# EDGAR Filing Document

**Accession Number:** 0000742212
**File Stem:** 0001410368-26-053251
**Filing Date:** 2026-5
**Character Count:** 59186
**Document Hash:** f50c3ac149ab2642911c615f05e9c2c6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-053251.hdr.sgml**: 20260527

**ACCESSION NUMBER**: 0001410368-26-053251

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260331

**FILED AS OF DATE**: 20260527

**DATE AS OF CHANGE**: 20260527

**PERIOD START**: 20261231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NORTHWESTERN MUTUAL SERIES FUND INC
- **CENTRAL INDEX KEY:** 0000742212

**ORGANIZATION NAME:**
- **EIN:** 391603401
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-03990
- **FILM NUMBER:** 261024818

**BUSINESS ADDRESS:**
- **STREET 1:** 720 E WISCONSIN AVE
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53202
- **BUSINESS PHONE:** 4142992508

**MAIL ADDRESS:**
- **STREET 1:** 720 EAST WISCONSIN AVE
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53202

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NORTHWESTERN MUTUAL VARIABLE LIFE SERIES FUND INC
- **DATE OF NAME CHANGE:** 19940830

## Series and Classes Contracts Data

### Research International Core Portfolio (Series ID: S000018230)

| Class ID   | Class Name                            | Ticker Symbol   |
|:---|:---|:---|
| C000050278 | Research International Core Portfolio |  |

## Nport-Ex

Research International Core Portfolio

SCHEDULE OF INVESTMENTS

**March 31, 2026 (unaudited)** 

---

| | | | |
|:---|:---|:---|:---|
| Common Stocks (97.7%) | Country | Shares/ Par <sup>+</sup> | Value<br> $(000's) |
|  **Communication Services (4.0%)** | **Communication Services (4.0%)** |  |  |
|  Advanced Info Service PCL - Foreign Shares | Thailand | 397800 | 4553 |
|  Capcom Co., Ltd. | Japan | 94700 | 2008 |
|  Cellnex Telecom SA | Spain | 189504 | 6153 |
|  KDDI Corp. | Japan | 570400 | 9768 |
|  Koninklijke KPN NV | Netherlands | 1422987 | 7915 |
|  SoftBank Group Corp. | Japan | 86300 | 2074 |
|  Spotify Technology SA \* | United States | 13236 | 6418 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **38889** |
|  **Consumer Discretionary (7.2%)** | **Consumer Discretionary (7.2%)** | **Consumer Discretionary (7.2%)** |  |
|  Accor SA | France | 88660 | 4248 |
|  Aristocrat Leisure, Ltd. | Australia | 108521 | 3448 |
|  Burberry Group PLC \* | United Kingdom | 136540 | 1998 |
|  Cie Financiere Richemont SA | Switzerland | 49040 | 8738 |
|  - Class A |  |  |  |
|  Compagnie Generale des | France | 148263 | 5049 |
|  Etablissements Michelin |  |  |  |
|  LVMH Moet Hennessy Louis | France | 18353 | 10202 |
|  Vuitton SE |  |  |  |
|  Next PLC | United Kingdom | 32927 | 5553 |
|  Nitori Holdings Co., Ltd. | Japan | 140400 | 2230 |
|  Pan Pacific International | Japan | 967900 | 5937 |
|  Holdings Corp. |  |  |  |
|  Sands China, Ltd. | Macao | 874000 | 1858 |
|  Shimano, Inc. | Japan | 41600 | 4359 |
|  Sony Group Corp. | Japan | 426700 | 8801 |
|  Suzuki Motor Corp. | Japan | 662600 | 7939 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **70360** |
|  **Consumer Staples (5.4%)** | **Consumer Staples (5.4%)** | **Consumer Staples (5.4%)** |  |
|  Ajinomoto Co., Inc. | Japan | 184600 | 5176 |
|  Alimentation Couche-Tard, Inc. | Canada | 34478 | 1954 |
|  Beiersdorf AG | Germany | 79692 | 7050 |
|  British American Tobacco PLC United Kingdom |  | 241070 | 14042 |
|  Davide Campari-Milano NV | Italy | 880768 | 6273 |
|  Jeronimo Martins SGPS SA | Portugal | 233266 | 5596 |
|  Pernod Ricard SA | France | 95803 | 7151 |
|  Unicharm Corp. | Japan | 985500 | 5739 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **52981** |
|  **Energy (5.3%)** | **Energy (5.3%)** | **Energy (5.3%)** |  |
|  Eni SpA | Italy | 519668 | 14757 |
|  Galp Energia SGPS SA | Portugal | 481589 | 11708 |
|  Reliance Industries, Ltd. | India | 299268 | 4336 |
|  TotalEnergies SE | France | 225407 | 20813 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **51614** |
|  **Financials (25.9%)** | **Financials (25.9%)** | **Financials (25.9%)** |  |
|  AIA Group, Ltd. | Hong Kong | 1238000 | 13907 |
|  Aon PLC | United States | 26736 | 8630 |
|  B3 SA - Brasil, Bolsa, Balcao | Brazil | 2468000 | 8767 |
|  Banco Bilbao Vizcaya | Spain | 531310 | 11597 |
|  Argentina SA |  |  |  |
|  Banco Bradesco SA, ADR | Brazil | 2129555 | 7773 |
|  Bank of Ireland Group PLC | Ireland | 624693 | 11432 |

---

---

| | | | |
|:---|:---|:---|:---|
| Common Stocks (97.7%) | Country | Shares/ Par <sup>+</sup> | Value<br>$(000's) |
|  **Financials continued** |  |  |  |
|  Barclays PLC | United Kingdom | 2564347 | 13513 |
|  Beazley PLC | United Kingdom | 347941 | 5838 |
|  BNP Paribas SA | France | 139435 | 13283 |
|  BPER Banca SpA | Italy | 981374 | 12811 |
|  Euronext NV | Netherlands | 81008 | 13034 |
|  HDFC Bank, Ltd. | India | 886155 | 7046 |
|  Hiscox, Ltd. | United Kingdom | 540525 | 10893 |
|  ING Groep NV | Netherlands | 534030 | 13954 |
|  London Stock Exchange | United Kingdom | 78989 | 9335 |
|  Group PLC |  |  |  |
|  Mastercard, Inc. - Class A | United States | 19613 | 9800 |
|  Mizuho Financial Group, Inc. | Japan | 728400 | 29074 |
|  NatWest Group PLC | United Kingdom | 1235900 | 9170 |
|  Samsung Fire & Marine | South Korea | 11311 | 3279 |
|  Insurance Co., Ltd. |  |  |  |
|  Sompo Holdings, Inc. | Japan | 260100 | 10163 |
|  The Toronto-Dominion Bank | Canada | 141605 | 13225 |
|  UBS Group AG | Switzerland | 301900 | 11742 |
|  Willis Towers Watson PLC | United States | 21081 | 6128 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **254394** |
|  **Health Care (11.0%)** | **Health Care (11.0%)** | **Health Care (11.0%)** |  |
|  Alcon, Inc. | United States | 72399 | 5431 |
|  AstraZeneca PLC | United Kingdom | 79630 | 15553 |
|  ConvaTec Group PLC | United Kingdom | 1954755 | 5621 |
|  CSL, Ltd. | Australia | 62630 | 6153 |
|  Daiichi Sankyo Co., Ltd. | Japan | 451900 | 7967 |
|  Haleon PLC | United States | 2684039 | 13286 |
|  Merck KGaA | Germany | 57734 | 7170 |
|  Novartis AG | United States | 145260 | 22055 |
|  Qiagen NV | United States | 156953 | 6287 |
|  Roche Holding AG | United States | 32942 | 13008 |
|  Terumo Corp. | Japan | 373600 | 5002 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **107533** |
|  **Industrials (17.8%)** | **Industrials (17.8%)** | **Industrials (17.8%)** |  |
|  Atlas Copco AB - Class A | Sweden | 519104 | 9131 |
|  Babcock International Group | United Kingdom | 282854 | 4357 |
|  PLC |  |  |  |
|  Daikin Industries, Ltd. | Japan | 56700 | 6879 |
|  GEA Group AG | Germany | 120080 | 8486 |
|  Hitachi, Ltd. | Japan | 789000 | 23059 |
|  Japan Airlines Co., Ltd. | Japan | 136600 | 2222 |
|  Legrand SA | France | 80333 | 12413 |
|  Mitsubishi Electric Corp. | Japan | 317400 | 10365 |
|  Mitsui & Co., Ltd. | Japan | 232700 | 8959 |
|  MTU Aero Engines AG | Germany | 29347 | 10506 |
|  Qantas Airways, Ltd. | Australia | 668078 | 3924 |
|  RB Global, Inc. | Canada | 64550 | 6191 |
|  Schneider Electric SE | United States | 92068 | 25288 |
|  Spirax Group PLC | United Kingdom | 62853 | 5625 |
|  Taisei Corp. | Japan | 80500 | 8407 |
|  Techtronic Industries Co., Ltd. | Hong Kong | 552500 | 7354 |
|  Thales SA | France | 34505 | 10131 |
|  Weir Group PLC | United Kingdom | 175039 | 6549 |

---

**1** 

------

Research International Core Portfolio

---

| | | | |
|:---|:---|:---|:---|
| Common Stocks (97.7%) | Country | Shares/ Par <sup>+</sup> | Value<br>$(000's) |
|  **Industrials continued** | **Industrials continued** |  |  |
|  Wolters Kluwer NV | Netherlands | 58430 | 4371 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **174217** |
|  **Information Technology (10.0%)** | **Information Technology (10.0%)** | **Information Technology (10.0%)** |  |
|  ASML Holding NV | Netherlands | 14431 | 19101 |
|  Cadence Design Systems, Inc.\* | United States | 14020 | 3896 |
|  Constellation Software, Inc. | Canada | 2750 | 4828 |
|  Disco Corp. | Japan | 20200 | 8094 |
|  FUJIFILM Holdings Corp. | Japan | 190500 | 3621 |
|  Fujitsu, Ltd. | Japan | 353800 | 7190 |
|  Keyence Corp. | Japan | 19900 | 7048 |
|  NEC Corp. | Japan | 106700 | 2658 |
|  Samsung Electronics Co., Ltd. | South Korea | 88715 | 9965 |
|  Taiwan Semiconductor Manufacturing Co., Ltd. | Taiwan | 308189 | 17374 |
|  Tokyo Electron, Ltd. | Japan | 60300 | 14747 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **98522** |
|  **Materials (8.2%)** | **Materials (8.2%)** | **Materials (8.2%)** |  |
|  Akzo Nobel NV | Netherlands | 82334 | 4725 |
|  Croda International PLC | United Kingdom | 125194 | 4678 |
|  Glencore PLC \* | Australia | 1682156 | 12818 |
|  James Hardie Industries PLC\* | United States | 254881 | 4708 |
|  Linde PLC | United States | 36081 | 17887 |
|  Northern Star Resources, Ltd. | Australia | 175928 | 2568 |
|  Novozymes A/S - Class B | Denmark | 75496 | 4467 |

---

---

| | | | |
|:---|:---|:---|:---|
| Common Stocks (97.7%) | Country | Shares/ Par <sup>+</sup> | Value<br>$(000's) |
|  **Materials continued** | **Materials continued** |  |  |
|  Rio Tinto PLC | Australia | 102631 | 9540 |
|  Shin-Etsu Chemical Co., Ltd. | Japan | 245300 | 9981 |
|  Sika AG | Switzerland | 23431 | 3897 |
|  Symrise AG | Germany | 59668 | 5052 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **80321** |
|  **Utilities (2.9%)** |  |  |  |
|  APA Group | Australia | 460112 | 3164 |
|  China Resources Gas Group, Ltd. | China | 825200 | 2013 |
|  CLP Holdings, Ltd. | Hong Kong | 330500 | 3112 |
|  E.ON SE | Germany | 329865 | 7210 |
|  National Grid PLC | United Kingdom | 779267 | 13137 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **28636** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total Common Stocks (Cost: $765,722)** | &nbsp;&nbsp;&nbsp;&nbsp; **Total Common Stocks (Cost: $765,722)** | &nbsp;&nbsp;&nbsp;&nbsp; **Total Common Stocks (Cost: $765,722)** | **957467** |
|  Warrants (–%) |  |  |  |
|  **Information Technology (–%)** | **Information Technology (–%)** |  |  |
|  Constellation Software, Inc.\*,Æ | Canada | 5207 |  |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  |  | **–** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total Warrants (Cost: $–)** | &nbsp;&nbsp;&nbsp;&nbsp; **Total Warrants (Cost: $–)** | &nbsp;&nbsp;&nbsp;&nbsp; **Total Warrants (Cost: $–)** | **–** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total Investments (97.7%) (Cost: $765,722)<sup>@</sup>** | &nbsp;&nbsp;&nbsp;&nbsp; **Total Investments (97.7%) (Cost: $765,722)<sup>@</sup>** | &nbsp;&nbsp;&nbsp;&nbsp; **Total Investments (97.7%) (Cost: $765,722)<sup>@</sup>** | **957467** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Other Assets, Less Liabilities (2.3%)** | &nbsp;&nbsp;&nbsp;&nbsp; **Other Assets, Less Liabilities (2.3%)** | &nbsp;&nbsp;&nbsp;&nbsp; **Other Assets, Less Liabilities (2.3%)** | **22528** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Net Assets (100.0%)** |  |  | **979995** |

---

---

| | |
|:---|:---|
|  Investments by Country of Risk as a Percentage of Net Assets: |  |
|  Japan | 22.4% |
|  United States | 14.6% |
|  United Kingdom | 12.8% |
|  France | 8.5% |
|  Netherlands | 6.4% |
|  Other | 33.0% |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Total** | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;97.7% |

---

+ All par is stated in U.S. Dollar unless otherwise noted.

\* Non income producing

Æ Security valued using significant unobservable inputs.

---

| | |
|:---|:---|
| @ | At March 31, 2026, the aggregate cost of investments, including derivatives, for federal tax purposes (in thousands) was $765,722 and the net unrealized appreciation of investments based on that cost was $191,745 which is comprised of $239,869 aggregate gross unrealized appreciation and $48,124 aggregate gross unrealized depreciation. Because tax adjustments are calculated annually, these amounts do not reflect tax adjustments. For the previous fiscal year's federal income tax information, please refer to the Notes to the Financial Statements section in the Portfolio's most recent annual report.  |

---

**2** 

------

Research International Core Portfolio

The Fair Value Measurements and Disclosures Topic of the FASB Accounting Standards Codification defines fair value as the price that a Fund would receive to sell an asset or pay to transfer a liability in an orderly transaction between market participants at the measurement date. It establishes and requires disclosure of a fair value hierarchy, separately for each major category of asset and liability, which segregates fair value measurements into levels. A summary of the fair value hierarchy is described below:

Level 1 - fair value is determined by unadjusted quoted prices in active markets for identical securities or derivatives

Level 2 - fair value is determined by other significant observable inputs

Level 3 - fair value is determined by significant unobservable inputs

The categorization of a value determined for a financial instrument within the hierarchy is based upon the pricing transparency of the instrument and does not necessarily correspond to the Portfolio's perceived risk of that instrument.

The following is a summary of the inputs used in valuing the Portfolio's Investments at March 31, 2026.

---

| | | | |
|:---|:---|:---|:---|
| | Valuation Inputs | Valuation Inputs | Valuation Inputs |
| <br>**Description** | **Level 1 - Quoted**<br> **Prices** | **Level 2 - Other**<br> **Significant**<br> **Observable Inputs** | **Level 3**<br> **- Significant**<br> **Unobservable**<br> **Inputs** |
|  |  | *(Amounts in thousands)*  | *(Amounts in thousands)*  |
|  Assets: |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Common Stocks |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Communication Services | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6418 | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;32471 | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Consumer Staples | 1954 | 51027 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Financials | 54323 | 200071 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Industrials | 6191 | 168026 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Information Technology | 8724 | 89798 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Materials | 17887 | 62434 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; All Others |  | 258143 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Warrants |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Assets: | $95497 | $861970 | $— |

---

Management has determined that the amount of Level 3 securities compared to total net assets is not material; therefore, the reconciliation of Level 3 securities and assumptions is not shown for the period ended March 31, 2026.

**3** 

------

Abbreviations (unaudited)

**Abbreviations that may be used in the preceding statements** 

---

| | |
|:---|:---|
|  ADR | American Depositary Receipt |
|  AFC | Available Funds Cap security - Security accrues interest at an assumed or uncapped rate. If the interest rate on the underlying loans is lower than the uncapped rate, then the security will pay at the lower rate. |
|  CSTR | Collateral Strip Rate security - interest is based on the weighted net interest rate of the collateral. |
|  IO | Interest Only Security |
|  PO | Principal Only Security |
|  GDR | Global Depositary Receipt |
|  RB | Revenue Bond |
|  CPURNSA | U.S. Consumer Price Index - All Urban Consumers - Not Seasonally Adjusted |
|  IBOR | Interbank Offered Rate |
|  LIBOR | London Interbank Offered Rate |
|  SOFR | Secured Overnight Financing Rate |
|  CME | Chicago Mercantile Exchange |
|  ICE | Intercontinental Exchange |
|  FTSE | Financial Times Stock Exchange |
|  SONIO | Sterling Overnight Interbank Average Rate |
|  DAC | Designated Activity Company |
|  TBA | To Be Announced |
|  CMT | Constant Maturity Treasury |
|  OIS | Overnight Index Swaps |
|  BBR | Bank Bill Rate |
|  BBSW | Bank Bill Swap Reference Rate |
|  DIFC | Dubai International Financial Centre |
|  BRL-CDI | Brazil Interbank Deposit Rate |
|  CAONREPO | Canadian Overnight Repo Rate Average |
|  JIBAR | Johannesburg Interbank Agreed Rate |
|  EURIBOR | Euro Interbank Offered Rate |
|  PRIBOR | Prague Interbank Offered Rate |
|  ETF | Exchange Traded Fund |
|  **Currency Abbreviations** | **Currency Abbreviations** |
|  AED | United Arab Emirates Dirham |
|  AUD | Australian Dollar |
|  BRL | Brazilian Real |
|  CAD | Canadian Dollar |
|  CHF | Swiss Franc |
|  CNH | Chinese Yuan Renminbi - Offshore |
|  CNY | Chinese Yuan Renminbi |
|  COP | Colombian Peso |
|  CZK | Czech Koruna |
|  DKK | Danish Krone |
|  EGP | Egyptian Pound |
|  EUR | Euro |
|  GBP | British Pound |
|  HKD | Hong Kong Dollar |
|  IDR | Indonesian Rupiah |
|  ILS | Israeli Shekel |
|  INR | Indian Rupee |
|  JPY | Japanese Yen |
|  KRW | South Korean Won |
|  KWD | Kuwaiti Dinar |
|  KZT | Kazakhstani Tenge |
|  MXN | Mexican New Peso |
|  NOK | Norwegian Krone |
|  NZD | New Zealand Dollar |
|  PEN | Peruvian Sol |
|  PLN | Polish Zloty |
|  PYG | Paraguayan Guarani |
|  RUB | Russian Ruble |
|  SAR | Saudi Riyal |
|  SEK | Swedish Krona |
|  SGD | Singapore Dollar |
|  THB | Thai Baht |
|  TRY | Turkish Lira |
|  TWD | Taiwan Dollar |
|  USD | United States Dollar |
|  ZAR | South African Rand 1 |

---

**1**

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** NORTHWESTERN MUTUAL SERIES FUND INC

- **b. Investment Company Act file number:** 811-03990

- **c. CIK number of Registrant:** 0000742212

- **d. LEI of Registrant:** 549300T1UBX7MDSNZA55

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 720 E WISCONSIN AVE

  - **City:** MILWAUKEE

  - **State:** WI

  - **Foreign country:** US

  - **Zip / Postal Code:** 53202

  - **Telephone number:** 414-271-1444

**Item A.2. Information about the Series.**

- **a. Name of Series:** Research International Core Portfolio

- **b. EDGAR series identifier (if any):** S000018230

- **c. LEI of Series:** 549300ZQ5NCCGE71IX14

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2026-12-31

- **b. Date as of which information is reported:** 2026-03-31

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $981603486.41

**Total Liabilities:** $1316681.09

**Net Assets:** $980286805.32

**Cash Not Reported:** $17458213.70

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000050278 | 5.83%                | 4.70%                | -8.70%               |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $11500921.53             | $44922267.40                               |
| Month 2  | $8191236.32              | $40917429.80                               |
| Month 3  | $9983092.60              | $-109222971.27                             |

### Schedule of Portfolio Investments

| Name                                         | Title                                        | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| Alimentation Couche-Tard Inc                 | Alimentation Couche-Tard Inc                 | CUSIP: 01626P148<br>LEI: 549300OSW32RVX8CCZ87 | Long             | EC               | CORP              | CA        |     34478 | NS      | $1954273.81   | 0.20%             |  |  |  | No            |                  1 | On Loan: No      |
| British American Tobacco PLC                 | British American Tobacco PLC                 | CUSIP: 000000000<br>LEI: 213800FKA5MF17RJKT63 | Long             | EC               | CORP              | GB        |    241070 | NS      | $14042497.65  | 1.43%             |  |  |  | No            |                  2 | On Loan: No      |
| Banco Bradesco SA                            | Banco Bradesco SA                            | CUSIP: 059460303<br>LEI: 549300CTUU1RFXHQJE44 | Long             | EC               | CORP              | BR        |   2129555 | NS      | $7772875.75   | 0.79%             |  |  |  | No            |                  1 | On Loan: No      |
| Rio Tinto PLC                                | Rio Tinto PLC                                | CUSIP: 000000000<br>LEI: 213800YOEO5OQ72G2R82 | Long             | EC               | CORP              | GB        |    102631 | NS      | $9539735.89   | 0.97%             |  |  |  | No            |                  2 | On Loan: No      |
| Weir Group PLC/The                           | Weir Group PLC/The                           | CUSIP: 000000000<br>LEI: 549300KDR56WHY9I3D10 | Long             | EC               | CORP              | GB        |    175039 | NS      | $6548542.57   | 0.67%             |  |  |  | No            |                  2 | On Loan: No      |
| Babcock International Group PLC              | Babcock International Group PLC              | CUSIP: 000000000<br>LEI: 213800TSKOLX4EU6L377 | Long             | EC               | CORP              | GB        |    282854 | NS      | $4356967.68   | 0.44%             |  |  |  | No            |                  2 | On Loan: No      |
| AstraZeneca PLC                              | AstraZeneca PLC                              | CUSIP: 000000000<br>LEI: PY6ZZQWO2IZFZC3IOL08 | Long             | EC               | CORP              | GB        |     79630 | NS      | $15553179.84  | 1.59%             |  |  |  | No            |                  2 | On Loan: No      |
| Cadence Design Systems Inc                   | Cadence Design Systems Inc                   | CUSIP: 127387108<br>LEI: GCT7RXJOGLXPV0NXZY22 | Long             | EC               | CORP              | US        |     14020 | NS      | $3895737.40   | 0.40%             |  |  |  | No            |                  1 | On Loan: No      |
| Constellation Software Inc/Canada            | Constellation Software Inc/Canada            | CUSIP: 21037X100<br>LEI: 549300B6PYHMCTDWQV29 | Long             | EC               | CORP              | CA        |      2750 | NS      | $4827454.89   | 0.49%             |  |  |  | No            |                  1 | On Loan: No      |
| CONSTELLATION SOFTWARE INC                   | CONSTELLATION SOFTWARE INC                   | CUSIP: 000000000<br>LEI: 549300B6PYHMCTDWQV29 | N/A              | DE               |  | CA        |      5207 | NS      | $0.00         | 0.00%             |  |  |  | No            |                  3 | On Loan: No      |
| Barclays PLC                                 | Barclays PLC                                 | CUSIP: 000000000<br>LEI: 213800LBQA1Y9L22JB70 | Long             | EC               | CORP              | GB        |   2564347 | NS      | $13512696.54  | 1.38%             |  |  |  | No            |                  2 | On Loan: No      |
| Burberry Group PLC                           | Burberry Group PLC                           | CUSIP: 000000000<br>LEI: 213800PE1KEFCNFR1R50 | Long             | EC               | CORP              | GB        |    136540 | NS      | $1997842.17   | 0.20%             |  |  |  | No            |                  2 | On Loan: No      |
| Next PLC                                     | Next PLC                                     | CUSIP: 000000000<br>LEI: 213800WQD8ECPZP9PH98 | Long             | EC               | CORP              | GB        |     32927 | NS      | $5552751.29   | 0.57%             |  |  |  | No            |                  2 | On Loan: No      |
| LVMH Moet Hennessy Louis Vuitton SE          | LVMH Moet Hennessy Louis Vuitton SE          | CUSIP: 000000000<br>LEI: IOG4E947OATN0KJYSD45 | Long             | EC               | CORP              | FR        |     18353 | NS      | $10201793.38  | 1.04%             |  |  |  | No            |                  2 | On Loan: No      |
| BPER Banca SPA                               | BPER Banca SPA                               | CUSIP: 000000000<br>LEI: N747OI7JINV7RUUH6190 | Long             | EC               | CORP              | IT        |    981374 | NS      | $12810666.93  | 1.31%             |  |  |  | No            |                  2 | On Loan: No      |
| Thales SA                                    | Thales SA                                    | CUSIP: 000000000<br>LEI: 529900FNDVTQJOVVPZ19 | Long             | EC               | CORP              | FR        |     34505 | NS      | $10130920.48  | 1.03%             |  |  |  | No            |                  2 | On Loan: No      |
| GEA Group AG                                 | GEA Group AG                                 | CUSIP: 000000000<br>LEI: 549300PHUU0ZZWO8EO07 | Long             | EC               | CORP              | DE        |    120080 | NS      | $8486102.47   | 0.87%             |  |  |  | No            |                  2 | On Loan: No      |
| Pernod Ricard SA                             | Pernod Ricard SA                             | CUSIP: 000000000<br>LEI: 52990097YFPX9J0H5D87 | Long             | EC               | CORP              | FR        |     95803 | NS      | $7150643.68   | 0.73%             |  |  |  | No            |                  2 | On Loan: No      |
| Merck KGaA                                   | Merck KGaA                                   | CUSIP: 000000000<br>LEI: 529900OAREIS0MOPTW25 | Long             | EC               | CORP              | DE        |     57734 | NS      | $7169950.61   | 0.73%             |  |  |  | No            |                  2 | On Loan: No      |
| Schneider Electric SE                        | Schneider Electric SE                        | CUSIP: 000000000<br>LEI: 969500A1YF1XUYYXS284 | Long             | EC               | CORP              | FR        |     92068 | NS      | $25288324.60  | 2.58%             |  |  |  | No            |                  2 | On Loan: No      |
| E.ON SE                                      | E.ON SE                                      | CUSIP: 000000000<br>LEI: Q9MAIUP40P25UFBFG033 | Long             | EC               | CORP              | DE        |    329865 | NS      | $7209786.65   | 0.74%             |  |  |  | No            |                  2 | On Loan: No      |
| Beiersdorf AG                                | Beiersdorf AG                                | CUSIP: 000000000<br>LEI: L47NHHI0Z9X22DV46U41 | Long             | EC               | CORP              | DE        |     79692 | NS      | $7050545.23   | 0.72%             |  |  |  | No            |                  2 | On Loan: No      |
| Banco Bilbao Vizcaya Argentaria SA           | Banco Bilbao Vizcaya Argentaria SA           | CUSIP: 000000000<br>LEI: K8MS7FD7N5Z2WQ51AZ71 | Long             | EC               | CORP              | ES        |    531310 | NS      | $11596543.12  | 1.18%             |  |  |  | No            |                  2 | On Loan: No      |
| Wolters Kluwer NV                            | Wolters Kluwer NV                            | CUSIP: 000000000<br>LEI: 724500TEM53I0U077B74 | Long             | EC               | CORP              | NL        |     58430 | NS      | $4371158.37   | 0.45%             |  |  |  | No            |                  2 | On Loan: No      |
| Mastercard Inc                               | Mastercard Inc                               | CUSIP: 57636Q104<br>LEI: AR5L2ODV9HN37376R084 | Long             | EC               | CORP              | US        |     19613 | NS      | $9799831.58   | 1.00%             |  |  |  | No            |                  1 | On Loan: No      |
| Accor SA                                     | Accor SA                                     | CUSIP: 000000000<br>LEI: 969500QZC2Q0TK11NV07 | Long             | EC               | CORP              | FR        |     88660 | NS      | $4247906.76   | 0.43%             |  |  |  | No            |                  2 | On Loan: No      |
| Koninklijke KPN NV                           | Koninklijke KPN NV                           | CUSIP: 000000000<br>LEI: 549300YO0JZHAL7FVP81 | Long             | EC               | CORP              | NL        |   1422987 | NS      | $7914544.86   | 0.81%             |  |  |  | No            |                  2 | On Loan: No      |
| Ajinomoto Co Inc                             | Ajinomoto Co Inc                             | CUSIP: 000000000<br>LEI: 353800UT0TLROREPIC92 | Long             | EC               | CORP              | JP        |    184600 | NS      | $5175929.65   | 0.53%             |  |  |  | No            |                  2 | On Loan: No      |
| CLP Holdings Ltd                             | CLP Holdings Ltd                             | CUSIP: 000000000<br>LEI: 25490002BUTSMP94GO68 | Long             | EC               | CORP              | HK        |    330500 | NS      | $3111770.92   | 0.32%             |  |  |  | No            |                  2 | On Loan: No      |
| Reliance Industries Ltd                      | Reliance Industries Ltd                      | CUSIP: 000000000<br>LEI: 5493003UOETFYRONLG31 | Long             | EC               | CORP              | IN        |    299268 | NS      | $4336540.98   | 0.44%             |  |  |  | No            |                  2 | On Loan: No      |
| Samsung Fire & Marine Insurance Co Ltd       | Samsung Fire & Marine Insurance Co Ltd       | CUSIP: 000000000<br>LEI: 988400JMBDK47EW0Z936 | Long             | EC               | CORP              | KR        |     11311 | NS      | $3279338.56   | 0.33%             |  |  |  | No            |                  2 | On Loan: No      |
| Capcom Co Ltd                                | Capcom Co Ltd                                | CUSIP: 000000000<br>LEI: 529900JJWQKXS3TC8744 | Long             | EC               | CORP              | JP        |     94700 | NS      | $2008095.38   | 0.20%             |  |  |  | No            |                  2 | On Loan: No      |
| CSL Ltd                                      | CSL Ltd                                      | CUSIP: 000000000<br>LEI: 529900ECSECK5ZDQTE14 | Long             | EC               | CORP              | AU        |     62630 | NS      | $6152676.17   | 0.63%             |  |  |  | No            |                  2 | On Loan: No      |
| APA Group                                    | APA Group                                    | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | AU        |    460112 | NS      | $3163964.75   | 0.32%             |  |  |  | No            |                  2 | On Loan: No      |
| KDDI Corp                                    | KDDI Corp                                    | CUSIP: 000000000<br>LEI: 5299003FU7V4I45FU310 | Long             | EC               | CORP              | JP        |    570400 | NS      | $9768045.23   | 1.00%             |  |  |  | No            |                  2 | On Loan: No      |
| Daikin Industries Ltd                        | Daikin Industries Ltd                        | CUSIP: 000000000<br>LEI: 549300Y7FWSTSHMW5Y57 | Long             | EC               | CORP              | JP        |     56700 | NS      | $6878609.80   | 0.70%             |  |  |  | No            |                  2 | On Loan: No      |
| Aristocrat Leisure Ltd                       | Aristocrat Leisure Ltd                       | CUSIP: 000000000<br>LEI: 529900TE2HO3OZKYKC27 | Long             | EC               | CORP              | AU        |    108521 | NS      | $3448183.98   | 0.35%             |  |  |  | No            |                  2 | On Loan: No      |
| Pan Pacific International Holdings Corp      | Pan Pacific International Holdings Corp      | CUSIP: 000000000<br>LEI: 529900QLHJM2E18A5763 | Long             | EC               | CORP              | JP        |    967900 | NS      | $5937314.54   | 0.61%             |  |  |  | No            |                  2 | On Loan: No      |
| Disco Corp                                   | Disco Corp                                   | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | JP        |     20200 | NS      | $8094076.66   | 0.83%             |  |  |  | No            |                  2 | On Loan: No      |
| FUJIFILM Holdings Corp                       | FUJIFILM Holdings Corp                       | CUSIP: 000000000<br>LEI: 529900UBKMFM0ST6H474 | Long             | EC               | CORP              | JP        |    190500 | NS      | $3620573.99   | 0.37%             |  |  |  | No            |                  2 | On Loan: No      |
| Fujitsu Ltd                                  | Fujitsu Ltd                                  | CUSIP: 000000000<br>LEI: 3538000246DHJLRTUZ24 | Long             | EC               | CORP              | JP        |    353800 | NS      | $7190123.71   | 0.73%             |  |  |  | No            |                  2 | On Loan: No      |
| Advanced Info Service PCL                    | Advanced Info Service PCL                    | CUSIP: 000000000<br>LEI: 529900DU2YW1NO5RMU78 | Long             | EC               | CORP              | TH        |    397800 | NS      | $4553240.99   | 0.46%             |  |  |  | No            |                  2 | On Loan: No      |
| James Hardie Industries PLC                  | James Hardie Industries PLC                  | CUSIP: 000000000<br>LEI: 635400NSGXKTVOO7JU45 | Long             | EC               | CORP              | IE        |    254881 | NS      | $4707554.02   | 0.48%             |  |  |  | No            |                  2 | On Loan: No      |
| Hitachi Ltd                                  | Hitachi Ltd                                  | CUSIP: 000000000<br>LEI: 549300T6IPOCDWLKC615 | Long             | EC               | CORP              | JP        |    789000 | NS      | $23059015.26  | 2.35%             |  |  |  | No            |                  2 | On Loan: No      |
| Keyence Corp                                 | Keyence Corp                                 | CUSIP: 000000000<br>LEI: 529900M7PQBS7A89DZ11 | Long             | EC               | CORP              | JP        |     19900 | NS      | $7047689.55   | 0.72%             |  |  |  | No            |                  2 | On Loan: No      |
| China Resources Gas Group Ltd                | China Resources Gas Group Ltd                | CUSIP: 000000000<br>LEI: 529900A0E1J5JSOKEK83 | Long             | EC               | CORP              | BM        |    825200 | NS      | $2012785.63   | 0.21%             |  |  |  | No            |                  2 | On Loan: No      |
| Mizuho Financial Group Inc                   | Mizuho Financial Group Inc                   | CUSIP: 000000000<br>LEI: 353800CI5L6DDAN5XZ33 | Long             | EC               | CORP              | JP        |    728400 | NS      | $29073976.04  | 2.97%             |  |  |  | No            |                  2 | On Loan: No      |
| Mitsubishi Electric Corp                     | Mitsubishi Electric Corp                     | CUSIP: 000000000<br>LEI: 549300TRXM9Y6561AX39 | Long             | EC               | CORP              | JP        |    317400 | NS      | $10365485.63  | 1.06%             |  |  |  | No            |                  2 | On Loan: No      |
| Mitsui & Co Ltd                              | Mitsui & Co Ltd                              | CUSIP: 000000000<br>LEI: 2NRSB4GOU9DD6CNW5R48 | Long             | EC               | CORP              | JP        |    232700 | NS      | $8959013.47   | 0.91%             |  |  |  | No            |                  2 | On Loan: No      |
| NEC Corp                                     | NEC Corp                                     | CUSIP: 000000000<br>LEI: 5493000QYMPFRTEY4K28 | Long             | EC               | CORP              | JP        |    106700 | NS      | $2658285.07   | 0.27%             |  |  |  | No            |                  2 | On Loan: No      |
| Nitori Holdings Co Ltd                       | Nitori Holdings Co Ltd                       | CUSIP: 000000000<br>LEI: N/A                  | Long             | EC               | CORP              | JP        |    140400 | NS      | $2229900.43   | 0.23%             |  |  |  | No            |                  2 | On Loan: No      |
| Qantas Airways Ltd                           | Qantas Airways Ltd                           | CUSIP: 000000000<br>LEI: YLXNW6TI6QSK1H8H0N82 | Long             | EC               | CORP              | AU        |    668078 | NS      | $3923705.65   | 0.40%             |  |  |  | No            |                  2 | On Loan: No      |
| Northern Star Resources Ltd                  | Northern Star Resources Ltd                  | CUSIP: 000000000<br>LEI: 254900XFXCRYYZAX6M78 | Long             | EC               | CORP              | AU        |    175928 | NS      | $2568342.94   | 0.26%             |  |  |  | No            |                  2 | On Loan: No      |
| SoftBank Group Corp                          | SoftBank Group Corp                          | CUSIP: 000000000<br>LEI: 5493003BZYYYCDIO0R13 | Long             | EC               | CORP              | JP        |     86300 | NS      | $2074145.77   | 0.21%             |  |  |  | No            |                  2 | On Loan: No      |
| Samsung Electronics Co Ltd                   | Samsung Electronics Co Ltd                   | CUSIP: 000000000<br>LEI: 9884007ER46L6N7EI764 | Long             | EC               | CORP              | KR        |     88715 | NS      | $9965359.44   | 1.02%             |  |  |  | No            |                  2 | On Loan: No      |
| Shin-Etsu Chemical Co Ltd                    | Shin-Etsu Chemical Co Ltd                    | CUSIP: 000000000<br>LEI: 353800PX8Q64N86H5W41 | Long             | EC               | CORP              | JP        |    245300 | NS      | $9980663.82   | 1.02%             |  |  |  | No            |                  2 | On Loan: No      |
| Shimano Inc                                  | Shimano Inc                                  | CUSIP: 000000000<br>LEI: 529900L32YT3P9DECR10 | Long             | EC               | CORP              | JP        |     41600 | NS      | $4359331.73   | 0.44%             |  |  |  | No            |                  2 | On Loan: No      |
| Sony Group Corp                              | Sony Group Corp                              | CUSIP: 000000000<br>LEI: 529900R5WX9N2OI2N910 | Long             | EC               | CORP              | JP        |    426700 | NS      | $8801261.48   | 0.90%             |  |  |  | No            |                  2 | On Loan: No      |
| Suzuki Motor Corp                            | Suzuki Motor Corp                            | CUSIP: 000000000<br>LEI: 353800D83H0V3ZV1SV24 | Long             | EC               | CORP              | JP        |    662600 | NS      | $7938591.54   | 0.81%             |  |  |  | No            |                  2 | On Loan: No      |
| Taisei Corp                                  | Taisei Corp                                  | CUSIP: 000000000<br>LEI: 529900TF7XJKIOWMLQ79 | Long             | EC               | CORP              | JP        |     80500 | NS      | $8406906.80   | 0.86%             |  |  |  | No            |                  2 | On Loan: No      |
| Terumo Corp                                  | Terumo Corp                                  | CUSIP: 000000000<br>LEI: 353800JX1R4582QVK932 | Long             | EC               | CORP              | JP        |    373600 | NS      | $5002385.13   | 0.51%             |  |  |  | No            |                  2 | On Loan: No      |
| Taiwan Semiconductor Manufacturing Co Ltd    | Taiwan Semiconductor Manufacturing Co Ltd    | CUSIP: 000000000<br>LEI: 549300KB6NK5SBD14S87 | Long             | EC               | CORP              | TW        |    308189 | NS      | $17374289.54  | 1.77%             |  |  |  | No            |                  2 | On Loan: No      |
| Tokyo Electron Ltd                           | Tokyo Electron Ltd                           | CUSIP: 000000000<br>LEI: 549300H5LSF8DP3RIJ34 | Long             | EC               | CORP              | JP        |     60300 | NS      | $14746492.03  | 1.50%             |  |  |  | No            |                  2 | On Loan: No      |
| Unicharm Corp                                | Unicharm Corp                                | CUSIP: 000000000<br>LEI: 353800UQ4BZIJTAQEG85 | Long             | EC               | CORP              | JP        |    985500 | NS      | $5738762.25   | 0.59%             |  |  |  | No            |                  2 | On Loan: No      |
| Novartis AG                                  | Novartis AG                                  | CUSIP: 000000000<br>LEI: 5493007HIVTX6SY6XD66 | Long             | EC               | CORP              | CH        |    145260 | NS      | $22054759.49  | 2.25%             |  |  |  | No            |                  2 | On Loan: No      |
| Eni SpA                                      | Eni SpA                                      | CUSIP: 000000000<br>LEI: BUCRF72VH5RBN7X3VL35 | Long             | EC               | CORP              | IT        |    519668 | NS      | $14756647.53  | 1.51%             |  |  |  | No            |                  2 | On Loan: No      |
| BNP Paribas SA                               | BNP Paribas SA                               | CUSIP: 000000000<br>LEI: R0MUWSFPU8MPRO8K5P83 | Long             | EC               | CORP              | FR        |    139435 | NS      | $13282718.70  | 1.35%             |  |  |  | No            |                  2 | On Loan: No      |
| RB Global Inc                                | RB Global Inc                                | CUSIP: 74935Q107<br>LEI: 5493002H8U24DJXQ4886 | Long             | EC               | CORP              | CA        |     64550 | NS      | $6190507.87   | 0.63%             |  |  |  | No            |                  1 | On Loan: No      |
| Toronto-Dominion Bank/The                    | Toronto-Dominion Bank/The                    | CUSIP: 891160509<br>LEI: PT3QB789TSUIDF371261 | Long             | EC               | CORP              | CA        |    141605 | NS      | $13225017.32  | 1.35%             |  |  |  | No            |                  1 | On Loan: No      |
| ASML Holding NV                              | ASML Holding NV                              | CUSIP: 000000000<br>LEI: 724500Y6DUVHQD6OXN27 | Long             | EC               | CORP              | NL        |     14431 | NS      | $19101407.54  | 1.95%             |  |  |  | No            |                  2 | On Loan: No      |
| Cie Financiere Richemont SA                  | Cie Financiere Richemont SA                  | CUSIP: 000000000<br>LEI: 549300YIPGJ6UX2QPS51 | Long             | EC               | CORP              | CH        |     49040 | NS      | $8738578.29   | 0.89%             |  |  |  | No            |                  2 | On Loan: No      |
| UBS Group AG                                 | UBS Group AG                                 | CUSIP: 000000000<br>LEI: 549300SZJ9VS8SGXAN81 | Long             | EC               | CORP              | CH        |    301900 | NS      | $11742101.85  | 1.20%             |  |  |  | No            |                  2 | On Loan: No      |
| Sika AG                                      | Sika AG                                      | CUSIP: 000000000<br>LEI: 549300R3N69ECGYPU434 | Long             | EC               | CORP              | CH        |     23431 | NS      | $3896794.72   | 0.40%             |  |  |  | No            |                  2 | On Loan: No      |
| Alcon AG                                     | Alcon AG                                     | CUSIP: 000000000<br>LEI: 549300LDT5AP8S0NBM78 | Long             | EC               | CORP              | CH        |     72399 | NS      | $5431437.54   | 0.55%             |  |  |  | No            |                  2 | On Loan: No      |
| Roche Holding AG                             | Roche Holding AG                             | CUSIP: 000000000<br>LEI: 549300U41AUUVOAAOB37 | Long             | EC               | CORP              | CH        |     32942 | NS      | $13007670.80  | 1.33%             |  |  |  | No            |                  2 | On Loan: No      |
| Techtronic Industries Co Ltd                 | Techtronic Industries Co Ltd                 | CUSIP: 000000000<br>LEI: 549300HZW2SBE758OK89 | Long             | EC               | CORP              | HK        |    552500 | NS      | $7354130.55   | 0.75%             |  |  |  | No            |                  2 | On Loan: No      |
| MTU Aero Engines AG                          | MTU Aero Engines AG                          | CUSIP: 000000000<br>LEI: 529900807L67JY81RD65 | Long             | EC               | CORP              | DE        |     29347 | NS      | $10506332.44  | 1.07%             |  |  |  | No            |                  2 | On Loan: No      |
| Daiichi Sankyo Co Ltd                        | Daiichi Sankyo Co Ltd                        | CUSIP: 000000000<br>LEI: 353800XGIU2IHQGC9504 | Long             | EC               | CORP              | JP        |    451900 | NS      | $7967210.44   | 0.81%             |  |  |  | No            |                  2 | On Loan: No      |
| London Stock Exchange Group PLC              | London Stock Exchange Group PLC              | CUSIP: 000000000<br>LEI: 213800QAUUUP6I445N30 | Long             | EC               | CORP              | GB        |     78989 | NS      | $9335387.91   | 0.95%             |  |  |  | No            |                  2 | On Loan: No      |
| Legrand SA                                   | Legrand SA                                   | CUSIP: 000000000<br>LEI: 969500XXRPGD7HCAFA90 | Long             | EC               | CORP              | FR        |     80333 | NS      | $12413431.65  | 1.27%             |  |  |  | No            |                  2 | On Loan: No      |
| TotalEnergies SE                             | TotalEnergies SE                             | CUSIP: 000000000<br>LEI: 529900S21EQ1BO4ESM68 | Long             | EC               | CORP              | FR        |    225407 | NS      | $20812563.25  | 2.12%             |  |  |  | No            |                  2 | On Loan: No      |
| Galp Energia SGPS SA                         | Galp Energia SGPS SA                         | CUSIP: 000000000<br>LEI: 2138003319Y7NM75FG53 | Long             | EC               | CORP              | PT        |    481589 | NS      | $11708157.89  | 1.19%             |  |  |  | No            |                  2 | On Loan: No      |
| Symrise AG                                   | Symrise AG                                   | CUSIP: 000000000<br>LEI: 529900D82I6R9601CF26 | Long             | EC               | CORP              | DE        |     59668 | NS      | $5051996.33   | 0.52%             |  |  |  | No            |                  2 | On Loan: No      |
| Jeronimo Martins SGPS SA                     | Jeronimo Martins SGPS SA                     | CUSIP: 000000000<br>LEI: 259400A8SZP10GB5IB19 | Long             | EC               | CORP              | PT        |    233266 | NS      | $5595816.94   | 0.57%             |  |  |  | No            |                  2 | On Loan: No      |
| Glencore PLC                                 | Glencore PLC                                 | CUSIP: 000000000<br>LEI: 2138002658CPO9NBH955 | Long             | EC               | CORP              | JE        |   1682156 | NS      | $12818034.73  | 1.31%             |  |  |  | No            |                  2 | On Loan: No      |
| AIA Group Ltd                                | AIA Group Ltd                                | CUSIP: 000000000<br>LEI: ZP5ILWVSYE4LJGMMVD57 | Long             | EC               | CORP              | HK        |   1238000 | NS      | $13907505.10  | 1.42%             |  |  |  | No            |                  2 | On Loan: No      |
| Sands China Ltd                              | Sands China Ltd                              | CUSIP: 000000000<br>LEI: 549300EVO6UZDGY05787 | Long             | EC               | CORP              | KY        |    874000 | NS      | $1857582.83   | 0.19%             |  |  |  | No            |                  2 | On Loan: No      |
| Sompo Holdings Inc                           | Sompo Holdings Inc                           | CUSIP: 000000000<br>LEI: 353800CWW4SRGEYEB512 | Long             | EC               | CORP              | JP        |    260100 | NS      | $10162970.95  | 1.04%             |  |  |  | No            |                  2 | On Loan: No      |
| Novonesis Novozymes B                        | Novonesis Novozymes B                        | CUSIP: 000000000<br>LEI: 529900T6WNZXD2R3JW38 | Long             | EC               | CORP              | DK        |     75496 | NS      | $4467080.64   | 0.46%             |  |  |  | No            |                  2 | On Loan: No      |
| Japan Airlines Co Ltd                        | Japan Airlines Co Ltd                        | CUSIP: 000000000<br>LEI: 3538002MH5L1QZZ93477 | Long             | EC               | CORP              | JP        |    136600 | NS      | $2222489.25   | 0.23%             |  |  |  | No            |                  2 | On Loan: No      |
| Bank of Ireland Group PLC                    | Bank of Ireland Group PLC                    | CUSIP: 000000000<br>LEI: 635400C8EK6DRI12LJ39 | Long             | EC               | CORP              | IE        |    624693 | NS      | $11432202.35  | 1.17%             |  |  |  | No            |                  2 | On Loan: No      |
| Convatec Group PLC                           | Convatec Group PLC                           | CUSIP: 000000000<br>LEI: 213800LS272L4FIDOH92 | Long             | EC               | CORP              | GB        |   1954755 | NS      | $5620912.54   | 0.57%             |  |  |  | No            |                  2 | On Loan: No      |
| National Grid PLC                            | National Grid PLC                            | CUSIP: 000000000<br>LEI: 8R95QZMKZLJX5Q2XR704 | Long             | EC               | CORP              | GB        |    779267 | NS      | $13137618.63  | 1.34%             |  |  |  | No            |                  2 | On Loan: No      |
| B3 SA - Brasil Bolsa Balcao                  | B3 SA - Brasil Bolsa Balcao                  | CUSIP: 000000000<br>LEI: 4GTK5S46E6H318LMDS44 | Long             | EC               | CORP              | BR        |   2468000 | NS      | $8766894.79   | 0.89%             |  |  |  | No            |                  1 | On Loan: No      |
| Akzo Nobel NV                                | Akzo Nobel NV                                | CUSIP: 000000000<br>LEI: 724500XYIJUGXAA5QD70 | Long             | EC               | CORP              | NL        |     82334 | NS      | $4724749.52   | 0.48%             |  |  |  | No            |                  2 | On Loan: No      |
| Croda International PLC                      | Croda International PLC                      | CUSIP: 000000000<br>LEI: 2138004WCNBFJEEOXV26 | Long             | EC               | CORP              | GB        |    125194 | NS      | $4678090.89   | 0.48%             |  |  |  | No            |                  2 | On Loan: No      |
| HDFC Bank Ltd                                | HDFC Bank Ltd                                | CUSIP: 000000000<br>LEI: 335800ZQ6I4E2JXENC50 | Long             | EC               | CORP              | IN        |    886155 | NS      | $7046146.91   | 0.72%             |  |  |  | No            |                  2 | On Loan: No      |
| Atlas Copco AB                               | Atlas Copco AB                               | CUSIP: 000000000<br>LEI: 213800T8PC8Q4FYJZR07 | Long             | EC               | CORP              | SE        |    519104 | NS      | $9130503.70   | 0.93%             |  |  |  | No            |                  2 | On Loan: No      |
| NatWest Group PLC                            | NatWest Group PLC                            | CUSIP: 000000000<br>LEI: 2138005O9XJIJN4JPN90 | Long             | EC               | CORP              | GB        |   1235900 | NS      | $9170444.58   | 0.94%             |  |  |  | No            |                  2 | On Loan: No      |
| Davide Campari-Milano NV                     | Davide Campari-Milano NV                     | CUSIP: 000000000<br>LEI: 213800ED5AN2J56N6Z02 | Long             | EC               | CORP              | NL        |    880768 | NS      | $6272997.66   | 0.64%             |  |  |  | No            |                  2 | On Loan: No      |
| Haleon PLC                                   | Haleon PLC                                   | CUSIP: 000000000<br>LEI: 549300PSB3WWEODCUP19 | Long             | EC               | CORP              | GB        |   2684039 | NS      | $13285800.32  | 1.36%             |  |  |  | No            |                  2 | On Loan: No      |
| Euronext NV                                  | Euronext NV                                  | CUSIP: 000000000<br>LEI: 724500QJ4QSZ3H9QU415 | Long             | EC               | CORP              | NL        |     81008 | NS      | $13034090.70  | 1.33%             |  |  |  | No            |                  2 | On Loan: No      |
| Cie Generale des Etablissements Michelin SCA | Cie Generale des Etablissements Michelin SCA | CUSIP: 000000000<br>LEI: 549300SOSI58J6VIW052 | Long             | EC               | CORP              | FR        |    148263 | NS      | $5048701.29   | 0.52%             |  |  |  | No            |                  2 | On Loan: No      |
| QIAGEN NV                                    | QIAGEN NV                                    | CUSIP: 000000000<br>LEI: 54930036WK3GMCN17Z57 | Long             | EC               | CORP              | NL        |    156953 | NS      | $6287174.20   | 0.64%             |  |  |  | No            |                  2 | On Loan: No      |
| Hiscox Ltd                                   | Hiscox Ltd                                   | CUSIP: 000000000<br>LEI: 5493007JXOLJ0QCY2D70 | Long             | EC               | CORP              | BM        |    540525 | NS      | $10893491.66  | 1.11%             |  |  |  | No            |                  2 | On Loan: No      |
| Spirax Group PLC                             | Spirax Group PLC                             | CUSIP: 000000000<br>LEI: 213800WFVZQMHOZP2W17 | Long             | EC               | CORP              | GB        |     62853 | NS      | $5625223.42   | 0.57%             |  |  |  | No            |                  2 | On Loan: No      |
| Cellnex Telecom SA                           | Cellnex Telecom SA                           | CUSIP: 000000000<br>LEI: 5493008T4YG3AQUI7P67 | Long             | EC               | CORP              | ES        |    189504 | NS      | $6152715.17   | 0.63%             |  |  |  | No            |                  2 | On Loan: No      |
| Beazley PLC                                  | Beazley PLC                                  | CUSIP: 000000000<br>LEI: 213800VTOMUWD41GIT12 | Long             | EC               | CORP              | GB        |    347941 | NS      | $5837594.90   | 0.60%             |  |  |  | No            |                  2 | On Loan: No      |
| ING Groep NV                                 | ING Groep NV                                 | CUSIP: 000000000<br>LEI: 549300NYKK9MWM7GGW15 | Long             | EC               | CORP              | NL        |    534030 | NS      | $13953824.08  | 1.42%             |  |  |  | No            |                  2 | On Loan: No      |
| Aon PLC                                      | Aon PLC                                      | CUSIP: 000000000<br>LEI: 635400FALWQYX5E6QC64 | Long             | EC               | CORP              | IE        |     26736 | NS      | $8629846.08   | 0.88%             |  |  |  | No            |                  1 | On Loan: No      |
| Linde PLC                                    | Linde PLC                                    | CUSIP: 000000000<br>LEI: 5299003QR1WT0EF88V51 | Long             | EC               | CORP              | IE        |     36081 | NS      | $17887516.56  | 1.82%             |  |  |  | No            |                  1 | On Loan: No      |
| Willis Towers Watson PLC                     | Willis Towers Watson PLC                     | CUSIP: 000000000<br>LEI: 549300WHC56FF48KL350 | Long             | EC               | CORP              | IE        |     21081 | NS      | $6128246.70   | 0.63%             |  |  |  | No            |                  1 | On Loan: No      |
| Spotify Technology SA                        | Spotify Technology SA                        | CUSIP: 000000000<br>LEI: 549300B4X0JHWV0DTD60 | Long             | EC               | CORP              | LU        |     13236 | NS      | $6418268.76   | 0.65%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2026-04-28

**Name of Applicant:** NORTHWESTERN MUTUAL SERIES FUND INC

**Signature:** Linda Wisniewski

**Name of Signer:** Linda Wisniewski

**Title:** Controller and Chief Accounting Officer