JMBS vs MBB
Janus Henderson Mortgage-Backed Securities ETF against iShares MBS ETF: cost, size, returns, what they hold and how much of it is the same.
Overlap by weight
2%
13 shared positions
Fee gap
17 bp
MBB is cheaper
1-year return gap
1.2 pts
MBB is ahead
Larger fund
MBB
$35.2B
Side by side
| JMBS | MBB | |
|---|---|---|
| Fund | Janus Henderson Mortgage-Backed Securities ETF | iShares MBS ETF |
| Issuer | Janus Henderson | iShares |
| Category | Mortgage & Securitized | Mortgage & Securitized |
| Expense ratio | 0.21% | 0.04% |
| Assets | $6.2B | $35.2B |
| Average daily dollar volume | $50M | $676M |
| Listed | Sep 12, 2018 | Mar 13, 2007 |
| FrenzyCap score | 76 | 98 |
| 1-month return | −1.7% | −1.2% |
| 3-month return | −3.7% | −2.9% |
| Year to date | −6.2% | −5.0% |
| 1-year return | −6.8% | −5.6% |
| 30-day volatility | 7.0% | 6.7% |
| Worst drawdown, 1 year | −9.1% | −8.1% |
| Trailing 12-month yield | 5.48% | 4.50% |
| Holdings | 445 | 10,818 |
| Top 10 weight | 58.9% | 6.0% |
| Look-through P/E | — | — |
| Holdings vs fair value | — | — |
| Holdings above 200-day average | — | — |
| Net flow, latest 3 reported months | +$225M thru Jul 2026 | −$179M thru May 2026 |
| 30-day implied volatility | 26.4% | 8.3% |
| Holdings as of | as of Oct 19, 2026issuer data | as of Oct 19, 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
49% of JMBS · 2% of MBB| Holding | JMBS | MBB |
|---|---|---|
| GNMA II TBA 30yr 5.5% November Delivery, 5.50%, 11/19/26, due Nov 19, 2026 | 2.55% | 0.53% |
| GNMA II TBA 30yr 5% November Delivery, 5.00%, 11/19/26, due Nov 19, 2026 | 2.99% | 0.28% |
| UMBS TBA 30yr 2% November Delivery, 2.00%, 11/12/26, due Nov 12, 2026 | 4.37% | 0.22% |
| GNMA II TBA 30yr 4.5% November Delivery, 4.50%, 11/19/26, due Nov 19, 2026 | 1.66% | 0.22% |
| UMBS TBA 30yr 2.5% November Delivery, 2.50%, 11/12/26, due Nov 12, 2026 | 17.64% | 0.16% |
| UMBS TBA 30yr 6.5% November Delivery, 6.50%, 11/12/26, due Nov 12, 2026 | 4.76% | 0.13% |
| UMBS TBA 30yr 3% November Delivery, 3.00%, 11/12/26, due Nov 12, 2026 | 4.62% | 0.12% |
| UMBS TBA 30yr 6% November Delivery, 6.00%, 11/12/26, due Nov 12, 2026 | 0.11% | 0.16% |
| GNMA II TBA 30yr 4% November Delivery, 4.00%, 11/19/26, due Nov 19, 2026 | 1.44% | 0.06% |
| UMBS TBA 30yr 3.5% November Delivery, 3.50%, 11/12/26, due Nov 12, 2026 | 2.46% | 0.05% |
| UMBS TBA 30yr 4% November Delivery, 4.00%, 11/12/26, due Nov 12, 2026 | 4.72% | 0.04% |
| GNMA II TBA 30yr 3.5% November Delivery, 3.50%, 11/19/26, due Nov 19, 2026 | 1.79% | 0.03% |
| FNMA 30yr Pool#AS7492 4.000% 01-Jul-2046, 4.00%, 07/01/46, due Jul 1, 2046 | 0.00% | 0.00% |
Sector mix of the stock holdings
No sector breakdown: these funds hold few classified stocks.
More: full overlap table · JMBS 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.