diff --git a/MarketData/MarketDataLib/Cache/GBPriceCache.cs b/MarketData/MarketDataLib/Cache/GBPriceCache.cs
index 167c4ee..2affb9b 100755
--- a/MarketData/MarketDataLib/Cache/GBPriceCache.cs
+++ b/MarketData/MarketDataLib/Cache/GBPriceCache.cs
@@ -43,6 +43,8 @@ namespace MarketData.Cache
 
   public class GBPriceCache : IDisposable
   {
+    private static readonly int EVICTION_DAYCOUNT=252;  // upon eviction trigger remove all data older than maxdate - evictionPolicyThreshholdDays
+
     private Thread cacheMonitorThread = null;
     private volatile bool threadRun = true;
     private Object thisLock = new Object();
@@ -52,7 +54,7 @@ namespace MarketData.Cache
     private DateGenerator dateGenerator = new DateGenerator();
     private static GBPriceCache priceCacheInstance = null;
     private int cacheRefreshAfter = 120000; // 2 minutes
-    private SemaphoreSlim fetchSemaphore = new SemaphoreSlim(8); // max 8 concurrent DB fetches
+    private SemaphoreSlim fetchSemaphore = new SemaphoreSlim(8);    // max 8 concurrent DB fetches
     public IPricingDataAccess PricingDataAccess { get; set; } = new RealPricingDA();
 
     protected GBPriceCache()
@@ -330,9 +332,13 @@ namespace MarketData.Cache
             DateTime maxDate = snapshot.PriceCache.Values.SelectMany(p => p.Keys).DefaultIfEmpty(DateTime.MinValue).Max();
             if (maxDate != DateTime.MinValue)
             {
-              DateTime evictBefore = dateGenerator.GenerateHistoricalDates(maxDate, 252).Min();
-              MDTrace.WriteLine(LogLevel.DEBUG, $"GBPriceCache, clearing cache on or before {evictBefore.ToShortDateString()}");
-              UpdateSnapshot(BuildEvictedPriceCache(evictBefore), new Dictionary<String, Price>(), new Dictionary<String, bool>());
+              DateTime evictBefore = dateGenerator.GenerateHistoricalDates(maxDate, EVICTION_DAYCOUNT).Min();
+              int beforeCount = snapshot.PriceCache.Values.Sum(p => p.Count);
+              Dictionary<String, PricesByDate> newCache = BuildEvictedPriceCache(evictBefore);
+              int afterCount = newCache.Values.Sum(p => p.Count);
+              int removed = beforeCount - afterCount;
+              MDTrace.WriteLine(LogLevel.DEBUG, $"GBPriceCache eviction: removed {removed} prices (before={beforeCount}, after={afterCount}) on or before {evictBefore.ToShortDateString()}");
+              UpdateSnapshot(newCache, new Dictionary<String, Price>(), new Dictionary<String, bool>());
               GC.Collect();
             }
           }