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William Horn

CITIZENS JMP SECURITIES
BOSTON, MA
·CRD# 2234778·34 years experience

Professional Summary

William Horn, who also goes by Bill Canniff, William Canniff Horn III, is a registered financial advisor currently at CITIZENS JMP SECURITIES, LLC located in Boston, Massachusetts. William is registered as a RR (Registered Representative) and started their career in finance in 1992. William has worked at 7 firms and has passed the Series 63, Series 82TO, Series 22TO, Series 99TO, Series 7TO, SIE, Series 79, Series 7 and Series 24 exams.

At a Glance

Best-Interest Standard

Fiduciary Standard

Fee Structure

Account Minimum

Active Clients

Fiduciary Standard

Fee Structure

Account Minimum

Active Clients

Other Aliases

Bill Canniff, William Canniff Horn Iii

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Videos & Posts

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Contact Information

This advisor has not claimed their profile yet, so there is no contact information to display at this time.

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Disclosures are events reported to regulators, such as customer disputes, regulatory actions, employment separations, or financial events. Some are resolved, denied, or contested — a disclosure is not a verdict. We recommend asking an advisor directly about any disclosure on their record.

Disclosures on record.

Disclosures can be potential red flags, including customer disputes, regulatory fines, employer terminations, bankruptcies, judgments, liens, or certain criminal activities. Check for any disclosures as part of your thorough research when choosing an advisor.

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Years of Experience

34 years in the financial services industry

Current & Past Employments

CITIZENS JMP SECURITIES, LLC·CRD# 22208
BD
28 State Street 15th Floor, Boston, MA 02110
December 9, 2025 - Present
M&T SECURITIES, INC.·CRD# 17358
BD
Baltimore, MD
April 12, 2024 - July 14, 2025
CITIZENS JMP SECURITIES, LLC·CRD# 22208
BD
Boston, MA
August 1, 2023 - March 28, 2024
CITIZENS CAPITAL MARKETS·CRD# 277073
BD
Boston, MA
May 24, 2018 - August 1, 2023
STATE STREET GLOBAL ADVISORS FUNDS DISTRIBUTORS, LLC·CRD# 30107
BD
Boston, MA
August 28, 2002 - April 13, 2004
ONECORE SECURITIES, INC.·CRD# 45813
BD
Bedford, MA
October 4, 2000 - April 2, 2001
FIDELITY BROKERAGE SERVICES LLC·CRD# 7784
BD
Smithfield, RI
March 22, 1999 - July 14, 2000
NATIONAL FINANCIAL SERVICES LLC·CRD# 13041
BD
Boston, MA
July 20, 1992 - March 22, 1999

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Current Firm

CJ
CITIZENS JMP SECURITIES, LLC

CITIZENS | TRINITY CAPITAL | MITCHUM, JONES & TEMPLETON, INC. | MATRIX CAPITAL MARKETS GROUP | JOLSON MERCHANT PARTNERS | JMP SECURITIES LLC | JMP SECURITIES | DH CAPITAL | CITIZENS M&A ADVISORY | CITIZENS JMP SECURITIES, LLC | CITIZENS JMP | CITIZENS CAPITAL MARKETS & ADVISORY | CITIZENS CAPITAL MARKETS

CRD#: 22208 / SEC#: 8-39613
BD
Broker-Dealer Firm Regulated by FINRA (San Francisco district office)

Contact Information

Main Address

101 California Street Ste 1700, San Francisco, CA 94111

Mailing Address

101 California Street Ste 1700, San Francisco, CA 94111

Phone Number

(415) 835-8900

Established

Delaware since 01/01/2002

Firm Type

Limited Liability Company

Fiscal Year End

December

Firm Size

Medium

FINRA licenses (51 States and Territories)

Registered to provide investment advisory services in 0 US states and territories.

Documents

Customer Relationship Summary (CRS / FINRA)

Direct owners and executive officers

NamePositionCRD#
JMP HOLDING LLCPARENT COMPANY—
CONROY, WALTER IVORGENERAL COUNSEL6641487
GREGORY, JOHNPRESIDENT4600619
MCLAUGHLIN, BRENDANCHIEF COMPLIANCE OFFICER2562815
MUTHYALA, RAJIV THEOPHILUSCHIEF FINANCIAL OFFICER5404859
O'DAY, JAMES CORTLANDHEAD OF EQUITIES5618215
PITARRESI, JOHN CHARLESSENIOR REGISTERED OPTIONS PRINCIPAL (SROP)2064758
SLADER, GAVIN WILLEYHEAD OF INVESTMENT BANKING4130019
SPURR, JEFFREY HOLMESHEAD OF RESEARCH1384716
SUCHY, GREGORY JOHNCHIEF OPERATING OFFICER / PRINCIPAL OPERATIONS OFFICER5907019
WHITEHEAD, AIDAN PETERHEAD OF TRADING & SALES TRADING2474257
XIAO, ZHUO VIVIAN XUANFINOP5121578

Disclosures

Regulatory Event

6

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Other business activities

Outside business activity is any business or activity undertaken by an advisor that is outside the scope of their relationship with their firm (e.g., consulting services, real estate, freelance work, teaching, etc.). Investors should stay informed about these activities to ensure no conflicts of interest.

The advisor shows no other business activity.

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State Registrations and Notice Filings

Listed states reflect where the advisor is authorized to serve clients under state regulations.
This advisor is not registered in any state.

Exams

Financial professionals may take different exams throughout their careers based on the types of services they provide and roles they perform.

Series 63 — Uniform Securities Agent State Law Examination

Passed Jun 1992About the Series 63 exam

Series 82TO — Limited Representative-Private Securities Offerings

Passed Apr 2024About the Series 82TO exam

Series 22TO — Direct Participation Programs Representative Examination

Passed Jan 2023About the Series 22TO exam

Series 99TO — Operations Professional Examination

Passed Jan 2023About the Series 99TO exam

Series 7TO — General Securities Representative Examination

Passed Jun 2020About the Series 7TO exam

SIE — Securities Industry Essentials Examination

Passed Oct 2018About the SIE exam

Series 79 — Investment Banking Registered Representative Examination

Passed May 2018About the Series 79 exam

Series 7 — General Securities Representative Examination

Passed Jul 1992About the Series 7 exam

Series 24 — General Securities Principal Examination

Passed Mar 2019About the Series 24 exam
FINRA
SRO Registrations
Nasdaq Stock Market
SRO Registrations

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CRS (Client Relationship Summary) - BD

Click below to view William Horn's CRS (Customer Relationship Summary).

CRS (Customer Relationship Summary)

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