(18)Collective investment undertakings may operate as undertakings for collective investment in transferable securities (UCITS) managed by UCITS management companies or by UCITS investment companies authorised under Directive 2009/65/EC or as alternative investment funds (AIFs) managed by alternative investment fund managers (AIFMs) authorised or registered under Directive 2011/61/EU. The new rules on transparency of SFTs and total return swaps introduced by this Regulation supplement, and should apply in addition to, the provisions of those Directives.