diff --git a/cmake/QtBuildRepoHelpers.cmake b/cmake/QtBuildRepoHelpers.cmake
index f35a2adb168..d8d14e87486 100644
--- a/cmake/QtBuildRepoHelpers.cmake
+++ b/cmake/QtBuildRepoHelpers.cmake
@@ -252,6 +252,7 @@ macro(qt_build_repo_begin)
 
     qt_internal_read_repo_dependencies(qt_repo_deps "${PROJECT_SOURCE_DIR}")
     if(qt_repo_deps)
+        set_property(GLOBAL PROPERTY _qt_repo_deps_${project_name_lower} ${qt_repo_deps})
         foreach(qt_repo_dep IN LISTS qt_repo_deps)
             if(TARGET qt_plugins_${qt_repo_dep})
                 message(DEBUG
diff --git a/cmake/QtPublicSbomGenerationHelpers.cmake b/cmake/QtPublicSbomGenerationHelpers.cmake
index 587bcabad0c..81d704fe60b 100644
--- a/cmake/QtPublicSbomGenerationHelpers.cmake
+++ b/cmake/QtPublicSbomGenerationHelpers.cmake
@@ -93,6 +93,7 @@ function(_qt_internal_sbom_begin_project_generate)
     set(opt_args "")
     set(single_args
         OUTPUT
+        OUTPUT_RELATIVE_PATH
         LICENSE
         COPYRIGHT
         DOWNLOAD_LOCATION
@@ -119,6 +120,8 @@ function(_qt_internal_sbom_begin_project_generate)
         "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_DATAROOTDIR}/${default_sbom_file_name}")
 
     qt_internal_sbom_set_default_option_value(OUTPUT "${default_install_sbom_path}")
+    qt_internal_sbom_set_default_option_value(OUTPUT_RELATIVE_PATH
+        "${default_sbom_file_name}")
 
     qt_internal_sbom_set_default_option_value(LICENSE "NOASSERTION")
     qt_internal_sbom_set_default_option_value(PROJECT_FOR_SPDX "${PROJECT_NAME}")
@@ -215,6 +218,7 @@ Relationship: SPDXRef-DOCUMENT DESCRIBES ${project_spdx_id}
 
     get_filename_component(computed_sbom_file_name "${arg_OUTPUT}" NAME_WLE)
     get_filename_component(computed_sbom_file_name_ext "${arg_OUTPUT}" LAST_EXT)
+    get_filename_component(computed_sbom_relative_dir "${arg_OUTPUT_RELATIVE_PATH}" DIRECTORY)
 
     get_cmake_property(is_multi_config GENERATOR_IS_MULTI_CONFIG)
     if(is_multi_config)
@@ -226,7 +230,14 @@ Relationship: SPDXRef-DOCUMENT DESCRIBES ${project_spdx_id}
     set(computed_sbom_file_name
         "${computed_sbom_file_name}${multi_config_suffix}${computed_sbom_file_name_ext}")
 
-    set(build_sbom_path "${sbom_dir}/${computed_sbom_file_name}")
+    # In a super build, put all the build time sboms into the same dir in qtbase.
+    if(QT_SUPERBUILD)
+        set(build_sbom_dir "${QtBase_BINARY_DIR}/qt_sbom")
+    else()
+        set(build_sbom_dir "${sbom_dir}")
+    endif()
+    set(build_sbom_path
+        "${build_sbom_dir}/${computed_sbom_relative_dir}/${computed_sbom_file_name}")
 
     # Create cmake file to append the document intro spdx to the staging file.
     set(create_staging_file "${sbom_dir}/append_document_to_staging${multi_config_suffix}.cmake")
@@ -375,6 +386,17 @@ function(_qt_internal_sbom_end_project_generate)
         VERBATIM
         USES_TERMINAL # To avoid running two configs of the command in parallel
     )
+
+    get_cmake_property(qt_repo_deps _qt_repo_deps_${repo_project_name_lowercase})
+    if(qt_repo_deps)
+        foreach(repo_dep IN LISTS qt_repo_deps)
+            set(repo_dep_sbom "sbom_${repo_dep}")
+            if(TARGET "${repo_dep_sbom}")
+                add_dependencies(${repo_sbom_target} ${repo_dep_sbom})
+            endif()
+        endforeach()
+    endif()
+
     add_dependencies(sbom ${repo_sbom_target})
 
     set(extra_code_begin "")
diff --git a/cmake/QtPublicSbomHelpers.cmake b/cmake/QtPublicSbomHelpers.cmake
index d5e85f7112d..8dfec929999 100644
--- a/cmake/QtPublicSbomHelpers.cmake
+++ b/cmake/QtPublicSbomHelpers.cmake
@@ -165,6 +165,7 @@ function(_qt_internal_sbom_begin_project)
 
     _qt_internal_sbom_begin_project_generate(
         OUTPUT "${repo_spdx_install_path}"
+        OUTPUT_RELATIVE_PATH "${repo_spdx_relative_install_path}"
         LICENSE "${repo_license}"
         COPYRIGHT "${repo_copyright}"
         SUPPLIER "${repo_supplier}" # This must not contain spaces!
@@ -192,6 +193,9 @@ function(_qt_internal_sbom_begin_project)
     set_property(GLOBAL PROPERTY _qt_internal_sbom_project_spdx_id
         "${repo_project_spdx_id}")
 
+    _qt_internal_get_current_project_sbom_dir(sbom_dir)
+    set_property(GLOBAL APPEND PROPERTY _qt_internal_sbom_dirs "${sbom_dir}")
+
     file(GLOB license_files "${PROJECT_SOURCE_DIR}/LICENSES/LicenseRef-*.txt")
     foreach(license_file IN LISTS license_files)
         get_filename_component(license_id "${license_file}" NAME_WLE)
@@ -975,7 +979,22 @@ function(_qt_internal_sbom_add_external_target_dependency
 
         # Only add a reference to the external document package, if we haven't done so already.
         if(NOT known_external_document)
+            set(install_prefixes "")
+
             get_cmake_property(install_prefix _qt_internal_sbom_install_prefix)
+            list(APPEND install_prefixes "${install_prefix}")
+
+            # Add the current sbom build dirs as install prefixes, so that we can use ninja 'sbom'
+            # in top-level builds. This is needed because the external references will point
+            # to sbom docs in different build dirs, not just one.
+            if(QT_SUPERBUILD)
+                get_cmake_property(build_sbom_dirs _qt_internal_sbom_dirs)
+                if(build_sbom_dirs)
+                    foreach(build_sbom_dir IN LISTS build_sbom_dirs)
+                        list(APPEND install_prefixes "${build_sbom_dir}")
+                    endforeach()
+                endif()
+            endif()
 
             set(external_document "${relative_installed_repo_document_path}")
 
@@ -984,7 +1003,7 @@ function(_qt_internal_sbom_add_external_target_dependency
                 EXTERNAL "${dep_spdx_id}"
                 FILENAME "${external_document}"
                 SPDXID "${external_document_ref}"
-                INSTALL_PREFIXES ${install_prefix}
+                INSTALL_PREFIXES ${install_prefixes}
             )
 
             set_property(GLOBAL PROPERTY