BrokerCheck Help Line (800) 289-9999    Schedule a Call
FINRA Home
at
in
in
By clicking the SEARCH button or otherwise using BrokerCheck, I agree to BrokerCheck Terms of Use
When communicating online or investing with any professional, make sure you know who you’re dealing with. Imposters might link to sites like BrokerCheck from phishing or similar scam websites, or through social media , trying to steal your personal information or your money. Please contact FINRA with any concerns.
Mark Anthony Kosir
CRD#: 2235482
IA
Investment Adviser
B
Broker Regulated by FINRA
BOK FINANCIAL SECURITIES, INC.CRD#: 17530 6036 South Yale
Tulsa, OK 74135
+1
Registration History
19952000200520102015202020252 FIRMS1993 - 1993 (<1 year)2 FIRMS2002 - Present (22 years)BTHE (WILSON) WILLIAMS FINANCIA... (CRD# 22704)1998 - 2002 (4 years)BNATIONSBANC INVESTMENTS, INC. (CRD# 16361)1998 - 1998 (<1 year)BNATIONSSECURITIES (CRD# 32542)1997 - 1998 (<1 year)BBOATMEN'S INVESTMENT SERVICES,... (CRD# 17533)1996 - 1997 (<1 year)BBANC IV INVESTMENTS, INC. (CRD# 36169)1994 - 1996 (2 years)BAMERICAN BROKERAGE SERVICES, INC. (CRD# 14650)1993 - 1994 (<1 year)BMIMLIC SALES CORPORATION (CRD# 15296)1992 - 1993 (<1 year)
License(s)

State Registrations

B
Alabama

B
Nevada

B
Arizona

B
New Mexico

B
Arkansas

B
New York

B
California

B
North Carolina

B
Colorado

B
Ohio

B
Florida

B
Oklahoma

B
Georgia

IA
Oklahoma

B
Hawaii

B
Oregon

B
Illinois

B
South Carolina

B
Indiana

B
South Dakota

B
Iowa

B
Tennessee

B
Kansas

B
Texas

B
Kentucky

B
Utah

B
Louisiana

B
Virginia

B
Maryland

B
Washington

B
Minnesota

B
Wisconsin

B
Missouri

B
Wyoming

B
Nebraska

SRO Registrations

Not all jurisdictions require IAR registration or may have an exemption from registration.
Current Registration(s)
B
BOK FINANCIAL SECURITIES, INC. (CRD#:17530)
6036 South Yale, Tulsa, OK 74135
Registered with this firm since 11/4/2002

IA
BOK FINANCIAL ADVISORS (CRD#:17530)
6036 South Yale, Tulsa, OK 74135
Registered with this firm since 11/6/2002

Previous Registration(s)
th hidden textth hidden textNameLocation
B
02/23/1998 - 11/19/2002 THE (WILSON) WILLIAMS FINANCIAL GROUP (CRD#:22704) DALLAS, TX
B
01/01/1998 - 02/24/1998 NATIONSBANC INVESTMENTS, INC. (CRD#:16361) BOSTON, MA
B
08/13/1997 - 01/01/1998 NATIONSSECURITIES (CRD#:32542)
B
09/03/1996 - 08/13/1997 BOATMEN'S INVESTMENT SERVICES, INC. (CRD#:17533) ST. LOUIS, MO
B
07/25/1994 - 09/03/1996 BANC IV INVESTMENTS, INC. (CRD#:36169)
B
10/07/1993 - 07/19/1994 AMERICAN BROKERAGE SERVICES, INC. (CRD#:14650) DETROIT, MI
B
03/01/1993 - 09/24/1993 AMERICAN EXPRESS FINANCIAL ADVISORS INC. (CRD#:6363) MINNEAPOLIS, MN
B
03/01/1993 - 09/24/1993 IDS LIFE INSURANCE COMPANY (CRD#:6321) MINNEAPOLIS, MN
B
06/01/1992 - 01/15/1993 MIMLIC SALES CORPORATION (CRD#:15296) ST. PAUL, MN
Additional Information

The content of this summary, and the available detailed report, is governed by FINRA Rule 8312, and is primarily based on information filed on uniform registration forms. Rule 8312, amendments to the rule and notices related to U.S. Securities and Exchange Commission approval orders, can be viewed here.

State regulators are governed by their public records laws (not FINRA Rule 8312), and may provide information not in BrokerCheck, including information no longer required to be reported or updated on uniform registration forms due, for example, to its age or final disposition. You may contact your state regulator to request this additional information.

Click here for more information about how to check on an investment professional.

B
Broker

A brokerage firm, also called a broker-dealer, is in the business of buying and selling securities – stocks, bonds, mutual funds, and certain other investment products – on behalf of its customer (as broker), for its own bank (dealer), or both.
Individuals who work for broker-dealers - the sales personnel are commonly referred to as brokers.

IA
Investment Adviser

An investment adviser is paid for providing advice about securities to clients. In addition, some investment advisers manage investment portfolios and offer financial planning services.
It is common for a financial professional to act as both a broker and an investment adviser. Because of this, we include investment advisers on BrokerCheck, and provide links to the SEC's Investment Adviser Public Disclosure (IAPD) website so you can research further.

PR
Previously Registered

A Previously Registered broker or brokerage firm is not currently licensed to act as a broker (buying and selling securities on behalf of customers) or as an investment adviser (providing advice about securities to clients). They may still be able to offer other investment-related services if properly licensed to do so. Click here to learn more.

Disclosures

Disclosures can be customer complaints or arbitrations, regulatory actions, employment terminations, bankruptcy filings and certain civil or criminal proceedings that they were a part of.

Use of the BrokerCheck site is subject to
BrokerCheck Terms of Use

©2025 FINRA, All Rights Reserved

FINRA is a registered trademark of the Financial Industry Regulatory Authority, Inc.