New York attorney · Reg. #4750519

William Charles Thum

Registered (registry: Currently registered)

Current employer

Sifma · Washington, DC · since at least September 2026

Admission

Admitted 2009, First Department · AMERICAN UNIVERSITY - WASHINGTON COLLEGE OF LAW

Employment history

• Sifma · Washington, DC · 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.