diff --git a/apps/api/src/app/activities/activities.module.ts b/apps/api/src/app/activities/activities.module.ts
index 661163ff1..6b8f5ecfa 100644
--- a/apps/api/src/app/activities/activities.module.ts
+++ b/apps/api/src/app/activities/activities.module.ts
@@ -6,6 +6,7 @@ import { RedactValuesInResponseModule } from '@ghostfolio/api/interceptors/redac
 import { TransformDataSourceInRequestModule } from '@ghostfolio/api/interceptors/transform-data-source-in-request/transform-data-source-in-request.module';
 import { TransformDataSourceInResponseModule } from '@ghostfolio/api/interceptors/transform-data-source-in-response/transform-data-source-in-response.module';
 import { ApiModule } from '@ghostfolio/api/services/api/api.module';
+import { AssetProfileSplitModule } from '@ghostfolio/api/services/asset-profile-split/asset-profile-split.module';
 import { BenchmarkModule } from '@ghostfolio/api/services/benchmark/benchmark.module';
 import { DataProviderModule } from '@ghostfolio/api/services/data-provider/data-provider.module';
 import { ExchangeRateDataModule } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.module';
@@ -25,6 +26,7 @@ import { ActivitiesService } from './activities.service';
   exports: [ActivitiesService],
   imports: [
     ApiModule,
+    AssetProfileSplitModule,
     BenchmarkModule,
     CacheModule,
     DataGatheringQueueModule,
diff --git a/apps/api/src/app/activities/activities.service.ts b/apps/api/src/app/activities/activities.service.ts
index b404b6a37..5fdcbedde 100644
--- a/apps/api/src/app/activities/activities.service.ts
+++ b/apps/api/src/app/activities/activities.service.ts
@@ -4,7 +4,9 @@ import { CashDetails } from '@ghostfolio/api/app/account/interfaces/cash-details
 import { AssetProfileChangedEvent } from '@ghostfolio/api/events/asset-profile-changed.event';
 import { PortfolioChangedEvent } from '@ghostfolio/api/events/portfolio-changed.event';
 import { WHERE_ACCOUNT_NOT_EXCLUDED } from '@ghostfolio/api/helper/account.helper';
+import { applySplitAdjustments } from '@ghostfolio/api/helper/portfolio.helper';
 import { LogPerformance } from '@ghostfolio/api/interceptors/performance-logging/performance-logging.interceptor';
+import { AssetProfileSplitService } from '@ghostfolio/api/services/asset-profile-split/asset-profile-split.service';
 import { BenchmarkService } from '@ghostfolio/api/services/benchmark/benchmark.service';
 import { DataProviderService } from '@ghostfolio/api/services/data-provider/data-provider.service';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
@@ -54,6 +56,7 @@ export class ActivitiesService {
   public constructor(
     private readonly accountBalanceService: AccountBalanceService,
     private readonly accountService: AccountService,
+    private readonly assetProfileSplitService: AssetProfileSplitService,
     private readonly benchmarkService: BenchmarkService,
     private readonly dataGatheringService: DataGatheringService,
     private readonly dataProviderService: DataProviderService,
@@ -863,6 +866,25 @@ export class ActivitiesService {
       withExcludedAccountsAndActivities: false // TODO
     });
 
+    const splits = await this.assetProfileSplitService.getSplits({
+      assetProfileIdentifiers: uniqBy(
+        activities.activities.map(({ SymbolProfile }) => {
+          return {
+            dataSource: SymbolProfile.dataSource,
+            symbol: SymbolProfile.symbol
+          };
+        }),
+        ({ dataSource, symbol }) => {
+          return getAssetProfileIdentifier({ dataSource, symbol });
+        }
+      )
+    });
+
+    activities.activities = applySplitAdjustments({
+      splits,
+      activities: activities.activities
+    });
+
     if (withCash && !this.areCashActivitiesExcludedByFilters(filters)) {
       const cashDetails = await this.accountService.getCashDetails({
         filters,
diff --git a/apps/api/src/app/admin/admin.module.ts b/apps/api/src/app/admin/admin.module.ts
index 2d5c734dc..b14ab81f5 100644
--- a/apps/api/src/app/admin/admin.module.ts
+++ b/apps/api/src/app/admin/admin.module.ts
@@ -1,4 +1,5 @@
 import { TransformDataSourceInRequestModule } from '@ghostfolio/api/interceptors/transform-data-source-in-request/transform-data-source-in-request.module';
+import { AssetProfileSplitModule } from '@ghostfolio/api/services/asset-profile-split/asset-profile-split.module';
 import { BenchmarkModule } from '@ghostfolio/api/services/benchmark/benchmark.module';
 import { ConfigurationModule } from '@ghostfolio/api/services/configuration/configuration.module';
 import { DataProviderModule } from '@ghostfolio/api/services/data-provider/data-provider.module';
@@ -18,6 +19,7 @@ import { QueueModule } from './queue/queue.module';
 
 @Module({
   imports: [
+    AssetProfileSplitModule,
     BenchmarkModule,
     ConfigurationModule,
     DataGatheringQueueModule,
diff --git a/apps/api/src/app/admin/admin.service.ts b/apps/api/src/app/admin/admin.service.ts
index e6f5fd700..70502ce0d 100644
--- a/apps/api/src/app/admin/admin.service.ts
+++ b/apps/api/src/app/admin/admin.service.ts
@@ -1,4 +1,5 @@
 import { environment } from '@ghostfolio/api/environments/environment';
+import { AssetProfileSplitService } from '@ghostfolio/api/services/asset-profile-split/asset-profile-split.service';
 import { ConfigurationService } from '@ghostfolio/api/services/configuration/configuration.service';
 import { DataProviderService } from '@ghostfolio/api/services/data-provider/data-provider.service';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
@@ -43,6 +44,7 @@ import { StatusCodes, getReasonPhrase } from 'http-status-codes';
 @Injectable()
 export class AdminService {
   public constructor(
+    private readonly assetProfileSplitService: AssetProfileSplitService,
     private readonly configurationService: ConfigurationService,
     private readonly dataProviderService: DataProviderService,
     private readonly exchangeRateDataService: ExchangeRateDataService,
@@ -102,6 +104,7 @@ export class AdminService {
     dataSource,
     symbol
   }: AssetProfileIdentifier) {
+    await this.assetProfileSplitService.deleteMany({ dataSource, symbol });
     await this.marketDataService.deleteMany({ dataSource, symbol });
 
     const currency = getCurrencyFromSymbol(symbol);
@@ -280,6 +283,16 @@ export class AdminService {
               dataSource: DataSource[newDataSource.toString()],
               symbol: newSymbol as string
             }
+          ),
+          this.assetProfileSplitService.updateAssetProfileIdentifier(
+            {
+              dataSource,
+              symbol
+            },
+            {
+              dataSource: DataSource[newDataSource.toString()],
+              symbol: newSymbol as string
+            }
           )
         ]);
 
diff --git a/apps/api/src/app/asset/asset.controller.ts b/apps/api/src/app/asset/asset.controller.ts
index de04b5c81..49afb43d7 100644
--- a/apps/api/src/app/asset/asset.controller.ts
+++ b/apps/api/src/app/asset/asset.controller.ts
@@ -20,7 +20,7 @@ export class AssetController {
     @Param('dataSource') dataSource: DataSource,
     @Param('symbol') symbol: string
   ): Promise<AssetResponse> {
-    const { assetProfile, marketData } =
+    const { assetProfile, marketData, splits } =
       await this.assetProfilesService.getAssetProfile({
         dataSource,
         symbol
@@ -28,6 +28,7 @@ export class AssetController {
 
     return {
       marketData,
+      splits,
       assetProfile: pick(assetProfile, ['dataSource', 'name', 'symbol'])
     };
   }
diff --git a/apps/api/src/app/endpoints/asset-profiles/asset-profiles.controller.ts b/apps/api/src/app/endpoints/asset-profiles/asset-profiles.controller.ts
index d74f167a6..f5e032196 100644
--- a/apps/api/src/app/endpoints/asset-profiles/asset-profiles.controller.ts
+++ b/apps/api/src/app/endpoints/asset-profiles/asset-profiles.controller.ts
@@ -4,7 +4,10 @@ import { TransformDataSourceInRequestInterceptor } from '@ghostfolio/api/interce
 import { TransformDataSourceInResponseInterceptor } from '@ghostfolio/api/interceptors/transform-data-source-in-response/transform-data-source-in-response.interceptor';
 import { ApiService } from '@ghostfolio/api/services/api/api.service';
 import { SymbolProfileService } from '@ghostfolio/api/services/symbol-profile/symbol-profile.service';
-import { UpdateAssetProfileDataDto } from '@ghostfolio/common/dtos';
+import {
+  CreateAssetProfileSplitDto,
+  UpdateAssetProfileDataDto
+} from '@ghostfolio/common/dtos';
 import { getCurrencyFromSymbol, isCurrency } from '@ghostfolio/common/helper';
 import { AssetProfileResponse } from '@ghostfolio/common/interfaces';
 import {
@@ -18,19 +21,22 @@ import { MarketDataPreset, RequestWithUser } from '@ghostfolio/common/types';
 import {
   Body,
   Controller,
+  Delete,
   Get,
   HttpException,
   Inject,
   Param,
   ParseIntPipe,
   Patch,
+  Post,
   Query,
   UseGuards,
   UseInterceptors
 } from '@nestjs/common';
 import { REQUEST } from '@nestjs/core';
 import { AuthGuard } from '@nestjs/passport';
-import { DataSource, Prisma } from '@prisma/client';
+import { AssetProfileSplit, DataSource, Prisma } from '@prisma/client';
+import { parseISO } from 'date-fns';
 import { StatusCodes, getReasonPhrase } from 'http-status-codes';
 
 import { AssetProfilesService } from './asset-profiles.service';
@@ -119,6 +125,37 @@ export class AssetProfilesController {
     });
   }
 
+  @Post(':dataSource/:symbol/splits')
+  @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInRequestInterceptor)
+  public async createSplit(
+    @Body() data: CreateAssetProfileSplitDto,
+    @Param('dataSource') dataSource: DataSource,
+    @Param('symbol') symbol: string
+  ): Promise<AssetProfileSplit> {
+    await this.validateCanManageSplits({ dataSource, symbol });
+
+    return this.assetProfilesService.createSplit({
+      dataSource,
+      symbol,
+      date: parseISO(data.date),
+      factor: data.factor
+    });
+  }
+
+  @Delete(':dataSource/:symbol/splits/:id')
+  @UseGuards(AuthGuard('jwt'))
+  @UseInterceptors(TransformDataSourceInRequestInterceptor)
+  public async deleteSplit(
+    @Param('dataSource') dataSource: DataSource,
+    @Param('id') id: string,
+    @Param('symbol') symbol: string
+  ): Promise<void> {
+    await this.validateCanManageSplits({ dataSource, symbol });
+
+    return this.assetProfilesService.deleteSplit({ dataSource, id, symbol });
+  }
+
   @HasPermission(permissions.accessAdminControl)
   @Patch(':dataSource/:symbol')
   @UseGuards(AuthGuard('jwt'), HasPermissionGuard)
@@ -139,4 +176,51 @@ export class AssetProfilesController {
       assetProfileData
     );
   }
+
+  private async validateCanManageSplits({
+    dataSource,
+    symbol
+  }: {
+    dataSource: DataSource;
+    symbol: string;
+  }) {
+    const [assetProfile] = await this.symbolProfileService.getSymbolProfiles([
+      { dataSource, symbol }
+    ]);
+
+    if (!assetProfile) {
+      throw new HttpException(
+        getReasonPhrase(StatusCodes.NOT_FOUND),
+        StatusCodes.NOT_FOUND
+      );
+    }
+
+    const canManageAllAssetProfiles =
+      hasPermission(
+        this.request.user.permissions,
+        permissions.createMarketData
+      ) &&
+      hasPermission(
+        this.request.user.permissions,
+        permissions.updateMarketData
+      );
+
+    const canManageOwnAssetProfile =
+      assetProfile.userId === this.request.user.id &&
+      hasPermission(
+        this.request.user.permissions,
+        permissions.createMarketDataOfOwnAssetProfile
+      ) &&
+      hasPermission(
+        this.request.user.permissions,
+        permissions.updateMarketDataOfOwnAssetProfile
+      );
+
+    if (!canManageAllAssetProfiles && !canManageOwnAssetProfile) {
+      throw new HttpException(
+        getReasonPhrase(StatusCodes.FORBIDDEN),
+        StatusCodes.FORBIDDEN
+      );
+    }
+  }
 }
diff --git a/apps/api/src/app/endpoints/asset-profiles/asset-profiles.module.ts b/apps/api/src/app/endpoints/asset-profiles/asset-profiles.module.ts
index f96d92eb3..98cfde3f9 100644
--- a/apps/api/src/app/endpoints/asset-profiles/asset-profiles.module.ts
+++ b/apps/api/src/app/endpoints/asset-profiles/asset-profiles.module.ts
@@ -1,7 +1,9 @@
 import { ActivitiesModule } from '@ghostfolio/api/app/activities/activities.module';
+import { RedisCacheModule } from '@ghostfolio/api/app/redis-cache/redis-cache.module';
 import { TransformDataSourceInRequestModule } from '@ghostfolio/api/interceptors/transform-data-source-in-request/transform-data-source-in-request.module';
 import { TransformDataSourceInResponseModule } from '@ghostfolio/api/interceptors/transform-data-source-in-response/transform-data-source-in-response.module';
 import { ApiModule } from '@ghostfolio/api/services/api/api.module';
+import { AssetProfileSplitModule } from '@ghostfolio/api/services/asset-profile-split/asset-profile-split.module';
 import { BenchmarkModule } from '@ghostfolio/api/services/benchmark/benchmark.module';
 import { DataProviderModule } from '@ghostfolio/api/services/data-provider/data-provider.module';
 import { ExchangeRateDataModule } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.module';
@@ -20,11 +22,13 @@ import { AssetProfilesService } from './asset-profiles.service';
   imports: [
     ActivitiesModule,
     ApiModule,
+    AssetProfileSplitModule,
     BenchmarkModule,
     DataProviderModule,
     ExchangeRateDataModule,
     MarketDataModule,
     PrismaModule,
+    RedisCacheModule,
     SymbolProfileModule,
     TransformDataSourceInRequestModule,
     TransformDataSourceInResponseModule
diff --git a/apps/api/src/app/endpoints/asset-profiles/asset-profiles.service.ts b/apps/api/src/app/endpoints/asset-profiles/asset-profiles.service.ts
index 68b8d5627..66ecc2aff 100644
--- a/apps/api/src/app/endpoints/asset-profiles/asset-profiles.service.ts
+++ b/apps/api/src/app/endpoints/asset-profiles/asset-profiles.service.ts
@@ -1,4 +1,6 @@
 import { ActivitiesService } from '@ghostfolio/api/app/activities/activities.service';
+import { RedisCacheService } from '@ghostfolio/api/app/redis-cache/redis-cache.service';
+import { AssetProfileSplitService } from '@ghostfolio/api/services/asset-profile-split/asset-profile-split.service';
 import { BenchmarkService } from '@ghostfolio/api/services/benchmark/benchmark.service';
 import { DataProviderService } from '@ghostfolio/api/services/data-provider/data-provider.service';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
@@ -30,14 +32,50 @@ import { groupBy } from 'lodash';
 export class AssetProfilesService {
   public constructor(
     private readonly activitiesService: ActivitiesService,
+    private readonly assetProfileSplitService: AssetProfileSplitService,
     private readonly benchmarkService: BenchmarkService,
     private readonly dataProviderService: DataProviderService,
     private readonly exchangeRateDataService: ExchangeRateDataService,
     private readonly marketDataService: MarketDataService,
     private readonly prismaService: PrismaService,
+    private readonly redisCacheService: RedisCacheService,
     private readonly symbolProfileService: SymbolProfileService
   ) {}
 
+  public async createSplit({
+    dataSource,
+    date,
+    factor,
+    symbol
+  }: AssetProfileIdentifier & { date: Date; factor: number }) {
+    const split = await this.assetProfileSplitService.upsert({
+      dataSource,
+      date,
+      factor,
+      symbol
+    });
+
+    await this.invalidatePortfolioSnapshotsOfUsersWithActivities({
+      dataSource,
+      symbol
+    });
+
+    return split;
+  }
+
+  public async deleteSplit({
+    dataSource,
+    id,
+    symbol
+  }: AssetProfileIdentifier & { id: string }) {
+    await this.assetProfileSplitService.deleteById({ dataSource, id, symbol });
+
+    await this.invalidatePortfolioSnapshotsOfUsersWithActivities({
+      dataSource,
+      symbol
+    });
+  }
+
   public async getAssetProfile({
     dataSource,
     symbol
@@ -54,7 +92,7 @@ export class AssetProfilesService {
         await this.activitiesService.getStatisticsByCurrency(currency));
     }
 
-    const [[assetProfile], marketData] = await Promise.all([
+    const [[assetProfile], marketData, splits] = await Promise.all([
       this.symbolProfileService.getSymbolProfiles([
         {
           dataSource,
@@ -69,6 +107,9 @@ export class AssetProfilesService {
           dataSource,
           symbol
         }
+      }),
+      this.assetProfileSplitService.getSplits({
+        assetProfileIdentifiers: [{ dataSource, symbol }]
       })
     ]);
 
@@ -80,6 +121,7 @@ export class AssetProfilesService {
 
     return {
       marketData,
+      splits,
       assetProfile: assetProfile ?? {
         activitiesCount,
         currency,
@@ -535,4 +577,27 @@ export class AssetProfilesService {
 
     return this.prismaService.$extends(symbolProfileExtension);
   }
+
+  private async invalidatePortfolioSnapshotsOfUsersWithActivities({
+    dataSource,
+    symbol
+  }: AssetProfileIdentifier) {
+    const usersWithActivities = await this.prismaService.order.groupBy({
+      by: ['userId'],
+      where: {
+        SymbolProfile: {
+          dataSource,
+          symbol
+        }
+      }
+    });
+
+    await Promise.all(
+      usersWithActivities.map(({ userId }) => {
+        return this.redisCacheService.removePortfolioSnapshotsByUserId({
+          userId
+        });
+      })
+    );
+  }
 }
diff --git a/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-cash.spec.ts b/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-cash.spec.ts
index 7774ee629..1c5e2ec43 100644
--- a/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-cash.spec.ts
+++ b/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-cash.spec.ts
@@ -7,6 +7,7 @@ import { CurrentRateService } from '@ghostfolio/api/app/portfolio/current-rate.s
 import { CurrentRateServiceMock } from '@ghostfolio/api/app/portfolio/current-rate.service.mock';
 import { RedisCacheService } from '@ghostfolio/api/app/redis-cache/redis-cache.service';
 import { RedisCacheServiceMock } from '@ghostfolio/api/app/redis-cache/redis-cache.service.mock';
+import { AssetProfileSplitService } from '@ghostfolio/api/services/asset-profile-split/asset-profile-split.service';
 import { ConfigurationService } from '@ghostfolio/api/services/configuration/configuration.service';
 import { DataProviderService } from '@ghostfolio/api/services/data-provider/data-provider.service';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
@@ -115,6 +116,7 @@ describe('PortfolioCalculator', () => {
     activitiesService = new ActivitiesService(
       accountBalanceService,
       accountService,
+      new AssetProfileSplitService(null),
       null,
       null,
       dataProviderService,
diff --git a/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-nvda-buy-with-split-and-sell.spec.ts b/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-nvda-buy-with-split-and-sell.spec.ts
new file mode 100644
index 000000000..fedc36da4
--- /dev/null
+++ b/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-nvda-buy-with-split-and-sell.spec.ts
@@ -0,0 +1,188 @@
+import {
+  activityDummyData,
+  loadExportFile,
+  symbolProfileDummyData,
+  userDummyData
+} from '@ghostfolio/api/app/portfolio/calculator/portfolio-calculator-test-utils';
+import { PortfolioCalculatorFactory } from '@ghostfolio/api/app/portfolio/calculator/portfolio-calculator.factory';
+import { CurrentRateService } from '@ghostfolio/api/app/portfolio/current-rate.service';
+import { CurrentRateServiceMock } from '@ghostfolio/api/app/portfolio/current-rate.service.mock';
+import { RedisCacheService } from '@ghostfolio/api/app/redis-cache/redis-cache.service';
+import { RedisCacheServiceMock } from '@ghostfolio/api/app/redis-cache/redis-cache.service.mock';
+import { applySplitAdjustments } from '@ghostfolio/api/helper/portfolio.helper';
+import { ConfigurationService } from '@ghostfolio/api/services/configuration/configuration.service';
+import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
+import { PortfolioSnapshotService } from '@ghostfolio/api/services/queues/portfolio-snapshot/portfolio-snapshot.service';
+import { PortfolioSnapshotServiceMock } from '@ghostfolio/api/services/queues/portfolio-snapshot/portfolio-snapshot.service.mock';
+import { parseDate } from '@ghostfolio/common/helper';
+import { Activity, ExportResponse } from '@ghostfolio/common/interfaces';
+import { PerformanceCalculationType } from '@ghostfolio/common/types/performance-calculation-type.type';
+
+import { Big } from 'big.js';
+import { join } from 'node:path';
+
+jest.mock('@ghostfolio/api/app/portfolio/current-rate.service', () => {
+  return {
+    CurrentRateService: jest.fn().mockImplementation(() => {
+      return CurrentRateServiceMock;
+    })
+  };
+});
+
+jest.mock(
+  '@ghostfolio/api/services/queues/portfolio-snapshot/portfolio-snapshot.service',
+  () => {
+    return {
+      PortfolioSnapshotService: jest.fn().mockImplementation(() => {
+        return PortfolioSnapshotServiceMock;
+      })
+    };
+  }
+);
+
+jest.mock('@ghostfolio/api/app/redis-cache/redis-cache.service', () => {
+  return {
+    RedisCacheService: jest.fn().mockImplementation(() => {
+      return RedisCacheServiceMock;
+    })
+  };
+});
+
+describe('PortfolioCalculator', () => {
+  let exportResponse: ExportResponse;
+
+  let configurationService: ConfigurationService;
+  let currentRateService: CurrentRateService;
+  let exchangeRateDataService: ExchangeRateDataService;
+  let portfolioCalculatorFactory: PortfolioCalculatorFactory;
+  let portfolioSnapshotService: PortfolioSnapshotService;
+  let redisCacheService: RedisCacheService;
+
+  beforeAll(() => {
+    exportResponse = loadExportFile(
+      join(
+        __dirname,
+        '../../../../../../../test/import/ok/nvda-buy-with-split-and-sell.json'
+      )
+    );
+  });
+
+  beforeEach(() => {
+    configurationService = new ConfigurationService();
+
+    currentRateService = new CurrentRateService(null, null, null, null);
+
+    exchangeRateDataService = new ExchangeRateDataService(
+      null,
+      null,
+      null,
+      null
+    );
+
+    portfolioSnapshotService = new PortfolioSnapshotService(null, null);
+
+    redisCacheService = new RedisCacheService(null, null);
+
+    portfolioCalculatorFactory = new PortfolioCalculatorFactory(
+      configurationService,
+      currentRateService,
+      exchangeRateDataService,
+      portfolioSnapshotService,
+      redisCacheService
+    );
+  });
+
+  describe('get current positions', () => {
+    it.only('with NVDA buy (before a 10:1 split) and sell', async () => {
+      jest.useFakeTimers().setSystemTime(parseDate('2024-06-14').getTime());
+
+      const activities: Activity[] = exportResponse.activities.map(
+        (activity) => ({
+          ...activityDummyData,
+          ...activity,
+          date: parseDate(activity.date),
+          feeInAssetProfileCurrency: activity.fee,
+          feeInBaseCurrency: activity.fee,
+          SymbolProfile: {
+            ...symbolProfileDummyData,
+            currency: activity.currency,
+            dataSource: activity.dataSource,
+            name: 'NVIDIA Corporation',
+            symbol: activity.symbol
+          },
+          unitPriceInAssetProfileCurrency: activity.unitPrice
+        })
+      );
+
+      // Mirrors the production flow in
+      // ActivitiesService.getActivitiesForPortfolioCalculator
+      const adjustedActivities = applySplitAdjustments({
+        activities,
+        splits: [
+          {
+            dataSource: 'YAHOO',
+            date: parseDate('2024-06-10'),
+            factor: 10,
+            symbol: 'NVDA'
+          }
+        ]
+      });
+
+      const portfolioCalculator = portfolioCalculatorFactory.createCalculator({
+        activities: adjustedActivities,
+        calculationType: PerformanceCalculationType.ROAI,
+        currency: exportResponse.user.settings.currency,
+        userId: userDummyData.id
+      });
+
+      const portfolioSnapshot = await portfolioCalculator.computeSnapshot();
+
+      const investments = portfolioCalculator.getInvestments();
+
+      expect(portfolioSnapshot).toMatchObject({
+        currentValueInBaseCurrency: new Big('0'),
+        errors: [],
+        hasErrors: false,
+        positions: [
+          {
+            activitiesCount: 2,
+            averagePrice: new Big('0'),
+            currency: 'USD',
+            dataSource: 'YAHOO',
+            dateOfFirstActivity: '2024-06-03',
+            dividend: new Big('0'),
+            dividendInBaseCurrency: new Big('0'),
+            fee: new Big('0'),
+            feeInBaseCurrency: new Big('0'),
+            grossPerformance: new Big('50'), // 10 × (125 - 120) = 50
+            grossPerformanceWithCurrencyEffect: new Big('50'),
+            investment: new Big('0'),
+            investmentWithCurrencyEffect: new Big('0'),
+            netPerformance: new Big('50'),
+            netPerformanceWithCurrencyEffectMap: {
+              max: new Big('50')
+            },
+            marketPrice: 125,
+            marketPriceInBaseCurrency: 125,
+            quantity: new Big('0'),
+            symbol: 'NVDA',
+            tags: [],
+            timeWeightedInvestment: new Big('1200'), // 10 × 120 = 1200
+            timeWeightedInvestmentWithCurrencyEffect: new Big('1200'),
+            valueInBaseCurrency: new Big('0')
+          }
+        ],
+        totalFeesWithCurrencyEffect: new Big('0'),
+        totalInterestWithCurrencyEffect: new Big('0'),
+        totalInvestment: new Big('0'),
+        totalInvestmentWithCurrencyEffect: new Big('0'),
+        totalLiabilitiesWithCurrencyEffect: new Big('0')
+      });
+
+      expect(investments).toEqual([
+        { date: '2024-06-03', investment: new Big('1200') },
+        { date: '2024-06-14', investment: new Big('0') }
+      ]);
+    });
+  });
+});
diff --git a/apps/api/src/app/portfolio/current-rate.service.mock.ts b/apps/api/src/app/portfolio/current-rate.service.mock.ts
index 8e027f971..2e634c26c 100644
--- a/apps/api/src/app/portfolio/current-rate.service.mock.ts
+++ b/apps/api/src/app/portfolio/current-rate.service.mock.ts
@@ -95,6 +95,16 @@ function mockGetValue(symbol: string, date: Date) {
 
       return { marketPrice: 0 };
 
+    case 'NVDA':
+      // Split-adjusted market prices (10:1 split on 2024-06-10)
+      if (isSameDay(parseDate('2024-06-03'), date)) {
+        return { marketPrice: 120 };
+      } else if (isSameDay(parseDate('2024-06-14'), date)) {
+        return { marketPrice: 125 };
+      }
+
+      return { marketPrice: 0 };
+
     default:
       return { marketPrice: 0 };
   }
diff --git a/apps/api/src/app/portfolio/portfolio.service.spec.ts b/apps/api/src/app/portfolio/portfolio.service.spec.ts
index 04142c92b..133587c3b 100644
--- a/apps/api/src/app/portfolio/portfolio.service.spec.ts
+++ b/apps/api/src/app/portfolio/portfolio.service.spec.ts
@@ -4,6 +4,7 @@ import { ActivitiesService } from '@ghostfolio/api/app/activities/activities.ser
 import { userDummyData } from '@ghostfolio/api/app/portfolio/calculator/portfolio-calculator-test-utils';
 import { PortfolioCalculatorFactory } from '@ghostfolio/api/app/portfolio/calculator/portfolio-calculator.factory';
 import { UserService } from '@ghostfolio/api/app/user/user.service';
+import { AssetProfileSplitService } from '@ghostfolio/api/services/asset-profile-split/asset-profile-split.service';
 import { ConfigurationService } from '@ghostfolio/api/services/configuration/configuration.service';
 import { DataProviderService } from '@ghostfolio/api/services/data-provider/data-provider.service';
 import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service';
@@ -60,6 +61,7 @@ describe('PortfolioService', () => {
     activitiesService = new ActivitiesService(
       null,
       accountService,
+      new AssetProfileSplitService(null),
       null,
       null,
       dataProviderService,
diff --git a/apps/api/src/helper/portfolio.helper.spec.ts b/apps/api/src/helper/portfolio.helper.spec.ts
new file mode 100644
index 000000000..32f2f176a
--- /dev/null
+++ b/apps/api/src/helper/portfolio.helper.spec.ts
@@ -0,0 +1,176 @@
+import { DataSource } from '@prisma/client';
+
+import { applySplitAdjustments } from './portfolio.helper';
+
+describe('applySplitAdjustments', () => {
+  const symbolProfile = {
+    dataSource: DataSource.YAHOO,
+    symbol: 'NVDA'
+  };
+
+  const otherSymbolProfile = {
+    dataSource: DataSource.YAHOO,
+    symbol: 'AAPL'
+  };
+
+  const createActivity = ({
+    date,
+    fee = 1,
+    quantity,
+    SymbolProfile = symbolProfile,
+    unitPrice
+  }: {
+    date: Date;
+    fee?: number;
+    quantity: number;
+    SymbolProfile?: typeof symbolProfile;
+    unitPrice: number;
+  }) => {
+    return {
+      date,
+      fee,
+      quantity,
+      SymbolProfile,
+      unitPrice,
+      unitPriceInAssetProfileCurrency: unitPrice
+    };
+  };
+
+  it('should return activities unchanged if there are no splits', () => {
+    const activities = [
+      createActivity({
+        date: new Date('2024-01-15'),
+        quantity: 10,
+        unitPrice: 400
+      })
+    ];
+
+    expect(applySplitAdjustments({ activities, splits: [] })).toStrictEqual(
+      activities
+    );
+  });
+
+  it('should adjust an activity before a split', () => {
+    const activities = [
+      createActivity({
+        date: new Date('2024-01-15'),
+        quantity: 10,
+        unitPrice: 400
+      })
+    ];
+
+    const [activity] = applySplitAdjustments({
+      activities,
+      splits: [{ ...symbolProfile, date: new Date('2024-06-10'), factor: 4 }]
+    });
+
+    expect(activity.quantity).toBe(40);
+    expect(activity.unitPrice).toBe(100);
+    expect(activity.unitPriceInAssetProfileCurrency).toBe(100);
+  });
+
+  it('should keep the value and the fee unchanged', () => {
+    const activities = [
+      createActivity({
+        date: new Date('2024-01-15'),
+        fee: 7,
+        quantity: 3,
+        unitPrice: 700
+      })
+    ];
+
+    const [activity] = applySplitAdjustments({
+      activities,
+      splits: [{ ...symbolProfile, date: new Date('2024-06-10'), factor: 4 }]
+    });
+
+    expect(activity.quantity * activity.unitPrice).toBe(3 * 700);
+    expect(activity.fee).toBe(7);
+  });
+
+  it('should not adjust an activity on or after the split date', () => {
+    const activities = [
+      createActivity({
+        date: new Date('2024-06-10'),
+        quantity: 10,
+        unitPrice: 100
+      }),
+      createActivity({
+        date: new Date('2024-07-01'),
+        quantity: 20,
+        unitPrice: 110
+      })
+    ];
+
+    const adjustedActivities = applySplitAdjustments({
+      activities,
+      splits: [{ ...symbolProfile, date: new Date('2024-06-10'), factor: 4 }]
+    });
+
+    expect(adjustedActivities).toStrictEqual(activities);
+  });
+
+  it('should adjust for a reverse split', () => {
+    const activities = [
+      createActivity({
+        date: new Date('2024-01-15'),
+        quantity: 100,
+        unitPrice: 2
+      })
+    ];
+
+    const [activity] = applySplitAdjustments({
+      activities,
+      splits: [{ ...symbolProfile, date: new Date('2024-06-10'), factor: 0.1 }]
+    });
+
+    expect(activity.quantity).toBe(10);
+    expect(activity.unitPrice).toBe(20);
+  });
+
+  it('should compound multiple splits', () => {
+    const activities = [
+      createActivity({
+        date: new Date('2023-01-15'),
+        quantity: 10,
+        unitPrice: 600
+      }),
+      createActivity({
+        date: new Date('2024-01-15'),
+        quantity: 10,
+        unitPrice: 300
+      })
+    ];
+
+    const adjustedActivities = applySplitAdjustments({
+      activities,
+      splits: [
+        { ...symbolProfile, date: new Date('2023-06-10'), factor: 2 },
+        { ...symbolProfile, date: new Date('2024-06-10'), factor: 3 }
+      ]
+    });
+
+    expect(adjustedActivities[0].quantity).toBe(60);
+    expect(adjustedActivities[0].unitPrice).toBe(100);
+    expect(adjustedActivities[1].quantity).toBe(30);
+    expect(adjustedActivities[1].unitPrice).toBe(100);
+  });
+
+  it('should not adjust activities of other symbols', () => {
+    const activities = [
+      createActivity({
+        date: new Date('2024-01-15'),
+        quantity: 10,
+        SymbolProfile: otherSymbolProfile,
+        unitPrice: 190
+      })
+    ];
+
+    const adjustedActivities = applySplitAdjustments({
+      activities,
+      splits: [{ ...symbolProfile, date: new Date('2024-06-10'), factor: 4 }]
+    });
+
+    expect(adjustedActivities).toStrictEqual(activities);
+  });
+});
diff --git a/apps/api/src/helper/portfolio.helper.ts b/apps/api/src/helper/portfolio.helper.ts
index 6ebe48d3c..86b8dc2fa 100644
--- a/apps/api/src/helper/portfolio.helper.ts
+++ b/apps/api/src/helper/portfolio.helper.ts
@@ -1,4 +1,9 @@
+import { getAssetProfileIdentifier } from '@ghostfolio/common/helper';
+import { AssetProfileIdentifier } from '@ghostfolio/common/interfaces';
+
 import { Type as ActivityType } from '@prisma/client';
+import { Big } from 'big.js';
+import { isBefore } from 'date-fns';
 
 export function getFactor(activityType: ActivityType) {
   let factor: number;
@@ -17,3 +22,88 @@ export function getFactor(activityType: ActivityType) {
 
   return factor;
 }
+
+/**
+ * Adjusts activities for splits so that their quantity and unit price are in
+ * the same share basis as the (split-adjusted) market data of the data
+ * providers.
+ *
+ * Activities dated strictly before a split are considered to be in pre-split
+ * terms: their quantity is multiplied and their unit price is divided by the
+ * split factor (shares after per 1 share before). Activities dated on or
+ * after the split date are already in post-split terms. The value
+ * (quantity × unit price) and the fee remain unchanged.
+ */
+export function applySplitAdjustments<
+  T extends {
+    date: Date;
+    quantity: number;
+    SymbolProfile: AssetProfileIdentifier;
+    unitPrice: number;
+    unitPriceInAssetProfileCurrency?: number;
+  }
+>({
+  activities,
+  splits
+}: {
+  activities: T[];
+  splits: (AssetProfileIdentifier & { date: Date; factor: number })[];
+}): T[] {
+  if (splits.length === 0) {
+    return activities;
+  }
+
+  const splitsByAssetProfile = new Map<
+    string,
+    { date: Date; factor: number }[]
+  >();
+
+  for (const split of splits) {
+    const key = getAssetProfileIdentifier(split);
+
+    if (!splitsByAssetProfile.has(key)) {
+      splitsByAssetProfile.set(key, []);
+    }
+
+    splitsByAssetProfile.get(key).push(split);
+  }
+
+  return activities.map((activity) => {
+    const splitsOfAssetProfile = activity.SymbolProfile
+      ? splitsByAssetProfile.get(
+          getAssetProfileIdentifier(activity.SymbolProfile)
+        )
+      : undefined;
+
+    if (!splitsOfAssetProfile) {
+      return activity;
+    }
+
+    let factor = new Big(1);
+
+    for (const split of splitsOfAssetProfile) {
+      if (isBefore(activity.date, split.date)) {
+        factor = factor.mul(split.factor);
+      }
+    }
+
+    if (factor.eq(1)) {
+      return activity;
+    }
+
+    return {
+      ...activity,
+      quantity: factor.mul(activity.quantity).toNumber(),
+      unitPrice: new Big(activity.unitPrice).div(factor).toNumber(),
+      ...(activity.unitPriceInAssetProfileCurrency === undefined
+        ? {}
+        : {
+            unitPriceInAssetProfileCurrency: new Big(
+              activity.unitPriceInAssetProfileCurrency
+            )
+              .div(factor)
+              .toNumber()
+          })
+    };
+  });
+}
diff --git a/apps/api/src/services/asset-profile-split/asset-profile-split.module.ts b/apps/api/src/services/asset-profile-split/asset-profile-split.module.ts
new file mode 100644
index 000000000..1219a2f98
--- /dev/null
+++ b/apps/api/src/services/asset-profile-split/asset-profile-split.module.ts
@@ -0,0 +1,12 @@
+import { PrismaModule } from '@ghostfolio/api/services/prisma/prisma.module';
+
+import { Module } from '@nestjs/common';
+
+import { AssetProfileSplitService } from './asset-profile-split.service';
+
+@Module({
+  exports: [AssetProfileSplitService],
+  imports: [PrismaModule],
+  providers: [AssetProfileSplitService]
+})
+export class AssetProfileSplitModule {}
diff --git a/apps/api/src/services/asset-profile-split/asset-profile-split.service.ts b/apps/api/src/services/asset-profile-split/asset-profile-split.service.ts
new file mode 100644
index 000000000..0823c6fff
--- /dev/null
+++ b/apps/api/src/services/asset-profile-split/asset-profile-split.service.ts
@@ -0,0 +1,104 @@
+import { PrismaService } from '@ghostfolio/api/services/prisma/prisma.service';
+import { AssetProfileIdentifier } from '@ghostfolio/common/interfaces';
+
+import { Injectable } from '@nestjs/common';
+import { AssetProfileSplit } from '@prisma/client';
+
+@Injectable()
+export class AssetProfileSplitService {
+  public constructor(private readonly prismaService: PrismaService) {}
+
+  public async deleteById({
+    dataSource,
+    id,
+    symbol
+  }: AssetProfileIdentifier & { id: string }) {
+    return this.prismaService.assetProfileSplit.deleteMany({
+      where: {
+        dataSource,
+        id,
+        symbol
+      }
+    });
+  }
+
+  public async deleteMany({ dataSource, symbol }: AssetProfileIdentifier) {
+    return this.prismaService.assetProfileSplit.deleteMany({
+      where: {
+        dataSource,
+        symbol
+      }
+    });
+  }
+
+  public async getSplits({
+    assetProfileIdentifiers
+  }: {
+    assetProfileIdentifiers: AssetProfileIdentifier[];
+  }): Promise<AssetProfileSplit[]> {
+    if (assetProfileIdentifiers.length === 0) {
+      return [];
+    }
+
+    return this.prismaService.assetProfileSplit.findMany({
+      orderBy: [
+        {
+          date: 'asc'
+        }
+      ],
+      where: {
+        OR: assetProfileIdentifiers.map(({ dataSource, symbol }) => {
+          return {
+            dataSource,
+            symbol
+          };
+        })
+      }
+    });
+  }
+
+  public async upsert({
+    dataSource,
+    date,
+    factor,
+    symbol
+  }: AssetProfileIdentifier & {
+    date: Date;
+    factor: number;
+  }): Promise<AssetProfileSplit> {
+    return this.prismaService.assetProfileSplit.upsert({
+      create: {
+        dataSource,
+        date,
+        factor,
+        symbol
+      },
+      update: {
+        factor
+      },
+      where: {
+        dataSource_date_symbol: {
+          dataSource,
+          date,
+          symbol
+        }
+      }
+    });
+  }
+
+  public async updateAssetProfileIdentifier(
+    oldAssetProfileIdentifier: AssetProfileIdentifier,
+    newAssetProfileIdentifier: AssetProfileIdentifier
+  ) {
+    return this.prismaService.assetProfileSplit.updateMany({
+      data: {
+        dataSource: newAssetProfileIdentifier.dataSource,
+        symbol: newAssetProfileIdentifier.symbol
+      },
+      where: {
+        dataSource: oldAssetProfileIdentifier.dataSource,
+        symbol: oldAssetProfileIdentifier.symbol
+      }
+    });
+  }
+}
diff --git a/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts b/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts
index 967a289ef..74a2bf791 100644
--- a/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts
+++ b/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts
@@ -10,6 +10,7 @@ import {
   DATE_FORMAT,
   getCountryName,
   getCurrencyFromSymbol,
+  getDateFormatString,
   isCurrency
 } from '@ghostfolio/common/helper';
 import {
@@ -60,6 +61,7 @@ import {
   MatCheckboxChange,
   MatCheckboxModule
 } from '@angular/material/checkbox';
+import { MatDatepickerModule } from '@angular/material/datepicker';
 import {
   MAT_DIALOG_DATA,
   MatDialogModule,
@@ -73,6 +75,7 @@ import { MatTabsModule } from '@angular/material/tabs';
 import { IonIcon } from '@ionic/angular/standalone';
 import {
   AssetClass,
+  AssetProfileSplit,
   AssetSubClass,
   DataGatheringFrequency,
   MarketData,
@@ -84,11 +87,14 @@ import { format } from 'date-fns';
 import { StatusCodes } from 'http-status-codes';
 import { addIcons } from 'ionicons';
 import {
+  calendarClearOutline,
   codeSlashOutline,
   createOutline,
   ellipsisVertical,
+  gitCompareOutline,
   readerOutline,
-  serverOutline
+  serverOutline,
+  trashOutline
 } from 'ionicons/icons';
 import { isBoolean } from 'lodash';
 import ms from 'ms';
@@ -112,6 +118,7 @@ import { AssetProfileDialogParams } from './interfaces/interfaces';
     IonIcon,
     MatButtonModule,
     MatCheckboxModule,
+    MatDatepickerModule,
     MatDialogModule,
     MatInputModule,
     MatMenuModule,
@@ -192,6 +199,18 @@ export class GfAssetProfileDialogComponent implements OnInit {
     }
   );
 
+  protected readonly assetProfileSplitForm = this.formBuilder.group({
+    date: new FormControl<Date | null>(null, Validators.required),
+    factor: new FormControl<number | null>(null, [
+      Validators.required,
+      (control: AbstractControl): ValidationErrors | null => {
+        return control.value > 0 && control.value !== 1
+          ? null
+          : { invalidSplitFactor: true };
+      }
+    ])
+  });
+
   protected readonly canDeleteAssetProfile = canDeleteAssetProfile;
   protected canEditAssetProfile = true;
 
@@ -241,6 +260,7 @@ export class GfAssetProfileDialogComponent implements OnInit {
       value: 'max'
     }
   ];
+  protected defaultDateFormat: string;
   protected readonly getCountryName = getCountryName;
   protected historicalDataItems: LineChartItem[];
   protected isBenchmark = false;
@@ -264,6 +284,8 @@ export class GfAssetProfileDialogComponent implements OnInit {
     [name: string]: { name: string; value: number };
   };
 
+  protected splits: AssetProfileSplit[] = [];
+
   protected readonly translate = translate;
 
   protected user: User;
@@ -284,11 +306,14 @@ export class GfAssetProfileDialogComponent implements OnInit {
     private userService: UserService
   ) {
     addIcons({
+      calendarClearOutline,
       codeSlashOutline,
       createOutline,
       ellipsisVertical,
+      gitCompareOutline,
       readerOutline,
-      serverOutline
+      serverOutline,
+      trashOutline
     });
   }
 
@@ -301,6 +326,7 @@ export class GfAssetProfileDialogComponent implements OnInit {
 
     this.benchmarks = benchmarks;
     this.currencies = currencies;
+    this.defaultDateFormat = getDateFormatString(this.data.locale);
 
     this.initialize();
   }
@@ -355,8 +381,9 @@ export class GfAssetProfileDialogComponent implements OnInit {
         symbol: this.data.symbol
       })
       .pipe(takeUntilDestroyed(this.destroyRef))
-      .subscribe(({ assetProfile, marketData }) => {
+      .subscribe(({ assetProfile, marketData, splits }) => {
         this.assetProfile = assetProfile;
+        this.splits = splits ?? [];
 
         this.assetClassLabel = translate(this.assetProfile?.assetClass ?? '');
         this.assetSubClassLabel = translate(
@@ -499,6 +526,39 @@ export class GfAssetProfileDialogComponent implements OnInit {
       .subscribe();
   }
 
+  protected onAddSplit() {
+    const { date, factor } = this.assetProfileSplitForm.getRawValue();
+
+    this.adminService
+      .postAssetProfileSplit({
+        dataSource: this.data.dataSource,
+        split: {
+          factor,
+          date: format(date, DATE_FORMAT)
+        },
+        symbol: this.data.symbol
+      })
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe(() => {
+        this.assetProfileSplitForm.reset();
+
+        this.initialize();
+      });
+  }
+
+  protected onDeleteSplit(aId: string) {
+    this.adminService
+      .deleteAssetProfileSplit({
+        id: aId,
+        dataSource: this.data.dataSource,
+        symbol: this.data.symbol
+      })
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe(() => {
+        this.initialize();
+      });
+  }
+
   protected onMarketDataChanged(withRefresh: boolean = false) {
     if (withRefresh) {
       this.initialize();
diff --git a/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.html b/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.html
index 9b69ef6fc..93fb24f03 100644
--- a/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.html
+++ b/apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.html
@@ -489,6 +489,107 @@
           </div>
         </div>
       </mat-tab>
+      <mat-tab>
+        <ng-template mat-tab-label>
+          <ion-icon name="git-compare-outline" />
+          <div class="d-none d-sm-block ml-2" i18n>Splits</div>
+        </ng-template>
+        <div class="container mt-3 p-0">
+          <div class="no-gutters row w-100">
+            <div class="col-12">
+              <p class="text-muted" i18n>
+                Activities dated before a split are adjusted at calculation
+                time. After adding a split, gather the historical market data of
+                this asset profile again.
+              </p>
+              @if (splits.length > 0) {
+                <table class="gf-table mb-3 w-100">
+                  <thead>
+                    <tr class="mat-mdc-header-row">
+                      <th class="mat-mdc-header-cell px-1 py-2" i18n>Date</th>
+                      <th class="mat-mdc-header-cell px-1 py-2 text-right" i18n>
+                        Split Factor
+                      </th>
+                      <th class="mat-mdc-header-cell px-1 py-2"></th>
+                    </tr>
+                  </thead>
+                  <tbody>
+                    @for (split of splits; track split.id) {
+                      <tr class="mat-mdc-row">
+                        <td class="mat-mdc-cell px-1 py-2">
+                          {{ split.date | date: defaultDateFormat }}
+                        </td>
+                        <td class="mat-mdc-cell px-1 py-2 text-right">
+                          {{ split.factor }}
+                        </td>
+                        <td class="mat-mdc-cell px-1 py-2 text-right">
+                          <button
+                            mat-icon-button
+                            type="button"
+                            [disabled]="!canEditAssetProfile"
+                            (click)="onDeleteSplit(split.id)"
+                          >
+                            <ion-icon name="trash-outline" />
+                          </button>
+                        </td>
+                      </tr>
+                    }
+                  </tbody>
+                </table>
+              }
+              <form
+                class="align-items-center d-flex"
+                [formGroup]="assetProfileSplitForm"
+                (ngSubmit)="onAddSplit()"
+              >
+                <mat-form-field appearance="outline" class="mr-3 without-hint">
+                  <mat-label i18n>Date</mat-label>
+                  <input
+                    formControlName="date"
+                    matInput
+                    [matDatepicker]="dateOfSplit"
+                  />
+                  <mat-datepicker-toggle
+                    class="mr-2"
+                    matSuffix
+                    [for]="dateOfSplit"
+                  >
+                    <ion-icon
+                      class="text-muted"
+                      matDatepickerToggleIcon
+                      name="calendar-clear-outline"
+                    />
+                  </mat-datepicker-toggle>
+                  <mat-datepicker #dateOfSplit />
+                </mat-form-field>
+                <mat-form-field appearance="outline" class="mr-3">
+                  <mat-label i18n>Split Factor</mat-label>
+                  <input
+                    formControlName="factor"
+                    matInput
+                    step="any"
+                    type="number"
+                  />
+                  <mat-hint i18n
+                    >Shares after per 1 share before, e.g. 4 for a 4:1 split or
+                    0.1 for a 1:10 reverse split</mat-hint
+                  >
+                </mat-form-field>
+                <button
+                  color="primary"
+                  mat-flat-button
+                  type="submit"
+                  [disabled]="
+                    !assetProfileSplitForm.valid || !canEditAssetProfile
+                  "
+                >
+                  <ng-container i18n>Add</ng-container>
+                </button>
+              </form>
+            </div>
+          </div>
+        </div>
+      </mat-tab>
       @if (assetProfile?.dataSource === 'MANUAL') {
         <mat-tab>
           <ng-template mat-tab-label>
diff --git a/libs/common/src/lib/dtos/create-asset-profile-split.dto.ts b/libs/common/src/lib/dtos/create-asset-profile-split.dto.ts
new file mode 100644
index 000000000..0f4f1367b
--- /dev/null
+++ b/libs/common/src/lib/dtos/create-asset-profile-split.dto.ts
@@ -0,0 +1,12 @@
+import { IsISO8601, IsNumber, Validate } from 'class-validator';
+
+import { IsSplitFactorConstraint } from '../validator-constraints/is-split-factor';
+
+export class CreateAssetProfileSplitDto {
+  @IsISO8601()
+  date: string;
+
+  @IsNumber()
+  @Validate(IsSplitFactorConstraint)
+  factor: number;
+}
diff --git a/libs/common/src/lib/dtos/index.ts b/libs/common/src/lib/dtos/index.ts
index cf0ce6f57..7a67c387c 100644
--- a/libs/common/src/lib/dtos/index.ts
+++ b/libs/common/src/lib/dtos/index.ts
@@ -3,6 +3,7 @@ import { CreateAccessDto } from './create-access.dto';
 import { CreateAccountBalanceDto } from './create-account-balance.dto';
 import { CreateAccountWithBalancesDto } from './create-account-with-balances.dto';
 import { CreateAccountDto } from './create-account.dto';
+import { CreateAssetProfileSplitDto } from './create-asset-profile-split.dto';
 import { CreateAssetProfileWithMarketDataDto } from './create-asset-profile-with-market-data.dto';
 import { CreateAssetProfileDto } from './create-asset-profile.dto';
 import { CreateOrderDto } from './create-order.dto';
@@ -31,6 +32,7 @@ export {
   CreateAccountDto,
   CreateAccountWithBalancesDto,
   CreateAssetProfileDto,
+  CreateAssetProfileSplitDto,
   CreateAssetProfileWithMarketDataDto,
   CreateOrderDto,
   CreatePlatformDto,
diff --git a/libs/common/src/lib/interfaces/admin-market-data-details.interface.ts b/libs/common/src/lib/interfaces/admin-market-data-details.interface.ts
index 441643f81..fc0aec007 100644
--- a/libs/common/src/lib/interfaces/admin-market-data-details.interface.ts
+++ b/libs/common/src/lib/interfaces/admin-market-data-details.interface.ts
@@ -1,8 +1,9 @@
-import { MarketData } from '@prisma/client';
+import { AssetProfileSplit, MarketData } from '@prisma/client';
 
 import { EnhancedSymbolProfile } from './enhanced-symbol-profile.interface';
 
 export interface AdminMarketDataDetails {
   assetProfile: Partial<EnhancedSymbolProfile>;
   marketData: MarketData[];
+  splits: AssetProfileSplit[];
 }
diff --git a/libs/common/src/lib/interfaces/responses/asset-profile-response.interface.ts b/libs/common/src/lib/interfaces/responses/asset-profile-response.interface.ts
index 884b0d411..8cb241cb8 100644
--- a/libs/common/src/lib/interfaces/responses/asset-profile-response.interface.ts
+++ b/libs/common/src/lib/interfaces/responses/asset-profile-response.interface.ts
@@ -1,8 +1,9 @@
-import { MarketData } from '@prisma/client';
+import { AssetProfileSplit, MarketData } from '@prisma/client';
 
 import { EnhancedSymbolProfile } from '../enhanced-symbol-profile.interface';
 
 export interface AssetProfileResponse {
   assetProfile: Partial<EnhancedSymbolProfile>;
   marketData: MarketData[];
+  splits: AssetProfileSplit[];
 }
diff --git a/libs/common/src/lib/validator-constraints/is-split-factor.ts b/libs/common/src/lib/validator-constraints/is-split-factor.ts
new file mode 100644
index 000000000..40e13eb55
--- /dev/null
+++ b/libs/common/src/lib/validator-constraints/is-split-factor.ts
@@ -0,0 +1,15 @@
+import {
+  ValidatorConstraint,
+  ValidatorConstraintInterface
+} from 'class-validator';
+
+@ValidatorConstraint({ name: 'isSplitFactor' })
+export class IsSplitFactorConstraint implements ValidatorConstraintInterface {
+  public defaultMessage() {
+    return 'factor must be a positive number other than 1';
+  }
+
+  public validate(aFactor: number) {
+    return typeof aFactor === 'number' && aFactor > 0 && aFactor !== 1;
+  }
+}
diff --git a/libs/ui/src/lib/services/admin.service.ts b/libs/ui/src/lib/services/admin.service.ts
index 4d2f6e48f..075397308 100644
--- a/libs/ui/src/lib/services/admin.service.ts
+++ b/libs/ui/src/lib/services/admin.service.ts
@@ -4,6 +4,7 @@ import {
   HEADER_KEY_TOKEN
 } from '@ghostfolio/common/config';
 import {
+  CreateAssetProfileSplitDto,
   CreatePlatformDto,
   UpdateAssetProfileDto,
   UpdatePlatformDto
@@ -23,7 +24,7 @@ import { GF_ENVIRONMENT } from '@ghostfolio/ui/environment';
 
 import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
 import { Injectable, inject } from '@angular/core';
-import { MarketData, Platform } from '@prisma/client';
+import { AssetProfileSplit, MarketData, Platform } from '@prisma/client';
 import { JobStatus } from 'bull';
 import { isNumber } from 'lodash';
 
@@ -61,6 +62,16 @@ export class AdminService {
     return this.http.delete<void>(`/api/v1/platform/${aId}`);
   }
 
+  public deleteAssetProfileSplit({
+    dataSource,
+    id,
+    symbol
+  }: AssetProfileIdentifier & { id: string }) {
+    return this.http.delete<void>(
+      `/api/v1/asset-profiles/${dataSource}/${encodeURIComponent(symbol)}/splits/${id}`
+    );
+  }
+
   public deleteProfileData({ dataSource, symbol }: AssetProfileIdentifier) {
     return this.http.delete<void>(
       `/api/v1/admin/profile-data/${dataSource}/${encodeURIComponent(symbol)}`
@@ -217,6 +228,17 @@ export class AdminService {
     );
   }
 
+  public postAssetProfileSplit({
+    dataSource,
+    split,
+    symbol
+  }: AssetProfileIdentifier & { split: CreateAssetProfileSplitDto }) {
+    return this.http.post<AssetProfileSplit>(
+      `/api/v1/asset-profiles/${dataSource}/${encodeURIComponent(symbol)}/splits`,
+      split
+    );
+  }
+
   public postPlatform(aPlatform: CreatePlatformDto) {
     return this.http.post<Platform>(`/api/v1/platform`, aPlatform);
   }
diff --git a/libs/ui/src/lib/services/data.service.ts b/libs/ui/src/lib/services/data.service.ts
index 5492794d7..81a8fa729 100644
--- a/libs/ui/src/lib/services/data.service.ts
+++ b/libs/ui/src/lib/services/data.service.ts
@@ -553,6 +553,10 @@ export class DataService {
             item.date = parseISO(item.date);
           }
 
+          for (const item of data.splits ?? []) {
+            item.date = parseISO(item.date);
+          }
+
           return data;
         })
       );
diff --git a/prisma/migrations/20260705000000_added_asset_profile_split/migration.sql b/prisma/migrations/20260705000000_added_asset_profile_split/migration.sql
new file mode 100644
index 000000000..93f889e15
--- /dev/null
+++ b/prisma/migrations/20260705000000_added_asset_profile_split/migration.sql
@@ -0,0 +1,21 @@
+-- CreateTable
+CREATE TABLE "public"."AssetProfileSplit" (
+  "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  "dataSource" "public"."DataSource" NOT NULL,
+  "date" TIMESTAMP(3) NOT NULL,
+  "factor" DOUBLE PRECISION NOT NULL,
+  "id" TEXT NOT NULL,
+  "symbol" TEXT NOT NULL,
+  "updatedAt" TIMESTAMP(3) NOT NULL,
+
+  CONSTRAINT "AssetProfileSplit_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "AssetProfileSplit_dataSource_date_symbol_key" ON "public"."AssetProfileSplit"("dataSource", "date", "symbol");
+
+-- CreateIndex
+CREATE INDEX "AssetProfileSplit_dataSource_symbol_idx" ON "public"."AssetProfileSplit"("dataSource", "symbol");
+
+-- CreateIndex
+CREATE INDEX "AssetProfileSplit_date_idx" ON "public"."AssetProfileSplit"("date");
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 233a63688..2525c3668 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -104,6 +104,20 @@ model AssetProfileResolution {
   @@unique([dataSourceOrigin, symbolOrigin])
 }
 
+model AssetProfileSplit {
+  createdAt  DateTime   @default(now())
+  dataSource DataSource
+  date       DateTime
+  factor     Float
+  id         String     @id @default(uuid())
+  symbol     String
+  updatedAt  DateTime   @updatedAt
+
+  @@unique([dataSource, date, symbol])
+  @@index([dataSource, symbol])
+  @@index([date])
+}
+
 model AuthDevice {
   createdAt           DateTime @default(now())
   credentialId        Bytes
diff --git a/test/import/ok/nvda-buy-with-split-and-sell.json b/test/import/ok/nvda-buy-with-split-and-sell.json
new file mode 100644
index 000000000..550c63da6
--- /dev/null
+++ b/test/import/ok/nvda-buy-with-split-and-sell.json
@@ -0,0 +1,34 @@
+{
+  "meta": {
+    "date": "2024-06-14T21:28:05.857Z",
+    "version": "dev"
+  },
+  "activities": [
+    {
+      "fee": 0,
+      "quantity": 10,
+      "type": "SELL",
+      "unitPrice": 125,
+      "currency": "USD",
+      "dataSource": "YAHOO",
+      "date": "2024-06-14T00:00:00.000Z",
+      "symbol": "NVDA"
+    },
+    {
+      "fee": 0,
+      "quantity": 1,
+      "type": "BUY",
+      "unitPrice": 1200,
+      "currency": "USD",
+      "dataSource": "YAHOO",
+      "date": "2024-06-03T00:00:00.000Z",
+      "symbol": "NVDA"
+    }
+  ],
+  "user": {
+    "settings": {
+      "currency": "USD",
+      "performanceCalculationType": "ROAI"
+    }
+  }
+}