diff --git a/mcclellan_summation_index.pine b/mcclellan_summation_index.pine
new file mode 100644
index 0000000..14266ee
--- /dev/null
+++ b/mcclellan_summation_index.pine
@@ -0,0 +1,13 @@
+//@version=5
+indicator("McClellan Summation Index")
+
+var previousIndexValue = float(na)
+
+advances = request.security("ADVN", "D", close)
+declines = request.security("DECN", "D", close)
+
+oscillatorValue = ta.ema(advances - declines, 19) - ta.ema(advances - declines, 39)
+indexValue = nz(previousIndexValue) + oscillatorValue
+previousIndexValue := indexValue
+
+plot(indexValue)
\ No newline at end of file