Brett A. Sonzogni

SIEBERT ADVISORNXT, LLC.

New York, NY 10282

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CRD#: 6768295

Professional summary

Brett Andrew Sonzogni is a registered financial advisor currently at SIEBERT ADVISORNXT, LLC. located in New York, New York and MURIEL SIEBERT & CO., LLC located in New York, New York.

Brett is registered as an IAR (Investment Advisor Representative) and RR (Registered Representative) and started their career in finance in 2018. Brett has worked at 7 firms and has passed the Series 66, Series 57TO, SIE, Series 7 and Series 24 exams.

Question & Answer

Are you a "fiduciary"?

Yes

Aliases

None

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.

Blog Corner

CRS (Client Relationship Summary) - RIA

Click below to view Brett Andrew Sonzogni's CRS (Customer Relationship Summary).

CRS (Customer Relationship Summary)

Certified licenses

Advisors may have various certifications and credentials from different organizations. AdvisorCheck highlights these seven certifications - AIF®, CFP®, ChFC®, CFA, CLU®, CIMA®, CPWA®

None

Experience

Current

April 2, 2026 - Present

SIEBERT ADVISORNXT, LLC.

Office #1: 300 Vesey Street 5th Floor, New York, NY, 10282

RIA

CRD#: 288572

New York, NY

Current

April 2, 2026 - Present

MURIEL SIEBERT & CO., LLC

Office #1: 300 Vesey Street 5th Floor, New York, NY, 10282

CRD#: 5376

New York, NY

Past

April 18, 2025 - March 16, 2026

EMPOWER PRIVATE WEALTH

RIA

CRD#: 331529

Fort Lauderdale, FL

Past

February 24, 2025 - March 31, 2026

REVERE SECURITIES LLC

CRD#: 14178

NEW YORK, NY

Past

March 14, 2022 - December 31, 2022

B. RILEY WEALTH MANAGEMENT

RIA

CRD#: 2543

Boca Raton, FL

Past

March 8, 2022 - March 19, 2025

B. RILEY WEALTH MANAGEMENT

CRD#: 2543

Boca Raton, FL

Past

July 27, 2018 - March 19, 2025

B. RILEY WEALTH ADVISORS, INC.

RIA

CRD#: 115927

BOCA RATON, FL

Past

January 17, 2018 - July 22, 2022

NATIONAL SECURITIES CORPORATION

CRD#: 7569

BOCA RATON, FL

Primary Firm SEC Registration

This SEC-registered firm can serve clients nationwide. Some states may require the firm to submit a notice filing if the firm has more than 5 clients or a physical office there. You can view these state-level filings under the section titled "State Registrations and Notice Filings".

SIEBERT ADVISORNXT, LLC.

SIEBERT ADVISORNXT, INC. | SIEBERT ADVISORNXT, LLC.

CRD#: 288572 / SEC#: 801-110718

RIA

Registered Investment Advisory firm - (7/11/2017 Approved)

State Registrations and Notice Filings

Listed states reflect where the advisor is authorized to serve clients under state regulations.

IAR

means the advisor is registered as an Investment Advisor Representative in this state and is authorized to provide investment advice to clients there.

indicates the advisor is registered as a Registered Representative in this state, allowing them to offer securities such as stocks, bonds, and mutual funds through a broker-dealer.

Visual representation of state registrations

Arizona
(4/2/2026)

California
(4/2/2026)

Colorado
(4/2/2026)

Connecticut
(4/2/2026)

Florida
(4/2/2026)

IAR

Florida
(4/8/2026)

Georgia
(4/2/2026)

Illinois
(4/2/2026)

Indiana
(4/2/2026)

Maryland
(4/2/2026)

Massachusetts
(4/2/2026)

Nevada
(4/2/2026)

New Jersey
(4/2/2026)

New York
(4/2/2026)

IAR

New York
(4/2/2026)

North Carolina
(4/2/2026)

Ohio
(4/2/2026)

Oklahoma
(4/2/2026)

Pennsylvania
(4/2/2026)

Puerto Rico
(4/2/2026)

South Carolina
(4/2/2026)

Texas
(4/2/2026)

Virginia
(4/2/2026)

Wyoming
(4/2/2026)

Don't see your state listed? The advisor may still be able to work with you under the federal De Minimis Rule, which allows up to five investment advisory clients in a state without registration. Some states, like TX, LA, NE, and NH, may still require registration or notice filing. Contact the advisor or their firm to confirm their investment advisory availability in your state. Note: This rule does not apply to broker-dealer activity.

Exams

State Security Law Exam

IAR

Series 66

Date: 6/5/2018

Uniform Combined State Law Examination

General Industry/Product Exam

Series 57TO

Date: 1/12/2021

Securities Trader Exam

General Industry/Product Exam

SIE

Date: 10/1/2018

Securities Industry Essentials Examination

General Industry/Product Exam

Series 7

Date: 1/17/2018

General Securities Representative Examination

Principal/Supervisory Exam

Series 24

Date: 12/20/2018

General Securities Principal Examination

SRO Registrations

FINRA

SRO Registrations

NYSE American LLC

SRO Registrations

Nasdaq Stock Market

SRO Registrations

New York Stock Exchange

Current Firm

SIEBERT ADVISORNXT, LLC.

SIEBERT ADVISORNXT, INC. | SIEBERT ADVISORNXT, LLC.

CRD#: 288572 / SEC#: 801-110718

RIA

Registered Investment Advisory firm - (7/11/2017 Approved)

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Contact information

Main Address

300 Vesey Street 5th Floor, New York, NY, 10282

Mailing Address

653 Collins Avenue, Miami Beach, FL 33139

Phone number

(800) 872-0444

Established

Firm type

Fiscal year end

# of Employees

SEC notice filing (43 States and Territories)

Documents

Customer Relationship Summary (CRS / SEC)

Latest Form ADV

Part 2 Brochures

SIEBERT ADVISORNXT PART 2 BROCHURE MARCH 31, 2025 (3/31/2025)

Regulatory assets under management

Total Number of Accounts	786
AUM (Assets Under Management)	$ 287,623,668

Red Flags

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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Firm Stability Insights

Brett A. Sonzogni

Professional summary

Question & Answer

Aliases

Other business activities

Blog Corner

CRS (Client Relationship Summary) - RIA

Click below to view Brett Andrew Sonzogni's CRS (Customer Relationship Summary).

Certified licenses

Experience

SIEBERT ADVISORNXT, LLC.

MURIEL SIEBERT & CO., LLC

EMPOWER PRIVATE WEALTH

REVERE SECURITIES LLC

B. RILEY WEALTH MANAGEMENT

B. RILEY WEALTH MANAGEMENT

B. RILEY WEALTH ADVISORS, INC.

NATIONAL SECURITIES CORPORATION

Primary Firm SEC Registration

SIEBERT ADVISORNXT, LLC.

State Registrations and Notice Filings

Exams

Series 66

Date: 6/5/2018

Series 57TO

Date: 1/12/2021

SIE

Date: 10/1/2018

Series 7

Date: 1/17/2018

Series 24

Date: 12/20/2018

FINRA

NYSE American LLC

Nasdaq Stock Market

New York Stock Exchange

Current Firm

SIEBERT ADVISORNXT, LLC.

Contact information

SEC notice filing (43 States and Territories)

Documents

Part 2 Brochures

Regulatory assets under management

Red Flags

Company Information

SIEBERT ADVISORNXT, LLC.

TRUST BUT VERIFY

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