diff --git a/atom/browser/atom_browser_context.cc b/atom/browser/atom_browser_context.cc
index 63c8c81fb4df..e076fe85c176 100644
--- a/atom/browser/atom_browser_context.cc
+++ b/atom/browser/atom_browser_context.cc
@@ -12,6 +12,7 @@
 #include "atom/browser/browser.h"
 #include "atom/browser/net/asar/asar_protocol_handler.h"
 #include "atom/browser/net/atom_cert_verifier.h"
+#include "atom/browser/net/atom_ct_delegate.h"
 #include "atom/browser/net/atom_network_delegate.h"
 #include "atom/browser/net/atom_ssl_config_service.h"
 #include "atom/browser/net/atom_url_request_job_factory.h"
@@ -67,10 +68,11 @@ std::string RemoveWhitespace(const std::string& str) {
 
 }  // namespace
 
-AtomBrowserContext::AtomBrowserContext(
-    const std::string& partition, bool in_memory,
-    const base::DictionaryValue& options)
+AtomBrowserContext::AtomBrowserContext(const std::string& partition,
+                                       bool in_memory,
+                                       const base::DictionaryValue& options)
     : brightray::BrowserContext(partition, in_memory),
+      ct_delegate_(new AtomCTDelegate),
       network_delegate_(new AtomNetworkDelegate),
       cookie_delegate_(new AtomCookieDelegate) {
   // Construct user agent string.
@@ -190,7 +192,7 @@ content::PermissionManager* AtomBrowserContext::GetPermissionManager() {
 }
 
 std::unique_ptr<net::CertVerifier> AtomBrowserContext::CreateCertVerifier() {
-  return base::WrapUnique(new AtomCertVerifier);
+  return base::WrapUnique(new AtomCertVerifier(ct_delegate_.get()));
 }
 
 net::SSLConfigService* AtomBrowserContext::CreateSSLConfigService() {
@@ -205,6 +207,11 @@ std::vector<std::string> AtomBrowserContext::GetCookieableSchemes() {
   return default_schemes;
 }
 
+net::TransportSecurityState::RequireCTDelegate*
+AtomBrowserContext::GetRequireCTDelegate() {
+  return ct_delegate_.get();
+}
+
 void AtomBrowserContext::RegisterPrefs(PrefRegistrySimple* pref_registry) {
   pref_registry->RegisterFilePathPref(prefs::kSelectFileLastDirectory,
                                       base::FilePath());
diff --git a/atom/browser/atom_browser_context.h b/atom/browser/atom_browser_context.h
index 0ff1cc6321ad..f149e62cb279 100644
--- a/atom/browser/atom_browser_context.h
+++ b/atom/browser/atom_browser_context.h
@@ -15,6 +15,7 @@
 namespace atom {
 
 class AtomBlobReader;
+class AtomCTDelegate;
 class AtomDownloadManagerDelegate;
 class AtomNetworkDelegate;
 class AtomPermissionManager;
@@ -42,6 +43,8 @@ class AtomBrowserContext : public brightray::BrowserContext {
   std::unique_ptr<net::CertVerifier> CreateCertVerifier() override;
   net::SSLConfigService* CreateSSLConfigService() override;
   std::vector<std::string> GetCookieableSchemes() override;
+  net::TransportSecurityState::RequireCTDelegate* GetRequireCTDelegate()
+      override;
 
   // content::BrowserContext:
   content::DownloadManagerDelegate* GetDownloadManagerDelegate() override;
@@ -67,6 +70,7 @@ class AtomBrowserContext : public brightray::BrowserContext {
   std::unique_ptr<WebViewManager> guest_manager_;
   std::unique_ptr<AtomPermissionManager> permission_manager_;
   std::unique_ptr<AtomBlobReader> blob_reader_;
+  std::unique_ptr<AtomCTDelegate> ct_delegate_;
   std::string user_agent_;
   bool use_cache_;
 
diff --git a/atom/browser/net/atom_cert_verifier.cc b/atom/browser/net/atom_cert_verifier.cc
index 7fb2ce72297c..9892845cc83f 100644
--- a/atom/browser/net/atom_cert_verifier.cc
+++ b/atom/browser/net/atom_cert_verifier.cc
@@ -5,9 +5,11 @@
 #include "atom/browser/net/atom_cert_verifier.h"
 
 #include "atom/browser/browser.h"
+#include "atom/browser/net/atom_ct_delegate.h"
 #include "atom/common/native_mate_converters/net_converter.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/base/net_errors.h"
+#include "net/cert/cert_verify_result.h"
 #include "net/cert/crl_set.h"
 #include "net/cert/x509_certificate.h"
 
@@ -28,12 +30,11 @@ void OnResult(
 
 }  // namespace
 
-AtomCertVerifier::AtomCertVerifier()
-    : default_cert_verifier_(net::CertVerifier::CreateDefault()) {
-}
+AtomCertVerifier::AtomCertVerifier(AtomCTDelegate* ct_delegate)
+    : default_cert_verifier_(net::CertVerifier::CreateDefault()),
+      ct_delegate_(ct_delegate) {}
 
-AtomCertVerifier::~AtomCertVerifier() {
-}
+AtomCertVerifier::~AtomCertVerifier() {}
 
 void AtomCertVerifier::SetVerifyProc(const VerifyProc& proc) {
   verify_proc_ = proc;
@@ -48,9 +49,15 @@ int AtomCertVerifier::Verify(
     const net::BoundNetLog& net_log) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
-  if (verify_proc_.is_null())
+  if (verify_proc_.is_null()) {
+    ct_delegate_->ClearCTExcludedHostsList();
     return default_cert_verifier_->Verify(
         params, crl_set, verify_result, callback, out_req, net_log);
+  }
+
+  verify_result->Reset();
+  verify_result->verified_cert = params.certificate();
+  ct_delegate_->AddCTExcludedHost(params.hostname());
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
diff --git a/atom/browser/net/atom_cert_verifier.h b/atom/browser/net/atom_cert_verifier.h
index 74b8f2784c16..7582fae74f61 100644
--- a/atom/browser/net/atom_cert_verifier.h
+++ b/atom/browser/net/atom_cert_verifier.h
@@ -12,9 +12,11 @@
 
 namespace atom {
 
+class AtomCTDelegate;
+
 class AtomCertVerifier : public net::CertVerifier {
  public:
-  AtomCertVerifier();
+  explicit AtomCertVerifier(AtomCTDelegate* ct_delegate);
   virtual ~AtomCertVerifier();
 
   using VerifyProc =
@@ -37,6 +39,7 @@ class AtomCertVerifier : public net::CertVerifier {
  private:
   VerifyProc verify_proc_;
   std::unique_ptr<net::CertVerifier> default_cert_verifier_;
+  AtomCTDelegate* ct_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(AtomCertVerifier);
 };
diff --git a/atom/browser/net/atom_ct_delegate.cc b/atom/browser/net/atom_ct_delegate.cc
new file mode 100644
index 000000000000..66d6c93adb35
--- /dev/null
+++ b/atom/browser/net/atom_ct_delegate.cc
@@ -0,0 +1,34 @@
+// Copyright (c) 2016 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/net/atom_ct_delegate.h"
+
+#include "content/public/browser/browser_thread.h"
+
+namespace atom {
+
+AtomCTDelegate::AtomCTDelegate() {}
+
+AtomCTDelegate::~AtomCTDelegate() {}
+
+void AtomCTDelegate::AddCTExcludedHost(const std::string& host) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  ct_excluded_hosts_.insert(host);
+}
+
+void AtomCTDelegate::ClearCTExcludedHostsList() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  ct_excluded_hosts_.clear();
+}
+
+AtomCTDelegate::CTRequirementLevel AtomCTDelegate::IsCTRequiredForHost(
+    const std::string& host) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  if (!ct_excluded_hosts_.empty() &&
+      (ct_excluded_hosts_.find(host) != ct_excluded_hosts_.end()))
+    return CTRequirementLevel::NOT_REQUIRED;
+  return CTRequirementLevel::DEFAULT;
+}
+
+}  // namespace atom
diff --git a/atom/browser/net/atom_ct_delegate.h b/atom/browser/net/atom_ct_delegate.h
new file mode 100644
index 000000000000..680071eaa06c
--- /dev/null
+++ b/atom/browser/net/atom_ct_delegate.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2016 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_NET_ATOM_CT_DELEGATE_H_
+#define ATOM_BROWSER_NET_ATOM_CT_DELEGATE_H_
+
+#include <set>
+#include <string>
+
+#include "net/http/transport_security_state.h"
+
+namespace atom {
+
+class AtomCTDelegate : public net::TransportSecurityState::RequireCTDelegate {
+ public:
+  AtomCTDelegate();
+  ~AtomCTDelegate() override;
+
+  void AddCTExcludedHost(const std::string& host);
+  void ClearCTExcludedHostsList();
+
+  // net::TransportSecurityState::RequireCTDelegate:
+  CTRequirementLevel IsCTRequiredForHost(const std::string& host) override;
+
+ private:
+  std::set<std::string> ct_excluded_hosts_;
+  DISALLOW_COPY_AND_ASSIGN(AtomCTDelegate);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_NET_ATOM_CT_DELEGATE_H_
diff --git a/filenames.gypi b/filenames.gypi
index 9c4b42f622d5..f1ee8d069c34 100644
--- a/filenames.gypi
+++ b/filenames.gypi
@@ -227,6 +227,8 @@
       'atom/browser/net/asar/url_request_asar_job.h',
       'atom/browser/net/atom_cert_verifier.cc',
       'atom/browser/net/atom_cert_verifier.h',
+      'atom/browser/net/atom_ct_delegate.cc',
+      'atom/browser/net/atom_ct_delegate.h',
       'atom/browser/net/atom_cookie_delegate.cc',
       'atom/browser/net/atom_cookie_delegate.h',
       'atom/browser/net/atom_network_delegate.cc',