diff --git a/.github/workflows/build_mpich_source.yml b/.github/workflows/build_mpich_source.yml
index 25b715693fc..1bbb260d654 100644
--- a/.github/workflows/build_mpich_source.yml
+++ b/.github/workflows/build_mpich_source.yml
@@ -1,6 +1,7 @@
 # Build MPICH from source using the latest commit on the
 # 'main' branch and cache the results. The result is installed
-# to (or restored to) '${{ runner.workspace }}/mpich'.
+# to (or restored to) '${{ runner.workspace }}/mpich' and
+# an artifact called 'mpich' is saved for later use.
 
 # Triggers the workflow on a call from another workflow
 on:
@@ -80,3 +81,10 @@ jobs:
             --enable-threads=multiple
           make -j2
           make install
+
+      - name: Save MPICH installation artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: mpich
+          path: ${{ runner.workspace }}/mpich
+          if-no-files-found: error # 'warn' or 'ignore' are also available, defaults to `warn`
diff --git a/.github/workflows/build_openmpi_source.yml b/.github/workflows/build_openmpi_source.yml
index a617153cc4f..414c3df8e11 100644
--- a/.github/workflows/build_openmpi_source.yml
+++ b/.github/workflows/build_openmpi_source.yml
@@ -1,6 +1,7 @@
 # Build OpenMPI from source using the latest commit on the
 # 'main' branch and cache the results. The result is installed
-# to (or restored to) '${{ runner.workspace }}/openmpi'.
+# to (or restored to) '${{ runner.workspace }}/openmpi' and
+# an artifact called 'openmpi' is saved for later use.
 
 # Triggers the workflow on a call from another workflow
 on:
@@ -73,3 +74,10 @@ jobs:
             --enable-debug
           make -j2
           make install
+
+      - name: Save OpenMPI installation artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: openmpi
+          path: ${{ runner.workspace }}/openmpi
+          if-no-files-found: error # 'warn' or 'ignore' are also available, defaults to `warn`
diff --git a/.github/workflows/cmake-par-source.yml b/.github/workflows/cmake-par-source.yml
index 4b22f260639..9f9a3cd5123 100644
--- a/.github/workflows/cmake-par-source.yml
+++ b/.github/workflows/cmake-par-source.yml
@@ -27,14 +27,28 @@ permissions:
   contents: read
 
 jobs:
+  Build_openmpi_source:
+    name: Build OpenMPI from source
+    uses: ./.github/workflows/build_openmpi_source.yml
+    with:
+      build_mode: ${{ inputs.build_mode }}
+
+  Build_mpich_source:
+    name: Build MPICH from source
+    uses: ./.github/workflows/build_mpich_source.yml
+    with:
+      build_mode: ${{ inputs.build_mode }}
+
   CMake_build_parallel_src_openmpi:
+    needs: Build_openmpi_source
     name: "Parallel OpenMPI GCC-${{ inputs.build_mode }}"
     runs-on: ubuntu-latest
     steps:
-      - name: Build MPI (OpenMPI)
-        uses: ./.github/workflows/build_openmpi_source.yml
+      - name: Get OpenMPI installation
+        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
         with:
-          build_mode: ${{ inputs.build_mode }}
+          name: openmpi
+          path: ${{ runner.workspace }}/openmpi
 
       - name: Set path (OpenMPI)
         shell: bash
@@ -130,15 +144,17 @@ jobs:
           if-no-files-found: error # 'warn' or 'ignore' are also available, defaults to `warn`
 
   CMake_build_parallel_src_mpich:
+    needs: Build_mpich_source
     name: "Parallel Mpich GCC-${{ inputs.build_mode }}"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4.1.7
 
-      - name: Build MPI (MPICH)
-        uses: ./.github/workflows/build_mpich_source.yml
+      - name: Get MPICH installation
+        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
         with:
-          build_mode: ${{ inputs.build_mode }}
+          name: mpich
+          path: ${{ runner.workspace }}/mpich
 
       - name: Set path (MPICH)
         shell: bash