diff --git a/ib_async/wrapper.py b/ib_async/wrapper.py
index 1ce3b01..96d746a 100644
--- a/ib_async/wrapper.py
+++ b/ib_async/wrapper.py
@@ -133,6 +133,7 @@
     55: "tradeRate",
     56: "volumeRate",
     58: "rtHistVolatility",
+    90: "ShortableStatus",
 }
 
 GREEKS_TICK_MAP: Final[TickDict] = {
@@ -1113,7 +1114,7 @@ def tickString(self, reqId: int, tickType: int, value: str):
                 ticker.askExchange = value
             elif tickType == 84:
                 ticker.lastExchange = value
-            elif tickType == 45:
+            elif tickType in {45, 88}:
                 timestamp = int(value)
 
                 # only populate if timestamp isn't '0' (we don't want to report "last trade: 20,000 days ago")