diff --git a/backend/src/database/repositories/memberRepository.ts b/backend/src/database/repositories/memberRepository.ts
index 4cb8be8e8f..5a6f668d81 100644
--- a/backend/src/database/repositories/memberRepository.ts
+++ b/backend/src/database/repositories/memberRepository.ts
@@ -298,12 +298,11 @@ class MemberRepository {
     const HIGH_CONFIDENCE_LOWER_BOUND = 0.9
     const MEDIUM_CONFIDENCE_LOWER_BOUND = 0.7
 
-    const qx = SequelizeRepository.getQueryExecutor(options)
-    const currentSegments = SequelizeRepository.getSegmentIds(options)
-
-    const subprojectIds = await getSegmentSubprojectIds(qx, currentSegments)
+    // Member segments are aggregated at each hierarchy level (group -> project -> subproject).
+    // Match the selected segment ID directly; do not expand to leaf subprojects.
+    const segmentIds = SequelizeRepository.getSegmentIds(options)
 
-    if (subprojectIds.length === 0) {
+    if (segmentIds.length === 0) {
       return args.countOnly
         ? { count: '0' }
         : {
@@ -364,7 +363,7 @@ class MemberRepository {
         similarityFilter,
         displayNameFilter,
         {
-          segmentIds: subprojectIds,
+          segmentIds,
           displayName: args?.filter?.displayName ? `${args.filter.displayName}%` : undefined,
           memberId: args?.filter?.memberId,
         },
@@ -406,7 +405,7 @@ class MemberRepository {
       `,
       {
         replacements: {
-          segmentIds: subprojectIds,
+          segmentIds,
           limit: args.limit,
           offset: args.offset,
           displayName: args?.filter?.displayName ? `${args.filter.displayName}%` : undefined,
@@ -512,7 +511,7 @@ class MemberRepository {
         similarityFilter,
         displayNameFilter,
         {
-          segmentIds: subprojectIds,
+          segmentIds,
           memberId: args?.filter?.memberId,
           displayName: args?.filter?.displayName ? `${args.filter.displayName}%` : undefined,
         },
diff --git a/backend/src/database/repositories/organizationRepository.ts b/backend/src/database/repositories/organizationRepository.ts
index b9f5fc2e5c..e64d83eb8d 100644
--- a/backend/src/database/repositories/organizationRepository.ts
+++ b/backend/src/database/repositories/organizationRepository.ts
@@ -849,10 +849,9 @@ class OrganizationRepository {
     const HIGH_CONFIDENCE_LOWER_BOUND = 0.9
     const MEDIUM_CONFIDENCE_LOWER_BOUND = 0.7
 
-    const qx = SequelizeRepository.getQueryExecutor(options)
-    const currentSegments = SequelizeRepository.getSegmentIds(options)
-
-    const segmentIds = await getSegmentSubprojectIds(qx, currentSegments)
+    // Organization segments are aggregated at each hierarchy level (group -> project -> subproject).
+    // Match the selected segment ID(s) directly; do not expand to leaf subprojects.
+    const segmentIds = SequelizeRepository.getSegmentIds(options)
 
     let similarityFilter = ''
     const similarityConditions = []
diff --git a/frontend/src/modules/data-quality/components/member/data-quality-member-merge-suggestions.vue b/frontend/src/modules/data-quality/components/member/data-quality-member-merge-suggestions.vue
index 60e12a1df3..b63d52486b 100644
--- a/frontend/src/modules/data-quality/components/member/data-quality-member-merge-suggestions.vue
+++ b/frontend/src/modules/data-quality/components/member/data-quality-member-merge-suggestions.vue
@@ -62,8 +62,6 @@ import LfSpinner from '@/ui-kit/spinner/Spinner.vue';
 import LfButton from '@/ui-kit/button/Button.vue';
 import LfIcon from '@/ui-kit/icon/Icon.vue';
 import AppMemberMergeSuggestionsDialog from '@/modules/member/components/member-merge-suggestions-dialog.vue';
-import { storeToRefs } from 'pinia';
-import { useLfSegmentsStore } from '@/modules/lf/segments/store';
 import LfMemberMergeSuggestionDropdown
   from '@/modules/member/components/suggestions/member-merge-suggestion-dropdown.vue';
 import LfScrollBodyControll from '@/ui-kit/scrollcontroll/ScrollBodyControll.vue';
@@ -81,23 +79,7 @@ const mergeSuggestions = ref<any[]>([]);
 const isModalOpen = ref<boolean>(false);
 const detailsOffset = ref<number>(0);
 
-const { selectedProjectGroup } = storeToRefs(useLfSegmentsStore());
-
-const segments = computed(() => (selectedProjectGroup.value?.id === props.projectGroup
-  ? [
-    selectedProjectGroup.value?.id,
-    ...selectedProjectGroup.value.projects.map((p) => [
-      ...p.subprojects.map((sp) => sp.id),
-    ]).flat(),
-  ]
-  : [
-    props.projectGroup,
-    ...selectedProjectGroup.value.projects
-      .filter((p) => p.id === props.projectGroup)
-      .map((p) => [
-        ...p.subprojects.map((sp) => sp.id),
-      ]).flat(),
-  ]));
+const segments = computed(() => [props.projectGroup]);
 
 const loadMergeSuggestions = () => {
   loading.value = true;
diff --git a/frontend/src/modules/data-quality/components/organization/data-quality-organization-merge-suggestions.vue b/frontend/src/modules/data-quality/components/organization/data-quality-organization-merge-suggestions.vue
index cd70044fff..6e42332e16 100644
--- a/frontend/src/modules/data-quality/components/organization/data-quality-organization-merge-suggestions.vue
+++ b/frontend/src/modules/data-quality/components/organization/data-quality-organization-merge-suggestions.vue
@@ -58,8 +58,6 @@ import LfDataQualityOrganizationMergeSuggestionsItem
   from '@/modules/data-quality/components/organization/data-quality-organization-merge-suggestions-item.vue';
 import AppOrganizationMergeSuggestionsDialog
   from '@/modules/organization/components/organization-merge-suggestions-dialog.vue';
-import { storeToRefs } from 'pinia';
-import { useLfSegmentsStore } from '@/modules/lf/segments/store';
 import LfScrollBodyControll from '@/ui-kit/scrollcontroll/ScrollBodyControll.vue';
 
 const props = defineProps<{
@@ -75,23 +73,7 @@ const mergeSuggestions = ref<any[]>([]);
 const isModalOpen = ref<boolean>(false);
 const detailsOffset = ref<number>(0);
 
-const { selectedProjectGroup } = storeToRefs(useLfSegmentsStore());
-
-const segments = computed(() => (selectedProjectGroup.value?.id === props.projectGroup
-  ? [
-    selectedProjectGroup.value?.id,
-    ...selectedProjectGroup.value.projects.map((p) => [
-      ...p.subprojects.map((sp) => sp.id),
-    ]).flat(),
-  ]
-  : [
-    props.projectGroup,
-    ...selectedProjectGroup.value.projects
-      .filter((p) => p.id === props.projectGroup)
-      .map((p) => [
-        ...p.subprojects.map((sp) => sp.id),
-      ]).flat(),
-  ]));
+const segments = computed(() => [props.projectGroup]);
 
 const loadMergeSuggestions = () => {
   loading.value = true;
diff --git a/frontend/src/modules/organization/organization-service.js b/frontend/src/modules/organization/organization-service.js
index 526bca3a25..bfcbdeecf3 100644
--- a/frontend/src/modules/organization/organization-service.js
+++ b/frontend/src/modules/organization/organization-service.js
@@ -1,7 +1,6 @@
 import authAxios from '@/shared/axios/auth-axios';
 import { AuthService } from '@/modules/auth/services/auth.service'; import { storeToRefs } from 'pinia';
 import { useLfSegmentsStore } from '@/modules/lf/segments/store';
-import { getSegmentsFromProjectGroup } from '@/utils/segments';
 
 const getSelectedProjectGroup = () => {
   const lsSegmentsStore = useLfSegmentsStore();
@@ -216,10 +215,7 @@ export class OrganizationService {
   }
 
   static async fetchMergeSuggestions(limit, offset, query) {
-    const segments = [
-      ...getSegmentsFromProjectGroup(getSelectedProjectGroup()),
-      getSelectedProjectGroup().id,
-    ];
+    const segments = [getSelectedProjectGroup().id];
 
     const data = {
       limit,
diff --git a/frontend/src/modules/organization/services/organization.api.service.ts b/frontend/src/modules/organization/services/organization.api.service.ts
index 92964ecdbd..66cac7ce85 100644
--- a/frontend/src/modules/organization/services/organization.api.service.ts
+++ b/frontend/src/modules/organization/services/organization.api.service.ts
@@ -1,6 +1,5 @@
 import authAxios from '@/shared/axios/auth-axios';
 import { Organization } from '@/modules/organization/types/Organization';
-import { getSegmentsFromProjectGroup } from '@/utils/segments';
 import { useLfSegmentsStore } from '@/modules/lf/segments/store';
 import { storeToRefs } from 'pinia';
 
@@ -33,10 +32,7 @@ export class OrganizationApiService {
     const lsSegmentsStore = useLfSegmentsStore();
     const { selectedProjectGroup } = storeToRefs(lsSegmentsStore);
 
-    const segments = [
-      ...getSegmentsFromProjectGroup(selectedProjectGroup.value),
-      selectedProjectGroup.value?.id,
-    ];
+    const segments = [selectedProjectGroup.value?.id];
 
     const data = {
       limit,