The source and target speak differently
A field that looks equivalent may carry different rules, classifications, or history in the two systems.
Data Services
Portfolio data migration services for firms that cannot afford lost history
A portfolio system migration is not finished when the data loads. CSSI helps investment firms map the source, convert the data, validate history and cost basis, compare reporting output, and prepare the operating team for the target system.
- Support for system migrations, acquired-book merges, and data conversions
- Historical transactions, performance, classifications, and cost basis included in the planning conversation
- Validation against real reporting and operating requirements
- Useful for firms moving systems without losing confidence in the output
Why migrations go wrong
The hard part is the meaning inside the data
History is treated as an export problem
Old transactions, performance, tax lots, and account relationships often matter long after the go-live date.
Validation stops at the load
A successful import does not prove that reports, reconciliations, workflows, and client output behave correctly.
Scope
Migration work has to include the operating consequences
Account, position, and transaction mapping
Define how the core portfolio records move and what must be transformed.Historical data and performance
Identify what history is required for reporting continuity and how it will be checked.Cost basis and special assets
Plan for cost basis, private equity, complex transactions, and records that do not fit a clean template.Reports, reconciliations, and user workflows
Validate the outputs and processes the team actually uses after the migration.
Migration sequence
Move in a way the firm can prove
- 01
Inventory the source and target
Document systems, feeds, accounts, history, reports, integrations, and the business owners of each output. - 02
Map and transform the data
Make the conversion rules explicit before the team is looking at a target system full of unexplained exceptions. - 03
Run parallel validation
Compare positions, transactions, performance, reports, and operational checks against known source results. - 04
Plan go-live and stabilization
Define the cutover, open issues, user support, reconciliation cadence, and next cleanup wave.
Related paths
A migration usually changes more than the database
Axys to APX
For a specific platform move, see Axys to APX migration support.
Data integration
For ongoing system connections, review investment data services and integrations.
Reporting after the move
For report output and package work, see portfolio reporting services.
Questions
Frequently asked questions
Straight answers to the implementation, workflow, and fit questions that usually come up first.
What does portfolio data migration include?
It can include source and target mapping, account and transaction conversion, historical data, performance, cost basis, validation, reports, reconciliations, and go-live support.
Can CSSI migrate historical performance?
Historical performance requirements should be defined early. CSSI can help map, convert, and validate the history the firm needs for reporting continuity.
How do you know the migration worked?
Validation should compare real source and target outputs across positions, transactions, performance, reports, and operating workflows rather than stopping at a successful data load.
Can this support an Axys to APX move?
Yes. CSSI also provides platform-specific Axys to APX migration support for firms that need a focused conversion path.
Next step
Move the data without losing the firm’s memory
Tell CSSI what system the data is leaving, where it needs to go, which history matters, and what has already gone wrong. That is enough to start scoping the real migration work.
