Biggest Small-Cap Gaps September 22, 2026: Float and Dilution Sourced

Direct answer: On September 22, 2026, four US small-caps recorded dramatic opening gaps: GRML (+284% intraday peak, +45% gap, 158.85M share float), DCOY (+181% intraday, +101% gap, 0.66M float), QNME (+163% intraday, +106% gap, 34.43M float), and OPENZ (+131% intraday, +68% gap, 33.09M float). These moves illustrate the mechanical relationship between available float, volume traded, and intraday volatility on micro-caps. No catalyst is established in this recap; only measurable metrics are presented.

The gap: what actually measured on September 22

A gap is the spread between yesterday's close and today's open. When a stock opens well above (gap up) or below (gap down) its last trade, it signals an imbalance that formed off-hours. Pre-market, after-hours, or simply while the markets slept.

On September 22, 2026, four small-caps gapped more than 45% at the open:

Ticker	Opening gap	Float (M shares)	Price ($)	Volume (M shares)	Intraday peak
GRML	+45%	158.85	14.1236	76.5	+284%
DCOY	+101%	0.66	3.09	64.3	+181%
QNME	+106%	34.43	0.8643	53.4	+163%
OPENZ	+68%	33.09	0.0975	8.1	+131%

These figures are dated September 22, 2026 and sourced from the FloatVerify database. A small-cap's float can change in days — issuances, conversions, warrants exercised. Hence the systematic timestamping.

Low-float mechanics: 64 million shares traded on a 0.66 million share inventory

Float represents the number of shares actually available for public trading. You calculate it by subtracting from total outstanding shares those that are locked up: insiders, venture funds under restriction, blocks subject to lock-up clauses, shares bought back by the company (treasury stock).

DCOY (Decoy Therapeutics Inc.) showed a float of just 0.66 million shares on September 22. That day, 64.3 million shares changed hands. The theoretical float turned nearly 97 times. When a wave of buying must absorb or unload volumes 97 times the available inventory, each order pushes price further than it would on a wide-float stock.

A +101% opening gap doesn't necessarily reflect fundamental over- or undervaluation. It reflects a massive imbalance between available supply (0.66M shares) and demand expressed pre-market. Buyers willing to pay well above yesterday's close to obtain a scarce stock: the gap widens until a momentary equilibrium forms.

Greenland Mines Ltd. (GRML): wide float, record volume, absurd range

GRML showed a float of 158.85 million shares — 240 times DCOY's. Opening gap: +45%. Intraday peak: +284% versus the prior close.

With 76.5 million shares traded against a 158.85M float, float turnover was roughly 48% on the day. High, yes. Far from DCOY's 97 turns. Yet GRML's peak intraday gain (+284%) exceeded DCOY's (+181%).

Float isn't the only factor. Ownership structure matters. Order book depth matters. Halts (trading suspensions triggered by volatility) can concentrate action into narrow price bands. And catalysts — even ones not publicly identified — influence the ultimate range of a move. A wider float doesn't prevent dramatic moves if volume is sufficiently concentrated in time.

QNME and OPENZ: mid-range floats, triple-digit gaps

QNME (Quanome Technologies, Inc.) showed a float of 34.43M shares and opened with a +106% gap. Volume of 53.4 million shares represents 1.55 times the float — one complete turnover plus an extra chunk. Intraday peak: +163%.

OPENZ (Opendoor Technologies Inc Series Z Warrants) showed a float of 33.09M and gapped +68%, with volume of 8.1 million shares (roughly 24% of float). Intraday peak was +131%. This shows that relatively modest volume can generate a large gap if demand concentrates into a narrow pre-market price band.

Warrants add complexity. Their value depends on the underlying stock, the strike price (here $17.00 per OPEN common share), and expiration date. A warrant's volatility can exceed the underlying stock's when the market anticipates a move near the strike threshold.

Where to find float and why it goes stale fast

Float doesn't appear on a dedicated line in SEC filings. It's inferred from information in forms 10-K (annual), 10-Q (quarterly), S-1 (IPO), S-3 (securities offering), and Schedule 13D/G (stakes above 5%):

• Shares outstanding (total issued and in circulation)
• Insider ownership (shares held by officers, directors, affiliates)
• Restricted stock (shares subject to lock-up or vesting clauses)
• Treasury stock (shares repurchased by the company and removed from the market)

On an active small-cap, this calculation goes stale quickly. An ATM (At-The-Market) issuance, debt-to-equity conversion, warrant or option exercise, or a follow-on offering can dilute the float in days. A gap based on a float calculated a month ago may reflect a radically different reality than the current structure.

FloatVerify timestamps every float. A divergence between sources (source split) — for instance, when two aggregators show different floats for the same date — is surfaced instead of hidden under a single falsely certain figure.

Short Sale Restriction (SSR): what may or may not have applied

Regulation SHO Rule 201, also called the Short Sale Restriction (SSR), prohibits shorting a stock "at the market" or below the best bid when the price has dropped 10% or more from the previous close. The restriction stays active through the end of the following session.

On September 22, all four stocks opened gap up, ruling out an SSR trigger at the open. If any of them had later plunged 10% or more from the open (or from any higher intraday price taken as reference), SSR could have kicked in mid-session.

SSR activation limits downward pressure from opportunistic short sellers, but doesn't block already-open short positions or exempt market-makers. It can create a temporary cushion against selling cascades, but won't prevent declines if selling pressure comes from long shareholders.

Catalysts absent from this recap: cross-reference method

No specific catalyst (partnership announcement, patent filing, regulatory shift, financial release) is established in this recap for the four stocks. Data presented are limited to measurable metrics: float, opening gap, volume, intraday range.

Reliably identifying a catalyst requires methodical cross-referencing:

1. Timestamped SEC filings: search for 8-K forms (significant events), recent 10-Q/10-K, S-1/S-3 prospectuses, or Schedule 13D/G signaling a change of control.
2. Official press releases: check the issuer's site, regulated newswires (Newswire, PR Newswire, Business Wire).
3. Social media activity: track activity on specialized forums (StockTwits, Reddit r/pennystocks), Twitter hashtags, Discord channels dedicated to small-caps.
4. Regulatory halts: consult the trading halt list published by NASDAQ or NYSE to verify if the stock was suspended (code T1 = news pending, code LUDP/LULD = volatility halt).

A gap can occur without an identifiable public catalyst. Unconfirmed rumors, concentrated hedge fund buying, or simple social media effect amplified by low float. Absence of a documented catalyst doesn't disqualify the move; it simply signals that deeper investigative work would be required to establish a verifiable cause.

Recap

Point	Takeaway
Gaps measured	GRML +45%, DCOY +101%, QNME +106%, OPENZ +68% at the September 22, 2026 open
Float and turnover	DCOY, with 0.66M float, saw ~97x turnover. GRML (158.85M float) saw ~48%. Low float mechanically amplifies volatility at given volume
Where to read float	SEC filings (10-K, 10-Q, S-1, S-3, Schedule 13D/G); derived calculation (outstanding shares - insiders - restricted - treasury). Number goes stale fast (dilutions, conversions)
SSR	Restriction triggered if -10% from prior close; stays active through end of next day. None of the four stocks opened down on September 22
Catalysts	Not established in this recap. Identifying a reliable cause requires cross-referencing SEC filings, official releases, social activity, and regulatory halts
Intraday range vs gap	Gap measures the opening spread; peak intraday gain can be a multiple of the gap if the move continues intraday (GRML: +45% gap, +284% intraday peak)

FAQ

What is a gap on a small-cap and how does it form?

A gap is the spread between yesterday's close and today's open. On small-caps, gaps often form pre-market or at the regular open when new information (SEC filings, press releases, social activity) creates an imbalance between buyers and sellers before trading resumes. The smaller the float, the larger the gap can be at constant volume.

Why does a small-cap's float influence gap size?

Float represents the number of shares actually available for public trading (total issued minus locked or insider-held shares). A small float means fewer shares in circulation: at a given volume, buying or selling pressure must spread across fewer shares, mechanically amplifying the price move. That's why DCOY, with only 0.66M shares in the float, posted a +101% gap on 64 million shares traded.

Where do you find a small-cap's official float and how often does it update?

Float is calculated from SEC filings (forms 10-K, 10-Q, S-1, S-3, Schedule 13D/G). The number isn't directly published but derived from total outstanding shares minus known restrictions. It changes with every dilution (new share issuance, warrant conversions, option exercises) and can go stale in days on active micro-caps. FloatVerify timestamps every float to avoid calculations on outdated figures.

What is the Short Sale Restriction (SSR) and when does it apply?

The SSR (Regulation SHO Rule 201) limits short selling of a stock when its price has dropped 10% or more from the previous close. Once triggered, the restriction stays active through the end of the next trading day. This prevents short sellers from piling onto a stock in free fall, but doesn't affect already-open short positions or exempt market-makers.

Did the September 22, 2026 small-cap gaps have identified catalysts?

The data presented here focus on measurable metrics: float, volume, gap size. No specific catalyst (SEC filing, partnership, regulatory change) is established in this recap. Reliably identifying a catalyst requires cross-referencing EDGAR filing timestamps, official press releases, and social media activity — investigative work beyond the scope of a simple session recap.

Sources

• SEC EDGAR (official US regulatory filings database): sec.gov/edgar
• Regulation SHO Rule 201 (Short Sale Restriction): sec.gov/divisions/marketreg/rule201faq.htm
• Relevant SEC forms: 10-K (annual report), 10-Q (quarterly report), 8-K (significant events), S-1/S-3 (securities offerings), Schedule 13D/G (stakes above 5%)
• NASDAQ/NYSE trading halts (suspensions for volatility or pending news)
• FloatVerify database (sourced and dated float, dilution, cash burn)

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.