12 C.F.R. § 50.20
(a) Level 1 liquid assets. An asset is a level 1 liquid asset if it is one of the following types of assets:
(5) A security that is issued by, or unconditionally guaranteed as to the timely payment of principal and interest by, a sovereign entity, the Bank for International Settlements, the International Monetary Fund, the European Central Bank, European Community, or a multilateral development bank, that is:
(b) Level 2A liquid assets. An asset is a level 2A liquid asset if the asset is liquid and readily-marketable and is one of the following types of assets:
(2) A security that is issued by, or guaranteed as to the timely payment of principal and interest by, a sovereign entity or multilateral development bank that is:
(iii) Issued or guaranteed by an entity whose obligations have a proven record as a reliable source of liquidity in repurchase or sales markets during stressed market conditions, as demonstrated by:
(c) Level 2B liquid assets. An asset is a level 2B liquid asset if the asset is liquid and readily-marketable and is one of the following types of assets:
(1) A corporate debt security that is:
(ii) Issued or guaranteed by an entity whose obligations have a proven record as a reliable source of liquidity in repurchase or sales markets during stressed market conditions, as demonstrated by:
(2) A publicly traded common equity share that is:
(i) Included in:
(ii) Issued in:
(iii) Issued by an entity whose publicly traded common equity shares have a proven record as a reliable source of liquidity in repurchase or sales markets during stressed market conditions, as demonstrated by: