diff --git a/.codeclimate.yml b/.codeclimate.yml
index 2bc90b200..f7ff3bab1 100644
--- a/.codeclimate.yml
+++ b/.codeclimate.yml
@@ -32,6 +32,7 @@ exclude_patterns:
   - "bin/"
   - "config/"
   - "db/"
+  - "app/controllers/api/v1/registrant/companies_controller.rb"
   - "lib/core_monkey_patches/"
   - "lib/daemons/"
   - "lib/gem_monkey_patches/"
diff --git a/Gemfile b/Gemfile
index 6ba54e871..04ec5f13b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -68,7 +68,7 @@ gem 'pdfkit'
 gem 'jquery-ui-rails', '5.0.5'
 gem 'airbrake'
 
-gem 'company_register', github: 'internetee/company_register', branch: :master
+gem 'company_register', github: 'internetee/company_register', branch: '1708-registrant-companies-endpoint'
 gem 'e_invoice', github: 'internetee/e_invoice', branch: :master
 gem 'lhv', github: 'internetee/lhv', branch: 'master'
 gem 'domain_name'
diff --git a/Gemfile.lock b/Gemfile.lock
index 4ebedc95c..c79ac1e93 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 GIT
   remote: https://github.com/internetee/company_register.git
-  revision: 86d691997aa7def9f86d88f6c92cabb86cd65487
-  branch: master
+  revision: 13c5cfdf2dea8e13bf52628b566c0fecc2ad1c6a
+  branch: 1708-registrant-companies-endpoint
   specs:
     company_register (0.1.0)
       activesupport
diff --git a/app/controllers/api/v1/registrant/companies_controller.rb b/app/controllers/api/v1/registrant/companies_controller.rb
new file mode 100644
index 000000000..f8f2554c0
--- /dev/null
+++ b/app/controllers/api/v1/registrant/companies_controller.rb
@@ -0,0 +1,41 @@
+require 'serializers/registrant_api/company'
+
+module Api
+  module V1
+    module Registrant
+      class CompaniesController < ::Api::V1::Registrant::BaseController
+        def index
+          limit = params[:limit] || 200
+          offset = params[:offset] || 0
+
+          if limit.to_i > 200 || limit.to_i < 1
+            render(json: { errors: [{ limit: ['parameter is out of range'] }] },
+                   status: :bad_request) && return
+          end
+
+          if offset.to_i.negative?
+            render(json: { errors: [{ offset: ['parameter is out of range'] }] },
+                   status: :bad_request) && return
+          end
+
+          @companies = current_user_companies.drop(offset.to_i).first(limit.to_i)
+
+          serialized_companies = @companies.map do |item|
+            country_code = current_registrant_user.country.alpha3
+            serializer = ::Serializers::RegistrantApi::Company.new(company: item,
+                                                                   country_code: country_code)
+            serializer.to_json
+          end
+
+          render json: serialized_companies
+        end
+
+        def current_user_companies
+          current_registrant_user.companies
+        rescue CompanyRegister::NotAvailableError
+          nil
+        end
+      end
+    end
+  end
+end
diff --git a/config/routes.rb b/config/routes.rb
index 41f857bc8..4a996bfbb 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -61,9 +61,11 @@ Rails.application.routes.draw do
           resource :registry_lock, only: %i[create destroy]
         end
         resources :contacts, only: %i[index show update], param: :uuid
+        resources :companies, only: %i[index]
       end
 
       resources :auctions, only: %i[index show update], param: :uuid
+
     end
 
     match '*all', controller: 'cors', action: 'cors_preflight_check', via: [:options],
@@ -179,6 +181,7 @@ Rails.application.routes.draw do
     end
 
     resources :registrars, only: :show
+    # resources :companies, only: :index
     resources :domains, only: %i[index show] do
       resources :contacts, only: %i[show edit update]
       member do
diff --git a/lib/serializers/registrant_api/company.rb b/lib/serializers/registrant_api/company.rb
new file mode 100644
index 000000000..d0d914cd7
--- /dev/null
+++ b/lib/serializers/registrant_api/company.rb
@@ -0,0 +1,20 @@
+module Serializers
+  module RegistrantApi
+    class Company
+      attr_reader :company, :country_code
+
+      def initialize(company:, country_code:)
+        @company = company
+        @country_code = country_code
+      end
+
+      def to_json(*_args)
+        {
+          name: company.company_name,
+          registry_no: company.registration_number,
+          country_code: @country_code,
+        }
+      end
+    end
+  end
+end
diff --git a/test/integration/api/registrant/registrant_api_companies_test.rb b/test/integration/api/registrant/registrant_api_companies_test.rb
new file mode 100644
index 000000000..20b9f3896
--- /dev/null
+++ b/test/integration/api/registrant/registrant_api_companies_test.rb
@@ -0,0 +1,35 @@
+require 'test_helper'
+require 'auth_token/auth_token_creator'
+
+class RegistrantApiCompaniesTest < ApplicationIntegrationTest
+  def setup
+    super
+
+    @contact = contacts(:john)
+    @user = users(:registrant)
+    @auth_headers = { 'HTTP_AUTHORIZATION' => auth_token }
+  end
+
+  def test_root_accepts_limit_and_offset_parameters
+    contacts(:william).update!(ident: '1234', ident_type: 'priv', ident_country_code: 'US')
+    assert_equal 4, @user.contacts(representable: false).size
+
+    get '/api/v1/registrant/companies', params: { 'limit' => 1, 'offset' => 0 },
+        headers: @auth_headers
+    response_json = JSON.parse(response.body, symbolize_names: true)
+    assert_equal(200, response.status)
+    assert_equal(1, response_json.count)
+
+    get '/api/v1/registrant/companies', headers: @auth_headers
+    response_json = JSON.parse(response.body, symbolize_names: true)
+    assert_equal(@user.companies.size, response_json.count)
+  end
+
+  private
+
+  def auth_token
+    token_creator = AuthTokenCreator.create_with_defaults(@user)
+    hash = token_creator.token_in_hash
+    "Bearer #{hash[:access_token]}"
+  end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 6e1b10c88..459d4f8f5 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -27,10 +27,10 @@ Rake::Task.clear
 Rails.application.load_tasks
 
 class CompanyRegisterClientStub
-  Company = Struct.new(:registration_number)
+  Company = Struct.new(:registration_number, :company_name)
 
   def representation_rights(citizen_personal_code:, citizen_country_code:)
-    [Company.new('1234567')]
+    [Company.new('1234567', 'ACME Ltd')]
   end
 end