CoreFiling Seahorse
CoreFiling Seahorse is browser-based SaaS for creating and converting XBRL, iXBRL, and XML regulatory filings.
What CoreFiling Seahorse is
CoreFiling Seahorse is browser-based SaaS for creating and converting XBRL, iXBRL, and XML regulatory filings. It turns reports from PDF, Word, Excel, or InDesign into XHTML while retaining their visual design; EPUB import is available for InDesign users. Completed annual financial reports can be converted to Inline XBRL, including ESEF and UKSEF reports and UK HMRC tax returns. Machine-learning suggestions identify tags for report lines and provide confidence scores for review. Seahorse can tag financial tables in one pass and supports block and nested-block tagging for notes. It checks filings against ESMA conformance rules and the ESEF filing manual, flagging errors and warnings during work. Roll-over carries tagging choices into the next reporting year. For Country-by-Country Reporting, it supplies Excel templates and converts and validates reports against business rules. Some prudential, regulatory, and statistical submissions can use CSV or specially formatted Excel inputs. Named use cases include CRD IV, Solvency II, National Specific Templates, ESEF, UKSEF, and CbCR. Pricing is on request; licences, onboarding, and support come through certified providers in Europe and the UK.
Good
- Converts several document formats while retaining report design.
- Suggests tags with confidence scores for review.
- Checks filings against ESMA and ESEF requirements.
- Carries prior-year tagging decisions into later reports.
- Browser-based cloud access requires no installation.
Watch out
- Pricing is available on request.
- Tagging requires accounting knowledge for review.
- The first year can take the most work.
Who it suits
Seahorse suits in-house teams and tagging partners preparing regulatory reports, especially those working with XBRL or ESEF requirements. Reviewers need accounting knowledge to assess tagging, and the first year may involve more work, particularly when creating taxonomy extensions.
Verdict
Seahorse combines report conversion, tagging, validation, and prior-year roll-over for regulatory filing workflows. Teams should account for review work and request pricing through a certified provider.
The facts
Each one read from CoreFiling Seahorse's own pages, with the date it was checked.
What it does
- Automated tagging
- Its machine-learning engine suggests tags for report lines and provides confidence scores for review.checked 4 Oct 2026
- Certification
- Seahorse holds XBRL International’s Report Creation Software certification.checked 4 Oct 2026
- Country-by-country reporting
- It provides Excel templates for CbCR and converts and validates the resulting reports against applicable business rules.checked 4 Oct 2026
- Data inputs
- For some prudential, regulatory, and statistical reporting, it accepts CSV and specially formatted Excel sheets that can be combined with templates.checked 4 Oct 2026
- ESG reporting
- CoreFiling says it works with standards setters and regulators to keep Seahorse ready for ESG reporting requirements.checked 4 Oct 2026
- Financial reports
- It converts completed annual financial reports and accounts into Inline XBRL, including ESEF and UKSEF reports and UK HMRC tax returns.checked 4 Oct 2026
- Input formats
- It accepts PDF, Word, Excel and InDesign documents, with EPUB import available for InDesign users.checked 4 Oct 2026
- Integration
- CoreFiling describes document integration in which a vendor sends Word, Excel, PDF, or InDesign files for Seahorse conversion, tagging, and validation; the broader True North platform exposes tagging and validation through APIs.checked 4 Oct 2026
- Intended users
- CoreFiling describes Seahorse as serving in-house teams and tagging partners preparing ESEF reports.checked 4 Oct 2026
- Notable consideration
- CoreFiling says tagging requires accounting knowledge for review and that the first year can take the most work, especially when creating taxonomy extensions.checked 4 Oct 2026
- Other reporting
- For Country-by-Country Reporting, it provides Excel templates and converts and validates the resulting reports.checked 4 Oct 2026
- Prior-year rollover
- Its roll-over feature copies a company’s prior-year tagging decisions to reduce work in later reporting years.checked 4 Oct 2026
- Purpose
- Seahorse is SaaS software for creating and converting XBRL, iXBRL, and XML regulatory filings.checked 4 Oct 2026
- Report conversion
- It converts annual reports from PDF, Word, Excel, or InDesign into XHTML while preserving their visual design.checked 4 Oct 2026
- Roll-over
- The roll-over feature carries prior-year tagging decisions into subsequent reports.checked 4 Oct 2026
- Security
- CoreFiling states that it holds ISO 27001 certification for information security.checked 4 Oct 2026
- Support and access
- CoreFiling says customers obtain Seahorse licences, onboarding, and support through certified providers in Europe and the UK.checked 4 Oct 2026
- Supported mandates
- The product page names CRD IV, Solvency II, National Specific Templates, ESEF, UKSEF and CbCR among its reporting use cases.checked 4 Oct 2026
- Table and notes tagging
- It can tag financial tables in one pass and supports block and nested block tagging for notes.checked 4 Oct 2026
- Validation
- It checks filings against ESMA conformance rules and the ESEF filing manual, showing errors and warnings as users work.checked 4 Oct 2026
Where it runs
- Browser access
- Seahorse runs as SaaS in the browser and requires no installation, according to CoreFiling’s ESEF software page.checked 4 Oct 2026
The company
- Founded
- 1997checked 28 Sep 2026
- Headquarters
- Oxford, United Kingdomchecked 28 Sep 2026
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