diff --git a/Common.ruleset b/Common.ruleset
index b53ccc1aa3..e36f992415 100644
--- a/Common.ruleset
+++ b/Common.ruleset
@@ -62,9 +62,6 @@
 		<!-- Do not declare visible instance fields -->
 		<Rule Id="CA1051" Action="Hidden" />
 
-		<!-- Static holder types should be Static or NotInheritable -->
-		<Rule Id="CA1052" Action="Hidden" />
-
 		<!-- Uri parameters should not be strings -->
 		<Rule Id="CA1054" Action="Hidden" />
 
diff --git a/src/BizHawk.Bizware.BizwareGL/TexAtlas.cs b/src/BizHawk.Bizware.BizwareGL/TexAtlas.cs
index e777ae795f..f7416038a6 100644
--- a/src/BizHawk.Bizware.BizwareGL/TexAtlas.cs
+++ b/src/BizHawk.Bizware.BizwareGL/TexAtlas.cs
@@ -5,7 +5,7 @@ using System.Drawing;
 
 namespace BizHawk.Bizware.BizwareGL
 {
-	public class TexAtlas
+	public static class TexAtlas
 	{
 		public class RectItem
 		{
diff --git a/src/BizHawk.Client.Common/OpenAdvanced.cs b/src/BizHawk.Client.Common/OpenAdvanced.cs
index e062c60604..c13933d424 100644
--- a/src/BizHawk.Client.Common/OpenAdvanced.cs
+++ b/src/BizHawk.Client.Common/OpenAdvanced.cs
@@ -35,7 +35,7 @@ namespace BizHawk.Client.Common
 	}
 
 
-	public class OpenAdvancedSerializer
+	public static class OpenAdvancedSerializer
 	{
 		public static IOpenAdvanced ParseWithLegacy(string text)
 		{
diff --git a/src/BizHawk.Client.Common/QuickBmpFile.cs b/src/BizHawk.Client.Common/QuickBmpFile.cs
index 6efa5fb258..a5fee187c4 100644
--- a/src/BizHawk.Client.Common/QuickBmpFile.cs
+++ b/src/BizHawk.Client.Common/QuickBmpFile.cs
@@ -11,7 +11,7 @@ using BizHawk.Emulation.Common;
 // ReSharper disable StyleCop.SA1401
 namespace BizHawk.Client.Common
 {
-	public class QuickBmpFile
+	public static class QuickBmpFile
 	{
 		[StructLayout(LayoutKind.Sequential, Pack = 1)]
 		private class BITMAPFILEHEADER
diff --git a/src/BizHawk.Client.Common/lua/EnvironmentSandbox.cs b/src/BizHawk.Client.Common/lua/EnvironmentSandbox.cs
index 3042a821c9..3f201935e9 100644
--- a/src/BizHawk.Client.Common/lua/EnvironmentSandbox.cs
+++ b/src/BizHawk.Client.Common/lua/EnvironmentSandbox.cs
@@ -3,7 +3,7 @@
 // TODO - kill this file (or renew the concept as distinct from the LuaSandbox?)
 namespace BizHawk.Client.Common
 {
-	public class EnvironmentSandbox
+	public static class EnvironmentSandbox
 	{
 		public static void Sandbox(Action callback)
 		{
diff --git a/src/BizHawk.Client.DiscoHawk/AudioExtractor.cs b/src/BizHawk.Client.DiscoHawk/AudioExtractor.cs
index 93f782dddf..2184bbb5f8 100644
--- a/src/BizHawk.Client.DiscoHawk/AudioExtractor.cs
+++ b/src/BizHawk.Client.DiscoHawk/AudioExtractor.cs
@@ -4,7 +4,7 @@ using BizHawk.Emulation.DiscSystem;
 
 namespace BizHawk.Client.DiscoHawk
 {
-	public class AudioExtractor
+	public static class AudioExtractor
 	{
 		public static string FFmpegPath;
 
diff --git a/src/BizHawk.Client.EmuHawk/Communication.cs b/src/BizHawk.Client.EmuHawk/Communication.cs
index 4125a6389c..cc9473ef32 100644
--- a/src/BizHawk.Client.EmuHawk/Communication.cs
+++ b/src/BizHawk.Client.EmuHawk/Communication.cs
@@ -12,7 +12,7 @@ using BizHawk.Emulation.Common;
 
 namespace BizHawk.Client.EmuHawk
 {
-	public class Communication
+	public static class Communication
 	{
 		public class HttpCommunication
 		{
diff --git a/src/BizHawk.Client.EmuHawk/JumpLists.cs b/src/BizHawk.Client.EmuHawk/JumpLists.cs
index 0b3710c01d..8d628c9014 100644
--- a/src/BizHawk.Client.EmuHawk/JumpLists.cs
+++ b/src/BizHawk.Client.EmuHawk/JumpLists.cs
@@ -4,7 +4,7 @@ using System.Reflection;
 
 namespace BizHawk.Client.EmuHawk
 {
-	public class JumpLists
+	public static class JumpLists
 	{
 		private static readonly Type JumpList;
 		private static readonly Type JumpTask;
diff --git a/src/BizHawk.Common/BinaryQuickSerializer.cs b/src/BizHawk.Common/BinaryQuickSerializer.cs
index a7a88591a5..a4917cd737 100644
--- a/src/BizHawk.Common/BinaryQuickSerializer.cs
+++ b/src/BizHawk.Common/BinaryQuickSerializer.cs
@@ -14,7 +14,7 @@ namespace BizHawk.Common
 {
 	// fields are serialized/deserialized in their memory order as reported by Marshal.OffsetOf
 	// to do anything useful, passed targets should be [StructLayout.Sequential] or [StructLayout.Explicit]
-	public class BinaryQuickSerializer
+	public static class BinaryQuickSerializer
 	{
 		private static MethodInfo FromExpression(Expression e)
 		{
diff --git a/src/BizHawk.Common/DeepEquality.cs b/src/BizHawk.Common/DeepEquality.cs
index e02961c0e5..c1719a3b8b 100644
--- a/src/BizHawk.Common/DeepEquality.cs
+++ b/src/BizHawk.Common/DeepEquality.cs
@@ -13,7 +13,7 @@ namespace BizHawk.Common
 	{
 	}
 
-	public class DeepEquality
+	public static class DeepEquality
 	{
 		/// <summary>
 		/// return true if an array type is not 0-based
diff --git a/src/BizHawk.Common/SettingsUtil.cs b/src/BizHawk.Common/SettingsUtil.cs
index a795d3ab57..bf6a979fe0 100644
--- a/src/BizHawk.Common/SettingsUtil.cs
+++ b/src/BizHawk.Common/SettingsUtil.cs
@@ -9,7 +9,7 @@ using System.ComponentModel;
 
 namespace BizHawk.Common
 {
-	public class SettingsUtil
+	public static class SettingsUtil
 	{
 		private sealed class DefaultValueSetter
 		{
diff --git a/src/BizHawk.Emulation.Cores/CPUs/ARM/Darm.cs b/src/BizHawk.Emulation.Cores/CPUs/ARM/Darm.cs
index d1d4e1da45..2c9b870bd3 100644
--- a/src/BizHawk.Emulation.Cores/CPUs/ARM/Darm.cs
+++ b/src/BizHawk.Emulation.Cores/CPUs/ARM/Darm.cs
@@ -4,7 +4,7 @@ using System.Runtime.InteropServices;
 
 namespace BizHawk.Emulation.Cores.Components.ARM
 {
-	public class Darm
+	public static class Darm
 	{
 		public const string dllname = "libdarm.dll";
 		public const CallingConvention cc = CallingConvention.Cdecl;
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/GBColors.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/GBColors.cs
index 78a53a16c1..be7fcde259 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/GBColors.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/GBColors.cs
@@ -2,7 +2,7 @@
 
 namespace BizHawk.Emulation.Cores.Nintendo.Gameboy
 {
-	public class GBColors
+	public static class GBColors
 	{
 		/*
 		 * The GBC uses a RGB555 color space, but it most definately does not resemble sRGB at all.
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/Nes_NTSC_Colors.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/Nes_NTSC_Colors.cs
index 0c041c3280..2e9c09d2c9 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/Nes_NTSC_Colors.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/Nes_NTSC_Colors.cs
@@ -2,7 +2,7 @@
 
 namespace BizHawk.Emulation.Cores.Consoles.Nintendo.QuickNES
 {
-	public class Nes_NTSC_Colors
+	public static class Nes_NTSC_Colors
 	{
 		// just the color deemphasis routines from nes_ntsc