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RIA / WealthAdvisordual registered (broker-dealer)27 years in industry

THOMAS NELSON THIBEAULT

Advisor at WILLIAM BLAIR & COMPANY L.L.C.

PHOENIX, MD | BALTIMORE, MD | CHICAGO, IL

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Search this name across graphsid dfx:ria:b9f350df-ff18-5e2c-a073-553751d48853

Data as of Sep 15, 2026 (this record's last observation) from federal regulator filings. Page built Sep 21, 2026, 3:18 AM UTC and rebuilt at most every 15 minutes.

Relationships: 5
Dated events: 1
On other graphs: 0
Observed: Aug 23, 1999 to Sep 15, 2026

Across DFX

This entity has not been resolved onto another DFX graph by a shared identifier. A name match elsewhere would be a candidate, never an identity, and none is recorded.

Facts

fact = as filed or announced; derived = computed by DFX; estimate = a band, never a point

Current firm: WILLIAM BLAIR & COMPANY L.L.C.
Current firm class: broker-dealer affiliated wealth managerderived
Book size: not publicno per-advisor AUM is published by the SEC, FINRA or IAPD, and DFX estimates none
Industry start: Jul 13, 1999earliest registration or exam on IAPD
Years in industry: 27derivedfrom the industry start date
Years at current firm: 0derivedfrom the current registration's begin date
Prior firms: 4
Current registrations: 1
Registered states: 2
Exams: S65|S63
First exam: Jul 13, 1999
First registration: Aug 23, 1999
Dual registered: yes, broker-dealer
Other names: THOMAS THIBEAULT
IAPD individual key: 2101765

Registration history

registration spans on IAPD; the basis says whether the span is a current registration or a prior employment record

Firm	Class	Began	Ended	Current	Branch	Basis
WILLIAM BLAIR & COMPANY L.L.C.	Bd affiliated wealth	May 1, 2026	n/a	yes	PHOENIX, MD\|BALTIMORE, MD\|CHICAGO, IL\|CHICAGO, IL	Current employment
CHAPIN DAVIS ASSET MANAGEMENT	Independent wealth	Oct 16, 2009	May 1, 2026	no	BALTIMORE, MD\|BALTIMORE, MD\|BALTIMORE, MD	Previous registration
UBS FINANCIAL SERVICES INC.	Wirehouse	Dec 15, 2006	Oct 6, 2009	no	HUNT VALLEY, MD	Previous registration
MOUNT VERNON ASSOCIATES INC	Independent wealth	Nov 11, 2003	Nov 6, 2006	no	BALTIMORE, MD	Previous registration
DEUTSCHE BANK SECURITIES INC.	No RAUM reported	Aug 23, 1999	Jul 24, 2003	no	BALTIMORE, MD	Previous registration

Moves

a move is two registration dates; a bulk corporate re-registration is typed BULK_TRANSFER and is not a move

From	To	Left	Joined	Gap, days	Kind	Move type
CHAPIN DAVIS ASSET MANAGEMENT	WILLIAM BLAIR & COMPANY L.L.C.	May 1, 2026	May 1, 2026	0	Firm change	RIA to ibd
UBS FINANCIAL SERVICES INC.	CHAPIN DAVIS ASSET MANAGEMENT	Oct 6, 2009	Oct 16, 2009	10	Firm change	Other
MOUNT VERNON ASSOCIATES INC	UBS FINANCIAL SERVICES INC.	Nov 6, 2006	Dec 15, 2006	39	Firm change	Other
DEUTSCHE BANK SECURITIES INC.	MOUNT VERNON ASSOCIATES INC	Jul 24, 2003	Nov 11, 2003	110	Firm change	Other

Relationships

Registered with (5)

→ WILLIAM BLAIR & COMPANY L.L.C.Registered adviserregistration: current employment
May 1, 2026 to presentfactForm ADV
→ CHAPIN DAVIS ASSET MANAGEMENTRegistered adviserregistration: previous registration
Oct 16, 2009 to May 1, 2026factForm ADV
→ UBS FINANCIAL SERVICES INC.Registered adviserregistration: previous registration
Dec 15, 2006 to Oct 6, 2009factForm ADV
→ MOUNT VERNON ASSOCIATES INCRegistered adviserregistration: previous registration
Nov 11, 2003 to Nov 6, 2006factForm ADV
→ DEUTSCHE BANK SECURITIES INC.Registered adviserregistration: previous registration
Aug 23, 1999 to Jul 24, 2003factForm ADV

Dated events

Occurred
May 1, 2026
Advisor changed firm
Thomas Nelson Thibeault left Chapin Davis Asset Management for William Blair & Company L.L.C. (registered 2026-05-01)
Form ADVobserved 6 days ago