48-HOUR RULE
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In TBA mortgage-backed securities trading, the requirement that sellers disclose pool details to buyers at least 48 hours before settlement.
Summary
The 48-Hour Rule is a regulatory requirement in the mortgage-backed securities (MBS) market that ensures transparency in TBA (To-Be-Announced) trading. When a seller agrees to deliver MBS to a buyer, they must provide specific details about the actual mortgage pools (such as loan characteristics, geographic distribution, and other pool information) at least 48 hours before the settlement date. This rule protects buyers by giving them time to evaluate the actual securities they will receive and decide whether to accept delivery or seek alternatives.
Usage Context
This term is crucial when studying fixed-income securities trading, particularly in modules covering mortgage-backed securities, trading mechanics, settlement procedures, and regulatory compliance in secondary mortgage markets.
Common Confusions
- Thinking the rule applies to all mortgage securities, not just TBA trades
- Confusing this with the 3-day settlement rule for regular securities
- Believing buyers can always reject delivery after seeing pool details
- Assuming the 48 hours starts from trade date rather than before settlement
- Thinking this rule guarantees specific pool characteristics rather than just disclosure
