MNDJX
MFS New Discovery Fund
MFS SERIES TRUST I
Expense ratio1
0.96%
Net assets2
$2.09B
Holdings2
108
Category
US Equity
2025 return3
12.66%

Investment objective & strategy

As of Dec. 29, 2025 · prospectus

Objective. The funds investment objective is to seek capital appreciation.

Strategy. MFS (Massachusetts Financial Services Company, the funds investment adviser) normally invests the funds assets primarily in equity securities. Equity securities include common stocks, depositary receipts, and other securities that represent an ownership interest (or right to acquire an ownership interest) in a company or other issuer. MFS focuses on investing the funds assets in the stocks of companies it believes to have above average earnings growth potential compared to other companies (growth companies). While MFS may invest the funds assets in securities of companies of any size, MFS primarily invests in securities of companies with small capitalizations. MFS may invest the funds assets in foreign securities. MFS normally invests the fund's assets across different industries and sectors, but MFS may … MFS (Massachusetts Financial Services Company, the funds investment adviser) normally invests the funds assets primarily in equity securities. Equity securities include common stocks, depositary receipts, and other securities that represent an ownership interest (or right to acquire an ownership interest) in a company or other issuer. MFS focuses on investing the funds assets in the stocks of companies it believes to have above average earnings growth potential compared to other companies (growth companies). While MFS may invest the funds assets in securities of companies of any size, MFS primarily invests in securities of companies with small capitalizations. MFS may invest the funds assets in foreign securities. MFS normally invests the fund's assets across different industries and sectors, but MFS may invest a significant percentage of the fund's assets in issuers in a single industry or sector. MFS uses an active bottom-up investment approach to buying and selling investments for the fund. Investments are selected primarily based on fundamental analysis of individual issuers. Quantitative screening tools that systematically evaluate issuers may also be considered.

Top holdings

As of Feb. 28, 2026 · N-PORT
SecurityTickerValue% of fund
MFS Institutional Money Market Portfolio, Class A $103.19M 4.93%
ADV ENERGY INDS $60.83M 2.90%
LIGAND PHARMACEUTICALS $47.72M 2.28%
QXO INC $46.70M 2.23%
MODINE MFG CO $40.32M 1.93%
NVENT ELECTRIC PLC $39.21M 1.87%
MACOM TECHNOLOGY SOLUTIONS HOLDINGS INC $38.80M 1.85%
BIO-TECHNE CORP $38.04M 1.82%
LITTELFUSE INC $34.02M 1.62%
FLOWSERVE CORP $32.27M 1.54%
View all holdings →

Allocation by sector

As of February 28, 2026 · N-PORT
View portfolio breakdown →

Portfolio moves

Nov 30, 2025 → Feb 28, 2026
Opened
9
Exited
17
Increased
32
Decreased
37
Unchanged
31

How many positions this fund opened, exited, grew, trimmed, or left unchanged between its two most recent N-PORT snapshots — net changes between point-in-time reports, not a trade log.

View portfolio moves →

Similar funds

Funds whose portfolios most overlap this one, by weight
FundOverlapNet exp.
MFS New Discovery Series 90% 0.87%
MFS Blended Research Small Cap Equity Portfolio 25% 0.57%
MFS Blended Research Small Cap Equity Fund · BRSDX, BRSBX, BRSHX, BRSJX, BRSPX, BRSSX, BRSTX, BRSUX, BRSYX 25% 0.66%
View all similar funds →

Advisers

As of August 31, 2025 · N-CEN
FirmRole
MASSACHUSETTS FINANCIAL SERVICES COMPANY Adviser

Footnotes

  1. Expense ratio as of December 29, 2025, from the fund's prospectus.
  2. Net assets and holdings count as of February 28, 2026, from the fund's N-PORT filing.
  3. Total return for calendar year 2025, before tax and after fund expenses. Computed by compounding the twelve monthly total returns the fund reported in its SEC N-PORT filings for 2025 (the latest prospectus does not yet chart this year).

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