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:
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);
any other counterparties that are used by Eurosystem central banks for the investment of their euro-denominated investment portfolios; and
the issuers of corporate bonds held in the CSPP Eurosystem portfolios, but only in the case of either:
a repurchase of the relevant corporate bond by that issuer pursuant to a buyback, or
the exercise by a Eurosystem central bank of a put option under the relevant corporate bond that is structured as a sale and repurchase transaction.