diff --git a/BUILD.bazel b/BUILD.bazel
index 71dde7020e..7ec36e4d9b 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -50,8 +50,8 @@ cuda_library(
 cc_library(
     name = "highs",
     srcs = ["highs/interfaces/highs_c_api.cpp"] + glob([
-        "extern/filereaderlp/*.cpp",
         "highs/io/*.cpp",
+        "highs/io/filereaderlp/*.cpp",
         "highs/ipm/*.cpp",
         "highs/ipm/ipx/*.cc",
         "highs/ipm/basiclu/*.c",
@@ -71,8 +71,8 @@ cc_library(
         "highs/mip/feasibilityjump.hh",
     ] + glob([
         "**/*.h",
+        "highs/io/filereaderlp/*.hpp",
         "highs/qpsolver/*.hpp",
-        "extern/filereaderlp/*.hpp",
         "extern/zstr/*.hpp",
     ]),
     copts = select({
diff --git a/THIRD_PARTY_NOTICES.md b/THIRD_PARTY_NOTICES.md
index 84e1cfcfa0..f39abc7cc6 100644
--- a/THIRD_PARTY_NOTICES.md
+++ b/THIRD_PARTY_NOTICES.md
@@ -28,17 +28,6 @@ The upstream source code is available at:
 
 CLI11 is only used to parse command line input for the HiGHS executable, so does not affect the license status of the HiGHS library or language interfaces to it.
 
-## filereaderlp
-
-The source code in `/extern/filereaderlp` is distributed under the [MIT license](https://opensource.org/license/MIT)
-at `/extern/filereaderlp/LICENSE`.
-
-It was originally developed by Michael Feldmeier.
-
-The upstream source code is available at:
-
- * https://github.com/feldmeier/FilereaderLP
-
 ## metis
 
 The source code in `/extern/metis` is distributed under the [Apache 2.0 license](https://opensource.org/license/apache-2-0)
diff --git a/check/TestLPFileFormat.cpp b/check/TestLPFileFormat.cpp
index 2870d074fa..9064b09cc3 100644
--- a/check/TestLPFileFormat.cpp
+++ b/check/TestLPFileFormat.cpp
@@ -1,7 +1,7 @@
 #include "HCheckConfig.h"
 #include "Highs.h"
 #include "catch.hpp"
-#include "filereaderlp/reader.hpp"
+#include "io/filereaderlp/reader.hpp"
 
 const bool dev_run = false;
 
diff --git a/cmake/sources-python.cmake b/cmake/sources-python.cmake
index b89ee37586..c60b376130 100644
--- a/cmake/sources-python.cmake
+++ b/cmake/sources-python.cmake
@@ -1,11 +1,11 @@
 set(include_dirs_python
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extern>
-    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extern/filereader>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extern/pdqsort>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extern/zstr>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/interfaces>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/io>
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/io/filereader>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/ipm>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/ipm/ipx>
     $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/ipm/basiclu>
@@ -176,7 +176,6 @@ set(ipx_sources_python
   highs/ipm/ipx/utils.h)
 
 set(highs_sources_python
-    extern/filereaderlp/reader.cpp
     highs/interfaces/highs_c_api.cpp
     highs/io/Filereader.cpp
     highs/io/FilereaderEms.cpp
@@ -186,6 +185,7 @@ set(highs_sources_python
     highs/io/HMpsFF.cpp
     highs/io/HMPSIO.cpp
     highs/io/LoadOptions.cpp
+    highs/io/filereaderlp/reader.cpp
     highs/ipm/IpxWrapper.cpp
     highs/lp_data/Highs.cpp
     highs/lp_data/HighsCallback.cpp
@@ -286,10 +286,6 @@ set(highs_sources_python
     highs/util/stringutil.cpp)
 
 set(highs_headers_python
-    extern/filereaderlp/builder.hpp
-    extern/filereaderlp/def.hpp
-    extern/filereaderlp/model.hpp
-    extern/filereaderlp/reader.hpp
     extern/pdqsort/pdqsort.h
     highs/interfaces/highs_c_api.h
     highs/io/Filereader.h
@@ -300,6 +296,10 @@ set(highs_headers_python
     highs/io/HMpsFF.h
     highs/io/HMPSIO.h
     highs/io/LoadOptions.h
+    highs/io/filereaderlp/builder.hpp
+    highs/io/filereaderlp/def.hpp
+    highs/io/filereaderlp/model.hpp
+    highs/io/filereaderlp/reader.hpp
     highs/ipm/IpxSolution.h
     highs/ipm/IpxWrapper.h
     highs/lp_data/HConst.h
diff --git a/cmake/sources.cmake b/cmake/sources.cmake
index 0167c8075d..4bedd7531e 100644
--- a/cmake/sources.cmake
+++ b/cmake/sources.cmake
@@ -1,11 +1,11 @@
 set(include_dirs
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extern>
-  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extern/filereader>
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extern/pdqsort>
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/extern/zstr>
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs>
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/interfaces>
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/io>
+  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/io/filereader>
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/ipm>
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/ipm/ipx>
   $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/highs/ipm/basiclu>
@@ -325,10 +325,9 @@ set(hipo_orderings_headers
     ../extern/rcm/rcm.h)
 
 # redefinition of 'kHighsInf'
-set_source_files_properties (../extern/filereaderlp/reader.cpp PROPERTIES SKIP_UNITY_BUILD_INCLUSION ON)
+set_source_files_properties (io/filereaderlp/reader.cpp PROPERTIES SKIP_UNITY_BUILD_INCLUSION ON)
 
 set(highs_sources
-    ../extern/filereaderlp/reader.cpp
     interfaces/highs_c_api.cpp
     io/Filereader.cpp
     io/FilereaderEms.cpp
@@ -338,6 +337,7 @@ set(highs_sources
     io/HMpsFF.cpp
     io/HMPSIO.cpp
     io/LoadOptions.cpp
+    io/filereaderlp/reader.cpp
     ipm/IpxWrapper.cpp
     lp_data/Highs.cpp
     lp_data/HighsCallback.cpp
@@ -440,10 +440,6 @@ set(highs_sources
 
 # add catch header?
 set(highs_headers
-    ../extern/filereaderlp/builder.hpp
-    ../extern/filereaderlp/def.hpp
-    ../extern/filereaderlp/model.hpp
-    ../extern/filereaderlp/reader.hpp
     ../extern/pdqsort/pdqsort.h
     ../extern/zstr/strict_fstream.hpp
     ../extern/zstr/zstr.hpp
@@ -456,6 +452,10 @@ set(highs_headers
     io/HMpsFF.h
     io/HMPSIO.h
     io/LoadOptions.h
+    io/filereaderlp/builder.hpp
+    io/filereaderlp/def.hpp
+    io/filereaderlp/model.hpp
+    io/filereaderlp/reader.hpp
     ipm/IpxSolution.h
     ipm/IpxWrapper.h
     lp_data/HConst.h
diff --git a/highs/io/FilereaderLp.cpp b/highs/io/FilereaderLp.cpp
index e3ea283dc2..0989022616 100644
--- a/highs/io/FilereaderLp.cpp
+++ b/highs/io/FilereaderLp.cpp
@@ -16,7 +16,7 @@
 #include <exception>
 #include <map>
 
-#include "../extern/filereaderlp/reader.hpp"
+#include "io/filereaderlp/reader.hpp"
 #include "lp_data/HighsLpUtils.h"
 
 FilereaderRetcode FilereaderLp::readModelFromFile(const HighsOptions& options,
@@ -290,7 +290,7 @@ FilereaderRetcode FilereaderLp::readModelFromFile(const HighsOptions& options,
                    sum_num_zero > 1 ? "s" : "");
 
   } catch (std::invalid_argument& ex) {
-    // lpassert in extern/filereaderlp/def.hpp throws
+    // lpassert in highs/io/filereaderlp/def.hpp throws
     // std::invalid_argument whatever the error. Hence, unless
     // something is done specially - here or elsewhere -
     // FilereaderRetcode::kParserError will be returned.
diff --git a/extern/filereaderlp/LICENSE b/highs/io/filereaderlp/LICENSE
similarity index 100%
rename from extern/filereaderlp/LICENSE
rename to highs/io/filereaderlp/LICENSE
diff --git a/extern/filereaderlp/builder.hpp b/highs/io/filereaderlp/builder.hpp
similarity index 94%
rename from extern/filereaderlp/builder.hpp
rename to highs/io/filereaderlp/builder.hpp
index b0c5c541c8..8196514c0d 100644
--- a/extern/filereaderlp/builder.hpp
+++ b/highs/io/filereaderlp/builder.hpp
@@ -5,7 +5,7 @@
 #include <string>
 #include <unordered_map>
 
-#include "model.hpp"
+#include "io/filereaderlp/model.hpp"
 
 struct Builder {
   std::unordered_map<std::string, std::shared_ptr<Variable>> variables;
diff --git a/extern/filereaderlp/def.hpp b/highs/io/filereaderlp/def.hpp
similarity index 100%
rename from extern/filereaderlp/def.hpp
rename to highs/io/filereaderlp/def.hpp
diff --git a/extern/filereaderlp/model.hpp b/highs/io/filereaderlp/model.hpp
similarity index 100%
rename from extern/filereaderlp/model.hpp
rename to highs/io/filereaderlp/model.hpp
diff --git a/extern/filereaderlp/reader.cpp b/highs/io/filereaderlp/reader.cpp
similarity index 99%
rename from extern/filereaderlp/reader.cpp
rename to highs/io/filereaderlp/reader.cpp
index 724ac50521..dd85d4179b 100644
--- a/extern/filereaderlp/reader.cpp
+++ b/highs/io/filereaderlp/reader.cpp
@@ -1,4 +1,4 @@
-#include "reader.hpp"
+#include "io/filereaderlp/reader.hpp"
 
 #include <algorithm>
 #include <array>
diff --git a/extern/filereaderlp/reader.hpp b/highs/io/filereaderlp/reader.hpp
similarity index 78%
rename from extern/filereaderlp/reader.hpp
rename to highs/io/filereaderlp/reader.hpp
index b86a954281..a6f7ed3ec9 100644
--- a/extern/filereaderlp/reader.hpp
+++ b/highs/io/filereaderlp/reader.hpp
@@ -3,7 +3,7 @@
 
 #include <string>
 
-#include "model.hpp"
+#include "io/filereaderlp/model.hpp"
 
 Model readinstance(std::string filename);
 
diff --git a/highs/meson.build b/highs/meson.build
index b442310708..815467d35d 100644
--- a/highs/meson.build
+++ b/highs/meson.build
@@ -193,7 +193,7 @@ _ipx_srcs = [
 ]
 
 _srcs = [
-    '../extern/filereaderlp/reader.cpp',
+    'io/filereaderlp/reader.cpp',
     'interfaces/highs_c_api.cpp',
     'io/Filereader.cpp',
     'io/FilereaderEms.cpp',
diff --git a/meson.build b/meson.build
index fb29be1878..d7a1450670 100644
--- a/meson.build
+++ b/meson.build
@@ -163,7 +163,6 @@ endif
 _incdirs += include_directories([
   'extern/',
   'extern/pdqsort/',
-  'extern/filereaderlp/',
 ])
 
 # Optional arguments