use DrupalnodeEntityNode;
use DrupalCoreUrl;

public function submitForm(array &$form, FormStateInterface $form_state) {

    $newCompanyNode = Node::create([
      'type' => 'company',
      'title' => $form_state->getValue('company'),
      //'field_name' => $value,
    ]);

    $newCompanyNode->save();
    drupal_set_message('Your company has been registered.', 'status');
    $url = DrupalCoreUrl::fromRoute('entity.node.canonical', ['node' => $newCompanyNode->id()]);
    return $form_state->setRedirectUrl($url);

  }