Ayman Guirguis advises clients on all aspects of antitrust and competition law as well as consumer law. Ayman has a wealth of experience advising clients on merger clearance, joint ventures and on supply chain arrangements between suppliers and customers. He also has experience defending court actions by the Australian Competition & Consumer Commission (ACCC) and other market participants and advising on, setting up and implementing competition law and consumer law compliance programs.
Ayman regularly advises on, and responds to, regulatory investigations by the ACCC alleging cartel conduct (price fixing, market sharing or bid rigging), including making immunity and leniency applications, competitor interactions at Industry Associations, as well as on other anti-competitive allegations such as misuse of market power, exclusivities, including defending litigation commenced by the ACCC.
Ayman also counsels clients on the Australian Consumer Law, including advertising and sales, marketing practices as well as compliance programs and audits.
Ayman has acted for clients across a range of industries including petroleum, oil and gas, property and construction, financial services, packaging, IT, retail, including food and fast moving consumer goods (FMCG) and pharmaceutical.
Prior to joining the firm, Ayman was a partner of two national Australian firms for a period of 16 years. He was also a senior officer in both the Mergers Branch and Enforcement branches of the ACCC.
- Recognised by Who's Who Legal: Australia and New Zealand as a leading practitioner for Competition, 2024
- Listed by Who's Who Legal Thought Leaders: Competition, 2024
- Recognised by The Legal 500 Asia Pacific as a Leading Individual for Competition and Trade in Australia, 2022-2024
"Ayman Guirguis is a stand out in this space. Ayman is attentive, highly responsive, knowledgeable, and experienced. Ayman is deeply experienced in liaising with regulators and understands what is required. Ayman’s advice is practical, honest, and succinct, all of which are critical when working to strict timeframes." (The Legal 500 Asia Pacific 2024)
"Ayman is well-respected, experienced and easy to work with. You always feel like he is giving you 110% attention and effort. He is refreshingly practical and realistic rather than being overly conservative. He goes out of his way to keep in touch. As he has clients across a number of industries, he sees a breadth of issues and regulatory engagement which is insightful." (The Legal 500 Asia Pacific 2023)
"Ayman Guirguis is a long-term legal partner and advisor to our business. He has a wide breadth of knowledge and experience which is highly trusted by our team." (The Legal 500 Asia Pacific 2023)
"Ayman Guirguis is very knowledgeable on competition and consumer law issues. He is also very easy to work with and has a deep understanding of our business, which makes him a valuable legal partner." (The Legal 500 Asia Pacific 2023)
Ayman Guirguis "always strives to understand his client’s businesses so he can provide relevant and practical advice. His advice is always well considered, detailed and with risk ratings to assist in-house counsel to make well-informed, strategic decisions with the business." (The Legal 500 Asia Pacific 2022)
Ayman Guirguis "has incredible attention to detail, and will run down every last fact or legal argument when providing advice." (The Legal 500 Asia Pacific 2022)
- Recognised as a Global Elite Thought Leader by Who's Who Legal in the area of Competition, 2021
- Listed Euromoney's Expert Guide for Competition and Antitrust in Australia, 2020-2021
- Lawyers Weekly, finalist in the Partner of the Year Awards for Competition, Trade and Regulation, 2020-2021
- Recognised by The Legal 500 Asia Pacific as a Recommended Lawyer in Australia
- Regulatory Compliance and Investigations, 2018-2020
- Competition and Trade, 2015-2021
Ayman Guirguis is identified by sources as "someone who takes the big picture and looks for solutions, as well as providing excellent legal analysis." (Chambers Asia-Pacific 2021)
- ommended by Who's Who Legal (Australia) in the area of Competition, 2017-2023
- Listed in The Best Lawyers in Australia™
- Competition Law, 2013-2025
- Commercial Law, 2025
- Recommended by Who's Who Legal (Global) in the area of Competition, 2012-2023
- Recognised by Chambers Asia-Pacific for Competition/Antitrust in Australia, 2008-2024
"I have been dealing with Ayman for more than ten years and have followed him between firms due to his deep industry knowledge and quick, commercial and pragmatic advice." and "Ayman is a pleasure to work with. He is deeply knowledgeable and incredibly practical and pragmatic." (Chambers Asia-Pacific 2024)
Ayman Guirguis "is very commercial, practical, easy to work with and responsive. He also has extensive and impressive experience across a range of sectors and clients, and has his finger on the pulse in relation to competition law developments and areas of regulatory focus." (Chambers Asia-Pacific 2022)
Ayman Guirguis has this "insight into the mind of the regulator" and "very thorough, practical and timely advice on how things will play out" and known for his "very affable, down-to-earth manner" and willingness for clients to "bounce ideas off him." (Chambers Asia-Pacific 2020)
- Law Council of Australia Competition and Consumer Law Committee member
- American Bar Association member
- International Bar Association member
- Association of Corporate Counsel member
- Law Society of New South Wales member
- "The Australian Government Ramps up Penalties for Competition and Consumer Law Breaches – AU$50 Million or 30% Turnover for Companies and AU$2.5 Million for Individuals," Kluwer Competition Law Blog, August 2022
- "Piercing the privilege veil in criminal cartels in Australia: Practical considerations for immunity (and leniency) applicants in seeking to reconcile their disclosure obligations", ABA/IBA International Cartel Workshop, June 2022
- "An offer you can’t refuse: big changes coming to the Unfair Contract Terms regime," Law Society Journal, 8 April 2022
- "Anti-trust in a Time of Global Crisis: An Australia Perspective," Australian Law Council's Annual Competition and Consumer Law Workshop, November 2020
- "Competition Law: Merger Clearance in Australia," Negotiated Acquisitions and Buyouts, November 2016
- Chapter 2 - Australia, The Cartels and Leniency Review - Edition 3, January 2015
- Chapter 1 - Australia, The Dominance & Monopolies Review, September 2014
- Quoted, "'Disappointing': Lawyers bemoan loss of ability to challenge ACCC's merger decisions in court", Lawyerly, April 2024
- Mentioned, "Americold’s AU$1.7 Billion Acquisition of Agro", Global Legal Chronicle, December 2021
- Mentioned, "Dicker Data buys New Zealand’s ‘second-largest’ IT distributor", LawyersWeekly.com.au, August 2021
- Mentioned, "Dye & Durham’s AU$170 Million Acquisition of GlobalX", Global Legal Chronicle, June 2021
- Mentioned, "K&L Gates assists in GlobalX merger", LawyersWeekly.com.au, June 2021
- Mentioned, "Swedish comms giant makes billion-dollar Aussie acquisition", LawyersWeekly.com.au, June 2021
- Mentioned, "Visy completes landmark glass packaging acquisition", LawyersWeekly.com.au, August 2020
- Mentioned, " ACCC greenlights pharmaceutical collaboration during COVID-19", LawyersWeekly.com.au, April 2020
