diff --git a/package.json b/package.json
index c78e9104..21a7b352 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,6 @@
     "moment": "^2.24.0",
     "pluralise": "^1.0.1",
     "prop-types": "^15.7.2",
-    "query-string": "^6.8.2",
     "react-lines-ellipsis": "^0.14.1",
     "react-markdown": "^4.0.8",
     "styled-components": "^4.2.0"
diff --git a/src/entity-search/EntitySearch.stories.jsx b/src/entity-search/EntitySearch.stories.jsx
index 0f80ff78..458aaccb 100644
--- a/src/entity-search/EntitySearch.stories.jsx
+++ b/src/entity-search/EntitySearch.stories.jsx
@@ -13,16 +13,35 @@ import EntitySearchWithDataProvider from './EntitySearchWithDataProvider'
 
 const mock = new MockAdapter(axios)
 const apiEndpoint = 'http://localhost:3010/v4/dnb/company-search'
-const apiEndpointWithParameters = new RegExp(`${apiEndpoint}.+`)
 
-const setupSuccessMocks = (response = fixtures.companySearch) => {
-  mock.onPost(apiEndpoint).reply(200, response)
-  mock.onPost(apiEndpointWithParameters).reply(200, response)
+const setupSuccessMocks = () => {
+  mock
+    .onPost(apiEndpoint, {})
+    .reply(200, fixtures.companySearch)
+  mock
+    .onPost(apiEndpoint, { search_term: 'some other company' })
+    .reply(200, fixtures.companySearchFilteredByCompanyName)
+  mock
+    .onPost(apiEndpoint, { address_postcode: 'BN1 4SE' })
+    .reply(200, fixtures.companySearchFilteredByPostcode)
 }
 
 const setupErrorMocks = () => {
-  mock.onPost(apiEndpoint).reply(500)
-  mock.onPost(apiEndpointWithParameters).reply(500)
+  mock.onPost(apiEndpoint, {}).reply(500)
+  mock.onPost(apiEndpoint, { search_term: 'some other company' }).reply(500)
+  mock.onPost(apiEndpoint, { address_postcode: 'BN1 4SE' }).reply(500)
+}
+
+const setupNoResultsMocks = () => {
+  mock
+    .onPost(apiEndpoint, {})
+    .reply(200, fixtures.companySearchNoResults)
+  mock
+    .onPost(apiEndpoint, { search_term: 'some other company' })
+    .reply(200, fixtures.companySearchNoResults)
+  mock
+    .onPost(apiEndpoint, { address_postcode: 'BN1 4SE' })
+    .reply(200, fixtures.companySearchNoResults)
 }
 
 const EntitySearchForStorybook = ({ previouslySelected, cannotFindLink }) => {
@@ -130,7 +149,7 @@ storiesOf('EntitySearch', module)
     )
   })
   .add('Data Hub company search with no results', () => {
-    setupSuccessMocks(fixtures.companySearchNoResults)
+    setupNoResultsMocks()
 
     return (
       <EntitySearchForStorybook />
diff --git a/src/entity-search/EntitySearch.test.jsx b/src/entity-search/EntitySearch.test.jsx
index b5a78168..dfe46a2a 100644
--- a/src/entity-search/EntitySearch.test.jsx
+++ b/src/entity-search/EntitySearch.test.jsx
@@ -11,13 +11,13 @@ import EntitySearchWithDataProvider from './EntitySearchWithDataProvider'
 const mock = new MockAdapter(axios)
 const API_ENDPOINT = 'http://localhost:8000/v4/dnb/company-search'
 mock
-  .onPost(API_ENDPOINT)
+  .onPost(API_ENDPOINT, {})
   .reply(200, fixtures.companySearch)
 mock
-  .onPost(`${API_ENDPOINT}?search_term=some%20other%20company`)
+  .onPost(API_ENDPOINT, { search_term: 'some other company' })
   .reply(200, fixtures.companySearchFilteredByCompanyName)
 mock
-  .onPost(`${API_ENDPOINT}?address_postcode=BN1%204SE`)
+  .onPost(API_ENDPOINT, { address_postcode: 'BN1 4SE' })
   .reply(200, fixtures.companySearchFilteredByPostcode)
 
 const flushPromises = () => {
@@ -263,7 +263,7 @@ describe('EntitySearch', () => {
 
   describe('when the API returns a server error', () => {
     beforeAll(() => {
-      mock.onPost(API_ENDPOINT).reply(500)
+      mock.onPost(API_ENDPOINT, {}).reply(500)
     })
 
     test('should render the component with an error message', async () => {
@@ -281,7 +281,7 @@ describe('EntitySearch', () => {
 
   describe('when the API returns 0 results', () => {
     beforeAll(() => {
-      mock.onPost(API_ENDPOINT).reply(200, fixtures.companySearchNoResults)
+      mock.onPost(API_ENDPOINT, {}).reply(200, fixtures.companySearchNoResults)
     })
 
     test('should render the component with a "no entities" message', async () => {
diff --git a/src/entity-search/data-providers/DnbCompanySearch.jsx b/src/entity-search/data-providers/DnbCompanySearch.jsx
index de2076a4..52887c12 100644
--- a/src/entity-search/data-providers/DnbCompanySearch.jsx
+++ b/src/entity-search/data-providers/DnbCompanySearch.jsx
@@ -2,12 +2,10 @@
 import React from 'react'
 import axios from 'axios'
 import { compact, join } from 'lodash'
-import queryString from 'query-string'
 
 export default (apiEndpoint) => {
   return async (filters) => {
-    const transformed = queryString.stringify(filters)
-    const { data } = await axios.post(`${apiEndpoint + (transformed ? `?${transformed}` : '')}`)
+    const { data } = await axios.post(apiEndpoint, filters)
 
     return data.results.map((result) => {
       const { dnb_company, datahub_company } = result
diff --git a/yarn.lock b/yarn.lock
index 4503f86f..4fe33f19 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10574,15 +10574,6 @@ query-string@^6.2.0:
     split-on-first "^1.0.0"
     strict-uri-encode "^2.0.0"
 
-query-string@^6.8.2:
-  version "6.8.2"
-  resolved "https://registry.yarnpkg.com/query-string/-/query-string-6.8.2.tgz#36cb7e452ae11a4b5e9efee83375e0954407b2f6"
-  integrity sha512-J3Qi8XZJXh93t2FiKyd/7Ec6GNifsjKXUsVFkSBj/kjLsDylWhnCz4NT1bkPcKotttPW+QbKGqqPH8OoI2pdqw==
-  dependencies:
-    decode-uri-component "^0.2.0"
-    split-on-first "^1.0.0"
-    strict-uri-encode "^2.0.0"
-
 querystring-es3@^0.2.0:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/querystring-es3/-/querystring-es3-0.2.1.tgz#9ec61f79049875707d69414596fd907a4d711e73"