diff --git a/kotlin/309-Best-Time-to-Buy-and-Sell-Stock-with-Cooldown.kt b/kotlin/309-Best-Time-to-Buy-and-Sell-Stock-with-Cooldown.kt
new file mode 100644
index 000000000..edb1e3bd1
--- /dev/null
+++ b/kotlin/309-Best-Time-to-Buy-and-Sell-Stock-with-Cooldown.kt
@@ -0,0 +1,15 @@
+class Solution {
+    fun maxProfit(prices: IntArray): Int {
+        var sold = 0
+        var hold = Int.MIN_VALUE
+        var rest = 0
+        
+        for (i in 0..prices.size-1) {
+            val prevSold = sold
+            sold = hold + prices[i]
+            hold = maxOf(hold, rest - prices[i])
+            rest = maxOf(rest, prevSold)
+        }
+        return maxOf(sold, rest)
+    }
+}
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