ASEC vs MBB
American Century Securitized Credit ETF against iShares MBS ETF: cost, size, returns, what they hold and how much of it is the same.
Fee gap
25 bp
MBB is cheaper
1-year return gap
—
Larger fund
MBB
$35.6B
Side by side
| ASEC | MBB | |
|---|---|---|
| Fund | American Century Securitized Credit ETF | iShares MBS ETF |
| Issuer | American Century | iShares |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.29% | 0.04% |
| Assets | $20M | $35.6B |
| Average daily dollar volume | $4K | $591M |
| Listed | May 27, 2026 | Mar 13, 2007 |
| FrenzyCap score | 18 | 98 |
| 1-month return | −1.1% | −1.8% |
| 3-month return | −1.7% | −3.7% |
| Year to date | — | −5.7% |
| 1-year return | — | −5.6% |
| 30-day volatility | 2.2% | 6.6% |
| Worst drawdown, 1 year | −2.4% | −8.1% |
| Trailing 12-month yield | 1.81% | 4.53% |
| Holdings | 49 | 10,858 |
| Top 10 weight | 63.5% | 6.0% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$20M thru May 2026 | −$179M thru May 2026 |
| 30-day implied volatility | — | 7.7% |
| Holdings as of | as of May 31, 2026SEC filing | as of Oct 8, 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.
More: full overlap table · ASEC holdings · MBB 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.