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David Mark Mainzer

CRD# 2430050·Registered 1994 - 2017
Previously Registered: Being a previously registered professional could mean that David is no longer operating under the supervision of the SEC or FINRA. That means that the Securities and Exchange Commission may not be able to oversee the services that this specific professional is providing.

Professional Summary

David Mark Mainzer, who also goes by David Merk Mainzer, was a registered financial advisor. David was a previously registered financial professional and started their career in finance 1994 - 2017. David had worked at 7 firms and has passed the Series 63, SIE, Series 55, Series 7 and Series 24 exams.

At a Glance

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Fiduciary Standard

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Fee Structure

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Account Minimum

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Active Clients

Fiduciary Standard

Fee Structure

Account Minimum

Active Clients

Other Aliases

David Merk Mainzer

Blog Corner

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Videos & Posts

This advisor has not added any videos or posts yet.

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Contact Information

No current employment

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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

32 years in the financial services industry

Current & Past Employments

SIMPLEX TRADING, LLC·CRD# 153585
BD
Chicago, IL
August 31, 2016 - June 30, 2017
GLOBAL-AMERICAN INVESTMENTS, INC.·CRD# 41802
BD
Walnut, CA
August 8, 2014 - October 16, 2014
TITLE SECURITIES, INC.·CRD# 30057
BD
Chicago, IL
August 17, 2012 - September 4, 2012
TRADELINK SECURITIES, LLC·CRD# 131341
BD
Chicago, IL
September 29, 2004 - November 18, 2008
LIGHTSPEED PROFESSIONAL TRADING LLC·CRD# 39293
BD
New York, NY
May 22, 2003 - August 11, 2003
KNIGHT CAPITAL MARKETS LLC·CRD# 38379
BD
Purchase, NY
November 8, 1997 - March 21, 2003
TRADETECH SECURITIES L.P.·CRD# 31131
BD
Chicago, IL
September 13, 1994 - November 8, 1997
TITLE SECURITIES, INC.·CRD# 30057
BD
Chicago, IL
January 21, 1994 - December 5, 1994

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Current Firm

ST
SIMPLEX TRADING, LLC

MULTIPLEX TRADING LLC | SIMPLEX TRADING, LLC | SET TRADING PARTNERS, LLC

CRD#: 153585 / SEC#: 8-68556
BD
Broker-Dealer Firm Regulated by FINRA (Chicago district office)

Contact Information

Main Address

230 S. Lasalle Street Suite 08-500, Chicago, IL 60604

Mailing Address

230 S. Lasalle Street Suite 08-500, Chicago, IL 60604

Phone Number

(312) 360-2440

Established

Delaware since 02/22/2010

Firm Type

Limited Liability Company

Fiscal Year End

December

Firm Size

Small

Documents

Direct owners and executive officers

NamePositionCRD#
SIMPLEX HOLDCO, LLCMANAGING MEMBER, OWNER—
HAUFE, DAVID HARMONCHIEF TECHNOLOGY OFFICER5939783
KERLIN, DENNIS JOHNCHIEF COMPLIANCE OFFICER4757638
ROCKEY, JOAN KATHRYNCHIEF FINANCIAL OFFICER, FINOP4562343
SWANSON, ERIK THEODORECHIEF EXECUTIVE OFFICER5941677

Disclosures

Regulatory Event

4

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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 2003About the Series 63 exam

SIE — Securities Industry Essentials Examination

Passed Jun 2017About the SIE exam

Series 55 — Limited Representative-Equity Trader Exam

Passed Sep 1999

Series 7 — General Securities Representative Examination

Passed Jan 1994About the Series 7 exam

Series 24 — General Securities Principal Examination

Passed Jun 2004About the Series 24 exam

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CRS (Client Relationship Summary)

The CRS(Customer Relationship Summary) document is not provided.

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