Jonathan Issan

Andrew Madgwick is Head of Digital Asset Technology at Marex, a role he assumed in January 2026. Prior to this appointment, he served as a Technologist in Capital Markets within Marex's engineering function from September 2024, before moving into the digital asset technology leadership position.

Before joining Marex, Madgwick held a series of technology delivery roles at MUFG spanning from March 2018 to October 2024. His tenure there included leading technology delivery for Brexit preparedness, covering middle, risk and back office systems and the creation of a new entity across system infrastructure. He subsequently led the IBOR Benchmark Reform programme as technology lead for securities, managing front and back book rollout onto RFR basis across linear and non-linear products, CCP transition events and regulatory reporting. He also led technology delivery for a Credit Risk Alignment and System Simplification project focused on enterprise system integration across credit risk exposure and SA-CVA, followed by CFTC Rewrite delivery and EMIR Re-write and Package Decomposition projects managing three parallel workstreams across two technology stacks. Between October 2023 and May 2024 he additionally held a Tech Lead role covering AI and machine learning exploration. His total professional experience spans 18 years. No educational background is referenced in the available source material.

Samuel Leyne is Director, Co-Head of Crypto Trading at Marex, based in Israel, a position he has held since April 2025. No further detail on his specific mandate at Marex has been disclosed publicly beyond that the role is currently being built out.

Prior to joining Marex, Leyne spent over six years at Enigma Securities, a regulated cryptocurrency liquidity provider. He served as Head of OTC Trading from April 2021 to October 2024, and before that as Head of Institutional Sales EMEA from January 2018 to August 2021. Earlier in his career, he worked as an Equity Trader at Makor Group. Between December 2015 and August 2018, he served as a combat soldier in the Golani Brigade of the Israel Defense Forces, completing an eight-month combat training programme. His total professional experience spans approximately eleven years.