Populate Attendees By Company

// WP_User_Query arguments
$args = array(
	'meta_query'     => array(
		'relation' => 'OR',
		array(
			'key'     => '_company',
			'value'   => '$_REQUEST['input_' . $companyNameFieldId]',
			'compare' => '=',
		),
		array(
			'key'     => '_user_status',
			'value'   => 'active',
			'compare' => '=',
		),
	),
	'fields'         => array( 'ID', 'display_name', 'user_nicename' ),
);

// The User Query
$user_query = new WP_User_Query( $args );