VOL. XCIV, NO. 247

★ FINANCIAL TOOLS & SERVICES DIRECTORY ★

PRICE: 5 CENTS

Sunday, October 5, 2025

View OpenCorporatesView PCAOB AuditorSearchBack to Home

Head-to-head

OpenCorporates vs PCAOB AuditorSearch comparison

Compare pricing, supported platforms, categories, and standout capabilities to decide which tool fits your workflow.

Quick takeaways

OpenCorporates adds Data APIs, and Other coverage that PCAOB AuditorSearch skips.

OpenCorporates highlights: 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links., Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day)., and OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers..

PCAOB AuditorSearch is known for: Searchable by engagement partner, audit firm, or public company, with support for company name, CIK, ticker, and firm identifiers., Displays engagement partner details, audit firm name and location, and the extent of participation of other firms., and Bulk dataset download in CSV format, updated daily. The file includes all Form AP data fields documented in the dictionary, with timestamps in Eastern Time..

OpenCorporates logo

OpenCorporates

opencorporates.com

The world’s largest open database of legal entities, offering both a public-facing search and an API. Free access is available for personal or public-benefit use, while commercial API access and bulk datasets require a paid plan. Bulk deliveries are provided via SFTP in CSV format, and the platform includes a public status page for web, API, knowledge base, and SFTP availability.

Platforms

Web
API

Pricing

Free
Subscription

Quick highlights

  • 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links.
  • Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day).
  • OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers.
  • Enterprise bulk access via SFTP, with six structured CSV datasets (Companies, Officers, Non-Registered Addresses, Alternative Names, Additional Identifiers, and Relationships).
  • Relationships dataset includes 30M+ links covering subsidiaries, branches, control statements, and shareholdings, with data from sources like the SEC and UK PSC.

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PCAOB AuditorSearch logo

PCAOB AuditorSearch

pcaobus.org

Free public database built from Form AP filings. Users can search audit engagements by company, firm, or partner, or download the full dataset as a CSV file updated daily. Bulk downloads are timestamped in Eastern Time and do not include the ticker field.

Platforms

Web

Pricing

Free

Quick highlights

  • Searchable by engagement partner, audit firm, or public company, with support for company name, CIK, ticker, and firm identifiers.
  • Displays engagement partner details, audit firm name and location, and the extent of participation of other firms.
  • Bulk dataset download in CSV format, updated daily. The file includes all Form AP data fields documented in the dictionary, with timestamps in Eastern Time.
  • Form AP filings are required for each audit of a public company, forming the core of the database.
  • Advanced search tools and a contact form are available for deeper queries and user support.

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Overlap

Shared focus areas

1 overlap

Both tools cover this research theme.

Where they differ

OpenCorporates

Distinct strengths include:

Data APIs
Other
  • 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links.
  • Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day).
  • OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers.
  • Enterprise bulk access via SFTP, with six structured CSV datasets (Companies, Officers, Non-Registered Addresses, Alternative Names, Additional Identifiers, and Relationships).

Feature-by-feature breakdown

AttributeOpenCorporatesPCAOB AuditorSearch
Categories

Which research workflows each platform targets

Shared: Regulatory Filings Monitoring

Unique: Data APIs, Other

Shared: Regulatory Filings Monitoring

Asset types

Supported asset classes and universes

Other

Other

Experience levels

Who each product is built for

Beginner, Intermediate, Advanced

Beginner, Intermediate, Advanced

Platforms

Where you can access the product

Web, API

Web

Pricing

High-level pricing models

Free, Subscription

Free

Key features

Core capabilities called out by each vendor

Unique

  • 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links.
  • Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day).
  • OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers.
  • Enterprise bulk access via SFTP, with six structured CSV datasets (Companies, Officers, Non-Registered Addresses, Alternative Names, Additional Identifiers, and Relationships).
  • Relationships dataset includes 30M+ links covering subsidiaries, branches, control statements, and shareholdings, with data from sources like the SEC and UK PSC.
  • Data acquisition ranges from hourly to quarterly; registry ingestion checks run every 5 minutes. Bulk deliveries are typically no more than one month behind official registries.

Unique

  • Searchable by engagement partner, audit firm, or public company, with support for company name, CIK, ticker, and firm identifiers.
  • Displays engagement partner details, audit firm name and location, and the extent of participation of other firms.
  • Bulk dataset download in CSV format, updated daily. The file includes all Form AP data fields documented in the dictionary, with timestamps in Eastern Time.
  • Form AP filings are required for each audit of a public company, forming the core of the database.
  • Advanced search tools and a contact form are available for deeper queries and user support.
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Frequently Asked Questions

Which workflows do OpenCorporates and PCAOB AuditorSearch both support?

Both platforms cover Regulatory Filings Monitoring workflows, so you can research those use cases in either tool before digging into the feature differences below.

Do OpenCorporates and PCAOB AuditorSearch require subscriptions?

Both OpenCorporates and PCAOB AuditorSearch keep freemium access with optional paid upgrades, so you can trial each platform before committing.

How can you access OpenCorporates and PCAOB AuditorSearch?

Both OpenCorporates and PCAOB AuditorSearch prioritize web or desktop access. Investors wanting a mobile-first workflow may need to rely on responsive web views.

What unique strengths set the two platforms apart?

OpenCorporates differentiates itself with 230M+ company records spanning 145+ jurisdictions, aggregated from 140+ official registries with full provenance and source links., Versioned REST API with JSON (default) or XML output; API keys required. Free tier provides up to 200 requests per month (50 per day)., and OpenRefine Reconciliation API allows entity-matching from company names to legal identifiers., whereas PCAOB AuditorSearch stands out for Searchable by engagement partner, audit firm, or public company, with support for company name, CIK, ticker, and firm identifiers., Displays engagement partner details, audit firm name and location, and the extent of participation of other firms., and Bulk dataset download in CSV format, updated daily. The file includes all Form AP data fields documented in the dictionary, with timestamps in Eastern Time..

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Stay on top of related tools

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Curation & Accuracy

This directory blends AI‑assisted discovery with human curation. Entries are reviewed, edited, and organized with the goal of expanding coverage and sharpening quality over time. Your feedback helps steer improvements (because no single human can capture everything all at once).

Details change. Pricing, features, and availability may be incomplete or out of date. Treat listings as a starting point and verify on the provider’s site before making decisions. If you spot an error or a gap, send a quick note and I’ll adjust.