Data as of Oct 28, 2026.
IBDU vs SPIB: Differences, Returns & Fees
IBDU's duration was 2.6 years on Jul 31, 2026 and SPIB's 4.2 on Jun 30, 2026; SPIB charges 0.04% to IBDU's 0.10%.
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Net assets on Oct 27, 2026: $4.0bn for iShares iBonds Dec 2029 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 1.4 points; SPIB is 2.9 times larger.
| Measure | IBDU | SPIB |
|---|---|---|
| Return | ||
| Total return, 1 year | +1.3% | −0.1% |
| Benchmark | ||
| What it tracks | Bloomberg December 2029 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 | $4.0bn | $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 27, 2019 to Oct 23, 2026 · 369 weekly returnsEach against its own benchmark: IBDU against IUSB, Sep 27, 2019 to Oct 23, 2026; SPIB against AGG, Feb 27, 2009 to Oct 23, 2026.
SPIB returned slightly more: +16.8% to +16.3%. SPIB swung less: 6.7% to 8.3%. SPIB fell less at its worst: −14.3% to −18.9%.
Full scorecard
19 measures, with how each is measured Open ↓
| Measure | IBDU | SPIB | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +16.3% | +16.8% | SPIB (slight) | Price change plus distributions, reinvested. |
| Annualized | +2.1% | +2.2% | SPIB (slight) | Total return as a yearly rate. |
| Price return | −10.3% | −7.7% | SPIB | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 8.3% | 6.7% | SPIB | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 6.4% | 4.9% | SPIB | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −18.9% | −14.3% | SPIB | Deepest fall from a high to the low after it. |
| Upside capture | 109.0% | 83.0% | Share of its benchmark's rise caught in the weeks it rose. | |
| Downside capture | 100.2% | 72.8% | Share of its benchmark's fall taken in the weeks it fell. Lower is better. | |
| Beta | 1.21 | 0.87 | Not an edge | How far it moves for each 1% its benchmark moves. |
| R squared | 0.80 | 0.64 | Not an edge | Share of its weekly moves its benchmark explains. |
| Risk-adjusted | ||||
| Sharpe | −0.05 | −0.07 | IBDU | Return above Treasury bills per unit of volatility. |
| Sortino | −0.06 | −0.10 | IBDU | Return above Treasury bills per unit of downside deviation. |
| Treynor | −0.003 | 0.028 | Return above Treasury bills per unit of beta. | |
| Calmar | 0.11 | 0.15 | SPIB | Annualized return divided by the max drawdown. |
| Against the benchmark | ||||
| Benchmark | IUSB | AGG | The ETF each fund is measured against. | |
| Alpha | +1.7% a year | +1.4% a year | IBDU not significant | Yearly return beyond what its beta to the benchmark predicts. |
| Alpha t-stat | 1.21 | 2.02 | Not an edge | How sure the alpha is. Below 2, it could be chance. |
| Alpha range | −1.1% to +4.4% | 0.0% to +2.8% | IBDU includes zero | The 95% range for the yearly alpha. |
| Information ratio | 0.34 | 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, 369 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, IBDU 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
IBDU and SPIB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IBDU and SPIB are built for the same job. How do they differ in cost, holdings and results?
- What each follows. IBDU follows Bloomberg December 2029 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).
- Number of holdings. IBDU holds 729 positions and SPIB holds 5398.
Data as of Oct 28, 2026.
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IBDU
IBDU tracks an index. Over the year to Oct 28, 2026 it returned +1.3% 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, IBDU or SPIB?
- In the year to Oct 28, 2026, with distributions reinvested, IBDU returned +1.3% and SPIB −0.1%.
- Which is cheaper, IBDU 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.
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ETFIQ, IBDU against SPIB, data as of Oct 28, 2026. https://etfiq.com/compare/any/ibdu-vs-spib
ETFIQ. (Oct 28, 2026). IBDU against SPIB. Retrieved from https://etfiq.com/compare/any/ibdu-vs-spib
[IBDU against SPIB (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/ibdu-vs-spib)
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