diff --git a/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-baln-buy-and-buy.spec.ts b/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-baln-buy-and-buy.spec.ts
new file mode 100644
index 000000000..9ffa1b409
--- /dev/null
+++ b/apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-baln-buy-and-buy.spec.ts
@@ -0,0 +1,208 @@
+import { Activity } from '@ghostfolio/api/app/order/interfaces/activities.interface';
+import {
+  activityDummyData,
+  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 { 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 { PerformanceCalculationType } from '@ghostfolio/common/types/performance-calculation-type.type';
+
+import { Big } from 'big.js';
+
+jest.mock('@ghostfolio/api/app/portfolio/current-rate.service', () => {
+  return {
+    // eslint-disable-next-line @typescript-eslint/naming-convention
+    CurrentRateService: jest.fn().mockImplementation(() => {
+      return CurrentRateServiceMock;
+    })
+  };
+});
+
+jest.mock(
+  '@ghostfolio/api/services/queues/portfolio-snapshot/portfolio-snapshot.service',
+  () => {
+    return {
+      // eslint-disable-next-line @typescript-eslint/naming-convention
+      PortfolioSnapshotService: jest.fn().mockImplementation(() => {
+        return PortfolioSnapshotServiceMock;
+      })
+    };
+  }
+);
+
+jest.mock('@ghostfolio/api/app/redis-cache/redis-cache.service', () => {
+  return {
+    // eslint-disable-next-line @typescript-eslint/naming-convention
+    RedisCacheService: jest.fn().mockImplementation(() => {
+      return RedisCacheServiceMock;
+    })
+  };
+});
+
+describe('PortfolioCalculator', () => {
+  let configurationService: ConfigurationService;
+  let currentRateService: CurrentRateService;
+  let exchangeRateDataService: ExchangeRateDataService;
+  let portfolioCalculatorFactory: PortfolioCalculatorFactory;
+  let portfolioSnapshotService: PortfolioSnapshotService;
+  let redisCacheService: RedisCacheService;
+
+  beforeEach(() => {
+    configurationService = new ConfigurationService();
+
+    currentRateService = new CurrentRateService(null, null, null, null);
+
+    exchangeRateDataService = new ExchangeRateDataService(
+      null,
+      null,
+      null,
+      null
+    );
+
+    portfolioSnapshotService = new PortfolioSnapshotService(null);
+
+    redisCacheService = new RedisCacheService(null, null);
+
+    portfolioCalculatorFactory = new PortfolioCalculatorFactory(
+      configurationService,
+      currentRateService,
+      exchangeRateDataService,
+      portfolioSnapshotService,
+      redisCacheService
+    );
+  });
+
+  describe('get current positions', () => {
+    it.only('with BALN.SW buy and buy', async () => {
+      jest.useFakeTimers().setSystemTime(parseDate('2021-12-18').getTime());
+
+      const activities: Activity[] = [
+        {
+          ...activityDummyData,
+          date: new Date('2021-11-22'),
+          feeInAssetProfileCurrency: 1.55,
+          quantity: 2,
+          SymbolProfile: {
+            ...symbolProfileDummyData,
+            currency: 'CHF',
+            dataSource: 'YAHOO',
+            name: 'Bâloise Holding AG',
+            symbol: 'BALN.SW'
+          },
+          type: 'BUY',
+          unitPriceInAssetProfileCurrency: 142.9
+        },
+        {
+          ...activityDummyData,
+          date: new Date('2021-11-30'),
+          feeInAssetProfileCurrency: 1.65,
+          quantity: 2,
+          SymbolProfile: {
+            ...symbolProfileDummyData,
+            currency: 'CHF',
+            dataSource: 'YAHOO',
+            name: 'Bâloise Holding AG',
+            symbol: 'BALN.SW'
+          },
+          type: 'BUY',
+          unitPriceInAssetProfileCurrency: 136.6
+        }
+      ];
+
+      const portfolioCalculator = portfolioCalculatorFactory.createCalculator({
+        activities,
+        calculationType: PerformanceCalculationType.ROAI,
+        currency: 'CHF',
+        userId: userDummyData.id
+      });
+
+      const portfolioSnapshot = await portfolioCalculator.computeSnapshot();
+
+      const investments = portfolioCalculator.getInvestments();
+
+      const investmentsByMonth = portfolioCalculator.getInvestmentsByGroup({
+        data: portfolioSnapshot.historicalData,
+        groupBy: 'month'
+      });
+
+      expect(portfolioSnapshot).toMatchObject({
+        currentValueInBaseCurrency: new Big('595.6'),
+        errors: [],
+        hasErrors: false,
+        positions: [
+          {
+            averagePrice: new Big('139.75'),
+            currency: 'CHF',
+            dataSource: 'YAHOO',
+            dividend: new Big('0'),
+            dividendInBaseCurrency: new Big('0'),
+            fee: new Big('3.2'),
+            feeInBaseCurrency: new Big('3.2'),
+            firstBuyDate: '2021-11-22',
+            grossPerformance: new Big('36.6'),
+            grossPerformancePercentage: new Big('0.07706261539956593567'),
+            grossPerformancePercentageWithCurrencyEffect: new Big(
+              '0.07706261539956593567'
+            ),
+            grossPerformanceWithCurrencyEffect: new Big('36.6'),
+            investment: new Big('559'),
+            investmentWithCurrencyEffect: new Big('559'),
+            netPerformance: new Big('33.4'),
+            netPerformancePercentage: new Big('0.07032490039195361342'),
+            netPerformancePercentageWithCurrencyEffectMap: {
+              max: new Big('0.06986689805847808234')
+            },
+            netPerformanceWithCurrencyEffectMap: {
+              max: new Big('33.4')
+            },
+            marketPrice: 148.9,
+            marketPriceInBaseCurrency: 148.9,
+            quantity: new Big('4'),
+            symbol: 'BALN.SW',
+            tags: [],
+            timeWeightedInvestment: new Big('474.93846153846153846154'),
+            timeWeightedInvestmentWithCurrencyEffect: new Big(
+              '474.93846153846153846154'
+            ),
+            transactionCount: 2,
+            valueInBaseCurrency: new Big('595.6')
+          }
+        ],
+        totalFeesWithCurrencyEffect: new Big('3.2'),
+        totalInterestWithCurrencyEffect: new Big('0'),
+        totalInvestment: new Big('559'),
+        totalInvestmentWithCurrencyEffect: new Big('559'),
+        totalLiabilitiesWithCurrencyEffect: new Big('0')
+      });
+
+      expect(portfolioSnapshot.historicalData.at(-1)).toMatchObject(
+        expect.objectContaining({
+          netPerformance: 33.4,
+          netPerformanceInPercentage: 0.07032490039195362,
+          netPerformanceInPercentageWithCurrencyEffect: 0.07032490039195362,
+          netPerformanceWithCurrencyEffect: 33.4,
+          totalInvestmentValueWithCurrencyEffect: 559
+        })
+      );
+
+      expect(investments).toEqual([
+        { date: '2021-11-22', investment: new Big('285.8') },
+        { date: '2021-11-30', investment: new Big('559') }
+      ]);
+
+      expect(investmentsByMonth).toEqual([
+        { date: '2021-11-01', investment: 559 },
+        { date: '2021-12-01', investment: 0 }
+      ]);
+    });
+  });
+});