diff --git a/CHANGELOG.md b/CHANGELOG.md
index d98e93424..f42ab8abc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- Added the quantity to the accounts tab of the holding detail dialog
+
 ### Fixed
 
 - Fixed the allocation in the accounts tab of the holding detail dialog caused by floating-point rounding
diff --git a/apps/api/src/app/portfolio/portfolio.service.spec.ts b/apps/api/src/app/portfolio/portfolio.service.spec.ts
index c5e0a8332..c398d6a28 100644
--- a/apps/api/src/app/portfolio/portfolio.service.spec.ts
+++ b/apps/api/src/app/portfolio/portfolio.service.spec.ts
@@ -426,7 +426,10 @@ describe('PortfolioService', () => {
       return (
         portfolioService as unknown as {
           getValueOfAccountsAndPlatforms: (aArgs: object) => Promise<{
-            accounts: Record<string, { valueInBaseCurrency: number }>;
+            accounts: Record<
+              string,
+              { quantity?: number; valueInBaseCurrency: number }
+            >;
             platforms: Record<string, { valueInBaseCurrency: number }>;
           }>;
         }
@@ -443,6 +446,10 @@ describe('PortfolioService', () => {
     };
 
     beforeEach(() => {
+      jest
+        .spyOn(accountService, 'accounts')
+        .mockResolvedValue([account] as unknown as AccountWithBalance[]);
+
       jest
         .spyOn(accountService, 'getAccounts')
         .mockResolvedValue([account] as unknown as AccountWithBalance[]);
@@ -548,5 +555,56 @@ describe('PortfolioService', () => {
       expect(accounts[account.id].valueInBaseCurrency).toBe(100);
       expect(platforms[account.platformId].valueInBaseCurrency).toBe(100);
     });
+
+    it('should aggregate the quantity per account if the activities are filtered by a single holding', async () => {
+      const { accounts } = await getValueOfAccountsAndPlatforms({
+        activities: [
+          {
+            account,
+            accountId: account.id,
+            assetProfile: { symbol: 'AAPL' },
+            quantity: 0.1,
+            type: 'BUY'
+          },
+          {
+            account,
+            accountId: account.id,
+            assetProfile: { symbol: 'AAPL' },
+            quantity: 0.2,
+            type: 'BUY'
+          }
+        ],
+        filters: [{ id: 'AAPL', type: 'SYMBOL' }],
+        portfolioItemsNow: {
+          AAPL: { marketPriceInBaseCurrency: 10 }
+        },
+        userCurrency: 'USD',
+        userId: userDummyData.id
+      });
+
+      expect(accounts[account.id].quantity).toBe(0.3);
+    });
+
+    it('should not expose a quantity if the activities are not filtered by a single holding', async () => {
+      const { accounts } = await getValueOfAccountsAndPlatforms({
+        activities: [
+          {
+            account,
+            accountId: account.id,
+            assetProfile: { symbol: 'AAPL' },
+            quantity: 1,
+            type: 'BUY'
+          }
+        ],
+        filters: [],
+        portfolioItemsNow: {
+          AAPL: { marketPriceInBaseCurrency: 10 }
+        },
+        userCurrency: 'USD',
+        userId: userDummyData.id
+      });
+
+      expect(accounts[account.id].quantity).toBeUndefined();
+    });
   });
 });
diff --git a/apps/api/src/app/portfolio/portfolio.service.ts b/apps/api/src/app/portfolio/portfolio.service.ts
index 2c7701784..1ec3dd234 100644
--- a/apps/api/src/app/portfolio/portfolio.service.ts
+++ b/apps/api/src/app/portfolio/portfolio.service.ts
@@ -249,6 +249,10 @@ export class PortfolioService {
           }
         }
 
+        const quantityOfHolding = filterBySymbol
+          ? (details.accounts[account.id]?.quantity ?? 0)
+          : undefined;
+
         const valueInBaseCurrency =
           details.accounts[account.id]?.valueInBaseCurrency ?? 0;
 
@@ -264,6 +268,7 @@ export class PortfolioService {
             account.currency,
             userCurrency
           ),
+          quantity: quantityOfHolding,
           value: this.exchangeRateDataService.toCurrency(
             valueInBaseCurrency,
             userCurrency,
@@ -2194,6 +2199,10 @@ export class PortfolioService {
     const accounts: PortfolioDetails['accounts'] = {};
     const platforms: PortfolioDetails['platforms'] = {};
 
+    const { SYMBOL: [filterBySymbol] = [] } = groupBy(filters, ({ type }) => {
+      return type;
+    });
+
     let currentAccounts: (AccountWithBalance & {
       Order?: Order[];
       platform?: Platform;
@@ -2274,23 +2283,33 @@ export class PortfolioService {
         continue;
       }
 
+      let quantityOfAccount = new Big(0);
       let valueOfAccountInBaseCurrency = new Big(0);
 
       for (const { assetProfile, quantity, type } of ordersByAccount) {
+        const currentQuantityOfSymbol = new Big(quantity).mul(getFactor(type));
+
+        quantityOfAccount = quantityOfAccount.plus(currentQuantityOfSymbol);
+
         valueOfAccountInBaseCurrency = valueOfAccountInBaseCurrency.plus(
-          new Big(quantity)
-            .mul(getFactor(type))
-            .mul(
-              portfolioItemsNow[assetProfile.symbol]
-                ?.marketPriceInBaseCurrency ?? 0
-            )
+          currentQuantityOfSymbol.mul(
+            portfolioItemsNow[assetProfile.symbol]?.marketPriceInBaseCurrency ??
+              0
+          )
         );
       }
 
       const currentAccountId = account?.id || UNKNOWN_KEY;
       const currentPlatformId = account?.platformId || UNKNOWN_KEY;
 
+      // The quantity is only meaningful if the activities are filtered by a
+      // single holding
+      const quantityOfHolding = filterBySymbol
+        ? quantityOfAccount.toNumber()
+        : undefined;
+
       if (accounts[currentAccountId]) {
+        accounts[currentAccountId].quantity = quantityOfHolding;
         accounts[currentAccountId].valueInBaseCurrency = new Big(
           accounts[currentAccountId].valueInBaseCurrency
         )
@@ -2301,6 +2320,7 @@ export class PortfolioService {
           balance: 0,
           currency: account?.currency,
           name: account?.name,
+          quantity: quantityOfHolding,
           valueInBaseCurrency: valueOfAccountInBaseCurrency.toNumber()
         };
       }
diff --git a/apps/client/src/app/components/holding-detail-dialog/holding-detail-dialog.html b/apps/client/src/app/components/holding-detail-dialog/holding-detail-dialog.html
index 8292ff598..041a93e6e 100644
--- a/apps/client/src/app/components/holding-detail-dialog/holding-detail-dialog.html
+++ b/apps/client/src/app/components/holding-detail-dialog/holding-detail-dialog.html
@@ -418,6 +418,7 @@
           [showAllocationInPercentage]="user?.settings?.isExperimentalFeatures"
           [showBalance]="false"
           [showFooter]="false"
+          [showQuantity]="true"
           [showValue]="false"
           [showValueInBaseCurrency]="false"
         />
diff --git a/libs/common/src/lib/config.ts b/libs/common/src/lib/config.ts
index 761f7c3ed..265e27690 100644
--- a/libs/common/src/lib/config.ts
+++ b/libs/common/src/lib/config.ts
@@ -113,6 +113,7 @@ export const DEFAULT_REDACTED_PATHS = [
   'accounts[*].comment',
   'accounts[*].dividendInBaseCurrency',
   'accounts[*].interestInBaseCurrency',
+  'accounts[*].quantity',
   'accounts[*].value',
   'accounts[*].valueInBaseCurrency',
   'activities[*].account.comment',
diff --git a/libs/common/src/lib/interfaces/portfolio-details.interface.ts b/libs/common/src/lib/interfaces/portfolio-details.interface.ts
index 746736f6b..15a07f671 100644
--- a/libs/common/src/lib/interfaces/portfolio-details.interface.ts
+++ b/libs/common/src/lib/interfaces/portfolio-details.interface.ts
@@ -10,6 +10,8 @@ export interface PortfolioDetails {
       balance: number;
       currency: string;
       name: string;
+      /** Only set if the activities are filtered by a single holding */
+      quantity?: number;
       valueInBaseCurrency: number;
       valueInPercentage?: number;
     };
diff --git a/libs/common/src/lib/types/account-with-value.type.ts b/libs/common/src/lib/types/account-with-value.type.ts
index 27b7541dc..0d43c612f 100644
--- a/libs/common/src/lib/types/account-with-value.type.ts
+++ b/libs/common/src/lib/types/account-with-value.type.ts
@@ -9,6 +9,8 @@ export type AccountWithValue = AccountWithBalance & {
   dividendInBaseCurrency: number;
   interestInBaseCurrency: number;
   platform?: Platform;
+  /** Only set if the accounts are filtered by a single holding */
+  quantity?: number;
   tags?: Tag[];
   value: number;
   valueInBaseCurrency: number;
diff --git a/libs/ui/src/lib/accounts-table/accounts-table.component.html b/libs/ui/src/lib/accounts-table/accounts-table.component.html
index b6e0d846c..0b4bb72ce 100644
--- a/libs/ui/src/lib/accounts-table/accounts-table.component.html
+++ b/libs/ui/src/lib/accounts-table/accounts-table.component.html
@@ -131,6 +131,26 @@
       </td>
     </ng-container>
 
+    <ng-container matColumnDef="quantity">
+      <th
+        *matHeaderCellDef
+        class="justify-content-end px-1"
+        mat-header-cell
+        mat-sort-header
+      >
+        <ng-container i18n>Quantity</ng-container>
+      </th>
+      <td *matCellDef="let element" class="px-1 text-right" mat-cell>
+        <gf-value
+          class="d-inline-block justify-content-end"
+          [isCurrency]="true"
+          [locale]="locale()"
+          [value]="element.quantity"
+        />
+      </td>
+      <td *matFooterCellDef class="px-1" mat-footer-cell></td>
+    </ng-container>
+
     <ng-container matColumnDef="balance">
       <th
         *matHeaderCellDef
diff --git a/libs/ui/src/lib/accounts-table/accounts-table.component.ts b/libs/ui/src/lib/accounts-table/accounts-table.component.ts
index bed57e4ca..54bfbf8be 100644
--- a/libs/ui/src/lib/accounts-table/accounts-table.component.ts
+++ b/libs/ui/src/lib/accounts-table/accounts-table.component.ts
@@ -66,6 +66,7 @@ export class GfAccountsTableComponent {
   public readonly showAllocationInPercentage = input<boolean>();
   public readonly showBalance = input(true);
   public readonly showFooter = input(true);
+  public readonly showQuantity = input<boolean>();
   public readonly showValue = input(true);
   public readonly showValueInBaseCurrency = input(true);
   public readonly totalBalanceInBaseCurrency = input<number>();
@@ -103,6 +104,10 @@ export class GfAccountsTableComponent {
       columns.push('activitiesCount');
     }
 
+    if (this.showQuantity()) {
+      columns.push('quantity');
+    }
+
     if (this.showBalance()) {
       columns.push('balance');
     }