diff --git a/src/CompaniesHouse/Response/FilingSubcategory.cs b/src/CompaniesHouse/Response/FilingSubcategory.cs
index 30e830e..888c469 100644
--- a/src/CompaniesHouse/Response/FilingSubcategory.cs
+++ b/src/CompaniesHouse/Response/FilingSubcategory.cs
@@ -92,5 +92,8 @@ public enum FilingSubcategory
 
         [EnumMember(Value = "social-landlord")]
         SocialLandlord,
+
+        [EnumMember(Value = "investment-company")]
+        InvestmentCompany,
     }
 }
diff --git a/tests/CompaniesHouse.Tests/EnumerationMappings.cs b/tests/CompaniesHouse.Tests/EnumerationMappings.cs
index da74e62..1b9c0a5 100644
--- a/tests/CompaniesHouse.Tests/EnumerationMappings.cs
+++ b/tests/CompaniesHouse.Tests/EnumerationMappings.cs
@@ -181,6 +181,7 @@ public static class EnumerationMappings
                 {"mortgage", FilingSubcategory.Mortgage},
                 {"transfer", FilingSubcategory.Transfer},
                 {"debenture", FilingSubcategory.Debenture},
+                {"investment-company", FilingSubcategory.InvestmentCompany},
             };
 
         public static readonly IReadOnlyDictionary<string, FilingCategory> PossibleFilingCategories = new Dictionary