diff --git a/apps/client/src/app/services/import-activities.service.spec.ts b/apps/client/src/app/services/import-activities.service.spec.ts
new file mode 100644
index 0000000000..847f67d8b6
--- /dev/null
+++ b/apps/client/src/app/services/import-activities.service.spec.ts
@@ -0,0 +1,106 @@
+import { HttpClient } from '@angular/common/http';
+import { TestBed } from '@angular/core/testing';
+import { of } from 'rxjs';
+
+import { ImportActivitiesService } from './import-activities.service';
+
+jest.mock('uuid', () => ({
+  v4: () => '00000000-0000-4000-8000-000000000001'
+}));
+
+describe('ImportActivitiesService', () => {
+  let service: ImportActivitiesService;
+  let post: jest.Mock;
+
+  beforeEach(() => {
+    post = jest.fn().mockImplementation((_url, { activities }) => {
+      return of({ activities });
+    });
+
+    TestBed.configureTestingModule({
+      providers: [
+        ImportActivitiesService,
+        { provide: HttpClient, useValue: { post } }
+      ]
+    });
+
+    service = TestBed.inject(ImportActivitiesService);
+  });
+
+  describe('importCsv', () => {
+    it.each(['Symbol', 'CODE', 'ticker'])(
+      'preserves leading zeroes in the %s column',
+      async (symbolColumn) => {
+        await service.importCsv({
+          fileContent: `${symbolColumn},currency,date,type,quantity,unitPrice,fee\n"0005",HKD,2026-01-02,BUY,10,3.12,-0.5`,
+          isDryRun: true,
+          userAccounts: []
+        });
+
+        expect(post).toHaveBeenCalledWith(
+          '/api/v1/import?dryRun=true',
+          expect.objectContaining({
+            activities: [
+              expect.objectContaining({
+                currency: 'HKD',
+                date: new Date(2026, 0, 2).toISOString(),
+                fee: 0.5,
+                quantity: 10,
+                symbol: '0005',
+                type: 'BUY',
+                unitPrice: 3.12
+              })
+            ]
+          })
+        );
+      }
+    );
+
+    it.each(['639', '000000', '1E3', 'TRUE', 'FALSE', 'AAPL', '0639.HK'])(
+      'preserves the symbol %s without CSV type coercion',
+      async (symbol) => {
+        await service.importCsv({
+          fileContent: `symbol,currency,date,type,quantity,unitPrice,fee\n${symbol},USD,2026-01-02,BUY,1,10,0`,
+          userAccounts: []
+        });
+
+        expect(post.mock.calls[0][1].activities[0].symbol).toBe(symbol);
+      }
+    );
+
+    it.each(['', '""'])(
+      'rejects an empty symbol (%s) before posting the import',
+      async (symbol) => {
+        await expect(
+          service.importCsv({
+            fileContent: `symbol,currency,date,type,quantity,unitPrice,fee\n${symbol},USD,2026-01-02,BUY,1,10,0`,
+            userAccounts: []
+          })
+        ).rejects.toMatchObject({
+          message: 'activities.0.symbol is not valid'
+        });
+
+        expect(post).not.toHaveBeenCalled();
+      }
+    );
+
+    it('preserves numeric names when creating a manual asset profile', async () => {
+      const result = await service.importCsv({
+        fileContent:
+          'symbol,dataSource,currency,date,type,quantity,unitPrice,fee\n0005,MANUAL,HKD,2026-01-02,BUY,10,3.12,0',
+        userAccounts: []
+      });
+
+      expect(result.assetProfiles).toEqual([
+        expect.objectContaining({
+          dataSource: 'MANUAL',
+          name: '0005',
+          symbol: '00000000-0000-4000-8000-000000000001'
+        })
+      ]);
+      expect(post.mock.calls[0][1].activities[0].symbol).toBe(
+        result.assetProfiles[0].symbol
+      );
+    });
+  });
+});
diff --git a/apps/client/src/app/services/import-activities.service.ts b/apps/client/src/app/services/import-activities.service.ts
index 06ca922c1f..7527489338 100644
--- a/apps/client/src/app/services/import-activities.service.ts
+++ b/apps/client/src/app/services/import-activities.service.ts
@@ -66,7 +66,11 @@ export class ImportActivitiesService {
     assetProfiles: CreateAssetProfileWithMarketDataDto[];
   }> {
     const content = csvToJson<Record<string, unknown>>(fileContent, {
-      dynamicTyping: true,
+      dynamicTyping: (field: string) => {
+        return !ImportActivitiesService.SYMBOL_KEYS.includes(
+          field.toLowerCase()
+        );
+      },
       header: true,
       skipEmptyLines: true
     }).data;
@@ -420,7 +424,7 @@ export class ImportActivitiesService {
     for (const key of ImportActivitiesService.SYMBOL_KEYS) {
       const value = item[key];
 
-      if (isNumber(value) || isString(value)) {
+      if (isNumber(value) || (isString(value) && value.length > 0)) {
         return String(value);
       }
     }