12 C.F.R. § 238.124
(a) Liquidity stress testing requirement—(1) General. A covered savings and loan holding company subject to this subpart must conduct stress tests to assess the potential impact of the liquidity stress scenarios set forth in paragraph (a)(3) of this section on its cash flows, liquidity position, profitability, and solvency, taking into account its current liquidity condition, risks, exposures, strategies, and activities.
(2) Frequency. The covered savings and loan holding company must perform the liquidity stress tests required under paragraph (a)(1) of this section according to the frequency specified in paragraph (a)(2)(i) or (ii) of this section or as directed by the Board:
(3) Stress scenarios.
(i) Each stress test conducted under paragraph (a)(1) of this section must include, at a minimum:
(5) Requirements for assets used as cash-flow sources in a stress test.
(b) Liquidity buffer requirement.
(3) Asset requirements. The liquidity buffer must consist of highly liquid assets that are unencumbered, as defined in paragraph (b)(3)(ii) of this section:
(i) Highly liquid asset. A highly liquid asset includes:
(C) Any other asset that the covered savings and loan holding company demonstrates to the satisfaction of the Board:
(1) Has low credit risk and low market risk;
(2) Is traded in an active secondary two-way market that has committed market makers and independent bona fide offers to buy and sell so that a price reasonably related to the last sales price or current bona fide competitive bid and offer quotations can be determined within one day and settled at that price within a reasonable time period conforming with trade custom; and
(3) Is a type of asset that investors historically have purchased in periods of financial market distress during which market liquidity has been impaired.
(ii) Unencumbered. An asset is unencumbered if it:
(B) Is either:
(1) Not pledged or used to secure or provide credit enhancement to any transaction; or
(2) Pledged to a central bank or a U.S. government-sponsored enterprise, to the extent potential credit secured by the asset is not currently extended by such central bank or U.S. government-sponsored enterprise or any of its consolidated subsidiaries.
(iv) Operational requirements. With respect to the liquidity buffer, the bank holding company must: