The following shall be eligible counterparties for the CSPP, both for outright transactions and for securities lending transactions involving corporate bonds held in the CSPP Eurosystem portfolios:
(a)((a)) entities that fulfil the eligibility criteria to participate in Eurosystem monetary policy operations pursuant to Article 55 of Guideline (EU) 2015/510 (ECB/2014/60); and
(b)((b)) any other counterparties that are used by Eurosystem central banks for the investment of their euro-denominated investment portfolios.