diff --git a/common/python/nomadcore/caching_backend.py b/common/python/nomadcore/caching_backend.py
index 9391cd68f77247b62b9c75f76ffa8069afdb6daf..b9da45a26c9494c2ee0efccd22164872a34b8571 100644
--- a/common/python/nomadcore/caching_backend.py
+++ b/common/python/nomadcore/caching_backend.py
@@ -333,10 +333,11 @@ class ActiveBackend(object):
         if self.propagateStartFinishParsing and self.superBackend:
             self.superBackend.startedParsingSession(mainFileUri, parserInfo, parsingStatus, parsingErrors)
 
-    def finishedParsingSession(self, parsingStatus, parsingErrors, mainFileUri = None, parserInfo = None):
+    def finishedParsingSession(self, parsingStatus, parsingErrors, mainFileUri = None, parserInfo = None,
+                               parsingStats = None):
         """should be called when the parsing finishes"""
         if self.propagateStartFinishParsing and self.superBackend:
-            self.superBackend.finishedParsingSession(parsingStatus, parsingErrors, mainFileUri, parserInfo)
+            self.superBackend.finishedParsingSession(parsingStatus, parsingErrors, mainFileUri, parserInfo, parsingStats)
 
     def addMatchTelemetry(self, match_telemetry, gIndex = -1):
         """ should be called for outputting match telemetry data:
diff --git a/common/python/nomadcore/local_backend.py b/common/python/nomadcore/local_backend.py
index 23eecc4ccd0f442d9da3b510ae6359e18811fd51..9bdc859fe96abb0a5d6482f8257172c69a506aa7 100644
--- a/common/python/nomadcore/local_backend.py
+++ b/common/python/nomadcore/local_backend.py
@@ -196,7 +196,8 @@ class LocalBackend(object):
     def startedParsingSession(self, mainFileUri, parserInfo, parsingStatus=None, parsingErrors=None):
         pass
 
-    def finishedParsingSession(self, parsingStatus, parsingErrors, mainFileUri=None, parserInfo=None):
+    def finishedParsingSession(self, parsingStatus, parsingErrors, mainFileUri=None, parserInfo=None,
+                               parsingStats=None):
         """Called when the parsing finishes.
         """
         pass
diff --git a/common/python/nomadcore/parser_backend.py b/common/python/nomadcore/parser_backend.py
index 9d977965cd11d57ea9422a49bddbf7d02584ce3d..f4c039194eb6819e4d4df574550b78886cb9ec63 100644
--- a/common/python/nomadcore/parser_backend.py
+++ b/common/python/nomadcore/parser_backend.py
@@ -115,7 +115,8 @@ class JsonParseEventsWriterBackend(object):
         self.fileOut.write(""",
   "events": [""")
 
-    def finishedParsingSession(self, parserStatus, parserErrors, mainFileUri = None, parserInfo = None):
+    def finishedParsingSession(self, parserStatus, parserErrors, mainFileUri = None, parserInfo = None,
+                               parsingStats = None):
         """should be called when the parsing finishes"""
         self.fileOut.write("]")
         if mainFileUri is not None and self.sessionMainFileUri is None:
diff --git a/common/python/nomadcore/simple_parser.py b/common/python/nomadcore/simple_parser.py
index 514b67396e1861d8e01029225f136b5385f7a5b6..380f70008976c307a2fcc62259c9f2d097dc41e6 100644
--- a/common/python/nomadcore/simple_parser.py
+++ b/common/python/nomadcore/simple_parser.py
@@ -1219,7 +1219,9 @@ def defaultParseFile(parserInfo):
         with open(path, "r") as fIn:
             backend.startedParsingSession(uri, parserInfo)
             parsingStats = runParser(parserBuilder, backend, superContext, fIn)
-            backend.finishedParsingSession("ParseSuccess", None)
+            backend.finishedParsingSession(
+                "ParseSuccess", None,
+                parsingStats=parsingStats)
     return parseF
 
 def mainFunction(mainFileDescription,