MBB vs SECU
iShares MBS ETF against iShares Securitized Income Active ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
0%
4 shared positions
Fee gap
37 bp
MBB is cheaper
1-year return gap
—
Larger fund
MBB
$35.2B
Side by side
| MBB | SECU | |
|---|---|---|
| Fund | iShares MBS ETF | iShares Securitized Income Active ETF |
| Issuer | iShares | iShares |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.04% | 0.41% |
| Assets | $35.2B | $832M |
| Average daily dollar volume | $690M | $16M |
| Listed | Mar 13, 2007 | Jul 29, 2005 |
| FrenzyCap score | 98 | 61 |
| 1-month return | −1.0% | −0.5% |
| 3-month return | −2.5% | −1.7% |
| Year to date | −4.9% | — |
| 1-year return | −5.7% | — |
| 30-day volatility | 6.7% | 2.8% |
| Worst drawdown, 1 year | −8.1% | −4.8% |
| Trailing 12-month yield | 4.50% | 4.02% |
| Holdings | 10,818 | 927 |
| Top 10 weight | 6.0% | 7.4% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | −$179M thru May 2026 | +$306M thru Jul 2026 |
| 30-day implied volatility | 7.8% | — |
| 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
1% of MBB · 2% of SECU| Holding | MBB | SECU |
|---|---|---|
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 0.12% | 0.41% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 0.35% | 0.10% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 0.05% | 0.15% |
| UMBS 30YR TBA(REG A), due Nov 12, 2026 | 0.04% | 1.35% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · MBB holdings · SECU 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.