Data as of Oct 28, 2026.
IBDT vs SPIB: Differences, Returns & Fees
IBDT's duration was 1.7 years on Jul 31, 2026 and SPIB's 4.2 on Jun 30, 2026; SPIB charges 0.04% to IBDT's 0.10%.
askIQ about this page
askIQ about IBDT and SPIB
Net assets on Oct 27, 2026: $4.1bn for iShares iBonds Dec 2028 Term Corporate ETF and $11.6bn for State Street SPDR Portfolio Intermediate Term Corporate Bond ETF.
Pair scorecard
SPIB costs 0.06 points a year less; their one-year returns differ by 2.4 points; SPIB is 2.8 times larger.
| Measure | IBDT | SPIB |
|---|---|---|
| Return | ||
| Total return, 1 year | +2.3% | −0.1% |
| Benchmark | ||
| What it tracks | Bloomberg December 2028 Maturity Corporate Index | Bloomberg U.S. Intermediate Corporate Bond Index |
| Cost and size | ||
| Expense ratio | 0.10% | 0.04% |
| Net assets, as of Oct 27, 2026 | $4.1bn | $11.6bn |
| Holdings | ||
| Holdings in common | 11% | |
Holdings in common uses holdings dated Jun 30, 2026 and Jul 31, 2026. Method
Risk and return
Sep 28, 2018 to Oct 23, 2026 · 421 weekly returnsEach against its own benchmark: IBDT against IUSB, Sep 28, 2018 to Oct 23, 2026; SPIB against AGG, Feb 27, 2009 to Oct 23, 2026.
IBDT returned more: +34.1% to +27.7%. SPIB swung less: 6.3% to 7.5%. SPIB fell less at its worst: −14.3% to −17.8%.
Full scorecard
19 measures, with how each is measured Open ↓
| Measure | IBDT | SPIB | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +34.1% | +27.7% | IBDT | Price change plus distributions, reinvested. |
| Annualized | +3.7% | +3.1% | IBDT | Total return as a yearly rate. |
| Price return | −0.8% | −2.3% | IBDT | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 7.5% | 6.3% | SPIB | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 5.8% | 4.7% | SPIB | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −17.8% | −14.3% | SPIB | Deepest fall from a high to the low after it. |
| Upside capture | 98.0% | 83.0% | Share of its benchmark's rise caught in the weeks it rose. | |
| Downside capture | 87.1% | 72.8% | Share of its benchmark's fall taken in the weeks it fell. Lower is better. | |
| Beta | 1.11 | 0.87 | Not an edge | How far it moves for each 1% its benchmark moves. |
| R squared | 0.74 | 0.64 | Not an edge | Share of its weekly moves its benchmark explains. |
| Risk-adjusted | ||||
| Sharpe | 0.15 | 0.06 | IBDT | Return above Treasury bills per unit of volatility. |
| Sortino | 0.19 | 0.09 | IBDT | Return above Treasury bills per unit of downside deviation. |
| Treynor | 0.010 | 0.028 | Return above Treasury bills per unit of beta. | |
| Calmar | 0.21 | 0.21 | SPIB (slight) | Annualized return divided by the max drawdown. |
| Against the benchmark | ||||
| Benchmark | IUSB | AGG | The ETF each fund is measured against. | |
| Alpha | +1.8% a year | +1.4% a year | IBDT not significant | Yearly return beyond what its beta to the benchmark predicts. |
| Alpha t-stat | 1.32 | 2.02 | Not an edge | How sure the alpha is. Below 2, it could be chance. |
| Alpha range | −0.9% to +4.4% | 0.0% to +2.8% | IBDT includes zero | The 95% range for the yearly alpha. |
| Information ratio | 0.44 | 0.42 | Return against its benchmark per unit of tracking error. | |
| Tracking error | 3.9% | 3.0% | Not an edge | How far weekly returns stray from the benchmark, annualized. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 421 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, IBDT and SPIB hold 11% of their money in the same securities at the same weight. Holdings dated Jun 30, 2026 and Jul 31, 2026.
half
11% in common
Only in one fund ↓
Side by side
IBDT and SPIB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IBDT and SPIB are built for the same job. How do they differ in cost, holdings and results?
- What each follows. IBDT follows Bloomberg December 2028 Maturity Corporate Index and SPIB follows Bloomberg U.S. Intermediate Corporate Bond Index.
- Holdings in common. 11% of the weight is in the same securities (holdings dated Jul 31, 2026 and Jun 30, 2026).
- One-year total return. Over 1 year to Oct 28, 2026 IBDT returned +2.3% and SPIB −0.1% with distributions reinvested, a gap of 2.4 points.
Data as of Oct 28, 2026.
The two-page PDF for this pair is coming. Save the comparison to follow its changes. Free. It needs an email sign-in, once.
IBDT
IBDT tracks an index. Over the year to Oct 28, 2026 it returned +2.3% with distributions reinvested, against −1.2% for its benchmark, the Bloomberg U.S. Universal Index. The prospectus expense ratio is 0.10% a year.
SPIB
SPIB tracks an index. Over the year to Oct 28, 2026 it returned −0.1% with distributions reinvested, against −1.4% for its benchmark, the Bloomberg U.S. Aggregate Bond Index. The prospectus expense ratio is 0.04% a year.
Questions people ask
- Which returned more over the last year, IBDT or SPIB?
- In the year to Oct 28, 2026, with distributions reinvested, IBDT returned +2.3% and SPIB −0.1%.
- Which is cheaper, IBDT or SPIB?
- SPIB is cheaper, by 0.06 percentage points a year. That is about $6 on $10,000 held for a year. Fees come from each fund's prospectus.
Links are sources, not endorsements. A comparison is not a recommendation.
How this is computed
Overlap adds up the smaller of the two weights for each security both funds hold.
Cite this pageCitation, APA and Markdown
ETFIQ, IBDT against SPIB, data as of Oct 28, 2026. https://etfiq.com/compare/any/ibdt-vs-spib
ETFIQ. (Oct 28, 2026). IBDT against SPIB. Retrieved from https://etfiq.com/compare/any/ibdt-vs-spib
[IBDT against SPIB (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/ibdt-vs-spib)
Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.