Here is an example of moving company field to the first of all fields.

add_filter( 'woocommerce_default_address_fields', 'mymentech_reorder_checkout_fields' );
 
function mymentech_reorder_checkout_fields( $fields ) {
  // just assign priority less than 10
  $fields['company']['priority'] = 8;
 return $fields;
}

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