# MACK INVESTMENT SECURITIES, INC.

MACK INVESTMENT SECURITIES, INC. of NORTHFIELD, IL is an SEC-registered investment adviser.

## Registration

- CRD: 17643
- Type: SEC-registered investment adviser
- SEC file number: 801-29570
- Location: 211 WAUKEGAN ROAD, STE 300, NORTHFIELD, IL, 60093
- Phone: 847-657-6600
- Latest filing: 2026-03-31
- Regulatory AUM: $302.6M
- Discretionary AUM: $214.6M
- Non-discretionary AUM: $87.9M
- Clients: 8
- Accounts: 1,017

## Business model

- Compensation: % of AUM, Hourly, Fixed, Commissions
- Clients served: Individuals, High net worth, Charities, Corporations

## Officers, owners & control persons (6)

| Name | Role | Location |
| --- | --- | --- |
| [Stephen Walter Mack](https://search.stillhousedata.com/person/711692) | TRUSTEE IS PRESIDENT AND CCO | — |
| [ANDERSON WILLIAM](https://search.stillhousedata.com/person/738358) | CCO | — |
| [MACK STEPHEN WALTER](https://search.stillhousedata.com/person/754632) | TRUSTEE IS PRESIDENT; TRUSTEE IS PRESIDENT AND CCO; TRUSTEE IS PRESIDENT/CHIEF COMPLIANCE OFFICER | — |
| [GJERTSEN EDWARD WALTER II](https://search.stillhousedata.com/person/754633) | VICE-PRESIDENT | — |
| [GJERTSEN EDWARD WALTER](https://search.stillhousedata.com/person/778233) | VICE-PRESIDENT | — |
| [PETRAITIS BRIAN JOSEPH](https://search.stillhousedata.com/person/864902) | CHIEF COMPLIANCE OFFICER | — |


## Related pages

- Form ADV Part 2 brochure: https://search.stillhousedata.com/firm/17643/brochure
- Similar advisers: https://search.stillhousedata.com/firm/17643/similar
- Related entities: https://search.stillhousedata.com/firm/17643/related
- SEC IAPD (source of record): https://adviserinfo.sec.gov/firm/summary/17643

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Source: public SEC Form ADV data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.