

Mangioni Biggs + Co
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About Us
Mangioni Biggs + Co is a distinguished boutique law firm based in Sydney, renowned for offering comprehensive legal representation across a range of corporate and commercial transactional matters and disputes. With an emphasis on commercial realities, we ensure that our documentation and advice provide tangible value, assisting clients in achieving their commercial goals. Our expertise spans multiple legal disciplines, including complex corporate deals—particularly in mergers and acquisitions, equity capital markets, and corporate governance. In insolvency matters, we strike a balance between technical solutions and commercial pragmatism to achieve our clients' objectives cost-effectively. Our litigation team is equipped to handle any commercial litigation or alternative dispute resolution process across Australia. For private clients, we deliver tailored legal services addressing personal, familial, and business needs. In the property sector, our comprehensive services cover industrial, commercial, residential property transactions, and rural land matters. In regulatory affairs, we represent individuals and businesses in investigations, enforcement proceedings, and prosecutions, leveraging our extensive experience to shield our clients effectively. Our team comprises inventive and tenacious problem-solvers, aimed at realising clients' objectives promptly. The firm was founded by Robert Mangioni, John Biggs, and David McGuiness, each a former director of Watson Mangioni. Recognised by Best Lawyers and Doyles Guide, our firm is tagged as a leading entity in our core practice areas. We cater to a diverse clientele, including large private companies, ASX-listed entities, directors, senior executives, and high-net-worth individuals. We ensure our clients enjoy direct access to our seasoned partners, recognised for their robust and reliable legal counsel aimed at achieving outstanding commercial outcomes. Our services are underpinned by clear, commercially relevant advice, inventive solutions, and determined litigation strategies. We maintain open communication channels, ensuring client expectations are met efficiently and cost-effectively. Mangioni Biggs + Co acts as an alternative to large firms by focusing on delivering exceptional outcomes without unnecessary formalities. We collaborate with other specialists as required, maintaining a broad referral network of professionals who respect our expertise. Handling both prominent business transactions and sensitive private matters, we offer trusted legal services fostering lasting client relationships. We operate on an interstate and international basis, utilising a trusted network for cross-border matters, ensuring consistency in approach and quality of service. We are ready to provide references from clients willing to attest to our capabilities and approach for those considering our firm for legal representation.
Practice Areas
Specialisations
Commercial Law
Mangioni Biggs + Co is dedicated to delivering high-quality legal representation in commercial law, focusing on the practical realities of each matter to provide documentation and advice that aligns with clients’ commercial objectives. Our team is adept at navigating complex corporate environments, ensuring that our clients' interests are at the forefront of all transactions and disputes. With extensive experience in corporate transactions, our lawyers guide clients through mergers and acquisitions, capital markets, and governance issues, employing a strategic approach that balances technical expertise with commercial insight. This enables us to efficiently address challenges and achieve timely, effective results, all while maintaining open communication to keep clients informed at every stage of the process.
Litigation & Disputes
The team at Mangioni Biggs + Co brings extensive experience in handling a broad spectrum of commercial litigation and alternative dispute resolution processes throughout Australia. Their focus on understanding the intricacies of each case allows them to develop tailored strategies that align with their clients' specific goals, ensuring efficient and effective representation. Their commitment to providing timely, results-driven legal services is reinforced by a collaborative approach, where open communication and regular updates keep clients informed and engaged. With a deep understanding of the complexities involved in disputes, Mangioni Biggs + Co stands ready to effectively navigate challenging situations, striving for optimal outcomes that reflect their clients' best interests.
Our Team
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Practice Categories
- Company Secretarial
- Farm Succession Planning
- General Advice
- Notary Public
- Strata Law
- Superannuation
- Tax Law
- Technology Law
- Trusts
- Alternative Dispute Resolution
- Building and Construction
- Civil
- Debt Recovery
- Defamation
- Disability
- General Advice
- High court
- Leases
- Local Court
- Magistrates Court
- Supreme Court
- Banking & Finance
- Construction Law
- Conveyancing
- General Advice
- Leases
- Mortgages


