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EXHIBIT 10.3

Lantheus Holdings, Inc. Amended and Restated 2026 Equity Incentive Plan

RestrictedStock Unit Award Agreement

(RelativeTotalShareholderReturnPerformance-BasedVesting)

This Restricted Stock Unit Award Agreement including Exhibit Ahereto (this“Agreement”)ismadeby andbetweenLantheusHoldings,Inc., aDelawarecorporation(the “Company”), and #ParticipantName#(the“Participant”),effectiveasof #GrantDate#(the“DateofGrant”).

RECITALS

WHEREAS,theCompanyhasadoptedtheAmended and Restated LantheusHoldings,Inc.2026Equity IncentivePlan(asthesamemaybeamendedand/oramendedandrestatedfromtimetotime,the “Plan”),whichPlanisincorporatedhereinbyreferenceandmadeapartofthisAgreement,and capitalizedtermsnototherwisedefinedinthisAgreementwillhavethemeaningsascribedtothose terms in the Plan; and

WHEREAS,theCommitteehasauthorizedandapprovedthegrantofanAwardto theParticipantofRestrictedStockUnits,subjecttothetermsandconditionssetforthinthePlan and this Agreement.

NOWTHEREFORE,inconsiderationofthepremisesandthemutualcovenants set forth in this Agreement, the parties agreeas follows:

1.

Grant of Performance-Based RSUs.TheCompanyhasgrantedtotheParticipant,effective asoftheDateofGrant,performance-basedRestrictedStockUnits(the“RSUs”),giving the Participant the conditionalright to receive, on the termsand conditions set forth in the PlanandthisAgreement,oneshareofCommonStockwithrespecttoeachRSUsubjectto thisAward.SubjecttoadjustmentassetforthinthePlan,thetargetnumberofRSUs subjecttothisAwardis#QuantityGranted#(“TargetRSUs”)andthemaximumnumberof RSUs subject to this Award is 200% of the Target RSUs.

2.

Vesting of RSUs.

(a)

General.Subjecttothe terms and conditions set forth in the Plan and this Agreement,alloraportionoftheRSUssubjecttothisAwardwillvest,ifatall,on thethird(3rd)anniversaryoftheDateofGrant(the“CliffVestingDate”),tothe extentearnedbasedontheachievementoftheperformancecriteriasetforthon ExhibitA(the“PerformanceCriteria”),and,exceptasotherwiseprovidedin Section 2(b) or Section2(c)below,subjecttotheParticipant’scontinuedService

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through the CliffVestingDate.Thenumberof RSUsthatareearnedbasedon the achievementofthePerformanceCriteriaandareeligibletovesthereunderare referredtointhisAgreementasthe“EarnedRSUs.”

(b)

Qualified Retirement. Notwithstanding Section 2(a) and Section 3 of the Agreement, in the case of a Participant whose Service terminates due to a Qualified Retirement (as defined below) (a “Qualified Retiree”), the Participant’sRSUs and Dividend Equivalents (as defined below) will continue to vest (subject to pro-ration as provided in Exhibit A(Determinations)), except as specifically provided in Section 2(c), until the earlier of (a) the Cliff Vesting Date and (b) the date on which the Participant violates any restrictive covenant or other continuing obligation to the Company on or after the Participant’s Qualified Retirement Date (as defined below) (the “Qualified Retirement Vesting Period”). Upon the expiration of the Qualified Retirement Vesting Period, any unvested RSUs or Dividend Equivalents will be immediately and automatically forfeited without consideration in the manner contemplated in Section 3. As used herein, “Qualified Retirement” means that, (x) as of the date Participant ceases to provide Services to the Company due to voluntary retirement (and not a termination by the Company with or without Cause) (the “Qualified Retirement Date”), (i) Participant is at least fifty-five (55) years of age and (ii) Participant has provided Services to the Company or any Subsidiary for at least ten (10) years; and (y) if such Participant isnota Qualified Officer (as defined below), Participant provides written notice to the Company of his or her plan to cease providing Services to the Company at least six (6) months’ prior to Participant’s Qualified Retirement Date. For purposes of this Section 2(b) each of the following individuals is a Qualified Officer: (i) the Company’s principal executive officer, president, principal financial officer, principal operating officer, principal accounting officer or person performing similar functions and (ii) each named executive officer for whom disclosure was required pursuant to Item 402(c) of Regulation S-K (17 CFR 229.402(c)) in the Company’s most recent proxy statement or other filing with the Securities and Exchange Commission (“SEC”). For clarity, if Participant’s status as a Qualified Officer ceases prior to Participant’s Qualified Retirement Date, Participant shall promptly provide the Company with notice of retirement as provided in this Section 2(b).

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(c)

Change in Control.IntheeventofaChangeinControl,subjecttotheParticipant’s continued Service through the dateofaChangeinControl (except as otherwise provided in Sections 2(c)(ii), (iv), (v) and (vii)):

(i)

Except in the case of a Qualified Retiree, if,priortothePerformancePeriodEndDate(asdefinedinExhibitA),a ChangeinControloccurs,totheextenttheRSUshavenotbeenforfeited under Section 3 below prior to that Change in Control, then the Committee willdeterminetheextenttowhichthePerformanceCriteriahasbeen achievedasofthedateofthatChangeinControlasifthePerformance PeriodEndDatewerethedateofthatChangeinControlandwilldetermine the number of Earned RSUs, if any.

(ii)

In the case of a Qualified Retiree, in the event of a Change in Control during the Qualified Retirement Vesting Periodbut prior to the Performance Period End Date (as defined in Exhibit A), to the extent RSUs have not been forfeited under Section 3 below prior to the Change in Control, then the Committee willdeterminetheextenttowhichthePerformanceCriteria for such RSUshasbeen achievedasofthedateofthatChangeinControlasifthePerformance PeriodEndDatewerethedateofthatChangeinControlandwilldetermine the number of Earned RSUs, if any, subject to the pro-ration provided in Exhibit A(Determinations).

(iii)

Except in the case of a Qualified Retiree or asotherwiseprovided in Sections 2(c)(iv) through 2(c)(viii),the numberofEarnedRSUs,ifany,willcontinuetovestbasedsolelyontime andwillvestinfullontheCliffVestingDate,subjecttotheParticipant’s continued Service through the Cliff Vesting Date.

(iv)

Except in the case of a Qualified Retiree, if,(A)inconnectionwithaChangeinControldescribedinsubsection(i) above,theEarnedRSUsareassumedorcontinued,oranewawardis substitutedfortheEarnedRSUsbythesurvivingcompanyoritsparentin accordancewiththeprovisionsofSection12ofthePlan,(B)theParticipant remainsincontinuedServicethroughthedateofthatChangeinControl and,(C)withinthetwelve(12) monthperiodfollowingthedateofthat ChangeinControlandpriortotheCliffVestingDate,theParticipant’s ServiceisterminatedbytheCompanywithoutCauseor,iftheParticipant ispartytoaneffectiveemploymentletteroragreementwiththeCompany oranySubsidiarythatdefines “GoodReason”(oranysimilarterm), by the ParticipantforGoodReason,thentheEarnedRSUs(orthenewaward substitutedfortheEarnedRSUs)willvestinfull upon such termination of Service.

(v)

In the case of a Qualified Retiree, if, (A) in connection with a Change in Control described in subsection (ii) above, the Earned RSUs are assumed or continued, or a new award is substituted for the Earned RSUs by the surviving company or its parent in accordance with the provisions of Section 12 of the Plan, then the Earned RSUs (or the new award substituted

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for the Earned RSUs)will continue to vest through the Cliff Vesting Date, subject to pro-ration as provided in Exhibit A (Determinations).

(vi)

Except in the case of a Qualified Retiree, if,inconnectionwithaChangeinControldescribedinsubsection(i)above, theEarnedRSUsarenotassumedorcontinued,oranewawardisnot substitutedfortheEarnedRSUsbythesurvivingcompanyoritsparentin accordancewiththeprovisionsofSection12ofthePlan,thentheEarned RSUswill vest in full as of immediately prior to the Change in Control.

(vii)

In the case of a Qualified Retiree, if, in connection with a Change in Control described in subsection (ii) above, the Earned RSUs are not assumed or continued, or a new award is not substituted for the Earned RSUs by the surviving company or its parent in accordance with the provisions of Section 12 of the Plan, then the Earned RSUs will vest in full as of immediately prior to the Change in Control, subject to pro-ration as provided in Exhibit A(Determinations).

(viii)

IfaChangeinControloccursfollowingthePerformancePeriodEndDate butonorbeforetheCliffVestingDate,thentheEarnedRSUs,totheextent theyhavenotbeenforfeitedunderSection3belowasofimmediatelyprior totheChangeinControl,willvestinfullasofimmediatelypriortosuch Change in Control, subject, in the case RSUs earned by a Qualified Retiree, to pro-ration as provided in Exhibit A(Determinations).

3.

Forfeiture.ExceptassetforthinSection2(b) and Section 2(c)above,allunvestedRSUsandDividend Equivalents(whetherornotearned)willbeforfeited, automaticallyandwithoutconsiderationimmediately upon (a)terminationoftheParticipant’sServicefor anyreason other than a Qualified RetirementpriortotheCliffVestingDate and, (b) in the case of a Qualified Retiree, expiration of the Qualified Retirement Vesting Period prior to the Cliff Vesting Date.AllsharesofCommonStockreceivedinrespectof theRSUsandanyDividendEquivalents(andresultingproceedsthereof)areandwillcontinue tobesubjecttoSection13ofthePlan,regardlessofwhetheraterminationoftheParticipant’s Service hasoccurred.

4.

Adjustments.IntheeventofanychangewithrespecttotheoutstandingsharesofCommon StockcontemplatedbySection4.4ofthePlan,thisAwardmaybeadjustedinaccordancewith Section4.4ofthePlan.

5.

Deliveryof Sharesand Dividend Equivalents.TheCompanywill,assoonaspracticable followingthevestingofanyRSUssubject to this Award (but innoeventlaterthanthirty(30) daysfollowingthedateonwhichsuchRSUsvest),effectdeliveryofsharesofCommonStock withrespecttosuchvestedRSUs(andanyDividendEquivalentscreditedwithrespecttosuch RSUspayableinCommonStockor,withrespecttoDividendEquivalentscreditedwithrespect tosuchRSUspayableincash,makeacashpaymentinrespectthereof)totheParticipant(or, in the event of the Participant’sdeath,tothepersondescribed in Section 15.3 of the Plan).

6.

TaxWithholding.The Participant expressly acknowledges and agrees that the Participant’s rights hereunder, including the right to be issued shares of Common Stock upon the vesting of

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the Award (or any portion thereof), are subject to the prompt payment by the Participant to the Company in cash (or by such other means as may be acceptable to the Committee in its discretion) of all taxes required to be withheld, if any, relating to the Award. The Company will automatically satisfyanyfederal,state,localorforeignwithholdingtaxobligations thatmayariseinconnectionwiththeRSUsandanyDividendEquivalents,as follows:

(a)

withrespecttotheRSUsandanyDividendEquivalentspayableinsharesof CommonStock,bywithholdingfromthesharesofCommonStock otherwisedeliverableinconnectionwiththatvestingdate,anumberofsharesof CommonStockhavingaFairMarketValueequaltotheminimumstatutoryamount requiredtobewithheldtosatisfysuchthosewithholdingobligations(oranyhigher amountproperlyandtimelyspecifiedbytheParticipant);provided, however, that with the prior approval of the Committee, the Company may require the Participant to satisfy all tax withholding obligations by causingthat numberofsharesofCommonStocktobesoldinaccordancewitha10b5-1 trading plan or under anothersell-to-cover arrangement;and

(b)

withrespecttoanyDividendEquivalentspayableincash,bywithholdingan amountincashfromsuchDividendEquivalentsequaltotheminimumstatutory amount required tobewithheld tosatisfysuchtaxwithholdingobligations (orany higher amount properly and timely specifiedbytheParticipant).

7.

Shareholder Rights.TheParticipantwillnothaveanyrightsofastockholderwithrespectto theRSUsunlessanduntilsharesofCommonStockareactuallydeliveredinrespectofthe RSUs;providedthattheParticipantwillbeentitledtoreceiveDividendEquivalentswithrespect to unvestedRSUsinaccordancewiththisSection7.Inconnectionwith(x)anyregular dividenddeclaredonsharesofCommonStockthatispayableincashor(y)anyregular dividenddeclaredonsharesofCommonStockthatispayableinsharesofCommonStock,for eachshareofCommonStockdeliverableinrespectofanunvestedRSU,theParticipantwill receiveadividendequivalent(a“DividendEquivalent”).AnysuchDividendEquivalentswill

entitletheParticipantto receive,subjecttothetermsofthisAgreement,a paymentofcashor issuanceofsharesofCommonStockequaltotheamountornumberofsharesthatthe ParticipantwouldhavereceivedasaregulardividendhadtheParticipantheldthesharesof CommonStockdeliverableinrespectofsuchunvestedRSUsatthetimesuchdividendwas paid.AnyDividendEquivalentswillbesubjecttothesamevestingandothertermsand conditionsastheunvestedRSUstowhichthey relateandwillbepaid, ifatall,incash,inthe caseofacashdividendorCommonStockinthecaseofadistributionofsharesofCommon Stock, in either case, inaccordancewith Section5 of this Agreement.

8.

Miscellaneous Provisions

(a)

Non-transferability.AnysharesofCommonStockdeliveredhereunderwillbe subjecttosuchstoptransferordersandotherrestrictionsastheCommitteemay deemadvisableunderthePlanortherules,regulationsandotherrequirementsof theSEC,anystockexchangeuponwhichsuch sharesarelisted,anyapplicablefederalorstatelaws,andanyagreementwith,or policyof,theCompanyortheCommitteetowhichtheParticipantisapartyor subject,andtheCommitteemaycauseordersordesignationstobeplaceduponany certificate(s)orother

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document(s)deliveredtotheParticipant,oronthebooksand recordsoftheCompany’stransferagent,tomakeappropriatereferencetosuch restrictions.

(b)

No Right to Continued Service.NothinginthisAgreementorthePlanconfers upontheParticipantanyrighttocontinueinServiceforanyperiodofspecific durationorinterfereswithorotherwiserestrictsinanywaytherightsofthe Company(oranySubsidiaryemployingorretainingtheParticipant)orofthe Participant,whichrightsareherebyexpressly reservedbyeach,toterminatehisor her Service at any time and forany reason, with or without Cause.

(c)

Entire Agreement.ThisAgreementandthePlanconstitutetheentireagreement betweenthepartiesheretowithregardtothesubjectmatterofthisAgreement.This AgreementandthePlansupersedeanyotheragreements,representationsor understandings(whetheroralorwrittenandwhetherexpressorimplied)thatrelate tothesubjectmatterofthisAgreement(includinganyletterorothernotice notifying the ParticipantofthisAward).

(d)

Waiver.NowaiverofanybreachorconditionofthisAgreementwillbedeemed tobeawaiverofanyotherorsubsequentbreachorconditionwhetheroflikeor different nature.

(e)

Successors and Assigns.TheprovisionsofthisAgreementwillinuretothebenefit of, and be binding upon, the Company and its successors and assignsanduponthe Participant,theParticipant’sexecutor,personalrepresentative(s),distributees, administrator,permittedtransferees,assignees,beneficiaries,andlegatee(s),as applicable,whetherornotanysuchpersonwillhavebecomeapartytothis Agreementandhaveagreedinwritingtobejoinedhereinandbeboundbythe terms hereof.

(f)

Severability.Theprovisions of this Agreement are severable and if any one or more provisions are determined to be illegal or otherwise unenforceable, in whole or in part, then the remaining provisions will nevertheless be binding and enforceable.

(g)

Amendment. Except as otherwise provided in the Plan, this Agreement will not be amended unless the amendment is agreed to in writing by both the Participant and the Company.

(h)

Choice of Law; Jurisdiction. This Agreement and all claims, causes of action or proceedings (whether in contract, in tort, at law or otherwise) that may be based upon, arise out of or relate to this Agreement will be governed by the internal laws of the State of Delaware, excluding any conflicts or choice-of-law rule or principle that might otherwise refer construction or interpretation of this Agreement to the substantive law of another jurisdiction. The Participant (or his or her beneficiary, legatee, executor, personal representative or distribute, as applicable) and the Company agree that he, she or it will bring all claims, causes of action and proceedings (whether in contract, in tort, at law or otherwise) that may be based upon, arise out of or be related to the Plan or this Agreement, exclusively in the Delaware Court of Chancery or, in the event (but only in the event) that such court

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does not have subject matter jurisdiction over such claim, cause of action or proceeding, exclusively in the United States District Court for the District of Delaware (either of the foregoing, the “Chosen Court”), and hereby (i) irrevocably submit to the exclusive jurisdiction of the Chosen Court, (ii) waive any objection to laying venue in any such proceeding in the Chosen Court, (iii) waive any objection that the Chosen Court is an inconvenient forum or does not have jurisdiction over any party and (iv) agree that service of process upon such party in any such claim or cause of action will be effective if notice is given in accordance with this Agreement.

(i)

Signature in Counterparts. This Agreement may be signed in counterparts, manually or electronically, and each of which will be an original, with the same effect as if the signatures to each were upon the same instrument.

(j)

Acceptance. The Participant hereby acknowledges receipt of a copy of the Plan and this Agreement. The Participant has read and understands the terms and provisions of the Plan and this Agreement, and accepts this Award subject to all of the terms and conditions of the Plan and this Agreement. In the event of a conflict between any term or provision contained in this Agreement and a term or provision of the Plan, the applicable term and provision of the Plan will govern and prevail.

INWITNESSWHEREOF,theCompanyandtheParticipanthaveexecutedthisAgreement asoftheDateofGrant.

Lantheus Holdings, Inc.

By:________________________________

Jamie Spaeth

Chief People Officer

Participant

#ParticipantName#

#AcceptanceDate#

#Signature

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EXHIBITA

ThisExhibit AdescribesthetermsandconditionsuponwhichtheRSUswillbecomeearnedand eligibletovestassetforthinSection2oftheRestrictedStockUnitAwardAgreementofwhich thisExhibit Aisapart(the“Agreement”).AllcapitalizedtermsusedinthisExhibit A,unless separately defined, have the meanings set forth in the Agreement.

1.

General.TheRSUswillbeeligibletobeearnedundertheAgreementsubjecttotheterms andconditionsofSection3ofthisExhibit AbasedontheTotalShareholderReturnofthe CompanyascomparedtotheTotalShareholderReturnoftheSpecifiedCompanies(as measuredbyrTSRPercentileRank). TotalShareholderReturn(asmeasuredbyrTSR Percentile Rank) will be the PerformanceCriteriaundertheAward.

2.

Definitions.Thetermssetforthbelow,asusedinthisExhibit A,willhavethefollowing meanings:

(a)

“PerformancePeriod”willmeantheperiodbeginningonthePerformancePeriod StartDateandendingon(i)thePerformancePeriodEndDate,or,ifearlier,(ii)the date on which a Change in Control is consummated.

(b)

“PerformancePeriodEndDate”willmeanDecember31,2028 (or, if earlier, the date on which a Change in Control is consummated).

(c)

“PerformancePeriodStartDate”willmeanJanuary1,2026.

(d)

“rTSRPercentileRank”willmeanthepercentageofTotalShareholderReturn values among the Specified Companies at the Performance PeriodEndDate(or,if earlier,thedateofaChangeinControl)thatareequaltoorlowerthanthe Company’sTotalShareholderReturnatthePerformancePeriodEndDate(or,if earlier,thedateofaChangeinControl),expressedasapercentageandcalculated asfollows:

rTSRPercentileRank=((N–R)/(N–1))*100 where:

“N”is the aggregate number of SpecifiedCompanies plus one (1);and

“R”isthenumberofSpecifiedCompanieswithaTotalShareholderReturn thatishigherthantheCompany’sTotalShareholderReturnatthe PerformancePeriodEndDate(or,ifearlier,thedateofaChangein Control) plusone(1).

(e)

“SpecifiedCompanies”willmeaneachofthecompaniesincludedintheS&P MidCap 400 Health Care Index as ofthePerformancePeriodStartDate,excludingtheCompanyitself. Ifacompanyin such index ceasestobepublicly

tradedduringthePerformancePeriod,orifitis publiclyannounced thatanysuchcompanywillbeacquired,whetherornotsuchacquisitionoccurs duringthePerformancePeriod,suchcompanywillnotbetreatedasaSpecified Companyforpurposesofthedeterminationshereinandsuchcompany’sTotal Shareholder Return will not be includedforpurposesofthecalculationsherein.

(f)

“TotalShareholderReturn”willmean,withrespecttoanycompany,thechangein valueexpressedasapercentageofagivendollaramountinvestedinacompany’s mostwidelypubliclytradedstockoverthePerformancePeriod,takingintoaccount bothstockpriceappreciation(ordepreciation)andthereinvestmentofdividends (includingthecashvalueofnon-cashdividends)insuchstockofthecompany.The thirty(30)trading-dayaverageclosingpriceofsharesofCommonStockandofthe mostwidelypubliclytradedstockoftheSpecifiedCompanies,asapplicable,

(i)

beginningonandincludingthePerformancePeriodStartDate,and(ii)except assetforthintheprovisobelow,endingonandincludingthePerformancePeriod EndDate,willbeusedtovaluesharesofCommonStockandsuchstockofthe SpecifiedCompanies,asapplicable;providedthat,intheeventthataChangeinControlisconsummatedduringthePerformancePeriod,thefairvalueoftheactual considerationreceivedbyholdersof CommonStockinthat ChangeinControl (as determinedbytheCommitteeinitssolediscretion)willbeusedincalculatingthe Company’s TotalShareholderReturninlieuofthethirty(30)trading-dayaverage closingpricedescribedinclause (ii)above.Dividendreinvestmentwillbe calculatedusingtheclosingpriceofashareofCommonStockorthestockofthe applicableSpecifiedCompany,asapplicable,ontheex-dividenddateor,ifno tradeswerereportedonsuchdate,thelatestprecedingdateforwhichatradewas reported.

3.

Earning of RSUs.NoRSUswillbecomeearnedunlesstherTSRPercentileRankisator abovethe25thpercentile.IftherTSRPercentileRankis equal tothe25thpercentile or 50thpercentile, or equal to or greater than the 75thpercentile,the aggregatenumberofRSUsthatwillbecomeearnedwillbeequaltotheTargetRSUs, multipliedbythe“ApplicablePercentage”setforthinthetablebelow.Intheeventthat rTSRPercentileRankfallsbetweenthe 25th and 50thpercentiles or the 50thand 75thpercentiles,the ApplicablePercentagewillbeinterpolatedonastraight-linebasisandthenumberofRSUs earned will be based on such interpolated percentage. Notwithstanding the foregoing, in the event the Company’s Total Shareholder Return is negative for the Performance Period, the Applicable Percentage of Target RSUs will be capped at 100%.

4.

Determinations. AttheendofthePerformancePeriod,theCommitteewilldeterminethe extenttowhich,ifany,thePerformanceCriteriahasbeenachievedandthenumberof RSUs that become Earned RSUs; provided, however, in the event of a Qualified Retirement, the Earned RSUs will be pro-rated by multiplying the Earned RSUs by an amount equal to the number of days Participant renders Services to the Company during the Performance Period, divided by the total number of days in the Performance Period. For clarity, in the case of a Change in Control under Section 2(c), when calculating pro-ration with respect to a Qualified Retiree, the Change in Control Date shall be deemed the end of the Performance Period.

AnyRSUsthatdonotbecomeEarnedRSUs(after determination and pro-ration) hereunder, andanyrelatedDividendEquivalents,willbeautomaticallyforfeited.NoRSUsorany relatedDividendEquivalentswillbeearnedand/orvestuntiltheCommitteecertifiesthe extenttowhichthePerformanceCriteriabeenachieved.TheCommitteewillmakesuch determinationandcertificationnotlaterthanMarch15thfollowingtheendofthe PerformancePeriod.EarnedRSUswillvestassetforthinSection2ofthisAgreement. AnyEarnedRSUswillberoundeddowntothenearestwholenumberofRSUsandany fractionalEarnedRSUswillbedisregarded.AlldeterminationsundertheAgreement, includingthisExhibit A,willbemadebytheCommitteeandwillbefinalandbindingon the Participant.