MBB vs NSCI
iShares MBS ETF against Nuveen Securitized Income ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
0%
2 shared positions
Fee gap
34 bp
MBB is cheaper
1-year return gap
3.9 pts
NSCI is ahead
Larger fund
MBB
$35.5B
Side by side
| MBB | NSCI | |
|---|---|---|
| Fund | iShares MBS ETF | Nuveen Securitized Income ETF |
| Issuer | iShares | Nuveen |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.04% | 0.38% |
| Assets | $35.5B | $207M |
| Average daily dollar volume | $658M | $2.0M |
| Listed | Mar 13, 2007 | Sep 23, 2025 |
| FrenzyCap score | 98 | 52 |
| 1-month return | −0.7% | −0.6% |
| 3-month return | −3.4% | −1.4% |
| Year to date | −4.9% | −1.3% |
| 1-year return | −5.2% | −1.3% |
| 30-day volatility | 6.7% | 1.2% |
| Worst drawdown, 1 year | −8.1% | −2.5% |
| Trailing 12-month yield | 4.49% | 4.73% |
| Holdings | 10,852 | 222 |
| Top 10 weight | 6.0% | 15.7% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | −$179M thru May 2026 | +$65M thru Jul 2026 |
| 30-day implied volatility | 8.0% | — |
| Holdings as of | as of Oct 14, 2026issuer data | as of Jul 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
0% of MBB · 1% of NSCI| Holding | MBB | NSCI |
|---|---|---|
| FNMA 30YR UMBS, due Aug 1, 2053 | 0.08% | 0.79% |
| FNMA 30YR UMBS, due Aug 1, 2053 | 0.04% | 0.22% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · MBB holdings · NSCI 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.