# BlackRock Municipal Series Trust

BlackRock Municipal Series Trust (CIK 799113) is an SEC-registered fund company with 1 reporting fund series and $3.4B in net assets as of 2026-05-31.

## Registrant

- CIK: 799113
- File number: 811-04802
- LEI: 549300THM7OMQ75Z2202
- Address: 100 Bellevue Parkway, Wilmington, US-DE, 19809
- Phone: 800-441-7762
- Net assets: $3.4B
- Total assets: $3.7B
- Fund series: 1
- Latest report: 2026-05-31

## Fund series (1)

| Series | Net assets |
| --- | --- |
| [BlackRock Strategic Municipal Opportunities Fund](https://search.stillhousedata.com/fund/S000004053) | $3.4B |

## Largest reported holdings (across all series)

| Holding | Value |
| --- | --- |
| [United States Treasury](https://search.stillhousedata.com/security/912797UA3) | $249.6M |
| [BlackRock Liquidity Funds](https://search.stillhousedata.com/security/09248U841) | $53.5M |
| [Port Authority of New York & New Jersey](https://search.stillhousedata.com/security/73358XHF2) | $40.7M |
| [Energy Southeast A Cooperative District](https://search.stillhousedata.com/security/292723AY9) | $40.4M |
| [Commonwealth of Puerto Rico](https://search.stillhousedata.com/security/74514L4G9) | $33.5M |
| [Southeast Energy Authority A Cooperative District](https://search.stillhousedata.com/security/84136GAK1) | $33.4M |
| [Black Belt Energy Gas District](https://search.stillhousedata.com/security/09182TCQ8) | $32.9M |
| [Energy Southeast A Cooperative District](https://search.stillhousedata.com/security/292723AK9) | $32.5M |
| [Omaha Public Power District](https://search.stillhousedata.com/security/682001JU7) | $29.8M |
| [Kansas Development Finance Authority](https://search.stillhousedata.com/security/48542RU93) | $27.7M |
| [Black Belt Energy Gas District](https://search.stillhousedata.com/security/09182TDB0) | $27.0M |
| [School District of Broward County/FL](https://search.stillhousedata.com/security/115067MC1) | $26.8M |
| [Arkansas Development Finance Authority](https://search.stillhousedata.com/security/04108WCF7) | $24.9M |
| [Triborough Bridge & Tunnel Authority](https://search.stillhousedata.com/security/89602HDR5) | $24.9M |
| [California Infrastructure & Economic Development Bank](https://search.stillhousedata.com/security/13034A7E4) | $23.7M |

## More

- [CIK 799113 on SEC EDGAR (source of record)](https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=799113&type=&dateb=&owner=include&count=40)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/registrant/799113.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.