MBB vs MBSD
iShares MBS ETF against Northern Trust Disciplined Duration MBS ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
1%
66 shared positions
Fee gap
16 bp
MBB is cheaper
1-year return gap
0.2 pts
MBSD is ahead
Larger fund
MBB
$36.0B
Side by side
| MBB | MBSD | |
|---|---|---|
| Fund | iShares MBS ETF | Northern Trust Disciplined Duration MBS ETF |
| Issuer | iShares | Northern Trust FlexShares |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.04% | 0.20% |
| Assets | $36.0B | $89M |
| Average daily dollar volume | $545M | $263K |
| Listed | Mar 13, 2007 | Sep 3, 2014 |
| FrenzyCap score | 98 | 52 |
| 1-month return | +2.6% | +1.8% |
| 3-month return | −0.9% | −0.8% |
| Year to date | −3.3% | −2.7% |
| 1-year return | −3.0% | −2.9% |
| 30-day volatility | 5.4% | 4.6% |
| Worst drawdown, 1 year | −8.1% | −6.2% |
| Trailing 12-month yield | 4.43% | 4.13% |
| Holdings | 10,809 | 484 |
| Top 10 weight | 6.2% | 16.9% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$1.6B thru Aug 2026 | −$4.1M thru Jul 2026 |
| 30-day implied volatility | 7.1% | — |
| Holdings as of | as of Nov 6, 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
1% of MBB · 17% of MBSD| Holding | MBB | MBSD |
|---|---|---|
| GNMA2 30YR, due Dec 20, 2051 | 0.53% | 0.94% |
| GNMA2 30YR, due Jul 20, 2054 | 0.25% | 0.26% |
| GNMA2 30YR, due Dec 20, 2052 | 0.12% | 0.46% |
| GNMA2 30YR, due Mar 20, 2052 | 0.10% | 0.87% |
| GNMA2 30YR, due Feb 20, 2048 | 0.04% | 0.70% |
| GNMA2 30YR, due Feb 20, 2052 | 0.03% | 0.96% |
| GNMA 30YR, due Oct 20, 2047 | 0.02% | 0.29% |
| GNMA2 30YR, due Nov 20, 2049 | 0.01% | 1.18% |
| FHLMC GOLD 30YR GIANT, due Jul 1, 2040 | 0.01% | 0.03% |
| FNMA 30YR, due Feb 1, 2043 | 0.01% | 0.08% |
| FGOLD 15YR GIANT, due Feb 1, 2032 | 0.01% | 0.75% |
| GNMA2 30YR, due Jan 20, 2049 | 0.00% | 0.23% |
| FGOLD 30YR GIANT, due Sep 1, 2045 | 0.00% | 0.01% |
| GNMA2 30YR, due May 20, 2048 | 0.00% | 0.10% |
| FHLMC 30YR UMBS SUPER, due Oct 1, 2053 | 0.00% | 0.29% |
| FHLMC 15YR UMBS SUPER, due Apr 1, 2037 | 0.00% | 0.56% |
| FNMA 30YR, due Jan 1, 2042 | 0.00% | 0.01% |
| FNMA 30YR, due Feb 1, 2043 | 0.00% | 0.03% |
| FNMA 15YR, due Dec 1, 2032 | 0.00% | 0.87% |
| FNMA 30YR UMBS SUPER, due Feb 1, 2049 | 0.00% | 0.06% |
| FGOLD 30YR GIANT, due Feb 1, 2045 | 0.00% | 0.06% |
| FNMA 30YR UMBS SUPER, due Jul 1, 2050 | 0.00% | 0.58% |
| FGOLD 15YR GIANT, due Sep 1, 2032 | 0.00% | 0.41% |
| FNMA 30YR, due Jan 1, 2043 | 0.00% | 0.10% |
| FNMA 30YR, due May 1, 2038 | 0.00% | 0.01% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · MBB holdings · MBSD 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.