diff --git a/lib/Account.php b/lib/Account.php
index 155ef4795..14d1b5130 100644
--- a/lib/Account.php
+++ b/lib/Account.php
@@ -103,15 +103,6 @@ public static function retrieve($id = null, $opts = null)
     public function serializeParameters($force = false)
     {
         $update = parent::serializeParameters($force);
-        if (isset($this->_values['legal_entity'])) {
-            $entity = $this['legal_entity'];
-            if (isset($entity->_values['additional_owners'])) {
-                $owners = $entity['additional_owners'];
-                $entityUpdate = isset($update['legal_entity']) ? $update['legal_entity'] : [];
-                $entityUpdate['additional_owners'] = $this->serializeAdditionalOwners($entity, $owners);
-                $update['legal_entity'] = $entityUpdate;
-            }
-        }
         if (isset($this->_values['individual'])) {
             $individual = $this['individual'];
             if (($individual instanceof Person) && !isset($update['individual'])) {
@@ -122,35 +113,6 @@ public function serializeParameters($force = false)
         return $update;
     }
 
-    private function serializeAdditionalOwners($legalEntity, $additionalOwners)
-    {
-        if (isset($legalEntity->_originalValues['additional_owners'])) {
-            $originalValue = $legalEntity->_originalValues['additional_owners'];
-        } else {
-            $originalValue = [];
-        }
-        if (($originalValue) && (\count($originalValue) > \count($additionalOwners))) {
-            throw new Exception\InvalidArgumentException(
-                'You cannot delete an item from an array, you must instead set a new array'
-            );
-        }
-
-        $updateArr = [];
-        foreach ($additionalOwners as $i => $v) {
-            $update = ($v instanceof StripeObject) ? $v->serializeParameters() : $v;
-
-            if ([] !== $update) {
-                if (!$originalValue
-                    || !\array_key_exists($i, $originalValue)
-                    || ($update !== $legalEntity->serializeParamsValue($originalValue[$i], null, false, true))) {
-                    $updateArr[$i] = $update;
-                }
-            }
-        }
-
-        return $updateArr;
-    }
-
     /**
      * @param null|array $clientId
      * @param null|array|string $opts
diff --git a/tests/Stripe/AccountTest.php b/tests/Stripe/AccountTest.php
index 61ae41317..3f094546f 100644
--- a/tests/Stripe/AccountTest.php
+++ b/tests/Stripe/AccountTest.php
@@ -289,137 +289,6 @@ public function testCanListPersons()
         static::compatAssertIsArray($resources->data);
     }
 
-    // TODO (MAJOR): Remove legal_entity/additional_owners logic.
-    public function testSerializeNewAdditionalOwners()
-    {
-        /** @var Account $obj */
-        $obj = Util\Util::convertToStripeObject([
-            'object' => 'account',
-            'legal_entity' => StripeObject::constructFrom([]),
-        ], null);
-        $obj['legal_entity']->additional_owners = [
-            ['first_name' => 'Joe'],
-            ['first_name' => 'Jane'],
-        ];
-
-        $expected = [
-            'legal_entity' => [
-                'additional_owners' => [
-                    0 => ['first_name' => 'Joe'],
-                    1 => ['first_name' => 'Jane'],
-                ],
-            ],
-        ];
-        static::assertSame($expected, $obj->serializeParameters());
-    }
-
-    public function testSerializeAddAdditionalOwners()
-    {
-        $obj = Util\Util::convertToStripeObject([
-            'object' => 'account',
-            'legal_entity' => [
-                'additional_owners' => [
-                    StripeObject::constructFrom(['first_name' => 'Joe']),
-                    StripeObject::constructFrom(['first_name' => 'Jane']),
-                ],
-            ],
-        ], null);
-        $obj['legal_entity']->additional_owners[2] = ['first_name' => 'Andrew'];
-
-        $expected = [
-            'legal_entity' => [
-                'additional_owners' => [
-                    2 => ['first_name' => 'Andrew'],
-                ],
-            ],
-        ];
-        static::assertSame($expected, $obj->serializeParameters());
-    }
-
-    public function testSerializePartiallyChangedAdditionalOwners()
-    {
-        $obj = Util\Util::convertToStripeObject([
-            'object' => 'account',
-            'legal_entity' => [
-                'additional_owners' => [
-                    StripeObject::constructFrom(['first_name' => 'Joe']),
-                    StripeObject::constructFrom(['first_name' => 'Jane']),
-                ],
-            ],
-        ], null);
-        $obj['legal_entity']->additional_owners[1]->first_name = 'Stripe';
-
-        $expected = [
-            'legal_entity' => [
-                'additional_owners' => [
-                    1 => ['first_name' => 'Stripe'],
-                ],
-            ],
-        ];
-        static::assertSame($expected, $obj->serializeParameters());
-    }
-
-    public function testSerializeUnchangedAdditionalOwners()
-    {
-        $obj = Util\Util::convertToStripeObject([
-            'object' => 'account',
-            'legal_entity' => [
-                'additional_owners' => [
-                    StripeObject::constructFrom(['first_name' => 'Joe']),
-                    StripeObject::constructFrom(['first_name' => 'Jane']),
-                ],
-            ],
-        ], null);
-
-        $expected = [
-            'legal_entity' => [
-                'additional_owners' => [],
-            ],
-        ];
-        static::assertSame($expected, $obj->serializeParameters());
-    }
-
-    public function testSerializeUnsetAdditionalOwners()
-    {
-        $obj = Util\Util::convertToStripeObject([
-            'object' => 'account',
-            'legal_entity' => [
-                'additional_owners' => [
-                    StripeObject::constructFrom(['first_name' => 'Joe']),
-                    StripeObject::constructFrom(['first_name' => 'Jane']),
-                ],
-            ],
-        ], null);
-        $obj['legal_entity']->additional_owners = null;
-
-        // Note that the empty string that we send for this one has a special
-        // meaning for the server, which interprets it as an array unset.
-        $expected = [
-            'legal_entity' => [
-                'additional_owners' => '',
-            ],
-        ];
-        static::assertSame($expected, $obj->serializeParameters());
-    }
-
-    public function testSerializeAdditionalOwnersDeletedItem()
-    {
-        $this->expectException(\InvalidArgumentException::class);
-
-        $obj = Util\Util::convertToStripeObject([
-            'object' => 'account',
-            'legal_entity' => [
-                'additional_owners' => [
-                    StripeObject::constructFrom(['first_name' => 'Joe']),
-                    StripeObject::constructFrom(['first_name' => 'Jane']),
-                ],
-            ],
-        ], null);
-        unset($obj['legal_entity']->additional_owners[0]);
-
-        $obj->serializeParameters();
-    }
-
     public function testSerializeExternalAccountString()
     {
         $obj = Util\Util::convertToStripeObject([