SEC-registered wealth management firm Broker-dealer affiliated
Mack Investment Securities, Inc.
As of its Form ADV filed March 31, 2026, Mack Investment Securities, Inc., an SEC-registered, broker-dealer affiliated wealth management firm in Northfield, Illinois, reported $302.6 million in regulatory assets under management across 1,017 accounts, ranking #185 among all wealth firms in Illinois by assets.
Registration
- Main office
- Northfield, IL
- Registration
- SEC-registered, Approved
- CRD number
- 17643
- SEC file number
- 801-29570
- Registered since
- May 28, 1987
- Latest Form ADV filing
- March 31, 2026
- Organized as
- Corporation
- Fiscal year ends
- December
- Other offices
- 1
Key figures
- Regulatory assets under management
- $302.6 million
- Discretionary
- $214.6 million (70.9%)
- Non-discretionary
- $87.9 million
- Accounts
- 1,017 (729 discretionary)
- Clients
- 673, approximate as reported
- Employees
- 8
- Advisory staff
- 8 performing investment advisory functions
- Average account
- $297,532
- Asset growth, 1 year
- 14.8% (from $263.5 million a year earlier)
- Asset growth, 3-year annual rate
- 14.1% (from $203.5 million three years earlier)
- Asset growth, 5-year annual rate
- 10.2% (from $186.3 million five years earlier)
- Client growth, 1 year
- -0.4% (from 676)
Broker-dealer affiliated. The firm is itself a broker-dealer as well as an investment adviser (Form ADV Item 6.A(1)). It is ranked among all wealth firms, the directory's view that includes wirehouses and broker-dealer firms, not in the main lists of independent RIAs. How firms are classed.
Growth rates come from the SEC's yearly snapshots and are left blank when the years are not comparable.
Rankings
Among all wealth firms, including wirehouses and broker-dealer firms.
Assets over time
Data table
| As of | RAUM |
|---|---|
| October 1, 2010 | $81.2 million |
| October 3, 2011 | $88.1 million |
| October 1, 2012 | $99.4 million |
| October 1, 2013 | $112.7 million |
| October 1, 2014 | $122.6 million |
| October 1, 2015 | $133.6 million |
| October 3, 2016 | $125.3 million |
| October 2, 2017 | $143.2 million |
| October 1, 2018 | $165.2 million |
| October 1, 2019 | $163.5 million |
| October 1, 2020 | $186.3 million |
| October 4, 2021 | $186.3 million |
| October 3, 2022 | $200.7 million |
| October 5, 2023 | $203.5 million |
| October 1, 2024 | $221.7 million |
| September 2, 2025 | $263.5 million |
| October 2, 2026 | $302.6 million |
Clients and services
Client mix
| Measure | Bar | RAUM |
|---|---|---|
| High net worth individuals 282 clients | $230.8 million | |
| Individuals (other than high net worth) 379 clients | $65.0 million | |
| Pension and profit sharing plans 12 clients | $6.8 million |
How the firm is paid
- A percentage of assets under management
- Hourly charges
- Fixed fees
- Commissions
Advisory services
- Financial planning
- Portfolio management for individuals or small businesses
- Selection of other advisers
- Publication of periodicals or newsletters
- Market timing services
Financial planning clients (Item 5.H): 251-500.
Wrap fee program sponsor or portfolio manager: no.
Other business, affiliations and custody
Other business activities (Item 6.A)
- Broker-dealer
- Insurance broker or agent
Financial industry affiliations (Item 7.A)
- Other investment adviser
Custody (Item 9)
The firm reported no custody of client cash or securities.
Investment adviser representatives
- IARs registered with the firm
- 8
- Also registered through a broker-dealer
- 8
- Employees who are IARs (Form ADV 5.B(3))
- 6
Designations held by the firm's IARs: CFP 5.
8 of the firm's 8 IARs are registered in jurisdictions that require IAR CE. IAR CE requirements by state.
Counts only. AdvisorIQ does not list individual people.
Disclosures
On Form ADV Item 11 the firm answered yes to 0 disclosure questions. See the detail on IAPD.
Succession and acquired firms
On Form ADV Item 4 the firm did not report succeeding to another adviser's business.
Similar-sized firms in Illinois
| Firm | City | RAUM |
|---|---|---|
| Wellment Financial | Elmhurst | $312.7 million |
| Monere Wealth Management, Inc. | Schaumburg | $312.0 million |
| Vital Wealth Management, LLC | Rosemont | $300.8 million |
| Fiduciary Financial Partners, LLC | Naperville | $293.3 million |
| The Planning Group | Northfield | $291.5 million |
The five wealth firms, broker-dealer affiliated firms included, nearest in regulatory assets with a main office in the same state.
Elsewhere
- Mack Investment Securities, Inc. on IAPD: Form ADV, brochures and disclosure detail.
- Firm website: www.macktracks.com
- Wealth management firms in Illinois
Firm data as of October 2, 2026, from ia100226.zip. Figures are as the firm reported them; corrections are made on Form ADV and appear after the next monthly reload.
Data as of October 2, 2026, from Form ADV. Sources: SEC registered adviser data (ia100226.zip) and IAPD compilation reports. How the directory is built.