diff --git a/app/builders/v2/reports/timeseries/count_report_builder.rb b/app/builders/v2/reports/timeseries/count_report_builder.rb
index 46830f693..bb3b1250c 100644
--- a/app/builders/v2/reports/timeseries/count_report_builder.rb
+++ b/app/builders/v2/reports/timeseries/count_report_builder.rb
@@ -40,6 +40,7 @@ class V2::Reports::Timeseries::CountReportBuilder < V2::Reports::Timeseries::Bas
   def scope_for_resolutions_count
     scope.reporting_events.where(
       name: :conversation_resolved,
+      account_id: account.id,
       created_at: range
     )
   end
@@ -47,6 +48,7 @@ class V2::Reports::Timeseries::CountReportBuilder < V2::Reports::Timeseries::Bas
   def scope_for_bot_resolutions_count
     scope.reporting_events.where(
       name: :conversation_bot_resolved,
+      account_id: account.id,
       created_at: range
     )
   end
@@ -54,6 +56,7 @@ class V2::Reports::Timeseries::CountReportBuilder < V2::Reports::Timeseries::Bas
   def scope_for_bot_handoffs_count
     scope.reporting_events.joins(:conversation).select(:conversation_id).where(
       name: :conversation_bot_handoff,
+      account_id: account.id,
       created_at: range
     ).distinct
   end
diff --git a/spec/builders/v2/reports/timeseries/count_report_builder_spec.rb b/spec/builders/v2/reports/timeseries/count_report_builder_spec.rb
new file mode 100644
index 000000000..038bd61c2
--- /dev/null
+++ b/spec/builders/v2/reports/timeseries/count_report_builder_spec.rb
@@ -0,0 +1,113 @@
+require 'rails_helper'
+
+describe V2::Reports::Timeseries::CountReportBuilder do
+  subject { described_class.new(account, params) }
+
+  let(:account) { create(:account) }
+  let(:account2) { create(:account) }
+  let(:user) { create(:user, email: 'agent1@example.com') }
+  let(:inbox) { create(:inbox, account: account) }
+  let(:inbox2) { create(:inbox, account: account2) }
+  let(:current_time) { Time.current }
+
+  let(:params) do
+    {
+      type: 'agent',
+      metric: 'resolutions_count',
+      since: (current_time - 1.day).beginning_of_day.to_i.to_s,
+      until: current_time.end_of_day.to_i.to_s,
+      id: user.id.to_s
+    }
+  end
+
+  before do
+    travel_to current_time
+
+    # Add the same user to both accounts
+    create(:account_user, account: account, user: user)
+    create(:account_user, account: account2, user: user)
+
+    # Create conversations in account1
+    conversation1 = create(:conversation, account: account, inbox: inbox, assignee: user)
+    conversation2 = create(:conversation, account: account, inbox: inbox, assignee: user)
+
+    # Create conversations in account2
+    conversation3 = create(:conversation, account: account2, inbox: inbox2, assignee: user)
+    conversation4 = create(:conversation, account: account2, inbox: inbox2, assignee: user)
+
+    # User resolves 2 conversations in account1
+    create(:reporting_event,
+           name: 'conversation_resolved',
+           account: account,
+           user: user,
+           conversation: conversation1,
+           created_at: current_time - 12.hours)
+
+    create(:reporting_event,
+           name: 'conversation_resolved',
+           account: account,
+           user: user,
+           conversation: conversation2,
+           created_at: current_time - 6.hours)
+
+    # Same user resolves 3 conversations in account2 - these should NOT be counted for account1
+    create(:reporting_event,
+           name: 'conversation_resolved',
+           account: account2,
+           user: user,
+           conversation: conversation3,
+           created_at: current_time - 8.hours)
+
+    create(:reporting_event,
+           name: 'conversation_resolved',
+           account: account2,
+           user: user,
+           conversation: conversation4,
+           created_at: current_time - 4.hours)
+
+    # Create another conversation in account2 for testing
+    conversation5 = create(:conversation, account: account2, inbox: inbox2, assignee: user)
+    create(:reporting_event,
+           name: 'conversation_resolved',
+           account: account2,
+           user: user,
+           conversation: conversation5,
+           created_at: current_time - 2.hours)
+  end
+
+  describe '#aggregate_value' do
+    it 'returns only resolutions performed by the user in the specified account' do
+      # User should have 2 resolutions in account1, not 5 (total across both accounts)
+      expect(subject.aggregate_value).to eq(2)
+    end
+
+    context 'when querying account2' do
+      subject { described_class.new(account2, params) }
+
+      it 'returns only resolutions for account2' do
+        # User should have 3 resolutions in account2
+        expect(subject.aggregate_value).to eq(3)
+      end
+    end
+  end
+
+  describe '#timeseries' do
+    it 'filters resolutions by account' do
+      result = subject.timeseries
+      # Should only count the 2 resolutions from account1
+      total_count = result.sum { |r| r[:value] }
+      expect(total_count).to eq(2)
+    end
+  end
+
+  describe 'account isolation' do
+    it 'does not leak data between accounts' do
+      # If account isolation works correctly, the counts should be different
+      account1_count = described_class.new(account, params).aggregate_value
+      account2_count = described_class.new(account2, params).aggregate_value
+
+      expect(account1_count).to eq(2)
+      expect(account2_count).to eq(3)
+    end
+  end
+end