SIEB · CIK 65596
What Siebert Financial Corp. told the SEC could break it.
Siebert's disclosures center on concentration and dependency. A single holder owns about 42% of its common stock, giving it significant sway over shareholder votes and leaving minority holders with limited control. The firm also leans on a few key people and, notably, does not even own the 'Muriel Siebert' and 'Siebert' name it operates under — a licensed-brand dependency. As a brokerage and advisory business, the rest of its register is financial and regulatory: a meaningful slice of revenue (margin interest, interest on client cash, money-market distribution fees) moves with interest rates, and its broker-dealers and adviser sit under heavy SEC/FINRA/CFTC oversight where violations could bring fines or loss of registration.
4 self-disclosed vulnerabilities, pulled from its own filings, each in the company’s words, with the source. This is the risk register almost nobody reads.
In its own words
What could break it.
Other disclosures
- concentrated ownership — one holder owns ~42% of common stockhigh
A single holder (Kennedy Cabot / Gebbia interests) owns ~42% of Siebert's common stock and has significant influence over shareholder votes, so minority shareholders have limited control and a large block could pressure the stock if sold.
“owns approximately 42% of our common stock as of December 31, 2025. As a result, they have significant influence on matters submitted to a vote of shareholders.”
SEC filing →As of 2026
Key person
- dependence on key personnel; does not own the 'Muriel Siebert/Siebert' brand namemedium
Siebert depends on key personnel whose loss could significantly harm the business, and it does not own the 'Muriel Siebert' and 'Siebert' name/trademark it operates under — a key-person and licensed-brand dependency.
“We are dependent upon our key personnel for our success and the loss of the services of any of these individuals could significantly harm our business, financial condition and operating results. We do not own the Muriel Siebert and Siebert n”
SEC filing →As of 2026
Liquidity & debt
- interest-rate sensitivity of margin and money-market distribution-fee revenuemedium
Siebert earns significant revenue from margin interest on client balances, interest on segregated cash/securities, and money-market distribution fees, so changes in interest rates directly affect a key revenue stream.
“We are exposed to market risk from changes in interest rates. Such changes in interest rates primarily impact revenue from interest, marketing, and distribution fees.”
SEC filing →As of 2026
Regulatory & policy
- broker-dealer/RIA regulation — SEC/FINRA/CFTC net capital, Advisers Act, AML/OFAC, ERISAlow
Siebert's broker-dealers (MSCO, RISE) and adviser (SNXT) are heavily regulated — SEC/FINRA/CFTC net-capital rules, the Advisers Act, AML/OFAC sanctions programs and ERISA fiduciary duties — and violations could bring fines, suspensions or registration revocation.
“If the SEC or other government agencies believe that SNXT has failed to comply with applicable laws or regulations, these agencies have the power to impose fines, suspensions of a registrant and individual employees or other sanctions, which could include revocation of SNXT's registration under the Advisers Act.”
SEC filing →As of 2026
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