# BlackRock California Municipal Series Trust

BlackRock California Municipal Series Trust (CIK 765199) is an SEC-registered fund company with 1 reporting fund series and $2.4B in net assets as of 2026-05-31.

## Registrant

- CIK: 765199
- File number: 811-04264
- LEI: 5493003C56LLBKW8JY53
- Address: 100 Bellevue Parkway, Wilmington, US-DE, 19809
- Phone: 800-441-7762
- Net assets: $2.4B
- Total assets: $2.5B
- Fund series: 1
- Latest report: 2026-05-31

## Fund series (1)

| Series | Net assets |
| --- | --- |
| [BlackRock California Municipal Opportunities Fund](https://search.stillhousedata.com/fund/S000004030) | $2.4B |

## Largest reported holdings (across all series)

| Holding | Value |
| --- | --- |
| [United States Treasury](https://search.stillhousedata.com/security/912797UA3) | $114.8M |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JHG4) | $64.8M |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JDB9) | $53.8M |
| [California Housing Finance Agency](https://search.stillhousedata.com/security/13034DBS2) | $50.0M |
| [iShares California Muni Bond ETF](https://search.stillhousedata.com/security/464288356) | $49.3M |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JGF7) | $48.4M |
| [California State Public Works Board](https://search.stillhousedata.com/security/13068XLF4) | $44.5M |
| [County of Sacramento CA Airport System Revenue](https://search.stillhousedata.com/security/786107VA7) | $38.0M |
| [California State University](https://search.stillhousedata.com/security/13077DWF5) | $34.8M |
| [City of San Francisco CA Public Utilities Commission Water Revenue](https://search.stillhousedata.com/security/79771FLJ4) | $32.7M |
| [Regents of the University of California Medical Center Pooled Revenue](https://search.stillhousedata.com/security/913366KS8) | $29.6M |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JFR2) | $29.3M |
| [City of Los Angeles Department of Airports](https://search.stillhousedata.com/security/5444456H7) | $28.2M |
| [California Infrastructure & Economic Development Bank](https://search.stillhousedata.com/security/13034A7E4) | $28.0M |
| [San Francisco City & County Public Utilities Commission Wastewater Revenue](https://search.stillhousedata.com/security/79768HGH5) | $27.8M |

## More

- [CIK 765199 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=765199&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/registrant/765199.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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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.