# Credit Suisse First Boston Mortgage Securities CSFB Mortgage-Backed Pass-Through Certificates Series 2004-AR4

Credit Suisse First Boston Mortgage Securities CSFB Mortgage-Backed Pass-Through Certificates Series 2004-AR4 is a security (CUSIP 22541SFA1) tracked across SEC portfolio filings. 1 registered fund positions totaling $169K via N-PORT as of 2025-07-31.

## Summary

- Issuer: Credit Suisse First Boston Mortgage Securities
- Class: CSFB Mortgage-Backed Pass-Through Certificates Series 2004-AR4
- CUSIP: 22541SFA1
- Asset category: ABS-MBS
- 13F holders: 0
- N-PORT fund positions: 1
- N-PORT value: $169K
- N-PORT report: 2025-07-31

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [Morgan Stanley Mortgage Securities Trust](https://search.stillhousedata.com/fund/S000002467) | MORGAN STANLEY MORTGAGE SECURITIES TRUST | $169K | 2.83% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/22541SFA1.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

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.