Form NT-NCEN Files Dataset

The Form NT-NCEN Files dataset is a collection of EDGAR submissions of Form NT-NCEN and its amendment counterpart Form NT-NCEN/A — the Rule 12b-25 notifications that registered investment companies file when they cannot timely deliver their annual Form N-CEN census report. Each record corresponds to one EDGAR accession and bundles the non-image documents from the original submission together with a publisher-written metadata.json descriptor. The filer is always the registrant entity — a mutual fund, ETF, closed-end fund, business development company, unit investment trust, or other 1940 Act registrant — and the notice is filed under Exchange Act Rule 12b-25 no later than one business day after the original N-CEN due date. Coverage begins in September 2018, immediately after Form N-CEN became the mandatory annual census report replacing the legacy Form N-SAR. Containers are delivered as ZIP archives, and the file types contained inside each container are HTML, JSON, PDF, and TXT.

Dataset APIs

Dataset Files

What This Dataset Contains

The dataset packages every EDGAR submission of Form NT-NCEN and Form NT-NCEN/A as a separate accession-level record. Form NT-NCEN is the notification instrument that registered investment companies use under Rule 12b-25 when they cannot timely file Form N-CEN — the annual census report required of investment companies registered under the Investment Company Act of 1940. N-CEN replaced the earlier Form N-SAR effective June 1, 2018 for most filers (with a later compliance date for unit investment trusts), and NT-NCEN began appearing on EDGAR in the same window. The dataset's coverage therefore starts in September 2018, immediately after N-CEN compliance became mandatory, and extends through the most recent refresh.

A single NT-NCEN filing is short — typically a single HTML document of roughly 15 to 25 KB — because the form is procedural rather than substantive. It states that an annual report will be late, briefly explains why, and identifies the registrant and a contact person. It is not itself the late report; the actual Form N-CEN is filed separately, later, under its own form type and accession number. The dataset is distributed as monthly ZIP containers; each container holds accession-level folders, and the file types found across the dataset are HTML, JSON, PDF, and TXT.

Content Structure of a Single Record

What one record represents

One record in the Form NT-NCEN Files dataset corresponds to a single EDGAR submission of Form NT-NCEN or its amendment counterpart Form NT-NCEN/A, identified by a unique EDGAR accession number. Each record is materialized as one accession-level folder; the folder name is the 18-digit accession number with the EDGAR dash separators stripped (for example 000139834425022398 corresponds to the canonical accession 0001398344-25-022398). The folder bundles the non-image documents from the original EDGAR submission together with a single metadata.json descriptor written by the dataset publisher.

The record unit is therefore one notification of late filing made by a registered investment company. Each notification is the registrant's formal statement, made under Exchange Act Rule 12b-25, that it cannot meet the statutory deadline for its Form N-CEN annual census report. NT-NCEN/A records represent amendments to a previously submitted notice and share the same internal structure; they typically supersede or correct narrative content, contact information, check-box selections, or signer information from the original NT-NCEN.

What the underlying filing is

NT-NCEN is a specialized variant of the SEC's general Form 12b-25 notification template. Rule 12b-25 under the Securities Exchange Act of 1934 codifies the procedure by which a registrant notifies the Commission that a periodic or annual report will be late, and obtains a short extension if the notice is filed on or before the original due date and the conditions of paragraph (b) of the rule are met. The Form 12b-25 template lists, in one row of check boxes, every periodic report it can accompany: Form 10-K, Form 20-F, Form 11-K, Form 10-Q, Form 10-D, Form N-CEN, and Form N-CSR. When a filer ticks the N-CEN box, the submission is indexed on EDGAR as form type NT-NCEN; the body of the document is otherwise the same Form 12b-25 layout used for every other late-notice filing. NT-NCEN/A is the same template re-submitted as an amendment, carrying its own accession number and pointing implicitly to the prior NT-NCEN by registrant and period of report.

Content layers in a single record

At the dataset-packaging layer, one record folder contains two kinds of objects:

1. A metadata.json descriptor written by the publisher. This file is always present and summarizes the EDGAR submission in structured form: form type, accession number, filing timestamp, effectiveness date, period of report, primary-document URLs, filer-entity blocks, and series/class identifiers where applicable.
2. The primary form document(s) from the original EDGAR submission, with image files filtered out. The file-types present in the dataset are HTML, JSON, PDF, and TXT. For NT-NCEN the overwhelmingly typical case is a single SGML-wrapped HTML document representing the Form 12b-25 / NT-NCEN narrative; occasional records also carry PDF exhibits.

At the source-document layer, the primary HTML follows the SEC Form 12b-25 template, which is organized into a header block, three numbered Parts (Part I, Part II, Part III), a fourth section labeled Part IV (Other Information), and a signature block. Each Part is constructed from a short, fixed set of check boxes and free-text fields, so the document is highly templated and easily comparable across filers.

Component-by-component breakdown

metadata.json

The descriptor is a single JSON object whose principal fields are:

• formType — either NT-NCEN or NT-NCEN/A.
• accessionNo — the EDGAR accession in canonical dashed form (for example 0001398344-25-022398).
• filedAt — full submission timestamp with timezone offset, for example 2025-12-12T16:19:46-05:00.
• effectivenessDate — EDGAR effectiveness date in YYYY-MM-DD form.
• periodOfReport — the period the late Form N-CEN would cover; for NT-NCEN this is the fiscal year-end of the registrant (for example 2025-09-30).
• description — a fixed descriptive string such as "Form NT-NCEN - Notice under Exchange Act Rule 12b-25 of inability to timely file Form N-CEN".
• linkToFilingDetails — URL to the primary form document on www.sec.gov.
• linkToHtml — URL to the EDGAR filing index page (...-index.htm).
• linkToTxt — URL to the full SGML submission text bundle.
• linkToXbrl — empty for NT-NCEN, which carries no XBRL payload.
• documentFormatFiles — an array of every document in the original EDGAR submission, each element carrying sequence, size, documentUrl, type, and optionally a description. The complete submission text file is enumerated here even though it is not repackaged on disk.
• dataFiles — empty for NT-NCEN; the slot is reserved for structured data exhibits such as XBRL instance documents in form types that use them.
• seriesAndClassesContractsInformation — an array of series and class/contract identifiers when the filer is an investment company with registered series and classes; it can be empty when the filer reports at the registrant level only.
• entities — an array of one or more filer-entity objects (see below).
• id — an internal 32-character hexadecimal content identifier assigned by the publisher.

Each element of entities[] describes one EDGAR filer participating in the submission and contains: cik, companyName (with the EDGAR role suffix appended, typically (Filer)), fileNo (the SEC file number, almost always in the 811- series used for Investment Company Act registrants), act (set to 40 to denote the Investment Company Act of 1940), fiscalYearEnd in MMDD form, stateOfIncorporation, irsNo, filmNo, and type (the form type as carried in the EDGAR header for that entity).

Primary form document — SGML wrapper

The primary HTML file is delivered inside the EDGAR SGML document envelope. The header lines <DOCUMENT>, <TYPE>NT-NCEN, <SEQUENCE>1, <FILENAME>..., and optionally <DESCRIPTION> precede the inline HTML body, and the file closes with </TEXT></DOCUMENT>. Filenames are issuer-chosen (for example fp0096574-1_ntncen.htm); the _ntncen suffix is a common but not guaranteed naming hint. The HTML body itself is laid out with the legacy <TABLE>, <P>, and <FONT> tags that EDGAR-era form templates rely on, rather than modern semantic markup.

Form 12b-25 / NT-NCEN body — section by section

The body of the document is built from the standard Form 12b-25 template. The sections appear in the following order:

• Header block. The page begins with "UNITED STATES SECURITIES AND EXCHANGE COMMISSION, Washington, D.C. 20549" and the form title (either "NOTIFICATION OF LATE FILING" or, for amendments, the same title prefixed with "AMENDED"). A row of check boxes follows, enumerating the periodic reports the notice can accompany — Form 10-K, Form 20-F, Form 11-K, Form 10-Q, Form 10-D, Form N-CEN, and Form N-CSR. For an NT-NCEN filing the Form N-CEN box is checked. A "For Period Ended" line records the fiscal period of the late report and mirrors the periodOfReport value in metadata.json. A separate "Transition Report on Form ___" line accommodates the unusual case where the late filing is a transition report rather than a regular annual census report. The header also carries the SEC file number (the 811-series number for the registrant), CIK, and an indication of any prior 12b-25 already filed for the same period.

• Part I — Registrant Information. Carries the full legal name of the registrant and the address of its principal executive office (street, city, state, and ZIP code). For fund complexes the registrant name is the registered investment company itself (the trust or fund), not the adviser, sponsor, or distributor.

• Part II — Rules 12b-25(b) and (c). A short fixed block of three lettered items, each with a check box: (a) whether the delay could not be eliminated without unreasonable effort or expense, (b) whether the subject report, portion thereof, or transition report will be filed within the rule's grace period after the original due date, and (c) whether an accountant's statement attesting to the difficulty is attached as an exhibit. The combination of checks taken in Part II is what formally invokes the Rule 12b-25 extension; the grace period inherited from Rule 12b-25 is fifteen calendar days for annual-type reports (which includes Form N-CEN) and five calendar days for quarterly reports.

• Part III — Narrative. A free-text section providing the explanation of why Form N-CEN cannot be filed on time. The narrative is typically a single short paragraph and commonly references events such as delayed audit completion, valuation revisions for fund holdings, late receipt of information from a sub-adviser or third-party service provider, transitions in fund administration or accounting agents, fund mergers or reorganizations, or operational disruptions. Boilerplate is common, and filers occasionally paste in language that refers to Form N-CSR (the semiannual/annual shareholder report form, which uses the same 12b-25 template); this is a side effect of the shared template rather than a contradiction of the form type.

• Part IV — Other Information. Three numbered items: (1) the name and telephone number of a contact person at the registrant; (2) a Yes/No check box asking whether all other periodic reports required under Section 13 or Section 15(d) of the Exchange Act, or Section 30 of the Investment Company Act of 1940, have been filed within the past twelve months (or for any shorter period of required filing); and (3) a Yes/No check box asking whether significant changes in results of operations from the corresponding prior period are anticipated, together with space to explain any such anticipated changes. For a Form N-CEN context the third item is frequently answered "No" because N-CEN is a census report rather than a results-of-operations disclosure.

• Signature block. A dated /s/ electronic signature with the printed name and title of the signer, who is typically an officer of the trust (President, Treasurer, Chief Compliance Officer, Vice President, Assistant Secretary, or similar). The signature block closes the document immediately before the SGML </TEXT></DOCUMENT> terminators.

What is included in the record

A record bundles, for one EDGAR accession:

• The publisher-written metadata.json descriptor.
• The primary form document containing the full Form 12b-25 / NT-NCEN body, in its SGML-wrapped HTML form, exactly as filed.
• Any additional non-image documents that were part of the original EDGAR submission. The file-types found in the dataset are HTML, JSON, PDF, and TXT, so a record may include, for example, a PDF exhibit such as an accountant's statement under Rule 12b-25(c), or an additional HTML exhibit. The metadata's documentFormatFiles array enumerates everything that was submitted, including the EDGAR complete-submission .txt bundle.

Both NT-NCEN and NT-NCEN/A submissions are included; the amendment status is carried in formType rather than in a separate folder convention.

What is excluded or structurally separate

Several categories of content are deliberately not in the record:

• Image files. GIF, JPG, and PNG attachments from the original EDGAR submission are filtered out of the dataset folder.
• The complete SGML submission .txt bundle. Although referenced in documentFormatFiles and reachable via linkToTxt, the monolithic SGML container that EDGAR assembles for the submission is not repackaged into the folder; only the individual decomposed documents are present.
• The underlying Form N-CEN. The late annual census report itself is a separate EDGAR filing with its own accession number and is not part of the NT-NCEN record. It appears later under form type N-CEN (or N-CEN/A) when the registrant actually files it.
• Any prior NT-NCEN being amended. An NT-NCEN/A record stands on its own; the original NT-NCEN that it amends has a separate accession folder, and the two are linked only implicitly through registrant CIK and periodOfReport.
• Structured XBRL data. Form NT-NCEN does not carry an XBRL payload, so linkToXbrl and dataFiles are empty.

Changes in required content and structure over time

Form NT-NCEN is structurally young and structurally stable. The form did not exist before mid-2018: the SEC adopted Form N-CEN in 2016 to replace Form N-SAR as the annual census report for registered investment companies, with a compliance date of June 1, 2018 for most filers and a later date for unit investment trusts. The companion notification form NT-NCEN entered live use in the same window, which is why this dataset's coverage begins in September 2018.

Because NT-NCEN is a templated derivative of Form 12b-25 — itself a long-standing notification instrument under Exchange Act Rule 12b-25 — its internal layout (header check-box row, Part I through Part IV, signature) has not undergone material restructuring during the dataset's coverage period. The substantive content rules are inherited from Rule 12b-25 and from the instructions to Form 12b-25, which set the grace period at fifteen calendar days for an annual report (and five calendar days for a quarterly report) and require the narrative and accountant-statement disclosures described above. Across the post-2018 period, the dataset therefore reflects a consistent set of required fields: registrant identification, period of report, late-report identification (N-CEN box), Rule 12b-25(b) and (c) representations, narrative reason, contact information, ancillary representations on other reports and on anticipated changes in results, and signature.

The principal cross-time variations are operational rather than structural: which check box on the periodic-report row is selected (occasionally a filer ticks N-CSR rather than N-CEN by mistake when reusing prior boilerplate), whether an accountant's statement is attached as a PDF exhibit, whether the filer reports as a single registrant or as a registrant with multiple series and classes (reflected in the seriesAndClassesContractsInformation array), and the level of detail given in the narrative.

Data-format considerations

NT-NCEN has only ever existed in the post-2018 EDGAR era, so it was never filed in the legacy ASCII / plain-text submission style that older form types (10-K, 10-Q, 20-F) used in the 1990s. From its first filings, NT-NCEN has been submitted as HTML wrapped in the EDGAR SGML document envelope, and that has remained the standard format throughout the dataset's coverage window. PDF attachments appear occasionally as exhibits (most commonly accountant statements supporting Rule 12b-25(c) representations). The EDGAR complete-submission TXT bundle exists in the EDGAR archive for every filing but is not repackaged on disk.

Interpretation and extraction notes

Several nuances are worth keeping in mind when reading or extracting from these records:

• Amendments. NT-NCEN/A records carry their own accession numbers, period-of-report values, and entities[] blocks; they do not contain a structured back-reference to the prior NT-NCEN they amend. Pairing an amendment with its original requires matching on CIK plus periodOfReport (and sometimes inspecting the narrative for an explicit reference).
• Shared 12b-25 template. Because the body is a generic Form 12b-25 layout, narrative text occasionally refers to Form N-CSR or other late reports when filers reuse boilerplate; the authoritative form type is the EDGAR-indexed formType value, not the language in the narrative.
• Series and classes. Investment-company filers frequently span multiple registered series and classes. When that information is reported, it appears in the seriesAndClassesContractsInformation array rather than in the HTML body, and consumers should consult that array to associate the notice with specific series-level N-CEN filings that follow later.
• Check-box extraction. The check boxes on the periodic-report row, in Part II items (a)–(c), and in Part IV items (2)–(3) are rendered with table cells containing [X] or [ ] markers (or occasional graphical equivalents). Extraction therefore typically requires both text-level pattern matching and table-cell positional logic rather than reliance on form-control elements.
• Signatures. The /s/ convention is used in lieu of a graphical signature image, which is convenient given that image files are filtered out of the dataset; the signer's printed name and title remain present in plain HTML text.
• Contact information. Part IV item (1) carries free-text contact name and phone number for the registrant and is one of the few human-identifiable pieces of information consistently present in NT-NCEN filings. Address content otherwise appears only in Part I (principal executive office).
• Where each fact lives. Filing-level facts (CIK, file number, period of report, filed-at timestamp, fiscal year end, series/class identifiers) are reliably available in metadata.json and do not need to be re-extracted from the HTML body. Substantive content — the narrative reason for the delay, the specific check-box selections, the contact person, and the signer — lives only inside the HTML body.

Who Files or Publishes This Dataset, and When

Who files the record

The filer of Form NT-NCEN is the registered investment company (RIC) that owes an annual Form N-CEN under Section 30(a) of the Investment Company Act of 1940 and Rule 30a-1. The covered population includes:

• Open-end management investment companies (mutual funds), including series trusts filing at the registrant level.
• Exchange-traded funds (ETFs), whether organized as open-end funds or as UITs.
• Closed-end management investment companies, including listed closed-end funds and interval funds.
• Business development companies (BDCs), which are subject to N-CEN reporting through Section 64 of the 1940 Act.
• Unit investment trusts (UITs), which report on a calendar-year basis.
• Small business investment companies (SBICs) that are registered investment companies.

The legal filer is always the registrant entity (the trust, corporation, or other 1940 Act registrant), filed at the registrant CIK. Advisers, administrators, principal underwriters, and transfer agents may prepare and submit the form on the registrant's behalf but are not filers in their own right.

When the record is created or required

The triggering event is the registrant's inability to file Form N-CEN by its statutory due date, not the fiscal year end itself.

N-CEN due dates:

• Management investment companies and BDCs: 75 days after fiscal year end.
• UITs: 75 days after calendar year end.

NT-NCEN deadline: under Exchange Act Rule 12b-25 (applied through Rule 30a-1 and the General Instructions to Form N-CEN), the notice must be filed no later than one business day after the original N-CEN due date. The Rule 12b-25(b)(2) certification grants up to 15 additional calendar days to file the late N-CEN and have it treated as timely for related purposes.

The notice must state that the registrant cannot file on time, give the reasons in reasonable detail, indicate whether the N-CEN is expected within the 15-day extension, and include the Rule 12b-25(b)(2) representation that the delay could not be eliminated without unreasonable effort or expense.

Form NT-NCEN/A is an amendment to a previously filed NT-NCEN, typically used to revise the explanation of the delay or update the expected late-filing date. It does not extend the 15-day window, and it does not substitute for filing the underlying N-CEN.

Important distinctions

• Operating companies and foreign issuers delayed in filing annual or quarterly reports use Form 12b-25 (NT 10-K, NT 10-Q, NT 20-F). Those are not part of this dataset.
• Other fund-side NT forms cover different underlying filings: Form NT-NPORT (monthly portfolio holdings), Form NT-NCSR (semi-annual shareholder report), and the legacy Form NT-NSAR. NT-NCEN concerns only the annual N-CEN.
• Historical scope. Form N-CEN replaced Form N-SAR effective June 1, 2018, so NT-NCEN filings begin in EDGAR in 2018. The pre-2018 analogue for N-SAR delays was NT-NSAR, which is not included here.
• Series trusts. A single NT-NCEN filed at the trust level may relate to one, several, or all series; individual series are not separate filers.
• No relief from the underlying obligation. Filing NT-NCEN does not waive the N-CEN requirement. An N-CEN not filed within the 15-day extension is a late filing, and failure to file at all remains a Section 30(a) violation.

How This Dataset Differs From Similar Datasets or Filings

Form NT-NCEN sits in two overlapping families: the Rule 12b-25 "notification of late filing" family that spans all SEC reporters, and the narrower set of investment-company NT-* notices that delay specific 1940 Act disclosures. Distinguishing NT-NCEN requires separating it from the form whose lateness it announces (N-CEN) and from sibling notices that share the same procedural plumbing but reference different delayed filings.

Form N-CEN — the underlying annual census

N-CEN is the substantive annual census filed by registered investment companies under the 1940 Act, containing structured data on fund structure, service providers, securities lending, fees, and share classes. NT-NCEN is the procedural upstream notice: it announces that N-CEN will miss its deadline and explains why. The two are complementary, not substitutable. N-CEN carries the census payload; NT-NCEN carries only the delay explanation, an expected late-file date, and minimal registrant identifiers.

Form NT-NSAR — the retired predecessor

NT-NSAR served the same Rule 12b-25 function for Form N-SAR, the semi-annual report that N-CEN replaced in mid-2018. NT-NSAR covers the pre-2018 era; NT-NCEN covers September 2018 onward. A continuous time series of fund late-notices requires concatenating both and adjusting for the underlying cadence shift (semi-annual N-SAR to annual N-CEN).

Form NT-NCSR — late certified shareholder reports

NT-NCSR is the Rule 12b-25 notice for Form N-CSR, the audited annual or semi-annual shareholder report. Same filer population, same document structure, different underlying filing. A fund can be late on N-CSR without being late on N-CEN, and the two notices are filed independently.

Form NT-NPORT — late portfolio holdings reports

NT-NPORT is the Rule 12b-25 notice for Form NPORT-P, the monthly portfolio holdings report (publicly disclosed quarterly). Same filer base and procedural form as NT-NCEN, but the underlying filing is position-level holdings rather than operational census, and the monthly cadence means NT-NPORT volume per fund can substantially exceed NT-NCEN volume.

Form NT 10-K, NT 10-Q, NT 20-F — operating-issuer late notices

These are the Rule 12b-25 notices used by Exchange Act registrants for late 10-K, 10-Q, and 20-F filings. They share NT-NCEN's statutory basis, three-part document structure, and legal effect (a short conditional extension). They differ in regulatory regime (Exchange Act vs 1940 Act) and filer type (operating companies and foreign private issuers vs registered funds).

Form 12b-25 itself

Form 12b-25 is the master form prescribed by Rule 12b-25. "NT-NCEN," "NT-NCSR," "NT-NPORT," "NT 10-K," "NT 10-Q," and "NT 20-F" are EDGAR form-type labels for the same underlying Form 12b-25 routed by which filing is delayed. NT-NCEN is not a structurally distinct form; the dataset's value lies in the form-type filter that isolates 12b-25 notices tied specifically to N-CEN.

Boundary summary

NT-NCEN occupies a narrow, well-defined slot: the Rule 12b-25 late-notice for a single underlying form (N-CEN), filed by a single population (registered investment companies under the 1940 Act), on a single cadence (annual). It contains no census data and cannot substitute for N-CEN. Within the fund NT-* family it is distinguished by the underlying disclosure type; within the broader Rule 12b-25 family it is distinguished by regulatory regime and filer class. Its analytical value emerges in combination: paired with N-CEN to measure filing lag, or pooled with NT-NCSR and NT-NPORT to study filing-discipline behavior across the 1940 Act regime.

Who Uses This Dataset

Form NT-NCEN is a low-volume, high-signal filing: a registered investment company files it only when it cannot meet the N-CEN annual deadline. Users treat each record as a discrete control-environment signal and focus on three fields: the registrant, the explanation for delay, and the projected revised filing date.

Fund chief compliance officers

CCOs at fund complexes and their advisers use the dataset as a peer reference set when drafting their own NT-NCEN. They study the narrative explanation and the revised filing date to calibrate tone, specificity, and extension length, and to document that industry practice was surveyed.

Fund administrators and transfer agents

Administrators responsible for the N-CEN calendar use prior filings to establish base rates and common reasons (audit completion, subadviser transitions, system migrations, reorganizations) when advising boards or advisers on whether a delay is routine. The data feeds calendar tooling and escalation playbooks.

Audit firm fund practices

Assurance teams serving the registered fund industry read NT-NCEN as a control-environment indicator. A noticed delay can correlate with closing-process strain, valuation issues, or governance friction. Engagement teams cross-reference the registrant and explanation against existing client knowledge and prospect risk assessments.

Securities counsel in 1940 Act practice

Outside and in-house fund counsel use prior filings as drafting precedent for their own NT-NCEN notices and Rule 12b-25 representations, and to advise boards on whether a delay is anomalous or routine. The explanation language is the load-bearing field.

Operational due diligence teams

ODD teams at allocators, fund-of-funds, pensions, endowments, insurance companies, and investment consultants screen NT-NCEN filings against their manager watchlists. A hit triggers follow-up on cause, remediation, and investor disclosure. They extract registrant, CIK, filing date, and explanation into monitoring systems.

Regulatory affairs and industry association staff

Regulatory teams at large fund complexes and trade associations cite aggregated NT-NCEN volume and reasons in comment letters and policy dialogue when arguing for deadline relief or rule clarifications.

Academic researchers in fund reporting

Finance, accounting, and law researchers use the dataset as a natural sample for studying reporting frictions: which fund characteristics correlate with delays, what explanations cluster around reorganizations or adviser changes. The small sample supports qualitative and case-study work rather than large-N inference.

Regtech and fund-data vendors

Vendors building compliance dashboards, filing calendars, and fund-data products ingest NT-NCEN to power late-filing alerts, peer-comparison views, and CIK-based historical lookups, normalizing the explanation text and revised filing date into their schemas.

LLM and RAG developers for fund compliance

Teams building retrieval assistants for compliance, audit, and legal users treat the dataset as a focused corpus of late-filing language, useful for training extractors that pull reason, responsible party, and revised date into structured fields.

Journalists covering fund operations

Reporters on the asset management beat scan new NT-NCEN filings as early signals of fund-family trouble, subadviser disputes, or adviser distress, then follow up with the registrant. They rely on the registrant name, filing date, and explanation.

Specific Use Cases

The dataset's value is event-driven rather than statistical. Each record is treated as a discrete late-filing signal. The workflows below show how practitioners extract value from a small, focused corpus of Rule 12b-25 notices tied specifically to Form N-CEN.

Drafting a peer-precedent NT-NCEN notice

Fund counsel and CCOs preparing their own NT-NCEN pull the Part III narrative text from prior filings by registrants of similar size or fund type to calibrate the language of the delay explanation, the Rule 12b-25(b) representations, and the projected late-file date. The HTML body provides the load-bearing free-text fields; metadata.json supplies CIK and periodOfReport to narrow the precedent set to comparable fiscal year-ends.

Manager watchlist monitoring for operational due diligence

ODD teams at allocators, pensions, and fund-of-funds join the entities[].cik field against their internal manager watchlists and trigger a follow-up workflow whenever a hit lands. The filedAt timestamp, periodOfReport, and Part III narrative feed an alert containing registrant, fiscal year-end, stated reason for delay, and revised filing date — the minimum inputs needed to open a remediation enquiry with the adviser.

Closing-strain and audit-completion signal for fund audit practices

Assurance teams reading NT-NCEN as a control-environment indicator scan Part III narratives for recurring patterns such as delayed audit completion, valuation revisions, sub-adviser data gaps, or service-provider transitions. Hits against existing or prospective client CIKs feed engagement risk assessments and client-acceptance scoring without waiting for the eventual N-CEN to land.

Pairing NT-NCEN with the eventual N-CEN to measure filing lag

Analysts and academic researchers join NT-NCEN records to the subsequent N-CEN filings by registrant CIK and periodOfReport to compute actual late-file lag against the fifteen-day Rule 12b-25 grace period. The output supports case studies of which fund characteristics, reorganization events, or adviser changes correlate with notices that overrun the statutory extension.

Building amendment chains from NT-NCEN/A records

Because NT-NCEN/A amendments carry no structured back-reference to the original notice, consumers reconstruct amendment chains by grouping records on CIK plus periodOfReport and ordering by filedAt. The resulting chain shows what was corrected — narrative content, contact person, check-box selections, or signer — and supports board-reporting workflows that need a clean record of how a delay disclosure evolved.

Extracting a structured corpus for compliance RAG and extractors

LLM teams building retrieval assistants for 1940 Act compliance use the dataset as a focused training and evaluation corpus for extractors that pull reason-for-delay, responsible party (adviser, sub-adviser, administrator, auditor), and revised filing date from Part III narratives into structured fields. The small size and templated Form 12b-25 layout make it tractable for hand-labeled gold sets and check-box parsing benchmarks.

Dataset Access

Dataset Index JSON API: https://api.sec-api.io/datasets/form-ntncen-files.json

This endpoint returns dataset metadata, including name, description, last update timestamp, earliest sample date (2018-09-01), total record and size counters, the form types covered (NT-NCEN and NT-NCEN/A), the container format (ZIP), and the file types contained inside each container (HTML, JSON, PDF, TXT). It also returns the full dataset download URL and the list of individual container files, each with its own size, record count, updated timestamp, and direct download URL. This endpoint does not require an API key, which makes it suitable for polling daily to detect which containers were modified in the most recent refresh and to plan incremental downloads on a per-container basis.

Example response:

          1
          {
        

          2
            "datasetId": "1f13365b-9ae0-69f9-88f3-3a79436a6f80",
        

          3
            "datasetDownloadUrl": "https://api.sec-api.io/datasets/form-ntncen-files.zip",
        

          4
            "name": "Form NT-NCEN Files Dataset",
        

          5
            "updatedAt": "2026-04-15T18:17:22.927Z",
        

          6
            "earliestSampleDate": "2018-09-01",
        

          7
            "totalRecords": 140,
        

          8
            "totalSize": 613633,
        

          9
            "formTypes": ["NT-NCEN", "NT-NCEN/A"],
        

          10
            "containerFormat": "ZIP",
        

          11
            "fileTypes": ["HTML", "JSON", "PDF", "TXT"],
        

          12
            "containers": [
        

          13
              {
        

          14
                "downloadUrl": "https://api.sec-api.io/datasets/form-ntncen-files/2025/2025-12.zip",
        

          15
                "key": "2025/2025-12.zip",
        

          16
                "size": 13818783,
        

          17
                "records": 154,
        

          18
                "updatedAt": "2026-04-15T18:17:22.927Z"
        

          19
              }
        

          20
            ]
        

          21
          }
        

Download Entire Dataset: https://api.sec-api.io/datasets/form-ntncen-files.zip?token=YOUR_API_KEY

Use this URL to download the complete dataset as a single ZIP archive containing all Form NT-NCEN and NT-NCEN/A filings from September 2018 to the latest refresh. This endpoint requires an API key.

Download Single Container: https://api.sec-api.io/datasets/form-ntncen-files/2025/2025-12.zip?token=YOUR_API_KEY

Use this URL pattern to download a single monthly container instead of the full archive. Container paths are organized by year and month and are listed under the containers array of the dataset index JSON. This endpoint requires an API key.

Frequently Asked Questions

What form does this dataset cover?

The dataset covers Form NT-NCEN and its amendment counterpart Form NT-NCEN/A, the Rule 12b-25 notifications that registered investment companies file when they cannot timely deliver Form N-CEN, their annual census report under the Investment Company Act of 1940. NT-NCEN is a specialized variant of the general Form 12b-25 notification template, indexed on EDGAR as form type NT-NCEN when the filer ticks the Form N-CEN check box on the periodic-report row.

What does one record in this dataset represent?

One record corresponds to a single EDGAR submission of Form NT-NCEN or NT-NCEN/A, identified by a unique accession number. Each record is materialized as one accession-level folder that bundles the non-image documents from the original submission together with a publisher-written metadata.json descriptor.

Who is required to file Form NT-NCEN?

The legal filer is always the registrant entity — the registered investment company that owes an annual Form N-CEN under Section 30(a) of the Investment Company Act of 1940 and Rule 30a-1. The covered population includes mutual funds, ETFs, closed-end funds, business development companies, unit investment trusts, and SBICs that are registered investment companies. Advisers, administrators, and transfer agents may prepare the form but are not filers in their own right.

When must Form NT-NCEN be filed?

Under Exchange Act Rule 12b-25 (applied through Rule 30a-1 and the General Instructions to Form N-CEN), the notice must be filed no later than one business day after the original N-CEN due date, which is 75 days after fiscal year end for management investment companies and BDCs, and 75 days after calendar year end for UITs. A valid Rule 12b-25(b)(2) certification grants up to 15 additional calendar days to file the late N-CEN.

What time period does the dataset cover?

Coverage begins on September 1, 2018 — immediately after Form N-CEN became the mandatory annual census report replacing the legacy Form N-SAR effective June 1, 2018 — and extends through the most recent refresh. Pre-2018 late-notice analogues filed as NT-NSAR are not included in this dataset.

What file format is the dataset distributed in?

The dataset is distributed as ZIP containers organized by year and month. Each container holds accession-level folders, and the file types found across the dataset are HTML, JSON, PDF, and TXT. The primary form document is an SGML-wrapped HTML file, and structured metadata for every record is provided in a metadata.json descriptor.

How does this dataset differ from Form N-CEN itself?

Form N-CEN is the substantive annual census filed by registered investment companies, containing structured data on fund structure, service providers, securities lending, fees, and share classes. NT-NCEN is the procedural upstream notice that announces N-CEN will miss its deadline and explains why. The two are complementary, not substitutable: NT-NCEN carries no census payload, only the delay explanation, expected late-file date, and minimal registrant identifiers.