No. 4 of 25 ·Regulatory Reporting Software

CoreFiling Seahorse

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One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

CoreFiling Seahorse is ranked #4 of 25 in regulatory reporting software on Freedom251. It runs on Web.

Compared on regulatory reporting software

XBRL support: Yes
Regulator submission: No
Validation rules: Yes
Audit trail: Yes
Deployment: cloud
API access: Yes

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The record

Purpose: Seahorse is SaaS software for creating and converting XBRL, iXBRL, and XML regulatory filings.
Report conversion: It converts annual reports from PDF, Word, Excel, or InDesign into XHTML while preserving their visual design.
Automated tagging: Its machine-learning engine suggests tags for report lines and provides confidence scores for review.
Table and notes tagging: It can tag financial tables in one pass and supports block and nested block tagging for notes.
Validation: It checks filings against ESMA conformance rules and the ESEF filing manual, showing errors and warnings as users work.
Roll-over: The roll-over feature carries prior-year tagging decisions into subsequent reports.
Other reporting: For Country-by-Country Reporting, it provides Excel templates and converts and validates the resulting reports.
Data inputs: For some prudential, regulatory, and statistical reporting, it accepts CSV and specially formatted Excel sheets that can be combined with templates.
Security: CoreFiling states that it holds ISO 27001 certification for information security.
Support and access: CoreFiling says customers obtain Seahorse licences, onboarding, and support through certified providers in Europe and the UK.
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.
Financial reports: It converts completed annual financial reports and accounts into Inline XBRL, including ESEF and UKSEF reports and UK HMRC tax returns.
Input formats: It accepts PDF, Word, Excel and InDesign documents, with EPUB import available for InDesign users.
Prior-year rollover: Its roll-over feature copies a company’s prior-year tagging decisions to reduce work in later reporting years.

Where it ranks on Freedom251

Best Regulatory Reporting Software in 2026#4 of 25

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Sources

corefiling.com/seahorse-saas/· checked 4 Oct 2026
corefiling.com/esef-reporting-software/· checked 4 Oct 2026