A&O Shearman offers a comprehensive capital markets service to corporate and sovereign clients as well as underwriting investment banks, with the group noted particularly for its sovereign finance work in Latin America. Jason Lehner divides his time between the firm’s Toronto and New York offices; he has considerable experience assisting Canadian companies in the mining, media, telecoms, energy, and retail sectors, among others, with US capital raisings. Ilir Mujalovic and Harald Halbhuber departed the team in February 2026.
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Profile

Work Department
Capital Markets
Position

Partner

Career

Jason is Managing Partner of Toronto and focuses on advising issuers and investment banks in a broad range of public and private capital markets transactions, including high yield debt issuances, leveraged buyouts and acquisition financings, cross-border securities offerings and liability management transactions.
Having worked in the firm's Toronto office for over 20 years, Jason has developed significant expertise helping Canadian companies raise money in the United States. He also advises U.S. and Canadian corporations with respect to corporate governance, spin offs and other general corporate matters. He has worked on transactions involving companies in a broad range of industries, including mining and metals, media and telecommunications, power and energy, general industrials, consumer retail and forest products.

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Testimonials

Collated independently by Legal 500 research team.

  • 'Tianwei Liu is one of the quickest associates I've worked with on deals. She is extremely helpful and responsive.'

    ‘The most responsive team we work with across deals - accessible at all times. There is significant industry knowledge that carries across teams regardless of the associates.'

Key clients

  • Banco Internacional del Perú S.A.A. Ecopetrol S.A. Republic of Chile BofA Securities, Inc. ENGIE Chile Deutsche Bank Securities HSBC Securities (USA) Inc. Empresa Nacional del Petróleo (Enap) Volcan Compañía Minera S.A.A. Credicorp Capital Sociedad Titulizadora S.A. Balanz Capital, Galicia Citigroup Global Markets Inc. J.P. Morgan Securities LLC Santander US Capital Markets LLC Banco Internacional del Perú S.A.A. BBVA Securities BCP Securities Latin Securities Agente de Valores UBS Securities Itau BBA USA Securities, Inc Santander SBS Trading TPCG Valores Province of British Columbia BNP PARIBAS CIBC Capital Markets Scotiabank The Bank of Nova Scotia Province of Ontario HSBC National Bank of Canada Financial Markets BMO Capital Markets, Societe Generale Wells Fargo Securities Morgan Stanley Barclays Credit Agricole CIB NatWest Markets TD Securities RBC Capital Markets Casgrain & Company Limited Desjardins Capital Markets Natixis Laurentian Bank Securites Noventiq T.S. Lines Limited The Republic of Indonesia NBN Co Macquarie Bank CIMIC Karoon Energy Aegon CVC Nationwide Building Society Evolution Mining Limited

Work highlights

Advised Ecopetrol S.A. in connection with its USD1.85 billion & USD1.75 billion note offerings.
Advised the underwriters on the financing, including EUR3.9bnequivalent loans and bonds supporting Zegona’s acquisition of Vodafone Spain.
Advised the Province of Ontario in connection with its public offering of USD3 billion of bonds.