VOL. XCIV, NO. 247

★ FINANCIAL TOOLS & SERVICES DIRECTORY ★

PRICE: 5 CENTS

Sunday, October 5, 2025

View Find and update company information (Companies House)View Unusual WhalesBack to Home

Head-to-head

Find and update company information (Companies House) vs Unusual Whales comparison

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

Quick takeaways

Find and update company information (Companies House) adds Regulatory Filings Monitoring coverage that Unusual Whales skips.

Unusual Whales includes Screeners, Options & Derivatives, Portfolio, Paper Trading, Dark Pool & Off-Exchange, News, US Government Trades, Insider Data, 13F, APIs & SDKs, Education, Calendar, and Dividends categories that Find and update company information (Companies House) omits.

Find and update company information (Companies House) highlights: Free search and viewing of company information including registered details, officers, filing history, document images, mortgage charges, and insolvency data., Follow companies and receive email alerts when new filings are accepted, with direct links to the filing history., and Order certified copies and certificates (fees apply, e.g. £15 standard / £50 express)..

Unusual Whales is known for: Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy., Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones., and Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals..

Unusual Whales offers mobile access, which Find and update company information (Companies House) skips.

Find and update company information (Companies House) logo

Find and update company information (Companies House)

find-and-update.company-information.service.gov.uk

The official UK companies register, providing free search and access to filing histories, document images, and company information. Users can follow companies for email alerts on new filings, and bulk data is available via monthly downloads. Certified copies and certificates are offered for a fee. Developers have access to REST and Streaming APIs with clear rate limits, making the service a reliable, real-time regulatory source.

Platforms

Web
API

Pricing

Free

Quick highlights

  • Free search and viewing of company information including registered details, officers, filing history, document images, mortgage charges, and insolvency data.
  • Follow companies and receive email alerts when new filings are accepted, with direct links to the filing history.
  • Order certified copies and certificates (fees apply, e.g. £15 standard / £50 express).
  • Bulk data available as monthly CSV snapshots of the entire UK companies register.
  • Public REST API providing structured access to company data (companies, officers, persons of significant control, etc.), authenticated via API key; some flows support OAuth2. Rate limit of 600 requests per 5 minutes.

Community votes (overall)

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Unusual Whales logo

Unusual Whales

unusualwhales.com

Editor’s pick Hands-on review

Real-time options flow and dark-pool analytics built for active traders. Free plans view delayed data; paid tiers stream live flow, with annual plans unlocking data downloads. The public API is sold separately, and “Periscope” (market-wide SPX exposure) is available as an add-on.

Platforms

Web
Mobile
API

Pricing

Free
Subscription

Quick highlights

  • Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy.
  • Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones.
  • Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals.
  • Options Profit Calculator to model multi-leg strategies, Greeks, and payoff P/L.
  • Paper trading for both stocks and options to test ideas without risk.

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Overlap

Shared focus areas

2 overlaps

Mutual strengths include Alerts, and Data APIs.

Where they differ

Find and update company information (Companies House)

Distinct strengths include:

Regulatory Filings Monitoring
  • Free search and viewing of company information including registered details, officers, filing history, document images, mortgage charges, and insolvency data.
  • Follow companies and receive email alerts when new filings are accepted, with direct links to the filing history.
  • Order certified copies and certificates (fees apply, e.g. £15 standard / £50 express).
  • Bulk data available as monthly CSV snapshots of the entire UK companies register.

Unusual Whales

Distinct strengths include:

Screeners
Options & Derivatives
Portfolio
Paper Trading
Dark Pool & Off-Exchange
News
US Government Trades
Insider Data
  • Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy.
  • Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones.
  • Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals.
  • Options Profit Calculator to model multi-leg strategies, Greeks, and payoff P/L.

Feature-by-feature breakdown

AttributeFind and update company information (Companies House)Unusual Whales
Categories

Which research workflows each platform targets

Shared: Alerts, Data APIs

Unique: Regulatory Filings Monitoring

Shared: Alerts, Data APIs

Unique: Screeners, Options & Derivatives, Portfolio, Paper Trading, Dark Pool & Off-Exchange, News, US Government Trades, Insider Data, 13F, APIs & SDKs, Education, Calendar, Dividends

Asset types

Supported asset classes and universes

Other

Stocks, ETFs, Options

Experience levels

Who each product is built for

Beginner, Intermediate, Advanced

Beginner, Intermediate, Advanced

Platforms

Where you can access the product

Web, API

Web, Mobile, API

Pricing

High-level pricing models

Free

Free, Subscription

Key features

Core capabilities called out by each vendor

Unique

  • Free search and viewing of company information including registered details, officers, filing history, document images, mortgage charges, and insolvency data.
  • Follow companies and receive email alerts when new filings are accepted, with direct links to the filing history.
  • Order certified copies and certificates (fees apply, e.g. £15 standard / £50 express).
  • Bulk data available as monthly CSV snapshots of the entire UK companies register.
  • Public REST API providing structured access to company data (companies, officers, persons of significant control, etc.), authenticated via API key; some flows support OAuth2. Rate limit of 600 requests per 5 minutes.
  • Streaming API for real-time updates covering company information, filing history, insolvency, and charges.

Unique

  • Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy.
  • Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones.
  • Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals.
  • Options Profit Calculator to model multi-leg strategies, Greeks, and payoff P/L.
  • Paper trading for both stocks and options to test ideas without risk.
  • Portfolio Manager with broker linking for IBKR, tastytrade, Fidelity, and Robinhood.
Tested

Verified by hands-on testing inside Find My Moat

Not yet

Yes

Editor pick

Featured inside curated shortlists

Standard listing

Highlighted

Frequently Asked Questions

Which workflows do Find and update company information (Companies House) and Unusual Whales both support?

Both platforms cover Alerts, and Data APIs workflows, so you can research those use cases in either tool before digging into the feature differences below.

Do Find and update company information (Companies House) and Unusual Whales require subscriptions?

Both Find and update company information (Companies House) and Unusual Whales keep freemium access with optional paid upgrades, so you can trial each platform before committing.

Which tool has mobile access?

Unusual Whales ships a dedicated mobile experience, while Find and update company information (Companies House) focuses on web or desktop access.

What unique strengths set the two platforms apart?

Find and update company information (Companies House) differentiates itself with Free search and viewing of company information including registered details, officers, filing history, document images, mortgage charges, and insolvency data., Follow companies and receive email alerts when new filings are accepted, with direct links to the filing history., and Order certified copies and certificates (fees apply, e.g. £15 standard / £50 express)., whereas Unusual Whales stands out for Live options flow across all US options exchanges, with a status indicator so you know the feed is healthy., Dark-pool tape plus ‘Dark Pool Levels’ to surface recent prints and ticker-specific liquidity zones., and Options and stock screeners with filters for premium, volume, open interest, IV rank, and common technicals..

Keep exploring

Stay on top of related tools

Browse the categories and profiles that overlap most with this comparison to round out your shortlist.

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.