MFS Research Fund
Actively managed U.S. stock fund
As of its 2026 Q2 report, MFS Research Fund held 99 positions with $7.88B in net assets. Its ten largest holdings made up 42.0% of the fund. The MFRFX share class costs 0.75% a year. Over the 12 months to May 2026, MFRFX returned 20.3%, with dividends reinvested. In 2026 Q2 it added 19 new positions and exited 22.
The funds investment objective is to seek capital appreciation.
The fund invests primarily in large-capitalization equity securities selected through fundamental analysis of individual companies, with no constraint to a particular investment style; the manager may hold growth stocks, value stocks, or a blend, and may invest in foreign securities. The fund is managed to be sector neutral to the Standard & Poor's 500 Stock Index using the adviser's custom sector classifications. Because the fund's sector positioning is tied to the S&P 500, performance will diverge from the index to the extent the fund's individual security selections differ from index constituents.
What you own
| Company | Weight | Value | Shares | Reported price |
|---|---|---|---|---|
NVDANVIDIA Corp. | 8.38% | $660.24M | 3.3M | $200.09 |
AAPLApple, Inc. | 6.89% | $543.10M | 1.9M | $289.36 |
GOOGLAlphabet, Inc. | 5.02% | $395.24M | 1.1M | $357.37 |
MSFTMicrosoft Corp. | 4.83% | $380.13M | 1.0M | $373.02 |
AMZNAmazon.com, Inc. | 4.41% | $347.71M | 1.5M | $238.34 |
AVGOBroadcom, Inc. | 3.51% | $276.51M | 732.0K | $377.75 |
2.32% | $182.85M | 558.6K | $327.33 | |
KLACKLA Corp. | 2.27% | $178.55M | 591.8K | $301.71 |
2.27% | $178.42M | 347.4K | $513.60 | |
2.15% | $169.58M | 301.1K | $563.29 |
Reported price is the fund's own reported value divided by its own reported shares at 2026-06-30 — not a live quote, and not what the fund paid.
All 99 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%.
| Stocks | 99.23% |
| Cash & short-term | 1.08% |
Derivatives are shown at market value, not notional exposure.
By sector
- Information Technology
- 37.0%
- Industrials
- 11.3%
- Financials
- 11.1%
- Communication Services
- 8.2%
- 9 other sectors
- 32.5%
- Information Technology
- 37.0%
- Industrials
- 11.3%
- Financials
- 11.1%
- Communication Services
- 8.2%
- Consumer Discretionary
- 7.8%
- Health Care
- 7.3%
- International
- 6.7%
- Consumer Staples
- 3.1%
- Energy
- 3.0%
- Utilities
- 2.0%
- Materials
- 1.2%
- Cash
- 1.1%
- Real Estate
- 0.4%
How it has done
MFRFX share class · total returns with dividends reinvested
Volatility over the last 12 months: 11.57%. Past returns are a record, not a forecast.
Jun 2026 has been filed since the trailing figures were struck, so it is 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 |
|---|---|---|---|---|---|
| 0.75% | +20.26% | +64.10% | +60.78% | -9.23% | |
| 0.50% | +20.56% | +65.33% | +62.82% | -9.19% | |
| 1.50% | +19.37% | +60.48% | +54.88% | -9.40% | |
| 1.50% | +19.36% | +60.50% | +54.89% | -9.39% | |
| 0.50% | +20.56% | +65.30% | +62.80% | -9.17% | |
| 1.50% | +19.40% | +60.46% | +54.89% | -9.41% | |
| 1.00% | +19.99% | +62.91% | +58.83% | -9.32% | |
| 0.75% | +20.26% | +64.13% | +60.80% | -9.24% | |
| 0.44% | +20.61% | +65.59% | +63.25% | -9.17% |
These classes hold the same portfolio, so the 8.37pp spread over 5 years is the cost difference between them — roughly 1.67pp a year — not a difference in what they own.
Fees & fund details
MFS Research Fund is an actively managed U.S. equity fund. 24% of MFRFX’s stock holdings are in companies whose revenue grew in the top quartile of U.S. companies over the last five fiscal years (covering 89% of the fund’s equity).
- Asset class
- Equity
- Region
- United States
- Management
- Actively managed
- Fund type
- Open-end fund
- Expense ratio, by class
- 0.44% – 1.50%· MFRFX 0.75%
- Portfolio turnover
- 41.00% a year · as of 2026 Q1
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.
19 new· the largest 8
22 exited· the largest 8
Understand how this fund fits with the rest.
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