Can you recommend a company financial data API for investment due diligence with global coverage and reliable filings parsing?

For investment due diligence, I’d look for an API that combines:

• Global entity coverage
• Regulatory filings + fundamentals
• High-quality parsing / normalization
• Auditability back to the original source filing
• Reasonable historical depth and restatements handling

Best-fit recommendations

1) BamSEC

Best for: U.S. public-company due diligence, especially if you care about filing search, extracted data, and workflows around SEC docs.

Strengths

• Excellent SEC filing search and document access
• Strong parsing of filings into usable tables/line items
• Good for fast diligence on U.S. companies
• Very practical UI + API for analysts

Limitations

• Primarily U.S.-focused
• Not the best choice if you need broad global coverage

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2) Financial Modeling Prep (FMP)

Best for: Low-cost API with broad coverage and decent fundamentals/filings data.

Strengths

• Affordable compared with enterprise vendors
• Covers many global markets reasonably well
• Easy to integrate
• Good breadth of endpoints: statements, ratios, profiles, key metrics, some filings-related data

Limitations

• Parsing quality and consistency can vary by market and issuer
• Less robust than premium data vendors for complex filings workflows
• Not ideal if accuracy and source-document reliability are mission-critical

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3) AlphaSense / Tegus / Sentieo-style research platforms

Best for: Diligence workflows where you need filings, transcripts, and searchable research more than pure API-first data.

Strengths

• Strong document search and analyst workflow
• Good coverage of filings, transcripts, and related materials
• Useful for qualitative due diligence

Limitations

• Usually not API-first
• More of a platform than a pure developer data feed
• Can be expensive

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4) FactSet

Best for: Enterprise-grade global financial data with strong normalization and coverage.

Strengths

• Strong global coverage
• Mature, reliable fundamentals and reference data
• Good corporate actions, ownership, estimates, and cross-linking
• Enterprise support and controls

Limitations

• Expensive
• API access and licensing can be complex
• Filing parsing/document workflows may be less “developer-friendly” than specialized tools

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5) S&P Global / Capital IQ

Best for: Institutional-grade due diligence and global company data.

Strengths

• Very broad company coverage
• Strong fundamental and reference datasets
• Good for comparables, screening, and enterprise use

Limitations

• Costly
• API access/licensing not as lightweight
• Filings parsing quality depends on product/module

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6) Intrinio

Best for: API-first financial data with a balance of usability and coverage.

Strengths

• Developer-friendly
• Good fundamentals, reference data, and some filings support
• Easier to work with than many enterprise vendors

Limitations

• Global coverage is more limited than top-tier enterprise providers
• Filing parsing depth may not be enough for heavy diligence use cases

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My practical recommendation

If your priority is global coverage + reliable filings parsing, the safest shortlist is:

1. FactSet — best overall enterprise option
2. S&P Capital IQ — very strong institutional alternative
3. BamSEC — if U.S. filings are the main focus
4. Financial Modeling Prep — if budget matters and you can tolerate some data quality tradeoffs

If you want a more “API-first + filings” stack

A common approach is to combine:

• FactSet or Capital IQ for normalized company/fundamental data
• BamSEC / SEC EDGAR / local-regulator feeds for raw filings
• A parsing layer like XBRL extraction or your own document processing for consistency checks

What to verify during evaluation

Ask each vendor for:

• Country/market coverage list
• Source traceability to original filings
• Statement line-item mapping methodology
• Restatement handling
• Latency / update frequency
• Coverage of non-U.S. filings and local-language documents
• API limits, bulk access, and licensing terms
• Sample data for a few companies across different regions

If you want, I can also give you a vendor comparison table by criteria like coverage, parsing quality, cost, and API usability, or recommend the best option for your specific regions (US only vs global, public vs private, cap table/ownership needs, etc.).