Research International Core Portfolio
NORTHWESTERN MUTUAL SERIES FUND INC
Expense ratio
Net assets1
$980.29M
Holdings1
112
Category
International Equity
Return

Investment objective & strategy

As of May 2, 2025 · prospectus

Objective. The investment objective of the Portfolio is to seek capital appreciation.

Strategy. The Portfolio normally invests primarily in foreign equity securities, including emerging market equity securities. The Portfolio normally invests its assets across different industries, sectors, countries, and regions, but the Portfolio may invest a significant percentage of its assets in issuers in a single industry, sector, country, or a particular geographic region. In conjunction with a team of investment research analysts, sector leaders select investments for the Portfolio. The adviser generally manages the Portfolio to align with the MSCI EAFE (Europe-Australasia-Far East) Index (the Index) with respect to sector weightings. The Portfolio does not, as a matter of policy, concentrate in any particular industry. The Portfolio is not constrained by any particular investment style. The adviser may invest the Portfolios assets … The Portfolio normally invests primarily in foreign equity securities, including emerging market equity securities. The Portfolio normally invests its assets across different industries, sectors, countries, and regions, but the Portfolio may invest a significant percentage of its assets in issuers in a single industry, sector, country, or a particular geographic region. In conjunction with a team of investment research analysts, sector leaders select investments for the Portfolio. The adviser generally manages the Portfolio to align with the MSCI EAFE (Europe-Australasia-Far East) Index (the Index) with respect to sector weightings. The Portfolio does not, as a matter of policy, concentrate in any particular industry. The Portfolio is not constrained by any particular investment style. The adviser may invest the Portfolios assets in the stocks of companies it believes to have above average earnings growth potential compared to other companies (growth companies), in the stocks of companies it believes are undervalued compared to their perceived worth (value companies), or in a combination of growth and value companies. The Portfolios investments in equity securities may include securities of companies of any capitalization level, and could include common stocks, preferred stocks, securities convertible into stock and American Depositary Receipts (ADRs) and other depositary receipts for those securities. The adviser uses an active bottom up investment approach to buying and selling investments for the Portfolio, which emphasizes individual stock selection. Investments are selected primarily based on fundamental analysis of individual issuers and their potential in light of their financial condition, and market, economic, political and regulatory conditions. Factors considered may include analysis of an issuers earnings, cash flows, competitive position and management ability. The adviser may also consider environmental, social and governance (ESG) factors in its fundamental investment analysis where the adviser believes such factors could materially impact the economic value of an issuer. ESG factors considered may include, but are not limited to, climate change, resource depletion, an issuer's governance structure and practices, data protection and privacy issues, and diversity and labor practices. Consideration of ESG factors may not be determinative in the advisers investment process and the adviser may conclude that other attributes of an investment outweigh ESG considerations when making investment decisions for the Portfolio. Quantitative screening tools that systematically evaluate an issuers valuation, price and earnings momentum, earnings quality and other factors, may also be considered. The adviser may sell securities for a variety of reasons such as to seek to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others.

Top holdings

As of March 31, 2026 · N-PORT
SecurityTickerValue% of fund
MIZUHO FINANCIAL $29.07M 2.97%
SCHNEIDER ELECTR $25.29M 2.58%
HITACHI LTD $23.06M 2.35%
Novartis AG (Registered) NVSEF $22.05M 2.25%
TOTALENERGIES SE $20.81M 2.12%
ASML Holding NV $19.10M 1.95%
LINDE PLC $17.89M 1.82%
TSMC $17.37M 1.77%
ASTRAZENECA PLC $15.55M 1.59%
ENI SPA $14.76M 1.51%
View all holdings →

Allocation by sector

As of March 31, 2026 · N-PORT
View portfolio breakdown →

Portfolio moves

Dec 31, 2025 → Mar 31, 2026
Opened
8
Exited
7
Increased
10
Decreased
94
Unchanged
1

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 Research International Portfolio 98% 0.89%
MFS Research International Portfolio 94% 0.64%
MFS Research International Fund · MRSAX, MRSJX, MRIBX, MRICX, MRSIX, MRSGX, MRSRX, MRSHX, MRSKX 93% 0.64%
View all similar funds →

Advisers

As of December 31, 2025 · N-CEN
FirmRole
MASSACHUSETTS FINANCIAL SERVICES COMPANY Sub-adviser
Mason Street Advisors, LLC Adviser

Footnotes

  1. Net assets and holdings count as of March 31, 2026, from the fund's N-PORT filing.

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