diff --git a/docs/release-notes/.FSharp.Compiler.Service/9.0.300.md b/docs/release-notes/.FSharp.Compiler.Service/9.0.300.md
index 491273fa561..d406d513e96 100644
--- a/docs/release-notes/.FSharp.Compiler.Service/9.0.300.md
+++ b/docs/release-notes/.FSharp.Compiler.Service/9.0.300.md
@@ -13,6 +13,7 @@
 * Fix NRE when accessing nullable fields of types within their equals/hash/compare methods ([PR #18296](https://github.com/dotnet/fsharp/pull/18296))
 * Fix nullness warning for overrides of generic code with nullable type instance ([Issue #17988](https://github.com/dotnet/fsharp/issues/17988), [PR #18337](https://github.com/dotnet/fsharp/pull/18337))
 * Unsafe downcast from `obj` to generic `T` no longer requires `not null` constraint on `T`([Issue #18275](https://github.com/dotnet/fsharp/issues/18275), [PR #18343](https://github.com/dotnet/fsharp/pull/18343))
+* Fix for missing parse diagnostics in TransparentCompiler.ParseAndCheckProject ([PR #18366](https://github.com/dotnet/fsharp/pull/18366))
 
 ### Added
 * Added missing type constraints in FCS. ([PR #18241](https://github.com/dotnet/fsharp/pull/18241))
diff --git a/src/Compiler/Service/TransparentCompiler.fs b/src/Compiler/Service/TransparentCompiler.fs
index 9007a111e7d..3b411028328 100644
--- a/src/Compiler/Service/TransparentCompiler.fs
+++ b/src/Compiler/Service/TransparentCompiler.fs
@@ -1733,13 +1733,20 @@ type internal TransparentCompiler
 
                 let! projectSnapshot = parseSourceFiles projectSnapshot bootstrapInfo.TcConfig
 
+                let parseDiagnostics =
+                    projectSnapshot.SourceFiles
+                    |> Seq.collect (fun f -> f.ParseDiagnostics)
+                    |> Seq.toArray
+
                 let! graph, dependencyFiles = ComputeDependencyGraphForProject bootstrapInfo.TcConfig projectSnapshot
 
-                return!
+                let! results, tcInfo =
                     processTypeCheckingGraph
                         graph
                         (processGraphNode projectSnapshot bootstrapInfo dependencyFiles true)
                         bootstrapInfo.InitialTcInfo
+
+                return results, tcInfo, parseDiagnostics
             }
         )
 
@@ -1771,7 +1778,7 @@ type internal TransparentCompiler
             projectSnapshot.SignatureKey,
             async {
 
-                let! results, finalInfo = ComputeParseAndCheckAllFilesInProject bootstrapInfo projectSnapshot
+                let! results, finalInfo, parseDiagnostics = ComputeParseAndCheckAllFilesInProject bootstrapInfo projectSnapshot
 
                 let assemblyName = bootstrapInfo.AssemblyName
                 let tcConfig = bootstrapInfo.TcConfig
@@ -1855,7 +1862,7 @@ type internal TransparentCompiler
                         errorRecoveryNoRange exn
                         ProjectAssemblyDataResult.Unavailable true
 
-                return finalInfo, ilAssemRef, assemblyDataResult, checkedImplFiles
+                return finalInfo, ilAssemRef, assemblyDataResult, checkedImplFiles, parseDiagnostics
             }
         )
 
@@ -1897,7 +1904,7 @@ type internal TransparentCompiler
 
                             let! snapshotWithSources = LoadSources bootstrapInfo projectSnapshot
 
-                            let! _, _, assemblyDataResult, _ = ComputeProjectExtras bootstrapInfo snapshotWithSources
+                            let! _, _, assemblyDataResult, _, _ = ComputeProjectExtras bootstrapInfo snapshotWithSources
                             Trace.TraceInformation($"Using in-memory project reference: {name}")
 
                             return assemblyDataResult
@@ -1919,7 +1926,8 @@ type internal TransparentCompiler
                 | Some bootstrapInfo, creationDiags ->
                     let! snapshotWithSources = LoadSources bootstrapInfo projectSnapshot
 
-                    let! tcInfo, ilAssemRef, assemblyDataResult, checkedImplFiles = ComputeProjectExtras bootstrapInfo snapshotWithSources
+                    let! tcInfo, ilAssemRef, assemblyDataResult, checkedImplFiles, parseDiagnostics =
+                        ComputeProjectExtras bootstrapInfo snapshotWithSources
 
                     let diagnosticsOptions = bootstrapInfo.TcConfig.diagnosticsOptions
                     let fileName = DummyFileNameForRangesWithoutASpecificLocation
@@ -1934,18 +1942,18 @@ type internal TransparentCompiler
                         SymbolEnv(bootstrapInfo.TcGlobals, tcInfo.tcState.Ccu, Some tcInfo.tcState.CcuSig, bootstrapInfo.TcImports)
                         |> Some
 
-                    let tcDiagnostics =
+                    let diagnostics =
                         DiagnosticHelpers.CreateDiagnostics(
                             diagnosticsOptions,
                             true,
                             fileName,
-                            tcDiagnostics,
+                            Array.concat [| parseDiagnostics; tcDiagnostics |],
                             suggestNamesForErrors,
                             bootstrapInfo.TcConfig.flatErrors,
                             symbolEnv
                         )
 
-                    let diagnostics = [| yield! creationDiags; yield! tcDiagnostics |]
+                    let diagnostics = [| yield! creationDiags; yield! diagnostics |]
 
                     let getAssemblyData () =
                         match assemblyDataResult with
diff --git a/tests/FSharp.Compiler.Service.Tests/ExprTests.fs b/tests/FSharp.Compiler.Service.Tests/ExprTests.fs
index 7a594db1e38..465aac7c4d5 100644
--- a/tests/FSharp.Compiler.Service.Tests/ExprTests.fs
+++ b/tests/FSharp.Compiler.Service.Tests/ExprTests.fs
@@ -3525,3 +3525,20 @@ let ``Test NoWarn HashDirective`` () =
         printfn "ProjectForNoWarnHashDirective error: <<<%s>>>" e.Message
 
     wholeProjectResults.Diagnostics.Length |> shouldEqual 0
+
+module internal SourceForTrcParseErrors =
+
+    let fileSource1 = """
+module N.M
+#nowarn 0xy
+()
+"""
+    
+[<Fact>]
+let ``TrcParseErrors`` () =
+    let options = createProjectOptions [SourceForTrcParseErrors.fileSource1] []
+    let exprChecker = FSharpChecker.Create(keepAssemblyContents=true, useTransparentCompiler=CompilerAssertHelpers.UseTransparentCompiler)
+    let wholeProjectResults = exprChecker.ParseAndCheckProject(options) |> Async.RunImmediate
+    wholeProjectResults.Diagnostics.Length |> shouldEqual 1
+    wholeProjectResults.Diagnostics.[0].ErrorNumber |> shouldEqual 1156
+    wholeProjectResults.Diagnostics.[0].Range.StartLine |> shouldEqual 3
diff --git a/tests/ILVerify/ilverify_FSharp.Compiler.Service_Debug_net9.0.bsl b/tests/ILVerify/ilverify_FSharp.Compiler.Service_Debug_net9.0.bsl
index 4f429d04961..ad200989d8c 100644
--- a/tests/ILVerify/ilverify_FSharp.Compiler.Service_Debug_net9.0.bsl
+++ b/tests/ILVerify/ilverify_FSharp.Compiler.Service_Debug_net9.0.bsl
@@ -21,7 +21,7 @@
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.CodeAnalysis.Hosted.CompilerHelpers::fscCompile([FSharp.Compiler.Service]FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, string, string[])][offset 0x00000082][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.CodeAnalysis.Hosted.CompilerHelpers::fscCompile([FSharp.Compiler.Service]FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, string, string[])][offset 0x0000008B][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+MagicAssemblyResolution::ResolveAssemblyCore([FSharp.Compiler.Service]Internal.Utilities.Library.CompilationThreadToken, [FSharp.Compiler.Service]FSharp.Compiler.Text.Range, [FSharp.Compiler.Service]FSharp.Compiler.CompilerConfig+TcConfigBuilder, [FSharp.Compiler.Service]FSharp.Compiler.CompilerImports+TcImports, [FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiDynamicCompiler, [FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiConsoleOutput, string)][offset 0x00000015][found Char] Unexpected type on the stack.
-[IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+clo@3516-802::Invoke([S.P.CoreLib]System.Tuple`3<char[],int32,int32>)][offset 0x000001E5][found Char] Unexpected type on the stack.
+[IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+clo@3516-805::Invoke([S.P.CoreLib]System.Tuple`3<char[],int32,int32>)][offset 0x000001E5][found Char] Unexpected type on the stack.
 [IL]: Error [UnmanagedPointer]: : FSharp.Compiler.Interactive.Shell+Utilities+pointerToNativeInt@110::Invoke(object)][offset 0x00000007] Unmanaged pointers are not a verifiable type.
 [IL]: Error [StackUnexpected]: : <StartupCode$FSharp-Compiler-Service>.$FSharpCheckerResults+dataTipOfReferences@2205::Invoke([FSharp.Core]Microsoft.FSharp.Core.Unit)][offset 0x00000084][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : <StartupCode$FSharp-Compiler-Service>.$ServiceLexing+clo@921-509::Invoke([FSharp.Core]Microsoft.FSharp.Core.FSharpFunc`2<System.Tuple`3<FSharp.Compiler.Parser+token,int32,int32>,Microsoft.FSharp.Core.Unit>)][offset 0x00000032][found Char] Unexpected type on the stack.
diff --git a/tests/ILVerify/ilverify_FSharp.Compiler.Service_Debug_netstandard2.0.bsl b/tests/ILVerify/ilverify_FSharp.Compiler.Service_Debug_netstandard2.0.bsl
index 2ec0116a1af..c23aae09751 100644
--- a/tests/ILVerify/ilverify_FSharp.Compiler.Service_Debug_netstandard2.0.bsl
+++ b/tests/ILVerify/ilverify_FSharp.Compiler.Service_Debug_netstandard2.0.bsl
@@ -28,7 +28,7 @@
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.CodeAnalysis.Hosted.CompilerHelpers::fscCompile([FSharp.Compiler.Service]FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, string, string[])][offset 0x0000008B][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+FsiStdinSyphon::GetLine(string, int32)][offset 0x00000039][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+MagicAssemblyResolution::ResolveAssemblyCore([FSharp.Compiler.Service]Internal.Utilities.Library.CompilationThreadToken, [FSharp.Compiler.Service]FSharp.Compiler.Text.Range, [FSharp.Compiler.Service]FSharp.Compiler.CompilerConfig+TcConfigBuilder, [FSharp.Compiler.Service]FSharp.Compiler.CompilerImports+TcImports, [FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiDynamicCompiler, [FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiConsoleOutput, string)][offset 0x00000015][found Char] Unexpected type on the stack.
-[IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+clo@3516-802::Invoke([S.P.CoreLib]System.Tuple`3<char[],int32,int32>)][offset 0x000001E5][found Char] Unexpected type on the stack.
+[IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+clo@3516-805::Invoke([S.P.CoreLib]System.Tuple`3<char[],int32,int32>)][offset 0x000001E5][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor::CompletionsForPartialLID([FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiDynamicCompilerState, string)][offset 0x0000001B][found Char] Unexpected type on the stack.
 [IL]: Error [UnmanagedPointer]: : FSharp.Compiler.Interactive.Shell+Utilities+pointerToNativeInt@110::Invoke(object)][offset 0x00000007] Unmanaged pointers are not a verifiable type.
 [IL]: Error [StackUnexpected]: : <StartupCode$FSharp-Compiler-Service>.$FSharpCheckerResults+dataTipOfReferences@2205::Invoke([FSharp.Core]Microsoft.FSharp.Core.Unit)][offset 0x00000084][found Char] Unexpected type on the stack.
diff --git a/tests/ILVerify/ilverify_FSharp.Compiler.Service_Release_net9.0.bsl b/tests/ILVerify/ilverify_FSharp.Compiler.Service_Release_net9.0.bsl
index 48210dddd5c..853566a3c47 100644
--- a/tests/ILVerify/ilverify_FSharp.Compiler.Service_Release_net9.0.bsl
+++ b/tests/ILVerify/ilverify_FSharp.Compiler.Service_Release_net9.0.bsl
@@ -21,7 +21,7 @@
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.CodeAnalysis.Hosted.CompilerHelpers::fscCompile([FSharp.Compiler.Service]FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, string, string[])][offset 0x00000082][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.CodeAnalysis.Hosted.CompilerHelpers::fscCompile([FSharp.Compiler.Service]FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, string, string[])][offset 0x0000008B][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+MagicAssemblyResolution::ResolveAssemblyCore([FSharp.Compiler.Service]Internal.Utilities.Library.CompilationThreadToken, [FSharp.Compiler.Service]FSharp.Compiler.Text.Range, [FSharp.Compiler.Service]FSharp.Compiler.CompilerConfig+TcConfigBuilder, [FSharp.Compiler.Service]FSharp.Compiler.CompilerImports+TcImports, [FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiDynamicCompiler, [FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiConsoleOutput, string)][offset 0x00000015][found Char] Unexpected type on the stack.
-[IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+clo@3516-846::Invoke([S.P.CoreLib]System.Tuple`3<char[],int32,int32>)][offset 0x000001C7][found Char] Unexpected type on the stack.
+[IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+clo@3516-849::Invoke([S.P.CoreLib]System.Tuple`3<char[],int32,int32>)][offset 0x000001C7][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : <StartupCode$FSharp-Compiler-Service>.$FSharpCheckerResults+GetReferenceResolutionStructuredToolTipText@2205::Invoke([FSharp.Core]Microsoft.FSharp.Core.Unit)][offset 0x00000076][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : <StartupCode$FSharp-Compiler-Service>.$ServiceLexing+clo@921-530::Invoke([FSharp.Core]Microsoft.FSharp.Core.FSharpFunc`2<System.Tuple`3<FSharp.Compiler.Parser+token,int32,int32>,Microsoft.FSharp.Core.Unit>)][offset 0x00000032][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : <StartupCode$FSharp-Compiler-Service>.$ServiceLexing+clo@921-530::Invoke([FSharp.Core]Microsoft.FSharp.Core.FSharpFunc`2<System.Tuple`3<FSharp.Compiler.Parser+token,int32,int32>,Microsoft.FSharp.Core.Unit>)][offset 0x0000003B][found Char] Unexpected type on the stack.
diff --git a/tests/ILVerify/ilverify_FSharp.Compiler.Service_Release_netstandard2.0.bsl b/tests/ILVerify/ilverify_FSharp.Compiler.Service_Release_netstandard2.0.bsl
index 2df2cf0fbd9..356b98ede2b 100644
--- a/tests/ILVerify/ilverify_FSharp.Compiler.Service_Release_netstandard2.0.bsl
+++ b/tests/ILVerify/ilverify_FSharp.Compiler.Service_Release_netstandard2.0.bsl
@@ -28,7 +28,7 @@
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.CodeAnalysis.Hosted.CompilerHelpers::fscCompile([FSharp.Compiler.Service]FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, string, string[])][offset 0x0000008B][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+FsiStdinSyphon::GetLine(string, int32)][offset 0x00000032][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+MagicAssemblyResolution::ResolveAssemblyCore([FSharp.Compiler.Service]Internal.Utilities.Library.CompilationThreadToken, [FSharp.Compiler.Service]FSharp.Compiler.Text.Range, [FSharp.Compiler.Service]FSharp.Compiler.CompilerConfig+TcConfigBuilder, [FSharp.Compiler.Service]FSharp.Compiler.CompilerImports+TcImports, [FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiDynamicCompiler, [FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiConsoleOutput, string)][offset 0x00000015][found Char] Unexpected type on the stack.
-[IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+clo@3516-846::Invoke([S.P.CoreLib]System.Tuple`3<char[],int32,int32>)][offset 0x000001C7][found Char] Unexpected type on the stack.
+[IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+clo@3516-849::Invoke([S.P.CoreLib]System.Tuple`3<char[],int32,int32>)][offset 0x000001C7][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.Interactive.Shell+FsiInteractionProcessor::CompletionsForPartialLID([FSharp.Compiler.Service]FSharp.Compiler.Interactive.Shell+FsiDynamicCompilerState, string)][offset 0x00000024][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : <StartupCode$FSharp-Compiler-Service>.$FSharpCheckerResults+GetReferenceResolutionStructuredToolTipText@2205::Invoke([FSharp.Core]Microsoft.FSharp.Core.Unit)][offset 0x00000076][found Char] Unexpected type on the stack.
 [IL]: Error [StackUnexpected]: : FSharp.Compiler.EditorServices.AssemblyContent+traverseMemberFunctionAndValues@176::Invoke([FSharp.Compiler.Service]FSharp.Compiler.Symbols.FSharpMemberOrFunctionOrValue)][offset 0x0000002B][found Char] Unexpected type on the stack.