diff --git a/gitnexus/src/core/ingestion/type-env.ts b/gitnexus/src/core/ingestion/type-env.ts
index 5458d437e..e5fbb8cd2 100644
--- a/gitnexus/src/core/ingestion/type-env.ts
+++ b/gitnexus/src/core/ingestion/type-env.ts
@@ -459,19 +459,19 @@ const SKIP_SUBTREE_TYPES = new Set([
 ]);
 
 const CLASS_LIKE_TYPES = new Set(['Class', 'Struct', 'Interface']);
+type ClassDefRef = { nodeId: string; type: string; filePath: string };
 
 const lookupClassDefsByName = (
   symbolTable: SymbolTable,
   name: string,
   allowedTypes: ReadonlySet<string> = CLASS_LIKE_TYPES,
-): Array<{ nodeId: string; type: string }> =>
-  symbolTable.lookupClassByName(name).filter((d) => allowedTypes.has(d.type));
+): ClassDefRef[] => symbolTable.lookupClassByName(name).filter((d) => allowedTypes.has(d.type));
 
 /** Memoize class definition lookups during fixpoint iteration.
  *  SymbolTable is immutable during type resolution, so results never change.
  *  Eliminates redundant array allocations + filter scans across iterations. */
 const createClassDefCache = (symbolTable?: SymbolTable) => {
-  const cache = new Map<string, Array<{ nodeId: string; type: string }>>();
+  const cache = new Map<string, ClassDefRef[]>();
   return (typeName: string) => {
     let result = cache.get(typeName);
     if (result === undefined) {
@@ -561,7 +561,7 @@ export const isSubclassOf = (
 const walkParentChain = <T>(
   typeName: string,
   parentMap: ReadonlyMap<string, readonly string[]> | undefined,
-  getClassDefs: (name: string) => Array<{ nodeId: string; type: string }>,
+  getClassDefs: (name: string) => ClassDefRef[],
   lookupOnClass: (nodeId: string) => T | undefined,
 ): T | undefined => {
   if (!parentMap) return undefined;
@@ -597,7 +597,7 @@ const resolveFieldType = (
   field: string,
   scopeEnv: ReadonlyMap<string, string>,
   symbolTable?: SymbolTable,
-  getClassDefs?: (typeName: string) => Array<{ nodeId: string; type: string }>,
+  getClassDefs?: (typeName: string) => ClassDefRef[],
   parentMap?: ReadonlyMap<string, readonly string[]>,
 ): string | undefined => {
   if (!symbolTable) return undefined;
@@ -619,14 +619,14 @@ const resolveFieldType = (
 
 /** Resolve a method's return type given a receiver variable and method name.
  *  Uses SymbolTable to find class nodeIds for the receiver's type, then
- *  looks up the method via lookupFuzzyCallable filtered by ownerId.
+ *  looks up the method via owner-scoped lookupMethodByOwner.
  *  Falls back to MRO parent chain walking if direct lookup fails (Phase 11A). */
 const resolveMethodReturnType = (
   receiver: string,
   method: string,
   scopeEnv: ReadonlyMap<string, string>,
   symbolTable?: SymbolTable,
-  getClassDefs?: (typeName: string) => Array<{ nodeId: string; type: string }>,
+  getClassDefs?: (typeName: string) => ClassDefRef[],
   parentMap?: ReadonlyMap<string, readonly string[]>,
 ): string | undefined => {
   if (!symbolTable) return undefined;
@@ -642,21 +642,29 @@ const resolveMethodReturnType = (
   const classDefs = lookup(receiverType);
   if (classDefs.length === 0) return undefined;
   // Direct lookup first
-  const classNodeIds = new Set(classDefs.map((d) => d.nodeId));
-  const methods = symbolTable
-    .lookupFuzzyCallable(method)
-    .filter((d) => d.ownerId && classNodeIds.has(d.ownerId));
+  const directMethodLookups = classDefs.map((d) => ({
+    classDef: d,
+    methodDef: symbolTable.lookupMethodByOwner(d.nodeId, method),
+  }));
+  const hasAmbiguousDirectLookup = directMethodLookups.some(({ classDef, methodDef }) => {
+    if (methodDef) return false;
+    return symbolTable
+      .lookupExactAll(classDef.filePath, method)
+      .some((d) => d.ownerId === classDef.nodeId);
+  });
+  if (hasAmbiguousDirectLookup) return undefined;
+  const methods = directMethodLookups
+    .map(({ methodDef }) => methodDef)
+    .filter((d): d is NonNullable<typeof d> => d !== undefined);
   if (methods.length === 1 && methods[0].returnType) {
     return extractReturnTypeName(methods[0].returnType);
   }
   // MRO parent chain walking on miss
   if (methods.length === 0) {
     const inherited = walkParentChain(receiverType, parentMap, lookup, (nodeId) => {
-      const parentMethods = symbolTable
-        .lookupFuzzyCallable(method)
-        .filter((d) => d.ownerId === nodeId);
-      if (parentMethods.length !== 1 || !parentMethods[0].returnType) return undefined;
-      return extractReturnTypeName(parentMethods[0].returnType);
+      const parentMethod = symbolTable.lookupMethodByOwner(nodeId, method);
+      if (!parentMethod?.returnType) return undefined;
+      return extractReturnTypeName(parentMethod.returnType);
     });
     return inherited;
   }
diff --git a/gitnexus/test/unit/type-env.test.ts b/gitnexus/test/unit/type-env.test.ts
index 47942c7e3..db46bb31b 100644
--- a/gitnexus/test/unit/type-env.test.ts
+++ b/gitnexus/test/unit/type-env.test.ts
@@ -1,6 +1,10 @@
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, vi } from 'vitest';
 import { buildTypeEnv, type TypeEnvironment } from '../../src/core/ingestion/type-env.js';
-import type { SymbolDefinition, SymbolTable } from '../../src/core/ingestion/symbol-table.js';
+import {
+  createSymbolTable,
+  type SymbolDefinition,
+  type SymbolTable,
+} from '../../src/core/ingestion/symbol-table.js';
 import {
   stripNullable,
   extractSimpleTypeName,
@@ -2445,6 +2449,394 @@ function process(user: User) {
         const typeEnv = buildTypeEnv(tree, 'typescript', { symbolTable });
         expect(flatGet(typeEnv, 'addr')).toBeUndefined();
       });
+
+      it('method return type resolution uses lookupMethodByOwner-backed class defs', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const lookupFuzzyCallable = vi.fn(() => []);
+        const symbolTable = createMockSymbolTable({
+          lookupClassByName: (name: string) =>
+            name === 'Repo' ? [createClassDef('Repo', 'Class', 'models.ts')] : [],
+          lookupMethodByOwner: (ownerNodeId: string, methodName: string) =>
+            ownerNodeId === 'class:Repo' && methodName === 'getProfile'
+              ? {
+                  nodeId: 'method:Repo:getProfile',
+                  filePath: 'models.ts',
+                  type: 'Method',
+                  ownerId: 'class:Repo',
+                  returnType: 'Profile',
+                }
+              : undefined,
+          lookupFuzzyCallable,
+        });
+        const typeEnv = buildTypeEnv(tree, 'typescript', { symbolTable });
+        expect(flatGet(typeEnv, 'profile')).toBe('Profile');
+        expect(lookupFuzzyCallable).not.toHaveBeenCalledWith('getProfile');
+      });
+
+      it('inherited method return type resolution uses lookupMethodByOwner on parent owners', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const lookupFuzzyCallable = vi.fn(() => []);
+        const symbolTable = createMockSymbolTable({
+          lookupClassByName: (name: string) => {
+            if (name === 'Repo') return [createClassDef('Repo', 'Class', 'models.ts')];
+            if (name === 'BaseRepo') return [createClassDef('BaseRepo', 'Class', 'base.ts')];
+            return [];
+          },
+          lookupMethodByOwner: (ownerNodeId: string, methodName: string) =>
+            ownerNodeId === 'class:BaseRepo' && methodName === 'getProfile'
+              ? {
+                  nodeId: 'method:BaseRepo:getProfile',
+                  filePath: 'base.ts',
+                  type: 'Method',
+                  ownerId: 'class:BaseRepo',
+                  returnType: 'Profile',
+                }
+              : undefined,
+          lookupFuzzyCallable,
+        });
+        const typeEnv = buildTypeEnv(tree, 'typescript', {
+          symbolTable,
+          parentMap: new Map([['Repo', ['BaseRepo']]]),
+        });
+        expect(flatGet(typeEnv, 'profile')).toBe('Profile');
+        expect(lookupFuzzyCallable).not.toHaveBeenCalledWith('getProfile');
+      });
+
+      it('method return type resolution handles multiple class defs when only one owner has the method', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const lookupFuzzyCallable = vi.fn(() => []);
+        const symbolTable = createMockSymbolTable({
+          lookupClassByName: (name: string) =>
+            name === 'Repo'
+              ? [
+                  createClassDef('Repo', 'Class', 'models-a.ts'),
+                  {
+                    ...createClassDef('Repo', 'Class', 'models-b.ts'),
+                    nodeId: 'class:Repo:partial',
+                  },
+                ]
+              : [],
+          lookupMethodByOwner: (ownerNodeId: string, methodName: string) =>
+            ownerNodeId === 'class:Repo:partial' && methodName === 'getProfile'
+              ? {
+                  nodeId: 'method:Repo:getProfile',
+                  filePath: 'models-b.ts',
+                  type: 'Method',
+                  ownerId: 'class:Repo:partial',
+                  returnType: 'Profile',
+                }
+              : undefined,
+          lookupExactAll: () => [],
+          lookupFuzzyCallable,
+        });
+        const typeEnv = buildTypeEnv(tree, 'typescript', { symbolTable });
+        expect(flatGet(typeEnv, 'profile')).toBe('Profile');
+        expect(lookupFuzzyCallable).not.toHaveBeenCalledWith('getProfile');
+      });
+
+      it('method return type resolution with multiple class defs falls back to MRO when direct owners miss', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const lookupFuzzyCallable = vi.fn(() => []);
+        const symbolTable = createMockSymbolTable({
+          lookupClassByName: (name: string) => {
+            if (name === 'Repo') {
+              return [
+                createClassDef('Repo', 'Class', 'models-a.ts'),
+                { ...createClassDef('Repo', 'Class', 'models-b.ts'), nodeId: 'class:Repo:partial' },
+              ];
+            }
+            if (name === 'BaseRepo') return [createClassDef('BaseRepo', 'Class', 'base.ts')];
+            return [];
+          },
+          lookupMethodByOwner: (ownerNodeId: string, methodName: string) =>
+            ownerNodeId === 'class:BaseRepo' && methodName === 'getProfile'
+              ? {
+                  nodeId: 'method:BaseRepo:getProfile',
+                  filePath: 'base.ts',
+                  type: 'Method',
+                  ownerId: 'class:BaseRepo',
+                  returnType: 'Profile',
+                }
+              : undefined,
+          lookupExactAll: () => [],
+          lookupFuzzyCallable,
+        });
+        const typeEnv = buildTypeEnv(tree, 'typescript', {
+          symbolTable,
+          parentMap: new Map([['Repo', ['BaseRepo']]]),
+        });
+        expect(flatGet(typeEnv, 'profile')).toBe('Profile');
+        expect(lookupFuzzyCallable).not.toHaveBeenCalledWith('getProfile');
+      });
+
+      it('method return type resolution stays unresolved when multiple class defs each define the method', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const lookupFuzzyCallable = vi.fn(() => []);
+        const symbolTable = createMockSymbolTable({
+          lookupClassByName: (name: string) =>
+            name === 'Repo'
+              ? [
+                  createClassDef('Repo', 'Class', 'models-a.ts'),
+                  {
+                    ...createClassDef('Repo', 'Class', 'models-b.ts'),
+                    nodeId: 'class:Repo:partial',
+                  },
+                ]
+              : [],
+          lookupMethodByOwner: (ownerNodeId: string, methodName: string) => {
+            if (methodName !== 'getProfile') return undefined;
+            if (ownerNodeId === 'class:Repo') {
+              return {
+                nodeId: 'method:Repo:getProfile#a',
+                filePath: 'models-a.ts',
+                type: 'Method',
+                ownerId: 'class:Repo',
+                returnType: 'Profile',
+              };
+            }
+            if (ownerNodeId === 'class:Repo:partial') {
+              return {
+                nodeId: 'method:Repo:getProfile#b',
+                filePath: 'models-b.ts',
+                type: 'Method',
+                ownerId: 'class:Repo:partial',
+                returnType: 'Profile',
+              };
+            }
+            return undefined;
+          },
+          lookupExactAll: () => [],
+          lookupFuzzyCallable,
+        });
+        const typeEnv = buildTypeEnv(tree, 'typescript', { symbolTable });
+        expect(flatGet(typeEnv, 'profile')).toBeUndefined();
+        expect(lookupFuzzyCallable).not.toHaveBeenCalledWith('getProfile');
+      });
+
+      it('method return type resolution preserves same-return overload success', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const lookupFuzzyCallable = vi.fn(() => []);
+        const symbolTable = createMockSymbolTable({
+          lookupClassByName: (name: string) =>
+            name === 'Repo' ? [createClassDef('Repo', 'Class', 'models.ts')] : [],
+          lookupMethodByOwner: (ownerNodeId: string, methodName: string) =>
+            ownerNodeId === 'class:Repo' && methodName === 'getProfile'
+              ? {
+                  nodeId: 'method:Repo:getProfile#1',
+                  filePath: 'models.ts',
+                  type: 'Method',
+                  ownerId: 'class:Repo',
+                  returnType: 'Profile',
+                }
+              : undefined,
+          lookupExactAll: (filePath: string, name: string) =>
+            filePath === 'models.ts' && name === 'getProfile'
+              ? [
+                  {
+                    nodeId: 'method:Repo:getProfile#1',
+                    filePath: 'models.ts',
+                    type: 'Method',
+                    ownerId: 'class:Repo',
+                    returnType: 'Profile',
+                  },
+                  {
+                    nodeId: 'method:Repo:getProfile#2',
+                    filePath: 'models.ts',
+                    type: 'Method',
+                    ownerId: 'class:Repo',
+                    returnType: 'Profile',
+                  },
+                ]
+              : [],
+          lookupFuzzyCallable,
+        });
+        const typeEnv = buildTypeEnv(tree, 'typescript', { symbolTable });
+        expect(flatGet(typeEnv, 'profile')).toBe('Profile');
+        expect(lookupFuzzyCallable).not.toHaveBeenCalledWith('getProfile');
+      });
+
+      it('method return type resolution stays unresolved for ambiguous overloads with differing returns', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const lookupFuzzyCallable = vi.fn(() => []);
+        const symbolTable = createMockSymbolTable({
+          lookupClassByName: (name: string) => {
+            if (name === 'Repo') return [createClassDef('Repo', 'Class', 'models.ts')];
+            if (name === 'BaseRepo') return [createClassDef('BaseRepo', 'Class', 'base.ts')];
+            return [];
+          },
+          lookupMethodByOwner: (ownerNodeId: string, methodName: string) =>
+            ownerNodeId === 'class:BaseRepo' && methodName === 'getProfile'
+              ? {
+                  nodeId: 'method:BaseRepo:getProfile',
+                  filePath: 'base.ts',
+                  type: 'Method',
+                  ownerId: 'class:BaseRepo',
+                  returnType: 'Profile',
+                }
+              : undefined,
+          lookupExactAll: (filePath: string, name: string) =>
+            filePath === 'models.ts' && name === 'getProfile'
+              ? [
+                  {
+                    nodeId: 'method:Repo:getProfile#1',
+                    filePath: 'models.ts',
+                    type: 'Method',
+                    ownerId: 'class:Repo',
+                    returnType: 'User',
+                  },
+                  {
+                    nodeId: 'method:Repo:getProfile#2',
+                    filePath: 'models.ts',
+                    type: 'Method',
+                    ownerId: 'class:Repo',
+                    returnType: 'Admin',
+                  },
+                ]
+              : [],
+          lookupFuzzyCallable,
+        });
+        const typeEnv = buildTypeEnv(tree, 'typescript', {
+          symbolTable,
+          parentMap: new Map([['Repo', ['BaseRepo']]]),
+        });
+        expect(flatGet(typeEnv, 'profile')).toBeUndefined();
+        expect(lookupFuzzyCallable).not.toHaveBeenCalledWith('getProfile');
+      });
+
+      it('inherited method return type resolution preserves same-return overload success on parent owners', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const lookupFuzzyCallable = vi.fn(() => []);
+        const symbolTable = createMockSymbolTable({
+          lookupClassByName: (name: string) => {
+            if (name === 'Repo') return [createClassDef('Repo', 'Class', 'models.ts')];
+            if (name === 'BaseRepo') return [createClassDef('BaseRepo', 'Class', 'base.ts')];
+            return [];
+          },
+          lookupMethodByOwner: (ownerNodeId: string, methodName: string) =>
+            ownerNodeId === 'class:BaseRepo' && methodName === 'getProfile'
+              ? {
+                  nodeId: 'method:BaseRepo:getProfile#1',
+                  filePath: 'base.ts',
+                  type: 'Method',
+                  ownerId: 'class:BaseRepo',
+                  returnType: 'Profile',
+                }
+              : undefined,
+          lookupExactAll: (filePath: string, name: string) =>
+            filePath === 'base.ts' && name === 'getProfile'
+              ? [
+                  {
+                    nodeId: 'method:BaseRepo:getProfile#1',
+                    filePath: 'base.ts',
+                    type: 'Method',
+                    ownerId: 'class:BaseRepo',
+                    returnType: 'Profile',
+                  },
+                  {
+                    nodeId: 'method:BaseRepo:getProfile#2',
+                    filePath: 'base.ts',
+                    type: 'Method',
+                    ownerId: 'class:BaseRepo',
+                    returnType: 'Profile',
+                  },
+                ]
+              : [],
+          lookupFuzzyCallable,
+        });
+        const typeEnv = buildTypeEnv(tree, 'typescript', {
+          symbolTable,
+          parentMap: new Map([['Repo', ['BaseRepo']]]),
+        });
+        expect(flatGet(typeEnv, 'profile')).toBe('Profile');
+        expect(lookupFuzzyCallable).not.toHaveBeenCalledWith('getProfile');
+      });
+
+      it('inherited method return type resolution stays unresolved for ambiguous overloads on parent owners', () => {
+        const tree = parse(
+          `
+function process(repo: Repo) {
+  const profile = repo.getProfile();
+}
+`,
+          TypeScript.typescript,
+        );
+        const symbolTable = createSymbolTable();
+        symbolTable.add('models.ts', 'Repo', 'class:Repo', 'Class');
+        symbolTable.add('base.ts', 'BaseRepo', 'class:BaseRepo', 'Class');
+        symbolTable.add('base.ts', 'getProfile', 'method:BaseRepo:getProfile#1', 'Method', {
+          ownerId: 'class:BaseRepo',
+          parameterCount: 1,
+          returnType: 'User',
+        });
+        symbolTable.add('base.ts', 'getProfile', 'method:BaseRepo:getProfile#2', 'Method', {
+          ownerId: 'class:BaseRepo',
+          parameterCount: 2,
+          returnType: 'Admin',
+        });
+        const lookupFuzzyCallable = vi.spyOn(symbolTable, 'lookupFuzzyCallable');
+        const typeEnv = buildTypeEnv(tree, 'typescript', {
+          symbolTable,
+          parentMap: new Map([['Repo', ['BaseRepo']]]),
+        });
+        expect(flatGet(typeEnv, 'profile')).toBeUndefined();
+        expect(lookupFuzzyCallable).not.toHaveBeenCalled();
+      });
     });
 
     describe('Python walrus operator type inference', () => {