Data as of Oct 28, 2026.
JNK vs MBB: Differences, Returns & Fees
JNK's duration was 3.4 years on Jun 30, 2026 and MBB's 5.7 on Aug 31, 2026; MBB charges 0.04% to JNK's 0.40%.
askIQ about this page
askIQ about JNK and MBB
Net assets: $5.9bn on Oct 27, 2026 for State Street SPDR Bloomberg High Yield Bond ETF, and $35.5bn on Oct 28, 2026 for iShares MBS ETF.
Pair scorecard
MBB costs 0.36 points a year less; their one-year returns differ by 2.5 points; MBB is 6.1 times larger.
| Measure | JNK | MBB |
|---|---|---|
| Return | ||
| Total return, 1 year | +1.7% | −0.8% |
| Benchmark | ||
| What it tracks | Bloomberg High Yield Very Liquid Index | Bloomberg U.S. MBS Index |
| Cost and size | ||
| Expense ratio | 0.40% | 0.04% |
| Net assets, as of Oct 26, 2026 | $5.8bn | $35.6bn |
| Holdings | ||
| Holdings in common | 0% | |
Holdings in common uses holdings dated Jun 30, 2026 and Aug 31, 2026. Method
Risk and return
Dec 14, 2007 to Oct 23, 2026 · 984 weekly returnsEach against its own benchmark: JNK against AGG, Dec 14, 2007 to Oct 23, 2026; MBB against SPMB, Feb 6, 2009 to Oct 23, 2026.
JNK returned more: +141.3% to +57.4%. MBB swung less: 4.2% to 12.7%. MBB fell less at its worst: −17.4% to −38.4%.
Full scorecard
19 measures, with how each is measured Open ↓
| Measure | JNK | MBB | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +141.3% | +57.4% | JNK | Price change plus distributions, reinvested. |
| Annualized | +4.8% | +2.4% | JNK | Total return as a yearly rate. |
| Price return | −35.6% | −9.8% | MBB | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 12.7% | 4.2% | MBB | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 9.4% | 2.9% | MBB | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −38.4% | −17.4% | MBB | Deepest fall from a high to the low after it. |
| Upside capture | 54.4% | 77.8% | Share of its benchmark's rise caught in the weeks it rose. | |
| Downside capture | 35.8% | 78.4% | Share of its benchmark's fall taken in the weeks it fell. Lower is better. | |
| Beta | 1.16 | 0.76 | Not an edge | How far it moves for each 1% its benchmark moves. |
| R squared | 0.24 | 0.76 | Not an edge | Share of its weekly moves its benchmark explains. |
| Risk-adjusted | ||||
| Sharpe | 0.32 | 0.24 | JNK | Return above Treasury bills per unit of volatility. |
| Sortino | 0.43 | 0.35 | JNK | Return above Treasury bills per unit of downside deviation. |
| Treynor | 0.035 | 0.009 | Return above Treasury bills per unit of beta. | |
| Calmar | 0.12 | 0.14 | MBB | Annualized return divided by the max drawdown. |
| Against the benchmark | ||||
| Benchmark | AGG | SPMB | The ETF each fund is measured against. | |
| Alpha | +2.4% a year | +0.1% a year | Not significant | Yearly return beyond what its beta to the benchmark predicts. |
| Alpha t-stat | 0.94 | 0.26 | Not an edge | How sure the alpha is. Below 2, it could be chance. |
| Alpha range | −2.6% to +7.4% | −0.8% to +1.1% | Includes zero | The 95% range for the yearly alpha. |
| Information ratio | 0.24 | −0.03 | Return against its benchmark per unit of tracking error. | |
| Tracking error | 11.1% | 2.3% | Not an edge | How far weekly returns stray from the benchmark, annualized. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 984 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, JNK and MBB hold 0% of their money in the same securities at the same weight. Holdings dated Jun 30, 2026 and Aug 31, 2026.
half
0% in common
Only in one fund ↓
Side by side
JNK and MBB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
JNK and MBB do different jobs. What does each one do in a portfolio?
- What each follows. JNK follows Bloomberg High Yield Very Liquid Index and MBB follows Bloomberg U.S. MBS Index.
- Holdings in common. 0% of the weight is in the same securities (holdings dated Jun 30, 2026 and Aug 31, 2026).
- One-year total return. Over 1 year to Oct 28, 2026 JNK returned +1.7% and MBB −0.8% with distributions reinvested, a gap of 2.5 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.
JNK
JNK tracks the Bloomberg High Yield Bond. Over the year to Oct 28, 2026 it returned +1.7% with distributions reinvested, against −1.4% for its benchmark, the Bloomberg U.S. Aggregate Bond Index. The prospectus expense ratio is 0.40% a year.
MBB
MBB tracks an index of mortgage-backed securities. Over the year to Oct 28, 2026 it returned −0.8% with distributions reinvested, against −1.1% for its benchmark, the Bloomberg U.S. MBS Index. The prospectus expense ratio is 0.04% a year.
Questions people ask
- Which returned more over the last year, JNK or MBB?
- In the year to Oct 28, 2026, with distributions reinvested, JNK returned +1.7% and MBB −0.8%.
- Which is cheaper, JNK or MBB?
- MBB is cheaper, by 0.36 percentage points a year. That is about $36 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, JNK against MBB, data as of Oct 28, 2026. https://etfiq.com/compare/any/jnk-vs-mbb
ETFIQ. (Oct 28, 2026). JNK against MBB. Retrieved from https://etfiq.com/compare/any/jnk-vs-mbb
[JNK against MBB (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/jnk-vs-mbb)
Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.