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Launched

iShares Mortgage-Backed Securities Active ETF

MBBACboeC

$47.19+0.14 (+0.30%)

At close: Oct 13, 2026, 4:00 PM

C53/ 100

Rank 9 of 25 in Mortgage-Backed Securities

C53/100Rank 9 of 25inMortgage-Backed Securities
Intraday session: up, 63 prints from 47.05 to 47.19. Range 47.04 to 47.25. Use the arrow keys to read each point.47.1047.1547.2510 AM12 PM2 PM4 PM
Expense ratio
0.26%
Fund size
$714M
1Y total return
—
Yield · Last 12 months
Data unavailable
Holdings
670
Avg volume · 30D
0.2M sh
NAV per share
$46.99
52W range
low $46.32high $54.68
Launched

The ETF.net MBBA Grade

Based on 5 of 6 pillars

C

Score 53 out of 100

Category
Mortgage-Backed Securities⁠
Rank
9 of 25
Six-pillar profile for MBBA. Scores out of 100: Cost 67, Risk 23, Mission not scored, Tradability 68, Holdings 25, Durability 78. Strongest: Durability (78). Weakest: Risk (23). Based on 5 of 6 pillars.

Score 53 of 100 falls in the C band. A is 70 or higher, B 55 to under 70, C 40 to under 55, D 25 to under 40, F under 25.

  • Cost

    The fund’s net expense ratio, ranked against its category.
    B67 out of 100
    Rank 8 of 25

  • Mission

    Whether the fund did what it promised, tested against its stated mandate.
    Not scored

  • Risk

    How the fund held up when markets fell: downside volatility, drawdowns and tail loss.
    F23 out of 100
    Rank 24 of 25

  • Tradability

    How easy the fund is to trade: daily volume, and how far its price strays from net asset value.
    B68 out of 100
    Rank 6 of 25

  • Holdings

    How concentrated the fund is, and how complete and current its disclosed holdings are.
    D25 out of 100
    Rank 22 of 25

  • Durability

    Whether the fund is likely to stay open, judged by its age, its assets and its issuer’s assets.
    A78 out of 100
    Rank 5 of 25

Our read on MBBA

ETF.net Research

CActive management aimed at the plumbing of the mortgage market: iShares gives a manager room to pick agency MBS instead of mirroring the Bloomberg U.S. MBS Index, and charges less than the typical fund in this corner to do it.

Stated mandate

The Fund seeks to maximize total return while generating income and applying prudent investment management.

Why people hold it

  1. 01Runs at 0.25% a year, under the 0.35% typical of MBS funds in its group. Active mandates usually charge up from the index, not down toward it.
  2. 02The mandate: maximize total return while generating income. The Bloomberg U.S. MBS Index is the yardstick, not a leash the manager has to hug bond for bond.
  3. 03Spread across roughly 500 US mortgage bonds in a plain 1940 Act open-end fund. No K-1, no derivative wrapper, no offshore structure to decode.
  4. 04Fund inception dates to 1998, meaning this mortgage playbook was running long before most of the ETFs it now sits beside existed.

Worth knowing

  1. 01Cheap for active, still pricier than the index route: MBB, VMBS and SPMB all sit at a few basis points. Here you are paying for a manager's calls.
  2. 02Because it is active, there is no tracking record to audit, and only a short window of risk history exists. Less to measure than a long-running tracker.
  3. 03Smaller and more lightly traded than the index heavyweights in the MBS category, which is where limit orders earn their keep.

MBBA Holdings

As of Oct 12, 2026
Asset class
Bonds
Holdings
670
Top-10 weight
95%
Largest holding
Blk Csh Fnd Treasury Sl Agency47.5%

Geography

  • United States100.00%
The fund’s holdings, weight-ordered — page 1 of 45.
#TickerCompanyWeight %SharesMarket valueIn ETFs
001—Blk Csh Fnd Treasury Sl Agency47.52%340,649,184$341M437
002—Umbs 30YR Tba(Reg A) 5.50% 11/12/2026 (UM30)12.77%95,539,255$92M52
003—Umbs 30YR Tba(Reg A) 6.00% 11/12/2026 (UM30)6.18%44,997,982$44M41
004—Fhlmc 30YR Umbs Super 2.00% 08/01/2052 (FRSL6270)4.99%47,103,954$36M1
005—GNMA2 30YR Tba(Reg C) 2.00% 10/20/2026 (G230J)4.78%44,500,000$34M26
006—Fnma 30YR Umbs 2.50% 09/01/2050 (FNCA6950)4.71%42,141,957$34M6
007—Umbs 15YR Tba(Reg B) 2.00% 11/17/2026 (UM15)4.25%34,286,000$31M24
008—Umbs 30YR Tba(Reg A) 3.50% 11/12/2026 (UM30)3.54%29,875,000$25M34
009—GNMA2 30YR Tba(Reg C) 5.00% 10/20/2026 (G230J)2.95%22,662,000$21M33
010—Fnma 30YR Umbs Super 5.50% 11/01/2054 (FNFA3994)2.87%21,254,426$21M2
011—Fnma 30YR Umbs 6.00% 10/01/2055 (FNCC1249)2.83%20,493,467$20M1
012—GNMA2 30YR Tba(Reg C) 5.50% 10/20/2026 (G230J)2.64%19,667,000$19M38
013—FHSTR_436 Ab 4.00% 05/25/2027 (FHSTR_436-AB)2.62%18,907,718$19M1
014—Umbs 30YR Tba(Reg A) 6.50% 11/12/2026 (UM30)2.40%17,094,000$17M40
015—Umbs 30YR Tba(Reg A) 2.50% 11/12/2026 (UM30)2.31%21,195,000$17M35

Showing 1–15 of 670 holdings

MBBA Performance

Launched May 18, 1998

Shows how $10,000 changes over the selected period, with cash distributions reinvested at the closing price on each ex-dividend date.

Not enough history yet.Not enough history yet.Not enough history yet.Not enough history yet.Not enough history yet.
MBBA$9,637
SPY tracks large US stocks. It provides market context, rather than representing this fund’s strategy, asset class or investment benchmark.$10,332
Jul 10, 2026 to Oct 12, 2026. MBBA $9,637. SPY $10,332. Use the arrow keys to read each point.$9,508$9,958$10,407Jul 2026Aug 2026Oct 2026

Jul 10, 2026 – Oct 12, 2026

Returns run to the Oct 12, 2026 close, with cash distributions reinvested. Each period starts on the same date that many months or years earlier. Periods over one year show the average yearly return.

Trailing total return for MBBA. Periods over one year show the average yearly return.
PeriodMBBA
Year to dateHistory unavailable—
1 month−1.9%
3 months−3.6%
1 yearHistory unavailable—
3 yearsHistory unavailableper year—
5 yearsHistory unavailableper year—
10 yearsHistory unavailableper year—

As of the close, with distributions reinvested.

Calendar-year total return with cash distributions hypothetically reinvested at the ex-dividend date’s closing price. The current year shows year to date.

Annual total returns for MBBA
YearReturn barMBBA
2026 YTD−3.1%

History from Jan 27, 2026

MBBA in the news

Filtered to MBBA · Mortgage-Backed Securities

MBBA Dividends

Last payment
$0.07 per share
Paid on
Shares bought on or after this date do not qualify for this distribution.
Frequency
Monthly

Distribution data unavailable.

Distribution history

2026

One bar per payment. 8 payments in 2026 YTD. Mar 2, 2026 $0.31; Apr 1, 2026 $0.20; May 1, 2026 $0.20; Jun 1, 2026 $0.20; Jul 1, 2026 $0.18; Aug 3, 2026 $0.19; Sep 1, 2026 $0.19; Oct 1, 2026 $0.07. Use the arrow keys to read each point.2026YTD
Ex-datePay dateAmount per share
Oct 1, 2026Oct 6, 2026$0.07
Sep 1, 2026Sep 4, 2026$0.19
Aug 3, 2026Aug 6, 2026$0.19
Jul 1, 2026Jul 7, 2026$0.18
Jun 1, 2026Jun 4, 2026$0.20
May 1, 2026May 6, 2026$0.20
Apr 1, 2026Apr 7, 2026$0.20
Mar 2, 2026Mar 5, 2026$0.31

MBBA Risk

How much the fund’s monthly returns vary, scaled to a year.
—
No data available
How it’s calculated: standard deviation

The sample standard deviation of monthly total returns, multiplied by the square root of 12.

Uses up to 36 complete months, with at least 12 required. Total returns include reinvested distributions.

Return above 3-month US Treasury bills per unit of volatility.
—
No data available
How it’s calculated: Sharpe ratio

Subtract each month’s Treasury-bill return from the fund’s monthly total return.

Divide the average of those excess returns by their sample standard deviation, then multiply by the square root of 12.

Uses up to 36 complete months, with at least 12 required. Each month uses the Treasury yield quoted at the end of the previous month.

The largest fall from a peak to the low that followed.
—
No data available
How it’s calculated: maximum drawdown

The largest percentage decline from an earlier peak, using total returns with reinvested distributions.

Uses up to five years through the last close, with at least 12 months required.

How strongly the fund’s returns move with its asset-class index.
1.10
vs its asset-class index
How it’s calculated: beta

The beta figure is supplied by FMP. The comparison index depends on the fund’s broad asset class.

MBBA Cost

Expense ratio0.26%
  • The middle half of Mortgage-Backed Securities funds
  • Median 0.36%

9 of the 24 Mortgage-Backed Securities funds charge less.

MBBA costs $26.00 a year on $10,000. The median Mortgage-Backed Securities fund costs $36.00.

Other funds in Mortgage-Backed Securities

See others