diff --git a/app/controllers/api/ownership_transfers_controller.rb b/app/controllers/api/ownership_transfers_controller.rb
new file mode 100644
index 000000000..5c4775585
--- /dev/null
+++ b/app/controllers/api/ownership_transfers_controller.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+module Api
+  class OwnershipTransfersController < ApiController
+    before_action :authorize_user
+    load_and_authorize_resource :school
+    authorize_resource :ownership_transfer, class: false
+
+    def show
+      @ownership_transfer = most_recent_ownership_transfer
+
+      if @ownership_transfer.blank? || cannot?(:read, @ownership_transfer)
+        head :not_found
+      elsif current_user_is_requester?
+        render json: { status: @ownership_transfer.status, you_are: 'owner', nominee_name: nominee_name }, status: :ok
+      else
+        render json: { status: @ownership_transfer.status, you_are: 'nominee' }, status: :ok
+      end
+    end
+
+    def create
+      result = OwnershipTransfer::Create.call(school: @school, nominated_user_id:, requested_by_user_id: current_user.id)
+
+      if result.success?
+        head :created
+      else
+        render json: { error: result[:error] }, status: :unprocessable_content
+      end
+    end
+
+    private
+
+    def ownership_transfer_params
+      params.expect(ownership_transfer: [:nominated_user_id])
+    end
+
+    def nominated_user_id
+      ownership_transfer_params[:nominated_user_id]
+    end
+
+    def most_recent_ownership_transfer
+      @school.ownership_transfers.order(created_at: :desc).first
+    end
+
+    def current_user_is_requester?
+      @ownership_transfer.requested_by_user_id == current_user.id
+    end
+
+    def nominee_name
+      User.from_userinfo(ids: @ownership_transfer.nominated_user_id).first&.name
+    end
+  end
+end
diff --git a/app/models/ability.rb b/app/models/ability.rb
index c5c096990..ac365cee3 100644
--- a/app/models/ability.rb
+++ b/app/models/ability.rb
@@ -39,6 +39,9 @@ def define_authenticated_abilities(user)
         invitation.email_address.present? &&
         invitation.email_address.casecmp?(user.email)
     end
+    can :read, OwnershipTransfer do |transfer|
+      user.id == transfer.requested_by_user_id || user.id == transfer.nominated_user_id
+    end
   end
 
   def define_authenticated_non_student_abilities(user)
@@ -82,6 +85,7 @@ def define_school_owner_abilities(school:)
     can(%i[read create create_batch destroy], ClassStudent, school_class: { school: { id: school.id } })
     can(%i[read create destroy], :school_owner)
     can(%i[read create destroy], :school_teacher)
+    can(%i[read create], :ownership_transfer)
     can(%i[read create create_batch update destroy destroy_batch], :school_student)
     can(%i[create create_copy], Lesson, school_id: school.id)
     can(%i[read update destroy], Lesson, school_id: school.id, visibility: %w[teachers students public])
@@ -98,6 +102,7 @@ def define_school_teacher_abilities(user:, school:)
     can(%i[read create create_batch destroy], ClassStudent, school_class: { school: { id: school.id }, teachers: { teacher_id: user.id } })
     can(%i[read], :school_owner)
     can(%i[read], :school_teacher)
+    can(:read, :ownership_transfer)
     can(%i[read create create_batch update], :school_student)
     can(%i[create update destroy], Lesson) do |lesson|
       school_teacher_can_manage_lesson?(user:, school:, lesson:)
diff --git a/app/models/ownership_transfer.rb b/app/models/ownership_transfer.rb
index d364b8234..b74102682 100644
--- a/app/models/ownership_transfer.rb
+++ b/app/models/ownership_transfer.rb
@@ -13,6 +13,9 @@ class OwnershipTransfer < ApplicationRecord
   validates :requested_by_user_id, presence: true
   validates :email_address,
             format: { with: EmailValidator.regexp, message: I18n.t('validations.invitation.email_address') }
+  validates :school_id,
+            uniqueness: { conditions: -> { where(status: :pending) }, message: I18n.t('validations.ownership_transfer.school_pending') },
+            on: :create
   validate :nominee_has_the_school_owner_or_school_teacher_role_for_the_school
 
   after_create_commit :send_ownership_transfer_request_email
@@ -23,7 +26,7 @@ class OwnershipTransfer < ApplicationRecord
   def nominee_has_the_school_owner_or_school_teacher_role_for_the_school
     return unless nominated_user_id_changed? && errors.blank? && school
 
-    return if school.roles.exists?(user_id: nominated_user_id, role: %i[owner teacher])
+    return if school.owner_or_teacher?(nominated_user_id)
 
     msg = "'#{nominated_user_id}' does not have the 'owner' or 'teacher' role for school '#{school.id}'"
     errors.add(:nominated_user_id, msg)
diff --git a/app/models/school.rb b/app/models/school.rb
index 479d9bd96..abf010d36 100644
--- a/app/models/school.rb
+++ b/app/models/school.rb
@@ -133,6 +133,10 @@ def student_count
     roles.student.count
   end
 
+  def owner_or_teacher?(user_id)
+    roles.exists?(user_id:, role: %i[owner teacher])
+  end
+
   def postal_code=(str)
     super(str.to_s.upcase)
   end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 7c9c88e49..efd4f0193 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -23,6 +23,8 @@ en:
       school_roll_number_exists: "School roll number already exists"
     invitation:
       email_address: "'%<value>s' is invalid"
+    ownership_transfer:
+      school_pending: "already has a pending ownership transfer"
   activerecord:
     attributes:
       school_class:
diff --git a/config/routes.rb b/config/routes.rb
index 56c04b11b..ba8945c18 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -87,6 +87,7 @@
 
       resources :owners, only: %i[index], controller: 'school_owners'
       resources :teachers, only: %i[index create], controller: 'school_teachers'
+      resource :ownership_transfer, only: %i[show create], controller: 'ownership_transfers'
       resources :students, only: %i[index create update destroy], controller: 'school_students' do
         post :batch, on: :collection, to: 'school_students#create_batch'
         delete :batch, on: :collection, to: 'school_students#destroy_batch'
diff --git a/db/migrate/20260915100000_add_unique_pending_index_to_ownership_transfers.rb b/db/migrate/20260915100000_add_unique_pending_index_to_ownership_transfers.rb
new file mode 100644
index 000000000..10360484b
--- /dev/null
+++ b/db/migrate/20260915100000_add_unique_pending_index_to_ownership_transfers.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class AddUniquePendingIndexToOwnershipTransfers < ActiveRecord::Migration[8.1]
+  disable_ddl_transaction!
+
+  def change
+    add_index :ownership_transfers, :school_id,
+              unique: true,
+              where: "status = 'pending'",
+              name: 'index_ownership_transfers_on_school_id_when_pending',
+              algorithm: :concurrently
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 8c7c8e2df..10401ac92 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2026_09_15_093824) do
+ActiveRecord::Schema[8.1].define(version: 2026_09_15_100000) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
   enable_extension "pgcrypto"
@@ -232,6 +232,7 @@
     t.string "status", default: "pending", null: false
     t.datetime "updated_at", null: false
     t.index ["school_id"], name: "index_ownership_transfers_on_school_id"
+    t.index ["school_id"], name: "index_ownership_transfers_on_school_id_when_pending", unique: true, where: "((status)::text = 'pending'::text)"
   end
 
   create_table "project_errors", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
diff --git a/lib/concepts/ownership_transfer/create.rb b/lib/concepts/ownership_transfer/create.rb
new file mode 100644
index 000000000..c8d323819
--- /dev/null
+++ b/lib/concepts/ownership_transfer/create.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+class OwnershipTransfer
+  class Create
+    class << self
+      def call(school:, nominated_user_id:, requested_by_user_id:)
+        response = OperationResponse.new
+        ownership_transfer = build_ownership_transfer(school:, nominated_user_id:, requested_by_user_id:)
+
+        if ownership_transfer.save
+          response[:ownership_transfer] = ownership_transfer
+        else
+          response[:error] = ownership_transfer.errors
+        end
+
+        response
+      rescue ActiveRecord::RecordNotUnique
+        response ||= OperationResponse.new
+        ownership_transfer.errors.add(:school_id, I18n.t('validations.ownership_transfer.school_pending'))
+        response[:error] = ownership_transfer.errors
+        response
+      rescue StandardError => e
+        response ||= OperationResponse.new
+        Sentry.capture_exception(e)
+        response[:error] = "Error creating ownership transfer: #{e}"
+        response
+      end
+
+      private
+
+      def build_ownership_transfer(school:, nominated_user_id:, requested_by_user_id:)
+        email_address = nominee_email(school:, nominated_user_id:)
+        OwnershipTransfer.new(school:, nominated_user_id:, requested_by_user_id:, email_address:)
+      end
+
+      def nominee_email(school:, nominated_user_id:)
+        return unless school.owner_or_teacher?(nominated_user_id)
+
+        User.from_userinfo(ids: nominated_user_id).first&.email
+      end
+    end
+  end
+end
diff --git a/spec/concepts/ownership_transfer/create_spec.rb b/spec/concepts/ownership_transfer/create_spec.rb
new file mode 100644
index 000000000..d4d6677e1
--- /dev/null
+++ b/spec/concepts/ownership_transfer/create_spec.rb
@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe OwnershipTransfer::Create, type: :unit do
+  let(:school) { create(:verified_school) }
+  let(:owner) { create(:owner, school:) }
+  let(:nominee) { create(:teacher, school:) }
+
+  before { stub_user_info_api_for(nominee) }
+
+  it 'returns a successful response and creates the transfer' do
+    response = described_class.call(school:, nominated_user_id: nominee.id, requested_by_user_id: owner.id)
+
+    expect(response.success?).to be(true)
+    expect(response[:ownership_transfer]).to have_attributes(
+      school:,
+      nominated_user_id: nominee.id,
+      requested_by_user_id: owner.id,
+      email_address: nominee.email
+    )
+  end
+
+  it 'returns a failure response when the nominee has no role at the school' do
+    response = described_class.call(school:, nominated_user_id: SecureRandom.uuid, requested_by_user_id: owner.id)
+
+    expect(response.failure?).to be(true)
+    expect(response[:error]).to be_present
+  end
+
+  context 'when a duplicate pending transfer is created concurrently' do
+    before do
+      allow(OwnershipTransfer).to receive(:new).and_wrap_original do |method, *args|
+        method.call(*args).tap do |ownership_transfer|
+          allow(ownership_transfer).to receive(:save).and_raise(ActiveRecord::RecordNotUnique)
+        end
+      end
+    end
+
+    it 'returns the same friendly error a non-concurrent duplicate would get, not the raw exception' do
+      response = described_class.call(school:, nominated_user_id: nominee.id, requested_by_user_id: owner.id)
+
+      expect(response.failure?).to be(true)
+      expect(response[:error][:school_id]).to include('already has a pending ownership transfer')
+    end
+
+    it 'does not report the race to Sentry, since it is an expected, handled outcome' do
+      allow(Sentry).to receive(:capture_exception)
+
+      described_class.call(school:, nominated_user_id: nominee.id, requested_by_user_id: owner.id)
+
+      expect(Sentry).not_to have_received(:capture_exception)
+    end
+  end
+
+  context 'when an unexpected error occurs' do
+    before do
+      allow(OwnershipTransfer).to receive(:new).and_raise(StandardError, 'boom')
+      allow(Sentry).to receive(:capture_exception)
+    end
+
+    it 'reports it to Sentry and returns a generic error' do
+      response = described_class.call(school:, nominated_user_id: nominee.id, requested_by_user_id: owner.id)
+
+      expect(Sentry).to have_received(:capture_exception)
+      expect(response.failure?).to be(true)
+      expect(response[:error]).to include('Error creating ownership transfer')
+    end
+  end
+end
diff --git a/spec/features/ownership_transfer/creating_an_ownership_transfer_spec.rb b/spec/features/ownership_transfer/creating_an_ownership_transfer_spec.rb
new file mode 100644
index 000000000..646f16713
--- /dev/null
+++ b/spec/features/ownership_transfer/creating_an_ownership_transfer_spec.rb
@@ -0,0 +1,139 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Creating an ownership transfer', type: :request do
+  include ActionMailer::TestHelper
+
+  include_context 'with a school owner and nominated teacher'
+
+  let(:params) { { ownership_transfer: { nominated_user_id: nominee.id } } }
+
+  before do
+    stub_user_info_api_for(nominee)
+  end
+
+  it 'responds 401 Unauthorized when no token is given' do
+    post("/api/schools/#{school.id}/ownership_transfer", params:)
+    expect(response).to have_http_status(:unauthorized)
+  end
+
+  it 'responds 403 Forbidden when the user is a school-teacher' do
+    authenticated_in_hydra_as(nominee)
+
+    post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+    expect(response).to have_http_status(:forbidden)
+  end
+
+  it 'responds 403 Forbidden when the user is a school-student' do
+    student = create(:student, school:)
+    authenticated_in_hydra_as(student)
+
+    post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+    expect(response).to have_http_status(:forbidden)
+  end
+
+  it 'responds 403 Forbidden when the user is the owner of a different school' do
+    authenticated_in_hydra_as(owner)
+    Role.owner.find_by(user_id: owner.id, school:).delete
+    Role.teacher.find_by(user_id: nominee.id, school:).delete
+    school.update!(id: SecureRandom.uuid)
+
+    post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+    expect(response).to have_http_status(:forbidden)
+  end
+
+  context 'when the current user is the school owner' do
+    before { authenticated_in_hydra_as(owner) }
+
+    context 'when the nominee has the teacher role at the school' do
+      it 'responds 201 Created' do
+        post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+        expect(response).to have_http_status(:created)
+      end
+
+      it 'creates an ownership transfer for the nominee' do
+        expect do
+          post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+        end.to change(OwnershipTransfer, :count).by(1)
+
+        expect(OwnershipTransfer.last).to have_attributes(
+          school:,
+          nominated_user_id: nominee.id,
+          requested_by_user_id: owner.id,
+          email_address: nominee.email,
+          status: 'pending'
+        )
+      end
+
+      it 'sends the ownership transfer request email' do
+        post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+
+        assert_enqueued_email_with(
+          SchoolOwnershipMailer,
+          :request_ownership_transfer,
+          params: { ownership_transfer: OwnershipTransfer.last }
+        )
+      end
+    end
+
+    context 'when the nominee does not have the owner or teacher role at the school' do
+      let(:params) { { ownership_transfer: { nominated_user_id: SecureRandom.uuid } } }
+
+      it 'responds 422 Unprocessable entity' do
+        post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+        expect(response).to have_http_status(:unprocessable_content)
+      end
+
+      it 'includes a validation error in the response body' do
+        post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+
+        json = JSON.parse(response.body)
+        expect(json['error']).to be_present
+      end
+
+      it 'does not create an ownership transfer' do
+        expect do
+          post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+        end.not_to change(OwnershipTransfer, :count)
+      end
+    end
+
+    context 'when a transfer is already pending for the school' do
+      before { create(:ownership_transfer, school:, nominated_user_id: nominee.id) }
+
+      it 'responds 422 Unprocessable entity' do
+        post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+        expect(response).to have_http_status(:unprocessable_content)
+      end
+
+      it 'includes the pending-transfer error in the response body' do
+        post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+
+        json = JSON.parse(response.body)
+        expect(json['error']['school_id']).to include('already has a pending ownership transfer')
+      end
+
+      it 'does not create a second ownership transfer' do
+        expect do
+          post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+        end.not_to change(OwnershipTransfer, :count)
+      end
+    end
+
+    context 'when a transfer for the school is no longer pending' do
+      before { create(:ownership_transfer, school:, nominated_user_id: nominee.id, status: :completed) }
+
+      it 'responds 201 Created' do
+        post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+        expect(response).to have_http_status(:created)
+      end
+
+      it 'creates a new ownership transfer' do
+        expect do
+          post("/api/schools/#{school.id}/ownership_transfer", params:, headers:)
+        end.to change(OwnershipTransfer, :count).by(1)
+      end
+    end
+  end
+end
diff --git a/spec/features/ownership_transfer/viewing_ownership_transfer_status_spec.rb b/spec/features/ownership_transfer/viewing_ownership_transfer_status_spec.rb
new file mode 100644
index 000000000..31d1bce02
--- /dev/null
+++ b/spec/features/ownership_transfer/viewing_ownership_transfer_status_spec.rb
@@ -0,0 +1,170 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Viewing ownership transfer status', type: :request do
+  include_context 'with a school owner and nominated teacher'
+
+  it 'responds 401 Unauthorized when no token is given' do
+    get("/api/schools/#{school.id}/ownership_transfer")
+    expect(response).to have_http_status(:unauthorized)
+  end
+
+  it 'responds 403 Forbidden when the user is a school-student' do
+    student = create(:student, school:)
+    authenticated_in_hydra_as(student)
+
+    get("/api/schools/#{school.id}/ownership_transfer", headers:)
+    expect(response).to have_http_status(:forbidden)
+  end
+
+  context 'when the school has never had an ownership transfer' do
+    before { authenticated_in_hydra_as(owner) }
+
+    it 'responds 404 Not Found' do
+      get("/api/schools/#{school.id}/ownership_transfer", headers:)
+      expect(response).to have_http_status(:not_found)
+    end
+  end
+
+  context 'when there is a pending transfer for the school' do
+    let!(:ownership_transfer) do
+      create(
+        :ownership_transfer,
+        school:,
+        nominated_user_id: nominee.id,
+        requested_by_user_id: owner.id,
+        email_address: nominee.email
+      )
+    end
+
+    context 'when the current user is the school owner' do
+      before do
+        stub_user_info_api_for(nominee)
+        authenticated_in_hydra_as(owner)
+      end
+
+      it 'responds 200 OK' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+        expect(response).to have_http_status(:ok)
+      end
+
+      it 'identifies the current user as the owner' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+
+        json = JSON.parse(response.body)
+        expect(json['you_are']).to eq('owner')
+      end
+
+      it 'includes the nominated teacher\'s name' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+
+        json = JSON.parse(response.body)
+        expect(json['nominee_name']).to eq(nominee.name)
+      end
+
+      it 'includes the transfer status' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+
+        json = JSON.parse(response.body)
+        expect(json['status']).to eq('pending')
+      end
+    end
+
+    context 'when the current user is the nominee' do
+      before { authenticated_in_hydra_as(nominee) }
+
+      it 'responds 200 OK' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+        expect(response).to have_http_status(:ok)
+      end
+
+      it 'identifies the current user as the nominee' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+
+        json = JSON.parse(response.body)
+        expect(json['you_are']).to eq('nominee')
+      end
+
+      it 'includes the transfer status' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+
+        json = JSON.parse(response.body)
+        expect(json['status']).to eq('pending')
+      end
+    end
+
+    context 'when the current user is a different teacher at the school' do
+      let(:other_teacher) { create(:teacher, school:) }
+
+      before { authenticated_in_hydra_as(other_teacher) }
+
+      it_behaves_like 'a hidden ownership transfer'
+    end
+
+    context 'when the current user is a different owner of the school who did not request the transfer' do
+      let(:other_owner) { create(:owner, school:) }
+
+      before { authenticated_in_hydra_as(other_owner) }
+
+      it_behaves_like 'a hidden ownership transfer'
+    end
+
+    context 'when the transfer has completed' do
+      before do
+        ownership_transfer.update!(status: :completed)
+        stub_user_info_api_for(nominee)
+        authenticated_in_hydra_as(owner)
+      end
+
+      it 'responds 200 OK, still visible to the requester' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+
+        expect(response).to have_http_status(:ok)
+        json = JSON.parse(response.body)
+        expect(json).to include('status' => 'completed', 'you_are' => 'owner', 'nominee_name' => nominee.name)
+      end
+    end
+
+    context 'when the transfer was rejected' do
+      before do
+        ownership_transfer.update!(status: :rejected)
+        authenticated_in_hydra_as(nominee)
+      end
+
+      it 'responds 200 OK, still visible to the nominee who rejected it' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+
+        expect(response).to have_http_status(:ok)
+        json = JSON.parse(response.body)
+        expect(json).to include('status' => 'rejected', 'you_are' => 'nominee')
+      end
+    end
+
+    context 'when the transfer was cancelled' do
+      before do
+        ownership_transfer.update!(status: :cancelled)
+        authenticated_in_hydra_as(nominee)
+      end
+
+      it 'responds 200 OK, still visible to the nominee' do
+        get("/api/schools/#{school.id}/ownership_transfer", headers:)
+
+        expect(response).to have_http_status(:ok)
+        json = JSON.parse(response.body)
+        expect(json).to include('status' => 'cancelled', 'you_are' => 'nominee')
+      end
+    end
+
+    context 'when a resolved transfer is viewed by someone who was never involved' do
+      let(:other_teacher) { create(:teacher, school:) }
+
+      before do
+        ownership_transfer.update!(status: :completed)
+        authenticated_in_hydra_as(other_teacher)
+      end
+
+      it_behaves_like 'a hidden ownership transfer'
+    end
+  end
+end
diff --git a/spec/models/ownership_transfer_spec.rb b/spec/models/ownership_transfer_spec.rb
index e9dede049..814496ac2 100644
--- a/spec/models/ownership_transfer_spec.rb
+++ b/spec/models/ownership_transfer_spec.rb
@@ -52,6 +52,44 @@
     end
   end
 
+  describe 'pending transfer uniqueness' do
+    it 'is invalid when the school already has a pending transfer' do
+      create(:ownership_transfer, school:, nominated_user_id: nominee.id)
+
+      second_transfer = build(:ownership_transfer, school:, nominated_user_id: nominee.id)
+
+      expect(second_transfer).not_to be_valid
+      expect(second_transfer.errors[:school_id]).to include('already has a pending ownership transfer')
+    end
+
+    it 'is valid for a second school even when another school has a pending transfer' do
+      create(:ownership_transfer, school:, nominated_user_id: nominee.id)
+
+      other_school = create(:verified_school)
+      other_nominee = create(:teacher, school: other_school)
+      second_transfer = build(:ownership_transfer, school: other_school, nominated_user_id: other_nominee.id)
+
+      expect(second_transfer).to be_valid
+    end
+
+    it "is valid when the school's only existing transfer is no longer pending" do
+      create(:ownership_transfer, school:, nominated_user_id: nominee.id, status: :completed)
+
+      second_transfer = build(:ownership_transfer, school:, nominated_user_id: nominee.id)
+
+      expect(second_transfer).to be_valid
+    end
+
+    it 'rejects a duplicate pending transfer created concurrently, bypassing application-level validation' do
+      first_transfer = build(:ownership_transfer, school:, nominated_user_id: nominee.id)
+      second_transfer = build(:ownership_transfer, school:, nominated_user_id: nominee.id)
+
+      first_transfer.save!(validate: false)
+
+      expect { second_transfer.save!(validate: false) }.to raise_error(ActiveRecord::RecordNotUnique)
+    end
+  end
+
   describe 'status' do
     it 'defaults to pending on a new record' do
       expect(ownership_transfer.status).to eq('pending')
diff --git a/spec/models/school_spec.rb b/spec/models/school_spec.rb
index 0d1382d33..3fcb0b829 100644
--- a/spec/models/school_spec.rb
+++ b/spec/models/school_spec.rb
@@ -44,7 +44,13 @@
     it 'has many ownership transfers' do
       owner_one = create(:owner_role, school:)
       owner_two = create(:owner_role, school:)
-      create(:ownership_transfer, school:, requested_by_user_id: owner_one.user_id, nominated_user_id: owner_one.user_id)
+      create(
+        :ownership_transfer,
+        school:,
+        requested_by_user_id: owner_one.user_id,
+        nominated_user_id: owner_one.user_id,
+        status: :completed
+      )
       create(:ownership_transfer, school:, requested_by_user_id: owner_two.user_id, nominated_user_id: owner_two.user_id)
 
       expect(school.ownership_transfers.size).to eq(2)
@@ -111,6 +117,25 @@
     end
   end
 
+  describe '#owner_or_teacher?' do
+    it 'is true for a user with the owner role at the school' do
+      owner = create(:owner, school:)
+      expect(school.owner_or_teacher?(owner.id)).to be(true)
+    end
+
+    it 'is true for a user with the teacher role at the school' do
+      expect(school.owner_or_teacher?(teacher.id)).to be(true)
+    end
+
+    it 'is false for a user with only the student role at the school' do
+      expect(school.owner_or_teacher?(student.id)).to be(false)
+    end
+
+    it 'is false for a user with no role at the school' do
+      expect(school.owner_or_teacher?(SecureRandom.uuid)).to be(false)
+    end
+  end
+
   describe 'validations' do
     subject(:school) { create(:school) }
 
diff --git a/spec/support/shared_contexts/ownership_transfer_context.rb b/spec/support/shared_contexts/ownership_transfer_context.rb
new file mode 100644
index 000000000..6f5d8fb20
--- /dev/null
+++ b/spec/support/shared_contexts/ownership_transfer_context.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+RSpec.shared_context 'with a school owner and nominated teacher' do
+  let(:headers) { { Authorization: UserProfileMock::TOKEN } }
+  let(:school) { create(:school) }
+  let(:owner) { create(:owner, school:) }
+  let(:nominee) { create(:teacher, school:) }
+end
diff --git a/spec/support/shared_examples/ownership_transfer_examples.rb b/spec/support/shared_examples/ownership_transfer_examples.rb
new file mode 100644
index 000000000..c1ad78d32
--- /dev/null
+++ b/spec/support/shared_examples/ownership_transfer_examples.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+RSpec.shared_examples 'a hidden ownership transfer' do
+  it 'responds 404 Not Found, without revealing that a transfer exists' do
+    get("/api/schools/#{school.id}/ownership_transfer", headers:)
+    expect(response).to have_http_status(:not_found)
+  end
+end