# Credit Suisse First Boston Mortgage Securities CSFB Mortgage-Backed Pass-Through Certificates

Credit Suisse First Boston Mortgage Securities CSFB Mortgage-Backed Pass-Through Certificates is a security (CUSIP 2254585R5) tracked across SEC portfolio filings. 1 registered fund positions totaling $189K via N-PORT as of 2026-03-31.

## Summary

- Issuer: Credit Suisse First Boston Mortgage Securities
- Class: CSFB Mortgage-Backed Pass-Through Certificates
- CUSIP: 2254585R5
- Asset category: ABS-MBS
- 13F holders: 0
- N-PORT fund positions: 1
- N-PORT value: $189K
- N-PORT report: 2026-03-31

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| RiverNorth/DoubleLine Strategic Opportunity Fund Inc. | RIVERNORTH/DOUBLELINE STRATEGIC OPPORTUNITY FUND INC. | $189K | 8.90% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/2254585R5.md)
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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.