diff --git a/spdx/package.py b/spdx/package.py
index 75c50dbe6..93b62e2cd 100644
--- a/spdx/package.py
+++ b/spdx/package.py
@@ -12,14 +12,16 @@
 from datetime import datetime
 from enum import Enum
 from functools import reduce
-from typing import Optional
+from typing import Optional, Union
 
 from spdx import creationinfo
 from spdx import license
 from spdx import utils
 from spdx.checksum import Checksum, ChecksumAlgorithm
+from spdx.creationinfo import Creator
 from spdx.parsers.builderexceptions import SPDXValueError
 from spdx.parsers.loggers import ErrorMessages
+from spdx.utils import NoAssert
 
 
 class PackagePurpose(Enum):
@@ -95,8 +97,8 @@ def __init__(
         self.spdx_id = spdx_id
         self.version = version
         self.file_name = file_name
-        self.supplier = supplier
-        self.originator = originator
+        self.supplier: Optional[Union[Creator, NoAssert]] = supplier
+        self.originator: Optional[Union[Creator, NoAssert]] = originator
         self.download_location = download_location
         self.files_analyzed = None
         self.homepage = None
diff --git a/spdx/parsers/jsonyamlxml.py b/spdx/parsers/jsonyamlxml.py
index 5469376b0..ab384a017 100644
--- a/spdx/parsers/jsonyamlxml.py
+++ b/spdx/parsers/jsonyamlxml.py
@@ -20,7 +20,7 @@
 from spdx.parsers.builderexceptions import SPDXValueError, CardinalityError, OrderError
 from spdx.parsers.loggers import ErrorMessages
 from spdx.snippet import Snippet
-from spdx.utils import UnKnown
+from spdx.utils import UnKnown, NoAssert
 
 ERROR_MESSAGES = rdf.ERROR_MESSAGES
 
@@ -1243,6 +1243,8 @@ def parse_pkg_supplier(self, pkg_supplier):
         - pkg_supplier: Python str/unicode
         """
         if isinstance(pkg_supplier, str):
+            if pkg_supplier == "NOASSERTION":
+                return self.builder.set_pkg_supplier(self.document, NoAssert())
             entity = self.builder.create_entity(self.document, pkg_supplier)
             try:
                 return self.builder.set_pkg_supplier(self.document, entity)
@@ -1261,6 +1263,8 @@ def parse_pkg_originator(self, pkg_originator):
         - pkg_originator: Python str/unicode
         """
         if isinstance(pkg_originator, str):
+            if pkg_originator == "NOASSERTION":
+                return self.builder.set_pkg_originator(self.document, NoAssert())
             entity = self.builder.create_entity(self.document, pkg_originator)
             try:
                 return self.builder.set_pkg_originator(self.document, entity)