fund_rfid_data/SEC_FUND_DATA_RESEARCH.md

SEC Fund Prospectus & Reference Data Research

1. Overview: Where Are Fund Prospectuses at the SEC?

All US-registered investment companies (mutual funds, ETFs) must file their prospectuses and amendments with the SEC via the EDGAR (Electronic Data Gathering, Analysis, and Retrieval) system. These filings are publicly available at no cost.

Relevant SEC Filing Form Types

Form Type	Description	Content
N-1A	Initial registration statement for open-end management investment companies (mutual funds)	Full prospectus + SAI (Statement of Additional Information)
485BPOS	Post-effective amendment that becomes effective upon filing	Updated prospectus (most common annual update)
485APOS	Post-effective amendment filed in advance	Prospectus amendment requiring SEC review
497	Definitive materials filed under Investment Company Act	Prospectus supplements, SAI updates, sticker supplements
497K	Summary prospectus for mutual funds	Condensed key-facts prospectus (3-4 pages per fund/class)
N-CSR	Certified shareholder report	Annual/semi-annual report with financial statements
NPORT-P	Monthly portfolio holdings (public quarterly)	Detailed portfolio positions

Key Insight for Your Use Case

• 485BPOS filings contain the full statutory prospectus (the main legal document)
• 497K filings contain the summary prospectus (condensed, standardized format ideal for LLM training)
• 497 filings contain supplements and amendments that modify the prospectus

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2. Where Is the Reference Data?

Reference data for funds and their share classes comes from three complementary sources:

Source A: Investment Company Series and Class Information (CSV/XML)

• URL: https://www.sec.gov/data-research/sec-markets-data/investment-company-series-class-information
• Download: https://www.sec.gov/files/investment/data/other/investment-company-series-class-information/investment-company-series-class-2025.csv
• Updated: Monthly (latest: June 2025)
• Contains:
  • CIK (Central Index Key) — the umbrella fund company identifier
  • File Number (811-XXXXX) — Investment Company Act registration number
  • Series ID (S######) — unique identifier per fund series (e.g., "Vanguard 500 Index Fund")
  • Class ID (C######) — unique identifier per share class
  • Ticker Symbol
  • Fund/Class name
  • Status (active/inactive)

Source B: Mutual Fund Prospectus Risk/Return Summary Data Sets (XBRL)

• URL: https://www.sec.gov/data-research/sec-markets-data/mutual-fund-prospectus-riskreturn-summary-data-sets
• Download: Quarterly ZIP files, e.g., https://www.sec.gov/files/dera/data/mutual-fund-prospectus-risk/return-summary-data-sets/2025q2_rr1.zip
• Coverage: December 2010 to present (quarterly updates)
• Contains structured XBRL data extracted from prospectuses:
  • Expense ratios (management fees, 12b-1 fees, total annual operating expenses)
  • Fee tables and expense examples
  • Performance bar charts and tables (1yr, 5yr, 10yr returns)
  • Risk/return narratives
  • Investment objectives
  • Principal strategies and risks

Source C: EDGAR Submissions API (JSON)

• URL: https://data.sec.gov/submissions/CIK{cik_padded}.json
• Contains: Full filing history per entity, including metadata (dates, form types, accession numbers, primary document URLs)

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3. Unique Identifiers for Each Share Class

Identifier	Format	Source	Scope
CIK	10-digit number (e.g., 0000036405)	SEC EDGAR	Umbrella fund entity (investment company trust)
File Number	811-XXXXX	SEC	Investment Company Act registration
Series ID	S###### (e.g., S000002839)	SEC EDGAR	Individual fund within the trust
Class ID	C###### (e.g., C000007773)	SEC EDGAR	Individual share class
Ticker	1-5 chars (e.g., VFIAX)	Exchange	Share class trading identifier
CUSIP	9-char alphanumeric	CUSIP Global Services	Security-level (per share class)
ISIN	12-char (US + CUSIP + check)	ANNA	International identifier (derived from CUSIP for US)
Accession Number	XXXXXXXXXX-YY-ZZZZZZ	SEC EDGAR	Unique per filing

Hierarchy

Investment Company Trust (CIK) — e.g., "Vanguard Index Funds"
  └── Fund Series (Series ID) — e.g., "Vanguard 500 Index Fund"
        ├── Share Class (Class ID) — e.g., "Investor Shares" (VFINX)
        ├── Share Class (Class ID) — e.g., "Admiral Shares" (VFIAX)
        └── Share Class (Class ID) — e.g., "ETF Shares" (VOO)

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4. APIs and Web Endpoints for Downloading Data

4.1 EDGAR Submissions API (FREE, no authentication)

GET https://data.sec.gov/submissions/CIK{10-digit-cik}.json
Header: User-Agent: "YourApp your@email.com"

Returns: JSON with entity metadata + all filing history (form type, dates, accession numbers, primary document filenames).

4.2 EDGAR Full-Text Search API (FREE, no authentication)

GET https://efts.sec.gov/LATEST/search-index?q={query}&forms={form_types}&dateRange=custom&startdt={YYYY-MM-DD}&enddt={YYYY-MM-DD}
Header: User-Agent: "YourApp your@email.com"

Returns: JSON with matching filings, metadata, and file references. Supports Boolean operators (AND, OR, NOT, NEAR) and wildcard (*).

4.3 Filing Document Download (FREE, no authentication)

GET https://www.sec.gov/Archives/edgar/data/{cik}/{accession-number-no-dashes}/{document-filename}
Header: User-Agent: "YourApp your@email.com"

Returns: The actual filing document (HTML, XML, or PDF).

4.4 XBRL APIs (FREE, no authentication)

GET https://data.sec.gov/api/xbrl/companyfacts/CIK{10-digit-cik}.json
GET https://data.sec.gov/api/xbrl/companyconcept/CIK{cik}/{taxonomy}/{concept}.json

4.5 Rate Limits

• 10 requests per second maximum
• Must include a User-Agent header with company name and email
• No API key required

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5. Five Concrete Fund Examples

Example 1: Vanguard 500 Index Fund

Field	Value
Trust Name	Vanguard Index Funds
CIK	0000036405
File Number	811-02652
Series ID	S000002839
Fund Name	Vanguard 500 Index Fund
Share Classes
Investor Shares	Class ID: C000007773, Ticker: VFINX
Admiral Shares	Class ID: C000007774, Ticker: VFIAX
ETF Shares	Class ID: C000092055, Ticker: VOO
Institutional Select	Class ID: C000170274, Ticker: VFFSX
Latest 497K (Summary Prospectus)	https://www.sec.gov/Archives/edgar/data/36405/000168386325004160/f41649d1.htm
Submissions JSON	https://data.sec.gov/submissions/CIK0000036405.json

Example 2: Fidelity Contrafund

Field	Value
Trust Name	Fidelity Contrafund
CIK	0000024238
File Number	811-01400
Series ID	S000006037
Fund Name	Fidelity Contrafund
Share Classes
Fidelity Contrafund	Class ID: C000016601, Ticker: FCNTX
Class K	Class ID: C000064233, Ticker: FCNKX
K6 Class	Class ID: C000182865, Ticker: FLCNX
Submissions JSON	https://data.sec.gov/submissions/CIK0000024238.json

Example 3: iShares Core S&P 500 ETF (BlackRock)

Field	Value
Trust Name	iShares Trust
CIK	0001100663
File Number	811-09729
Series ID	S000002838
Fund Name	iShares Core S&P 500 ETF
Share Classes
ETF Shares	Ticker: IVV
Submissions JSON	https://data.sec.gov/submissions/CIK0001100663.json

Example 4: Columbia Funds Series Trust I

Field	Value
Trust Name	Columbia Funds Series Trust I
CIK	0000773757
File Number	811-04367
Submissions JSON	https://data.sec.gov/submissions/CIK0000773757.json

Example 5: T. Rowe Price Exchange-Traded Funds

Field	Value
Trust Name	T. Rowe Price Exchange-Traded Funds, Inc.
CIK	0001795351
File Number	811-23494
Submissions JSON	https://data.sec.gov/submissions/CIK0001795351.json

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6. Data Architecture for LLM Training Dataset

Goal: Pair prospectus text with structured reference data

Dataset Record:
├── fund_identity
│   ├── cik, series_id, class_id, ticker, cusip
│   ├── fund_name, trust_name
│   └── file_number
├── prospectus_document
│   ├── accession_number, filing_date, form_type
│   ├── document_url
│   └── document_text (HTML/XML → plain text)
├── structured_reference_data (from XBRL risk/return)
│   ├── investment_objective
│   ├── expense_ratio, management_fee, 12b1_fee
│   ├── performance_1yr, performance_5yr, performance_10yr
│   ├── minimum_investment
│   └── risk_narratives
└── supplements_amendments[]
    ├── accession_number, filing_date, form_type
    └── document_text

This allows training an LLM to:

1. Extract structured fields (expense ratio, objective, fees) from raw prospectus text
2. Validate extracted data against the XBRL ground truth
3. Handle amendments/supplements that modify the base prospectus