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Simmons & Simmons

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Iain Cullen

Work 020 7825 4422
Simmons & Simmons


Iain is in the financial services group within the London financial markets department. Specialising in investment funds, Iain focuses particularly on structuring hedge funds and advising hedge fund managers. He has advised on the establishment of some of the largest and best known UK hedge fund managers, including Brevan Howard, BlueCrest, Lansdowne, Marshall Wace and Egerton.


Qualified 1980; partner 1986; (honorary) general counsel of the Alternative Investment Management Association (the global not-for-profit trade association for the hedge fund industry) since its foundation in 1990; co-chairman of the Commodities, Futures and Options Committee of the section on business law of the International Bar Association 1991-95; co-editor of ‘Hedge Funds: Law and Regulation’ (Sweet & Maxwell 2001); recently closely involved in commenting on the EU Directive on Alternative Investment Fund Managers; advisory board of World Securities Law Report; editorial board of Futures and Derivatives Law Report.

London: Investment fund formation and management

Hedge funds

Within: Leading individuals

Iain Cullen - Simmons & Simmons

Within: Hedge funds

Simmons & Simmons' market-leading reputation sees it act for more than three quarters of the largest UK and European hedge fund managers, over half of the largest US managers and over a third of the largest Asian hedge fund managers. At the other end of the spectrum, the firm also has a standout capability acting for start-up managers. Practice head Richard Perry, who has been a partner since 1999, is at the forefront of regulatory issues impacting the hedge funds industry and was a key player in the launch of the firm's Irish funds practice in 2018. Iain Cullen led a team advising Brevan Howard on the launch of the Brevan Howard Alpha Strategies Fund; this has a two-legged Cayman master feeder structure with feeders domiciled in the Cayman Islands and Delaware managed by Brevan Howard Capital Management LP in Jersey ,with the portfolio management being carried out from Geneva and London. Other mandates from clients have also involved issues connected with Brexit, the Senior Managers & Certification Regime (SMCR) and European Market Infrastructure Regulation (EMIR) Initial Margin. Dale Gabbert has more than 20 years of hedge funds experience. Devarshi Saksena, Lucian Firth and managing associate Sarah Crabb are also names to note.

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Legal Developments by:
Simmons & Simmons

  • Failure to counter financial crime: Norwich Union Life

    In December 2007, the Financial Services Authority (FSA) imposed a fine of £1.26m on Norwich Union Life (part of the Aviva Group), one of the largest life insurance businesses in the UK with around seven million customers. The fine related to failures to take reasonable care to establish and maintain effective systems and controls for countering the risks of financial crime. The fine is the latest confirmation of the emphasis being placed on protecting clients and customers from the threat of financial crime.
    - Simmons & Simmons

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