Published registry · Registry rank 1497 · Portfolio as of 2026-06-30
Bridge Builder Tax Managed Small/Mid Cap Fund
BBTSX (Bridge Builder Tax Managed Small/Mid Cap Fund)
The verdict
What the numbers say
This portfolio genuinely differs from the S&P MidCap 400 (70.6% active share). Its 0.39% fee buys real active management; whether it earned that fee is not something holdings can show.
Data provenance
Run fffcd45a-98bb-4e8e-b699-e94626fa3ab3; method closet-index@3.0.0; fund accession 0001003715-26-003054; comparison periods and expense-filing links appear with their figures. Machine capture time: 2026-09-01T09:31:36.244Z.
Computed rule checks
1 warning · 0 checks clear · 2 checks need source inputs
Warning
· Rule 1
The fund’s filed benchmark and its closest approved index control point to different comparisons.
Methodology rule · visual rules si-visual-explainers@1.0.0
No positive-fee index control is available
· Rule 2
The active-share, filed-fee, or same-index control input needed for this warning is unavailable.
Methodology rule · visual rules si-visual-explainers@1.0.0
No complete licensed window with a filed fee
· Rule 3
No complete licensed window and filed headline fee are available together for this check.
Computed on licensed market-return history · filed fee as of 2025-06-30
Methodology rule · visual rules si-visual-explainers@1.0.0
Filed fees in dollars
SEC-convention illustration
Computed from SEC filings
Assumptions for each dollar figure: $100,000 starting amount · 5.0% annual return · annual compounding · fees deducted annually · 0.01% computed index-control baseline. Methodology.
| Share class and filing | 10 years | 20 years | 30 years |
|---|---|---|---|
| BBTSX0.39% · SEC expense filing · as of 2025-06-30 | $5,795 | $18,525 | $44,420 |
Real trailing windows
Real trailing windows are not available for this registry mark.
The licensed-history computation was introduced after this immutable mark. No return history has been padded or extrapolated.
These figures are illustrations, not predictions or personalized advice. Returns and fees can differ. Read the research disclaimer.
Change the illustration
Computed from SEC filings
Assumptions for the dollar figures below: $100,000 starting amount; 5.0% annual return; 20 years; annual compounding; fees deducted annually; 0.01% computed index-control baseline. BBTSX SEC expense filing, as of 2025-06-30. Methodology.
| Result | Amount |
|---|---|
| Ending value at baseline | $264,825 |
| Ending value at filed expense ratio | $246,300 |
| Difference attributed to fee drag | $18,525 |
This is an illustration, not a prediction or personalized advice. Returns and fees can differ. Read the research disclaimer.
Largest active differences vs the S&P MidCap 400
The bars are labeled and repeated in the table; color is not the only signal. Linked company names open Buy Like Buffett’s company record; Sensible Investor does not score stocks.
| Holding | Fund | S&P MidCap 400 | Difference |
|---|---|---|---|
| COMFORT SYSTEMS USA INC | 1.57% | 0.00% | +1.57% |
| FTAI AVIATION LTD | 1.00% | 0.00% | +1.00% |
| ASCENDIS PHARMA A/S | 0.88% | 0.00% | +0.88% |
| KEYSIGHT TECHNOLOGIES IN | 0.79% | 0.00% | +0.79% |
| CURTISS-WRIGHT CORP | 0.00% | 0.77% | -0.77% |
| TWILIO INC | 0.10% | 0.86% | -0.76% |
| ILLUMINA INC | 0.00% | 0.73% | -0.73% |
| STERLING INFRASTRUCTURE INC | 0.00% | 0.71% | -0.71% |
| GATES INDUSTRIAL CORP PLC | 0.65% | 0.00% | +0.65% |
| NVENT ELECTRIC PLC | 0.11% | 0.76% | -0.65% |
Source and verification
SEC N-PORT filing · filed 2026-08-26 · period 2026-06-30
SEC expense filing · period 2025-06-30
Cite these figures
Each snippet includes the figure’s source-event date and immutable verification URL.
Best-fit active share
Sensible Investor, “Bridge Builder Tax Managed Small/Mid Cap Fund — best-fit active share,” 70.6% versus the S&P MidCap 400, fund portfolio as of 2026-06-30; measured against the filed holdings of iShares Core S&P Mid-Cap ETF (IJH), as of 2026-06-30. https://sensible-investor.com/registry/bbtsx/as-of/fffcd45a-98bb-4e8e-b699-e94626fa3ab3
BBTSX filed expense ratio
Sensible Investor, “Bridge Builder Tax Managed Small/Mid Cap Fund — filed expense ratio,” 0.39% for BBTSX, as of 2025-06-30. https://sensible-investor.com/registry/bbtsx/as-of/fffcd45a-98bb-4e8e-b699-e94626fa3ab3
BBTSX fee per active unit
Sensible Investor, “Bridge Builder Tax Managed Small/Mid Cap Fund — fee per unit of active management,” 0.55% using the BBTSX expense ratio as of 2025-06-30 and fund portfolio as of 2026-06-30. https://sensible-investor.com/registry/bbtsx/as-of/fffcd45a-98bb-4e8e-b699-e94626fa3ab3