Siebert Financial Corp. (SIEB)
SIEB moved a median of -0.34% 30 minutes after news, and -0.29% by the close. How SIEB actually reacts to news — the realized, point-in-time move the market made, measured across 166 labeled events over the last three years with zero look-ahead.
SIEB’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 25% | 136 |
| 30-min | -0.34% | 32% | 158 |
| 60-min | -0.29% | 36% | 163 |
| to close | -0.29% | 37% | 164 |
| Middle 50% of SIEB reactions | -2.48% to +1.42% |
|---|---|
| Median reaction (30-min) | -0.34% |
| Measured reactions | 166 |
Half of all Siebert Financial Corp. news events land between -2.48% and +1.42% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when SIEB moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to SIEB's baseline. Nothing else.
Recent SIEB events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Gebbia Media Launches Pretty Money, a New Podcast, Breaking the Taboo Around Money | Press release | GlobeNewswire | +0.00% | -1.94% | |
| Form ARS SIEBERT FINANCIAL CORP For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -0.90% | +1.80% | |
| Form DEF 14A SIEBERT FINANCIAL CORP For: Nov 18 | SEC filing · Form DEF | SEC EDGAR | -0.90% | +1.80% | |
| Form DEFA14A SIEBERT FINANCIAL CORP | SEC filing · Form DEFA14A | SEC EDGAR | -0.90% | +1.80% | |
| Form 8-K SIEBERT FINANCIAL CORP For: Sep 22 | SEC filing · Form 8-K | SEC EDGAR | -0.95% | -1.39% | |
| Siebert Partners with tZERO to Give Access to Digital Securities to Its Customers | Press release | GlobeNewswire | -0.96% | +0.96% | |
| Unusual Whales and Siebert Financial Announce Strategic Partnership to Launch New Series of ETFs | Press release | GlobeNewswire | -6.54% | -4.67% | |
| Siebert Financial Expands Strategic Partnership with FusionIQ Through Additional Investment and Long-Term Transformation Agreement | Press release | GlobeNewswire | -1.55% | +0.00% | |
| Form 10-Q SIEBERT FINANCIAL CORP For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -3.02% | -4.95% | |
| Siebert Reports Second Quarter 2026 Financial Results | Press release | GlobeNewswire | -3.02% | -4.95% | |
| Siebert Financial partners with Kakao Pay Securities to Launch Trading of 24-hr Tokenized Korean Stocks | Press release | GlobeNewswire | +0.01% | -2.35% | |
| Siebert Expands Access to Tokenized Securities Through New Collaboration with tZERO and Streamex | Press release | GlobeNewswire | — | +1.50% | |
| Siebert and Voices For Children Launch Financial Empowerment Initiative for Foster Youth in Miami-Dade | Press release | GlobeNewswire | +0.00% | +1.10% | |
| Form 10-Q SIEBERT FINANCIAL CORP For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.00% | -2.29% | |
| Siebert Reports First Quarter 2026 Financial Results | Press release | GlobeNewswire | +0.00% | -2.29% | |
| Form 10-K SIEBERT FINANCIAL CORP For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.00% | +0.52% | |
| Siebert Reports 2025 Financial Results | Press release | GlobeNewswire | +0.00% | +0.52% | |
| Siebert Financial and Newsmax Expand Strategic Partnership Through Financial Programming and National Advertising Campaign | Press release | GlobeNewswire | +0.00% | -1.01% | |
| Gebbia Media’s Tactical Wealth Launches on Newsmax 2, Highlighting Veteran Entrepreneurs, creating booming American Businesses | Press release | GlobeNewswire | +0.00% | +0.00% | |
| Siebert Financial and Kakao Pay Securities Expand Strategic Collaboration to deliver Daily U.S. Market Insights to 8 Million Korean Investors | Press release | GlobeNewswire | +0.00% | +0.33% | |
| Form S-8 SIEBERT FINANCIAL CORP | SEC filing · Form S-8 | SEC EDGAR | — | -2.29% | |
| Form 8-K SIEBERT FINANCIAL CORP For: Nov 18 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +0.00% | |
| Siebert Launches Siebert.Pro for Active, Self-Directed Investors | Press release | GlobeNewswire | +0.00% | +1.09% | |
| Form 10-Q SIEBERT FINANCIAL CORP For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -2.11% | — | |
| Siebert Reports Third Quarter 2025 Financial Results | Press release | GlobeNewswire | -2.11% | — | |
| Siebert Financial Corp. Announces Strategic Partnership with the Academy Veteran Bond ETF (VETZ) to Expand Veteran-Focused Financial Solutions and Education | Press release | GlobeNewswire | +3.54% | +0.74% | |
| Form 8-K SIEBERT FINANCIAL CORP For: Oct 28 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -2.13% | |
| Siebert Financial Opens Washington, D.C. Office To Advance Capital Markets And Investment Banking | Press release | GlobeNewswire | -1.29% | -6.15% | |
| Form ARS SIEBERT FINANCIAL CORP For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -0.61% | +0.00% | |
| Form DEF 14A SIEBERT FINANCIAL CORP For: Nov 18 | SEC filing · Form DEF | SEC EDGAR | — | +0.00% | |
| Form DEFA14A SIEBERT FINANCIAL CORP | SEC filing · Form DEFA14A | SEC EDGAR | -0.61% | +0.00% | |
| Siebert Financial Corp. and Next Securities forge Strategic Agreement to accelerate AI-powered Next-Gen Investor Solutions | Press release | GlobeNewswire | -3.41% | -2.39% | |
| Siebert Financial Launches Digital Assets Research, Hiring Brian P. Vieten as Research Analyst | Press release | GlobeNewswire | +4.12% | -0.38% | |
| Siebert Financial Appoints Daniel M. Ondeck as Head of Institutional Sales | Press release | GlobeNewswire | -6.18% | -1.93% | |
| Siebert Financial Corp. and Kakao Pay Securities Advance Partnership to Expand International Market Access | Press release | GlobeNewswire | +2.23% | +5.27% | |
| Form 10-Q SIEBERT FINANCIAL CORP For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -4.25% | -0.73% | |
| Siebert Reports Second Quarter 2025 Financial Results | Press release | Business Wire | -4.25% | -0.73% | |
| Siebert Financial Launches “Generation Wealth” Campaign to Reframe Investing for Gen Z | Press release | GlobeNewswire | +0.00% | +4.97% | |
| Siebert Financial Joins Russell 2000 Index, Strengthens Growth Strategy with Tech Investments | Press release | GlobeNewswire | -0.23% | -2.28% | |
| Form 8-K SIEBERT FINANCIAL CORP For: Jun 27 | SEC filing · Form 8-K | SEC EDGAR | -2.69% | -8.68% | |
| Gebbia Media Launches Tactical Wealth Podcast for the Military and Veteran Community | Press release | GlobeNewswire | -0.94% | +1.87% | |
| Gebbia Media Launches New Sports Division, Expanding Support for Elite Athletes Beyond the Game | Press release | GlobeNewswire | +6.00% | +1.78% | |
| Siebert Financial Deepens Tech Strategy with FusionIQ Investment | Press release | GlobeNewswire | +0.19% | -1.16% | |
| Form EFFECT SIEBERT FINANCIAL CORP | SEC filing · Form EFFECT | SEC EDGAR | +1.14% | -1.89% | |
| Siebert Financial Announces $100 Million Shelf Registration to Invest in Digital Assets, AI Technologies, and Potential Strategic Acquisitions | Press release | GlobeNewswire | -1.13% | -0.57% | |
| Form S-3 SIEBERT FINANCIAL CORP | SEC filing · Form S-3 | SEC EDGAR | -3.09% | -2.36% | |
| Gebbia Media Acquires Big Machine Rock, Expanding Investment in Rock Music | Press release | PR Newswire | +0.00% | +0.96% | |
| Siebert Financial Corp. Announces Preliminary Inclusion in the Russell Index | Press release | GlobeNewswire | -0.43% | +1.92% | |
| Form 10-Q SIEBERT FINANCIAL CORP For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.25% | -9.52% | |
| Siebert Reports First Quarter 2025 Financial Results | Press release | Business Wire | +0.25% | -9.52% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the SIEB section they belong to.
Where else SIEB is measured.
SIEB earnings → · Analyst actions → · SEC filings →
Other Financial Services names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| NUVEEN TX QUALITY MUNI INCOME FUND (NTX) | 166 | 0.00% | 46% |
| NUVEEN MI QUALITY INCOME MUNI (NUM) | 166 | 0.00% | 49% |
| SWK Holdings Corporation (SWKH) | 166 | +0.28% | 59% |
| BLACKROCK MUNI-BOND COMMON (BBK) | 164 | 0.00% | 35% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Financial Services names, measured the same way →
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Browse all tickers
Every name we’ve measured, in one place.
How the numbers are made.
How is Siebert Financial Corp.'s median reaction calculated?
Every labeled SIEB news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 166 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 32% of SIEB's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does SIEB's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.