SEC Form 25 Stock Delisting Notification: Engineer Guide 2026

Building FinanceTrackDaily on the SEC EDGAR API means I aggregate live data on roughly 3,400 publicly listed US stocks. One of the most underappreciated filings I track is Form 25 — the official notification a company files when its securities are removed from a national securities exchange. From an engineer's perspective, every Form 25 is a row that disappears from my equity universe, so understanding the form's mechanics is not optional. It is core to keeping aggregated data accurate.

This guide walks through what Form 25 is, who files it, the 10-day effectiveness window, how it differs from Form 15, and what an investor (or a developer building on EDGAR) actually sees when a delisting hits. Citations point to the SEC's own rule text and EDGAR documentation throughout.

What Is SEC Form 25?

Form 25 is the Notification of Removal from Listing and/or Registration under Section 12(b) of the Securities Exchange Act of 1934. It is the document that formally severs a security's relationship with a national securities exchange — NYSE, Nasdaq, NYSE American, Cboe BZX, IEX, or any other registered exchange.

The form is governed by Rule 12d2-2 under the Exchange Act. The SEC adopted significant amendments to this rule in 2005, modernizing the process so that delistings became effective ten days after filing rather than requiring a separate SEC order in most cases. The rule text and adopting release are available directly on sec.gov (Release No. 34-52029).

What Form 25 does not automatically do is end a company's reporting obligations. A delisted company can still be SEC-registered and still file 10-Ks, 10-Qs, and 8-Ks until it files a separate Form 15 to deregister. That distinction trips up a lot of newcomers, and I'll cover it in detail below.

Who Files Form 25 — Exchange vs. Issuer

From an engineering perspective, the most important field on Form 25 is who actually filed it. There are two paths:

1. Exchange-Initiated Delisting

The exchange itself files Form 25 to remove a security. This typically happens when a company falls below the exchange's continued listing standards. Common triggers I have seen in EDGAR history include:

• Stock price trading below $1.00 for 30 consecutive trading days (NYSE and Nasdaq minimum bid price rules)
• Market capitalization falling below required thresholds (Nasdaq Capital Market requires $35 million market value of listed securities, for example)
• Failure to maintain minimum stockholders' equity (Nasdaq Capital Market requires $2.5 million)
• Failure to file periodic reports on time (a common 10-K or 10-Q delinquency)
• Bankruptcy filing or going-concern doubt
• Insufficient public float or fewer than the required number of round-lot holders

Companies usually receive a deficiency notice and a cure period before the exchange ultimately files Form 25. NYSE's Listed Company Manual and Nasdaq's Listing Rules document the exact thresholds, and both exchanges publish their listing-standards thresholds publicly.

2. Issuer-Initiated (Voluntary) Delisting

The company itself files Form 25 to voluntarily remove its securities. This is increasingly common, and the reasons cluster around a few patterns:

• Mergers and acquisitions — the acquired company's stock no longer needs to trade because shareholders have been cashed out or rolled into the acquirer's stock
• Going-private transactions — management buyouts or private equity acquisitions where the issuer wants to avoid public reporting costs
• Cost reduction — small-cap companies that find Sarbanes-Oxley compliance and SEC reporting too expensive relative to trading volume
• Switching exchanges — a company moving from NYSE to Nasdaq (or vice versa) will technically file Form 25 to delist from the original exchange

For voluntary issuer delistings, Rule 12d2-2(c) requires a written notice to the exchange at least 10 days before the Form 25 filing, plus a board resolution authorizing the action and a press release announcing the decision.

The 10-Day Effectiveness Window

Once Form 25 is filed on EDGAR, the delisting becomes effective 10 days later for purposes of the security's removal from the exchange (Rule 12d2-2(d)(1)). This is one of the most operationally important facts about the filing and something I had to hard-code into the FinanceTrackDaily ingestion pipeline.

Termination of registration under Section 12(b) follows a longer timeline — 90 days after the Form 25 filing, unless the SEC accelerates or extends the period. During that 90-day window, the security technically remains registered, even though it is no longer listed.

From a data-pipeline view, this means three states a stock can be in:

1. Listed and trading — pre Form 25 filing
2. Delisted from exchange but still registered — between day 10 and day 90 after Form 25
3. Fully deregistered — after the 90-day window or after Form 15 is filed

For most retail investors the second state is invisible, because the stock is no longer trading on a major exchange. It may, however, continue trading over-the-counter on the OTC Markets (Pink Sheets, OTCQB, or OTCQX tiers) during this period.

Form 25 vs Form 15 — A Critical Distinction

This is the question I get most often from developers using SEC data: what is the difference between Form 25 and Form 15?

A typical sequence I see in EDGAR for a fully exiting public company looks like this: Form 25 filed first, exchange listing ends 10 days later, and Form 15 filed soon after to terminate Section 12(g) reporting. Some companies skip Form 15 entirely and remain SEC-reporting under Section 15(d) of the Exchange Act because they have outstanding registered securities.

Reading a Form 25 on EDGAR — Engineer Walkthrough

The actual Form 25 filing is short — usually a single PDF or HTML document. The filing index on EDGAR lists it under the form type 25 or 25-NSE (the latter is filed by exchanges; "NSE" stands for National Securities Exchange).

The key fields you will see in a Form 25:

• Issuer name and CIK — the Central Index Key identifying the company
• Title and class of securities — common stock, preferred stock, warrants, debt, ADRs
• Exchange filing — which exchange is being delisted from
• Date of effectiveness — the 10-day computed date
• Reason for delisting — typically a brief paragraph or rule citation (such as a Nasdaq listing rule reference)
• Signature block — exchange officer signature for Form 25-NSE, or issuer corporate officer for issuer-filed

From an aggregation pipeline standpoint, here is how I handle Form 25 ingestion at FinanceTrackDaily:

1. Pull the daily EDGAR full-text index using the full-index/YYYY/QTR/master.idx endpoint
2. Filter rows where form type matches 25 or 25-NSE
3. Resolve each filing to its detail page using the CIK and accession number
4. Schedule the ticker for status change to delisted 10 calendar days after the filing date
5. Cross-reference with subsequent Form 15 filings to mark companies that have gone fully dark

The full list of EDGAR endpoints is documented at sec.gov/edgar in the developer resources section. The fair-use limit for the EDGAR API is 10 requests per second with a proper User-Agent header, which is plenty for tracking Form 25 filings since they are far less frequent than 8-K or 10-Q filings.

How Many Form 25 Filings Happen Each Year?

Form 25 filings are not constant. Looking at the EDGAR full-text index across recent years, the volume varies with overall market conditions, M&A activity, and the IPO cycle. Years with heavy SPAC unwinding tend to produce more Form 25 filings as failed business combinations result in delistings. Years with strong IPO markets, by contrast, see net increases in listed companies.

The number of US-listed stocks on major exchanges has trended downward over the last two decades. Federal Reserve and academic research (notably the Doidge, Karolyi, and Stulz "US Listing Gap" research published in the Journal of Financial Economics) document this decline, with the count of US-listed firms dropping from roughly 7,500 in 1996 to fewer than 4,500 by the mid-2010s. Voluntary Form 25 filings driven by going-private transactions are a meaningful contributor.

What Investors See When a Stock Is Delisted

If you hold a stock that gets delisted via Form 25, here is the typical experience:

• Your broker may continue to show the position, but the price feed and trading interface will change
• The stock may move to over-the-counter trading on the OTC Markets, where bid-ask spreads tend to be wider and liquidity is generally lower
• Some brokers restrict OTC trading or charge additional commissions for it
• If the company is acquired, your shares are typically converted to cash, acquirer stock, or a combination, depending on the merger agreement
• If the company files Form 15 and goes fully dark, ongoing financial information becomes harder to find

Investors sometimes assume a delisting means their shares are worthless. That is not necessarily the case. A delisted stock can still have value, especially in M&A scenarios where a clear buyout price is part of the transaction. However, illiquidity risk is real, and the FINRA Investor Education Foundation publishes resources at finra.org explaining what to do when a holding is delisted.

Form 25 in the M&A Context

The most common Form 25 I see in EDGAR is the post-merger filing. The pattern looks like this:

1. Acquirer and target announce a merger via Form 8-K and Schedule 14A proxy
2. Shareholders of the target approve the deal at a special meeting
3. Closing occurs and target shareholders receive consideration
4. Acquirer's counsel files Form 25 on the target's behalf to delist
5. Target subsequently files Form 15 to deregister and end SEC reporting

For aggregator engineering, the M&A path is interesting because the target's CIK does not necessarily disappear immediately. The CIK remains in EDGAR, but no new filings are made after Form 15 is processed. I keep the historical filings indexed so users searching for the old ticker still find context, but I flag the company status as "delisted (acquired)" with the acquirer's CIK linked.

Common Questions About Form 25

Does Form 25 always mean the company is in trouble?

No. The majority of Form 25 filings I see in EDGAR are voluntary, driven by mergers and going-private transactions. Distress-driven delistings exist but are a minority of total filings.

Can a delisted company relist?

Yes. A company that was delisted for failing to meet listing standards can apply to relist once it cures the deficiency. Some companies that went private via Form 25 and Form 15 later return to public markets through a new IPO or direct listing. Each path requires a fresh registration filing under the Securities Act of 1933.

Is Form 25 the same as a stock being halted?

No. A trading halt is a temporary pause imposed by the exchange (often pending news or to investigate volatility) and is governed by exchange rules, not Form 25. A Form 25 is the formal removal from listing.

Where can I find historical Form 25 filings?

The SEC EDGAR full-text search at efts.sec.gov/LATEST/search-index?q=&forms=25 returns recent filings. The full-index files at sec.gov/Archives/edgar/full-index/ provide quarterly snapshots going back decades.

Disclaimer

This article is for informational purposes only and is not financial advice, legal advice, or tax advice. SEC filings can be technical, and the implications of a delisting depend on the specific company, the type of filing, and an investor's individual circumstances. Before making any investment decision based on a Form 25 or Form 15 filing, consult a licensed financial advisor, broker-dealer, or attorney. The author is a software engineer who builds the FinanceTrackDaily SEC EDGAR aggregator and is not a registered investment advisor, broker-dealer, certified financial planner (CFP), or chartered financial analyst (CFA). Information is sourced from public SEC documents (sec.gov), FINRA (finra.org), and Federal Reserve research, and is presented for educational understanding of the US securities filing system.