# SIEBERT ADVISORNXT, LLC.

SIEBERT ADVISORNXT, LLC. of NEW YORK, NY is an SEC-registered investment adviser.

## Registration

- CRD: 288572
- Type: SEC-registered investment adviser
- SEC file number: 801-110718
- Location: 300 VESEY STREET, 5TH FLOOR, NEW YORK, NY, 10282
- Phone: 800-872-0444
- Latest filing: 2026-03-25
- Regulatory AUM: $391.5M
- Non-discretionary AUM: $391.5M
- Clients: 43
- Accounts: 973

## Business model

- Compensation: % of AUM
- Clients served: High net worth, Other

## Officers, owners & control persons (13)

| Name | Role | Location |
| --- | --- | --- |
| Mark Peter Malek | CHIEF INVESTMENT OFFICER | — |
| Andrew Henry Reich | CHIEF FINANCIAL OFFICER | — |
| Barbara Dunne Villella | CCO & AMLCO | — |
| Peter James Sosnowski | CEO/CHIEF OPERATING OFFICER | — |
| LOGUE ERNEST PATRICK | COUNSEL, CCO, AMLCO | — |
| REICH ANDREW HENRY | CFO; CHIEF FINANCIAL OFFICER | — |
| GEBBIA JOHN MICHAEL | CHIEF EXECUTIVE OFFICE; CHIEF EXECUTIVE OFFICER | — |
| O'LEARY GARTH ANDREW | CHIEF OPERATING OFFICER & DIRECTOR; COO; COO & DIRECTOR | — |
| SOSNOWSKI PETER JAMES | ACTING CHIEF OPERATING OFFICER; CEO/CHIEF OPERATING OFFICER | — |
| MALEK MARK PETER | CHIEF INVESTMENT OFFICER | — |
| BONO RONALD ROSS | CCO; CHIEF COMPLIANCE OFFICER | — |
| DEVITO JOHN PAUL | INVESTMENT COMMITTEE | — |
| VILLELLA BARBARA DUNNE | CCO & AMLCO | — |


## Related pages

- Form ADV Part 2 brochure: https://search.stillhousedata.com/firm/288572/brochure
- Similar advisers: https://search.stillhousedata.com/firm/288572/similar
- Related entities: https://search.stillhousedata.com/firm/288572/related
- SEC IAPD (source of record): https://adviserinfo.sec.gov/firm/summary/288572

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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.