diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b16f46a73..9c4d42818a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Breaking Changes
 
+- [#11303](https://github.com/inventree/InvenTree/pull/11303) removes the `default_supplier` field from the `Part` model. Instead, the `SupplierPart` model now has a `primary` field which is used to indicate which supplier is the default for a given part. Any external client applications which made use of the old `default_supplier` field will need to be updated.
+
 ### Added
 
 [#11222](https://github.com/inventree/InvenTree/pull/11222) adds support for data import using natural keys, allowing for easier association of related objects without needing to know their internal database IDs.
diff --git a/src/backend/InvenTree/InvenTree/api_version.py b/src/backend/InvenTree/InvenTree/api_version.py
index edd864942c..ec23720717 100644
--- a/src/backend/InvenTree/InvenTree/api_version.py
+++ b/src/backend/InvenTree/InvenTree/api_version.py
@@ -1,11 +1,15 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 455
+INVENTREE_API_VERSION = 456
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v456 -> 2026-02-20 : https://github.com/inventree/InvenTree/pull/11303
+    - Adds "primary" field to the SupplierPart API
+    - Removes "default_supplier" field from the Part API
+
 v455 -> 2026-02-19 : https://github.com/inventree/InvenTree/pull/11383
     - Adds "exists_for_model_id" filter to ParameterTemplate API endpoint
     - Adds "exists_for_related_model" filter to ParameterTemplate API endpoint
diff --git a/src/backend/InvenTree/company/api.py b/src/backend/InvenTree/company/api.py
index 6005a2eb99..8c1fe8db05 100644
--- a/src/backend/InvenTree/company/api.py
+++ b/src/backend/InvenTree/company/api.py
@@ -249,6 +249,8 @@ class SupplierPartFilter(FilterSet):
 
     active = rest_filters.BooleanFilter(label=_('Supplier Part is Active'))
 
+    primary = rest_filters.BooleanFilter(label=_('Primary Supplier Part'))
+
     # Filter by 'active' status of linked part
     part_active = rest_filters.BooleanFilter(
         field_name='part__active', label=_('Internal Part is Active')
@@ -366,6 +368,7 @@ class SupplierPartList(
         'supplier',
         'manufacturer',
         'active',
+        'primary',
         'IPN',
         'MPN',
         'SKU',
diff --git a/src/backend/InvenTree/company/migrations/0078_supplierpart_primary.py b/src/backend/InvenTree/company/migrations/0078_supplierpart_primary.py
new file mode 100644
index 0000000000..0459589051
--- /dev/null
+++ b/src/backend/InvenTree/company/migrations/0078_supplierpart_primary.py
@@ -0,0 +1,22 @@
+# Generated by Django 5.2.11 on 2026-02-12 10:52
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("company", "0077_delete_manufacturerpartparameter"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="supplierpart",
+            name="primary",
+            field=models.BooleanField(
+                default=False,
+                help_text="Is this the primary supplier part for the linked Part?",
+                verbose_name="Primary",
+            ),
+        ),
+    ]
diff --git a/src/backend/InvenTree/company/migrations/0079_auto_20260212_1054.py b/src/backend/InvenTree/company/migrations/0079_auto_20260212_1054.py
new file mode 100644
index 0000000000..a045edae4a
--- /dev/null
+++ b/src/backend/InvenTree/company/migrations/0079_auto_20260212_1054.py
@@ -0,0 +1,55 @@
+# Generated by Django 5.2.11 on 2026-02-12 10:54
+
+from django.db import migrations
+
+
+def link_primary_supplier_part(apps, schema_editor):
+    """Mark 'primary' SupplierPart for each Part, if one exists."""
+
+    Part = apps.get_model("part", "Part")
+    SupplierPart = apps.get_model("company", "SupplierPart")
+
+    # Find any part which links to a "default_supplier"
+    primary_supplier_ids = Part.objects.exclude(
+        default_supplier=None,
+    ).values_list("default_supplier_id", flat=True).distinct()
+
+    if len(primary_supplier_ids) > 0:
+        # Mark the relevant SupplierPart objects as "primary"
+        SupplierPart.objects.filter(
+            pk__in=primary_supplier_ids
+        ).update(primary=True)
+
+        print(f"Marked {len(primary_supplier_ids)} SupplierPart objects as primary")
+
+
+def reverse_link_primary_supplier_part(apps, schema_editor):
+    """Add 'primary' SupplierPart for each Part."""
+
+    SupplierPart = apps.get_model("company", "SupplierPart")
+
+    # Find any SupplierPart object marked as "primary"
+    primary_supplier_parts = SupplierPart.objects.filter(primary=True)
+
+    if len(primary_supplier_parts) > 0:
+        # Unmark the relevant SupplierPart objects as "primary"
+
+        for supplier_part in primary_supplier_parts:
+            supplier_part.part.default_supplier = supplier_part
+            supplier_part.part.save()
+
+        print(f"Linked {len(primary_supplier_parts)} primary SupplierPart objects")
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("company", "0078_supplierpart_primary"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=link_primary_supplier_part,
+            reverse_code=reverse_link_primary_supplier_part,
+        ),
+    ]
diff --git a/src/backend/InvenTree/company/models.py b/src/backend/InvenTree/company/models.py
index f56b7c0912..90aeb23ae8 100644
--- a/src/backend/InvenTree/company/models.py
+++ b/src/backend/InvenTree/company/models.py
@@ -373,22 +373,19 @@ class Address(InvenTree.models.InvenTreeModel):
         Rules:
         - If this address is marked as "primary", ensure that all other addresses for this company are marked as non-primary
         """
-        others = list(
-            Address.objects.filter(company=self.company).exclude(pk=self.pk).all()
-        )
+        others = Address.objects.filter(company=self.company).exclude(pk=self.pk)
 
         # If this is the *only* address for this company, make it the primary one
-        if len(others) == 0:
+        if not others.exists():
             self.primary = True
 
         super().save(*args, **kwargs)
 
         # Once this address is saved, check others
         if self.primary:
-            for addr in others:
-                if addr.primary:
-                    addr.primary = False
-                    addr.save()
+            Address.objects.filter(company=self.company).exclude(pk=self.pk).filter(
+                primary=True
+            ).update(primary=False)
 
     @staticmethod
     def get_api_url():
@@ -612,6 +609,7 @@ class SupplierPart(
         source_item: The sourcing item linked to this SupplierPart instance
         supplier: Company that supplies this SupplierPart object
         active: Boolean value, is this supplier part active
+        primary: Boolean value, is this the primary supplier part for the linked Part
         SKU: Stock keeping unit (supplier part number)
         link: Link to external website for this supplier part
         description: Descriptive notes field
@@ -739,8 +737,21 @@ class SupplierPart(
         self.clean()
         self.validate_unique()
 
+        # Ensure that only one SupplierPart is marked as "primary" for a given Part
+        others = SupplierPart.objects.filter(part=self.part).exclude(pk=self.pk)
+
+        # If this is the *only* SupplierPart for this Part, make it the primary one
+        if not others.exists():
+            self.primary = True
+
         super().save(*args, **kwargs)
 
+        # Once this SupplierPart is saved, check others
+        if self.primary:
+            SupplierPart.objects.filter(part=self.part).exclude(pk=self.pk).filter(
+                primary=True
+            ).update(primary=False)
+
     part = models.ForeignKey(
         'part.Part',
         on_delete=models.CASCADE,
@@ -771,6 +782,12 @@ class SupplierPart(
         help_text=_('Is this supplier part active?'),
     )
 
+    primary = models.BooleanField(
+        default=False,
+        verbose_name=_('Primary'),
+        help_text=_('Is this the primary supplier part for the linked Part?'),
+    )
+
     manufacturer_part = models.ForeignKey(
         ManufacturerPart,
         on_delete=models.CASCADE,
diff --git a/src/backend/InvenTree/company/serializers.py b/src/backend/InvenTree/company/serializers.py
index ef12834e38..eae59f1980 100644
--- a/src/backend/InvenTree/company/serializers.py
+++ b/src/backend/InvenTree/company/serializers.py
@@ -354,6 +354,7 @@ class SupplierPartSerializer(
             'on_order',
             'link',
             'active',
+            'primary',
             'manufacturer_detail',
             'manufacturer_part',
             'manufacturer_part_detail',
diff --git a/src/backend/InvenTree/company/test_api.py b/src/backend/InvenTree/company/test_api.py
index 8ff721f123..6df854edd6 100644
--- a/src/backend/InvenTree/company/test_api.py
+++ b/src/backend/InvenTree/company/test_api.py
@@ -712,6 +712,32 @@ class SupplierPartTest(InvenTreeAPITestCase):
         for result in response.data:
             self.assertEqual(result['supplier'], company.pk)
 
+    def test_primary(self):
+        """Test for the 'primary' field in the SupplierPart model."""
+        for sp in SupplierPart.objects.filter(part=1):
+            self.patch(
+                reverse('api-supplier-part-detail', kwargs={'pk': sp.pk}),
+                {'primary': True},
+                expected_code=200,
+            )
+
+            # Only one supplier part should be primary for this part
+            self.assertEqual(
+                SupplierPart.objects.filter(part=1, primary=True).count(), 1
+            )
+
+            # Filter via the API
+            response = self.get(
+                reverse('api-supplier-part-list'),
+                {'part': 1, 'primary': True},
+                expected_code=200,
+            )
+
+            self.assertEqual(len(response.data), 1)
+
+        self.assertEqual(SupplierPart.objects.filter(part=1).count(), 4)
+        self.assertEqual(SupplierPart.objects.filter(part=1, primary=False).count(), 3)
+
     def test_filterable_fields(self):
         """Test inclusion/exclusion of optional API fields."""
         fields = {
diff --git a/src/backend/InvenTree/order/serializers.py b/src/backend/InvenTree/order/serializers.py
index 85b4b91d5f..c62ce69d90 100644
--- a/src/backend/InvenTree/order/serializers.py
+++ b/src/backend/InvenTree/order/serializers.py
@@ -14,9 +14,9 @@ from sql_util.utils import SubqueryCount, SubquerySum
 
 import build.serializers
 import common.filters
+import company.models as company_models
 import order.models
 import part.filters as part_filters
-import part.models as part_models
 import stock.models
 import stock.serializers
 from company.serializers import (
@@ -587,7 +587,7 @@ class PurchaseOrderLineItemSerializer(
         return queryset
 
     part = serializers.PrimaryKeyRelatedField(
-        queryset=part_models.SupplierPart.objects.all(),
+        queryset=company_models.SupplierPart.objects.all(),
         many=False,
         required=True,
         allow_null=True,
diff --git a/src/backend/InvenTree/part/admin.py b/src/backend/InvenTree/part/admin.py
index 377a0b1a4a..d1e0398952 100644
--- a/src/backend/InvenTree/part/admin.py
+++ b/src/backend/InvenTree/part/admin.py
@@ -25,7 +25,6 @@ class PartAdmin(admin.ModelAdmin):
         'variant_of',
         'category',
         'default_location',
-        'default_supplier',
         'bom_checked_by',
         'creation_user',
     ]
diff --git a/src/backend/InvenTree/part/migrations/0147_remove_part_default_supplier.py b/src/backend/InvenTree/part/migrations/0147_remove_part_default_supplier.py
new file mode 100644
index 0000000000..5b29121ced
--- /dev/null
+++ b/src/backend/InvenTree/part/migrations/0147_remove_part_default_supplier.py
@@ -0,0 +1,18 @@
+# Generated by Django 5.2.11 on 2026-02-12 11:08
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("company", "0079_auto_20260212_1054"),
+        ("part", "0146_auto_20251203_1241"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="part",
+            name="default_supplier",
+        ),
+    ]
diff --git a/src/backend/InvenTree/part/models.py b/src/backend/InvenTree/part/models.py
index 98ff555ecd..a5fb4c4e22 100644
--- a/src/backend/InvenTree/part/models.py
+++ b/src/backend/InvenTree/part/models.py
@@ -52,7 +52,6 @@ from build.status_codes import BuildStatusGroups
 from common.currency import currency_code_default
 from common.icons import validate_icon
 from common.settings import get_global_setting
-from company.models import SupplierPart
 from InvenTree import helpers, validators
 from InvenTree.exceptions import log_error
 from InvenTree.fields import InvenTreeURLField
@@ -490,7 +489,6 @@ class Part(
         link: Link to an external page with more information about this part (e.g. internal Wiki)
         image: Image of this part
         default_location: Where the item is normally stored (may be null)
-        default_supplier: The default SupplierPart which should be used to procure and stock this part
         default_expiry: The default expiry duration for any StockItem instances of this part
         minimum_stock: Minimum preferred quantity to keep in stock
         units: Units of measure for this part (default='pcs')
@@ -1215,31 +1213,14 @@ class Part(
         # Default case - no default category found
         return None
 
-    def get_default_supplier(self):
-        """Get the default supplier part for this part (may be None).
+    @property
+    def default_supplier(self):
+        """Return the default (primary) SupplierPart for this Part.
 
-        - If the part specifies a default_supplier, return that
-        - If there is only one supplier part available, return that
-        - Else, return None
+        This function is included for backwards compatibility,
+        as the 'Part' model used to have a 'default_supplier' field which was a ForeignKey to SupplierPart.
         """
-        if self.default_supplier:
-            return self.default_supplier
-
-        if self.supplier_count == 1:
-            return self.supplier_parts.first()
-
-        # Default to None if there are multiple suppliers to choose from
-        return None
-
-    default_supplier = models.ForeignKey(
-        SupplierPart,
-        on_delete=models.SET_NULL,
-        blank=True,
-        null=True,
-        verbose_name=_('Default Supplier'),
-        help_text=_('Default supplier part'),
-        related_name='default_parts',
-    )
+        return self.supplier_parts.filter(primary=True).first()
 
     default_expiry = models.PositiveIntegerField(
         default=0,
diff --git a/src/backend/InvenTree/part/serializers.py b/src/backend/InvenTree/part/serializers.py
index a0a00933eb..bb27afe074 100644
--- a/src/backend/InvenTree/part/serializers.py
+++ b/src/backend/InvenTree/part/serializers.py
@@ -576,7 +576,6 @@ class PartSerializer(
             'default_expiry',
             'default_location',
             'default_location_detail',
-            'default_supplier',
             'description',
             'full_name',
             'image',
diff --git a/src/backend/InvenTree/plugin/base/supplier/api.py b/src/backend/InvenTree/plugin/base/supplier/api.py
index 7dc6c6045b..3c288a238d 100644
--- a/src/backend/InvenTree/plugin/base/supplier/api.py
+++ b/src/backend/InvenTree/plugin/base/supplier/api.py
@@ -184,10 +184,10 @@ class ImportPart(APIView):
                     import_data, part=part, manufacturer_part=manufacturer_part
                 )
 
-                # set default supplier if not set
+                # Set as primary supplier if not already set
                 if not part.default_supplier:
-                    part.default_supplier = supplier_part
-                    part.save()
+                    supplier_part.primary = True
+                    supplier_part.save()
 
                 # get pricing
                 pricing = supplier_plugin.get_pricing_data(import_data)
diff --git a/src/backend/InvenTree/plugin/base/supplier/mixins.py b/src/backend/InvenTree/plugin/base/supplier/mixins.py
index 6542989a64..27c35d4d47 100644
--- a/src/backend/InvenTree/plugin/base/supplier/mixins.py
+++ b/src/backend/InvenTree/plugin/base/supplier/mixins.py
@@ -109,8 +109,8 @@ class SupplierMixin(SettingsMixin, Generic[PartData]):
         *,
         part: part_models.Part,
         manufacturer_part: company.models.ManufacturerPart,
-    ) -> part_models.SupplierPart:
-        """Import a supplier part using the provided data.
+    ) -> company.models.SupplierPart:
+        """Import a SupplierPart using the provided data.
 
         This may include:
           - Creating a new supplier part
diff --git a/src/frontend/src/forms/CompanyForms.tsx b/src/frontend/src/forms/CompanyForms.tsx
index 8336aa4fc8..de136355a4 100644
--- a/src/frontend/src/forms/CompanyForms.tsx
+++ b/src/frontend/src/forms/CompanyForms.tsx
@@ -71,6 +71,7 @@ export function useSupplierPartFields({
       packaging: {
         icon: <IconPackage />
       },
+      primary: {},
       active: {}
     };
 
diff --git a/src/frontend/src/forms/PartForms.tsx b/src/frontend/src/forms/PartForms.tsx
index 3177663aa9..2a54f9a10d 100644
--- a/src/frontend/src/forms/PartForms.tsx
+++ b/src/frontend/src/forms/PartForms.tsx
@@ -55,14 +55,6 @@ export function usePartFields({
           structural: false
         }
       },
-      default_supplier: {
-        hidden: !partId || !purchaseable,
-        filters: {
-          part: partId,
-          part_detail: true,
-          supplier_detail: true
-        }
-      },
       default_expiry: {},
       minimum_stock: {},
       responsible: {
diff --git a/src/frontend/src/pages/part/PartDetail.tsx b/src/frontend/src/pages/part/PartDetail.tsx
index 94b47236b0..22747010dd 100644
--- a/src/frontend/src/pages/part/PartDetail.tsx
+++ b/src/frontend/src/pages/part/PartDetail.tsx
@@ -692,16 +692,6 @@ export default function PartDetail() {
         badge: 'owner',
         hidden: !part.responsible
       },
-      {
-        type: 'link',
-        name: 'default_supplier',
-        label: t`Default Supplier`,
-        model: ModelType.supplierpart,
-        model_formatter: (model: any) => {
-          return model.SKU;
-        },
-        hidden: !part.default_supplier
-      },
       {
         name: 'default_expiry',
         label: t`Default Expiry`,
diff --git a/src/frontend/src/tables/purchasing/SupplierPartTable.tsx b/src/frontend/src/tables/purchasing/SupplierPartTable.tsx
index 26b7a9d040..ecdc42cf0b 100644
--- a/src/frontend/src/tables/purchasing/SupplierPartTable.tsx
+++ b/src/frontend/src/tables/purchasing/SupplierPartTable.tsx
@@ -99,6 +99,12 @@ export function SupplierPartTable({
         title: t`MPN`,
         render: (record: any) => record?.manufacturer_part_detail?.MPN
       },
+      BooleanColumn({
+        accessor: 'primary',
+        sortable: true,
+        switchable: true,
+        defaultVisible: false
+      }),
       BooleanColumn({
         accessor: 'active',
         title: t`Active`,
@@ -176,7 +182,9 @@ export function SupplierPartTable({
       supplier: supplierId,
       manufacturer_part: manufacturerPartId
     },
-    table: table,
+    onFormSuccess: (response: any) => {
+      table.refreshTable();
+    },
     successMessage: t`Supplier part created`
   });
 
@@ -215,6 +223,11 @@ export function SupplierPartTable({
         label: t`Active`,
         description: t`Show active supplier parts`
       },
+      {
+        name: 'primary',
+        label: t`Primary`,
+        description: t`Show primary supplier parts`
+      },
       {
         name: 'part_active',
         label: t`Active Part`,
@@ -243,7 +256,9 @@ export function SupplierPartTable({
     pk: selectedSupplierPart?.pk,
     title: t`Edit Supplier Part`,
     fields: useMemo(() => editSupplierPartFields, [editSupplierPartFields]),
-    table: table
+    onFormSuccess: (response: any) => {
+      table.refreshTable();
+    }
   });
 
   const duplicateSupplierPart = useCreateApiFormModal({
@@ -252,9 +267,12 @@ export function SupplierPartTable({
     fields: useMemo(() => editSupplierPartFields, [editSupplierPartFields]),
     initialData: {
       ...selectedSupplierPart,
+      primary: false,
       active: true
     },
-    table: table,
+    onFormSuccess: (response: any) => {
+      table.refreshTable();
+    },
     successMessage: t`Supplier part created`
   });
 
diff --git a/src/frontend/tests/pages/pui_company.spec.ts b/src/frontend/tests/pages/pui_company.spec.ts
index d2e27cbb0e..0d5834f1aa 100644
--- a/src/frontend/tests/pages/pui_company.spec.ts
+++ b/src/frontend/tests/pages/pui_company.spec.ts
@@ -1,8 +1,10 @@
 import { test } from '../baseFixtures.js';
 import {
+  clearTableFilters,
   clickOnParamFilter,
   loadTab,
   navigate,
+  setTableChoiceFilter,
   showParametricView
 } from '../helpers.js';
 import { doCachedLogin } from '../login.js';
@@ -63,3 +65,24 @@ test('Company - Parameters', async ({ browser }) => {
   await page.getByRole('cell', { name: 'Arrow Electronics' }).waitFor();
   await page.getByRole('cell', { name: 'PCB assembly house' }).waitFor();
 });
+
+test('Company - Supplier Parts', async ({ browser }) => {
+  const page = await doCachedLogin(browser, {
+    username: 'steven',
+    password: 'wizardstaff',
+    url: 'purchasing/index/suppliers'
+  });
+
+  await loadTab(page, 'Supplier Parts');
+  await clearTableFilters(page);
+
+  await page.getByText('- 25 / 777').waitFor();
+
+  await setTableChoiceFilter(page, 'Primary', 'Yes');
+  await page.getByText('- 25 / 318').waitFor();
+
+  await clearTableFilters(page);
+
+  await setTableChoiceFilter(page, 'Primary', 'No');
+  await page.getByText('- 25 / 459').waitFor();
+});
diff --git a/tasks.py b/tasks.py
index e52ae21cb7..7e01bd1de4 100644
--- a/tasks.py
+++ b/tasks.py
@@ -1142,7 +1142,7 @@ def import_records(
         os.remove(datafile)
         os.remove(authfile)
 
-    info('Data import completed')
+    success('Data import completed')
 
 
 @task(