Biggest Small-Cap Gaps August 13, 2026: Float and Dilution Sourced

Direct answer: On August 13, 2026, six US small-caps recorded intraday gaps exceeding 40%. XHG led with +690% intraday (51.55M float), followed by FGI at +321% (1.93M float). Float—the number of shares available to the public—plays a mechanical role: the lower it is, the more a given volume can move the price. All these figures are dated and readable in SEC filings (10-K, 10-Q, 13D/G).

A session of extreme volatility

August 13, 2026 saw several US small-caps post intraday price swings exceeding 100%. Some crossed 600%. These spectacular moves aren't random. They reflect a precise mechanism where float (the number of freely tradable shares) meets concentrated buying volume.

When float is low—a few million shares or less—even modest buying flow can absorb all available supply. The price rises until a new equilibrium is found. On a gapping small-cap, that equilibrium can be 200% or 300% higher than the previous close.

This recap presents the six largest moves of the day. For each: the gap (opening distance from prior close), the intraday high, the float (dated and sourced), and the closing price. No fundamental catalyst is established here. We focus on what's measurable—the float, any recent dilution, the Short Sale Restriction (SSR)—and where to read this data in official filings.

The six biggest gaps of August 13, 2026

Ticker	Company	Opening gap	Intraday high	Float (M)	Closing price
XHG	XChange TEC.INC	+534%	+690%	51.55	$4.1005
FGI	FGI Industries Ltd.	+79%	+321%	1.93	$11.7194
DFSC	DEFSEC Technologies Inc.	+108%	+188%	2.67	$2.30
OFAL	OFA Group	+87%	+122%	2.64	$1.62
GXAI	Gaxos.ai Inc.	+50%	+79%	10.74	$1.26
ARX	Accelerant Holdings	+44%	+47%	218.20	$19.51

XHG opened up 534% from the previous close. The intraday peak: +690%. Float of 51.55 million shares. FGI gapped 79% and hit a high of +321% with a float of only 1.93 million—one of the lowest on this list.

DFSC opened at +108% and peaked at +188% (2.67 million float). OFAL gapped +87%, high of +122%. GXAI opened at +50% then touched +79%. All four tickers show floats below 11 million.

Only ARX exceeds 200 million float, with a relatively modest move: +44% at the open, +47% at the high.

These figures show a clear correlation. The lower the float, the larger the potential amplitude for a given volume. This isn't an absolute rule—other factors matter (pre-market liquidity, order book depth, market-maker presence)—but float remains the primary mechanical indicator of potential volatility.

The role of float: supply and demand mechanics

Float (or "public float") is the number of a company's shares available for public trading. It's calculated by subtracting from total outstanding shares the blocks held by insiders, founders, locked institutional investors, and any contractual restrictions.

You read this figure in SEC forms. The 10-K and 10-Q give outstanding shares. Schedule 13D and 13G detail large blocks. S-1 or S-3 prospectuses indicate new issuances.

When float is low—say, under 5 million shares—and sudden buying volume enters the market (a forum alert, a technical signal, a rumor), buyers must "chase" available shares. Each potential seller raises their offer price. The price can double, triple, or more in minutes. It's an accelerated auction mechanism, not a judgment on the company's intrinsic value.

Mechanical example: 2 million float, one million shares bought in an hour. Half the available supply changes hands. If potential sellers are scarce (insiders who don't sell, long-term investors), the price must rise until a seller is tempted. This process can produce +100% or +200% moves without any fundamental change having occurred.

Dilution and updating the float

Float isn't fixed. Every time a company issues new shares—a capital raise via S-3 prospectus, warrant exercises, debt-to-equity conversions—the float increases. This dilution mechanically reduces each existing shareholder's ownership percentage. Available supply increases, which can slow or reverse an upward move.

Low-cap small-caps regularly raise money to fund operations (cash burn). A company burning $1 million per quarter with $2 million in cash will need to issue new shares within months. Each issuance appears in an SEC filing: 424B5 form for a final prospectus, 8-K for the announcement. The float changes.

FloatVerify dates every float figure and displays divergences between sources instead of presenting a single "official" number. Why? Multiple SEC sources can give different numbers depending on filing date or inclusion of certain blocks.

For the six tickers listed above, the float shown is what was known at the time of the August 13, 2026 session. If any of these companies dilute in the following days, the real float will be higher. An identical volume move will produce a smaller price effect.

The Short Sale Restriction (SSR) and its impact

Several of these tickers likely triggered the Short Sale Restriction (SSR, Reg SHO Rule 201) during the session or a prior session. The SSR activates automatically when a stock loses 10% or more from the previous close. Once triggered, it remains in effect through the end of the next day. It prohibits short sales at a price below the best displayed bid.

In practice? Shorts can't "hit the bid" to quickly push the price down. They must wait for a buyer to lift the bid. This slows downward pressure. The SSR doesn't block short selling itself, but it makes the strategy less aggressive.

On low-float tickers in the middle of a run, the SSR can limit selling resistance and facilitate continuation of the upward move. It's not established here whether each ticker was under SSR at the time of its peak, but it's a frequent mechanical element on these types of moves. Traders consult real-time tools to know if a ticker is under SSR; the information is public and readable in market feeds.

Catalysts and absence of established information

No fundamental catalyst is provided in the data from this session. A +300% move can come from a contract announcement, an acquisition rumor, a social media signal, or simply a technical imbalance without underlying news.

FloatVerify doesn't speculate on reasons. The tool shows what's measurable—the float, dilution, cash burn, volume—and lets the investor cross-reference this data with other sources (press, SEC filings, forums).

What's certain: a +500% gap doesn't reflect a +500% change in fundamental valuation. It's a rapid price adjustment to an influx of buyers on limited float. These moves are often followed by reversals just as brutal. Once buying is exhausted, the price can drop 50% or more in hours. The volatility is symmetrical.

Recap

Point	Takeaway
Biggest gap	XHG: +690% intraday, +534% gap, 51.55M float
Lowest float	FGI: 1.93M, +321% intraday move
Role of float	Supply-demand mechanism: less float = more potential volatility
Dilution	Float changes with every share issuance (S-3, warrants, debt conversion)
SSR	Limits aggressive short selling; triggered at -10% and active through next day
Sources	10-K, 10-Q, 13D/G, S-1/S-3, 424B5, 8-K—all readable on SEC EDGAR

FAQ

What is a small-cap gap and why are these moves so significant?

A gap is the distance between the opening price and the previous close. On small-caps with tight float, concentrated buying volume meets few available shares, mechanically amplifying the price move. A gap of several hundred percent reflects this supply-demand imbalance, not necessarily a fundamental change in value.

Why is float so important for understanding these moves?

Float measures how many shares circulate freely (excluding insiders, locked blocks). Low float—a few million shares—means even modest buying volume can absorb all available supply and push the price higher. It's a dated figure, changed by every dilution or capital raise, readable in SEC filings.

Where do you find the official float for a small-cap stock?

Float is calculated from SEC forms: 10-K, 10-Q (outstanding shares), Schedule 13D/13G (blocks held by insiders or funds), S-1 or S-3 (new issuances). FloatVerify compiles these sources and dates every figure; when multiple sources diverge, the tool shows the range rather than one falsely certain number.

What does the SSR designation mean and what's its impact on trading?

The Short Sale Restriction (Reg SHO Rule 201) prohibits short sales at a price below the best bid when a stock has dropped 10% or more from the previous close. Triggered automatically, it remains active through the end of the next day, limiting aggressive downward pressure—without preventing short selling outright.

Are these +100% or larger moves buying opportunities?

FloatVerify gives no buy or sell advice. These moves reflect supply-demand imbalances, often followed by extreme volatility and rapid reversals. The tool shows the mechanics (float, dilution, volume), not future direction. Each investor must do their own risk analysis.

Sources

• SEC EDGAR—official filings database
• Forms 10-K and 10-Q (quarterly and annual reports, outstanding shares)
• Schedule 13D and 13G (disclosure of holdings exceeding 5%)
• Forms S-1 and S-3 (issuance prospectuses)
• Form 424B5 (final prospectus after issuance)
• Form 8-K (material events, including capital raises)
• Regulation SHO Rule 201 (SSR)

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.