prime broker
as defined in Directive 2011/61/EU of the European Parliament and of the Council of 8 June…, Article 4(1), point (af) (Definitions)
a credit institution, a regulated investment firm or another entity subject to prudential regulation and ongoing supervision, offering services to professional investors primarily to finance or execute transactions in financial instruments as counterparty and which may also provide other services such as clearing and settlement of trades, custodial services, securities lending, customised technology and operational support facilities;