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SPECIFICTION
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CoreFiling Seahorse

corefiling.com

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Spec score 7.5 #4 of 17 in Disclosure Management Software

What it is

CoreFiling Seahorse is browser-based SaaS for creating and converting XBRL, iXBRL, and XML regulatory filings. It converts annual reports from PDF, Word, Excel, or InDesign into XHTML while preserving visual design; EPUB import is available for InDesign users. Completed financial reports can be prepared as Inline XBRL, including ESEF and UKSEF reports and UK HMRC tax returns. Machine-learning suggestions identify tags for report lines and give confidence scores for review. Seahorse can tag financial tables in one pass, handle block and nested-block tagging for notes, and check filings against ESMA conformance rules and the ESEF filing manual, showing errors and warnings during work. A roll-over feature carries prior-year tagging decisions into later reports. Other uses include Country-by-Country Reporting templates and conversion, plus selected reporting from CSV and specially formatted Excel inputs. CoreFiling says licences, onboarding, and support come through certified providers in Europe and the UK. The cloud service runs in a browser without installation and exposes tagging and validation through APIs.

Spec sheet

Purpose
Seahorse is SaaS software for creating and converting XBRL, iXBRL, and XML regulatory filings.Read 4 Oct 2026 · corefiling.com
Intended users
CoreFiling describes Seahorse as serving in-house teams and tagging partners preparing ESEF reports.Read 4 Oct 2026 · corefiling.com
Security
CoreFiling states that it holds ISO 27001 certification for information security.Read 4 Oct 2026 · corefiling.com
Headquarters
Oxford, United KingdomRead 28 Sep 2026 · corefiling.com
Founded
1997Read 28 Sep 2026 · corefiling.com
Automated tagging
Its automated tag-selection engine uses machine learning informed by selections from thousands of previous filings.Read 4 Oct 2026 · corefiling.com
Browser access
Seahorse runs as SaaS in the browser and requires no installation, according to CoreFiling’s ESEF software page.Read 4 Oct 2026 · corefiling.com
Certification
Seahorse holds XBRL International’s Report Creation Software certification.Read 4 Oct 2026 · corefiling.com
Country-by-country reporting
It provides Excel templates for CbCR and converts and validates the resulting reports against applicable business rules.Read 4 Oct 2026 · corefiling.com
Data inputs
For some prudential, regulatory, and statistical reporting, it accepts CSV and specially formatted Excel sheets that can be combined with templates.Read 4 Oct 2026 · corefiling.com
ESG reporting
CoreFiling says it works with standards setters and regulators to keep Seahorse ready for ESG reporting requirements.Read 4 Oct 2026 · corefiling.com
Financial reports
It converts completed annual financial reports and accounts into Inline XBRL, including ESEF and UKSEF reports and UK HMRC tax returns.Read 4 Oct 2026 · corefiling.com
Input formats
It accepts PDF, Word, Excel and InDesign documents, with EPUB import available for InDesign users.Read 4 Oct 2026 · corefiling.com
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.Read 4 Oct 2026 · corefiling.com
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.Read 4 Oct 2026 · corefiling.com
Other reporting
For Country-by-Country Reporting, it provides Excel templates and converts and validates the resulting reports.Read 4 Oct 2026 · corefiling.com
Prior-year rollover
Its roll-over feature copies a company’s prior-year tagging decisions to reduce work in later reporting years.Read 4 Oct 2026 · corefiling.com
Report conversion
It converts annual reports from PDF, Word, Excel, or InDesign into XHTML while preserving their visual design.Read 4 Oct 2026 · corefiling.com
Roll-over
The roll-over feature carries prior-year tagging decisions into subsequent reports.Read 4 Oct 2026 · corefiling.com
Support and access
CoreFiling says customers obtain Seahorse licences, onboarding, and support through certified providers in Europe and the UK.Read 4 Oct 2026 · corefiling.com
Supported mandates
The product page names CRD IV, Solvency II, National Specific Templates, ESEF, UKSEF and CbCR among its reporting use cases.Read 4 Oct 2026 · corefiling.com
Table and notes tagging
It can tag financial tables in one pass and supports block and nested block tagging for notes.Read 4 Oct 2026 · corefiling.com
Validation
Outputs are validated against relevant technical standards and filing rules for each reporting programme.Read 4 Oct 2026 · corefiling.com

Strong points and limits

Strong points

  • Converts reports from PDF, Word, Excel, and InDesign.
  • Tag suggestions include confidence scores for review.
  • Checks filings against ESMA and ESEF requirements.
  • Roll-over carries prior-year tagging decisions forward.
  • Runs in a browser without installation.

Limits

  • Pricing is available on request.
  • Tagging requires accounting knowledge for review.
  • The first year can take the most work.
  • Regulator submission is not supported.

Who it suits

Seahorse is intended for in-house teams and tagging partners preparing ESEF reports, as well as organizations producing other supported regulatory filings. It suits users who can review machine-generated tagging suggestions; CoreFiling says tagging requires accounting knowledge.

Verdict

Seahorse brings report conversion, tagging, and validation into a browser-based workflow, with support for several filing types. Teams should account for the review knowledge required and the work involved in the first year.

Where Specifiction places it

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