diff --git a/app/extensions.js b/app/extensions.js
index 5a212af9bd3..d7e7d7aa203 100644
--- a/app/extensions.js
+++ b/app/extensions.js
@@ -42,6 +42,14 @@ let generateBraveManifest = () => {
       persistent: true
     },
     content_scripts: [
+      {
+        run_at: 'document_start',
+        all_frames: true,
+        matches: ['https://www.marketwatch.com/*'],
+        css: [
+          'content/styles/siteHack-marketwatch.com.css'
+        ]
+      },
       {
         run_at: 'document_start',
         all_frames: true,
diff --git a/app/extensions/brave/content/styles/siteHack-marketwatch.com.css b/app/extensions/brave/content/styles/siteHack-marketwatch.com.css
new file mode 100644
index 00000000000..03de69bfbe0
--- /dev/null
+++ b/app/extensions/brave/content/styles/siteHack-marketwatch.com.css
@@ -0,0 +1,7 @@
+.element--ad,
+.container--bannerAd,
+#brass-rail,
+.ad.module,
+iframe[src*="smartads.epl"] {
+    display: none !important;
+}
\ No newline at end of file