diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a105dd492..721c285e6f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed the missing first data point in the portfolio evolution chart on the analysis page
 - Fixed the end date of calendar year date ranges in the portfolio performance calculation for instances in time zones with a negative UTC offset
 - Fixed the missing mapping for Korea in the country weightings of the _Financial Modeling Prep_ service
+- Fixed the alignment of the average price in the chart of the holding detail dialog for custom asset profiles
 
 ## 3.81.0 - 2026-10-07
 
diff --git a/apps/client/src/app/components/holding-detail-dialog/holding-detail-dialog.component.ts b/apps/client/src/app/components/holding-detail-dialog/holding-detail-dialog.component.ts
index 8c3ec2206e..2c3d197c7a 100644
--- a/apps/client/src/app/components/holding-detail-dialog/holding-detail-dialog.component.ts
+++ b/apps/client/src/app/components/holding-detail-dialog/holding-detail-dialog.component.ts
@@ -9,6 +9,7 @@ import {
 } from '@ghostfolio/common/config';
 import { CreateOrderDto } from '@ghostfolio/common/dtos';
 import {
+  alignLineChartItemsToDates,
   DATE_FORMAT,
   downloadAsFile,
   getCountryName
@@ -69,6 +70,7 @@ import { SortDirection } from '@angular/material/sort';
 import { MatTableDataSource } from '@angular/material/table';
 import { MatTabsModule } from '@angular/material/tabs';
 import { NavigationStart, Router, RouterModule } from '@angular/router';
+import { utc } from '@date-fns/utc';
 import { IonIcon } from '@ionic/angular/standalone';
 import { isUUID } from 'class-validator';
 import { format, isSameMonth, isToday, parseISO } from 'date-fns';
@@ -719,12 +721,19 @@ export class GfHoldingDetailDialogComponent implements OnInit {
         this.historicalDataItems = this.marketDataItems.map(
           ({ date, marketPrice }) => {
             return {
-              date: format(date, DATE_FORMAT),
+              date: format(date, DATE_FORMAT, { in: utc }),
               value: marketPrice
             };
           }
         );
 
+        this.benchmarkDataItems = alignLineChartItemsToDates({
+          dates: this.historicalDataItems.map(({ date }) => {
+            return date;
+          }),
+          items: this.benchmarkDataItems
+        });
+
         this.changeDetectorRef.markForCheck();
       });
   }
diff --git a/libs/common/src/lib/helper.spec.ts b/libs/common/src/lib/helper.spec.ts
index 71b934628c..6a0248d810 100644
--- a/libs/common/src/lib/helper.spec.ts
+++ b/libs/common/src/lib/helper.spec.ts
@@ -3,6 +3,7 @@ import {
   TAG_ID_EXCLUDE_FROM_ANALYSIS
 } from '@ghostfolio/common/config';
 import {
+  alignLineChartItemsToDates,
   canApplyFiltersToAccess,
   extractNumberFromString,
   getCountryCodeFromCurrency,
@@ -25,6 +26,66 @@ import {
 import { UserSettings } from '@ghostfolio/common/interfaces';
 
 describe('Helper', () => {
+  describe('Align line chart items to dates', () => {
+    it('Dates before the first item', () => {
+      expect(
+        alignLineChartItemsToDates({
+          dates: ['2025-01-02', '2025-01-03'],
+          items: [{ date: '2026-01-09', value: 100 }]
+        })
+      ).toEqual([
+        { date: '2025-01-02', value: null },
+        { date: '2025-01-03', value: null }
+      ]);
+    });
+
+    it('Dates on and after the items', () => {
+      expect(
+        alignLineChartItemsToDates({
+          dates: [
+            '2026-01-08',
+            '2026-01-09',
+            '2026-01-10',
+            '2026-01-12',
+            '2026-01-13'
+          ],
+          items: [
+            { date: '2026-01-09', value: 100 },
+            { date: '2026-01-12', value: 110 }
+          ]
+        })
+      ).toEqual([
+        { date: '2026-01-08', value: null },
+        { date: '2026-01-09', value: 100 },
+        { date: '2026-01-10', value: 100 },
+        { date: '2026-01-12', value: 110 },
+        { date: '2026-01-13', value: 110 }
+      ]);
+    });
+
+    it('Null values', () => {
+      expect(
+        alignLineChartItemsToDates({
+          dates: ['2026-01-09', '2026-01-10', '2026-01-11'],
+          items: [
+            { date: '2026-01-09', value: 100 },
+            { date: '2026-01-10', value: null }
+          ]
+        })
+      ).toEqual([
+        { date: '2026-01-09', value: 100 },
+        { date: '2026-01-10', value: null },
+        { date: '2026-01-11', value: null }
+      ]);
+    });
+
+    it('No items', () => {
+      expect(
+        alignLineChartItemsToDates({ dates: ['2026-01-09'], items: [] })
+      ).toEqual([{ date: '2026-01-09', value: null }]);
+    });
+  });
+
   describe('Can apply filters to access', () => {
     it('An access of the model context protocol', () => {
       expect(canApplyFiltersToAccess({ type: 'MCP' })).toEqual(false);
diff --git a/libs/common/src/lib/helper.ts b/libs/common/src/lib/helper.ts
index 7e4e13de7e..a355faec99 100644
--- a/libs/common/src/lib/helper.ts
+++ b/libs/common/src/lib/helper.ts
@@ -60,6 +60,7 @@ import {
   AssetProfileIdentifier,
   AssetProfileItem,
   Benchmark,
+  NullableLineChartItem,
   PortfolioPosition,
   UserSettings
 } from './interfaces';
@@ -94,6 +95,27 @@ const USER_SETTINGS_KEYS_OF_AUTHENTICATED_USER: (keyof UserSettings)[] = [
 
 const VALID_COUNTRY_CODES = new Set([...Object.keys(countries), 'EU']);
 
+export function alignLineChartItemsToDates({
+  dates,
+  items
+}: {
+  dates: string[];
+  items: NullableLineChartItem[];
+}): NullableLineChartItem[] {
+  let index = -1;
+
+  return dates.map((date) => {
+    while (
+      index + 1 < items.length &&
+      !isAfter(parseISO(items[index + 1].date), parseISO(date))
+    ) {
+      index++;
+    }
+
+    return { date, value: items[index]?.value ?? null };
+  });
+}
+
 export function applyAssetProfileOverrides<T extends Partial<SymbolProfile>>(
   assetProfile: T,
   assetProfileOverrides: AssetProfileOverrides | null