Reverse splits, listing and halts
Reverse Stock Split Explained: How It Works
How a reverse stock split works, its stages and filings, fractional shares, ADS ratio changes, bid-price rules and Nasdaq's 250-to-1 cap.
What is a reverse stock split?
A reverse split combines several existing shares into one new share. In a 1-for-10 reverse split, every 10 old shares become 1 new share, and the share price is multiplied by roughly ten at the open on the effective date. The company's market value, your percentage ownership and the business itself are unchanged by the split alone.
Most reverse splits among small US-listed companies are about the share price, not the business. Nasdaq and NYSE American require a minimum bid price (on Nasdaq, $1.00), and a reverse split is the fastest way to lift a price back above it. Exchanges limit how often a company can rely on it, including Nasdaq's cumulative 250-to-1 cap over two years. The live list is the reverse split calendar.
How a reverse split works
On the market effective date, the old shares stop trading and the consolidated shares begin trading at the open. Broker accounts are adjusted automatically. Three things change:
- The share count falls by the split ratio.
- The price is adjusted up by the same ratio (before any trading moves it).
- The CUSIP, the nine-character identifier for the security, usually changes, because the old security has been replaced by a new one.
The ticker normally stays the same. Options contracts are adjusted by the Options Clearing Corporation rather than cancelled.
A worked example
Hypothetical Company X has 80,000,000 shares outstanding trading at $0.40, a market value of $32,000,000. It completes a 1-for-20 reverse split.
| Before | After 1-for-20 | |
|---|---|---|
| Shares outstanding | 80,000,000 | 4,000,000 |
| Price per share | $0.40 | $8.00 |
| Market value | $32,000,000 | $32,000,000 |
| A holder's shares | 10,050 | 502.5 |
| That holder's ownership | 0.0126% | 0.0126% |
All figures are hypothetical, before any trading on the effective date.
Run your own numbers, or several past splits for the cumulative ratio, in the reverse split calculator.
Reverse split vs forward split
A forward split is the same mechanic in the other direction: one share becomes several.
| Reverse split (1-for-10) | Forward split (10-for-1) | |
|---|---|---|
| Share count | Divided by 10 | Multiplied by 10 |
| Price per share | Multiplied by 10 | Divided by 10 |
| Market value and your % | Unchanged | Unchanged |
| Usual context | Lifting a low price above a listing minimum | Lowering a high per-share price |
Neither changes the company's cash, revenue or debts.
What happens to fractional shares
The holder in the table ends up with 502.5 shares. Most companies do not issue fractions, so the split terms state how they are handled:
- Cash in lieu. The fraction is paid out in cash, usually based on a price around the effective date. The holder keeps 502 shares and receives cash for 0.5 of a share.
- Rounding up. The fraction becomes a whole share, which slightly increases the post-split share count.
- Aggregation and sale. The transfer agent pools fractions, sells them and distributes the proceeds.
The method is spelled out in the proxy statement and in the company's announcement, often an 8-K.
The stages of a reverse split
Each stage leaves a filing. Not every split has every stage.
| Stage | Filing that marks it | Tab on the Reverse Splits page |
|---|---|---|
| Proposed | PRE 14A, then DEF 14A (a 6-K meeting notice for a foreign issuer) | Vote pending |
| Approved, no date yet | 8-K Item 5.07 vote result, a DEF 14C written consent, a 6-K, or an 8-K stating the board acted alone | Approved, no date |
| Effective date announced | 8-K Items 5.03 and 3.03, a 6-K or press release, then exchange notices | Upcoming |
| Effective | New shares trade at the open; the next 10-Q or 10-K restates share counts | Recently completed |
- Proposed. The proxy statement usually asks shareholders to approve a range of ratios, leaving the board to pick the final one.
- Approved. Item 5.07 reports the result within four business days after the meeting ends. Approval can also come by written consent; under Rule 14c-2(b) the information statement goes out at least 20 calendar days before the action takes effect. Nevada's NRS 78.207 lets the board act alone when authorized and outstanding shares fall in proportion. Delaware still requires a vote, though since 2023 a listed company needs only more votes for than against (DGCL Section 242(d)(2)). See reverse splits without a shareholder vote and Schedule 14C.
- Date announced. Item 5.03 covers the charter amendment and Item 3.03 the change to holders' rights. Under Nasdaq Rule 5250(e)(7) the company notifies Nasdaq at least ten calendar days before the market effective date, and under Rule 5250(b)(4) it discloses the split publicly by 12:00 p.m. ET at least two business days before. Nasdaq lists it on its Daily List for the two business days before, and halts a stock that tries to split without meeting these rules.
ADS ratio changes
Many foreign companies list American depositary shares (ADSs) in the US. Each ADS represents a fixed number of the company's ordinary shares, held by a depositary bank. An ADS ratio change alters only that number.
Say hypothetical Company Z changes its ratio from 1 ADS = 10 ordinary shares to 1 ADS = 100. A holder of 1,000 ADSs ends up with 100, and the ADS price is adjusted up by about ten. The ordinary shares are not consolidated.
To an ADS holder this looks like a reverse split. Nasdaq's bid-price rule applies to the listed Primary Equity Security, which Rule 5005(a)(33) defines to include ADSs, so a ratio change raises the price that is tested. It is a different corporate action. The opposite also happens: a company consolidates its ordinary shares and changes the ADS ratio by the same factor, so ADS holders see no change in count. Signal8 labels depositary-only changes "ADS ratio" on the Reverse Splits page and in reverse-split alerts.
Why companies do it: the bid-price rule
On Nasdaq, Listing Rule 5550(a)(2) (Capital Market) and Rule 5450(a)(1) (Global Market tiers) require a minimum closing bid of $1.00. A company falls out of compliance after 30 consecutive business days below that level and receives a deficiency notice. Under Rule 5810(c)(3)(A) it then gets 180 calendar days to regain compliance, by closing at or above $1.00 for at least 10 consecutive business days. A Capital Market company may be eligible for a second 180-day period.
The 1:250 cumulative cap and other Nasdaq limits
- The 250-to-1 cap. Under Rule 5810(c)(3)(A)(iv), a company that fails the bid-price requirement after reverse splits over the prior two years with a cumulative ratio of 250 or more to one gets no compliance period. Nasdaq issues a delisting determination immediately, which the company can appeal to a Hearings Panel.
- Cumulative means multiplied. A 1-for-10 split followed by a 1-for-25 split is a cumulative 1-for-250.
- The one-year rule. Since a rule change the SEC approved in January 2025, a company that fails the bid-price requirement within one year of any reverse split is also ineligible for a compliance period.
- Knock-on deficiencies. If the split pushes the company below another numeric standard (for example, publicly held shares), it gets no separate compliance period for that deficiency.
Hypothetical Company Y split 1-for-8 20 months ago and 1-for-40 3 months ago: 8 × 40 = 320 to 1. A bid-price failure now would bring a delisting determination, not a compliance period.
How to check a company on Signal8
- The Reverse Splits page lists splits in four tabs: Upcoming; Approved, no date; Vote pending; and Recently completed.
- The Delist Watch scanner lists companies with a listing-compliance flag, including those near the reverse-split cap.
- The Turnaround scanner lists companies that regained listing compliance in the last 90 days.
- The live SEC filings feed shows proxy statements and 8-Ks as they are filed, and a company's filings tab lists earlier split filings.
For how splits, resale registrations and convertibles can repeat, see the reverse split dilution cycle. An OTC company often splits before an uplisting.
Live screen
Scheduled reverse splits, next 14 days
FAQ
Is a reverse split good or bad?
The split itself is neither. It divides the share count and multiplies the price by the same ratio, so the company's value and your percentage ownership do not change. Companies usually do it to meet an exchange's minimum price rule. What it does not change is the business: cash, revenue, debts and earlier dilution are the same afterwards. For how splits can sit alongside new share issuance, see the reverse split dilution cycle.
What is Nasdaq's 250-to-1 reverse split rule?
Under Nasdaq Listing Rule 5810(c)(3)(A)(iv), a company that falls below the $1.00 bid price after reverse splits with a cumulative ratio of 250 to 1 or more over the prior two years is not given a compliance period. Nasdaq issues a delisting determination immediately, which the company may appeal. The ratios of separate splits are multiplied together.
Why does the CUSIP change after a reverse split?
The CUSIP identifies a specific security. A reverse split replaces the old shares with a new, consolidated security, so it normally receives a new CUSIP even though the ticker usually stays the same. Nasdaq requires the new CUSIP before it processes the split.
See it on DilutionScan
Companies DilutionScan covers, with the instruments read from their SEC filings. Open one to see each instrument and the filing it came from.
- GNSGenius Group Limited8 warrant series, 1 convertible, 1 ATM program, 3 shelf registrations and 2 completed offerings on file
- SMXSMX (Security Matters) Public Limited Company Ordinary Shares10 warrant series, 8 convertibles, 2 equity lines, 4 shelf registrations, 4 S-1 registrations and 2 completed offerings on file
- MLGOMicroAlgo, Inc. Ordinary Shares2 warrant series, 5 convertibles and 2 shelf registrations on file
- HOLOMicroCloud Hologram Inc. Ordinary Shares2 warrant series, 1 convertible, 3 shelf registrations and 2 completed offerings on file
Terms in this guide
- Reverse stock split
- A reverse stock split is a corporate action combining existing shares into fewer shares, cutting the share count and raising the per-share price by the same ratio; ownership percentages stay the same.
- Deficiency notice
- A deficiency notice is an exchange letter telling a listed company it no longer meets a continued listing requirement, such as the $1.00 minimum bid price, and starts a compliance period.
- Authorized shares
- Authorized shares are the maximum number of shares a company's charter allows it to issue, a cap that shares outstanding plus shares reserved for warrants, convertibles and plans cannot exceed.
- Form 8-K
- A Form 8-K is the SEC current report a public company files, generally within four business days, to disclose material events such as agreements, offerings, executive changes and listing notices.
Related guides
- What Is Stock Dilution? How New Shares Affect YouStock dilution explained with worked numbers: what happens to your ownership when a company issues new shares, and where to spot it coming in SEC filings.
- Trading Halts Explained: Halt Codes and LULD PausesWhat trading halt codes T1, T2, T12, H10, LUDP and M mean, how Limit Up-Limit Down price bands trigger pauses, and how a halted stock reopens for trading.
- Uplisting Explained: Moving From OTC to Nasdaq or NYSEWhat an uplisting from OTC to Nasdaq or NYSE involves, the listing standards a company must meet, and what FINRA's OTC daily list records when it moves.
- Nasdaq Deficiency Notices and the $1 Bid Price RuleNasdaq deficiency notices explained: the $1 minimum bid price rule and its 180-day periods, equity and late-filing standards, and the 2025 reverse split limits.
- The Reverse Split Dilution Cycle ExplainedHow reverse splits, resale registrations and convertible financings can repeat as a dilution cycle, with a typical timeline and a worked two-loop share count.
- Proxy Statements: PRE 14A vs DEF 14A ExplainedProxy statements explained: PRE 14A vs DEF 14A, why a preliminary proxy flags a reverse split or share increase, and how those Schedule 14A votes are counted.
Check any ticker for dilution
DilutionScan reads each covered company's SEC filings and lists its warrants, convertibles, ATM programs, shelves and S-1s on one page, with a dilution rating and cash runway.
This guide is from the Signal8 Academy, the research team behind DilutionScan. Educational content only. DilutionScan and Signal8 are not broker-dealers or investment advisers, and nothing here is a recommendation to buy or sell any security.