diff --git a/src/OpenTelemetry.Exporter.Geneva/MsgPackExporter/MsgPackLogExporter.cs b/src/OpenTelemetry.Exporter.Geneva/MsgPackExporter/MsgPackLogExporter.cs
index cb09ae3862..be37e18b1e 100644
--- a/src/OpenTelemetry.Exporter.Geneva/MsgPackExporter/MsgPackLogExporter.cs
+++ b/src/OpenTelemetry.Exporter.Geneva/MsgPackExporter/MsgPackLogExporter.cs
@@ -504,7 +504,7 @@ public void Dispose()
         }
     };
 
-    private class SerializationDataForScopes
+    private sealed class SerializationDataForScopes
     {
         public bool HasEnvProperties;
         public ushort EnvPropertiesCount;
diff --git a/src/OpenTelemetry.Exporter.Geneva/TLDExporter/TldLogExporter.cs b/src/OpenTelemetry.Exporter.Geneva/TLDExporter/TldLogExporter.cs
index 2842458d55..19fda3648d 100644
--- a/src/OpenTelemetry.Exporter.Geneva/TLDExporter/TldLogExporter.cs
+++ b/src/OpenTelemetry.Exporter.Geneva/TLDExporter/TldLogExporter.cs
@@ -530,7 +530,7 @@ private static string GetSanitizedCategoryName(string categoryName)
         }
     };
 
-    private class SerializationDataForScopes
+    private sealed class SerializationDataForScopes
     {
         public byte HasEnvProperties;
         public byte PartCFieldsCountFromState;
diff --git a/src/OpenTelemetry.Instrumentation.AspNet.TelemetryHttpModule/ActivityHelper.cs b/src/OpenTelemetry.Instrumentation.AspNet.TelemetryHttpModule/ActivityHelper.cs
index 5c510f7c44..7ef463ec8d 100644
--- a/src/OpenTelemetry.Instrumentation.AspNet.TelemetryHttpModule/ActivityHelper.cs
+++ b/src/OpenTelemetry.Instrumentation.AspNet.TelemetryHttpModule/ActivityHelper.cs
@@ -215,7 +215,7 @@ internal static void RestoreContextIfNeeded(HttpContext context)
         }
     }
 
-    internal class ContextHolder
+    internal sealed class ContextHolder
     {
         public Activity Activity;
         public object Baggage;
diff --git a/src/OpenTelemetry.Instrumentation.AspNet/AspNetMetrics.cs b/src/OpenTelemetry.Instrumentation.AspNet/AspNetMetrics.cs
index 53fa1720da..60d9f51a02 100644
--- a/src/OpenTelemetry.Instrumentation.AspNet/AspNetMetrics.cs
+++ b/src/OpenTelemetry.Instrumentation.AspNet/AspNetMetrics.cs
@@ -24,7 +24,7 @@ namespace OpenTelemetry.Instrumentation.AspNet;
 /// <summary>
 /// Asp.Net Requests instrumentation.
 /// </summary>
-internal class AspNetMetrics : IDisposable
+internal sealed class AspNetMetrics : IDisposable
 {
     internal static readonly AssemblyName AssemblyName = typeof(HttpInMetricsListener).Assembly.GetName();
     internal static readonly string InstrumentationName = AssemblyName.Name;
diff --git a/src/OpenTelemetry.Instrumentation.Process/ProcessInstrumentationOptions.cs b/src/OpenTelemetry.Instrumentation.Process/ProcessInstrumentationOptions.cs
index f5d5fd1a7a..2f168f0e07 100644
--- a/src/OpenTelemetry.Instrumentation.Process/ProcessInstrumentationOptions.cs
+++ b/src/OpenTelemetry.Instrumentation.Process/ProcessInstrumentationOptions.cs
@@ -19,6 +19,6 @@ namespace OpenTelemetry.Instrumentation.Process;
 /// <summary>
 /// Options to define the process metrics.
 /// </summary>
-internal class ProcessInstrumentationOptions
+internal sealed class ProcessInstrumentationOptions
 {
 }
diff --git a/src/OpenTelemetry.Instrumentation.Runtime/RuntimeMetrics.cs b/src/OpenTelemetry.Instrumentation.Runtime/RuntimeMetrics.cs
index 68ac758b88..eb730de55b 100644
--- a/src/OpenTelemetry.Instrumentation.Runtime/RuntimeMetrics.cs
+++ b/src/OpenTelemetry.Instrumentation.Runtime/RuntimeMetrics.cs
@@ -28,7 +28,7 @@ namespace OpenTelemetry.Instrumentation.Runtime;
 /// <summary>
 /// .NET runtime instrumentation.
 /// </summary>
-internal class RuntimeMetrics
+internal sealed class RuntimeMetrics
 {
     internal static readonly AssemblyName AssemblyName = typeof(RuntimeMetrics).Assembly.GetName();
     internal static readonly Meter MeterInstance = new(AssemblyName.Name!, AssemblyName.Version?.ToString());
diff --git a/src/OpenTelemetry.PersistentStorage.FileSystem/DirectorySizeTracker.cs b/src/OpenTelemetry.PersistentStorage.FileSystem/DirectorySizeTracker.cs
index 7d942ec7e9..034b108bb1 100644
--- a/src/OpenTelemetry.PersistentStorage.FileSystem/DirectorySizeTracker.cs
+++ b/src/OpenTelemetry.PersistentStorage.FileSystem/DirectorySizeTracker.cs
@@ -23,7 +23,7 @@ namespace OpenTelemetry.PersistentStorage.FileSystem;
 /// <summary>
 /// Tracks the available storage in a specified directory.
 /// </summary>
-internal class DirectorySizeTracker
+internal sealed class DirectorySizeTracker
 {
     private readonly long maxSizeInBytes;
     private readonly string path;