Unwrap.Fund
See how BBTBX fits your portfolio →
MF · holdings as filed 2026-03-31

What's inside BBTBX?

Bridge Builder Core Bond Fund
Holdings
5,259
positions in the fund
Top 10
13%
of fund assets
Expense ratio
0.12%
net, per year
Fund size
$26B
total net assets

Top 20 holdings

RankLogoTicker / NameWeight
1
?
—F/C US 2YR NOTE (CBT) JUN26
3.45%
2
F
FRGXXFIDELITY INV MMKT GOVT-INST
3.33%
3
?
—F/C US 5YR NOTE (CBT) JUN26
1.28%
4
?
—F/C US 10YR NOTE (CBT)JUN26
1.12%
5
?
—F/C US 10YR ULTRA FUT JUN26
0.88%
6
T
T 4 06.30.32US TREASURY N/B
0.76%
7
T
T 4.625 04.30.29US TREASURY N/B
0.65%
8
T
T 4.25 01.15.28US TREASURY N/B
0.63%
9
T
T 3.375 05.15.33US TREASURY N/B
0.61%
10
T
T 4.25 02.15.54US TREASURY N/B
0.60%
11
T
T 4.125 10.31.31US TREASURY N/B
0.57%
12
T
T 3.5 02.15.33US TREASURY N/B
0.54%
13
T
T 4.5 11.15.33US TREASURY N/B
0.54%
14
T
T 4.25 11.15.34US TREASURY N/B
0.51%
15
T
T 1.125 08.15.40US TREASURY N/B
0.50%
16
T
T 4.375 01.31.32US TREASURY N/B
0.45%
17
T
T 3.875 03.31.28US TREASURY N/B
0.44%
18
T
T 3.5 03.15.29US TREASURY N/B
0.43%
19
T
T 3.375 08.15.42US TREASURY N/B
0.43%
20
T
T 3.875 05.15.43US TREASURY N/B
0.35%
Sectors
Top holdings — Bonds & Fixed Income
Your 10 largest positions in this sector
1
T
T 4 06.30.32US TREASURY N/B
0.76%
2
T
T 4.625 04.30.29US TREASURY N/B
0.65%
3
T
T 4.25 01.15.28US TREASURY N/B
0.63%
4
T
T 3.375 05.15.33US TREASURY N/B
0.61%
5
T
T 4.25 02.15.54US TREASURY N/B
0.60%
6
T
T 4.125 10.31.31US TREASURY N/B
0.57%
7
T
T 3.5 02.15.33US TREASURY N/B
0.54%
8
T
T 4.5 11.15.33US TREASURY N/B
0.54%
9
T
T 4.25 11.15.34US TREASURY N/B
0.51%
10
T
T 1.125 08.15.40US TREASURY N/B
0.50%
Geography
Top holdings — United States
Your 10 largest positions in this country
1
F
FRGXXFIDELITY INV MMKT GOVT-INST
3.33%
2
T
T 4 06.30.32US TREASURY N/B
0.76%
3
T
T 4.625 04.30.29US TREASURY N/B
0.65%
4
T
T 4.25 01.15.28US TREASURY N/B
0.63%
5
T
T 3.375 05.15.33US TREASURY N/B
0.61%
6
T
T 4.25 02.15.54US TREASURY N/B
0.60%
7
T
T 4.125 10.31.31US TREASURY N/B
0.57%
8
T
T 3.5 02.15.33US TREASURY N/B
0.54%
9
T
T 4.5 11.15.33US TREASURY N/B
0.54%
10
T
T 4.25 11.15.34US TREASURY N/B
0.51%
Geography reflects each issuer's registered business address per SEC EDGAR filings where available, falling back to the exchange or listing where no SEC filing exists — not necessarily where a company's stock is primarily listed (e.g. TSMC is classified as Taiwan even though its ADR trades on the NYSE).
Hold BBTBX alongside other funds? See your combined true holdings, overlap, and blended fees — free, no signup.
Unwrap your portfolio →
Funds similar to BBTBX
BNDVANGUARD TOTAL BOND MARKET INDEX FUND
22% overlap
Compare →
VBTLXVANGUARD TOTAL BOND MARKET INDEX FUND
22% overlap
Compare →
SCHZSchwab U.S. Aggregate Bond ETF
22% overlap
Compare →
BAGIXBaird Aggregate Bond Fund
22% overlap
Compare →
AGGiShares Core U.S. Aggregate Bond ETF
21% overlap
Compare →
SSAFXState Street Aggregate Bond Index Portfolio
21% overlap
Compare →
Data source: official SEC Form N-PORT filings (as of 2026-03-31); expense ratio from SEC prospectus (risk/return) filings. Fund holdings are disclosed quarterly and may reflect a 60-day reporting delay.
Informational and educational only — not investment advice.