive Covenant Agreements. Following application of this provision of the Agreement, Participant will continue to be bound by the obligations, promises and other agreements contained in the Restrictive Covenant Agreements and this Agreement.

3.Restrictions on Transfer.

4.Rights as Stockholder.

5.Delivery of Shares; Compliance with Securities Laws, Etc.

a.General. The Company shall, upon (and in no event more than 90 days after) vesting of RSUs hereunder, make prompt delivery of vested Shares to the Participant, or if the Participant has died or become Disabled (as defined in Section 2(c) above), to the person to whom this award is transferred by will or the laws of descent and distribution, provided that if any law or regulation requires the Company to take any action with respect to such Shares before the issuance thereof, then the date of delivery of such Shares shall be extended for the period necessary to complete such action.

b.Listing, Qualification, Etc. The RSUs shall be subject to the requirement that if, at any time, counsel to the Company shall determine that the listing, registration or qualification of Shares subject hereto upon any securities exchange or under any state, federal or foreign law, or the consent or approval of any governmental or

regulatory body, or that the disclosure of non-public information or the satisfaction of any other condition is necessary as a condition of, or in connection with, the issuance of Shares hereunder, then such issuance shall be deferred until such listing, registration, qualification, consent or approval, disclosure or satisfaction of such other condition shall have been effected or obtained on terms acceptable to the Board. Nothing herein shall be deemed to require the Company to apply for, effect disclosure, or to satisfy such other condition.

6.No Special Employment Rights.

7.Taxes.

a.Responsibility for Taxes. The Participant acknowledges that, regardless of any action taken by the Company or, if different, the Participant's employer (the "Employer”), the ultimate liability for all income tax (whether foreign, federal, state or local), social insurance, payroll tax, fringe benefits tax, payment on account and other tax-related items related to the Participant’s participation in the Plan and legally applicable to the Participant (the “Tax-Related Items”) is and remains the Participant’s responsibility as it may come due and may exceed the amount actually withheld by the Company or the Employer. The Participant further acknowledges that the Company and/or the Employer (i) make no representations or undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of the RSUs, and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the RSUs to reduce or eliminate the Participant’s liability for Tax-Related Items or achieve any particular tax result. Further, if the Participant is subject to Tax-Related Items in more than one jurisdiction, the Participant acknowledges that the Company and/or the Employer (or former employer, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction. In addition, the Participant further acknowledges that Tax-Related Items may be incurred at different times.

b.Withholding. The Participant acknowledges and agrees to make arrangements satisfactory to the Company with respect to any withholding obligation the Company or the Employer (or former employer) may have for Tax-Related Items. Without limitation to the foregoing, the Participant acknowledges and agrees that to satisfy any such withholding obligation for Tax-Related Items, the Company may (i) deduct and retain from the Shares to be distributed upon vesting of RSUs such number of Shares as is equal in value to the Tax-Related

Items, (ii) withhold from the Participant's wages or other cash compensation paid to the Participant by the Company and/or the Employer, (iii) withhold from proceeds of the sale of Shares acquired upon vesting and settlement of the RSUs, either through a voluntary sale or through a mandatory sale arranged by the Company (on the Participant’s behalf pursuant to this authorization), or (iv) withhold by any other method permitted under the Plan and applicable law.

Depending on the withholding method, the Company may withhold or account for Tax-Related Items by considering applicable minimum statutory withholding amounts or other applicable withholding rates, including up to the maximum applicable rate in the Participant's jurisdiction (in which case, the Participant may receive a refund of any over-withheld amount in cash and will have no entitlement to the equivalent amount in Shares). If the obligation for Tax-Related Items is satisfied by withholding in Shares, as described in (i) above, for tax purposes, the Participant will be deemed to have been issued the full number of Shares subject to the vested portion of the RSUs. The Company may refuse to issue or deliver the Shares or the proceeds of the sale of Shares, if the Participant fails to comply with his or her obligations in connection with the Tax-Related Items.

c.Section 409A. The RSUs are intended to comply with Section 409A of the Code and, accordingly, to the maximum extent permitted, this Agreement shall be interpreted to be in compliance therewith. Nothing contained herein shall constitute any representation or warranty by the Company regarding compliance with Section 409A of the Code. The Company shall have no obligation to take any action to prevent the assessment of any additional income tax, interest or penalties under Section 409A of the Code on any Person and the Company and its Affiliates, and each of their respective employees and representatives, shall have no liability to the Participant with respect thereto. Notwithstanding anything to the contrary in this Agreement or the Plan, solely for purposes of amounts payable under this Agreement that are deemed to be “nonqualified deferred compensation” under Section 409A of the Code, (i) if the definition of Change in Control is required to comply with the requirements of Section 409A of the Code in order for the RSUs to comply with Section 409A of the Code, then no transaction otherwise constituting a Change in Control, as defined in the Plan, will be considered a Change in Control for such purposes unless it also qualifies as a “change in control event” within the meaning of Treasury Regulation Section 1.409A-3(i)(5)(i); and (ii) if the Participant is a “specified employee” for purposes of Section 409A of the Code at the time of his or her “separation from service” (within the meaning of Section 409A of the Code), delivery of shares in respect of any RSU that vests and becomes payable upon or in connection with the Participant’s separation from service shall be delayed and will be payable on the day after the first to occur of (a) the day which is six (6) months following the date of such separation from service, and (b) the date of the Participant’s death or Disability (as defined above).

d.Tax Consequences. The Participant has reviewed with his or her own tax advisors the applicable tax consequences of this investment and the transactions contemplated by this Agreement. With respect to such matters, the Participant

relies solely on such advisors and not on any statements or representations of the Company or any of its agents, written or oral.

8.Data Privacy.

The Participant understands that the Company and the Employer may hold certain personal information about the Participant, including, but not limited to, the Participant’s name, home address, email address and telephone number, date of birth, social insurance number, passport or other identification number, salary, nationality, job title, any shares of stock or directorships held in the Company, details of all RSUs or any other entitlement to shares of stock awarded, canceled, exercised, vested, unvested or outstanding in the Participant’s favor (“Data”), for the exclusive purpose of implementing, administering and managing the Plan.

The Participant understands that Data will be transferred to E*TRADE or such other stock plan service provider as may be selected by the Company in the future, which is assisting the Company with the implementation, administration and management of the Plan. The Participant understands that the recipients of the Data may be located in the United States or elsewhere, and that the recipient’s country may have different data privacy laws and protections than the Participant’s country.

The Participant authorizes the Company, E*TRADE and any other possible recipients which may assist the Company (presently or in the future) with implementing, administering and managing the Plan to receive, possess, use, retain and transfer the Data, in electronic or other form, for the sole purposes of implementing, administering and managing the Participant’s participation in the Plan.

9.Clawback/Recoupment. Notwithstanding any other provisions in this Agreement or any other agreement between the Company and the Participant to the contrary, this Agreement, the RSUs granted hereunder, the shares distributed in settlement of such RSUs and/or the gains realized upon a subsequent sale of such shares by the Participant shall be subject to repayment or forfeiture by the Participant to the Company in accordance with the terms and conditions of the Company’s Amended & Restated Clawback Policy or any other “clawback” or mandatory recoupment policy adopted by the Company from time to time.

10.Miscellaneous.

b.Except as provided herein, this Agreement may not be amended or otherwise modified unless evidenced in writing and signed by the Company and the Participant. Any provision for the benefit of the Company contained in this Agreement may be waived, either generally or in any particular instance, by the Board. The Board may amend, alter, suspend, discontinue or terminate the Plan, or any portion thereof, at any time, subject to the requirements for certain amendments or alterations set forth in the Plan.

c.This Agreement shall be binding upon and inure to the benefit of the Company and the Participant and their respective heirs, executors, administrators, representatives, successors and assigns, subject to the restrictions on transfer set forth in Section 3 hereof.

d.The right of the Participant to receive Shares pursuant to this award is an unfunded and unsecured obligation of the Company. The Participant shall have no rights under this award other than those of an unsecured general creditor of the Company.

e.The RSUs and the provisions of this Agreement shall be governed by and construed in accordance with the laws of the State of Delaware and applicable federal law, without regard to applicable conflict of laws principles.

f.The invalidity or unenforceability of any provision of this Agreement shall not affect the validity or enforceability of any other provision of this Agreement, and each other provision of this Agreement shall be severable and enforceable to the extent permitted by law.

g.The Company is not providing any tax, legal or financial advice, nor is the Company making any recommendations regarding the Participant’s participation in the Plan, or the Participant’s acquisition or sale of the underlying Shares.

h.All notices under this Agreement shall be mailed or delivered by hand to the parties at their respective addresses set forth in this Agreement or at such other address as may be designated in writing by either of the parties to one another.

i.The Company may, in its sole discretion, decide to deliver any documents related to current or future participation in the Plan by electronic means. The Participant hereby consents to receive such documents by electronic delivery and agrees to participate in the Plan through an on-line or electronic system established and maintained by the Company or a third party designated by the Company.

j.If the Participant works and/or resides outside the United States, the RSUs and any Shares subject to the RSUs shall be subject to any special terms and conditions set forth in Exhibit A. Moreover, if the Participant relocates outside of the United States and to one of the countries included in Exhibit A, the special terms and conditions for such country will apply to Participant to the extent the Company determines that the application of such terms and conditions is necessary or advisable for legal or administrative reasons. Exhibit A constitutes part of this Agreement.

k.The Company reserves the right to impose other requirements on the Participant’s participation in the Plan, on the RSUs and on any Shares acquired

under the Plan, to the extent the Company determines it is necessary or advisable for legal or administrative reasons, and to require the Participant to sign any additional agreements or undertakings that may be necessary to accomplish the foregoing.