diff --git a/cover_agent/CoverageProcessor.py b/cover_agent/CoverageProcessor.py
index b459820c..08d07e8d 100644
--- a/cover_agent/CoverageProcessor.py
+++ b/cover_agent/CoverageProcessor.py
@@ -109,35 +109,60 @@ def parse_coverage_report(self) -> Tuple[list, list, float]:
 
     def parse_coverage_report_cobertura(self, filename: str = None) -> Union[Tuple[list, list, float], dict]:
         """
-        Parses a Cobertura XML code coverage report to extract covered and missed line numbers for a specific file
-        or all files, and calculates the coverage percentage.
+        Parses a Cobertura XML code coverage report to extract covered and missed line numbers
+        for a specific file or for all files (if filename is None). Aggregates coverage data from
+        multiple <class> entries that share the same filename.
 
         Args:
-            filename (str, optional): The name of the file to process. If None, processes all files.
+            filename (str, optional): Filename to process. If None, process all files.
 
         Returns:
-            Union[Tuple[list, list, float], dict]: If filename is provided, returns a tuple 
-                containing lists of covered and missed line numbers, and the coverage percentage. 
-                If filename is None, returns a dictionary with filenames as keys and a tuple 
-                containing lists of covered and missed line numbers, and the coverage percentage 
-                as values.
+            If filename is provided, returns (covered_lines, missed_lines, coverage_percent).
+            If filename is None, returns a dict: { filename: (covered_lines, missed_lines, coverage_percent) }.
         """
         tree = ET.parse(self.file_path)
         root = tree.getroot()
 
         if filename:
+            # Collect coverage for all <class> elements matching the given filename
+            all_covered, all_missed = [], []
             for cls in root.findall(".//class"):
                 name_attr = cls.get("filename")
                 if name_attr and name_attr.endswith(filename):
-                    return self.parse_coverage_data_for_class(cls)
-            return [], [], 0.0  # Return empty lists if the file is not found
+                    c_covered, c_missed, _ = self.parse_coverage_data_for_class(cls)
+                    all_covered.extend(c_covered)
+                    all_missed.extend(c_missed)
+
+            # Deduplicate and compute coverage
+            covered_set = set(all_covered)
+            missed_set = set(all_missed) - covered_set
+            total_lines = len(covered_set) + len(missed_set)
+            coverage_percentage = (len(covered_set) / total_lines) if total_lines else 0
+
+            return list(covered_set), list(missed_set), coverage_percentage
+
         else:
+            # Collect coverage for every <class>, grouping by filename
             coverage_data = {}
+            file_map = {}  # filename -> ([covered], [missed])
+
             for cls in root.findall(".//class"):
                 cls_filename = cls.get("filename")
                 if cls_filename:
-                    lines_covered, lines_missed, coverage_percentage = self.parse_coverage_data_for_class(cls)
-                    coverage_data[cls_filename] = (lines_covered, lines_missed, coverage_percentage)
+                    c_covered, c_missed, _ = self.parse_coverage_data_for_class(cls)
+                    if cls_filename not in file_map:
+                        file_map[cls_filename] = ([], [])
+                    file_map[cls_filename][0].extend(c_covered)
+                    file_map[cls_filename][1].extend(c_missed)
+
+            # Convert raw lists to sets, compute coverage, store results
+            for f_name, (c_covered, c_missed) in file_map.items():
+                covered_set = set(c_covered)
+                missed_set = set(c_missed) - covered_set
+                total_lines = len(covered_set) + len(missed_set)
+                coverage_percentage = (len(covered_set) / total_lines) if total_lines else 0
+                coverage_data[f_name] = (list(covered_set), list(missed_set), coverage_percentage)
+
             return coverage_data
 
     def parse_coverage_data_for_class(self, cls) -> Tuple[list, list, float]:
diff --git a/tests/test_CoverageProcessor.py b/tests/test_CoverageProcessor.py
index 4c06f1f1..0cfca1bf 100644
--- a/tests/test_CoverageProcessor.py
+++ b/tests/test_CoverageProcessor.py
@@ -21,6 +21,12 @@ def mock_parse(file_path):
                                             <line number="2" hits="0"/>
                                         </lines>
                                     </class>
+                                    <class filename="app.py">
+                                        <lines>
+                                            <line number="3" hits="1"/>
+                                            <line number="4" hits="0"/>
+                                        </lines>
+                                    </class>
                                 </classes>
                             </package>
                         </packages>
@@ -43,8 +49,8 @@ def test_parse_coverage_report_cobertura(self, mock_xml_tree, processor):
         """
         covered_lines, missed_lines, coverage_pct = processor.parse_coverage_report()
 
-        assert covered_lines == [1], "Should list line 1 as covered"
-        assert missed_lines == [2], "Should list line 2 as missed"
+        assert covered_lines == [1, 3], "Should list lines 1 and 3 as covered"
+        assert missed_lines == [2, 4], "Should list lines 2 and 4 as missed"
         assert coverage_pct == 0.5, "Coverage should be 50 percent"
 
     def test_correct_parsing_for_matching_package_and_class(self, mocker):
@@ -487,7 +493,7 @@ def test_parse_coverage_report_lcov_file_read_error(self, mocker):
     def test_parse_coverage_report_cobertura_all_files(self, mock_xml_tree, processor):
         coverage_data = processor.parse_coverage_report_cobertura()
         expected_data = {
-            "app.py": ([1], [2], 0.5)
+            "app.py": ([1, 3], [2, 4], 0.5)
         }
         assert coverage_data == expected_data, "Expected coverage data for all files"