MIOCX — MFS Strategic Income Fund
Data updated: 2026-06-29
MIOCX — MFS Strategic Income Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Total / Aggregate Bond · $8.20B AUM · 1.48% expense ratio · 4.2% 1-yr return. From SEC regulatory filings.
MIOCX Fund Overview
MIOCX — MFS Strategic Income Fund is a US mutual fund managed by Mfs Series Trust VIII, categorised as Long Total / Aggregate Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Mfs Series Trust VIII
- Category: Long Total / Aggregate Bond
- Assets under management: $8.20B
- 1-year return: 4.2%
- Ticker: MIOCX
- SEC CIK: 0000819673
- SEC series ID: S000002491
- Share class ID: C000006709
MIOCX Holdings
Top 10 holdings of MFS Strategic Income Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| United States of America | 2.93% |
| United States of America | 2.37% |
| United States of America | 2.19% |
| United States of America | 1.98% |
| United States of America | 1.86% |
| MFS Institutional Money Market Portfolio | 1.83% |
| United States of America | 1.82% |
| United States of America | 1.74% |
| United States of America | 1.74% |
| United States of America | 1.71% |
MIOCX Portfolio Allocation
Asset-class allocation of MFS Strategic Income Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 70.0% |
| Securitized | 27.8% |
| Cash & Equivalents | 1.8% |
MIOCX Performance
Total returns for MIOCX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.1% |
| 1 year | 4.2% |
| 3 years (annualised) | 3.7% |
| 5 years (annualised) | 0.1% |
MIOCX Risk Information
Risk metrics for MIOCX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.4%
MIOCX Costs and Fees
MIOCX costs about $148 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.48%
- Gross expense ratio: 1.55%
- Portfolio turnover: 26%
- Brokerage commissions: 0.40 bps of average net assets (SEC N-CEN)
MIOCX Cashflows
Over the 12 months to 2026-04, MFS Strategic Income Fund had net inflows of $1.67B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-04 | $111.86M |
| 2026-03 | $45.67M |
| 2026-02 | $160.38M |
| 2026-01 | $132.88M |
| 2025-12 | $163.64M |
| 2025-11 | $182.58M |
MIOCX Debt Constituents
Largest debt holdings of MFS Strategic Income Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States of America | 2.93% |
| United States of America | 2.37% |
| United States of America | 2.19% |
| United States of America | 1.98% |
| United States of America | 1.86% |
| United States of America | 1.82% |
| United States of America | 1.74% |
| United States of America | 1.74% |
| United States of America | 1.71% |
| United States of America | 1.61% |
MIOCX Prospectus and SEC Filings
Official MFS Strategic Income Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Long Total / Aggregate Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.