AdvisorCheck - Find and Connect with Top Financial Advisors on Your Terms
Advisor Search
Why Advisor Check

We're Here To Help

AdvisorCheck empowers you to find, evaluate, and monitor financial advisors with confidence and clarity.

Advisor Monitoring

Financial advisor's situations can change, sometimes without notice. AdvisorCheck's Monitoring tool helps you avoid surprises and stay on top of your financial health.

Firm Stability Insights

The stability of your financial advisor's firm has a significant impact in the security and quality of service you receive. Our tool provides historical data and key insights over time to help you make informed, confident decisions.

Pricing
For Advisors
WL

William C. Leitner

INSTITUTIONAL SECURITIES
Dallas, TX 75219
Some features on this profile are disabled
CRD#: 4314993
WL

Professional summary

William Cullen Leitner, who also goes by Bill Leitner, is a registered financial professional currently at INSTITUTIONAL SECURITIES CORPORATION located in Dallas, Texas.

William is registered as a RR (Registered Representative) and started their career in finance in 2005. William has worked at 1 firm and has passed the Series 63, SIE and Series 6 exams.

top-8-questions

Question & Answer

Are you a "fiduciary"?
No

Aliases

Bill Leitner

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.

Blog Corner

CRS (Client Relationship Summary) - BD

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

Certified licenses

Advisors may have various certifications and credentials from different organizations. AdvisorCheck highlights these seven certifications - AIF®, CFP®, ChFC®, CFA, CLU®, CIMA®, CPWA®
None

Experience

Current

March 21, 2005 - Present

INSTITUTIONAL SECURITIES CORPORATION

Office #1: 3500 Oak Lawn Ave Ste. 400, Dallas, TX 75219
BD
CRD#: 20291
Dallas, TX

State Registrations and Notice Filings

Listed states reflect where the advisor is authorized to serve clients under state regulations.

RR
indicates the advisor is registered as a Registered Representative in this state, allowing them to offer securities such as stocks, bonds, and mutual funds through a broker-dealer.

Visual representation of state registrations

RR
Arkansas
(12/10/2018)
RR
California
(1/17/2019)
RR
Colorado
(7/8/2025)
RR
Florida
(7/8/2025)
RR
Ohio
(7/8/2025)
RR
Oklahoma
(1/2/2014)
RR
Texas
(7/11/2005)
RR
Utah
(7/8/2025)

Exams

State Security Law Exam
RR
Series 63
Date: 7/8/2005
Uniform Securities Agent State Law Examination
General Industry/Product Exam
RR
SIE
Date: 10/1/2018
Securities Industry Essentials Examination
General Industry/Product Exam
RR
Series 6
Date: 3/18/2005
Investment Company Products/Variable Contracts Representative Examination
SRO Registrations
RR
FINRA

Current Firm

IS
INSTITUTIONAL SECURITIES CORPORATION
INSTITUTIONAL SECURITIES CORPORATION | ISC GROUP, INC.

CRD#: 20291 / SEC#: 801-36967, 8-38158

BD
Broker-Dealer Firm Regulated by FINRA (Dallas district office)
Upgrade to AdvisorCheck Premium
Get A Biweekly Pulse, AutomaticallyReceive biweekly alerts automatically. Stay informed and proactive.
Catch Firm-Level Red Flags SoonerCatch leadership changes and disclosures early, before issues escalate.
See Trends. Not Just SnapshotsMonitor firm stability metrics like AUM and advisor ratios over time.

Contact information

Main Address
3500 Oak Lawn Ave Suite 400, Dallas, TX 75219
Mailing Address
3500 Oak Lawn Ave Suite 400, Dallas, TX 75219
Phone number
(214) 520-1115
Established
Texas since 06/24/1987
Firm type
Corporation
Fiscal year end
December
Firm Size
Small
# of Employees

FINRA licenses (51 States and Territories)

Blank US states mapAlaskaHawaiiAlabamaArkansasArizonaCaliforniaColoradoConnecticutDelawareFloridaGeorgiaIowaIdahoIllinoisIndianaKansasKentuckyLouisianaMassachusettsMarylandMaineMichiganMinnesotaMissouriMississippiMontanaNorth CarolinaNorth DakotaNebraskaNew HampshireNew JerseyNew MexicoNevadaNew YorkOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVirginiaVermontWisconsinWest VirginiaWyoming

Documents

Customer Relationship Summary (CRS / FINRA)Latest Form ADV

Part 2 Brochures

Direct owners and executive officers

NamePositionCRD#
ISC GROUP, INC.OWNS APPLICANT
HAYES, SCOTT ALLENPRESIDENT2375916
NEIDLINGER, CHRISTOPHER WADECHIEF COMPLIANCE OFFICER2963179
STERLING, DONALD WILLIAMFINANCIAL OPERATIONS PRINCIPAL1192425

Disclosures

Regulatory Event1

Red Flags

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.

Company Information

INSTITUTIONAL SECURITIES CORPORATION

CRD#: 20291Dallas, TX 75219

TRUST BUT VERIFY

Monitor William Leitner

Get automatic monthly alerts on:
Job or Firm Moves
Licensing Changes
Client Complaints
New Red Flags
Contact Information Updates

Similar Advisors

David Antonio Alvarez
David AlvarezAdvisorCheck Check Mark
EDWARD JONES
IAR
RR
Grapevine, TX
Kenneth Bernard Hopkins
Kenneth HopkinsAdvisorCheck Check Mark
ORION WEALTH MANAGEMENT LLC
IAR
RR
Garland, TX
JM
Jonathan MeaneyAdvisorCheck Check Mark
RAYMOND JAMES FINANCIAL SERVICES ADVISORS, INC
IAR
RR
DALLAS, TX
footer-logo
How We Help
Advisor Search
Find Advisors by State
Blog
Glossary
For Advisors
About Us
Help Center
Terms Of UsePrivacy PolicySubscription Policy
AdvisorCheck does not offer investment advice and should not replace discussions with professional accounting, tax, legal or financial advisors.
© 2025 AdvisorCheck, an AIMR Analytics company.
All rights reserved.
Powered ByAIRM Analytics