diff --git a/app/models/organisation.rb b/app/models/organisation.rb
index 077f0413e..da6a92d0d 100644
--- a/app/models/organisation.rb
+++ b/app/models/organisation.rb
@@ -25,6 +25,11 @@ class Organisation < ApplicationRecord
       ids << id
     end
 
+    absorbed_organisations.each do |organisation|
+      ids.concat(organisation.stock_owners.pluck(:id))
+      ids << organisation.id if organisation.holds_own_stock?
+    end
+
     ids.concat(stock_owners.pluck(:id))
 
     Organisation.where(id: ids)
diff --git a/app/services/bulk_upload/lettings/year2023/row_parser.rb b/app/services/bulk_upload/lettings/year2023/row_parser.rb
index 585ec7c93..25b00302c 100644
--- a/app/services/bulk_upload/lettings/year2023/row_parser.rb
+++ b/app/services/bulk_upload/lettings/year2023/row_parser.rb
@@ -540,11 +540,11 @@ private
 
   def validate_created_by_related
     return unless created_by
+    return if created_by.organisation == owning_organisation || created_by.organisation == managing_organisation
+    return if created_by.organisation == owning_organisation&.absorbing_organisation || created_by.organisation == managing_organisation&.absorbing_organisation
 
-    unless (created_by.organisation == owning_organisation) || (created_by.organisation == managing_organisation)
-      block_log_creation!
-      errors.add(:field_3, "User must be related to owning organisation or managing organisation")
-    end
+    block_log_creation!
+    errors.add(:field_3, "User must be related to owning organisation or managing organisation")
   end
 
   def created_by
diff --git a/app/services/bulk_upload/sales/year2023/row_parser.rb b/app/services/bulk_upload/sales/year2023/row_parser.rb
index 6ce207abf..c83c9161a 100644
--- a/app/services/bulk_upload/sales/year2023/row_parser.rb
+++ b/app/services/bulk_upload/sales/year2023/row_parser.rb
@@ -1195,11 +1195,10 @@ private
 
   def validate_created_by_related
     return unless created_by
+    return if created_by.organisation == owning_organisation || created_by.organisation == owning_organisation&.absorbing_organisation
 
-    unless created_by.organisation == owning_organisation
-      block_log_creation!
-      errors.add(:field_2, "User must be related to owning organisation", category: :setup)
-    end
+    block_log_creation!
+    errors.add(:field_2, "User must be related to owning organisation", category: :setup)
   end
 
   def setup_question?(question)
diff --git a/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb b/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
index 86e45ca2d..af713d29b 100644
--- a/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2023/row_parser_spec.rb
@@ -1384,6 +1384,28 @@ RSpec.describe BulkUpload::Lettings::Year2023::RowParser do
           expect(parser).to be_block_log_creation
         end
       end
+
+      context "when user's org has absorbed owning organisation" do
+        let(:merged_org) { create(:organisation, :with_old_visible_id, holds_own_stock: true) }
+        let(:merged_org_stock_owner) { create(:organisation, :with_old_visible_id, holds_own_stock: true) }
+
+        let(:attributes) { { bulk_upload:, field_1: merged_org_stock_owner.old_visible_id, field_2: merged_org.old_visible_id, field_3: user.email } }
+
+        before do
+          create(:organisation_relationship, parent_organisation: merged_org_stock_owner, child_organisation: merged_org)
+          merged_org.update!(absorbing_organisation: user.organisation, merge_date: Time.zone.today)
+          merged_org.reload
+          user.organisation.reload
+        end
+
+        it "is permitted" do
+          parser = described_class.new(attributes)
+
+          parser.valid?
+          expect(parser.errors.where(:field_1)).not_to be_present
+          expect(parser.errors.where(:field_3)).not_to be_present
+        end
+      end
     end
 
     describe "#field_2" do # managing org
diff --git a/spec/services/bulk_upload/sales/year2023/row_parser_spec.rb b/spec/services/bulk_upload/sales/year2023/row_parser_spec.rb
index 0745274fc..408ce099b 100644
--- a/spec/services/bulk_upload/sales/year2023/row_parser_spec.rb
+++ b/spec/services/bulk_upload/sales/year2023/row_parser_spec.rb
@@ -417,6 +417,46 @@ RSpec.describe BulkUpload::Sales::Year2023::RowParser do
           expect(parser).to be_block_log_creation
         end
       end
+
+      context "when user's org has absorbed owning organisation with stock owners" do
+        let(:merged_org) { create(:organisation, :with_old_visible_id, holds_own_stock: true) }
+        let(:merged_org_stock_owner) { create(:organisation, :with_old_visible_id, holds_own_stock: true) }
+
+        let(:attributes) { { bulk_upload:, field_1: merged_org_stock_owner.old_visible_id } }
+
+        before do
+          create(:organisation_relationship, parent_organisation: merged_org_stock_owner, child_organisation: merged_org)
+          merged_org.update!(absorbing_organisation: user.organisation, merge_date: Time.zone.today)
+          merged_org.reload
+          user.organisation.reload
+        end
+
+        it "is permitted" do
+          parser.valid?
+          expect(parser.errors.where(:field_1)).not_to be_present
+        end
+      end
+
+      context "when user's org has absorbed owning organisation" do
+        let(:merged_org) { create(:organisation, :with_old_visible_id, holds_own_stock: true) }
+
+        let(:attributes) { { bulk_upload:, field_1: merged_org.old_visible_id, field_2: user.email } }
+
+        before do
+          merged_org.update!(absorbing_organisation: user.organisation, merge_date: Time.zone.today)
+          merged_org.reload
+          user.organisation.reload
+          user.reload
+        end
+
+        it "is permitted" do
+          parser = described_class.new(attributes)
+
+          parser.valid?
+          expect(parser.errors.where(:field_1)).not_to be_present
+          expect(parser.errors.where(:field_2)).not_to be_present
+        end
+      end
     end
 
     describe "#field_2" do # username for created_by