diff --git a/test/unit_test/utils/test_register_custom_op.py b/test/unit_test/utils/test_register_custom_op.py
index 7a8bc318..4d23ba98 100644
--- a/test/unit_test/utils/test_register_custom_op.py
+++ b/test/unit_test/utils/test_register_custom_op.py
@@ -17,6 +17,7 @@
 
 import tico.utils.register_custom_op as register_custom_op
 import torch
+from torch._subclasses.fake_tensor import FakeTensorMode
 
 
 class TestRegisterCustomOp(unittest.TestCase):
@@ -415,6 +416,74 @@ def test_circle_quantize_mx_mocked(self, mock_quantize_mx):
             round="nearest",
         )
 
+    def test_circle_quantize_mx_decomposed_fake_tensor(self):
+        """Test CircleQuantizeMXDecomposed with FakeTensorMode"""
+        # These ops are designed to be fake ops only (assert False in impl)
+        # so test using FakeTensorMode
+        fake_mode = FakeTensorMode()
+        input_tensor = fake_mode.from_tensor(torch.randn(2, 32, 32, 3))
+        elem_format = "int8"
+        axis = -1
+
+        with fake_mode:
+            result = torch.ops.circle_custom.quantize_mx_decomposed(
+                input_tensor, elem_format, axis
+            )
+
+        # Check output shape matches input
+        self.assertEqual(list(result.shape), list(input_tensor.shape))
+
+    def test_circle_dequantize_mx_decomposed_fake_tensor(self):
+        """Test CircleDeQuantizeMXDecomposed with FakeTensorMode"""
+        # These ops are designed to be fake ops only (assert False in impl)
+        # so test using FakeTensorMode
+        fake_mode = FakeTensorMode()
+        input_tensor = fake_mode.from_tensor(torch.randn(2, 32, 32, 3))
+        elem_format = "int8"
+        axis = -1
+
+        with fake_mode:
+            result = torch.ops.circle_custom.dequantize_mx_decomposed(
+                input_tensor, elem_format, axis
+            )
+
+        # Check output shape matches input
+        self.assertEqual(list(result.shape), list(input_tensor.shape))
+
+    def test_circle_quantize_mx_decomposed_with_params_fake_tensor(self):
+        """Test CircleQuantizeMXDecomposed with all parameters using FakeTensorMode"""
+        fake_mode = FakeTensorMode()
+        input_tensor = fake_mode.from_tensor(torch.randn(2, 32, 32, 3))
+        elem_format = "int8"
+        axis = -1
+        shared_exp_method = "max"
+        round_method = "nearest"
+
+        with fake_mode:
+            result = torch.ops.circle_custom.quantize_mx_decomposed(
+                input_tensor, elem_format, axis, shared_exp_method, round_method
+            )
+
+        # Check output shape matches input
+        self.assertEqual(list(result.shape), list(input_tensor.shape))
+
+    def test_circle_dequantize_mx_decomposed_with_params_fake_tensor(self):
+        """Test CircleDeQuantizeMXDecomposed with all parameters using FakeTensorMode"""
+        fake_mode = FakeTensorMode()
+        input_tensor = fake_mode.from_tensor(torch.randn(2, 32, 32, 3))
+        elem_format = "int8"
+        axis = -1
+        shared_exp_method = "max"
+        round_method = "nearest"
+
+        with fake_mode:
+            result = torch.ops.circle_custom.dequantize_mx_decomposed(
+                input_tensor, elem_format, axis, shared_exp_method, round_method
+            )
+
+        # Check output shape matches input
+        self.assertEqual(list(result.shape), list(input_tensor.shape))
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tico/utils/register_custom_op.py b/tico/utils/register_custom_op.py
index 1b99de7c..8e021539 100644
--- a/tico/utils/register_custom_op.py
+++ b/tico/utils/register_custom_op.py
@@ -705,6 +705,58 @@ def _(
         return input_
 
 
+def CircleQuantizeMXDecomposed():
+    @custom_op("circle_custom::quantize_mx_decomposed", mutates_args=())
+    def quantize_mx(
+        input_: torch.Tensor,
+        elem_format: str,
+        axis: int,
+        shared_exp_method: str = "max",
+        round: str = "nearest",
+    ) -> torch.Tensor:
+        # this op should be fake one, so please consider different quantization scheme in case it failed here
+        raise RuntimeError(
+            "circle_custom::quantize_mx_decomposed is a fake-only op and must not be executed with real tensors"
+        )
+        return input_.new_empty(input_.size())
+
+    @register_fake("circle_custom::quantize_mx_decomposed")
+    def _(
+        input_: torch.Tensor,
+        elem_format: str,
+        axis: int,
+        shared_exp_method: str = "max",  # Fixed
+        round: str = "nearest",  # Fixed
+    ) -> torch.Tensor:
+        return input_
+
+
+def CircleDeQuantizeMXDecomposed():
+    @custom_op("circle_custom::dequantize_mx_decomposed", mutates_args=())
+    def dequantize_mx(
+        input_: torch.Tensor,
+        elem_format: str,
+        axis: int,
+        shared_exp_method: str = "max",
+        round: str = "nearest",
+    ) -> torch.Tensor:
+        # this op should be fake one, so please consider different quantization scheme in case it failed here
+        raise RuntimeError(
+            "circle_custom::dequantize_mx_decomposed is a fake-only op and must not be executed with real tensors"
+        )
+        return input_.clone()
+
+    @register_fake("circle_custom::dequantize_mx_decomposed")
+    def _(
+        input_: torch.Tensor,
+        elem_format: str,
+        axis: int,
+        shared_exp_method: str = "max",  # Fixed
+        round: str = "nearest",  # Fixed;
+    ) -> torch.Tensor:
+        return input_
+
+
 def CircleRMSNorm():
     @custom_op("circle_custom::rms_norm", mutates_args=())
     def rms_norm(
@@ -800,6 +852,8 @@ def RegisterOps():
     CircleAvgPool2D()
     CircleInstanceNorm()
     CircleQuantizeMX()
+    CircleQuantizeMXDecomposed()
+    CircleDeQuantizeMXDecomposed()
     CircleRMSNorm()
     CircleAttention()
     CircleShape()