MFS Emerging Markets Debt Fund
Actively managed global bond fund
As of its 2026 Q2 report, MFS Emerging Markets Debt Fund held 492 positions with $7.55B in net assets. Its ten largest holdings made up 11.7% of the fund. The MEDAX share class costs 1.07% a year. Over the 12 months to May 2026, MEDAX returned 12.1%, with dividends reinvested. In 2026 Q3 it added 86 new positions and exited 116.
The funds investment objective is to seek total return with an emphasis on high current income, but also considering capital appreciation.
The fund invests at least 80% of assets in debt instruments issued by or economically tied to emerging market countries, selecting securities based on fundamental analysis of creditworthiness, relative value, duration, yield positioning, and liquidity across different countries, sectors, and industries. The fund may concentrate a significant portion of assets in a single country, sector, or industry, and may hold up to 100% in below-investment-grade debt, creating concentration risk. The fund may use derivatives to adjust market, interest rate, or currency exposure.
What you own
| Company | Weight | Value | Shares | Reported price |
|---|---|---|---|---|
MFS Institutional Money Market Portfolio | 4.15% | $313.65M | 313.6M | $1.00 |
Argentina Republic Government International Bonds 4.13% floating · due 2035-07-09 | 1.14% | $86.11M | — | — |
Argentina Republic Government International Bonds 3.50% floating · due 2041-07-09 | 1.02% | $76.99M | — | — |
Ecuador Government International Bonds 6.90% · due 2035-07-31 | 0.98% | $73.87M | — | — |
Argentina Republic Government International Bonds 5.00% · due 2038-01-09 | 0.90% | $68.27M | — | — |
Paraguay Government International Bonds 5.40% · due 2050-03-30 | 0.73% | $55.47M | — | — |
Colombia Government International Bonds 7.75% · due 2036-11-07 | 0.71% | $53.81M | — | — |
DOMINICAN REPUBLIC 4.88% · due 2032-09-23 | 0.71% | $53.42M | — | — |
REPUBLIC OF VENEZUELA 0.00% · due 2027-09-15 | 0.67% | $50.92M | — | — |
Ecuador Government International Bonds 5.00% floating · due 2040-07-31 | 0.64% | $48.47M | — | — |
Reported price is the fund's own reported value divided by its own reported shares at 2026-04-30 — not a live quote, and not what the fund paid.
The 200 largest of 492 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%.
| Bonds | 95.22% |
| Stocks | 4.15% |
| Derivatives | 0.01% |
| Other | 0.00% |
Derivatives are shown at market value, not notional exposure.
How it has done
MEDAX share class · total returns with dividends reinvested
Volatility over the last 12 months: 5.21%. Past returns are a record, not a forecast.
Jun 2026 and Jul 2026 have been filed since the trailing figures were struck, so they are not in the table above or the curve — every figure here shares one cut-off, which is what makes them comparable with other funds.
The 9 share classes hold the same portfolio
| Share class | Expense ratio | 1 year | 3 years | 5 years | Worst fall |
|---|---|---|---|---|---|
| 1.07% | +12.09% | +33.29% | +13.43% | -5.58% | |
| 1.82% | +11.33% | +30.42% | +9.35% | -5.72% | |
| 1.82% | +11.33% | +30.33% | +9.32% | -5.81% | |
| 0.82% | +12.37% | +34.21% | +14.87% | -5.62% | |
| 0.71% | +12.58% | +34.77% | +15.52% | -5.58% | |
| 1.82% | +11.33% | +30.43% | +9.35% | -5.81% | |
| 1.32% | +11.86% | +32.26% | +12.01% | -5.68% | |
| 1.07% | +12.16% | +33.27% | +13.45% | -5.65% | |
| 0.82% | +12.44% | +34.26% | +14.94% | -5.50% |
These classes hold the same portfolio, so the 6.20pp spread over 5 years is the cost difference between them — roughly 1.24pp a year — not a difference in what they own.
Fees & fund details
MFS Emerging Markets Debt Fund is an actively managed global bond fund.
- Asset class
- Bonds
- Region
- Global
- Management
- Actively managed
- Fund type
- Open-end fund
- Credit quality
- Mixed credit
- Rate sensitivity
- Intermediate duration
- Expense ratio, by class
- 0.71% – 1.82%· MEDAX 1.07%
- Portfolio turnover
- 69.00% 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.
86 new· the largest 6
116 exited· the largest 8
Debt profile
What this fund holds — value-weighted across its bond and securitized long positions · as of 2026-04-30
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 | 90.8% |
| Floating rate | 5.7% |
| Zero-coupon or unclassified | 3.5% |
Share of the fund's debt value in each maturity band, shortest first.
| <1y | 1.9% |
| 1-3y | 5.0% |
| 3-5y | 18.3% |
| 5-10y | 40.4% |
| 10y+ | 34.4% |
These three overlap — one holding can be in arrears and paying in kind at once — so they are shown separately and never summed.
Risk profile
Interest-rate and credit-spread sensitivity, both in years · as of 2026Q2
More of this fund’s sensitivity sits in credit spreads than in interest rates — a rate rally that comes with a credit selloff works against it.
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.
| Credit spreads | 50% |
| Interest rates | 50% |
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.
| Investment grade | +3.11 yr |
| High yield | +2.70 yr |
Share of duration at each point, shortest first. A positive figure loses value when spreads widen; a negative one offsets — a credit hedge.
| 3 mo | 0.02 yr | 0% |
| 1 yr | 0.45 yr | 8% |
| 5 yr | 1.97 yr | 35% |
| 10 yr | 2.42 yr | 42% |
| 30 yr | 0.86 yr | 15% |
| 3 mo | 0.02 yr | 0% |
| 1 yr | 0.42 yr | 7% |
| 5 yr | 1.94 yr | 33% |
| 10 yr | 2.55 yr | 44% |
| 30 yr | 0.88 yr | 15% |
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 | +0.02 | +0.01 | +0.01 | $4.8k | $6.8k |
| 1 yr | +0.45 | +0.19 | +0.23 | $141.2k | $176.7k |
| 5 yr | +1.97 | +0.94 | +1.00 | $708.3k | $758.6k |
| 10 yr | +2.42 | +1.42 | +1.13 | $1.07m | $852.2k |
| 30 yr | +0.86 | +0.56 | +0.32 | $423.5k | $241.9k |
Dollar change per 1bp of spread movement, as filed and sign-anchored. A blank cell was not filed; a zero was.
Duration contribution in years, summing to the fund's 5.72 yr.
This is where the fund's rate exposure sits, not its currency risk — most international bond funds hedge the currency back to dollars, and the size of those hedges is not in the filing. Tenors are also summed across curves, so a 5-year JPY point and a 5-year USD point are added together.
A newer credit-spread reading (2026Q3) is on file. This page holds one quarter across every figure on it, so that one appears here next quarter.
Understand how this fund fits with the rest.
Explore shared holdings, compare funds and follow their businesses with your connected AI:
- “Where do my funds overlap — MEDAX, QQQ and the fund in my 401(k)?”
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