# BlackRock California Municipal Opportunities Fund

BlackRock California Municipal Opportunities Fund is a registered fund series of BlackRock California Municipal Series Trust (series S000004030). Net assets $2.4B as of 2026-05-31.

## Profile

- Series ID: S000004030
- Registrant: BlackRock California Municipal Series Trust
- LEI: LQOJZ5EXQ6332KB2NH96
- Net assets: $2.4B
- Total assets: $2.5B
- As of: 2026-05-31

## Advisers

- [BlackRock Advisors, LLC (Advisor)](https://search.stillhousedata.com/firm/106614)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [United States Treasury](https://search.stillhousedata.com/security/912797UA3) | — | $114.8M | 469.66% |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JHG4) | — | $64.8M | 265.23% |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JDB9) | — | $53.8M | 220.20% |
| [California Housing Finance Agency](https://search.stillhousedata.com/security/13034DBS2) | — | $50.0M | 204.47% |
| [iShares California Muni Bond ETF](https://search.stillhousedata.com/security/464288356) | — | $49.3M | 201.73% |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JGF7) | — | $48.4M | 197.82% |
| [California State Public Works Board](https://search.stillhousedata.com/security/13068XLF4) | — | $44.5M | 181.87% |
| [County of Sacramento CA Airport System Revenue](https://search.stillhousedata.com/security/786107VA7) | — | $38.0M | 155.51% |
| [California State University](https://search.stillhousedata.com/security/13077DWF5) | — | $34.8M | 142.33% |
| [City of San Francisco CA Public Utilities Commission Water Revenue](https://search.stillhousedata.com/security/79771FLJ4) | — | $32.7M | 133.58% |
| [Regents of the University of California Medical Center Pooled Revenue](https://search.stillhousedata.com/security/913366KS8) | — | $29.6M | 121.16% |
| [California Community Choice Financing Authority](https://search.stillhousedata.com/security/13013JFR2) | — | $29.3M | 119.87% |
| [City of Los Angeles Department of Airports](https://search.stillhousedata.com/security/5444456H7) | — | $28.2M | 115.34% |
| [California Infrastructure & Economic Development Bank](https://search.stillhousedata.com/security/13034A7E4) | — | $28.0M | 114.57% |
| [San Francisco City & County Public Utilities Commission Wastewater Revenue](https://search.stillhousedata.com/security/79768HGH5) | — | $27.8M | 113.51% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-05-31 | $2.4B |
| 2026-02-28 | $2.5B |
| 2025-11-30 | $2.4B |
| 2025-08-31 | $2.3B |
| 2025-05-31 | $2.3B |
| 2025-02-28 | $2.4B |
| 2024-11-30 | $2.4B |
| 2024-08-31 | $2.4B |

## More

- [Registrant: BlackRock California Municipal Series Trust](https://search.stillhousedata.com/registrant/765199)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000004030.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.