BBTBX — Bridge Builder Core Bond Fund
Data updated: 2026-09-11
BBTBX — Bridge Builder Core Bond Fund. Long Total / Aggregate Bond · $28.36B AUM · 0.12% expense ratio. Holdings, fees, performance and SEC filings.
BBTBX Fund Overview
BBTBX — Bridge Builder Core Bond Fund is a US mutual fund managed by Bridge Builder Trust, categorised as Long Total / Aggregate 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 Total / Aggregate Bond
- Assets under management: $28.36B
- 1-year return: 4.0%
- Ticker: BBTBX
- SEC CIK: 0001567101
- SEC series ID: S000040853
- Share class ID: C000126648
BBTBX Holdings
Top 10 holdings of Bridge Builder Core Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| F/c US 2yr Note (cbt) Sep26 | 3.35% |
| Fidelity Inv Mmkt Govt-Inst | 2.82% |
| F/c US 5yr Note (cbt) Sep26 | 1.56% |
| F/c US Ultra Bond Cbt Sep26 | 0.83% |
| US Treas Nts 3.375% 05/15/33 | 0.83% |
| Wi Treasury SE 4.250% 02/15/54 | 0.74% |
| US Treas Nts 4% 06/30/32 | 0.70% |
| US Treas Nts 3.5% 03/15/29 | 0.69% |
| US Treas Nts 4.625% 04/30/29 | 0.61% |
| US Treas Nts 4.5% 11/15/33 | 0.54% |
BBTBX Portfolio Allocation
Asset-class allocation of Bridge Builder Core Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 58.6% |
| Securitized | 40.1% |
| Real Estate | 5.0% |
| Cash & Equivalents | 2.8% |
BBTBX Performance
Total returns for BBTBX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.8% |
| 1 year | 4.0% |
| 3 years (annualised) | 4.7% |
| 5 years (annualised) | 0.5% |
BBTBX Risk Information
Risk metrics for BBTBX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.0%
BBTBX Costs and Fees
BBTBX costs about $12 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.12%
- Gross expense ratio: 0.34%
- Portfolio turnover: 125%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
BBTBX Cashflows
Over the 12 months to 2026-06, Bridge Builder Core Bond Fund had net inflows of $6.87B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $463.85M |
| 2026-05 | $485.21M |
| 2026-04 | $1.18B |
| 2026-03 | $717.06M |
| 2026-02 | $383.34M |
| 2026-01 | $356.00M |
BBTBX Debt Constituents
Largest debt holdings of Bridge Builder Core Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| US Treas Nts 3.375% 05/15/33 | 0.83% |
| Wi Treasury SE 4.250% 02/15/54 | 0.74% |
| US Treas Nts 4% 06/30/32 | 0.70% |
| US Treas Nts 3.5% 03/15/29 | 0.69% |
| US Treas Nts 4.625% 04/30/29 | 0.61% |
| US Treas Nts 4.5% 11/15/33 | 0.54% |
| US Treas Nts 3.5% 02/15/33 | 0.53% |
| US Treas Bds 1.125% 08/15/40 | 0.50% |
| US Treas Nts 4.125% 06/30/28 | 0.49% |
| US Treas Nts 4.25% 11/15/34 | 0.47% |
BBTBX Prospectus and SEC Filings
Official Bridge Builder Core 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 Total / Aggregate 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.