diff --git a/product_abc_classification/README.rst b/product_abc_classification/README.rst
index cc67bd9ddd4..02fdb720416 100644
--- a/product_abc_classification/README.rst
+++ b/product_abc_classification/README.rst
@@ -1,7 +1,3 @@
-.. image:: https://odoo-community.org/readme-banner-image
-   :target: https://odoo-community.org/get-involved?utm_source=readme
-   :alt: Odoo Community Association
-
 ==========================
 Product Abc Classification
 ==========================
@@ -17,7 +13,7 @@ Product Abc Classification
 .. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
     :target: https://odoo-community.org/page/development-status
     :alt: Beta
-.. |badge2| image:: https://img.shields.io/badge/license-AGPL--3-blue.png
+.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
     :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
     :alt: License: AGPL-3
 .. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fproduct--attribute-lightgray.png?logo=github
diff --git a/product_abc_classification/__manifest__.py b/product_abc_classification/__manifest__.py
index e4a4ea074ab..0b7f47ab15b 100644
--- a/product_abc_classification/__manifest__.py
+++ b/product_abc_classification/__manifest__.py
@@ -6,7 +6,7 @@
     "name": "Product Abc Classification",
     "summary": """
         ABC classification for sales and warehouse management""",
-    "version": "18.0.1.0.0",
+    "version": "18.0.1.1.0",
     "license": "AGPL-3",
     "author": "ACSONE SA/NV, ForgeFlow, Odoo Community Association (OCA)",
     "website": "https://github.com/OCA/product-attribute",
@@ -18,6 +18,7 @@
         "views/product_product.xml",
         "views/product_category.xml",
         "security/ir.model.access.csv",
+        "security/security.xml",
         "data/ir_cron.xml",
     ],
 }
diff --git a/product_abc_classification/migrations/18.0.1.1.0/post-migration.py b/product_abc_classification/migrations/18.0.1.1.0/post-migration.py
new file mode 100644
index 00000000000..df84acdd11a
--- /dev/null
+++ b/product_abc_classification/migrations/18.0.1.1.0/post-migration.py
@@ -0,0 +1,26 @@
+# Copyright 2026 ForgeFlow
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+import logging
+
+_logger = logging.getLogger(__name__)
+
+
+def migrate(cr, version):
+    if not version:
+        return
+    cr.execute(
+        """
+        UPDATE abc_classification_product_level AS lvl
+        SET company_id = tmpl.company_id
+        FROM product_product AS pp,
+             product_template AS tmpl
+        WHERE lvl.product_id = pp.id
+          AND pp.product_tmpl_id = tmpl.id
+          AND tmpl.company_id IS NOT NULL
+          AND lvl.company_id IS NULL;
+        """
+    )
+    _logger.info(
+        "Backfilled company_id on %s abc.classification.product.level rows",
+        cr.rowcount,
+    )
diff --git a/product_abc_classification/models/abc_classification_product_level.py b/product_abc_classification/models/abc_classification_product_level.py
index 505642afb2d..bd6d13b38f0 100644
--- a/product_abc_classification/models/abc_classification_product_level.py
+++ b/product_abc_classification/models/abc_classification_product_level.py
@@ -10,6 +10,7 @@ class AbcClassificationProductLevel(models.Model):
     _inherit = "mail.thread"
     _description = "Abc Classification Product Level"
     _rec_name = "level_id"
+    _check_company_auto = True
 
     manual_level_id = fields.Many2one(
         "abc.classification.level",
@@ -43,6 +44,7 @@ class AbcClassificationProductLevel(models.Model):
         index=True,
         required=True,
         ondelete="cascade",
+        check_company=True,
     )
     product_tmpl_id = fields.Many2one(
         "product.template",
@@ -50,11 +52,19 @@ class AbcClassificationProductLevel(models.Model):
         index=True,
         readonly=True,
     )
+    company_id = fields.Many2one(
+        "res.company",
+        compute="_compute_company_id",
+        store=True,
+        readonly=True,
+        index=True,
+    )
     # percentage
     profile_id = fields.Many2one(
         "abc.classification.profile",
         string="Profile",
         required=True,
+        check_company=True,
     )
     profile_type = fields.Selection(
         related="profile_id.profile_type",
@@ -124,6 +134,13 @@ def _compute_flag(self):
                 rec.computed_level_id and rec.manual_level_id != rec.computed_level_id
             )
 
+    @api.depends("product_id.company_id", "profile_id.company_id")
+    def _compute_company_id(self):
+        for rec in self:
+            rec.company_id = (
+                rec.profile_id.company_id or rec.product_id.company_id or False
+            )
+
     @api.model_create_multi
     def create(self, vals_list):
         for vals in vals_list:
diff --git a/product_abc_classification/models/abc_classification_profile.py b/product_abc_classification/models/abc_classification_profile.py
index 996186af797..e88574b20f9 100644
--- a/product_abc_classification/models/abc_classification_profile.py
+++ b/product_abc_classification/models/abc_classification_profile.py
@@ -28,6 +28,10 @@ class AbcClassificationProfile(models.Model):
         string="Period on which to compute the classification (Days)",
         required=True,
     )
+    company_id = fields.Many2one(
+        comodel_name="res.company",
+        string="Company",
+    )
 
     product_variant_ids = fields.Many2many(
         comodel_name="product.product",
@@ -47,6 +51,30 @@ class AbcClassificationProfile(models.Model):
 
     _sql_constraints = [("name_uniq", "UNIQUE(name)", "Profile name must be unique")]
 
+    @api.constrains("company_id", "product_variant_ids")
+    def _check_company_products(self):
+        for profile in self:
+            if not profile.company_id:
+                continue
+            bad = self.env["product.product"].search(
+                [
+                    ("id", "in", profile.product_variant_ids.ids),
+                    ("company_id", "!=", False),
+                    ("company_id", "!=", profile.company_id.id),
+                ]
+            )
+            if bad:
+                raise ValidationError(
+                    self.env._(
+                        "The ABC Classification Profile %(profile)s is assigned "
+                        "to company %(company)s, but the following products "
+                        "belong to another company: %(products)s.",
+                        profile=profile.display_name,
+                        company=profile.company_id.display_name,
+                        products=", ".join(bad.mapped("display_name")),
+                    )
+                )
+
     @api.constrains("level_ids")
     def _check_levels(self):
         for profile in self:
diff --git a/product_abc_classification/models/product_product.py b/product_abc_classification/models/product_product.py
index 31c79263d73..07196ef15ee 100644
--- a/product_abc_classification/models/product_product.py
+++ b/product_abc_classification/models/product_product.py
@@ -17,6 +17,7 @@ class ProductProduct(models.Model):
         column1="product_id",
         column2="profile_id",
         index=True,
+        check_company=True,
     )
     abc_classification_profile_updatable_from_category = fields.Boolean(default=True)
 
diff --git a/product_abc_classification/models/product_template.py b/product_abc_classification/models/product_template.py
index 48c01bbc47d..2f73ca74e40 100644
--- a/product_abc_classification/models/product_template.py
+++ b/product_abc_classification/models/product_template.py
@@ -13,6 +13,7 @@ class ProductTemplate(models.Model):
         compute="_compute_abc_classification_profile_ids",
         inverse="_inverse_abc_classification_profile_ids",
         store=True,
+        check_company=True,
     )
     abc_classification_product_level_ids = fields.One2many(
         "abc.classification.product.level",
diff --git a/product_abc_classification/security/security.xml b/product_abc_classification/security/security.xml
new file mode 100644
index 00000000000..9663d5b74df
--- /dev/null
+++ b/product_abc_classification/security/security.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<odoo noupdate="1">
+    <record id="abc_classification_profile_rule" model="ir.rule">
+        <field name="name">ABC Classification Profile multi-company</field>
+        <field name="model_id" ref="model_abc_classification_profile" />
+        <field eval="True" name="global" />
+        <field
+            name="domain_force"
+        >['|', ('company_id', '=', False), ('company_id', 'in', company_ids)]</field>
+    </record>
+    <record id="abc_classification_product_level_rule" model="ir.rule">
+        <field name="name">ABC Classification Product Level multi-company</field>
+        <field name="model_id" ref="model_abc_classification_product_level" />
+        <field eval="True" name="global" />
+        <field
+            name="domain_force"
+        >['|', ('company_id', '=', False), ('company_id', 'in', company_ids)]</field>
+    </record>
+</odoo>
diff --git a/product_abc_classification/static/description/index.html b/product_abc_classification/static/description/index.html
index bfaff2880f6..82441c28b52 100644
--- a/product_abc_classification/static/description/index.html
+++ b/product_abc_classification/static/description/index.html
@@ -3,7 +3,7 @@
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta name="generator" content="Docutils: https://docutils.sourceforge.io/" />
-<title>README.rst</title>
+<title>Product Abc Classification</title>
 <style type="text/css">
 
 /*
@@ -360,21 +360,16 @@
 </style>
 </head>
 <body>
-<div class="document">
+<div class="document" id="product-abc-classification">
+<h1 class="title">Product Abc Classification</h1>
 
-
-<a class="reference external image-reference" href="https://odoo-community.org/get-involved?utm_source=readme">
-<img alt="Odoo Community Association" src="https://odoo-community.org/readme-banner-image" />
-</a>
-<div class="section" id="product-abc-classification">
-<h1>Product Abc Classification</h1>
 <!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !! This file is generated by oca-gen-addon-readme !!
 !! changes will be overwritten.                   !!
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 !! source digest: sha256:f602d3cbe4b034e608e4a5b554b3532e87e682d94cb1ee8ba499905258e348c3
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
-<p><a class="reference external image-reference" href="https://odoo-community.org/page/development-status"><img alt="Beta" src="https://img.shields.io/badge/maturity-Beta-yellow.png" /></a> <a class="reference external image-reference" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/license-AGPL--3-blue.png" /></a> <a class="reference external image-reference" href="https://github.com/OCA/product-attribute/tree/18.0/product_abc_classification"><img alt="OCA/product-attribute" src="https://img.shields.io/badge/github-OCA%2Fproduct--attribute-lightgray.png?logo=github" /></a> <a class="reference external image-reference" href="https://translation.odoo-community.org/projects/product-attribute-18-0/product-attribute-18-0-product_abc_classification"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external image-reference" href="https://runboat.odoo-community.org/builds?repo=OCA/product-attribute&amp;target_branch=18.0"><img alt="Try me on Runboat" src="https://img.shields.io/badge/runboat-Try%20me-875A7B.png" /></a></p>
+<p><a class="reference external image-reference" href="https://odoo-community.org/page/development-status"><img alt="Beta" src="https://img.shields.io/badge/maturity-Beta-yellow.png" /></a> <a class="reference external image-reference" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/licence-AGPL--3-blue.png" /></a> <a class="reference external image-reference" href="https://github.com/OCA/product-attribute/tree/18.0/product_abc_classification"><img alt="OCA/product-attribute" src="https://img.shields.io/badge/github-OCA%2Fproduct--attribute-lightgray.png?logo=github" /></a> <a class="reference external image-reference" href="https://translation.odoo-community.org/projects/product-attribute-18-0/product-attribute-18-0-product_abc_classification"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external image-reference" href="https://runboat.odoo-community.org/builds?repo=OCA/product-attribute&amp;target_branch=18.0"><img alt="Try me on Runboat" src="https://img.shields.io/badge/runboat-Try%20me-875A7B.png" /></a></p>
 <p>This modules provides the bases to build ABC analysis (or ABC
 classification) addons. These classification are used by inventory
 management teams to help identify the most important products in their
@@ -400,7 +395,7 @@ <h1>Product Abc Classification</h1>
 </ul>
 </div>
 <div class="section" id="usage">
-<h2><a class="toc-backref" href="#toc-entry-1">Usage</a></h2>
+<h1><a class="toc-backref" href="#toc-entry-1">Usage</a></h1>
 <p>To use this module, you need to:</p>
 <p>#. Go to Inventory menu, then to Configuration/Products/ABC
 Classification Profile and create a profile with levels, knowing that
@@ -413,7 +408,7 @@ <h2><a class="toc-backref" href="#toc-entry-1">Usage</a></h2>
 child categories and products will be profiled (or unprofiled).</p>
 </div>
 <div class="section" id="bug-tracker">
-<h2><a class="toc-backref" href="#toc-entry-2">Bug Tracker</a></h2>
+<h1><a class="toc-backref" href="#toc-entry-2">Bug Tracker</a></h1>
 <p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/product-attribute/issues">GitHub Issues</a>.
 In case of trouble, please check there if your issue has already been reported.
 If you spotted it first, help us to smash it by providing a detailed and welcomed
@@ -421,16 +416,16 @@ <h2><a class="toc-backref" href="#toc-entry-2">Bug Tracker</a></h2>
 <p>Do not contact contributors directly about support or help with technical issues.</p>
 </div>
 <div class="section" id="credits">
-<h2><a class="toc-backref" href="#toc-entry-3">Credits</a></h2>
+<h1><a class="toc-backref" href="#toc-entry-3">Credits</a></h1>
 <div class="section" id="authors">
-<h3><a class="toc-backref" href="#toc-entry-4">Authors</a></h3>
+<h2><a class="toc-backref" href="#toc-entry-4">Authors</a></h2>
 <ul class="simple">
 <li>ACSONE SA/NV</li>
 <li>ForgeFlow</li>
 </ul>
 </div>
 <div class="section" id="contributors">
-<h3><a class="toc-backref" href="#toc-entry-5">Contributors</a></h3>
+<h2><a class="toc-backref" href="#toc-entry-5">Contributors</a></h2>
 <ul class="simple">
 <li>Miquel Raïch &lt;<a class="reference external" href="mailto:miquel.raich&#64;eficent.com">miquel.raich&#64;eficent.com</a>&gt;</li>
 <li>Lindsay Marion &lt;<a class="reference external" href="mailto:lindsay.marion&#64;acsone.eu">lindsay.marion&#64;acsone.eu</a>&gt;</li>
@@ -440,12 +435,12 @@ <h3><a class="toc-backref" href="#toc-entry-5">Contributors</a></h3>
 </ul>
 </div>
 <div class="section" id="other-credits">
-<h3><a class="toc-backref" href="#toc-entry-6">Other credits</a></h3>
+<h2><a class="toc-backref" href="#toc-entry-6">Other credits</a></h2>
 <p>The migration of this module from 17.0 to 18.0 was financially supported
 by Camptocamp</p>
 </div>
 <div class="section" id="maintainers">
-<h3><a class="toc-backref" href="#toc-entry-7">Maintainers</a></h3>
+<h2><a class="toc-backref" href="#toc-entry-7">Maintainers</a></h2>
 <p>This module is maintained by the OCA.</p>
 <a class="reference external image-reference" href="https://odoo-community.org">
 <img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" />
@@ -458,6 +453,5 @@ <h3><a class="toc-backref" href="#toc-entry-7">Maintainers</a></h3>
 </div>
 </div>
 </div>
-</div>
 </body>
 </html>
diff --git a/product_abc_classification/tests/__init__.py b/product_abc_classification/tests/__init__.py
index 8292c06ca32..9f90146243a 100644
--- a/product_abc_classification/tests/__init__.py
+++ b/product_abc_classification/tests/__init__.py
@@ -1,3 +1,4 @@
 from . import test_abc_classification_product_level
 from . import test_abc_classification_profile
 from . import test_product
+from . import test_multi_company
diff --git a/product_abc_classification/tests/test_multi_company.py b/product_abc_classification/tests/test_multi_company.py
new file mode 100644
index 00000000000..8750d10f764
--- /dev/null
+++ b/product_abc_classification/tests/test_multi_company.py
@@ -0,0 +1,83 @@
+# Copyright 2026 ForgeFlow
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo.exceptions import UserError, ValidationError
+from odoo.tests.common import tagged
+
+from .common import ABCClassificationLevelCase
+
+
+@tagged("post_install", "-at_install")
+class TestMultiCompany(ABCClassificationLevelCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.company_a = cls.env["res.company"].create({"name": "Company A"})
+        cls.company_b = cls.env["res.company"].create({"name": "Company B"})
+        cls.product_in_a = cls.env["product.product"].create(
+            {"name": "Prod A", "company_id": cls.company_a.id}
+        )
+        cls.product_in_b = cls.env["product.product"].create(
+            {"name": "Prod B", "company_id": cls.company_b.id}
+        )
+        cls.product_shared = cls.env["product.product"].create({"name": "Prod Shared"})
+
+    def test_shared_profile_inherits_product_company(self):
+        self.classification_profile.company_id = False
+        self.product_in_a.abc_classification_profile_ids = self.classification_profile
+        self.classification_profile._compute_abc_classification()
+        level = self.ProductLevel.search(
+            [
+                ("profile_id", "=", self.classification_profile.id),
+                ("product_id", "=", self.product_in_a.id),
+            ]
+        )
+        self.assertEqual(level.company_id, self.company_a)
+
+    def test_company_profile_overrides_product_company(self):
+        self.classification_profile.company_id = self.company_a
+        self.product_shared.abc_classification_profile_ids = self.classification_profile
+        self.classification_profile._compute_abc_classification()
+        level = self.ProductLevel.search(
+            [
+                ("profile_id", "=", self.classification_profile.id),
+                ("product_id", "=", self.product_shared.id),
+            ]
+        )
+        self.assertEqual(level.company_id, self.company_a)
+
+    def test_profile_constraint_conflicting_products(self):
+        self.product_in_b.abc_classification_profile_ids = self.classification_profile
+        with self.assertRaises(ValidationError):
+            self.classification_profile.company_id = self.company_a
+
+    def test_level_blocks_conflicting_profile_and_product(self):
+        self.classification_profile.company_id = self.company_a
+        with self.assertRaises(UserError):
+            self.ProductLevel.create(
+                {
+                    "profile_id": self.classification_profile.id,
+                    "product_id": self.product_in_b.id,
+                    "manual_level_id": self.classification_level_a.id,
+                }
+            )
+
+    def test_cannot_change_product_company_with_conflicting_profile(self):
+        self.classification_profile.company_id = self.company_a
+        self.product_shared.abc_classification_profile_ids = self.classification_profile
+        with self.assertRaises(UserError):
+            self.product_shared.company_id = self.company_b
+
+    def test_level_company_recomputes_on_profile_change(self):
+        self.classification_profile.company_id = False
+        self.product_shared.abc_classification_profile_ids = self.classification_profile
+        self.classification_profile._compute_abc_classification()
+        level = self.ProductLevel.search(
+            [
+                ("profile_id", "=", self.classification_profile.id),
+                ("product_id", "=", self.product_shared.id),
+            ]
+        )
+        self.assertFalse(level.company_id)
+        self.classification_profile.company_id = self.company_a
+        self.assertEqual(level.company_id, self.company_a)
diff --git a/product_abc_classification/views/abc_classification_profile.xml b/product_abc_classification/views/abc_classification_profile.xml
index 5af737940c6..69e9607fc03 100644
--- a/product_abc_classification/views/abc_classification_profile.xml
+++ b/product_abc_classification/views/abc_classification_profile.xml
@@ -32,6 +32,10 @@
                     <group>
                         <group name="information" string="Profile Information">
                             <field name="profile_type" />
+                            <field
+                                name="company_id"
+                                groups="base.group_multi_company"
+                            />
                         </group>
                         <group name="computation" string="Computation">
                             <field name="period" />
@@ -67,6 +71,7 @@
         <field name="arch" type="xml">
             <list>
                 <field name="name" />
+                <field name="company_id" groups="base.group_multi_company" />
             </list>
         </field>
     </record>