Adviser and broker representative · William Blair
Dennis A. Duff
CRD 5457171 · Chicago, IL
At a glance
Dennis A. Duff is an investment adviser representative with William Blair in Chicago, IL, according to the SEC’s Investment Adviser Public Disclosure records. The earliest registration on Dennis’s SEC record dates to 2011, about 15 years ago. Dennis is also registered as a broker representative.
Current advisory firm
- William BlairSince August 2011Chicago, IL · $64B in regulatory assets
SEC adviser record
- Registered since
- 2011 (15 years)
- Designations
- None on file
- Exams
- Series 63, Series 65
- Registered in
- 1 state
- Also a broker representative
- Yes
- Disclosures on record
- None
AtlasMembers
Dennis’s office, career and moves
Their branch office with the firm’s business phone and website, every registration on their SEC record with dates, their employment history and outside business. Atlas members see all of it.
- Branch office address, business phone and website
- Locked
- Previous firms, with start and end dates
- Locked
- Employment history
- Locked
- States they’re registered in
- Locked
- Outside business activities
- Locked
- When they joined their current firm, and their firm’s growth
- Locked
Free while Atlas launches: create a free account and confirm your email. Every figure comes from SEC filings.
Something wrong? Ask for a correction. Source: the SEC’s Investment Adviser Public Disclosure records, as of October 2026. The full record, including any disclosure details, is on the SEC’s adviser search and FINRA BrokerCheck.