Siebert Financial names John M. Gebbia to board

John M. Gebbia’s appointment fills the board seat vacated by Gloria E. Gebbia; he has served as co-CEO of the company’s brokerage subsidiary.

Rhea-AI Filing Summary

On September 22, 2026, Gloria E. Gebbia resigned from SIEBERT FINANCIAL CORP.’s Board of Directors to focus on public relations and philanthropic endeavors. The company stated her resignation was not due to any disagreement with the company.

The board appointed John M. Gebbia to fill the vacancy. He has served as Co-Chief Executive Officer of subsidiary Muriel Siebert & Co., LLC, and has been active in the brokerage industry in various capacities since 1990. His board compensation will be consistent with that of the company’s other employee directors, as disclosed in the 2025 Form 10-K; related-party transactions involving him are also disclosed there.

8-K Event Classification

2 items: 5.02, 9.01

2 items

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers Governance

Key personnel changes including departures, elections, or appointments of directors and executive officers.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, or exhibit attachments filed with this report.

Key Figures

Board appointment date: September 22, 2026 Brokerage industry experience since: 1990 Fiscal year end: December 31, 2025

3 metrics

Board appointment date September 22, 2026 John M. Gebbia was appointed to the Board

Brokerage industry experience since 1990 John M. Gebbia’s industry experience

Fiscal year end December 31, 2025 Annual report referenced for director compensation and related-party transactions

Key Terms

employee directors, related party transactions

2 terms

employee directors technical

"consistent with the Company’s other employee directors"

related party transactions financial

"Any related party transactions between Mr. John M. Gebbia and the Company"

Transactions between a company and people or entities that have close ties to it—such as executives, board members, major shareholders, family members, or related companies—where the parties are not independent. These deals matter to investors because they can create conflicts of interest or hide favorable terms that distort a company’s true profits and risks; think of it like a business buying or selling to a family member instead of using the open market, which can lead to biased prices or undisclosed obligations.

FAQ

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Who joined SIEB’s board?

John M. Gebbia joined SIEBERT FINANCIAL CORP.’s Board of Directors on September 22, 2026, filling the vacancy resulting from Gloria E. Gebbia’s resignation. He has served as Co-Chief Executive Officer of subsidiary Muriel Siebert & Co., LLC, and has been active in the brokerage industry in various capacities since 1990.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 22, 2026

Siebert Financial Corp.

(Exact name of registrant as specified in its charter)

New York		0-5703		11-1796714
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification Number)

535 Fifth Avenue, 4th Floor, New York, NY		10017
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (212) 644-2400

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock - $0.01 par value		SIEB		The Nasdaq Capital Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On September 22, 2026, Gloria E. Gebbia, resigned from Siebert Financial Corp.’s (the “Company”) Board of Directors (the “Board”) to focus on public relations and philanthropic endeavors. Ms. Gebbia’s resignation from the Board was not due to any disagreement with the Company, and the Company extends its gratitude and appreciation to Ms. Gebbia for her contributions to the Company.

On September 22, 2026, the Board of Directors appointed John M. Gebbia to fill the vacancy resulting from Ms. Gebbia’s resignation.

Mr. John M. Gebbia has served as Co-Chief Executive Officer of Muriel Siebert & Co., LLC, a subsidiary of the Company, and has been active in the brokerage industry in various capacities since 1990. Mr. John M. Gebbia’s compensation for service on the Board will be consistent with the Company’s other employee directors as disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the Securities and Exchange Commission on March 30, 2026 (the “Form 10-K”). Any related party transactions between Mr. John M. Gebbia and the Company are disclosed in the Form 10-K.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits. The following exhibit is furnished with this Form 8-K.

Ex. No		Description of Exhibits
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

1

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Dated: September 25, 2026	SIEBERT FINANCIAL CORP.
	By	/s/ Andrew H. Reich
		Andrew H. Reich
		Executive Vice President, Chief Operating Officer, Chief Financial Officer, Secretary and Director (Principal executive, financial and accounting officer)

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Filing Exhibits & Attachments

3 documents

Other Documents

• EX-101 XBRL SCHEMA FILE 2.9 KB
• EX-101 XBRL LABEL FILE 33.4 KB
• EX-101 XBRL PRESENTATION FILE 21.8 KB