Definitions
In plain terms
A backtest must ask which securities belonged to the universe on each historical date, rather than using only today's members.
Technical
A membership record requires stable security identity, universe identity, inclusion and exclusion boundaries, decision or knowledge timestamps, source, and revision lineage.
Scope
Membership does not by itself state a portfolio weight or guarantee investability.
Examples
- A governed dataset records universe membership explicitly instead of inferring it from an ambiguous field.
Common misconceptions
- Universe Membership does not have one universal meaning without its stated market, source, and time context.
Concept relationships
Where this concept is used
- ImportantMerger Predecessor/Successor Mapping: Preserve Identity and Entitlements Without Inventing ContinuityD02-F03-A04
- ImportantDelisting Return Reconstruction: Separate Observed Proceeds from EstimatesD02-F03-A05
- PrimaryHistorical Constituent Reconstruction: Rebuild the Roster Without Looking AheadD02-F04-A01
- ImportantSurvivorship-Bias Guard: Keep Historical Failures in the TestD02-F04-A02
- ImportantIPO Availability Timestamping: Separate Listing Events from Research KnowledgeD02-F04-A03
- ImportantEligibility ScreenD03-F06-A01
- ImportantIPO Fast-Entry RuleD03-F06-A04
- PrerequisiteReconstitution AlgorithmD03-F06-A05
Evidence and governance
- Fintech Builder Glossary Definition Contract The Fintech Builder · internal governed contract
Supports: preferred label, short definition, technical definition
Limits: Defines governed platform behavior rather than claiming these policies are universally prescribed by external McClellan methodology.
- Reviewed by
- fintech-builder-owner-approved
- Last reviewed
- 2026-07-26
- Next review
- 2027-07-26
- Record status
- published