diff --git a/CHANGELOG.md b/CHANGELOG.md
index 736c708e2..597829790 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Handled an exception in the country weightings parsing of the _Financial Modeling Prep_ service
 
+### Fixed
+
+- Fixed the allocation percentages in the accounts section of the holding detail dialog by excluding the cash balances
+
 ## 3.42.0 - 2026-08-04
 
 ### Changed
diff --git a/apps/api/src/app/portfolio/portfolio.service.spec.ts b/apps/api/src/app/portfolio/portfolio.service.spec.ts
index 97635553f..20d7c4c9d 100644
--- a/apps/api/src/app/portfolio/portfolio.service.spec.ts
+++ b/apps/api/src/app/portfolio/portfolio.service.spec.ts
@@ -509,5 +509,36 @@ describe('PortfolioService', () => {
       expect(accounts[UNKNOWN_KEY]).toBeUndefined();
       expect(platforms[UNKNOWN_KEY]).toBeUndefined();
     });
+
+    it('should exclude the cash balance when filtering by a holding', async () => {
+      jest
+        .spyOn(accountService, 'accounts')
+        .mockResolvedValue([account] as unknown as Account[]);
+
+      const { accounts, platforms } = await getValueOfAccountsAndPlatforms({
+        activities: [
+          {
+            account,
+            accountId: account.id,
+            assetProfile: { symbol: 'AAPL' },
+            quantity: 1,
+            type: 'BUY'
+          }
+        ],
+        filters: [
+          { id: DataSource.YAHOO, type: 'DATA_SOURCE' },
+          { id: 'AAPL', type: 'SYMBOL' }
+        ],
+        portfolioItemsNow: {
+          AAPL: { marketPriceInBaseCurrency: 10 }
+        },
+        userCurrency: 'USD',
+        userId: userDummyData.id
+      });
+
+      // 1 * 10 (activity), without the balance of 100
+      expect(accounts[account.id].valueInBaseCurrency).toBe(10);
+      expect(platforms[account.platformId].valueInBaseCurrency).toBe(10);
+    });
   });
 });
diff --git a/apps/api/src/app/portfolio/portfolio.service.ts b/apps/api/src/app/portfolio/portfolio.service.ts
index 70106bdc1..784749505 100644
--- a/apps/api/src/app/portfolio/portfolio.service.ts
+++ b/apps/api/src/app/portfolio/portfolio.service.ts
@@ -2142,6 +2142,15 @@ export class PortfolioService {
     const accounts: PortfolioDetails['accounts'] = {};
     const platforms: PortfolioDetails['platforms'] = {};
 
+    const {
+      DATA_SOURCE: [filterByDataSource] = [],
+      SYMBOL: [filterBySymbol] = []
+    } = groupBy(filters, ({ type }) => {
+      return type;
+    });
+
+    const isFilteredByHolding = !!(filterByDataSource && filterBySymbol);
+
     let currentAccounts: (Account & {
       Order?: Order[];
       platform?: Platform;
@@ -2185,7 +2194,9 @@ export class PortfolioService {
         return account ? accountId === account.id : !accountId;
       });
 
-      if (account) {
+      // Skip the cash balance if the request is filtered by a holding, so that
+      // the values of the accounts and platforms reflect this holding only
+      if (account && !isFilteredByHolding) {
         accounts[account.id] = {
           balance: account.balance,
           currency: account.currency,