JUNIOR PROFILE

Stephen Kosmin

UK Bar 2026

11KBW

Ranked in 5 practice areas

Data Protection

London (Bar)

4 years ranked

Financial Services

London (Bar)

3 years ranked

Public Procurement

London (Bar)

5 years ranked

Civil Liberties & Human Rights

London (Bar)

3 years ranked

Administrative & Public Law

London (Bar)

7 years ranked

Chambers Review

Provided by Chambers

UK Bar

Data Protection - London (Bar)

Band 2

Individual Editorial

Stephen Kosmin regularly acts for and against regulators in large data breach cases. He is also involved in cases considering the evolution of this area of law and its interface with developing technologies, such as facial recognition.

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Financial Services - London (Bar)

Band 3

Individual Editorial

Stephen Kosmin is a go-to senior junior for the Financial Ombudsman Service, which he often advises in the High Court in relation to jurisdictional challenges and judicial reviews. He also specialises in collective investment schemes, SIPPs and tax avoidance schemes.

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Public Procurement - London (Bar)

Band 3

Individual Editorial

Stephen Kosmin is a well-respected junior with demonstrable experience of acting in high-profile and high-value public procurement matters. He regularly advises clients in the transport and healthcare sectors and has experience of working with local authorities and central government.

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Civil Liberties & Human Rights - London (Bar)

Band 4

Individual Editorial

Stephen Kosmin has acted in numerous important judicial reviews and other challenges concerning human rights issues, such as privacy and access to welfare.

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Administrative & Public Law - London (Bar)

Band 4

Individual Editorial

Stephen Kosmin is regularly instructed to bring and defend major challenges on behalf of local authorities, regulators and government departments. He appears before the Court of Appeal and Administrative Court, and offers considerable expertise in judicial review claims in the financial regulatory space.

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Strengths

Provided by Chambers

Stephen is absolutely extraordinary. He is an expert, who is humble, thorough and charming.
Data ProtectionUK Bar
Stephen is calm and unflustered. He is sensible and a safe pair of hands.
Data ProtectionUK Bar
Stephen is meticulous and thorough. He is a very calm and methodical advocate.
Data ProtectionUK Bar
He does an excellent job distilling details and has a real understanding of regulators.
Financial ServicesUK Bar
Stephen Kosmin is calm under pressure and can be trusted with a really heavy case.
Public ProcurementUK Bar
Stephen Kosmin is an excellent barrister who is meticulous and thorough.
Public ProcurementUK Bar