diff --git a/src/main/java/org/apache/datasketches/tdigest/TDigestDouble.java b/src/main/java/org/apache/datasketches/tdigest/TDigestDouble.java
index 680482781..4cd4169e0 100644
--- a/src/main/java/org/apache/datasketches/tdigest/TDigestDouble.java
+++ b/src/main/java/org/apache/datasketches/tdigest/TDigestDouble.java
@@ -117,6 +117,9 @@ public void update(final double value) {
    */
   public void merge(final TDigestDouble other) {
     if (other.isEmpty()) { return; }
+    // Extreme centroid means are not the true min/max when those centroids have weight > 1.
+    minValue_ = Math.min(minValue_, other.minValue_);
+    maxValue_ = Math.max(maxValue_, other.maxValue_);
     Math.addExact(getTotalWeight(), other.getTotalWeight());
     final int num = numCentroids_ + numBuffered_ + other.numCentroids_ + other.numBuffered_;
     final double[] values = new double[num];
diff --git a/src/test/java/org/apache/datasketches/tdigest/TDigestDoubleTest.java b/src/test/java/org/apache/datasketches/tdigest/TDigestDoubleTest.java
index 05dd73806..7d1d5937a 100644
--- a/src/test/java/org/apache/datasketches/tdigest/TDigestDoubleTest.java
+++ b/src/test/java/org/apache/datasketches/tdigest/TDigestDoubleTest.java
@@ -124,6 +124,33 @@ public void mergeSmall() {
     assertEquals(td1.getMaxValue(), 3);
   }
 
+  @Test
+  public void mergePreservesDeserializedMinMaxWithWeightedTails() {
+    final TDigestDouble source = new TDigestDouble();
+    source.update(0);
+    source.update(50);
+    source.update(90);
+    final byte[] bytes = source.toByteArray();
+    // serialized layout: preamble 16 bytes, min 8 bytes, max 8 bytes
+    MemorySegment.ofArray(bytes).set(ValueLayout.JAVA_DOUBLE_UNALIGNED, 16, -1.0);
+    MemorySegment.ofArray(bytes).set(ValueLayout.JAVA_DOUBLE_UNALIGNED, 24, 100.0);
+    final TDigestDouble other = TDigestDouble.heapify(MemorySegment.ofArray(bytes));
+    assertEquals(other.getMinValue(), -1.0);
+    assertEquals(other.getMaxValue(), 100.0);
+
+    final TDigestDouble empty = new TDigestDouble();
+    empty.merge(other);
+    assertEquals(empty.getMinValue(), -1.0);
+    assertEquals(empty.getMaxValue(), 100.0);
+
+    final TDigestDouble left = new TDigestDouble();
+    left.update(10);
+    left.update(20);
+    left.merge(other);
+    assertEquals(left.getMinValue(), -1.0);
+    assertEquals(left.getMaxValue(), 100.0);
+  }
+
   @Test
   public void mergeLarge() {
     final int n = 10000;