American Funds Mortgage Fund
Actively managed U.S. bond fund
As of its 2026 Q2 report, American Funds Mortgage Fund held 1,289 positions with $13.08B in net assets. Its ten largest holdings made up 23.1% of the fund. The MFAAX share class costs 0.68% a year. Over the 12 months to May 2026, MFAAX returned 5.1%, with dividends reinvested. In 2026 Q2 it added 116 new positions and exited 90.
The funds investment objective is to provide current income and preservation of capital.
The fund invests at least 80% of assets in mortgage-related securities, primarily those sponsored or guaranteed by U.S. government entities or rated Aaa/AAA, with a portfolio divided among multiple managers who select securities they view as attractively priced long-term opportunities. The fund may also hold federal agency debt and use derivatives including futures and swaps. Because security selection depends on the investment adviser's judgment of relative value, fund holdings and performance will diverge from any mortgage market benchmark.
What you own
| Company | Weight | Value | Shares |
|---|---|---|---|
CMQXXCAPITAL GROUP CENTRAL CASH FUND | 6.53% | $854.51M | — |
UNIFORM MBS 2.50% · due 2056-07-01 | 3.33% | $435.19M | — |
FEDERAL HOME LOAN BANKS 0.00% · due 2026-08-06 | 1.90% | $248.34M | — |
FEDERAL HOME LOAN BANKS 0.00% · due 2026-12-31 | 1.87% | $244.59M | — |
FEDERAL HOME LOAN BANKS 0.00% · due 2026-07-29 | 1.71% | $223.69M | — |
UNITED STATES TREASURY 4.75% · due 2056-02-15 | 1.62% | $211.51M | — |
FEDERAL HOME LOAN MORTGAGE CORP 6.00% · due 2055-05-01 | 1.61% | $210.38M | — |
FEDERAL HOME LOAN BANKS 0.00% · due 2026-07-31 | 1.52% | $198.79M | — |
FEDERAL HOME LOAN BANKS 0.00% · due 2026-09-04 | 1.51% | $198.09M | — |
FEDERAL HOME LOAN BANKS 0.00% · due 2026-09-16 | 1.51% | $197.84M | — |
The 200 largest of 1,289 holdings, with the share counts as filed, open with a free account.
What the fund is made of
Percentages are of fund net assets. Rounding, liabilities and short positions can make totals differ from 100%.
| Securitized | 70.70% |
| Bonds | 35.80% |
| Cash & short-term | 6.53% |
| Derivatives | 0.37% |
These positions come to 113.41% of the fund's net assets. This counts only what the fund reported holding — the holdings disclosure covers assets, not liabilities such as borrowings — so it is not expected to reconcile to 100%.
Derivatives are shown at market value, not notional exposure.
How it has done
MFAAX share class · total returns with dividends reinvested
Volatility over the last 12 months: 3.48%. Past returns are a record, not a forecast.
The 21 share classes hold the same portfolio
| Share class | Expense ratio | 1 year | 3 years | 5 years | Worst fall |
|---|---|---|---|---|---|
| 0.68% | +5.05% | +10.59% | +1.53% | -6.56% | |
| 0.68% | +5.32% | +11.50% | +2.84% | -6.46% | |
| 1.38% | +4.32% | +8.41% | -1.94% | -6.71% | |
| 1.35% | +4.46% | +8.49% | -1.74% | -6.81% | |
| 0.92% | +4.92% | +10.07% | +0.46% | -6.57% | |
| 0.62% | +5.22% | +10.93% | +1.97% | -6.53% | |
| 0.32% | +5.53% | +11.92% | +3.48% | -6.42% | |
| 0.26% | +5.60% | +12.14% | +3.81% | -6.39% | |
| 1.43% | +4.39% | +8.23% | -2.06% | -6.84% | |
| 0.62% | +5.21% | +10.92% | +1.91% | -6.54% | |
| 0.37% | +5.48% | +11.77% | +3.22% | -6.32% | |
| 0.69% | +5.16% | +10.65% | +1.51% | -6.47% | |
| 1.48% | +4.36% | +8.08% | -2.27% | -6.88% | |
| 0.92% | +4.92% | +10.00% | +0.47% | -6.65% | |
| 1.08% | +4.87% | +9.74% | +0.00% | -6.62% | |
| 0.42% | +5.44% | +11.72% | +3.08% | -6.35% | |
| 0.26% | +5.60% | +12.15% | +3.82% | -6.40% | |
| 0.72% | +5.38% | +11.37% | +2.66% | -6.39% | |
| 0.68% | +5.45% | +11.58% | +3.00% | -6.36% | |
| 0.41% | +5.45% | +11.62% | +3.06% | -6.46% | |
| 0.31% | +5.57% | +12.03% | +3.58% | -6.30% |
These classes hold the same portfolio, so the 6.10pp spread over 5 years is the cost difference between them — roughly 1.22pp a year — not a difference in what they own.
Fees & fund details
American Funds Mortgage Fund is an actively managed U.S. bond fund.
- Asset class
- Bonds
- Region
- United States
- Management
- Actively managed
- Fund type
- Open-end fund
- Credit quality
- High yield
- Rate sensitivity
- Intermediate duration
- Expense ratio, by class
- 0.26% – 1.48%· MFAAX 0.68%
- Portfolio turnover
- 428.00% a year · as of 2025 Q4
Net is what a holder pays after the adviser's contractual waiver; gross is before it. A waiver can expire.
Turnover is how much of the portfolio was replaced in a year.
Classified from what the fund holds, not from its name · 2026 Q2. The summary is a paraphrase of the prospectus; the objective is verbatim.
What changed this quarter
Positions that entered or left the fund since its previous filing. Positions that were only resized are not listed.
116 new· the largest 3
90 exited· the largest 2
Debt profile
What this fund holds — value-weighted across its bond and securitized long positions · as of 2026-05-31
Share of the fund's debt by how its coupon behaves — the fact that decides whether a rate move reaches this portfolio at all.
| Fixed rate | 98.6% |
| Floating rate | 1.4% |
Share of the fund's debt value in each maturity band, shortest first.
| <1y | 25.4% |
| 1-3y | 2.4% |
| 3-5y | 2.3% |
| 5-10y | 2.3% |
| 10y+ | 67.7% |
Based on what filers reported; a filer that never reported a flag also reads as none.
Risk profile
Interest-rate and credit-spread sensitivity, both in years · as of 2026Q2
Most of this fund’s sensitivity is to interest rates, with credit spreads carrying a small fraction as much.
Where the loss would come from. The two shocks are the same size, so this is the balance of the fund's two sensitivities rather than a bet on one moving more.
| Interest rates | 98% |
| Credit spreads | 2% |
Filers report the impact of a 0.01% move only, so the total is our own scaling of that one number and overstates the loss on most bonds — read it as approximate, never as precise. The two sensitivities overlap rather than add up: they measure the same positions against different shocks, which is why the durations above are shown side by side and never summed.
Share of the fund's spread duration carried by each credit tier.
| High yield | +0.09 yr |
| Investment grade | +0.03 yr |
Share of duration at each point, shortest first. A positive figure loses value when spreads widen; a negative one offsets — a credit hedge.
| 1 yr | 1.37 yr | 20% |
| 5 yr | 1.98 yr | 29% |
| 10 yr | 2.28 yr | 34% |
| 30 yr | 1.15 yr | 17% |
3 mo is NEGATIVE (-0.05 yr) — a deliberate hedge at that point on the curve, so it is not part of the band above.
| 3 mo | 0.05 yr | 42% |
| 1 yr | 0.04 yr | 29% |
| 5 yr | 0.03 yr | 24% |
| 10 yr | 0.00 yr | 3% |
| 30 yr | 0.00 yr | 1% |
The two bands measure the same positions against different shocks and do not add — a Treasury carries rate duration and no spread duration, a floating-rate credit the reverse. Rate tenors are also summed across every currency the fund discloses.
Show the numbers
| Tenor | Rate yrs | IG yrs | HY yrs | IG $/bp | HY $/bp |
|---|---|---|---|---|---|
| 3 mo | -0.05 | +0.00 | +0.05 | $1.7k | $68.8k |
| 1 yr | +1.37 | +0.02 | +0.02 | $25.0k | $23.7k |
| 5 yr | +1.98 | +0.01 | +0.02 | $13.9k | $25.8k |
| 10 yr | +2.28 | +0.00 | +0.00 | $1.4k | $4.4k |
| 30 yr | +1.15 | +0.00 | +0.00 | $225 | $863 |
Dollar change per 1bp of spread movement, as filed and sign-anchored. A blank cell was not filed; a zero was.
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