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    <link:label id="lab_ark_AutresProvisionsEtAutresPassifsNonCourants_documentation_fr" xlink:label="lab_ark_AutresProvisionsEtAutresPassifsNonCourants" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Autres Provisions Et Autres Passifs Non Courants</link:label>
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    <link:label id="lab_ark_AcquisitionCessionDactionsPropres_label_fr" xlink:label="lab_ark_AcquisitionCessionDactionsPropres" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="fr">Acquisition/Cession D'actions Propres</link:label>
    <link:label id="lab_ark_AcquisitionCessionDactionsPropres_documentation_fr" xlink:label="lab_ark_AcquisitionCessionDactionsPropres" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Acquisition/Cession D'actions Propres</link:label>
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    <link:label id="lab_ark_AttributionActionsPropresSalaries_documentation_fr" xlink:label="lab_ark_AttributionActionsPropresSalaries" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Attribution Actions Propres Salariés</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_AttributionActionsPropresSalaries" xlink:href="ark-2025-12-31.xsd#ark_AttributionActionsPropresSalaries"/>
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    <link:label id="lab_ark_InformationsRelativesAuxIndicateursAlternatifsDePerformanceEtInformationSectorielleTextBlock_documentation_fr" xlink:label="lab_ark_InformationsRelativesAuxIndicateursAlternatifsDePerformanceEtInformationSectorielleTextBlock" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Informations Relatives Aux Indicateurs Alternatifs De Performance Et Information Sectorielle</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_InformationsRelativesAuxIndicateursAlternatifsDePerformanceEtInformationSectorielleTextBlock" xlink:href="ark-2025-12-31.xsd#ark_InformationsRelativesAuxIndicateursAlternatifsDePerformanceEtInformationSectorielleTextBlock"/>
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    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_bceb7a7b-42b3-4a82-8859-d24b20016da9_totalLabel_fr" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="fr">Flux de trésorerie résultant (utilisés dans le cadre) d’activités de financement</link:label>
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    <link:label id="lab_ark_VariationDesFournisseursDImmobilisations_documentation_fr" xlink:label="lab_ark_VariationDesFournisseursDImmobilisations" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Variation Des Fournisseurs D'Immobilisations</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_VariationDesFournisseursDImmobilisations" xlink:href="ark-2025-12-31.xsd#ark_VariationDesFournisseursDImmobilisations"/>
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    <link:label id="lab_ark_AcquisitionOuCessionDactionsPropres_label_fr" xlink:label="lab_ark_AcquisitionOuCessionDactionsPropres" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="fr">Acquisition Ou Cession D'actions Propres</link:label>
    <link:label id="lab_ark_AcquisitionOuCessionDactionsPropres_documentation_fr" xlink:label="lab_ark_AcquisitionOuCessionDactionsPropres" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Acquisition Ou Cession D'actions Propres</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_AcquisitionOuCessionDactionsPropres" xlink:href="ark-2025-12-31.xsd#ark_AcquisitionOuCessionDactionsPropres"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_AcquisitionOuCessionDactionsPropres" xlink:to="lab_ark_AcquisitionOuCessionDactionsPropres" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_df8db31d-7eb1-480d-9828-26a0e72b24d9_totalLabel_fr" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="fr">Flux de trésorerie résultant (utilisés dans le cadre) d’activités d’investissement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
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    <link:label id="lab_ark_ObligationsHybridesMember_label_fr" xlink:label="lab_ark_ObligationsHybridesMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="fr">Obligations Hybrides [Member]</link:label>
    <link:label id="lab_ark_ObligationsHybridesMember_documentation_fr" xlink:label="lab_ark_ObligationsHybridesMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Obligations Hybrides</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_ObligationsHybridesMember" xlink:href="ark-2025-12-31.xsd#ark_ObligationsHybridesMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_ObligationsHybridesMember" xlink:to="lab_ark_ObligationsHybridesMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ark_DividendsPaidToNon-ControllingInterestsAndPurchaseOfMinorityInterests_label_fr" xlink:label="lab_ark_DividendsPaidToNon-ControllingInterestsAndPurchaseOfMinorityInterests" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="fr">Dividendes Versés Aux Participations Ne Donnant Pas Le Contrôle Et Rachat De Minoritaires</link:label>
    <link:label id="lab_ark_DividendsPaidToNon-ControllingInterestsAndPurchaseOfMinorityInterests_documentation_fr" xlink:label="lab_ark_DividendsPaidToNon-ControllingInterestsAndPurchaseOfMinorityInterests" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Dividendes Versés Aux Participations Ne Donnant Pas Le Contrôle Et Rachat De Minoritaires</link:label>
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    <link:label id="lab_ark_CoutsEtChargesDExploitation_label_fr" xlink:label="lab_ark_CoutsEtChargesDExploitation" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="fr">Couts Et Charges D Exploitation</link:label>
    <link:label id="lab_ark_CoutsEtChargesDExploitation_documentation_fr" xlink:label="lab_ark_CoutsEtChargesDExploitation" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Couts Et Charges D Exploitation</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_CoutsEtChargesDExploitation" xlink:to="lab_ark_CoutsEtChargesDExploitation" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_InflowsOfCashFromInvestingActivities_1ef6bb02-4ebd-4adb-851d-7ab0583a370a_totalLabel_fr" xlink:label="lab_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="fr">Entrées de trésorerie provenant des activités d’investissement</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InflowsOfCashFromInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_InflowsOfCashFromInvestingActivities"/>
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    <link:label id="lab_ark_TransactionsAvecLesProprietairesAbstract_label_fr" xlink:label="lab_ark_TransactionsAvecLesProprietairesAbstract" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="fr">Transactions Avec Les Proprietaires [Abstract]</link:label>
    <link:label id="lab_ark_TransactionsAvecLesProprietairesAbstract_documentation_fr" xlink:label="lab_ark_TransactionsAvecLesProprietairesAbstract" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Transactions Avec Les Proprietaires</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ark_TransactionsAvecLesProprietairesAbstract" xlink:href="ark-2025-12-31.xsd#ark_TransactionsAvecLesProprietairesAbstract"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ark_TransactionsAvecLesProprietairesAbstract" xlink:to="lab_ark_TransactionsAvecLesProprietairesAbstract" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_b61ed464-1f07-48f2-a555-0e2736a9d6bd_totalLabel_fr" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="fr">Flux de trésorerie résultant (utilisés dans le cadre) des activités opérationnelles</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2024-03-27/full_ifrs/full_ifrs-cor_2024-03-27.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
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    <link:label id="lab_ark_AutresProvisionsEtImpotsDifferes_label_fr" xlink:label="lab_ark_AutresProvisionsEtImpotsDifferes" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="fr">Autres Provisions Et Impots Differes</link:label>
    <link:label id="lab_ark_AutresProvisionsEtImpotsDifferes_documentation_fr" xlink:label="lab_ark_AutresProvisionsEtImpotsDifferes" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="fr">Autres Provisions Et Impots Differes</link:label>
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