Lona Nallengara


Lona focuses on advising companies, financial institutions and their boards on corporate governance, disclosure, and securities law compliance matters and on the financial regulatory process.

He also advises companies and financial institutions on all aspects of public and private offerings of equity, equity-linked, high yield debt and investment grade debt securities.

Prior to returning to the firm in 2017, Lona served in senior positions at the Securities and Exchange Commission for over four years. From 2013 to 2015, he served as Chief of Staff to SEC Chair Mary Jo White, where he was the top advisor to the Chair on all issues, including policy development, rulemaking, strategy and management.

During this time, he led the rulemaking and implementation efforts related to all mandates under the Dodd-Frank and JOBS Acts and directed the SEC’s asset management, market structure, public company disclosure effectiveness and private offering reform programs. He also served as the SEC deputy to the Financial Stability Oversight Council and was the primary SEC liaison with other financial regulators.

Lona joined the SEC in 2011 as Deputy Director of the Division of Corporation Finance and later became its Acting Director. In this role, he was responsible for the division’s overall activities and operations, including rulemaking, interpretive guidance and the public company filing review program. Following his SEC tenure, Lona joined Bridgewater Associates, LP, where he was the Chief Governance Officer and a senior advisor to founder Ray Dalio.

Lona first joined the firm in 1998 and became a partner in 2007.

Lona is the Head of the U.S. Public Company Advisory practice and a member of the Board of A&O Shearman.

Published Work

  • Nallengara, L. (2023) “New York State Finalizes Significant Amendment to Part 500 Cybersecurity Regulation,” American Bar Association



New York, 1999


B.A., University of Western Ontario, 1993
LL.B., Osgoode Hall Law School of York University, 1996
A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.