IUSB vs SPAB
iShares Trust iShares Core Universal USD Bond ETF against State Street SPDR Portfolio Aggregate Bond ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
56%
7273 shared positions
Fee gap
3 bp
SPAB is cheaper
1-year return gap
0.1 pts
IUSB is ahead
Larger fund
IUSB
$49.3B
Side by side
| IUSB | SPAB | |
|---|---|---|
| Fund | iShares Trust iShares Core Universal USD Bond ETF | State Street SPDR Portfolio Aggregate Bond ETF |
| Issuer | iShares | State Street SPDR |
| Category | Core Bond | Core Bond |
| Expense ratio | 0.06% | 0.03% |
| Assets | $49.3B | $10.4B |
| Average daily dollar volume | $474M | $86M |
| Listed | Jun 10, 2014 | May 23, 2007 |
| FrenzyCap score | 96 | 98 |
| 1-month return | −1.1% | −1.0% |
| 3-month return | −2.2% | −2.1% |
| Year to date | −4.5% | −4.6% |
| 1-year return | −5.6% | −5.8% |
| 30-day volatility | 4.8% | 5.0% |
| Worst drawdown, 1 year | −7.0% | −7.3% |
| Trailing 12-month yield | 4.37% | 4.25% |
| Holdings | 18,285 | 8,784 |
| Top 10 weight | 3.8% | 4.5% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$7.2B thru Jul 2026 | +$332M thru Jun 2026 |
| 30-day implied volatility | 7.0% | 9.3% |
| Holdings as of | as of Oct 20, 2026issuer data | as of Oct 20, 2026issuer data |
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
65% of IUSB · 82% of SPAB| Holding | IUSB | SPAB |
|---|---|---|
| TREASURY NOTE (2OLD), due Feb 15, 2036 | 0.36% | 0.41% |
| TREASURY NOTE 4.25%, due Nov 15, 2034 | 0.33% | 0.35% |
| TREASURY NOTE 4.25%, due May 15, 2035 | 0.33% | 0.50% |
| TREASURY NOTE (OLD) 4.38%, due May 15, 2036 | 0.33% | 0.35% |
| TREASURY NOTE 4.63%, due Feb 15, 2035 | 0.50% | 0.33% |
| TREASURY NOTE 3.88%, due Aug 15, 2034 | 0.32% | 0.33% |
| TREASURY NOTE 4.25%, due Aug 15, 2035 | 0.41% | 0.32% |
| TREASURY NOTE 4%, due Feb 15, 2034 | 0.31% | 0.34% |
| TREASURY NOTE 4.38%, due May 15, 2034 | 0.31% | 0.33% |
| TREASURY NOTE 4%, due Nov 15, 2035 | 0.42% | 0.29% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 0.34% | 0.28% |
| TREASURY NOTE 1.88%, due Feb 15, 2032 | 0.39% | 0.28% |
| TREASURY NOTE 3.38%, due Sep 15, 2028 | 0.28% | 0.27% |
| TREASURY NOTE 4.5%, due Nov 15, 2033 | 0.27% | 0.33% |
| TREASURY NOTE 4%, due Feb 28, 2030 | 0.27% | 0.41% |
| TREASURY NOTE 3.88%, due Aug 15, 2033 | 0.27% | 0.29% |
| TREASURY NOTE (OLD) 4.13%, due Aug 31, 2028 | 0.34% | 0.26% |
| TREASURY NOTE 3.5%, due Feb 15, 2033 | 0.26% | 0.29% |
| TREASURY NOTE 4%, due May 31, 2028 | 0.26% | 0.28% |
| TREASURY NOTE 3.63%, due Oct 31, 2030 | 0.25% | 0.24% |
| TREASURY NOTE 2.75%, due Aug 15, 2032 | 0.28% | 0.24% |
| TREASURY NOTE 4.13%, due Jun 30, 2031 | 0.32% | 0.24% |
| TREASURY NOTE 3.5%, due Oct 15, 2028 | 0.27% | 0.24% |
| TREASURY NOTE 3.88%, due Mar 31, 2031 | 0.24% | 0.38% |
| TREASURY NOTE 3.5%, due Sep 30, 2029 | 0.30% | 0.23% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · IUSB holdings · SPAB 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.