--- a
+++ b/singlecellmultiomics/statistic/trimming.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from .statistic import StatisticHistogram
+import singlecellmultiomics.pyutils as pyutils
+
+
+class TrimmingStats(StatisticHistogram):
+    def __init__(self, args):
+        StatisticHistogram.__init__(self, args)
+        self.totalFragmentsTrimmed = 0
+
+    def processRead(self, R1,R2=None):
+
+        for read in [R1,R2]:
+            if read is None:
+                continue
+
+            if read.has_tag('a1') or read.has_tag(
+                    'eB') or read.has_tag('A2') or read.has_tag('EB'):
+                self.totalFragmentsTrimmed += 1
+
+    def __repr__(self):
+        return f'Trimmed fragments: {self.totalFragmentsTrimmed}'
+
+    def __iter__(self):
+        yield 'Trimmed fragments', self.totalFragmentsTrimmed