diff --git a/config/packages/chill_aside_activity.yaml b/config/packages/chill_aside_activity.yaml
new file mode 100644
index 000000000..eb5c2d70e
--- /dev/null
+++ b/config/packages/chill_aside_activity.yaml
@@ -0,0 +1,2 @@
+chill_aside_activity:
+    show_concerned_persons_count: hidden
diff --git a/src/Bundle/ChillAsideActivityBundle/src/DependencyInjection/ChillAsideActivityExtension.php b/src/Bundle/ChillAsideActivityBundle/src/DependencyInjection/ChillAsideActivityExtension.php
index 056f29ba1..6fa123146 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/DependencyInjection/ChillAsideActivityExtension.php
+++ b/src/Bundle/ChillAsideActivityBundle/src/DependencyInjection/ChillAsideActivityExtension.php
@@ -25,6 +25,7 @@ final class ChillAsideActivityExtension extends Extension implements PrependExte
         $config = $this->processConfiguration($configuration, $configs);
 
         $container->setParameter('chill_aside_activity.form.time_duration', $config['form']['time_duration']);
+        $container->setParameter('chill_aside_activity.show_concerned_persons_count', 'visible' === $config['show_concerned_persons_count']);
 
         $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../config'));
         $loader->load('services.yaml');
@@ -38,6 +39,24 @@ final class ChillAsideActivityExtension extends Extension implements PrependExte
     {
         $this->prependRoute($container);
         $this->prependCruds($container);
+        $this->prependTwigConfig($container);
+    }
+
+    protected function prependTwigConfig(ContainerBuilder $container)
+    {
+        // Get the configuration for this bundle
+        $chillAsideActivityConfig = $container->getExtensionConfig($this->getAlias());
+        $config = $this->processConfiguration($this->getConfiguration($chillAsideActivityConfig, $container), $chillAsideActivityConfig);
+
+        // Add configuration to twig globals
+        $twigConfig = [
+            'globals' => [
+                'chill_aside_activity_config' => [
+                    'show_concerned_persons_count' => 'visible' === $config['show_concerned_persons_count'],
+                ],
+            ],
+        ];
+        $container->prependExtensionConfig('twig', $twigConfig);
     }
 
     protected function prependCruds(ContainerBuilder $container)
diff --git a/src/Bundle/ChillAsideActivityBundle/src/DependencyInjection/Configuration.php b/src/Bundle/ChillAsideActivityBundle/src/DependencyInjection/Configuration.php
index 241a545a8..66f3d3c86 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/DependencyInjection/Configuration.php
+++ b/src/Bundle/ChillAsideActivityBundle/src/DependencyInjection/Configuration.php
@@ -141,6 +141,12 @@ class Configuration implements ConfigurationInterface
             ->end()
             ->end()
             ->end()
+            ->end()
+            ->enumNode('show_concerned_persons_count')
+            ->values(['hidden', 'visible'])
+            ->defaultValue('hidden')
+            ->info('Show the concerned persons count field in aside activity forms and views')
+            ->end()
             ->end();
 
         return $treeBuilder;
diff --git a/src/Bundle/ChillAsideActivityBundle/src/Entity/AsideActivity.php b/src/Bundle/ChillAsideActivityBundle/src/Entity/AsideActivity.php
index b7671c61a..0082deaf9 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/Entity/AsideActivity.php
+++ b/src/Bundle/ChillAsideActivityBundle/src/Entity/AsideActivity.php
@@ -62,6 +62,10 @@ class AsideActivity implements TrackCreationInterface, TrackUpdateInterface
     #[ORM\ManyToOne(targetEntity: User::class)]
     private User $updatedBy;
 
+    #[Assert\GreaterThanOrEqual(0)]
+    #[ORM\Column(type: \Doctrine\DBAL\Types\Types::INTEGER, nullable: true)]
+    private ?int $concernedPersonsCount = 0;
+
     public function getAgent(): ?User
     {
         return $this->agent;
@@ -186,4 +190,16 @@ class AsideActivity implements TrackCreationInterface, TrackUpdateInterface
 
         return $this;
     }
+
+    public function getConcernedPersonsCount(): ?int
+    {
+        return $this->concernedPersonsCount;
+    }
+
+    public function setConcernedPersonsCount(?int $concernedPersonsCount): self
+    {
+        $this->concernedPersonsCount = $concernedPersonsCount;
+
+        return $this;
+    }
 }
diff --git a/src/Bundle/ChillAsideActivityBundle/src/Export/Aggregator/ByConcernedPersonsCountAggregator.php b/src/Bundle/ChillAsideActivityBundle/src/Export/Aggregator/ByConcernedPersonsCountAggregator.php
new file mode 100644
index 000000000..444c49269
--- /dev/null
+++ b/src/Bundle/ChillAsideActivityBundle/src/Export/Aggregator/ByConcernedPersonsCountAggregator.php
@@ -0,0 +1,86 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\AsideActivityBundle\Export\Aggregator;
+
+use Chill\AsideActivityBundle\Export\Declarations;
+use Chill\MainBundle\Export\AggregatorInterface;
+use Doctrine\ORM\QueryBuilder;
+use Symfony\Component\Form\FormBuilderInterface;
+
+class ByConcernedPersonsCountAggregator implements AggregatorInterface
+{
+    public function addRole(): ?string
+    {
+        return null;
+    }
+
+    public function alterQuery(QueryBuilder $qb, $data, \Chill\MainBundle\Export\ExportGenerationContext $exportGenerationContext): void
+    {
+        $qb->addSelect('aside.concernedPersonsCount AS by_concerned_persons_count_aggregator')
+            ->addGroupBy('by_concerned_persons_count_aggregator');
+    }
+
+    public function applyOn(): string
+    {
+        return Declarations::ASIDE_ACTIVITY_TYPE;
+    }
+
+    public function buildForm(FormBuilderInterface $builder): void
+    {
+        // No form needed
+    }
+
+    public function getNormalizationVersion(): int
+    {
+        return 1;
+    }
+
+    public function normalizeFormData(array $formData): array
+    {
+        return [];
+    }
+
+    public function denormalizeFormData(array $formData, int $fromVersion): array
+    {
+        return [];
+    }
+
+    public function getFormDefaultData(): array
+    {
+        return [];
+    }
+
+    public function getLabels($key, array $values, $data): callable
+    {
+        return function ($value): string {
+            if ('_header' === $value) {
+                return 'export.aggregator.Concerned persons count';
+            }
+
+            if (null === $value) {
+                return 'export.aggregator.No concerned persons count specified';
+            }
+
+            return (string) $value;
+        };
+    }
+
+    public function getQueryKeys($data): array
+    {
+        return ['by_concerned_persons_count_aggregator'];
+    }
+
+    public function getTitle(): string
+    {
+        return 'export.aggregator.Group by concerned persons count';
+    }
+}
diff --git a/src/Bundle/ChillAsideActivityBundle/src/Export/Export/SumConcernedPersonsCountAsideActivity.php b/src/Bundle/ChillAsideActivityBundle/src/Export/Export/SumConcernedPersonsCountAsideActivity.php
new file mode 100644
index 000000000..ab22302c2
--- /dev/null
+++ b/src/Bundle/ChillAsideActivityBundle/src/Export/Export/SumConcernedPersonsCountAsideActivity.php
@@ -0,0 +1,116 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\AsideActivityBundle\Export\Export;
+
+use Chill\AsideActivityBundle\Export\Declarations;
+use Chill\AsideActivityBundle\Repository\AsideActivityRepository;
+use Chill\AsideActivityBundle\Security\AsideActivityVoter;
+use Chill\MainBundle\Export\ExportInterface;
+use Chill\MainBundle\Export\FormatterInterface;
+use Chill\MainBundle\Export\GroupedExportInterface;
+use Doctrine\ORM\Query;
+use Symfony\Component\Form\FormBuilderInterface;
+
+class SumConcernedPersonsCountAsideActivity implements ExportInterface, GroupedExportInterface
+{
+    public function __construct(private readonly AsideActivityRepository $repository) {}
+
+    public function buildForm(FormBuilderInterface $builder) {}
+
+    public function getNormalizationVersion(): int
+    {
+        return 1;
+    }
+
+    public function normalizeFormData(array $formData): array
+    {
+        return [];
+    }
+
+    public function denormalizeFormData(array $formData, int $fromVersion): array
+    {
+        return [];
+    }
+
+    public function getFormDefaultData(): array
+    {
+        return [];
+    }
+
+    public function getAllowedFormattersTypes(): array
+    {
+        return [FormatterInterface::TYPE_TABULAR];
+    }
+
+    public function getDescription(): string
+    {
+        return 'export.Sum concerned persons count for aside activities';
+    }
+
+    public function getGroup(): string
+    {
+        return 'export.Exports of aside activities';
+    }
+
+    public function getLabels($key, array $values, $data)
+    {
+        if ('export_sum_concerned_persons_count' !== $key) {
+            throw new \LogicException("the key {$key} is not used by this export");
+        }
+
+        $labels = array_combine($values, $values);
+        $labels['_header'] = $this->getTitle();
+
+        return static fn ($value) => $labels[$value];
+    }
+
+    public function getQueryKeys($data): array
+    {
+        return ['export_sum_concerned_persons_count'];
+    }
+
+    public function getResult($query, $data, \Chill\MainBundle\Export\ExportGenerationContext $context): array
+    {
+        return $query->getQuery()->getResult(Query::HYDRATE_SCALAR);
+    }
+
+    public function getTitle(): string
+    {
+        return 'export.Sum concerned persons count for aside activities';
+    }
+
+    public function getType(): string
+    {
+        return Declarations::ASIDE_ACTIVITY_TYPE;
+    }
+
+    public function initiateQuery(array $requiredModifiers, array $acl, array $data, \Chill\MainBundle\Export\ExportGenerationContext $context): \Doctrine\ORM\QueryBuilder
+    {
+        $qb = $this->repository->createQueryBuilder('aside');
+
+        $qb->select('SUM(COALESCE(aside.concernedPersonsCount, 0)) as export_sum_concerned_persons_count');
+
+        return $qb;
+    }
+
+    public function requiredRole(): string
+    {
+        return AsideActivityVoter::STATS;
+    }
+
+    public function supportsModifiers(): array
+    {
+        return [
+            Declarations::ASIDE_ACTIVITY_TYPE,
+        ];
+    }
+}
diff --git a/src/Bundle/ChillAsideActivityBundle/src/Form/AsideActivityFormType.php b/src/Bundle/ChillAsideActivityBundle/src/Form/AsideActivityFormType.php
index d6fcb821c..ea04fdc42 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/Form/AsideActivityFormType.php
+++ b/src/Bundle/ChillAsideActivityBundle/src/Form/AsideActivityFormType.php
@@ -21,6 +21,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToTimestampTransformer;
 use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
+use Symfony\Component\Form\Extension\Core\Type\IntegerType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\FormEvents;
@@ -29,11 +30,13 @@ use Symfony\Component\OptionsResolver\OptionsResolver;
 final class AsideActivityFormType extends AbstractType
 {
     private readonly array $timeChoices;
+    private readonly bool $showConcernedPersonsCount;
 
     public function __construct(
         ParameterBagInterface $parameterBag,
     ) {
         $this->timeChoices = $parameterBag->get('chill_aside_activity.form.time_duration');
+        $this->showConcernedPersonsCount = $parameterBag->get('chill_aside_activity.show_concerned_persons_count');
     }
 
     public function buildForm(FormBuilderInterface $builder, array $options)
@@ -76,6 +79,16 @@ final class AsideActivityFormType extends AbstractType
             ->add('location', PickUserLocationType::class)
         ;
 
+        if ($this->showConcernedPersonsCount) {
+            $builder->add('concernedPersonsCount', IntegerType::class, [
+                'label' => 'Concerned persons count',
+                'required' => false,
+                'attr' => [
+                    'min' => 0,
+                ],
+            ]);
+        }
+
         foreach (['duration'] as $fieldName) {
             $builder->get($fieldName)
                 ->addModelTransformer($durationTimeTransformer);
diff --git a/src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/index.html.twig b/src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/index.html.twig
index 0a8648749..0d06e5ba9 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/index.html.twig
+++ b/src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/index.html.twig
@@ -42,6 +42,11 @@
                                 {%- if entity.location.name is defined -%}
                                     <div><i class="fa fa-fw fa-map-marker"></i>{{ entity.location.name }}</div>
                                 {%- endif -%}
+
+                                {%- if entity.concernedPersonsCount > 0 -%}
+                                    <div><i class="fa fa-fw fa-user"></i>{{ entity.concernedPersonsCount }}</div>
+                                {%- endif -%}
+
 							</div>
 							<div class="item-col" style="justify-content: flex-end;">
 								<div class="box">
diff --git a/src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/view.html.twig b/src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/view.html.twig
index ef6faa9c6..330a2ab13 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/view.html.twig
+++ b/src/Bundle/ChillAsideActivityBundle/src/Resources/views/asideActivity/view.html.twig
@@ -38,6 +38,11 @@
 				<dt class="inline">{{ 'Duration'|trans }}</dt>
 				<dd>{{ entity.duration|date('H:i') }}</dd>
 
+                {% if chill_aside_activity_config.show_concerned_persons_count == 'visible' %}
+                    <dt class="inline">{{ 'Concerned persons count'|trans }}</dt>
+                    <dd>{{ entity.concernedPersonsCount }}</dd>
+                {% endif %}
+
 				<dt class="inline">{{ 'Remark'|trans }}</dt>
 				{%- if entity.note is empty -%}
 					<dd>
diff --git a/src/Bundle/ChillAsideActivityBundle/src/Tests/Export/Aggregator/ByConcernedPersonsCountAggregatorTest.php b/src/Bundle/ChillAsideActivityBundle/src/Tests/Export/Aggregator/ByConcernedPersonsCountAggregatorTest.php
new file mode 100644
index 000000000..a1d133d8c
--- /dev/null
+++ b/src/Bundle/ChillAsideActivityBundle/src/Tests/Export/Aggregator/ByConcernedPersonsCountAggregatorTest.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\AsideActivityBundle\Tests\Export\Aggregator;
+
+use Chill\AsideActivityBundle\Entity\AsideActivity;
+use Chill\AsideActivityBundle\Export\Aggregator\ByConcernedPersonsCountAggregator;
+use Chill\MainBundle\Test\Export\AbstractAggregatorTest;
+use Doctrine\ORM\EntityManagerInterface;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class ByConcernedPersonsCountAggregatorTest extends AbstractAggregatorTest
+{
+    public function getAggregator()
+    {
+        return new ByConcernedPersonsCountAggregator();
+    }
+
+    public static function getFormData(): array
+    {
+        return [
+            [],
+        ];
+    }
+
+    public static function getQueryBuilders(): iterable
+    {
+        self::bootKernel();
+        $em = self::getContainer()->get(EntityManagerInterface::class);
+
+        return [
+            $em->createQueryBuilder()
+                ->select('count(aside.id)')
+                ->from(AsideActivity::class, 'aside'),
+        ];
+    }
+}
diff --git a/src/Bundle/ChillAsideActivityBundle/src/Tests/Export/Export/SumConcernedPersonsCountAsideActivityTest.php b/src/Bundle/ChillAsideActivityBundle/src/Tests/Export/Export/SumConcernedPersonsCountAsideActivityTest.php
new file mode 100644
index 000000000..499986ac1
--- /dev/null
+++ b/src/Bundle/ChillAsideActivityBundle/src/Tests/Export/Export/SumConcernedPersonsCountAsideActivityTest.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\AsideActivityBundle\Tests\Export\Export;
+
+use Chill\AsideActivityBundle\Export\Export\SumConcernedPersonsCountAsideActivity;
+use Chill\AsideActivityBundle\Repository\AsideActivityRepository;
+use Chill\MainBundle\Test\Export\AbstractExportTest;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+final class SumConcernedPersonsCountAsideActivityTest extends AbstractExportTest
+{
+    protected function setUp(): void
+    {
+        self::bootKernel();
+    }
+
+    public function getExport()
+    {
+        $repository = self::getContainer()->get(AsideActivityRepository::class);
+
+        yield new SumConcernedPersonsCountAsideActivity($repository);
+    }
+
+    public static function getFormData(): array
+    {
+        return [
+            [],
+        ];
+    }
+
+    public static function getModifiersCombination(): array
+    {
+        return [
+            ['aside_activity'],
+        ];
+    }
+}
diff --git a/src/Bundle/ChillAsideActivityBundle/src/config/services/export.yaml b/src/Bundle/ChillAsideActivityBundle/src/config/services/export.yaml
index 40cb120da..efba7a8af 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/config/services/export.yaml
+++ b/src/Bundle/ChillAsideActivityBundle/src/config/services/export.yaml
@@ -20,6 +20,10 @@ services:
       tags:
           - { name: chill.export, alias: 'avg_aside_activity_duration' }
 
+  Chill\AsideActivityBundle\Export\Export\SumConcernedPersonsCountAsideActivity:
+      tags:
+          - { name: chill.export, alias: 'sum_aside_activity_concerned_persons_count' }
+
   ## Filters
   chill.aside_activity.export.date_filter:
     class: Chill\AsideActivityBundle\Export\Filter\ByDateFilter
@@ -70,3 +74,7 @@ services:
   Chill\AsideActivityBundle\Export\Aggregator\ByLocationAggregator:
       tags:
           - { name: chill.export_aggregator, alias: 'aside_activity_location_aggregator' }
+
+  Chill\AsideActivityBundle\Export\Aggregator\ByConcernedPersonsCountAggregator:
+      tags:
+          - { name: chill.export_aggregator, alias: 'aside_activity_concerned_persons_count_aggregator' }
diff --git a/src/Bundle/ChillAsideActivityBundle/src/migrations/Version20251006113048.php b/src/Bundle/ChillAsideActivityBundle/src/migrations/Version20251006113048.php
new file mode 100644
index 000000000..8ea1dbf4c
--- /dev/null
+++ b/src/Bundle/ChillAsideActivityBundle/src/migrations/Version20251006113048.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\Migrations\AsideActivity;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20251006113048 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add concernedPersonsCount property to AsideActivity entity';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE chill_asideactivity.asideactivity ADD concernedPersonsCount INT DEFAULT 0');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE chill_asideactivity.AsideActivity DROP concernedPersonsCount');
+    }
+}
diff --git a/src/Bundle/ChillAsideActivityBundle/src/translations/messages.fr.yml b/src/Bundle/ChillAsideActivityBundle/src/translations/messages.fr.yml
index 7d3c7a20e..664cd41b7 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/translations/messages.fr.yml
+++ b/src/Bundle/ChillAsideActivityBundle/src/translations/messages.fr.yml
@@ -27,6 +27,7 @@ Emergency: Urgent
 by: "Par "
 location: Lieu
 Asideactivity location: Localisation de l'activité
+Concerned persons count: Nombre d'usager concernés
 
 # Crud
 crud:
@@ -190,6 +191,7 @@ export:
     Count aside activities by various parameters.: Compte le nombre d'activités annexes selon divers critères
     Average aside activities duration: Durée moyenne des activités annexes
     Sum aside activities duration: Durée des activités annexes
+    Sum concerned persons count for aside activities: Nombre d'usager concernés par les activités annexes
     filter:
         Filter by aside activity date: Filtrer les activités annexes par date
         Filter by aside activity type: Filtrer les activités annexes par type d'activité
@@ -210,6 +212,8 @@ export:
         'Filtered by aside activity location: only %location%': "Filtré par localisation: uniquement %location%"
     aggregator:
         Group by aside activity type: Grouper les activités annexes par type d'activité
+        Group by concerned persons count: Grouper les activités annexes par nombre d'usagers conernés
+        Concerned persons count: Nombre d'usagers concernés
         Aside activity type: Type d'activité annexe
         by_user_job:
             Aggregate by user job: Grouper les activités annexes par métier des utilisateurs