Yen Sum has built a leading UK and European restructuring and finance practice, with more than 16 years of experience advising corporations, private equity sponsors, hedge funds and asset managers on restructuring, special situations and alternative and leveraged finance matters across the capital structure and credit spectrum. She also advises on M&A and buyouts acquisition finance and fund investments.

Yen is particularly focused on cross-border situations or those requiring new or innovative thinking and multifaceted solutions to be implemented across the capital structure. She has led or has been involved in a number of notable and high-profile transactions including those which have required negotiation, management and the balancing of various stakeholder groups and interests. These include alternative credit and other new money financings, bank/bond restructurings, schemes of arrangement, security enforcements, pre-packaged administrations, Chapter 11 and other corporate and insolvency tools, debt-for-equity swaps, restructuring involving derivative instruments and debt exchanges.

Prior to joining Sidley in 2017, Yen was a partner in the finance and restructuring practices of another international law firm. She also spent several years as a banking professional in Barclays Capital's Leveraged Finance business where she was involved in numerous buyouts, refinancings and recapitalizations.

Yen has received acknowledgement from numerous industry publications. The 2016 edition of Chambers UK states that "the 'phenomenal' Yen Sum continues to impress clients and peers alike. She focuses her practice on debt restructuring work, as well as credit fund investments and special situations financing matters. Clients include banks, asset managers and hedge funds." The 2017 edition of Chambers UK adds that she "advises the full range of stakeholders, and has earned particular renown for her work on cross-border matters. She is admired by clients for her practicality and ability to deliver 'very good, commercial advice.'"