diff --git a/api/src/prescription/campaign/infrastructure/repositories/knowledge-element-snapshot-repository.js b/api/src/prescription/campaign/infrastructure/repositories/knowledge-element-snapshot-repository.js
index 8c73aaf6e1c..452a2a0e95a 100644
--- a/api/src/prescription/campaign/infrastructure/repositories/knowledge-element-snapshot-repository.js
+++ b/api/src/prescription/campaign/infrastructure/repositories/knowledge-element-snapshot-repository.js
@@ -97,4 +97,25 @@ const findMultipleUsersFromUserIdsAndSnappedAtDates = async function (userIdsAnd
   });
 };
 
-export { findByUserIdsAndSnappedAtDates, findMultipleUsersFromUserIdsAndSnappedAtDates, save };
+/**
+ *
+ * @param {number[]} campaignIds
+ * @returns {Object.<number, KnowledgeElement[]>}
+ */
+const findByCampaignIds = async function (campaignIds) {
+  const results = await knex
+    .select('campaignParticipationId', 'snapshot')
+    .from('knowledge-element-snapshots')
+    .whereIn('campaignParticipationId', campaignIds);
+
+  return Object.fromEntries(
+    results.map(({ campaignParticipationId, snapshot }) => [
+      campaignParticipationId,
+      snapshot.map(({ createdAt, ...data }) => {
+        return new KnowledgeElement({ ...data, createdAt: new Date(createdAt) });
+      }),
+    ]),
+  );
+};
+
+export { findByCampaignIds, findByUserIdsAndSnappedAtDates, findMultipleUsersFromUserIdsAndSnappedAtDates, save };
diff --git a/api/tests/prescription/campaign/integration/infrastructure/repositories/knowledge-element-snapshot-repository_test.js b/api/tests/prescription/campaign/integration/infrastructure/repositories/knowledge-element-snapshot-repository_test.js
index 626e489c18b..bd9daee7aa8 100644
--- a/api/tests/prescription/campaign/integration/infrastructure/repositories/knowledge-element-snapshot-repository_test.js
+++ b/api/tests/prescription/campaign/integration/infrastructure/repositories/knowledge-element-snapshot-repository_test.js
@@ -172,6 +172,72 @@ describe('Integration | Repository | KnowledgeElementSnapshotRepository', functi
     });
   });
 
+  describe('#findByCampaignIds', function () {
+    let userId1, userId2, campaignParticipationId, secondCampaignParticipationId, otherCampaignParticipationId;
+
+    beforeEach(function () {
+      userId1 = databaseBuilder.factory.buildUser().id;
+      userId2 = databaseBuilder.factory.buildUser().id;
+
+      campaignParticipationId = databaseBuilder.factory.buildCampaignParticipation({ userId: userId1 }).id;
+      secondCampaignParticipationId = databaseBuilder.factory.buildCampaignParticipation({ userId: userId2 }).id;
+      otherCampaignParticipationId = databaseBuilder.factory.buildCampaignParticipation({ userId: userId2 }).id;
+      return databaseBuilder.commit();
+    });
+
+    it('should find knowledge elements snapshoted grouped by campaignParticipationIds', async function () {
+      // given
+      const snappedAt1 = new Date('2020-01-02');
+      const knowledgeElement1 = databaseBuilder.factory.buildKnowledgeElement({ userId: userId1 });
+      databaseBuilder.factory.buildKnowledgeElementSnapshot({
+        userId: userId1,
+        snappedAt: snappedAt1,
+        snapshot: JSON.stringify([knowledgeElement1]),
+        campaignParticipationId,
+      });
+      const snappedAt2 = new Date('2020-02-02');
+      const knowledgeElement2 = databaseBuilder.factory.buildKnowledgeElement({ userId: userId2 });
+      databaseBuilder.factory.buildKnowledgeElementSnapshot({
+        userId: userId2,
+        snappedAt: snappedAt2,
+        snapshot: JSON.stringify([knowledgeElement2]),
+        campaignParticipationId: secondCampaignParticipationId,
+      });
+
+      const snappedAt3 = new Date('2020-02-03');
+      const knowledgeElement3 = databaseBuilder.factory.buildKnowledgeElement({ userId: userId2 });
+      databaseBuilder.factory.buildKnowledgeElementSnapshot({
+        userId: userId2,
+        snappedAt: snappedAt3,
+        snapshot: JSON.stringify([knowledgeElement3]),
+        campaignParticipationId: otherCampaignParticipationId,
+      });
+
+      await databaseBuilder.commit();
+
+      // when
+      const knowledgeElementsByUserId = await knowledgeElementSnapshotRepository.findByCampaignIds([
+        campaignParticipationId,
+        secondCampaignParticipationId,
+      ]);
+
+      // then
+      expect(knowledgeElementsByUserId).to.deep.equals({
+        [campaignParticipationId]: [knowledgeElement1],
+        [secondCampaignParticipationId]: [knowledgeElement2],
+      });
+    });
+
+    it('should return null associated to userId when user does not have a snapshot', async function () {
+      // when
+      const knowledgeElementsByUserId = await knowledgeElementSnapshotRepository.findByUserIdsAndSnappedAtDates({
+        [userId1]: new Date('2020-04-01T00:00:00Z'),
+      });
+
+      expect(knowledgeElementsByUserId[userId1]).to.be.null;
+    });
+  });
+
   describe('#findMultipleUsersFromUserIdsAndSnappedAtDates', function () {
     let userId1, userId2;
     let snappedAt1, snappedAt2, snappedAt3;