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RIA / WealthAdvisordual registered (broker-dealer)32 years in industry

Louis SIDEROPOULOS

Advisor at ALLIANCEBERNSTEIN L.P.

NEW YORK, NY

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Search this name across graphsid dfx:ria:62b43e8e-b4ff-aaa3-44e8-c24fa59304b3

Data as of Sep 14, 2026 (this record's last observation) from federal regulator filings. Page built Sep 19, 2026, 12:39 PM UTC and rebuilt at most every 15 minutes.

Relationships: 4
Dated events: 0
On other graphs: 0
Observed: Sep 19, 2005 to Sep 14, 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: ALLIANCEBERNSTEIN L.P.
Current firm class: other adviserderived
Book size: not publicno per-advisor AUM is published by the SEC, FINRA or IAPD, and DFX estimates none
Industry start: Jun 16, 1994earliest registration or exam on IAPD
Years in industry: 32derivedfrom the industry start date
Years at current firm: 8derivedfrom the current registration's begin date
Prior firms: 3
Current registrations: 1
Registered states: 1
Exams: S66|S63
First exam: Jun 16, 1994
First registration: Sep 19, 2005
Dual registered: yes, broker-dealer
Other names: LOU SIDEROPOULOS
IAPD individual key: 2474255

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
ALLIANCEBERNSTEIN L.P.	Other adviser	Dec 4, 2017	n/a	yes	NEW YORK, NY	Current employment
NATIONAL PLANNING CORPORATION ("NPC OF AMERICA" IN FL & NY)	Former SEC adviser	Jun 26, 2017	Sep 7, 2017	no	TARRYTOWN, NY	Previous registration
COLUMBIA MANAGEMENT INVESTMENT ADVISERS, LLC	Asset manager	May 1, 2010	Jul 30, 2015	no	MINNEAPOLIS, MN\|BOSTON, MA	Previous registration
BOFA ADVISORS, LLC	Former SEC adviser	Sep 19, 2005	May 7, 2010	no	BOSTON, MA	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
NATIONAL PLANNING CORPORATION ("NPC OF AMERICA" IN FL & NY)	ALLIANCEBERNSTEIN L.P.	Sep 7, 2017	Dec 4, 2017	88	Firm change	Other
COLUMBIA MANAGEMENT INVESTMENT ADVISERS, LLC	NATIONAL PLANNING CORPORATION ("NPC OF AMERICA" IN FL & NY)	Jul 30, 2015	Jun 26, 2017	697	Firm change after gap	Other
BOFA ADVISORS, LLC	COLUMBIA MANAGEMENT INVESTMENT ADVISERS, LLC	May 7, 2010	May 1, 2010	-6	Bulk transfer	Other

Relationships

Registered with (4)

→ ALLIANCEBERNSTEIN L.P.Registered adviserregistration: current employment
Dec 4, 2017 to presentfactForm ADV
→ NATIONAL PLANNING CORPORATION ("NPC OF AMERICA" IN FL & NY)Registered adviserregistration: previous registration
Jun 26, 2017 to Sep 7, 2017factForm ADV
→ COLUMBIA MANAGEMENT INVESTMENT ADVISERS, LLCRegistered adviserregistration: previous registration
May 1, 2010 to Jul 30, 2015factForm ADV
→ BOFA ADVISORS, LLCRegistered adviserregistration: previous registration
Sep 19, 2005 to May 7, 2010factForm ADV

Dated events

No dated event names this entity yet.