diff --git a/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/__tests__/add-default-conjunction.util.spec.ts b/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/__tests__/add-default-conjunction.util.spec.ts
index e1a2c69af19..6481b20a252 100644
--- a/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/__tests__/add-default-conjunction.util.spec.ts
+++ b/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/__tests__/add-default-conjunction.util.spec.ts
@@ -12,4 +12,24 @@ describe('addDefaultConjunctionIfMissing', () => {
       'and(field[eq]:1)',
     );
   });
+
+  it('should add default conjunction when a bare filter is mixed with a nested conjunction', () => {
+    expect(
+      addDefaultConjunctionIfMissing(
+        "status[eq]:'TODO',and(title[ilike]:'%test%')",
+      ),
+    ).toEqual("and(status[eq]:'TODO',and(title[ilike]:'%test%'))");
+  });
+
+  it('should not add default conjunction for root or conjunction', () => {
+    expect(addDefaultConjunctionIfMissing('or(field[eq]:1)')).toEqual(
+      'or(field[eq]:1)',
+    );
+  });
+
+  it('should not add default conjunction for root not conjunction', () => {
+    expect(addDefaultConjunctionIfMissing('not(field[eq]:1)')).toEqual(
+      'not(field[eq]:1)',
+    );
+  });
 });
diff --git a/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/add-default-conjunction.util.ts b/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/add-default-conjunction.util.ts
index 8fde997cd91..83c7cc0efb7 100644
--- a/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/add-default-conjunction.util.ts
+++ b/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/add-default-conjunction.util.ts
@@ -1,9 +1,12 @@
-import { Conjunctions } from 'src/engine/api/rest/input-request-parsers/filter-parser-utils/parse-filter.util';
+import {
+  Conjunctions,
+  ROOT_FILTER_CONJUNCTION_REGEX,
+} from 'src/engine/api/rest/input-request-parsers/filter-parser-utils/parse-filter.util';
 
 export const DEFAULT_CONJUNCTION = Conjunctions.and;
 
 export const addDefaultConjunctionIfMissing = (filterQuery: string): string => {
-  if (!(filterQuery.includes('(') && filterQuery.includes(')'))) {
+  if (!ROOT_FILTER_CONJUNCTION_REGEX.test(filterQuery)) {
     return `${DEFAULT_CONJUNCTION}(${filterQuery})`;
   }
 
diff --git a/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/parse-filter.util.ts b/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/parse-filter.util.ts
index 0b8fd3dd15f..82c5221971d 100644
--- a/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/parse-filter.util.ts
+++ b/packages/twenty-server/src/engine/api/rest/input-request-parsers/filter-parser-utils/parse-filter.util.ts
@@ -17,13 +17,15 @@ export enum Conjunctions {
   not = 'not',
 }
 
+export const ROOT_FILTER_CONJUNCTION_REGEX = new RegExp(
+  `^(${Object.values(Conjunctions).join('|')})\\((.+)\\)$`,
+);
+
 export const parseFilter = (
   filterQuery: string,
 ): Record<string, FieldValue> => {
   const result = {};
-  const match = filterQuery.match(
-    `^(${Object.values(Conjunctions).join('|')})\\((.+)\\)$`,
-  );
+  const match = filterQuery.match(ROOT_FILTER_CONJUNCTION_REGEX);
 
   if (match) {
     const conjunction = match?.[1];