LAWYER PROFILE
Mark Leemen

Mark Leemen

Global 2026

Chambers ranking badge
Chambers ranking badge

Ranked in 2 practice areas

About

Provided by A&O Shearman

Practice Areas

Asian issuers and their sponsors and investment banks on cross-border equity and debt capital markets financings.

Mark has a broad corporate finance practice, representing issuers and investment banks on U.S. and international financing transactions, including and, Australian IPOs with a Rule 144A offering, high-yield and investment grade Rule 144A debt, U.S. debt private placements (USPPs) and commercial paper and MTN programs.

In addition, Mark has provided U.S. securities and corporate law advice to some of Australia’s leading companies, including BHP, Macquarie Group, Lend Lease, Transurban, Westfield, Amcor and AMP.

Mark has advised across a range of sectors including aviation, banking, energy, fast-moving consumer goods, financial services, gaming, infrastructure, media, mining and resources, pharmaceuticals, professional services, property, retailing and technology.

He has extensive transaction experience throughout Southeast Asia, having worked on major deals in Indonesia, Singapore, Malaysia and the Philippines.

Mark has been recommended by a number of independent directories, including Chambers Global, Chambers Asia-Pacific, IFLR 1000 and Legal 500. Since 2016, he has been ranked Band 1 for Capital Markets by Chambers, where he is described as “a very good communicator who gives straightforward and clear advice and is always available to deal with complex issues” and someone “who really knows his stuff and what is required when it comes to 144A debt issuances.” IFLR1000 describes him as a “very strong practitioner. Very responsive, commercial and pragmatic.”

Chambers Review

Provided by Chambers

Chambers Global Guide

Capital Markets: International - Australia

Band 1
Band 1

Individual Editorial

Mark Leemen is highly regarded for the provision of US law expertise from his Sydney base, frequently advising clients in relation to major capital raisings.

Capital Markets: Debt & Equity - USA

Expertise Based Abroad
USA, expertise based abroad in Australia

Individual Editorial
Mark Leemen is highly regarded for the provision of US law expertise from his Sydney base, frequently advising clients in relation to major capital raisings.

Strengths

Provided by Chambers

  • Mark is an excellent lawyer. He's very focused, knowledgeable, gives clear advice, always available and just very confident.

    Capital Markets: InternationalChambers Global Guide

Ranked Individuals at A&O Shearman (416)

Africa-wide

Asia-Pacific Region

Australia

Belgium

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