BBTBX Holdings — Bridge Builder Core Bond Fund
Data updated: 2026-09-11
BBTBX holds 5,408 securities. The top 10 make up 12.8% of net assets, led by Future Contract on US 2yr Note (cbt) Sep26 0.00000000 (3.35%) and Fidelity Government Portfolio Cl Institutional 0.00000000 (2.82%). Mortgage / Securitized (37.4%) and Corporate Bonds (27.5%) are the largest sectors, and 96.3% of the portfolio is in United States. Debt holdings: 2,092 positions, 55.6% of assets.
Holdings cover 106.72% of net asset value. As of June 30, 2026 · N-PORT.
BBTBX Portfolio Holdings
5,408 holdings of Bridge Builder Core Bond Fund by percentage of net assets, from the fund's SEC N-PORT filing as of June 30, 2026. The 100 largest are listed below; the interactive table on this page lists all 5,408.
| Holding | Ticker | Sector | % of net assets | Value (USD) |
|---|---|---|---|---|
| Future Contract on US 2yr Note (cbt) Sep26 0.00000000 | TUU6 XCBT | Unknown | 3.35% | $951.10M |
| Fidelity Government Portfolio Cl Institutional 0.00000000 | — | Funds & ETFs | 2.82% | $800.29M |
| Future Contract on US 5yr Note (cbt) Sep26 0.00000000 | FVU6 XCBT | Unknown | 1.56% | $441.14M |
| Future Contract on US Ultra Bond Cbt Sep26 0.00000000 | WNU6 XCBT | Unknown | 0.83% | $235.22M |
| United States Treasury Note 3.37500000 | — | Government Bonds | 0.83% | $234.95M |
| United States Treasury Bond 4.25000000 | — | Government Bonds | 0.74% | $208.67M |
| Future Contract on US 10yr Note (cbt)sep26 0.00000000 | TYU6 XCBT | Unknown | 0.70% | $198.35M |
| United States Treasury Note 4.00000000 | — | Government Bonds | 0.70% | $198.00M |
| United States Treasury Note 3.50000000 | — | Government Bonds | 0.69% | $196.95M |
| United States Treasury Note 4.62500000 | — | Government Bonds | 0.61% | $172.86M |
| United States Treasury Note 4.50000000 | — | Government Bonds | 0.54% | $152.98M |
| Future Contract on US Long Bond(cbt) Sep26 0.00000000 | USU6 XCBT | Unknown | 0.53% | $149.37M |
| United States Treasury Note 3.50000000 | — | Government Bonds | 0.53% | $148.99M |
| United States Treasury Bond 1.12500000 | — | Government Bonds | 0.50% | $141.32M |
| United States Treasury Note 4.12500000 | — | Government Bonds | 0.49% | $137.60M |
| United States Treasury Note 4.25000000 | — | Government Bonds | 0.47% | $132.56M |
| United States Treasury Bond 4.62500000 | — | Government Bonds | 0.46% | $129.63M |
| United States Treasury Bond 4.12500000 | — | Government Bonds | 0.45% | $129.00M |
| United States Treasury Bond 3.37500000 | — | Government Bonds | 0.44% | $124.01M |
| United States Treasury Note 4.25000000 | — | Government Bonds | 0.41% | $117.50M |
| United States Treasury Note 4.37500000 | — | Government Bonds | 0.41% | $115.19M |
| United States Treasury Bond 1.75000000 | — | Government Bonds | 0.40% | $113.09M |
| United States Treasury Note 4.12500000 | — | Government Bonds | 0.40% | $112.55M |
| United States Treasury Note 4.00000000 | — | Government Bonds | 0.39% | $109.96M |
| United States Treasury Bond 3.87500000 | — | Government Bonds | 0.35% | $100.68M |
| United States Treasury Bond 2.37500000 | — | Government Bonds | 0.35% | $98.46M |
| United States Treasury Note 4.12500000 | — | Government Bonds | 0.33% | $94.64M |
| United States Treasury Note 2.37500000 | — | Government Bonds | 0.32% | $90.85M |
| United States Treasury Note 4.00000000 | — | Government Bonds | 0.32% | $90.64M |
| United States Treasury Bond 1.62500000 | — | Government Bonds | 0.32% | $89.76M |
| United States Treasury Note 3.50000000 | — | Government Bonds | 0.31% | $87.73M |
| United States Treasury Bond 2.87500000 | — | Government Bonds | 0.29% | $82.55M |
| United States Treasury Bond 4.62500000 | — | Government Bonds | 0.29% | $82.03M |
| United States Treasury Bond 3.00000000 | — | Government Bonds | 0.28% | $78.34M |
| United States Treasury Note 4.12500000 | — | Government Bonds | 0.26% | $74.61M |
| United States Treasury Bond 4.75000000 | — | Government Bonds | 0.25% | $71.11M |
| United States Treasury Note 4.37500000 | — | Government Bonds | 0.25% | $71.03M |
| United States Treasury Note 3.87500000 | — | Government Bonds | 0.25% | $70.19M |
| United States Treasury Note 0.75000000 | — | Government Bonds | 0.25% | $70.02M |
| United States Treasury Note 3.62500000 | — | Government Bonds | 0.25% | $69.73M |
| United States Treasury Bond 4.75000000 | — | Government Bonds | 0.24% | $68.82M |
| United States Treasury Bond 2.37500000 | — | Government Bonds | 0.24% | $68.57M |
| United States Treasury Note 2.87500000 | — | Government Bonds | 0.23% | $66.49M |
| United States Treasury Bond 2.87500000 | — | Government Bonds | 0.23% | $65.06M |
| United States Treasury Bond 4.00000000 | — | Government Bonds | 0.23% | $64.94M |
| United States Treasury Bond 3.62500000 | — | Government Bonds | 0.22% | $63.29M |
| United States Treasury Bond 3.25000000 | — | Government Bonds | 0.21% | $59.11M |
| United States Treasury Bond 2.87500000 | — | Government Bonds | 0.21% | $58.15M |
| United States Treasury Note 4.12500000 | — | Government Bonds | 0.20% | $56.91M |
| United States Treasury Bond 4.62500000 | — | Government Bonds | 0.20% | $56.34M |
| United States Treasury Note 1.75000000 | — | Government Bonds | 0.19% | $55.03M |
| United States Treasury Bond 4.62500000 | — | Government Bonds | 0.19% | $54.86M |
| United States Treasury Bond 1.87500000 | — | Government Bonds | 0.19% | $53.74M |
| United States Treasury Note 4.12500000 | — | Government Bonds | 0.19% | $52.64M |
| United States Treasury Bond 4.75000000 | — | Government Bonds | 0.18% | $51.90M |
| United States Treasury Note 3.50000000 | — | Government Bonds | 0.18% | $51.70M |
| Fannie Mae Pool Umbs P#ma4237 2.00000000 | — | Mortgage / Securitized | 0.18% | $51.56M |
| United States Treasury Bond 3.00000000 | — | Government Bonds | 0.18% | $51.49M |
| Fncl 30yr Tba 4% July 26 to Be Announced 4.00000000 | — | Mortgage / Securitized | 0.18% | $51.23M |
| Fannie Mae Pool Umbs P#ma5070 4.50000000 | — | Mortgage / Securitized | 0.18% | $50.83M |
| United States Treasury Bond 2.50000000 | — | Government Bonds | 0.18% | $50.70M |
| United States Treasury Bond 3.62500000 | — | Government Bonds | 0.18% | $50.36M |
| United States Treasury Bond 1.37500000 | — | Government Bonds | 0.18% | $49.82M |
| United States Treasury Note 3.62500000 | — | Government Bonds | 0.17% | $49.24M |
| United States Treasury Note 3.87500000 | — | Government Bonds | 0.17% | $48.58M |
| United States Treasury Note 4.12500000 | — | Government Bonds | 0.17% | $48.33M |
| Fnma 30yr Tba 4.5% Jul 26 to Be Announced 4.50000000 | — | Mortgage / Securitized | 0.17% | $47.51M |
| Freddie Mac Pool Umbs P#sd8316 5.50000000 | — | Mortgage / Securitized | 0.17% | $47.21M |
| United States Treasury Note 3.87500000 | — | Government Bonds | 0.17% | $46.84M |
| JPMorgan Chase & Co. Regd V/r 5.14800000 | — | Corporate Bonds | 0.16% | $46.06M |
| United States Treasury Strip Coupon Zcp 0.00000000 | — | Government Bonds | 0.16% | $45.92M |
| Gnma 30yr Tba 5% Jul 26 to Be Announced 5.00000000 | — | Mortgage / Securitized | 0.16% | $45.87M |
| United States Treasury Bond 2.00000000 | — | Government Bonds | 0.15% | $43.94M |
| United States Treasury Note 3.87500000 | — | Government Bonds | 0.15% | $43.84M |
| United States Treasury Bond 5.00000000 | — | Government Bonds | 0.15% | $43.67M |
| Morgan Stanley Regd V/r 5.29600000 | — | Corporate Bonds | 0.15% | $43.26M |
| NVIDIA Corp. Regd 4.25000000 | — | Corporate Bonds | 0.15% | $43.08M |
| T-Mobile USA, Inc. Regd Ser Wi 3.87500000 | — | Corporate Bonds | 0.15% | $42.91M |
| United States Treasury Bond 5.00000000 | — | Government Bonds | 0.15% | $42.58M |
| United States Treasury Strip Coupon Zcp 0.00000000 | — | Government Bonds | 0.15% | $42.47M |
| United States Treasury Strip Coupon Zcp 0.00000000 | — | Government Bonds | 0.15% | $42.35M |
| United States Treasury Strip Coupon Zcp 0.00000000 | — | Government Bonds | 0.15% | $42.33M |
| United States Treasury Note 4.25000000 | — | Government Bonds | 0.15% | $42.28M |
| Gnma2 30yr Tba 5.5% Jul 26 to Be Announced 5.50000000 | — | Mortgage / Securitized | 0.15% | $41.64M |
| United States Treasury Note 3.50000000 | — | Government Bonds | 0.15% | $41.59M |
| Wells Fargo & Company Regd V/r Mtn 5.57400000 | — | Corporate Bonds | 0.15% | $41.15M |
| Honeywell Aerospace, Inc. Regd 144a P/p 3.90000000 | — | Corporate Bonds | 0.14% | $40.89M |
| United States Treasury Bond 2.25000000 | — | Government Bonds | 0.14% | $40.70M |
| United States Treasury Note 3.75000000 | — | Government Bonds | 0.14% | $40.51M |
| United States Treasury Note 1.87500000 | — | Government Bonds | 0.14% | $40.36M |
| United States Treasury Note 4.12500000 | — | Government Bonds | 0.14% | $40.32M |
| Octagon 55 Ltd. Ser 2021-1a Cl A1r V/r Regd 144a P/p 4.93523000 | — | Mortgage / Securitized | 0.14% | $40.05M |
| United States Treasury Note 3.62500000 | — | Government Bonds | 0.14% | $39.63M |
| Fnma 30yr Tba 6% Aug 26 to Be Announced 6.00000000 | — | Mortgage / Securitized | 0.14% | $39.62M |
| Fnma 30yr Tba 3.0% Jul26 to Be Announced 3.00000000 | — | Mortgage / Securitized | 0.14% | $39.22M |
| United States Treasury Note 3.25000000 | — | Government Bonds | 0.14% | $38.97M |
| United States Treasury Note 3.62500000 | — | Government Bonds | 0.14% | $38.79M |
| Fnma 30yr Tba 5% Jul 26 to Be Announced 5.00000000 | — | Mortgage / Securitized | 0.13% | $37.89M |
| United States Treasury Note 3.75000000 | — | Government Bonds | 0.13% | $37.68M |
| United States Treasury Bond 4.25000000 | — | Government Bonds | 0.13% | $37.57M |
BBTBX Sector Allocation
Bridge Builder Core Bond Fund holdings grouped by sector, by share of the portfolio's market value.
| Sector | Weight | Holdings |
|---|---|---|
| Mortgage / Securitized | 37.4% | 3280 |
| Corporate Bonds | 27.5% | 1808 |
| Government Bonds | 27.1% | 257 |
| Funds & ETFs | 2.6% | 1 |
| Municipal Bonds | 0.5% | 37 |
| Preferred Equity | 0.0% | 1 |
| Unknown | 4.9% | 24 |
BBTBX Country Allocation
Where Bridge Builder Core Bond Fund's holdings are domiciled, by percentage of net assets (largest 15).
| Country | % of net assets |
|---|---|
| United States | 96.3% |
| Cayman Islands | 1.6% |
| United Kingdom | 1.4% |
| France | 1.2% |
| Canada | 1.1% |
| Netherlands | 0.6% |
| Japan | 0.6% |
| Mexico | 0.6% |
| Ireland | 0.5% |
| Jersey | 0.4% |
| Norway | 0.3% |
| Spain | 0.3% |
| Australia | 0.3% |
| Switzerland | 0.3% |
| Luxembourg | 0.2% |
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 | 40.4% |
| Real Estate | 5.0% |
| Cash & Equivalents | 2.8% |
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% |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.