Biggest Small-Cap Gaps September 23, 2026: Sourced Float & Dilution

Direct answer: On September 23, 2026, three small-caps posted major gaps: BENF (Beneficient Class A) +442% on the open (peak +491%), IPDN (Professional Diversity Network) +77% (peak +185%), and VTGN (Vistagen Therapeutics) +54% (peak +115%). Each showed relatively thin float (12.83M to 41.03M shares) and volume running several multiples of available float. Float data comes from each issuer's most recent SEC filings and is dated to the latest quarter or transaction.

September 23, 2026 session by the numbers

Three explosive moves marked the U.S. small-cap session on September 23. The gaps—spreads between prior close and opening print—all cleared 50%, accompanied by volume that turned over the float multiple times.

Symbol	Opening gap	Intraday peak	Float (M)	Close price	Volume
BENF	+442%	+491%	15.46	$2.87	115,154,567
IPDN	+77%	+185%	12.83	$5.38	8,081,816
VTGN	+54%	+115%	41.03	$0.3649	338,358,211

These float figures come straight from the latest forms filed with the SEC by each issuer (10-Q, 10-K, or prospectus). Float is the number of shares actually available for public trading. You exclude insider blocks, affiliates, and contractual restrictions (lock-ups, Rule 144). It's a dated figure: it moves with every dilution—ATM issuance, PIPE, warrant conversion, or debt conversion.

Moves of this magnitude automatically trigger SSR (Short Sale Restriction, Regulation SHO Rule 201). A drop of 10% or more from the prior close activates a short-sale restriction through the end of the following session. On heavy upside gaps, SSR only triggers if the stock then falls 10% intraday from the previous close.

BENF: 115 million shares traded on 15.46M float

Beneficient Class A (BENF) exploded. Gap of +442% on the open. Measured peak at +491%. Closed at $2.87 after volume of 115,154,567 shares.

The latest SEC filing puts float at 15.46M shares. The day's volume represents 7.45 times the float. In other words, the entire available share supply changed hands more than seven times during the session.

When volume runs several multiples of float, every imbalance between buy orders and sell orders moves price violently. There's only a limited number of shares in circulation. If sellers are scarce—or if they all panic at once—price adjusts brutally to find a counterparty.

The precise catalyst? Nothing in the raw data for the day. Recent 8-K filings, press releases, or prospectuses might contain a material announcement, ongoing dilution, or capital-structure change. But here we're documenting the measured move, not the origin.

IPDN: from +77% to +185% peak, float at 12.83M

Professional Diversity Network, Inc. (IPDN) opened with a +77% gap. The intraday peak hit +185% before a partial retracement. Closed at $5.38. Volume of 8,081,816 shares.

IPDN's declared float stands at 12.83M. Volume represents roughly 63% of float. That's substantial—a 63% turnover in a single session is rare for a small-cap—but well below the ratios of BENF or VTGN.

The initial +77% gap signals that buy orders at the open far exceeded available supply at the last print. The +185% peak shows the imbalance amplified during the session. With 12.83M float, a concentrated wave of buying over a few minutes pushes price up several tens of percent if sellers hold back or demand much higher prices.

Here too, no documented catalyst in the raw figures. The search for "why" runs through SEC filings, press releases, and corporate event calendars: regulatory approval, clinical results, restructuring, partnership.

VTGN: 338 million volume on 41 million float

Vistagen Therapeutics, Inc. (VTGN) opened with a +54% gap. Intraday peak at +115%. Closed at $0.3649. Volume of 338,358,211 shares—the highest of the three in absolute terms.

Declared float: 41.03M shares. The largest of this selection. Yet volume represents 8.25 times the float. More than 338 million shares traded while only 41 million were available for trading. Shares turned over an average of more than eight times during the day.

This kind of ultrafast rotation creates order-book chaos. Each share can be bought and resold multiple times within the same session. Market makers and high-frequency traders account for a significant portion of this churn. But it's the net imbalance between buyers and sellers that determines price direction.

Vistagen is a biotech. Moves of this type are often tied to clinical announcements—trial results, FDA approval, partnership—but nothing documented here. The move is a measured fact. The origin remains to be dug out via filings and releases.

Why float matters: supply and demand mechanics

Float is the number of shares actually available for public trading. You calculate it by subtracting from total shares outstanding all blocks held by insiders, affiliates, contractual restrictions (lock-ups, Rule 144), and restricted institutional holdings.

Where do you find these figures?

• Forms 10-Q and 10-K: "Capital Stock" section or notes on shares.
• Prospectuses and S-1/S-3: during public offerings, the prospectus shows float before and after the transaction.
• Form 8-K: material announcements (dilution via ATM, warrant conversion, etc.).

Float changes frequently. Every time a company issues new shares—at-the-market "ATM" offering, PIPE, convertible-debt conversion, warrant exercise—the float increases. A float read from a June 10-Q may be obsolete by September if the issuer diluted in between.

A low float mechanically amplifies price moves for a given volume. If 10 million shares are bought aggressively and the float is only 15 million, that represents two-thirds of the float absorbed. Price must rise to attract new sellers. Conversely, if the float is 200 million, 10 million in buys represents 5% of float—much lower impact.

That's why small-cap traders watch float closely. It determines "relative liquidity" and sensitivity to volume. A +400% gap on 15M float with 115M volume is mechanically coherent. The same gap on 500M float would be extraordinary and probably impossible without a major catalyst.

Dilution and dated figures: float is never static

Dilution is the increase in total shares outstanding, which reduces the ownership percentage of each existing shareholder. It comes from:

• ATM offerings (at-the-market): gradual sale of new shares into the market.
• PIPE (private investment in public equity): private placement with subsequent registration.
• Warrant conversion: warrant holders exercise their purchase right, creating new shares.
• Debt conversion: convertible bond transformed into shares.

Every dilutive transaction changes the float. A stock that raises $50M via ATM by issuing 20M new shares sees its float increase by 20M (absent lock-ups). Free or paid screeners often display floats dated several weeks back. Only SEC filings are authoritative.

FloatVerify tracks this source divergence. Two databases can display two different floats for the same ticker, simply because one has incorporated the latest 8-K and the other hasn't. The "source split"—showing multiple values instead of a single falsely certain figure—avoids basing a decision on stale data.

Recap

Point	Takeaway
Largest gap	BENF +442% on open, peak +491%, float 15.46M, volume 115M (7.45× float)
Second move	IPDN +77% gap, peak +185%, float 12.83M, volume 8M (0.63× float)
Third move	VTGN +54% gap, peak +115%, float 41.03M, volume 338M (8.25× float)
Key mechanism	Low float + high volume = amplified price moves (supply/demand imbalance on a limited number of shares)
Float data source	SEC forms (10-Q, 10-K, S-1, prospectus, 8-K); dated figures, change with every dilution
SSR	Triggered automatically on ≥10% drop; restricts shorts through end of following session
Dilution	Increases shares outstanding and float; every ATM, PIPE, warrant or debt conversion changes the figures

FAQ

Which stock gapped the most on September 23, 2026?

BENF (Beneficient Class A) posted the largest gap at +442% on the open, peaking intraday at +491%. The declared float was 15.46M shares and volume hit 115.15M—more than 7 times the float. This exceptionally high volume-to-float ratio mechanically explains the magnitude of the move.

What is float and where do you find it?

Float (or free float) is the number of shares available for public trading, excluding insider blocks and restricted holdings. You find it in SEC filings (10-Q, 10-K, S-1, prospectuses), and it changes with every dilution event or restriction lift. It's a dated figure, often stale in free screeners.

Why does low float amplify price moves?

With low float, the same buying or selling volume meets fewer available shares, which tends to move price faster. Volume that runs several times the float can create violent swings if supply or demand becomes unbalanced. It's a simple supply-and-demand mechanism on limited stock.

What is SSR and when does it trigger?

SSR (Short Sale Restriction, or alternative uptick rule) triggers automatically when a stock falls 10% or more from the prior close. It prohibits short sales except above the best bid and stays in effect through the end of the following session. The goal is to limit downward pressure during high volatility.

Does float data change often?

Yes. Every new share issuance (ATM, PIPE, warrant exercise, debt conversion) changes the float. Float figures are dated; a float read from a June 10-Q may be obsolete by September if the company diluted in between. That's why you always verify the date of the latest SEC filing.

Sources

• SEC EDGAR (official SEC filing database): sec.gov/edgar
• Forms 10-Q, 10-K: quarterly and annual reports containing shares outstanding and capital notes
• Forms S-1, S-3, prospectuses: public offering documents detailing float before and after dilution
• Form 8-K: material announcements (dilution, warrant conversion, etc.)
• Regulation SHO Rule 201 (SSR): SEC rule on short-sale restrictions, available at sec.gov
• Volume and price data: consolidated from public market feeds (Nasdaq, NYSE, OTC Markets)

All float data cited comes from the latest SEC filings available for each issuer as of September 23, 2026. Price and volume figures are from the September 23, 2026 trading session.

See the float, sourced and dated, on FloatVerify.

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FloatVerify shows the float, dilution and cash burn of US small-caps, every number sourced and dated — and surfaces divergences between sources ("source split") instead of one falsely certain figure.

Disclaimer: FloatVerify is a data tool, not an investment advisory service. Nothing here is a recommendation to buy or sell. Data, not advice.