Mack Investment Securities, Inc.

Registered investment adviser · Northfield, IL · CRD #17643

Form ADV data as of 2026-09-01

Regulatory assets

$302.6 million

Total accounts

1,017

Employees

Disclosure events

Firm details

Website: http://www.macktracks.com
Telephone: 847-657-6600
SEC file number: 801-29570
Most recent Form ADV filing: 2026-03-31
SEC record: View this firm on the SEC's IAPD site

Disciplinary disclosures

This firm answered No to every Item 11 disciplinary question on its most recent Form ADV filing.

Assets and accounts

Provides continuous and regular supervisory or management services	Yes
Discretionary regulatory assets under management	$214.6 million
Non-discretionary regulatory assets under management	$87.9 million
Total regulatory assets under management	$302.6 million
Discretionary accounts	729
Non-discretionary accounts	288
Total accounts	1,017
Regulatory assets under management attributable to non-U.S. persons	$0

People

Total employees (excluding clerical)	8
Employees performing investment advisory functions (including research)	8
Employees who are registered representatives of a broker-dealer	8
Employees registered as investment adviser representatives with a state	6
Employees registered as IARs for another investment adviser	0
Employees who are licensed insurance agents	6
Firms or persons who solicit advisory clients on the firm's behalf	0

Custody

Has custody of client cash or bank accounts	No
Has custody of client securities	No
A related person has custody of client cash or bank accounts	No
A related person has custody of client securities	No
The firm acts as a qualified custodian	No
A related person acts as a qualified custodian	No

How the firm is compensated

A percentage of assets under managementHourly chargesFixed fees (other than subscription fees)Commissions

Advisory services offered

Financial planning servicesPortfolio management for individuals and/or small businessesSelection of other advisers (including private fund managers)Publication of periodicals or newslettersMarket timing services

Other business activities

Broker-dealer (registered or unregistered)Insurance broker or agent

Affiliated related persons

Other investment adviser (including financial planners)

Reported conflicts of interest

Form ADV Items 8 asks advisers to disclose arrangements that may create a conflict with client interests. This firm answered Yes to:

Buys or sells for itself securities it also recommends to clients
Recommends brokers or dealers to clients
Compensates a non-employee for client referrals

Client types

Type of client	Clients	Assets
Individuals (other than high net worth individuals)	379	$65.0 million
High net worth individuals	282	$230.8 million
Pension and profit sharing plans (not the participants or government plans)	12	$6.8 million