MFRKX — MFS Research Fund
Data updated: 2026-05-26
MFRKX — MFS Research Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. United States Large Cap Blend / Core Equity · $7.33B AUM · 0.44% expense ratio · 13.4% 1-yr return. From SEC regulatory filings.
MFRKX Fund Overview
MFRKX — MFS Research Fund is a US mutual fund managed by Mfs Series Trust V, categorised as United States Large Cap Blend / Core Equity. 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 V
- Category: United States Large Cap Blend / Core Equity
- Assets under management: $7.33B
- 1-year return: 13.4%
- Ticker: MFRKX
- SEC CIK: 0000200489
- SEC series ID: S000002438
- Share class ID: C000034431
MFRKX Holdings
Top 10 holdings of MFS Research Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| NVIDIA Corp. | 8.34% |
| Apple, Inc. | 6.84% |
| Microsoft Corp. | 5.88% |
| Alphabet, Inc. | 4.62% |
| Amazon.com, Inc. | 4.50% |
| Broadcom, Inc. | 3.08% |
| Meta Platforms, Inc. | 2.83% |
| Mastercard, Inc. | 2.52% |
| JPMorgan Chase & Co. | 2.49% |
| Exxon Mobil Corp. | 1.93% |
MFRKX Portfolio Allocation
Asset-class allocation of MFS Research Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 99.3% |
| Cash & Equivalents | 0.7% |
MFRKX Performance
Total returns for MFRKX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | -4.8% |
| 1 year | 13.4% |
| 3 years (annualised) | 14.7% |
| 5 years (annualised) | 9.2% |
MFRKX Risk Information
Risk metrics for MFRKX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 10.2%
MFRKX Costs and Fees
MFRKX costs about $44 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.44%
- Gross expense ratio: 0.45%
- Portfolio turnover: 41%
- Brokerage commissions: 0.81 bps of average net assets (SEC N-CEN)
MFRKX Cashflows
Over the 12 months to 2026-03, MFS Research Fund had net outflows of $13.38M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | −$91.96M |
| 2026-02 | −$171.20M |
| 2026-01 | −$54.69M |
| 2025-12 | $965.95M |
| 2025-11 | −$95.42M |
| 2025-10 | −$73.58M |
MFRKX Debt Constituents
No individual debt constituents are reported in MFS Research Fund's latest SEC N-PORT filing.
MFRKX Prospectus and SEC Filings
Official MFS Research Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other United States Large Cap Blend / Core Equity 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.