BBTBX — Bridge Builder Core Bond Fund
Data updated: 2026-05-22
BBTBX — Bridge Builder Core Bond Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Total / Aggregate Bond · $26.34B AUM · 0.12% expense ratio · 4.7% 1-yr return. From SEC regulatory 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: $26.34B
- 1-year return: 4.7%
- 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) Jun26 | 3.78% |
| Fidelity Inv Mmkt Govt-Inst | 3.66% |
| F/c US 5yr Note (cbt) Jun26 | 1.40% |
| F/c US 10yr Note (cbt)jun26 | 1.23% |
| F/c US 10yr Ultra Fut Jun26 | 0.96% |
| US Treas Nts 4% 06/30/32 | 0.84% |
| US Treas Nts 4.625% 04/30/29 | 0.71% |
| US Treas Nts 4.25% 01/15/28 | 0.69% |
| US Treas Nts 3.375% 05/15/33 | 0.67% |
| Wi Treasury SE 4.250% 02/15/54 | 0.66% |
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 | 57.8% |
| Securitized | 41.1% |
| Real Estate | 7.2% |
| Equity | 3.7% |
BBTBX Performance
Total returns for BBTBX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.1% |
| 1 year | 4.7% |
| 3 years (annualised) | 4.3% |
| 5 years (annualised) | 0.8% |
BBTBX Risk Information
Risk metrics for BBTBX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.4%
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 2026-03, Bridge Builder Core Bond Fund had net inflows of $6.32B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | $717.06M |
| 2026-02 | $383.34M |
| 2026-01 | $356.00M |
| 2025-12 | $326.51M |
| 2025-11 | $386.63M |
| 2025-10 | $658.66M |
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 4% 06/30/32 | 0.84% |
| US Treas Nts 4.625% 04/30/29 | 0.71% |
| US Treas Nts 4.25% 01/15/28 | 0.69% |
| US Treas Nts 3.375% 05/15/33 | 0.67% |
| Wi Treasury SE 4.250% 02/15/54 | 0.66% |
| US Treas Nts 4.125% 10/31/31 | 0.63% |
| US Treas Nts 3.5% 02/15/33 | 0.59% |
| US Treas Nts 4.5% 11/15/33 | 0.59% |
| US Treas Nts 4.25% 11/15/34 | 0.55% |
| US Treas Bds 1.125% 08/15/40 | 0.55% |
BBTBX Prospectus and SEC Filings
Official Bridge Builder Core Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
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.