# Colorado Bridge & Tunnel Enterprise COLORADO BRIDGE & TUNNEL ENTERPRISE CO

Colorado Bridge & Tunnel Enterprise COLORADO BRIDGE & TUNNEL ENTERPRISE CO is a security (CUSIP 19633TAZ4) tracked across SEC portfolio filings. 3 registered fund positions totaling $6.6M via N-PORT as of 2026-05-31.

## Summary

- Issuer: Colorado Bridge & Tunnel Enterprise
- Class: COLORADO BRIDGE & TUNNEL ENTERPRISE CO
- CUSIP: 19633TAZ4
- Asset category: DBT
- 13F holders: 0
- N-PORT fund positions: 3
- N-PORT value: $6.6M
- N-PORT report: 2026-05-31

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [BlackRock Strategic Municipal Opportunities Fund](https://search.stillhousedata.com/fund/S000004053) | BlackRock Municipal Series Trust | $3.2M | 9.51% |
| Nuveen AMT-Free Quality Municipal Income Fund | Nuveen AMT-Free Quality Municipal Income Fund | $2.5M | 7.29% |
| Nuveen Dynamic Municipal Opportunities Fund | Nuveen Dynamic Municipal Opportunities Fund | $888K | 14.19% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/19633TAZ4.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.