# EDGAR Filing Document

**Accession Number:** 0000742212
**File Stem:** 0001410368-26-053257
**Filing Date:** 2026-5
**Character Count:** 63641
**Document Hash:** f876608eab02fdbaf799eaa7b8ac88be
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001410368-26-053257.hdr.sgml**: 20260527

**ACCESSION NUMBER**: 0001410368-26-053257

**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:** 261024824

**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

### Mid Cap Value Portfolio (Series ID: S000000053)

| Class ID   | Class Name              | Ticker Symbol   |
|:---|:---|:---|
| C000000088 | Mid Cap Value Portfolio |  |

## Nport-Ex

Mid Cap Value Portfolio

SCHEDULE OF INVESTMENTS

**March 31, 2026 (unaudited)** 

---

| | | |
|:---|:---|:---|
| Common Stocks<br>(97.3%) | Shares/<br>Par <sup>+</sup> | Value<br>$(000's) |
|  **Communication Services (0.5%)** | **Communication Services (0.5%)** | **Communication Services (0.5%)** |
|  Publicis Groupe SA | 36501 | 3019 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **3019** |
|  **Consumer Discretionary (3.3%)** | **Consumer Discretionary (3.3%)** | **Consumer Discretionary (3.3%)** |
|  BorgWarner, Inc. | 65792 | 3570 |
|  Compagnie Generale des Etablissements Michelin | 89585 | 3051 |
|  Gentex Corp. | 159659 | 3488 |
|  Mohawk Industries, Inc. \* | 31382 | 3090 |
|  PulteGroup, Inc. | 49200 | 5786 |
|  Sodexo SA | 54895 | 2818 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **21803** |
|  **Consumer Staples (7.1%)** | **Consumer Staples (7.1%)** | **Consumer Staples (7.1%)** |
|  The Clorox Co. | 20510 | 2125 |
|  Colgate-Palmolive Co. | 7618 | 649 |
|  Heineken NV | 56830 | 4373 |
|  Henkel AG & Co. KGaA - Preference Shares | 36453 | 2801 |
|  Kenvue, Inc. | 465839 | 8031 |
|  Kimberly-Clark Corp. | 81372 | 7850 |
|  Koninklijke Ahold Delhaize NV | 149148 | 6963 |
|  Magnum Ice Cream Co. NV \* | 94848 | 1400 |
|  Mondelez International, Inc. | 67722 | 3904 |
|  Pernod Ricard SA | 40575 | 3029 |
|  Sysco Corp. | 45456 | 3242 |
|  Target Corp. | 19603 | 2376 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **46743** |
|  **Energy (7.9%)** | **Energy (7.9%)** | **Energy (7.9%)** |
|  Baker Hughes Co. | 233538 | 14257 |
|  Coterra Energy, Inc. | 128717 | 4523 |
|  Diamondback Energy, Inc. | 41361 | 8181 |
|  Enterprise Products Partners LP | 252172 | 9542 |
|  EQT Corp. | 58766 | 3740 |
|  Phillips 66 | 38541 | 7021 |
|  SLB, Ltd. | 94524 | 4858 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **52122** |
|  **Financials (17.6%)** | **Financials (17.6%)** | **Financials (17.6%)** |
|  The Allstate Corp. | 32625 | 6765 |
|  Ameriprise Financial, Inc. | 10931 | 4858 |
|  The Bank of New York Mellon Corp. | 15177 | 1800 |
|  Commerce Bancshares, Inc. | 241318 | 11873 |
|  Equity Residential | 148836 | 8804 |
|  First Hawaiian, Inc. | 175202 | 4317 |

---

---

| | | |
|:---|:---|:---|
| Common Stocks<br>(97.3%) | Shares/<br>Par <sup>+</sup> | Value<br>$(000's) |
|  **Financials continued** | **Financials continued** | **Financials continued** |
|  The Hanover Insurance Group, Inc. | 15110 | 2619 |
|  Marsh & McLennan Cos., Inc. | 66112 | 11467 |
|  Northern Trust Corp. | 64643 | 9022 |
|  Prosperity Bancshares, Inc. | 129981 | 8732 |
|  Raymond James |  |  |
|  Financial, Inc. | 19712 | 2854 |
|  Reinsurance Group of America, Inc. | 53150 | 10851 |
| T. Rowe Price Group, Inc. | 46820 | 4220 |
|  Truist Financial Corp. | 164770 | 7575 |
|  U.S. Bancorp | 152186 | 7915 |
|  Westamerica Bancorporation | 67797 | 3536 |
|  Willis Towers Watson PLC | 31335 | 9109 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **116317** |
|  **Health Care (14.3%)** | **Health Care (14.3%)** | **Health Care (14.3%)** |
|  Becton Dickinson and Co. | 60691 | 9542 |
|  Cencora, Inc. | 8136 | 2556 |
|  Envista Holdings Corp. \* | 198378 | 5033 |
|  GE HealthCare Technologies, Inc. | 125023 | 8899 |
|  Henry Schein, Inc. \* | 170580 | 12572 |
|  IQVIA Holdings, Inc. \* | 33066 | 5639 |
|  Labcorp Holdings, Inc. | 42648 | 11379 |
|  Medtronic PLC | 74865 | 6487 |
|  Quest Diagnostics, Inc. | 33561 | 6577 |
|  Universal Health Services, Inc. - Class B | 36238 | 6486 |
|  Waters Corp. \* | 10964 | 3265 |
|  Zimmer Biomet Holdings, Inc. | 176202 | 15932 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **94367** |
|  **Industrials (16.9%)** | **Industrials (16.9%)** | **Industrials (16.9%)** |
|  A.O. Smith Corp. | 89094 | 5875 |
|  ABM Industries, Inc. | 6929 | 267 |
|  Bunzl PLC | 348950 | 10454 |
|  CSX Corp. | 244572 | 10040 |
|  Cummins, Inc. | 9308 | 5008 |
|  Daikin Industries, Ltd. | 36600 | 4440 |
|  Dover Corp. | 8865 | 1848 |
|  Fortive Corp. | 59222 | 3274 |
|  Hexcel Corp. | 31359 | 2538 |
|  IDEX Corp. | 11584 | 2196 |
|  L3Harris Technologies, Inc. | 31532 | 10883 |

---

---

| | | |
|:---|:---|:---|
| Common Stocks<br>(97.3%) | Shares/<br>Par <sup>+</sup> | Value<br>$(000's) |
|  **Industrials continued** | **Industrials continued** | **Industrials continued** |
|  Masco Corp. | 60230 | 3636 |
|  MSC Industrial Direct Co., Inc. | 99035 | 9138 |
|  Norfolk Southern Corp. | 22821 | 6550 |
|  Oshkosh Corp. | 27046 | 3981 |
|  Owens Corning | 39789 | 4306 |
|  PACCAR, Inc. | 27300 | 3153 |
|  Republic Services, Inc. | 10581 | 2317 |
|  Sensata Technologies Holding PLC | 129180 | 4550 |
|  Southwest Airlines Co. | 99898 | 3753 |
|  Stanley Black & Decker, Inc. | 32693 | 2323 |
|  Sunbelt Rentals Holdings, Inc. | 53056 | 3388 |
|  The Timken Co. | 46552 | 4682 |
|  The Toro Co. | 32111 | 3000 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **111600** |
|  **Information Technology (9.0%)** | **Information Technology (9.0%)** | **Information Technology (9.0%)** |
|  Akamai Technologies, Inc. \* | 47602 | 5467 |
|  Amdocs, Ltd. | 88789 | 5794 |
|  CDW Corp. | 32916 | 3983 |
|  Cognizant Technology Solutions Corp. | 92781 | 5692 |
|  F5, Inc. \* | 24940 | 7216 |
|  HP, Inc. | 225883 | 4339 |
|  Infineon Technologies AG | 143649 | 6312 |
|  NXP Semiconductors NV | 22283 | 4387 |
|  Ralliant Corp. | 83302 | 3465 |
|  TE Connectivity PLC | 11605 | 2426 |
|  Teradyne, Inc. | 24374 | 7226 |
|  Vontier Corp. | 79603 | 2823 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **59130** |
|  **Materials (3.9%)** | **Materials (3.9%)** | **Materials (3.9%)** |
|  Amrize, Ltd. \* | 90753 | 5084 |
|  Packaging Corp. of America | 51345 | 10897 |
|  PPG Industries, Inc. | 46045 | 4921 |
|  Reliance, Inc. | 16896 | 5135 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **26037** |
|  **Real Estate (6.8%)** | **Real Estate (6.8%)** | **Real Estate (6.8%)** |
|  Agree Realty Corp. | 34380 | 2592 |
|  American Tower Corp. | 31860 | 5498 |
|  CareTrust REIT, Inc. | 74974 | 2748 |
|  Essex Property Trust, Inc. | 8285 | 2005 |
|  Healthpeak Properties, Inc. | 301227 | 4949 |
|  Iron Mountain, Inc. | 19965 | 2039 |

---

**1** 

------

Mid Cap Value Portfolio

---

| | | |
|:---|:---|:---|
| Common Stocks<br>(97.3%) | Shares/<br>Par <sup>+</sup> | Value<br>$(000's) |
|  **Real Estate continued** | **Real Estate continued** | **Real Estate continued** |
|  Public Storage | 18805 | 5094 |
|  Realty Income Corp. | 153471 | 9389 |
|  Regency Centers Corp. | 32475 | 2457 |
|  Ventas, Inc. | 65010 | 5317 |
|  VICI Properties, Inc. | 103008 | 2814 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** |  | **44902** |
|  **Utilities (10.0%)** | **Utilities (10.0%)** | **Utilities (10.0%)** |
|  Duke Energy Corp. | 49271 | 6451 |
|  Evergy, Inc. | 139011 | 11388 |
|  Eversource Energy | 92660 | 6419 |
|  Northwestern Energy |  |  |
|  Group, Inc. | 98416 | 6490 |
|  ONE Gas, Inc. | 114752 | 9884 |
|  ONEOK, Inc. | 35191 | 3181 |
|  PPL Corp. | 144055 | 5503 |
|  Spire, Inc. | 62342 | 5644 |
|  Xcel Energy, Inc. | 141737 | 11260 |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total** | &nbsp;&nbsp;&nbsp;&nbsp; **Total** | **66220** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total Common Stocks<br>(Cost: $613,495)** | &nbsp;&nbsp;&nbsp;&nbsp; **Total Common Stocks<br>(Cost: $613,495)** | **642260** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Total Investments (97.3%)<br>(Cost: $613,495)<sup>@</sup>** | &nbsp;&nbsp;&nbsp;&nbsp; **Total Investments (97.3%)<br>(Cost: $613,495)<sup>@</sup>** | **642260** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Other Assets, Less<br>Liabilities (2.7%)** | &nbsp;&nbsp;&nbsp;&nbsp; **Other Assets, Less<br>Liabilities (2.7%)** | **17755** |
| &nbsp;&nbsp;&nbsp;&nbsp; **Net Assets (100.0%)** | &nbsp;&nbsp;&nbsp;&nbsp; **Net Assets (100.0%)** | **660015** |

---

**Over the Counter Derivatives** 

**Forward Foreign Currency Contracts** 

---

| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| Type | Counterparty | Currency | Foreign Principal<br> Amount<br> Covered by<br>Contract (000s) | USD Principal<br> Amount<br> Covered by<br>Contract (000's) | Settlement<br>Date | Unrealized<br>Appreciation<br>(000's) | Unrealized<br>(Depreciation)<br>(000's) | Net<br>Unrealized<br> Appreciation/<br>(Depreciation)<br>(000's) |
| Buy | Morgan Stanley Bank NA | EUR | 682 | 792 | 6/26/26 | $7 | $— | $7 |
| Sell | Morgan Stanley Bank NA | EUR | 25094 | 29117 | 6/26/26 | 7 |  | 7 |
| Buy | Bank of America NA | GBP | 619 | 820 | 6/26/26 | 2 |  | 2 |
| Sell | Bank of America NA | GBP | 9349 | 12372 | 6/26/26 | 117 |  | 117 |
| Buy | Bank of America NA | JPY | 47443 | 301 | 6/26/26 | 1 |  | 1 |
| Sell | Bank of America NA | JPY | 638066 | 4049 | 6/26/26 | —π | (12) | (12) |
|  |  |  |  |  |  | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;134 | $(12) | $122 |

---

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
|  | Financial Derivative Assets (000's) | Financial Derivative Assets (000's) | Financial Derivative Assets (000's) | Financial Derivative Liabilities (000's) | Financial Derivative Liabilities (000's) | Financial Derivative Liabilities (000's) | Financial Derivative Liabilities (000's) |
|  | Forward<br>Foreign<br>Currency<br>Contracts | Swaps | Total | Forward<br>Foreign<br>Currency<br>Contracts | Options | Swaps | Total |
|  Total Over the Counter Derivatives | $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;134 |  | $&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;134 | $&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;(12) |  |  | $&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;(12) |

---

**2** 

------

Mid Cap Value Portfolio

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

\* Non income producing

---

| | |
|:---|:---|
| @ | At March 31, 2026, the aggregate cost of investments, including derivatives, for federal tax purposes (in thousands) was $613,495 and the net unrealized appreciation of investments based on that cost was $28,887 which is comprised of $63,016 aggregate gross unrealized appreciation and $34,129 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.  |

---

---

| | |
|:---|:---|
| π | Amount is less than one thousand.  |

---

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 | |
| **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)* | *(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 | $— | $3019 | $— |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Consumer Discretionary | 15934 | 5869 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Consumer Staples | 28177 | 18566 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Industrials | 93318 | 18282 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Information Technology | 52818 | 6312 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; All Others | 399965 |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Other Financial Instruments^ |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Forward Foreign Currency Contracts |  | 134 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Assets: | $590212 | $52182 | $— |
|  Liabilities: |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Other Financial Instruments^ |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Forward Foreign Currency Contracts |  | (12) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Liabilities: | $— | $(12) | $— |

---

^ Other financial instruments are derivative instruments such as futures and forward foreign currency contracts, which are valued at the unrealized appreciation (depreciation) on the instrument, and securities sold short, reverse repurchase agreements, written options and swaps contracts, which are valued at market value.

**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**

## 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:** Mid Cap Value Portfolio

- **b. EDGAR series identifier (if any):** S000000053

- **c. LEI of Series:** 8TRVIGMWHSWZVXP7PI34

**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:** $660718209.32

**Total Liabilities:** $500161.02

**Net Assets:** $660218048.30

**Cash Not Reported:** $16220612.61

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000000088 | 4.27%                | 5.16%                | -6.40%               |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $5677080.42              | $22328197.82                               |
| Month 2  | $-1432804.31             | $35118720.37                               |
| Month 3  | $-4159560.56             | $-43903867.20                              |

**Designated Index Information**

- **Index Name:** Russell MidCap Value Index

- **Index Identifier:** RMCCV

### 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   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| ABM Industries Inc                           | ABM Industries Inc                           | CUSIP: 000957100<br>LEI: QF02R89VEIOROM77J447 | Long             | EC               | CORP              | US        |     11978 | NS      | $461392.56    | 0.07%             |  |  |  | No            |                  1 | On Loan: No      |
| Agree Realty Corp                            | Agree Realty Corp                            | CUSIP: 008492100<br>LEI: N/A                  | Long             | EC               |  | US        |     34380 | NS      | $2591564.40   | 0.39%             |  |  |  | No            |                  1 | On Loan: No      |
| Akamai Technologies Inc                      | Akamai Technologies Inc                      | CUSIP: 00971T101<br>LEI: OC1LZNN2LF5WTJ5RIL89 | Long             | EC               | CORP              | US        |     47602 | NS      | $5467089.70   | 0.83%             |  |  |  | No            |                  1 | On Loan: No      |
| Allstate Corp/The                            | Allstate Corp/The                            | CUSIP: 020002101<br>LEI: OBT0W1ED8G0NWVOLOJ77 | Long             | EC               | CORP              | US        |     32625 | NS      | $6764467.50   | 1.02%             |  |  |  | No            |                  1 | On Loan: No      |
| American Tower Corp                          | American Tower Corp                          | CUSIP: 03027X100<br>LEI: 5493006ORUSIL88JOE18 | Long             | EC               |  | US        |     31860 | NS      | $5498398.80   | 0.83%             |  |  |  | No            |                  1 | On Loan: No      |
| Cencora Inc                                  | Cencora Inc                                  | CUSIP: 03073E105<br>LEI: AI8GXW8LG5WK7E9UD086 | Long             | EC               | CORP              | US        |      8136 | NS      | $2555843.04   | 0.39%             |  |  |  | No            |                  1 | On Loan: No      |
| Ameriprise Financial Inc                     | Ameriprise Financial Inc                     | CUSIP: 03076C106<br>LEI: 6ZLKQF7QB6JAEKQS5388 | Long             | EC               | CORP              | US        |     10931 | NS      | $4857736.40   | 0.74%             |  |  |  | No            |                  1 | On Loan: No      |
| Baker Hughes Co                              | Baker Hughes Co                              | CUSIP: 05722G100<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    233538 | NS      | $14257494.90  | 2.16%             |  |  |  | No            |                  1 | On Loan: No      |
| Bank of New York Mellon Corp/The             | Bank of New York Mellon Corp/The             | CUSIP: 064058100<br>LEI: WFLLPEPC7FZXENRZV188 | Long             | EC               | CORP              | US        |     15177 | NS      | $1800447.51   | 0.27%             |  |  |  | No            |                  1 | On Loan: No      |
| Becton Dickinson & Co                        | Becton Dickinson & Co                        | CUSIP: 075887109<br>LEI: ICE2EP6D98PQUILVRZ91 | Long             | EC               | CORP              | US        |     60691 | NS      | $9542445.93   | 1.45%             |  |  |  | No            |                  1 | On Loan: No      |
| BorgWarner Inc                               | BorgWarner Inc                               | CUSIP: 099724106<br>LEI: 549300DSFX2IE88NSX47 | Long             | EC               | CORP              | US        |     65792 | NS      | $3569873.92   | 0.54%             |  |  |  | No            |                  1 | On Loan: No      |
| CDW Corp/DE                                  | CDW Corp/DE                                  | CUSIP: 12514G108<br>LEI: 9845001B052ABF0B6755 | Long             | EC               | CORP              | US        |     32916 | NS      | $3983494.32   | 0.60%             |  |  |  | No            |                  1 | On Loan: No      |
| CSX Corp                                     | CSX Corp                                     | CUSIP: 126408103<br>LEI: 549300JVQR4N1MMP3Q88 | Long             | EC               | CORP              | US        |    244572 | NS      | $10039680.60  | 1.52%             |  |  |  | No            |                  1 | On Loan: No      |
| Coterra Energy Inc                           | Coterra Energy Inc                           | CUSIP: 127097103<br>LEI: FCNMH6O7VWU7LHXMK351 | Long             | EC               | CORP              | US        |    128717 | NS      | $4523115.38   | 0.69%             |  |  |  | No            |                  1 | On Loan: No      |
| CareTrust REIT Inc                           | CareTrust REIT Inc                           | CUSIP: 14174T107<br>LEI: 5493001NVXE2B9GPLU96 | Long             | EC               |  | US        |     74974 | NS      | $2747797.10   | 0.42%             |  |  |  | No            |                  1 | On Loan: No      |
| Clorox Co/The                                | Clorox Co/The                                | CUSIP: 189054109<br>LEI: 54930044KVSC06Z79I06 | Long             | EC               | CORP              | US        |     20510 | NS      | $2125451.30   | 0.32%             |  |  |  | No            |                  1 | On Loan: No      |
| Cognizant Technology Solutions Corp          | Cognizant Technology Solutions Corp          | CUSIP: 192446102<br>LEI: 5493006IEVQEFQO40L83 | Long             | EC               | CORP              | US        |     92781 | NS      | $5692114.35   | 0.86%             |  |  |  | No            |                  1 | On Loan: No      |
| Colgate-Palmolive Co                         | Colgate-Palmolive Co                         | CUSIP: 194162103<br>LEI: YMEGZFW4SBUSS5BQXF88 | Long             | EC               | CORP              | US        |      7618 | NS      | $649282.14    | 0.10%             |  |  |  | No            |                  1 | On Loan: No      |
| Commerce Bancshares Inc/MO                   | Commerce Bancshares Inc/MO                   | CUSIP: 200525103<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    241318 | NS      | $11872845.60  | 1.80%             |  |  |  | No            |                  1 | On Loan: No      |
| Cummins Inc                                  | Cummins Inc                                  | CUSIP: 231021106<br>LEI: ZUNI8PYC725B6H8JU438 | Long             | EC               | CORP              | US        |      9308 | NS      | $5007890.16   | 0.76%             |  |  |  | No            |                  1 | On Loan: No      |
| Diamondback Energy Inc                       | Diamondback Energy Inc                       | CUSIP: 25278X109<br>LEI: 549300R22LSX6OHWEN64 | Long             | EC               | CORP              | US        |     41361 | NS      | $8180792.19   | 1.24%             |  |  |  | No            |                  1 | On Loan: No      |
| Dover Corp                                   | Dover Corp                                   | CUSIP: 260003108<br>LEI: 549300FMC2ALGA7N9E80 | Long             | EC               | CORP              | US        |      8865 | NS      | $1847909.25   | 0.28%             |  |  |  | No            |                  1 | On Loan: No      |
| Duke Energy Corp                             | Duke Energy Corp                             | CUSIP: 26441C204<br>LEI: I1BZKREC126H0VB1BL91 | Long             | EC               | CORP              | US        |     49271 | NS      | $6451544.74   | 0.98%             |  |  |  | No            |                  1 | On Loan: No      |
| EQT Corp                                     | EQT Corp                                     | CUSIP: 26884L109<br>LEI: 4NT01YGM4X7ZX86ISY52 | Long             | EC               | CORP              | US        |     58766 | NS      | $3739868.24   | 0.57%             |  |  |  | No            |                  1 | On Loan: No      |
| Bank of America NA                           | PURCHASED USD / SOLD JPY                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | US        |         1 | NC      | $-10124.45    | -0.00%            |  |  |  | No            |                  2 | On Loan: No      |
| Morgan Stanley & Co. International PLC       | PURCHASED USD / SOLD EUR                     | CUSIP: 000000000<br>LEI: 4PQUHN3JPFGFNF3BB653 | N/A              | DFE              |  | US        |         1 | NC      | $6722.26      | 0.00%             |  |  |  | No            |                  2 | On Loan: No      |
| Bank of America NA                           | PURCHASED USD / SOLD GBP                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | US        |         1 | NC      | $117548.36    | 0.02%             |  |  |  | No            |                  2 | On Loan: No      |
| Bank of America NA                           | PURCHASED USD / SOLD JPY                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | US        |         1 | NC      | $216.85       | 0.00%             |  |  |  | No            |                  2 | On Loan: No      |
| Bank of America NA                           | PURCHASED USD / SOLD JPY                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | US        |         1 | NC      | $-437.99      | -0.00%            |  |  |  | No            |                  2 | On Loan: No      |
| Bank of America NA                           | PURCHASED USD / SOLD JPY                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | US        |         1 | NC      | $-46.16       | -0.00%            |  |  |  | No            |                  2 | On Loan: No      |
| Bank of America NA                           | PURCHASED USD / SOLD JPY                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | US        |         1 | NC      | $-1213.83     | -0.00%            |  |  |  | No            |                  2 | On Loan: No      |
| Bank of America NA                           | PURCHASED USD / SOLD JPY                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | US        |         1 | NC      | $-1068.79     | -0.00%            |  |  |  | No            |                  2 | On Loan: No      |
| Bank of America NA                           | PURCHASED JPY / SOLD USD                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | JP        |         1 | NC      | $1100.91      | 0.00%             |  |  |  | No            |                  2 | On Loan: No      |
| Bank of America NA                           | PURCHASED GBP / SOLD USD                     | CUSIP: 000000000<br>LEI: B4TYDEB6GKMZO031MB27 | N/A              | DFE              |  | GB        |         1 | NC      | $1672.28      | 0.00%             |  |  |  | No            |                  2 | On Loan: No      |
| Morgan Stanley & Co. International PLC       | PURCHASED EUR / SOLD USD                     | CUSIP: 000000000<br>LEI: 4PQUHN3JPFGFNF3BB653 | N/A              | DFE              |  | XX        |         1 | NC      | $6693.37      | 0.00%             |  |  |  | No            |                  2 | On Loan: No      |
| Enterprise Products Partners LP              | Enterprise Products Partners LP              | CUSIP: 293792107<br>LEI: K4CDIF4M54DJZ6TB4Q48 | Long             | EC               | CORP              | US        |    252172 | NS      | $9542188.48   | 1.45%             |  |  |  | No            |                  1 | On Loan: No      |
| Envista Holdings Corp                        | Envista Holdings Corp                        | CUSIP: 29415F104<br>LEI: 549300BX623VURJZ5269 | Long             | EC               | CORP              | US        |    198378 | NS      | $5032849.86   | 0.76%             |  |  |  | No            |                  1 | On Loan: No      |
| Equity Residential                           | Equity Residential                           | CUSIP: 29476L107<br>LEI: 5493008RACSH5EP3PI59 | Long             | EC               |  | US        |    148836 | NS      | $8803649.40   | 1.33%             |  |  |  | No            |                  1 | On Loan: No      |
| Essex Property Trust Inc                     | Essex Property Trust Inc                     | CUSIP: 297178105<br>LEI: 549300TR2H2VEFX0NC60 | Long             | EC               |  | US        |      8285 | NS      | $2004970.00   | 0.30%             |  |  |  | No            |                  1 | On Loan: No      |
| Evergy Inc                                   | Evergy Inc                                   | CUSIP: 30034W106<br>LEI: 549300PGTHDQY6PSUI61 | Long             | EC               | CORP              | US        |    139011 | NS      | $11387781.12  | 1.72%             |  |  |  | No            |                  1 | On Loan: No      |
| Eversource Energy                            | Eversource Energy                            | CUSIP: 30040W108<br>LEI: SJ7XXD41SQU3ZNWUJ746 | Long             | EC               | CORP              | US        |     92660 | NS      | $6419484.80   | 0.97%             |  |  |  | No            |                  1 | On Loan: No      |
| F5 Inc                                       | F5 Inc                                       | CUSIP: 315616102<br>LEI: 54930015FPK9KT966303 | Long             | EC               | CORP              | US        |     24940 | NS      | $7215890.20   | 1.09%             |  |  |  | No            |                  1 | On Loan: No      |
| First Hawaiian Inc                           | First Hawaiian Inc                           | CUSIP: 32051X108<br>LEI: 5493002DJSH46F5OLV06 | Long             | EC               | CORP              | US        |    175202 | NS      | $4316977.28   | 0.65%             |  |  |  | No            |                  1 | On Loan: No      |
| Fortive Corp                                 | Fortive Corp                                 | CUSIP: 34959J108<br>LEI: 549300MU9YQJYHDQEF63 | Long             | EC               | CORP              | US        |     59222 | NS      | $3273792.16   | 0.50%             |  |  |  | No            |                  1 | On Loan: No      |
| GE HealthCare Technologies Inc               | GE HealthCare Technologies Inc               | CUSIP: 36266G107<br>LEI: 549300OI9J7XOWZMUN85 | Long             | EC               | CORP              | US        |    125023 | NS      | $8899137.14   | 1.35%             |  |  |  | No            |                  1 | On Loan: No      |
| Gentex Corp                                  | Gentex Corp                                  | CUSIP: 371901109<br>LEI: 549300S3UD8XV1MN0287 | Long             | EC               | CORP              | US        |    159659 | NS      | $3488549.15   | 0.53%             |  |  |  | No            |                  1 | On Loan: No      |
| HP Inc                                       | HP Inc                                       | CUSIP: 40434L105<br>LEI: WHKXQACZ14C5XRO8LW03 | Long             | EC               | CORP              | US        |    225883 | NS      | $4339212.43   | 0.66%             |  |  |  | No            |                  1 | On Loan: No      |
| Hanover Insurance Group Inc/The              | Hanover Insurance Group Inc/The              | CUSIP: 410867105<br>LEI: JJYR6MFKFF6CF8DBZ078 | Long             | EC               | CORP              | US        |     15110 | NS      | $2619318.50   | 0.40%             |  |  |  | No            |                  1 | On Loan: No      |
| Healthpeak Properties Inc                    | Healthpeak Properties Inc                    | CUSIP: 42250P103<br>LEI: 254900M6MTMZM0I22L81 | Long             | EC               |  | US        |    301227 | NS      | $4949159.61   | 0.75%             |  |  |  | No            |                  1 | On Loan: No      |
| Hexcel Corp                                  | Hexcel Corp                                  | CUSIP: 428291108<br>LEI: S6Q7LW43WUBUHXY2QP69 | Long             | EC               | CORP              | US        |     31359 | NS      | $2537883.87   | 0.38%             |  |  |  | No            |                  1 | On Loan: No      |
| Publicis Groupe SA                           | Publicis Groupe SA                           | CUSIP: 000000000<br>LEI: 2138004KW8BV57III342 | Long             | EC               | CORP              | FR        |     36501 | NS      | $3018667.48   | 0.46%             |  |  |  | No            |                  2 | On Loan: No      |
| IDEX Corp                                    | IDEX Corp                                    | CUSIP: 45167R104<br>LEI: 549300U5Y5EL6PHYLF13 | Long             | EC               | CORP              | US        |     11584 | NS      | $2195747.20   | 0.33%             |  |  |  | No            |                  1 | On Loan: No      |
| IQVIA Holdings Inc                           | IQVIA Holdings Inc                           | CUSIP: 46266C105<br>LEI: 549300W3R20NM4KQPH86 | Long             | EC               | CORP              | US        |     31521 | NS      | $5375591.34   | 0.81%             |  |  |  | No            |                  1 | On Loan: No      |
| Iron Mountain Inc                            | Iron Mountain Inc                            | CUSIP: 46284V101<br>LEI: SQL3F6CKNNBM3SQGHX24 | Long             | EC               |  | US        |     19965 | NS      | $2039225.10   | 0.31%             |  |  |  | No            |                  1 | On Loan: No      |
| Pernod Ricard SA                             | Pernod Ricard SA                             | CUSIP: 000000000<br>LEI: 52990097YFPX9J0H5D87 | Long             | EC               | CORP              | FR        |     40575 | NS      | $3028478.94   | 0.46%             |  |  |  | No            |                  2 | On Loan: No      |
| Kenvue Inc                                   | Kenvue Inc                                   | CUSIP: 49177J102<br>LEI: 5493008HSF8L4M2LIJ82 | Long             | EC               | CORP              | US        |    465839 | NS      | $8031064.36   | 1.22%             |  |  |  | No            |                  1 | On Loan: No      |
| Kimberly-Clark Corp                          | Kimberly-Clark Corp                          | CUSIP: 494368103<br>LEI: MP3J6QPYPGN75NVW2S34 | Long             | EC               | CORP              | US        |     81372 | NS      | $7849956.84   | 1.19%             |  |  |  | No            |                  1 | On Loan: No      |
| L3Harris Technologies Inc                    | L3Harris Technologies Inc                    | CUSIP: 502431109<br>LEI: 549300UTE50ZMDBG8A20 | Long             | EC               | CORP              | US        |     31532 | NS      | $10883269.80  | 1.65%             |  |  |  | No            |                  1 | On Loan: No      |
| Labcorp Holdings Inc                         | Labcorp Holdings Inc                         | CUSIP: 504922105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     42648 | NS      | $11378912.88  | 1.72%             |  |  |  | No            |                  1 | On Loan: No      |
| Henkel AG & Co KGaA                          | Henkel AG & Co KGaA                          | CUSIP: 000000000<br>LEI: 549300VZCL1HTH4O4Y49 | Long             | EC               | CORP              | DE        |     36453 | NS      | $2800780.64   | 0.42%             |  |  |  | No            |                  2 | On Loan: No      |
| MSC Industrial Direct Co Inc                 | MSC Industrial Direct Co Inc                 | CUSIP: 553530106<br>LEI: 0XVKH0LN6YGOWO2EGO17 | Long             | EC               | CORP              | US        |     99035 | NS      | $9137959.45   | 1.38%             |  |  |  | No            |                  1 | On Loan: No      |
| Marsh & McLennan Cos Inc                     | Marsh & McLennan Cos Inc                     | CUSIP: 571748102<br>LEI: 549300XMP3KDCKJXIU47 | Long             | EC               | CORP              | US        |     66112 | NS      | $11467126.40  | 1.74%             |  |  |  | No            |                  1 | On Loan: No      |
| Masco Corp                                   | Masco Corp                                   | CUSIP: 574599106<br>LEI: 5GCSNMQXHEYA1JO8QN11 | Long             | EC               | CORP              | US        |     60230 | NS      | $3636085.10   | 0.55%             |  |  |  | No            |                  1 | On Loan: No      |
| Infineon Technologies AG                     | Infineon Technologies AG                     | CUSIP: 000000000<br>LEI: TSI2PJM6EPETEQ4X1U25 | Long             | EC               | CORP              | DE        |    143649 | NS      | $6311679.68   | 0.96%             |  |  |  | No            |                  2 | On Loan: No      |
| Mohawk Industries Inc                        | Mohawk Industries Inc                        | CUSIP: 608190104<br>LEI: 549300JI1115MG3Q6322 | Long             | EC               | CORP              | US        |     31382 | NS      | $3089871.72   | 0.47%             |  |  |  | No            |                  1 | On Loan: No      |
| Mondelez International Inc                   | Mondelez International Inc                   | CUSIP: 609207105<br>LEI: 549300DV9GIB88LZ5P30 | Long             | EC               | CORP              | US        |     67722 | NS      | $3903496.08   | 0.59%             |  |  |  | No            |                  1 | On Loan: No      |
| Daikin Industries Ltd                        | Daikin Industries Ltd                        | CUSIP: 000000000<br>LEI: 549300Y7FWSTSHMW5Y57 | Long             | EC               | CORP              | JP        |     36600 | NS      | $4440160.82   | 0.67%             |  |  |  | No            |                  2 | On Loan: No      |
| Norfolk Southern Corp                        | Norfolk Southern Corp                        | CUSIP: 655844108<br>LEI: 54930036C8MWP850MI84 | Long             | EC               | CORP              | US        |     22821 | NS      | $6549627.00   | 0.99%             |  |  |  | No            |                  1 | On Loan: No      |
| Northern Trust Corp                          | Northern Trust Corp                          | CUSIP: 665859104<br>LEI: 549300GLF98S992BC502 | Long             | EC               | CORP              | US        |     64643 | NS      | $9022223.51   | 1.37%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Energy Group Inc                | Northwestern Energy Group Inc                | CUSIP: 668074305<br>LEI: 254900N1WG46G1VMDM34 | Long             | EC               | CORP              | US        |     98416 | NS      | $6489551.04   | 0.98%             |  |  |  | No            |                  1 | On Loan: No      |
| ONE Gas Inc                                  | ONE Gas Inc                                  | CUSIP: 68235P108<br>LEI: 549300HXDWI0LATTX840 | Long             | EC               | CORP              | US        |    114752 | NS      | $9883589.76   | 1.50%             |  |  |  | No            |                  1 | On Loan: No      |
| ONEOK Inc                                    | ONEOK Inc                                    | CUSIP: 682680103<br>LEI: 2T3D6M0JSY48PSZI1Q41 | Long             | EC               | CORP              | US        |     38004 | NS      | $3435181.56   | 0.52%             |  |  |  | No            |                  1 | On Loan: No      |
| Oshkosh Corp                                 | Oshkosh Corp                                 | CUSIP: 688239201<br>LEI: 549300FEKNPCFSA2B506 | Long             | EC               | CORP              | US        |     27046 | NS      | $3981441.66   | 0.60%             |  |  |  | No            |                  1 | On Loan: No      |
| Owens Corning                                | Owens Corning                                | CUSIP: 690742101<br>LEI: JO5M6676RDJIZ2U8X907 | Long             | EC               | CORP              | US        |     39789 | NS      | $4305965.58   | 0.65%             |  |  |  | No            |                  1 | On Loan: No      |
| PPG Industries Inc                           | PPG Industries Inc                           | CUSIP: 693506107<br>LEI: 549300BKPEP01R3V6C59 | Long             | EC               | CORP              | US        |     46045 | NS      | $4921289.60   | 0.75%             |  |  |  | No            |                  1 | On Loan: No      |
| PPL Corp                                     | PPL Corp                                     | CUSIP: 69351T106<br>LEI: 9N3UAJSNOUXFKQLF3V18 | Long             | EC               | CORP              | US        |    144055 | NS      | $5502901.00   | 0.83%             |  |  |  | No            |                  1 | On Loan: No      |
| PACCAR Inc                                   | PACCAR Inc                                   | CUSIP: 693718108<br>LEI: KDTEY8BWE486IKZ3CC07 | Long             | EC               | CORP              | US        |     27300 | NS      | $3153150.00   | 0.48%             |  |  |  | No            |                  1 | On Loan: No      |
| Packaging Corp of America                    | Packaging Corp of America                    | CUSIP: 695156109<br>LEI: 549300XZP8MFZFY8TJ84 | Long             | EC               | CORP              | US        |     51345 | NS      | $10896435.90  | 1.65%             |  |  |  | No            |                  1 | On Loan: No      |
| Sodexo SA                                    | Sodexo SA                                    | CUSIP: 000000000<br>LEI: 969500LCBOG12HXPYM84 | Long             | EC               | CORP              | FR        |     54895 | NS      | $2818001.51   | 0.43%             |  |  |  | No            |                  2 | On Loan: No      |
| Phillips 66                                  | Phillips 66                                  | CUSIP: 718546104<br>LEI: 5493005JBO5YSIGK1814 | Long             | EC               | CORP              | US        |     38541 | NS      | $7021399.38   | 1.06%             |  |  |  | No            |                  1 | On Loan: No      |
| T Rowe Price Group Inc                       | T Rowe Price Group Inc                       | CUSIP: 74144T108<br>LEI: 549300SIV6FPS9Y7IH33 | Long             | EC               | CORP              | US        |     46820 | NS      | $4220354.80   | 0.64%             |  |  |  | No            |                  1 | On Loan: No      |
| Prosperity Bancshares Inc                    | Prosperity Bancshares Inc                    | CUSIP: 743606105<br>LEI: N/A                  | Long             | EC               | CORP              | US        |    129981 | NS      | $8732123.58   | 1.32%             |  |  |  | No            |                  1 | On Loan: No      |
| Public Storage                               | Public Storage                               | CUSIP: 74460D109<br>LEI: 254900GLQZAD4N7N5Q19 | Long             | EC               |  | US        |     18805 | NS      | $5093898.40   | 0.77%             |  |  |  | No            |                  1 | On Loan: No      |
| PulteGroup Inc                               | PulteGroup Inc                               | CUSIP: 745867101<br>LEI: N/A                  | Long             | EC               | CORP              | US        |     49200 | NS      | $5786412.00   | 0.88%             |  |  |  | No            |                  1 | On Loan: No      |
| Quest Diagnostics Inc                        | Quest Diagnostics Inc                        | CUSIP: 74834L100<br>LEI: 8MCWUBXQ0WE04KMXBX50 | Long             | EC               | CORP              | US        |     33561 | NS      | $6577284.78   | 1.00%             |  |  |  | No            |                  1 | On Loan: No      |
| Ralliant Corp                                | Ralliant Corp                                | CUSIP: 750940108<br>LEI: 52990024QKO4DYT8N464 | Long             | EC               | CORP              | US        |     83302 | NS      | $3464530.18   | 0.52%             |  |  |  | No            |                  1 | On Loan: No      |
| Raymond James Financial Inc                  | Raymond James Financial Inc                  | CUSIP: 754730109<br>LEI: RGUZHJ05YTITL6D76949 | Long             | EC               | CORP              | US        |     19248 | NS      | $2786917.92   | 0.42%             |  |  |  | No            |                  1 | On Loan: No      |
| Realty Income Corp                           | Realty Income Corp                           | CUSIP: 756109104<br>LEI: 549300CUWDAUZSH43859 | Long             | EC               |  | US        |    153471 | NS      | $9389355.78   | 1.42%             |  |  |  | No            |                  1 | On Loan: No      |
| Regency Centers Corp                         | Regency Centers Corp                         | CUSIP: 758849103<br>LEI: 529900053A7X7FJ97S58 | Long             | EC               |  | US        |     32475 | NS      | $2457058.50   | 0.37%             |  |  |  | No            |                  1 | On Loan: No      |
| Reinsurance Group of America Inc             | Reinsurance Group of America Inc             | CUSIP: 759351604<br>LEI: LORM1GNEU1DKEW527V90 | Long             | EC               | CORP              | US        |     53150 | NS      | $10851104.00  | 1.64%             |  |  |  | No            |                  1 | On Loan: No      |
| Reliance Inc                                 | Reliance Inc                                 | CUSIP: 759509102<br>LEI: 549300E287ZOFT3C5Z56 | Long             | EC               | CORP              | US        |     16896 | NS      | $5135032.32   | 0.78%             |  |  |  | No            |                  1 | On Loan: No      |
| Republic Services Inc                        | Republic Services Inc                        | CUSIP: 760759100<br>LEI: NKNQHM6BLECKVOQP7O46 | Long             | EC               | CORP              | US        |     10581 | NS      | $2317450.62   | 0.35%             |  |  |  | No            |                  1 | On Loan: No      |
| Heineken NV                                  | Heineken NV                                  | CUSIP: 000000000<br>LEI: 724500K5PTPSST86UQ23 | Long             | EC               | CORP              | NL        |     56830 | NS      | $4373258.75   | 0.66%             |  |  |  | No            |                  2 | On Loan: No      |
| Henry Schein Inc                             | Henry Schein Inc                             | CUSIP: 806407102<br>LEI: VGO3WGL8H45T73F4RR92 | Long             | EC               | CORP              | US        |    170580 | NS      | $12571746.00  | 1.90%             |  |  |  | No            |                  1 | On Loan: No      |
| SLB Ltd                                      | SLB Ltd                                      | CUSIP: 806857108<br>LEI: 213800ZUA17OK3QLGM62 | Long             | EC               | CORP              | CW        |     94524 | NS      | $4857588.36   | 0.74%             |  |  |  | No            |                  1 | On Loan: No      |
| A O Smith Corp                               | A O Smith Corp                               | CUSIP: 831865209<br>LEI: 549300XG4US7UJNECY36 | Long             | EC               | CORP              | US        |     86055 | NS      | $5674466.70   | 0.86%             |  |  |  | No            |                  1 | On Loan: No      |
| Southwest Airlines Co                        | Southwest Airlines Co                        | CUSIP: 844741108<br>LEI: UDTZ87G0STFETI6HGH41 | Long             | EC               | CORP              | US        |     89456 | NS      | $3360861.92   | 0.51%             |  |  |  | No            |                  1 | On Loan: No      |
| Spire Inc                                    | Spire Inc                                    | CUSIP: 84857L101<br>LEI: 549300NXSY15DRY2R511 | Long             | EC               | CORP              | US        |     62342 | NS      | $5644444.68   | 0.85%             |  |  |  | No            |                  1 | On Loan: No      |
| Stanley Black & Decker Inc                   | Stanley Black & Decker Inc                   | CUSIP: 854502101<br>LEI: 549300DJ09SMTO561131 | Long             | EC               | CORP              | US        |     32693 | NS      | $2323164.58   | 0.35%             |  |  |  | No            |                  1 | On Loan: No      |
| Sysco Corp                                   | Sysco Corp                                   | CUSIP: 871829107<br>LEI: 5RGWIFLMGH3YS7KWI652 | Long             | EC               | CORP              | US        |     50062 | NS      | $3570922.46   | 0.54%             |  |  |  | No            |                  1 | On Loan: No      |
| Target Corp                                  | Target Corp                                  | CUSIP: 87612E106<br>LEI: 8WDDFXB5T1Z6J0XC1L66 | Long             | EC               | CORP              | US        |     19603 | NS      | $2375883.60   | 0.36%             |  |  |  | No            |                  1 | On Loan: No      |
| Teradyne Inc                                 | Teradyne Inc                                 | CUSIP: 880770102<br>LEI: C3X4YJ278QNZHRJULN75 | Long             | EC               | CORP              | US        |     24374 | NS      | $7225916.04   | 1.09%             |  |  |  | No            |                  1 | On Loan: No      |
| Timken Co/The                                | Timken Co/The                                | CUSIP: 887389104<br>LEI: B0I35MLPFXZSE70ASS73 | Long             | EC               | CORP              | US        |     46552 | NS      | $4681734.64   | 0.71%             |  |  |  | No            |                  1 | On Loan: No      |
| Toro Co/The                                  | Toro Co/The                                  | CUSIP: 891092108<br>LEI: YJKE4YIT6BWQHVEW0D14 | Long             | EC               | CORP              | US        |     32111 | NS      | $3000451.84   | 0.45%             |  |  |  | No            |                  1 | On Loan: No      |
| Truist Financial Corp                        | Truist Financial Corp                        | CUSIP: 89832Q109<br>LEI: 549300DRQQI75D2JP341 | Long             | EC               | CORP              | US        |    164770 | NS      | $7574476.90   | 1.15%             |  |  |  | No            |                  1 | On Loan: No      |
| US Bancorp                                   | US Bancorp                                   | CUSIP: 902973304<br>LEI: N1GZ7BBF3NP8GI976H15 | Long             | EC               | CORP              | US        |    152186 | NS      | $7915193.86   | 1.20%             |  |  |  | No            |                  1 | On Loan: No      |
| Universal Health Services Inc                | Universal Health Services Inc                | CUSIP: 913903100<br>LEI: 549300YGMGQDO0NMJD09 | Long             | EC               | CORP              | US        |     36238 | NS      | $6485514.86   | 0.98%             |  |  |  | No            |                  1 | On Loan: No      |
| Ventas Inc                                   | Ventas Inc                                   | CUSIP: 92276F100<br>LEI: ORQTRC074CWLT3DKHT41 | Long             | EC               |  | US        |     65010 | NS      | $5316517.80   | 0.81%             |  |  |  | No            |                  1 | On Loan: No      |
| VICI Properties Inc                          | VICI Properties Inc                          | CUSIP: 925652109<br>LEI: 254900RKH6RY9KCJQH63 | Long             | EC               |  | US        |    103008 | NS      | $2814178.56   | 0.43%             |  |  |  | No            |                  1 | On Loan: No      |
| Vontier Corp                                 | Vontier Corp                                 | CUSIP: 928881101<br>LEI: 549300VVSQLG4P5K4639 | Long             | EC               | CORP              | US        |     73157 | NS      | $2594878.79   | 0.39%             |  |  |  | No            |                  1 | On Loan: No      |
| Waters Corp                                  | Waters Corp                                  | CUSIP: 941848103<br>LEI: 5T547R1474YC9HOD8Q74 | Long             | EC               | CORP              | US        |     10964 | NS      | $3265079.20   | 0.49%             |  |  |  | No            |                  1 | On Loan: No      |
| Westamerica BanCorp                          | Westamerica BanCorp                          | CUSIP: 957090103<br>LEI: 984500CF4F8115C11D96 | Long             | EC               | CORP              | US        |     67797 | NS      | $3535613.55   | 0.54%             |  |  |  | No            |                  1 | On Loan: No      |
| Xcel Energy Inc                              | Xcel Energy Inc                              | CUSIP: 98389B100<br>LEI: LGJNMI9GH8XIDG5RCM61 | Long             | EC               | CORP              | US        |    141737 | NS      | $11259587.28  | 1.71%             |  |  |  | No            |                  1 | On Loan: No      |
| Zimmer Biomet Holdings Inc                   | Zimmer Biomet Holdings Inc                   | CUSIP: 98956P102<br>LEI: 2P2YLDVPES3BXQ1FRB91 | Long             | EC               | CORP              | US        |    176202 | NS      | $15932184.84  | 2.41%             |  |  |  | No            |                  1 | On Loan: No      |
| Bunzl PLC                                    | Bunzl PLC                                    | CUSIP: 000000000<br>LEI: 213800Q1Q9DV4L78UM09 | Long             | EC               | CORP              | GB        |    348950 | NS      | $10454462.37  | 1.58%             |  |  |  | No            |                  2 | On Loan: No      |
| Koninklijke Ahold Delhaize NV                | Koninklijke Ahold Delhaize NV                | CUSIP: 000000000<br>LEI: 724500C9GNBV20UYRX36 | Long             | EC               | CORP              | NL        |    149148 | NS      | $6962797.10   | 1.05%             |  |  |  | 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        |     89585 | NS      | $3050578.40   | 0.46%             |  |  |  | No            |                  2 | On Loan: No      |
| Magnum Ice Cream Co NV/The                   | Magnum Ice Cream Co NV/The                   | CUSIP: 000000000<br>LEI: 25490052LLF3XH6G9847 | Long             | EC               | CORP              | NL        |     94848 | NS      | $1399902.69   | 0.21%             |  |  |  | No            |                  2 | On Loan: No      |
| Reckitt Benckiser Group PLC                  | Reckitt Benckiser Group PLC                  | CUSIP: 000000000<br>LEI: 5493003JFSMOJG48V108 | Long             | EC               | CORP              | GB        |      8811 | NS      | $597938.00    | 0.09%             |  |  |  | No            |                  2 | On Loan: No      |
| Sunbelt Rentals Holdings Inc                 | Sunbelt Rentals Holdings Inc                 | CUSIP: 866966104<br>LEI: 529900W4BQDNMAOSRA49 | Long             | EC               | CORP              | US        |     53056 | NS      | $3388068.52   | 0.51%             |  |  |  | No            |                  2 | On Loan: No      |
| Amdocs Ltd                                   | Amdocs Ltd                                   | CUSIP: 000000000<br>LEI: 549300HQV672RJ7RQV66 | Long             | EC               | CORP              | GG        |     88789 | NS      | $5794370.14   | 0.88%             |  |  |  | No            |                  1 | On Loan: No      |
| Medtronic PLC                                | Medtronic PLC                                | CUSIP: 000000000<br>LEI: 549300GX3ZBSQWUXY261 | Long             | EC               | CORP              | IE        |     74865 | NS      | $6487052.25   | 0.98%             |  |  |  | No            |                  1 | On Loan: No      |
| Sensata Technologies Holding PLC             | Sensata Technologies Holding PLC             | CUSIP: 000000000<br>LEI: 529900MS7KFYCY9MS037 | Long             | EC               | CORP              | GB        |    129180 | NS      | $4549719.60   | 0.69%             |  |  |  | No            |                  1 | On Loan: No      |
| TE Connectivity PLC                          | TE Connectivity PLC                          | CUSIP: 000000000<br>LEI: 6367003TB6K484NFHE54 | Long             | EC               | CORP              | IE        |     11605 | NS      | $2425677.10   | 0.37%             |  |  |  | No            |                  1 | On Loan: No      |
| Willis Towers Watson PLC                     | Willis Towers Watson PLC                     | CUSIP: 000000000<br>LEI: 549300WHC56FF48KL350 | Long             | EC               | CORP              | IE        |     31335 | NS      | $9109084.50   | 1.38%             |  |  |  | No            |                  1 | On Loan: No      |
| Amrize Ltd                                   | Amrize Ltd                                   | CUSIP: 000000000<br>LEI: 529900SLCCO6K43P8146 | Long             | EC               | CORP              | CH        |     88107 | NS      | $4935754.14   | 0.75%             |  |  |  | No            |                  1 | On Loan: No      |
| NXP Semiconductors NV                        | NXP Semiconductors NV                        | CUSIP: 000000000<br>LEI: 724500M9BY5293JDF951 | Long             | EC               | CORP              | NL        |     22283 | NS      | $4386631.38   | 0.66%             |  |  |  | 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