IUSB vs MFSB
iShares Trust iShares Core Universal USD Bond ETF against MFS Active Core Plus Bond ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
3%
173 shared positions
Fee gap
28 bp
IUSB is cheaper
1-year return gap
0.1 pts
IUSB is ahead
Larger fund
IUSB
$49.2B
Side by side
| IUSB | MFSB | |
|---|---|---|
| Fund | iShares Trust iShares Core Universal USD Bond ETF | MFS Active Core Plus Bond ETF |
| Issuer | iShares | MFS |
| Category | Core Bond | Core Bond |
| Expense ratio | 0.06% | 0.34% |
| Assets | $49.2B | $602M |
| Average daily dollar volume | $455M | $7.8M |
| Listed | Jun 10, 2014 | Dec 4, 2024 |
| FrenzyCap score | 97 | 62 |
| 1-month return | −0.5% | −0.7% |
| 3-month return | −2.9% | −3.0% |
| Year to date | −4.5% | −4.5% |
| 1-year return | −5.2% | −5.2% |
| 30-day volatility | 4.8% | 5.0% |
| Worst drawdown, 1 year | −7.0% | −6.9% |
| Trailing 12-month yield | 4.37% | 4.76% |
| Holdings | 18,260 | 411 |
| Top 10 weight | 3.8% | 24.1% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$7.2B thru Jul 2026 | +$197M thru May 2026 |
| 30-day implied volatility | 6.4% | — |
| Holdings as of | as of Oct 14, 2026issuer data | as of May 31, 2026SEC filing |
Returns are price returns and exclude distributions. Flows are each fund's own latest reported months and may not cover the same period.
Largest shared holdings
3% of IUSB · 62% of MFSB| Holding | IUSB | MFSB |
|---|---|---|
| TREASURY BOND 4.5%, due Nov 15, 2054 | 0.21% | 1.18% |
| TREASURY BOND 4.63%, due Nov 15, 2044 | 0.18% | 1.23% |
| TREASURY NOTE 4.13%, due Oct 31, 2029 | 0.17% | 3.22% |
| TREASURY NOTE 3.88%, due Jul 31, 2030 | 0.17% | 3.49% |
| TREASURY BOND 4.63%, due Nov 15, 2055 | 0.16% | 3.84% |
| TREASURY BOND 4.88%, due Aug 15, 2045 | 0.15% | 1.19% |
| TREASURY BOND 4.75%, due Aug 15, 2055 | 0.15% | 0.34% |
| TREASURY BOND 4.25%, due Feb 15, 2054 | 0.14% | 0.72% |
| FNMA 30YR UMBS, due Mar 1, 2052 | 0.13% | 0.25% |
| TREASURY BOND 4.5%, due Feb 15, 2044 | 0.13% | 0.42% |
| TREASURY BOND 4.63%, due Nov 15, 2045 | 0.12% | 7.75% |
| FHLMC 30YR UMBS SUPER, due Mar 1, 2052 | 0.07% | 0.29% |
| FNMA 30YR UMBS, due Dec 1, 2054 | 0.06% | 0.49% |
| FHLMC 30YR UMBS SUPER, due Oct 1, 2054 | 0.09% | 0.04% |
| FNMA 30YR UMBS, due Apr 1, 2052 | 0.07% | 0.04% |
| FHLMC 30YR UMBS SUPER, due May 1, 2052 | 0.03% | 0.29% |
| GNMA2 30YR, due Apr 20, 2052 | 0.02% | 0.10% |
| BOEING CO 5.8%, due May 1, 2050 | 0.01% | 0.04% |
| GNMA2 30YR, due Apr 20, 2052 | 0.01% | 0.07% |
| BANK OF AMERICA CORP MTN 5.29%, due Apr 25, 2034 | 0.01% | 0.08% |
| QUIKRETE HOLDINGS INC 144A, due Mar 1, 2032 | 0.01% | 0.35% |
| FHLMC 30YR UMBS SUPER, due May 1, 2052 | 0.01% | 0.15% |
| MEXICO (UNITED MEXICAN STATES) (GO 6.88%, due May 13, 2037 | 0.01% | 0.15% |
| MEXICO (UNITED MEXICAN STATES) (GO 6%, due May 7, 2036 | 0.01% | 0.05% |
| WELLS FARGO & COMPANY MTN 3.35%, due Mar 2, 2033 | 0.01% | 0.11% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · IUSB holdings · MFSB holdings
Fund data comes from each fund's SEC filings and issuer disclosures and is shown with the date it is as of. SEC portfolio and flow filings become public about 60 days after the period they cover. Nothing here is investment advice; see Terms.