diff --git a/src/registrar/admin.py b/src/registrar/admin.py
index 538a96981..b2daebd9f 100644
--- a/src/registrar/admin.py
+++ b/src/registrar/admin.py
@@ -2938,7 +2938,9 @@ class PortfolioAdmin(ListHeaderAdmin):
         """Returns a comma seperated list of links for each related domain request"""
         queryset = obj.get_domain_requests()
         sep = '<div class="display-block margin-top-1"></div>'
-        return self.get_field_links_as_csv(queryset, "domainrequest", link_info_attribute="get_status_display", seperator=sep)
+        return self.get_field_links_as_csv(
+            queryset, "domainrequest", link_info_attribute="get_status_display", seperator=sep
+        )
 
     domain_requests.short_description = "Domain requests"
 
diff --git a/src/registrar/models/domain_information.py b/src/registrar/models/domain_information.py
index beffaede8..bdd67e582 100644
--- a/src/registrar/models/domain_information.py
+++ b/src/registrar/models/domain_information.py
@@ -430,4 +430,4 @@ class DomainInformation(TimeStampedModel):
         if self.domain:
             return self.domain.get_state_display()
         else:
-            return None
\ No newline at end of file
+            return None
diff --git a/src/registrar/models/portfolio.py b/src/registrar/models/portfolio.py
index 93944e10d..9bf1581f4 100644
--- a/src/registrar/models/portfolio.py
+++ b/src/registrar/models/portfolio.py
@@ -122,8 +122,9 @@ class Portfolio(TimeStampedModel):
 
     @property
     def portfolio_type(self):
-        """Returns a combination of organization_type and federal_type, 
-        seperated by ' - '. If no federal_type is found, we just return the org type."""
+        """
+        Returns a combination of organization_type / federal_type, seperated by ' - '.
+        If no federal_type is found, we just return the org type."""
         org_type = self.OrganizationChoices.get_org_label(self.organization_type)
         if self.organization_type == self.OrganizationChoices.FEDERAL and self.federal_type:
             return " - ".join([org_type, self.federal_type])
diff --git a/src/registrar/tests/common.py b/src/registrar/tests/common.py
index a4c3e2ef4..ceb3b6e92 100644
--- a/src/registrar/tests/common.py
+++ b/src/registrar/tests/common.py
@@ -906,6 +906,7 @@ def completed_domain_request(  # noqa
     federal_agency=None,
     federal_type=None,
     action_needed_reason=None,
+    portfolio=None,
 ):
     """A completed domain request."""
     if not user:
@@ -976,6 +977,9 @@ def completed_domain_request(  # noqa
     if action_needed_reason:
         domain_request_kwargs["action_needed_reason"] = action_needed_reason
 
+    if portfolio:
+        domain_request_kwargs["portfolio"] = portfolio
+
     domain_request, _ = DomainRequest.objects.get_or_create(**domain_request_kwargs)
 
     if has_other_contacts:
diff --git a/src/registrar/tests/test_admin.py b/src/registrar/tests/test_admin.py
index 4ec3336ba..120e2ef0b 100644
--- a/src/registrar/tests/test_admin.py
+++ b/src/registrar/tests/test_admin.py
@@ -23,6 +23,7 @@ from registrar.admin import (
     PublicContactAdmin,
     TransitionDomainAdmin,
     UserGroupAdmin,
+    PortfolioAdmin,
 )
 from registrar.models import (
     Domain,
@@ -38,6 +39,8 @@ from registrar.models import (
     FederalAgency,
     UserGroup,
     TransitionDomain,
+    Portfolio,
+    Suborganization,
 )
 from registrar.models.portfolio_invitation import PortfolioInvitation
 from registrar.models.senior_official import SeniorOfficial
@@ -2042,3 +2045,79 @@ class TestUserGroup(TestCase):
             response, "Groups are a way to bundle admin permissions so they can be easily assigned to multiple users."
         )
         self.assertContains(response, "Show more")
+
+
+class TestPortfolioAdmin(TestCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.site = AdminSite()
+        cls.superuser = create_superuser()
+        cls.admin = PortfolioAdmin(model=Portfolio, admin_site=cls.site)
+        cls.factory = RequestFactory()
+
+    def setUp(self):
+        self.client = Client(HTTP_HOST="localhost:8080")
+        self.portfolio = Portfolio.objects.create(organization_name="Test Portfolio", creator=self.superuser)
+
+    def tearDown(self):
+        Suborganization.objects.all().delete()
+        DomainInformation.objects.all().delete()
+        DomainRequest.objects.all().delete()
+        Domain.objects.all().delete()
+        Portfolio.objects.all().delete()
+
+    @less_console_noise_decorator
+    def test_created_on_display(self):
+        """Tests the custom created on which is a reskin of the created_at field"""
+        created_on = self.admin.created_on(self.portfolio)
+        expected_date = self.portfolio.created_at.strftime("%b %d, %Y")
+        self.assertEqual(created_on, expected_date)
+
+    @less_console_noise_decorator
+    def test_suborganizations_display(self):
+        """Tests the custom suborg field which displays all related suborgs"""
+        Suborganization.objects.create(name="Sub1", portfolio=self.portfolio)
+        Suborganization.objects.create(name="Sub2", portfolio=self.portfolio)
+
+        suborganizations = self.admin.suborganizations(self.portfolio)
+        self.assertIn("Sub1", suborganizations)
+        self.assertIn("Sub2", suborganizations)
+        self.assertIn('<div class="display-block margin-top-1"></div>', suborganizations)
+
+    @less_console_noise_decorator
+    def test_domains_display(self):
+        """Tests the custom domains field which displays all related domains"""
+        request_1 = completed_domain_request(
+            name="request1.gov", portfolio=self.portfolio, status=DomainRequest.DomainRequestStatus.IN_REVIEW
+        )
+        request_2 = completed_domain_request(
+            name="request2.gov", portfolio=self.portfolio, status=DomainRequest.DomainRequestStatus.IN_REVIEW
+        )
+
+        # Create some domain objects
+        request_1.approve()
+        request_2.approve()
+
+        domain_1 = DomainInformation.objects.get(domain_request=request_1).domain
+        domain_1.name = "domain1.gov"
+        domain_1.save()
+        domain_2 = DomainInformation.objects.get(domain_request=request_2).domain
+        domain_2.name = "domain2.gov"
+        domain_2.save()
+
+        domains = self.admin.domains(self.portfolio)
+        self.assertIn("domain1.gov", domains)
+        self.assertIn("domain2.gov", domains)
+        self.assertIn('<div class="display-block margin-top-1"></div>', domains)
+
+    @less_console_noise_decorator
+    def test_domain_requests_display(self):
+        """Tests the custom domains requests field which displays all related requests"""
+        completed_domain_request(name="request1.gov", portfolio=self.portfolio)
+        completed_domain_request(name="request2.gov", portfolio=self.portfolio)
+
+        domain_requests = self.admin.domain_requests(self.portfolio)
+        self.assertIn("request1.gov", domain_requests)
+        self.assertIn("request2.gov", domain_requests)
+        self.assertIn('<div class="display-block margin-top-1"></div>', domain_requests)