Equity Management Platform Migration: How to Move Without Losing Compliance or Data Integrity

Key Takeaways

• Migration goes beyond data: Preserve grant history, approvals, valuations, documents, and compliance records alongside the cap table. Keep a traceable archive for anything that cannot be imported.
• Audit before go-live: Map and reconcile records, then validate them against source evidence before making the new platform the system of record.
• Global compliance adds risk: Poor field mapping can lose or misclassify local scheme details and reporting history.
• Check after migration: Review record links and change history, test available country reports, and investigate local compliance gaps.

Consider a Series C software company in Denver that moves off the equity platform it chose at seed. It has 380 option holders, including 30 in London and 12 in Toronto. The export loads in an afternoon, and the share totals match. Three months later, UK payroll asks which London grants were notified to HMRC as EMI options, and nobody can say, because the old platform kept that fact in a notes field that never moved. Then a Series D investor asks for the board approval behind a 2021 grant, and the document is missing too. The data had moved but the evidence did not.

Equity management platform migration is the move of a company's full equity record, from cap table and grants to plan documents and compliance history, into a new system without losing the facts that tax authorities, auditors and investors rely on. Moving the numbers is the easy part. This guide covers why companies migrate, which data has to travel, a four-step method, where migrations break, a stage-by-stage checklist, and what to verify after go-live.

What Is Equity Management Platform Migration?

Equity management platform migration is the transfer of a company's ownership and equity compensation records from one system of record to another, with each record's history, documents, and obligations carried across intact. In practice, it is closer to a controlled audit than a data transfer.

An equity record is a legal and tax record, not only an operational one. A grant row in a spreadsheet is a number. In a compliant system, the same grant is a board approval, a plan version, an exercise price backed by a valuation, a vesting schedule, a country of employment and reporting events that may already have been filed. A migration that carries the number and drops the rest can still produce a clean-looking cap table, which is why the gaps tend to surface later, in an audit or a financing.

What Forces Companies to Migrate Equity Management Platforms

Companies rarely switch equity platforms for convenience, because a move takes time from finance, legal and HR. These four triggers tend to make staying put more expensive than leaving.

• Outgrowing a Domestic-First Platform as the Company Expands Internationally: A platform built for US grants can record a UK or Canadian grant but may have no field for the local scheme, reporting event, or employing entity. With employees in several countries, those gaps become spreadsheets kept beside the system.
  
• Compliance Gaps That the Old Platform Was Never Built to Handle: Country-specific obligations, such as UK scheme registration and notifications or German rules on when option income arises, do not fit a data model designed around US forms. Finance ends up tracking them separately, which is often where a deadline is missed.
  
• Manual Workarounds That Create Risk as the Cap Table Grows: Each manual reconciliation between the equity platform, payroll and HR is a point where a figure can drift. At 50 holders, a person can catch it. At 500 across several countries, errors stop being visible.
  
• Preparing for a Fundraise, Audit, or Exit That Demands a Cleaner Record: Investors, auditors and acquirers ask for the approval, valuation and documents behind specific grants. If the current system cannot produce them quickly, a migration often starts as part of the cleanup, ideally before the diligence request arrives.

What Data to Migrate During an Equity Management Platform Migration?

Write the migration scope before running any export, because what is left out of scope is usually lost for good. These four categories keep both the cap table and the compliance history usable.

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How to Migrate to a New Equity Management Platform

A migration that holds up runs in a fixed order, with sign-off at the end of each step. Skipping ahead tends to create rework.

1. Audit Existing Equity Data Before Moving Anything: Export everything the old platform holds, including notes, custom fields and attachments, and compare it with board minutes and signed agreements. The goal is a complete list of holders, grants and documents, plus a list of what is missing, before any data is mapped.
   
2. Map Data Fields to the New Platform's Structure: Match each source field to its destination, and record each field that has no equivalent. Watch fields the old system stored as free text, such as scheme type, employing entity, or a country notification date, because an import can drop those without an error message.
   
3. Clean and Reconcile Historical Records: Resolve conflicts between the system, the documents and the ledger before import, not after. Where the signed agreement and the platform disagree on an exercise price or vesting start date, check the plan, board approval and signed agreement to establish the operative terms, and record any approved correction rather than quietly overwriting the data.
   
4. Import, Validate, and Sign Off on Migrated Data: Load the data in batches, reconcile totals after each one, and check a sample of grants line by line against source documents. Close with a written sign-off from finance and legal, so the new platform becomes the system of record on a known date.

Where Equity Platform Migrations Break Down

Many migration failures are not technical. They come from records that were already incomplete, which the move exposes rather than creates.

• Inconsistent or Incomplete Historical Grant Data: Older grants are often the least complete, with missing grant dates, rounded exercise prices, or vesting starts that differ from the agreement. They are also the records likely to sit behind an exercise, a tax return or a diligence question.
  
• Structural Differences Between Platform Data Models: One platform may treat a country sub-plan as its own plan while another treats it as a tag on the main plan, and the same can apply to early exercise, repricing or partial cancellation. A one-to-one field match can hide a difference in meaning that shows up only in a report.
  
• Missing Grant Documents and Supporting Evidence: A record can migrate perfectly and still lack the approval, the agreement, or the valuation behind it. Without it, the record is harder to defend in an audit and slower to confirm in a financing.
  
• Cap Table and Grant Records That Do Not Reconcile: Issued shares, outstanding options, and the remaining pool should tie back to the authorized totals. When they do not, the gap usually traces to an exercise, transfer, or cancellation recorded in one place only, and it is far cheaper to find before go-live.

Equity Management Platform Migration Checklist

The checklist below splits the work into three stages, with the reason each item matters. It adds the controls that protect compliance history to the four-step method above.

Before Migration

The before stage decides how clean the migration can be. Its value comes from finding gaps while the old platform can still answer questions.

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During Migration

The during stage is where data changes hands. Its controls catch errors batch by batch rather than at the end.

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After Migration

The after stage confirms that the new platform carries the obligations, not just the data, and retires the old one with its record still retrievable.

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What Changes After Migration: Compliance, Audit Trails, and Reporting

Go-live is when the migrated record starts carrying real obligations. These three areas are where a migration tends to be tested in its first year.

Verifying Country-Specific Compliance Obligations Are Still Met After Import

Each jurisdiction's obligations should be checked against the migrated data, not assumed to have transferred with it. In the UK, for example, a new CSOP scheme must be notified to HMRC by 6 July following the tax year in which its first options were granted; EMI options granted on or after 6 April 2024 must be notified by 6 July following the tax year of grant, and missing the applicable deadline can put tax-advantaged treatment at risk.

If the scheme reference and notification dates did not migrate, the next return can be built on incomplete data. Germany, Canada, Australia and France raise similar questions, with different obligations that depend as much on grant-level history.

Confirming Audit Trail Continuity for Historical Grants and Exercises

An audit trail is useful only if it shows when things actually happened. After import, grants, exercises, transfers and cancellations should carry their original dates and approvals, and the migration itself should appear as a separate, dated event. The company can then show an auditor both the history and the point the record moved, rather than a cap table that appears to begin on import day.

Ensuring Country-Specific Reports Reflect Migrated Data Correctly

The first reporting cycle after go-live is a dependable test of the migration. Run each country's due reports from the new platform, compare them with the last ones from the old platform, and investigate any difference before filing. A US Form 3921 or UK annual return that shifts year over year for no business reason usually points to a field that did not migrate as intended.

Migrate Your Equity Data to Slice Without Sacrificing Accuracy or Compliance

Slice is the AI-native global equity management and compliance platform. It treats a migration as the start of an ongoing compliance record rather than a one-time data load, with onboarding run by its own specialists.

• Migrates Equity Records From Carta, Pulley, and Other Platforms: Slice runs specialist-led migrations from platforms from platforms including Carta and Pulley (which shut down in 2026), each led by an onboarding specialist with a legal background. The customer's team provides the documents, and Slice handles configuration, compliance setup and validation.
  
• Imports and Validates Historical Grant and Cap Table Data: Slice conducts a full data audit and due diligence on the existing cap table, grants and documents, and verifies data integrity and document completeness before anything goes live. Its AI-native Documents Sync extracts key data from grant documents, board approvals and share certificates and matches each document to the right stakeholder.
  
• Reconciles Historical Equity Records Against Local Compliance Rules: During onboarding, historical grants, exercises and documents are imported, verified and cross-checked against current regulations. Aqua Security describes an onboarding that flagged and fixed long-standing issues its team had not known existed.
  
• Sets Up Compliance Monitoring for Imported Grants Across the Countries It Covers: Compliance monitoring is set up during onboarding, and after go-live, real-time, country-specific alerts flag exposure early so it can be addressed before it becomes a problem.
  
• Carries Grant History and Compliance Records Through the Migration: The data, cap table, grant history and compliance records transfer with the migration. After go-live, its audit trail records user actions and data changes on the platform.
  
• Syncs Stakeholder Data From HR Systems Post-Migration: Slice's HRIS sync keeps stakeholder data updated from HR systems such as HiBob, BambooHR and Workday, with custom field mapping, so status changes reach the equity record without manual re-keying.

Conclusion

An equity management platform migration succeeds or fails on what travels with the numbers. Share totals are easy to reconcile. Grant dates, approvals, scheme notifications, employing entities and residence history keep a migrated record defensible, and they are often stored where an export does not reach. Audit before mapping, reconcile before importing, validate in batches and test the first reporting cycle, and the move can leave a cleaner record than it found.

Slice is built for that kind of move. As the AI-native global equity management and compliance platform, it combines specialist-led onboarding with country-specific compliance monitoring across the countries it covers, so a migration becomes the point where gaps are found and closed rather than carried forward.