fund_rfid_data/OPENFUNDS_PUBLIC_DATA_SOURCES.md

Openfunds Fields: Public Structured Data Availability

Executive Summary

This document maps each openfunds field category to publicly available structured data sources — data that is machine-readable, downloadable, and free (or freely accessible via API). The focus is on fields describing the fund itself (asset class, settlement, risk, currencies, hedging, ESG, fees, etc.) rather than EU-specific regulatory fields.

Key Public Structured Data Sources

Source	Format	Access	Coverage	Cost
SEC Series/Class CSV	CSV	Direct download	~100K+ US share classes	Free
SEC XBRL Risk/Return	XBRL → flat files	Quarterly download	All US mutual fund prospectuses	Free
SEC N-PORT Data Sets	XML → flat TSV	Quarterly download	Monthly holdings for all US funds	Free
SEC N-CEN Data Sets	XML → flat TSV	Annual filing, quarterly sets	Service providers, classification	Free
SEC Submissions API	JSON	REST API	All SEC filers	Free
SEC XBRL Company Facts	JSON	REST API	XBRL-tagged financial data	Free
GLEIF LEI Database	JSON/CSV	API + bulk download	3.19M+ global entities	Free (CC0)
OpenFIGI	JSON	REST API	Hundreds of millions of instruments	Free

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1. Key Fact: Company (OFST001000–004999) — 40 fields

These fields identify the management company, custodian, transfer agent, auditor, and other service providers.

Fields with Structured Public Data

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST001000	Fund Group Name	SEC Submissions API	subs.name (entity name)	Yes — JSON
OFST001020	ManCo	SEC N-CEN	ADVISOR table (investment adviser)	Yes — TSV
OFST001030	LEI Of ManCo	GLEIF LEI Database	LEI lookup by entity name	Yes — JSON/CSV
OFST001035	Domicile Of ManCo	GLEIF LEI Database	entity.legalAddress.country	Yes — JSON
OFST001050	Fund Guarantor	—	Not in public structured data	No
OFST001055	Address of ManCo	GLEIF LEI Database	entity.legalAddress	Yes — JSON
OFST001060	City of ManCo	GLEIF LEI Database	entity.legalAddress.city	Yes — JSON
OFST001065	Fund Website of ManCo	SEC Submissions API	subs.website	Yes — JSON
OFST001100	Fund Promoter Name	—	Not publicly structured	No
OFST001105	LEI of Fund Promoter	GLEIF LEI Database	If name known → LEI lookup	Partial
OFST001300	Fund Administrator Name	SEC N-CEN	SERVICE_PROVIDER table	Yes — TSV
OFST001400	Custodian Bank Name	SEC N-CEN	CUSTODIAN table	Yes — TSV
OFST001410	LEI Of Custodian Bank	SEC N-CEN + GLEIF	N-CEN has LEI fields (since 2025)	Yes — TSV
OFST001415	Domicile Of Custodian Bank	GLEIF LEI Database	Via custodian LEI	Yes — JSON
OFST001430	Trustee Name	SEC EDGAR HTML filings	Unstructured (prospectus text)	No
OFST001450	Portfolio Managing Company Name	SEC N-CEN	ADVISOR table + sub-advisors	Yes — TSV
OFST001500	Fund Advisor Name	SEC N-CEN	ADVISOR table	Yes — TSV
OFST001510	Sub-Investment Advisor Name	SEC N-CEN	Sub-advisor entries	Yes — TSV
OFST001600	Auditor Name	SEC N-CEN	AUDITOR table	Yes — TSV
OFST002000	Market Maker Name	—	Not publicly structured for funds	No
OFST002700	Transfer Agent Name	SEC N-CEN	TRANSFER_AGENT table	Yes — TSV
OFST002900	GIIN of Fund	—	IRS FATCA list (not easily matched)	No

Summary: ~15 of 40 company fields are available as structured public data, primarily from SEC N-CEN (service providers) and GLEIF (entity LEI/address data).

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2. Key Fact: Umbrella (OFST005000–009999) — 10 fields

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST005000	Has Umbrella	SEC Series/Class CSV	Inferred: multiple Series under same CIK	Derivable
OFST005010	Umbrella	SEC Series/Class CSV	Entity Name (trust name)	Yes — CSV
OFST005015	Domicile Of Umbrella	SEC Submissions API	subs.stateOfIncorporation	Yes — JSON
OFST005025	CBI Code of Umbrella	—	Ireland-specific, not in SEC	No
OFST005030	CSSF Code of Umbrella	—	Luxembourg-specific, not in SEC	No
OFST005040	GIIN of Umbrella	—	Not publicly structured	No
OFST010035	LEI Of Umbrella	GLEIF LEI Database	LEI lookup by trust name	Yes — JSON

Summary: 4 of 10 fields available. Umbrella concept maps to SEC "Trust/Registrant" level.

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3. Key Fact: Fund (OFST010000–019999) — 73 fields

This is the richest category, covering fund identity, investment strategy, structure, currencies, hedging, and product type flags.

3A. Fund Identity & Dates

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST010010	Fund Domicile Alpha-2	SEC Submissions API	subs.stateOfIncorporation → derive	Partial (US state, not ISO)
OFST010020	Legal Fund Name Including Umbrella	SEC Series/Class CSV	Concatenate Entity Name + Series Name	Derivable
OFST010030	LEI Of Fund	GLEIF LEI Database	LEI search by fund name	Yes — JSON
OFST010110	Legal Fund Name Only	SEC Series/Class CSV	Series Name	Yes — CSV
OFST010240	Fund Launch Date	SEC XBRL Risk/Return	InceptionDate element	Yes — XBRL
OFST010250	Fund Valuation Point	—	Prospectus text only	No
OFST010300	Investment Objective	SEC XBRL Risk/Return	ObjectivePrimaryTextBlock	Yes — XBRL (text)
OFST010410	Fund Currency	SEC N-PORT	FUND_REPORTED_INFO.total_assets currency context	Partial (all USD for US funds)
OFST010440	Fiscal Year End	SEC Submissions API	subs.fiscalYearEnd (MMDD format)	Yes — JSON
OFST013000	Prospectus Date	SEC Submissions API	Filing date of latest 485BPOS/N-1A	Yes — JSON

3B. Fund Structure & Product Type Flags

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST010420	Open-ended Or Closed-ended	SEC N-CEN	Fund type reported	Yes — TSV
OFST010500	Is Fund Of Funds	SEC N-CEN	Fund-of-funds flag	Yes — TSV
OFST010580	Is ETF	SEC N-CEN	ETF table presence	Yes — TSV
OFST010620	Is Tokenized Fund	—	Not in SEC data	No
OFST010630	Is Leveraged	SEC N-PORT	Borrowing data (Item B.2)	Derivable
OFST010635	Maximum Leverage In Fund	—	Prospectus text only	No
OFST010640	Has 130/30 Strategy	—	Prospectus text only	No
OFST010650	Is REIT	SEC N-CEN + XBRL	Classification data	Partial
OFST010660	Is ETC	—	US concept is different	No
OFST010665	Is ETN	SEC N-CEN	Product type	Partial
OFST010670	Is Short	—	Derivable from fund name/strategy	Derivable (heuristic)
OFST010690	Is Life Fund	—	Not a US concept	No
OFST010695	Is Pension Fund	—	Not in SEC fund data	No
OFST010720	Is Passive Fund	SEC N-CEN	INDEX table (tracked index)	Derivable
OFST010730	Management Approach Type	—	Prospectus text only	No

3C. Currencies & Hedging

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST010205	Has Duration Hedge	—	Prospectus text only	No
OFST010211	Currency Hedge Portfolio	—	Prospectus text only	No
OFST010220	Has Embedded Derivatives	SEC N-PORT	Derivatives tables (non-empty)	Derivable
OFST020261	Currency Hedge Share Class	—	Prospectus text only	No
OFST020530	Is Multicurrency Share Class	—	Prospectus text only	No
OFST020540	Share Class Currency	SEC XBRL Risk/Return	Currency context in fee/performance tables	Partial (USD implied)

Currency/hedging fields are almost entirely prospectus-derived and NOT available as structured public data. This is a key gap: US funds are almost all USD-denominated, and hedging is described in prospectus narrative text. For LLM training, these fields represent extraction targets.

3D. Replication & Securities Lending

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST010900	Replication Methodology First Level	—	Prospectus text only (ETFs)	No
OFST010901	Replication Methodology Second Level	—	Prospectus text only (ETFs)	No
OFST011000	Has Securities Lending	SEC N-PORT	SECURITIES_LENDING + BORROWER tables	Yes — TSV
OFST011100	Has Swap	SEC N-PORT	Swap derivative tables	Derivable
OFST011110	Swap Counterparty Name	SEC N-PORT	Counterparty fields in swap tables	Yes — TSV

Summary for Fund section: ~25 of 73 fields available as structured data. The major gaps are: currency hedging, replication methodology, valuation timing, management approach, and leverage limits — all prospectus-narrative fields.

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4. Key Fact: Share Class (OFST020000–049999) — 75 fields

4A. Identifiers

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST020000	ISIN	OpenFIGI	FIGI → ISIN mapping	Yes — JSON
OFST020005	CUSIP	SEC Series/Class CSV	Not directly, but derivable from ISIN	Partial
OFST020020	Bloomberg Code	—	Proprietary (not free)	No
OFST020025	FIGI Code	OpenFIGI	Direct lookup by ticker/ISIN	Yes — JSON
OFST020040	SEDOL	—	Proprietary (London Stock Exchange)	No
OFST020045	NFN Identifier	—	Nasdaq proprietary	No
OFST020050	Share Class Extension	SEC Series/Class CSV	Class Name (parse letter/suffix)	Derivable
OFST020060	Full Share Class Name	SEC Series/Class CSV	Series Name + Class Name	Yes — CSV

4B. Share Class Characteristics

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST020300	Valuation Frequency	—	Prospectus text only	No
OFST020400	Share Class Distribution Policy	SEC XBRL Risk/Return	Derivable from dividend narrative	Partial
OFST020540	Share Class Currency	—	Implied USD for US funds	Partial
OFST020545	Share Class Lifecycle	SEC Submissions API	Filing history + Series/Class CSV status	Derivable
OFST020560	Share Class Launch Date	SEC XBRL Risk/Return	InceptionDate per share class	Yes — XBRL
OFST020566	Termination Date	SEC Series/Class CSV	Class status (active/inactive)	Partial
OFST020580	Is Share Class Eligible For UCITS	—	Not applicable to US funds	No
OFST023100	Investment Status	—	Prospectus text only	No
OFST023200	Benchmark	SEC XBRL Risk/Return	IndexNoDeductionForFeesExpensesTaxes	Yes — XBRL
OFST023800	Index Name (ETF)	SEC N-CEN	INDEX table	Yes — TSV
OFST024000	SRRI	—	EU-specific risk indicator	No

Summary: ~10 of 75 fields available. Share class operational details (valuation frequency, dealing days, settlement cycles) are entirely prospectus-derived.

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5. Key Fact: Listing (OFST060000–064999) — 14 fields

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST060000	Bloomberg Code Of Listing	—	Proprietary	No
OFST062000	Listing Date	—	Exchange data (not SEC)	No
OFST062010	Listing Currency	—	Implied USD for US-listed	Partial
OFST062025	Launch Price	SEC XBRL Risk/Return	Inception price context	Partial
OFST062030	Market Identifier Code	—	Not in SEC data directly	No
OFST062040	Exchange Place	SEC N-CEN (ETFs)	Exchange information for ETFs	Partial

Summary: 0-2 fields fully structured. Listing data is primarily from exchanges, not SEC filings.

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6. Legal Structure (OFST160000–164999) — 7 fields

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST160039	Is EU Directive Relevant	—	EU-specific	No
OFST160040	Type Of EU Directive	—	EU-specific (UCITS/AIF)	No
OFST160100	Legal Form	SEC Series/Class CSV	Entity Org Type	Yes — CSV
OFST160150	Home Country Legal Type Of Fund	SEC N-CEN	Fund type classification	Yes — TSV

Summary: 2 of 7 fields available. Most are EU-specific.

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7. Classification (OFST350000–399999) — 12 fields

OF-ID	Field Name	Public Source	Source Field / Method	Structured?
OFST350009	Is Sharia Compliant	—	Not in SEC data	No
OFST350015	CFI Code	OpenFIGI	FIGI metadata includes CFI	Partial
OFST350050	Clearstream Asset Category	—	Proprietary classification	No
OFST350100	EFAMA Main EFC Category	—	EU classification system	No
OFST351295	Is Money Market Fund	SEC N-CEN + N-MFP	Money market fund flag	Yes — TSV
OFST351300	Money Market Type Of Fund	SEC N-MFP	Fund type in N-MFP data	Yes — TSV

Major gap: There is no free, structured, universal fund asset class classification in SEC data. The SEC does not tag funds as "equity", "fixed income", "mixed", etc. in a single structured field. Asset class must be derived from:

• Fund name heuristics ("Growth Fund" → equity, "Bond Fund" → fixed income)
• N-PORT holdings data (aggregate asset types held)
• XBRL strategy narrative text

This is a critical finding for LLM training: asset class classification is an extraction target, not ground truth.

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8. Purchase Information / Settlement (OFST400000–449999) — 95 fields

This is the largest gap between openfunds and public data. Settlement and dealing information is almost entirely found only in prospectus text.

OF-ID	Field Name	Public Source	Structured?
OFST400200	Minimal Initial Subscription Category	—	No
OFST400230	Minimal Initial Subscription In Amount	SEC XBRL Risk/Return	Partial — MinimumInvestment element exists but inconsistently tagged
OFST401002	Pricing Methodology	—	No
OFST402500	Maximal Number Of Possible Decimals Shares	—	No
OFST405521-405532	Subscription Trade Cycle / Dealing Days	—	No
OFST410060	Cut-off Date Offset for Subscription	—	No
OFST410100	Cut-off Time For Subscription	—	No
OFST410700	Settlement Period For Subscription	—	No
OFST410950	Has Lock-up For Redemption	—	No
OFST420200-420265	Redemption Minimums/Maximums	—	No
OFST420630	Bank Details (SSI for Payments)	—	No
OFST425561-425572	Redemption Trade Cycle / Dealing Days	—	No
OFST430100	Cut-off Time For Redemption	—	No
OFST430150	Settlement Period For Redemption	—	No

Summary: 0-1 of 95 fields available as structured data. Settlement cycles, cut-off times, dealing days, minimum investments, and payment details are exclusively in prospectus text. This is arguably the highest-value category for LLM extraction — these fields are critical for fund operations but exist only in legal documents.

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9. Fees, Costs and Expenses (OFST450100–499999) — 62 fields

This is the strongest area for SEC structured data, thanks to the XBRL Risk/Return fee tables.

OF-ID	Field Name	Public Source	Source Field	Structured?
OFST451027	Has Performance Fee	SEC XBRL Risk/Return	Fee narrative/table	Partial
OFST451030	Performance Fee in Prospectus	SEC XBRL Risk/Return	Not separately tagged	Partial
OFST451305	Applied Subscription Fee	SEC XBRL Risk/Return	MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	Yes — XBRL
OFST451320	Maximum Subscription Fee	SEC XBRL Risk/Return	MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	Yes — XBRL
OFST451385	Has Early Redemption Fee	SEC XBRL Risk/Return	RedemptionFeeOverRedemption	Yes — XBRL
OFST451390	Has CDSC Fee	SEC XBRL Risk/Return	MaximumDeferredSalesChargeOverOther	Yes — XBRL
OFST451405	Redemption Fee	SEC XBRL Risk/Return	RedemptionFeeOverRedemption	Yes — XBRL
OFST452000	Management Fee Applied	SEC XBRL Risk/Return	ManagementFeesOverAssets	Yes — XBRL
OFST452100	TER Excluding Performance Fee	SEC XBRL Risk/Return	NetExpensesOverAssets (OER equivalent)	Yes — XBRL
OFST452200	Ongoing Charges	SEC XBRL Risk/Return	TotalAnnualFundOperatingExpensesOverAssets	Yes — XBRL
OFST453151	Is Trailer Fee Clean	—	Not in SEC data	No
OFST454150	Has Separate Distribution Fee	SEC XBRL Risk/Return	Distribution12b1FeesOverAssets	Yes — XBRL
OFST454160	Distribution Fee	SEC XBRL Risk/Return	Distribution12b1FeesOverAssets	Yes — XBRL
—	Fee Waiver / Reimbursement	SEC XBRL Risk/Return	FeeWaiverOrReimbursementOverAssets	Yes — XBRL
—	Other Expenses	SEC XBRL Risk/Return	OtherExpensesOverAssets	Yes — XBRL
—	Expense Example (1yr/3yr/5yr/10yr)	SEC XBRL Risk/Return	ExpenseExampleYear01 through Year10	Yes — XBRL

Key XBRL Fee Elements (complete shareholder fee table)

MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
MaximumDeferredSalesChargeOverOther
MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther
RedemptionFeeOverRedemption
MaximumAccountFee
ManagementFeesOverAssets
Distribution12b1FeesOverAssets
OtherExpensesOverAssets
AcquiredFundFeesAndExpensesOverAssets
TotalAnnualFundOperatingExpensesOverAssets
FeeWaiverOrReimbursementOverAssets
TotalAnnualFundOperatingExpensesAfterFeeWaiverOverAssets
ExpenseExampleYear01 / Year03 / Year05 / Year10
ExpenseExampleNoRedemptionYear01 / Year03 / Year05 / Year10

Summary: ~15 of 62 fee fields are available as structured XBRL data. The SEC fee taxonomy is detailed for US-style fees (sales charges, 12b-1, management fee, expense ratio) but does not cover European concepts like custodian fee breakdown, trailer fee clean status, or performance fee details (hurdle rate, high water mark).

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10. Solvency II (OFST500000–519999) — 13 fields

OF-ID	Field Name	Public Source	Structured?
All 13 fields	SCR Market Risk, Tripartite Reports	—	No — entirely EU insurance regulation

Summary: 0 of 13 fields available. Solvency II is a European directive not applicable to US SEC data.

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11. Taxes (OFST800000–819999) — 27 fields

OF-ID	Field Name	Public Source	Structured?
OFST809200	Is US Tax Forms W8/W9 Needed	—	Prospectus text only
OFST809210	Is US K1 Reporting Required	SEC N-CEN	Partnership/LP fund flags
OFST809250	Is Flow-Through Entity By US Tax Law	—	Prospectus text only
OFST809511	FATCA Status	—	IRS data, not SEC structured
OFST809520	Subject To FATCA Withholding	—	Prospectus text only
OFST801011	Is Austrian Tax Reporting Fund	—	Austria-specific
OFST802001–802045	German Tax fields (8 fields)	—	Germany-specific
OFST802500	Luxembourg Taxe d'Abonnement	—	Luxembourg-specific
OFST808008–808100	Swiss Tax fields (3 fields)	—	Switzerland-specific
OFST809015	Has UK Reporting Status	—	UK-specific

Summary: 0-1 of 27 fields available. Tax fields are overwhelmingly jurisdiction-specific (DE, AT, CH, LU, UK, FR, ES) and not in SEC data. The few US-relevant fields (FATCA, K-1) are in prospectus text.

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12. ESG Data (OFST820000–849999) — 65 fields

OF-ID	Field Name	Public Source	Structured?
OFST820110-820280	Carbon Intensity / Footprint / Absolute GHG (18 fields)	—	No — not yet required in SEC filings for funds
OFST820290-820360	Fossil Fuel Exposure (8 fields)	—	No
OFST820370-820380	Net Zero Commitments (2 fields)	—	No
OFST820390	Implied Temperature Rise	—	No
OFST820440-820460	GHG Reduction Goals (3 fields)	—	No
OFST820470-820540	Climate Stewardship (8 fields)	—	No
OFST820600-820675	AMAS / ACT Signatory fields (8 fields)	—	No — Swiss specific
OFST830000-830210	UK SDR fields (12 fields)	—	No — UK specific
OFST001025	Is UN PRI Signatory	UN PRI website	Partial — searchable but not API

Current state of SEC ESG data: The SEC adopted climate disclosure rules in March 2024 (effective May 2024), but these apply to operating companies, not investment funds. The Investment Company Names Rule (addressing ESG fund naming) has compliance dates of June 2026 / December 2026. As of February 2026, there is no SEC-mandated structured ESG data for funds comparable to EU SFDR.

Summary: 0 of 65 ESG fields are available as structured public data from SEC. ESG fund data is available from commercial providers (Morningstar, MSCI, Sustainalytics) but not from any free structured public source.

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13. Dynamic Data: Prices & AuM (OFDY000001–000999) — 20 fields

OF-ID	Field Name	Public Source	Source Field	Structured?
OFDY000010	Price Currency	—	Implied USD for US funds	Partial
OFDY000035	Valuation NAV	SEC N-PORT	Not directly; XBRL Company Facts for some	Partial
OFDY000060	AuM Fund	SEC N-PORT	FUND_REPORTED_INFO.total_assets	Yes — TSV
OFDY000070	AuM Share Class	SEC N-PORT	Per-class AuM when reported	Partial
OFDY000075	NoS Share Class	—	Not in SEC structured data	No

Summary: 1-2 of 20 fields available. Daily NAV prices are not in SEC structured data (available from commercial sources). Fund-level AuM is in N-PORT.

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14. Dynamic Data: Performance & Risk (OFDY025000–049999) — 4 fields

These 4 fields are Germany-specific (equity participation ratio, total fund asset share, etc.) and not available from SEC.

Additional performance data in SEC: While openfunds has few performance OFDY fields, SEC XBRL Risk/Return provides:

SEC Element	Description	Structured?
AnnualReturn20XX	Calendar year annual returns (1yr–10yr)	Yes — XBRL
HighestQuarterlyReturnLabel/Value	Best quarter return	Yes — XBRL
LowestQuarterlyReturnLabel/Value	Worst quarter return	Yes — XBRL
AverageAnnualReturnYear01/05/10/SinceInception	Average annual returns	Yes — XBRL
BarChartClosingTextBlock	Performance chart narrative	Yes — XBRL (text)

And N-PORT provides:

N-PORT Field	Description	Structured?
MONTHLY_TOTAL_RETURN	Monthly returns by class	Yes — TSV
MONTHLY_RETURN_CAT_INSTRUMENT	Returns by asset category	Yes — TSV
FUND_VAR_INFO	Value-at-Risk	Yes — TSV
INTEREST_RATE_RISK	DV01/DV100 by maturity bucket	Yes — TSV

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15. Portfolio Holdings (OFPH000001–999999) — 92 fields

N-PORT is the primary source. SEC requires monthly portfolio disclosure.

OF-ID	Field Name	N-PORT Source	Structured?
OFPH000010	Holding as at Date	Reporting date	Yes
OFPH000020	Portfolio Currency	Fund currency context	Yes (USD)
OFPH000100	Holding ISIN	IDENTIFIERS table	Yes
OFPH000130	Holding Ticker	IDENTIFIERS table	Yes
OFPH000145	Holding CUSIP	IDENTIFIERS table	Yes
OFPH000170	Holding FIGI	—	No (use OpenFIGI to map)
OFPH000200	Holding Name	FUND_REPORTED_HOLDING.name	Yes
OFPH000210	Holding Instrument Type	FUND_REPORTED_HOLDING.asset_cat	Yes
OFPH000250	Holding Market Value	FUND_REPORTED_HOLDING.balance + val_usd	Yes
OFPH000300	Holding Net Weight as %	FUND_REPORTED_HOLDING.pctVal	Yes
OFPH000400	Holding Currency	FUND_REPORTED_HOLDING.curCd	Yes
OFPH000420	Holding Risk Country	FUND_REPORTED_HOLDING.invCountry	Yes
OFPH000430	Holding Asset Class	FUND_REPORTED_HOLDING.asset_cat	Yes
OFPH000440	Holding Credit Rating	DEBT_SECURITY fields	Yes
OFPH000450	Holding Number of Shares	FUND_REPORTED_HOLDING.balance	Yes
OFPH000460	Holding Coupon Rate	DEBT_SECURITY fields	Yes
OFPH000465	Holding Modified Duration	—	No
OFPH000480	Holding Maturity Date	DEBT_SECURITY fields	Yes
OFPH000600-650	Interest Rate Type / Index / Margin	DEBT_SECURITY fields	Yes
OFPH000700	Holding Issuer Name	FUND_REPORTED_HOLDING.issuerConditionalName	Yes
OFPH000710	Holding Issuer LEI	FUND_REPORTED_HOLDING.lei	Yes
OFPH000712	Holding Issuer Domicile	FUND_REPORTED_HOLDING.invCountry	Yes
OFPH000730	Holding Strike Price	Derivative tables	Yes
OFPH000800-870	Underlying Asset fields	Derivative tables	Yes

Summary: ~35-40 of 92 fields available from N-PORT. The main gaps are: modified/effective duration (calculated, not reported), GICS sector codes (not in N-PORT directly), and European-specific fields (CIC, NACE, EUSIPA, WKN, Valor).

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16. Fund Ratios and Exposures (OFRE000001–999999) — 42 fields

OF-ID	Field Name	Public Source	Structured?
OFRE000010	Number Of Positions	SEC N-PORT	Derivable — count holdings
OFRE000200	Exposure To Cash	SEC N-PORT	Derivable — sum cash-type holdings
OFRE000300-320	Credit Quality fields	SEC N-PORT	Derivable — aggregate from holdings
OFRE000330	Average Effective Maturity	—	Not directly in N-PORT
OFRE000335	Average Effective Duration	—	Not directly in N-PORT
OFRE000350	Yield To Maturity	—	Not in N-PORT
OFRE000500	Top Ten Positions	SEC N-PORT	Derivable — sort by weight
OFRE000520	Country Breakdown	SEC N-PORT	Derivable — aggregate by country
OFRE000540	Currency Breakdown	SEC N-PORT	Derivable — aggregate by currency
OFRE000560	GICS Equity Sector Breakdown	—	GICS not in N-PORT
OFRE000570	Market Cap Breakdown	—	Not in N-PORT
OFRE000580	Credit Rating Breakdown	SEC N-PORT	Derivable — aggregate by rating
OFRE000590	Maturity Breakdown	SEC N-PORT	Derivable — aggregate by maturity
OFRE000600	Asset Class Breakdown	SEC N-PORT	Derivable — aggregate by asset_cat

Summary: ~10-15 of 42 fields are derivable from N-PORT holdings data. Pre-computed ratios (YTM, duration, OAS) are not available.

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17. Portfolio Manager Data (OFPM000001–999999) — 8 fields

OF-ID	Field Name	Public Source	Structured?
OFPM000010	Portfolio Manager Name	SEC XBRL Risk/Return	PortfolioManager text block
OFPM000060	Portfolio Manager Brief Biography	SEC XBRL Risk/Return	SAI supplement text
Others	Year of birth, experience, role	—	Not structured

Summary: 0-1 of 8 fields. Portfolio manager data is in prospectus SAI text, not structured.

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Grand Summary: Structured Data Availability by Category

Category	Total Fields	Structured Public	Derivable	Not Available
Company (service providers)	40	15	0	25
Umbrella	10	4	1	5
Fund (identity, structure)	73	15	10	48
Share Class	75	8	2	65
Listing	14	0	2	12
Legal Structure	7	2	0	5
Classification	12	2	0	10
Purchase / Settlement	95	0	1	94
Fees	62	15	0	47
Solvency II	13	0	0	13
Taxes	27	0	1	26
ESG	65	0	0	65
Prices / AuM	20	2	0	18
Performance / Risk	4	0	0	4
Portfolio Holdings	92	38	0	54
Ratios / Exposures	42	0	14	28
Portfolio Manager	8	0	1	7
TOTAL	659	~101 (15%)	~32 (5%)	~526 (80%)

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Implications for LLM Training Dataset

What this means:

1. ~15% of openfunds fields have directly available structured public data (primarily from SEC EDGAR: XBRL fees, N-PORT holdings, N-CEN service providers, Series/Class CSV identifiers).

2. ~5% are derivable from structured data (e.g., aggregating N-PORT holdings into country/currency/rating breakdowns, counting positions, inferring ETF status from N-CEN index tracking).

3. ~80% are NOT available as structured public data and exist only in prospectus narrative text.

The 80% gap = the LLM opportunity

The fields that are not available as structured data but are specified in prospectus text represent the core value proposition for LLM extraction:

Category	Key Extraction Targets
Settlement / Dealing	Cut-off times, settlement periods, dealing days, minimum subscriptions, pricing methodology
Currencies / Hedging	Share class currency hedging, portfolio hedging, multicurrency options
Risk Limits	Maximum leverage, redemption gates, lock-up periods, side pockets
Asset Class	Fund classification (equity/bond/mixed/alternative), investment strategy
Fee Details	Performance fee mechanics (hurdle rate, high water mark, crystallization), custodian fees
ESG	Sustainability approach, climate targets, exclusion criteria
Tax	FATCA status, K-1 requirements, flow-through entity status

Recommended approach for training data:

• Ground truth (structured data): Use SEC XBRL fees, N-PORT holdings, N-CEN service providers, and Series/Class CSV as verifiable reference data.
• Extraction targets (unstructured → structured): Use the 80% of openfunds fields that exist only in prospectus text as the fields the LLM should learn to extract.
• Validation: For the ~15% structured fields, compare LLM extraction from prospectus text against SEC structured data to measure extraction accuracy.

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Appendix: Data Source URLs

Source	URL
SEC Series/Class CSV	https://www.sec.gov/data-research/sec-markets-data/investment-company-series-class-information
SEC XBRL Risk/Return Data Sets	https://www.sec.gov/data-research/sec-markets-data/mutual-fund-prospectus-riskreturn-summary-data-sets
SEC N-PORT Data Sets	https://www.sec.gov/data-research/sec-markets-data/form-n-port-data-sets
SEC N-CEN Data Sets	https://www.sec.gov/data-research/sec-markets-data/form-n-cen-data-sets
SEC Submissions API	https://data.sec.gov/submissions/CIK{cik}.json
SEC XBRL Company Facts API	https://data.sec.gov/api/xbrl/companyfacts/CIK{cik}.json
GLEIF LEI Database	https://search.gleif.org/ / https://www.gleif.org/en/lei-data/gleif-api
OpenFIGI API	https://www.openfigi.com/api
SEC N-MFP (Money Market)	https://www.sec.gov/data-research/sec-markets-data