New York attorney · Reg. #4757704

John Stephen MacKen, Iii

Registered (registry: Currently registered)

Current employer

Nasdaq · Rockville, MD · since at least September 2026

Admission

Admitted 2010, Second Department · CATHOLIC UNIVERSITY LAW SCHOOL

Employment history

• Nasdaq · Rockville, MD · current

Compiled from NYS Office of Court Administration registration records, published NY Appellate Division decisions, and SEC orders against attorneys; current as of October 2026. Not an official record; verify with the NY Courts Attorney Search.