BBMUX — Bridge Builder Municipal Bond Fund
Data updated: 2026-09-11
BBMUX — Bridge Builder Municipal Bond Fund. Long Municipal - National Bond · $20.79B AUM · 0.12% expense ratio. Holdings, fees, performance and SEC filings.
BBMUX Fund Overview
BBMUX — Bridge Builder Municipal Bond Fund is a US mutual fund managed by Bridge Builder Trust, categorised as Long Municipal - National Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Bridge Builder Trust
- Category: Long Municipal - National Bond
- Assets under management: $20.79B
- 1-year return: 6.3%
- Ticker: BBMUX
- SEC CIK: 0001567101
- SEC series ID: S000050632
- Share class ID: C000159840
BBMUX Holdings
Top 10 holdings of Bridge Builder Municipal Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Fidelity Inv Mmkt Govt-Inst | 0.94% |
| Southeast Energy A 5% 10/01/30 | 0.46% |
| Kentucky St Publi V/r 01/01/55 | 0.37% |
| California Cmnty V/r 01/01/55 | 0.29% |
| Puerto Rico SA 4.329% 07/01/40 | 0.28% |
| Miami-Dade Cnty Fl 5% 10/01/32 | 0.26% |
| Chicago Il Brd Of 6% 04/01/46 | 0.26% |
| Main Street Energy 5% 10/01/33 | 0.25% |
| Black Belt Energy 5% 11/01/36 | 0.24% |
| Univ Of Texas Tx V/r 08/01/56 | 0.24% |
BBMUX Portfolio Allocation
Asset-class allocation of Bridge Builder Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 96.2% |
| Securitized | 1.5% |
| Cash & Equivalents | 1.0% |
BBMUX Performance
Total returns for BBMUX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 1.9% |
| 1 year | 6.3% |
| 3 years (annualised) | 4.3% |
| 5 years (annualised) | 1.5% |
BBMUX Risk Information
Risk metrics for BBMUX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.5%
BBMUX Costs and Fees
BBMUX costs about $12 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.12%
- Gross expense ratio: 0.38%
- Portfolio turnover: 37%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
BBMUX Cashflows
Over the 12 months to 2026-06, Bridge Builder Municipal Bond Fund had net inflows of $3.09B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $471.74M |
| 2026-05 | $111.01M |
| 2026-04 | −$153.73M |
| 2026-03 | $292.97M |
| 2026-02 | $378.72M |
| 2026-01 | $379.66M |
BBMUX Debt Constituents
Largest debt holdings of Bridge Builder Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Southeast Energy A 5% 10/01/30 | 0.46% |
| Kentucky St Publi V/r 01/01/55 | 0.37% |
| California Cmnty V/r 01/01/55 | 0.29% |
| Puerto Rico SA 4.329% 07/01/40 | 0.28% |
| Miami-Dade Cnty Fl 5% 10/01/32 | 0.26% |
| Chicago Il Brd Of 6% 04/01/46 | 0.26% |
| Main Street Energy 5% 10/01/33 | 0.25% |
| Black Belt Energy 5% 11/01/36 | 0.24% |
| Univ Of Texas Tx V/r 08/01/56 | 0.24% |
| Tennessee St Energ 5% 12/01/35 | 0.24% |
BBMUX Prospectus and SEC Filings
Official Bridge Builder Municipal Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2025-10-27
- Prospectus (485BPOS) — filed 2024-10-25
- Prospectus (485BPOS) — filed 2023-10-27
- Portfolio holdings (N-PORT) — filed 2026-08-26
- Portfolio holdings (N-PORT) — filed 2026-05-22
- Portfolio holdings (N-PORT) — filed 2026-02-23
- Annual census (N-CEN) — filed 2026-09-11
- Annual census (N-CEN) — filed 2025-09-11
Related Funds
Other Long Municipal - National Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.