diff --git a/packages/typestats-site/src/typestats_site/_uv.py b/packages/typestats-site/src/typestats_site/_uv.py
index 203335ddc..3398a8a3e 100644
--- a/packages/typestats-site/src/typestats_site/_uv.py
+++ b/packages/typestats-site/src/typestats_site/_uv.py
@@ -1,5 +1,6 @@
 import logging
 import os
+import re
 import shutil
 import subprocess
 from typing import Final
@@ -121,14 +122,59 @@ async def _is_top_level_module(p: anyio.Path) -> bool:
     return p.suffix in {".py", ".pyi"} and p.stem.isidentifier()
 
 
-async def discover_packages(site_packages: StrPath, /) -> tuple[str, ...]:
-    """Return absolute paths of top-level packages/modules in *site_packages*.
+def _normalize_dist(name: str) -> str:
+    """PEP 503 normalized distribution name."""
+    return re.sub(r"[-_.]+", "-", name).lower()
 
-    Includes both package dirs (with `__init__.py[i]`) and single-file modules
-    (e.g. `six.py`). Falls back to *site_packages* itself when nothing matches.
+
+def _import_name(entry: str) -> str:
+    """Import name of a top-level `site-packages` entry (a `.py[i]` file's stem)."""
+    return re.sub(r"\.pyi?$", "", entry)
+
+
+async def _dist_modules(sp: anyio.Path, dist_name: str) -> set[str] | None:
+    """Import names installed by *dist_name* (from its `RECORD`), or `None`."""
+    target = _normalize_dist(dist_name)
+    async for child in sp.iterdir():
+        if child.suffix != ".dist-info":
+            continue
+
+        if _normalize_dist(child.stem.split("-", 1)[0]) != target:
+            continue
+
+        record = child / "RECORD"
+        if not await record.exists():
+            return None
+
+        names: set[str] = set()
+        for line in (await record.read_text()).splitlines():
+            top = line.split(",", 1)[0].split("/", 1)[0]
+            if not top or top.startswith(".") or top.endswith((".dist-info", ".data")):
+                continue
+            names.add(_import_name(top))
+        return names
+
+    return None
+
+
+async def discover_packages(
+    site_packages: StrPath,
+    /,
+    dist_name: str | None = None,
+) -> tuple[str, ...]:
+    """Absolute paths of top-level modules in *site_packages*.
+
+    With *dist_name*, only that distribution's own modules (not its installed
+    dependencies) are returned. Falls back to *site_packages* when empty.
     """
     sp = await anyio.Path(site_packages).resolve()
-    found = [str(p) async for p in sp.iterdir() if await _is_top_level_module(p)]
+    names = await _dist_modules(sp, dist_name) if dist_name else None
+    found = [
+        str(p)
+        async for p in sp.iterdir()
+        if await _is_top_level_module(p)
+        and (names is None or _import_name(p.name) in names)
+    ]
     return tuple(found) or (str(sp),)
 
 
diff --git a/packages/typestats-site/src/typestats_site/collect.py b/packages/typestats-site/src/typestats_site/collect.py
index 4385b63e2..58b39d348 100644
--- a/packages/typestats-site/src/typestats_site/collect.py
+++ b/packages/typestats-site/src/typestats_site/collect.py
@@ -109,7 +109,7 @@ async def collect_version(self, version: Version, out: Path) -> bool:
                 self.base_available = await available_versions(self.client, detected)
 
         pypi = PypiInfo.from_file_detail(self.eligible[version])
-        pyrefly_paths = await discover_packages(sp)
+        pyrefly_paths = await discover_packages(sp, dist_name=project.name)
 
         if base_name := self.base_name:
             assert self.base_available is not None
diff --git a/packages/typestats-site/src/typestats_site/from_project.py b/packages/typestats-site/src/typestats_site/from_project.py
index dcb86f889..4f233dcb5 100644
--- a/packages/typestats-site/src/typestats_site/from_project.py
+++ b/packages/typestats-site/src/typestats_site/from_project.py
@@ -75,7 +75,7 @@ async def from_project(
                 base_version=str(base_ver),
                 exclude=project.exclude,
                 pypi=PypiInfo.from_file_detail(dist_file),
-                pyrefly_paths=await discover_packages(sp),
+                pyrefly_paths=await discover_packages(sp, dist_name=project.name),
             ),
         )
 
@@ -86,6 +86,6 @@ async def from_project(
         FromPathOptions(
             exclude=project.exclude,
             pypi=PypiInfo.from_file_detail(dist_file),
-            pyrefly_paths=await discover_packages(sp),
+            pyrefly_paths=await discover_packages(sp, dist_name=project.name),
         ),
     )
diff --git a/packages/typestats-site/tests/test_uv.py b/packages/typestats-site/tests/test_uv.py
index 339ea9405..80235ce98 100644
--- a/packages/typestats-site/tests/test_uv.py
+++ b/packages/typestats-site/tests/test_uv.py
@@ -312,6 +312,36 @@ async def test_returns_absolute_paths_from_relative_input(
         assert result == (str(pkg.resolve()),)
         assert Path(result[0]).is_absolute()
 
+    @pytest.mark.parametrize(
+        ("module", "distinfo", "dist_name"),
+        [
+            ("mypkg", "mypkg-1.0.0.dist-info", "mypkg"),
+            ("my_mod.py", "My_Mod-2.0.dist-info", "My-Mod"),
+        ],
+        ids=["package", "normalized-file"],
+    )
+    async def test_scopes_to_dist_modules(
+        self, tmp_path: Path, module: str, distinfo: str, dist_name: str
+    ) -> None:
+        """With dist_name, only that distribution's own modules are returned."""
+        target = tmp_path / module
+        if module.endswith(".py"):
+            target.write_text("")
+            record = f"{module},,\n"
+        else:
+            target.mkdir()
+            (target / "__init__.py").write_text("")
+            record = f"{module}/__init__.py,,\n"
+
+        dep = tmp_path / "dep"  # installed dependency, not part of the distribution
+        dep.mkdir()
+        (dep / "__init__.py").write_text("")
+        (tmp_path / distinfo).mkdir()
+        (tmp_path / distinfo / "RECORD").write_text(record)
+
+        result = await discover_packages(tmp_path, dist_name=dist_name)
+        assert result == (str(target.resolve()),)
+
     async def test_mixed_package_and_module(self, tmp_path: Path) -> None:
         pkg = tmp_path / "mypkg"
         pkg.mkdir()