# EDGAR Filing Document

**Accession Number:** 0000742212
**File Stem:** 0001752724-23-042295
**Filing Date:** 2023-2
**Character Count:** 12992
**Document Hash:** 5d8db306929944b9eac5d9b8e572b1d4
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001752724-23-042295.hdr.sgml**: 20230227

**ACCESSION NUMBER**: 0001752724-23-042295

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20221231

**FILED AS OF DATE**: 20230227

**DATE AS OF CHANGE**: 20230227

**PERIOD START**: 20221231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NORTHWESTERN MUTUAL SERIES FUND INC
- **CENTRAL INDEX KEY:** 0000742212
- **IRS NUMBER:** 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:** 23672546

**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

### Balanced Portfolio (Series ID: S000000045)

| Class ID   | Class Name         | Ticker Symbol   |
|:---|:---|:---|
| C000000080 | Balanced Portfolio |  |

## 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:** Balanced Portfolio

- **b. EDGAR series identifier (if any):** S000000045

- **c. LEI of Series:** 4F2ZSMZDZU02NP7J8L64

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

- **a. Date of fiscal year-end:** 2022-12-31

- **b. Date as of which information is reported:** 2022-12-31

**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:** $1883796597.39

**Total Liabilities:** $118435.04

**Net Assets:** $1883678162.35

**Cash Not Reported:** $14051503.33

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000000080 | 3.62%                | 5.54%                | -2.42%               |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-8169101.88             | $74205416.69                               |
| Month 2  | $831426.78               | $100064107.64                              |
| Month 3  | $-379452.21              | $-48085730.83                              |

### 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   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| JPMorgan Ultra-Short Income ETF                                           | JPMorgan Ultra-Short Income ETF                                           | CUSIP: 46641Q837<br>LEI: 549300VN24B8TQAGGX74 | Long             | EC               | RF                | US        |    452950 | NS      | $22706383.50  | 1.21%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - International Growth Portfolio    | Northwestern Mutual Series Fund, Inc. - International Growth Portfolio    | CUSIP: 668140684<br>LEI: A7EFFZCFPQNSS1P3HZ68 | Long             | EC               | RF                | US        |  46675755 | NS      | $75894777.64  | 4.03%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Domestic Equity Portfolio         | Northwestern Mutual Series Fund, Inc. - Domestic Equity Portfolio         | CUSIP: 668140791<br>LEI: 5493004TKKI7X6F71K84 | Long             | EC               | RF                | US        |  65934589 | NS      | $107539314.95 | 5.71%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Focused Appreciation Portfolio    | Northwestern Mutual Series Fund, Inc. - Focused Appreciation Portfolio    | CUSIP: 668140775<br>LEI: 5493007QO6Z6UMWHLZ04 | Long             | EC               | RF                | US        |  34966919 | NS      | $95214919.78  | 5.05%             |  |  |  | No            |                  1 | On Loan: No      |
| iShares Core U.S. Aggregate Bond ETF                                      | iShares Core U.S. Aggregate Bond ETF                                      | CUSIP: 464287226<br>LEI: 549300F7VSXTKBGHJE47 | Long             | EC               | RF                | US        |    469400 | NS      | $45527106.00  | 2.42%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Select Bond Portfolio             | Northwestern Mutual Series Fund, Inc. - Select Bond Portfolio             | CUSIP: 668140759<br>LEI: 03DZ35VFRGD62UKLL347 | Long             | EC               | RF                | US        | 615942790 | NS      | $657826900.16 | 34.92%            |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Multi-Sector Bond Portfolio       | PIMCO MULTI SECTOR BD PORT MUTUAL FUND                                    | CUSIP: 668140882<br>LEI: P0C14V6IL3O47L1ZG636 | Long             | EC               | RF                | US        | 111382309 | NS      | $101469283.06 | 5.39%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - International Equity Portfolio    | Northwestern Mutual Series Fund, Inc. - International Equity Portfolio    | CUSIP: 668140692<br>LEI: 5493009J2EF7GK480170 | Long             | EC               | RF                | US        |  57893025 | NS      | $81108128.29  | 4.31%             |  |  |  | No            |                  1 | On Loan: No      |
| PIMCO Enhanced Short Maturity Active Exchange-Traded Fund                 | PIMCO Enhanced Short Maturity Active Exchange-Traded Fund                 | CUSIP: 72201R833<br>LEI: VOYE9Z80GB9431LFS645 | Long             | EC               | RF                | US        |    225400 | NS      | $22235710.00  | 1.18%             |  |  |  | No            |                  1 | On Loan: No      |
| iShares Core S&P Small-Cap ETF                                            | iShares Core S&P Small-Cap ETF                                            | CUSIP: 464287804<br>LEI: 549300BZQ17QYN750B25 | Long             | EC               | RF                | US        |    121900 | NS      | $11536616.00  | 0.61%             |  |  |  | No            |                  1 | On Loan: No      |
| iShares Russell 2000 ETF                                                  | iShares Russell 2000 ETF                                                  | CUSIP: 464287655<br>LEI: 549300O80OAR5VTWR172 | Long             | EC               | RF                | US        |     64400 | NS      | $11228784.00  | 0.60%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - High Yield Bond Portfolio         | Northwestern Mutual Series Fund, Inc. - High Yield Bond Portfolio         | CUSIP: 668140742<br>LEI: KUVC5M5XHVXDKYES4T32 | Long             | EC               | RF                | US        |  91004305 | NS      | $57059699.13  | 3.03%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Short-Term Bond Portfolio.        | Northwestern Mutual Series Fund, Inc. - Short-Term Bond Portfolio.        | CUSIP: 668140601<br>LEI: BEEDB5U9NNUVQYFFEL15 | Long             | EC               | RF                | US        |  23056020 | NS      | $22825460.27  | 1.21%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Mid Cap Value Portfolio           | Northwestern Mutual Series Fund, Inc. - Mid Cap Value Portfolio           | CUSIP: 668140783<br>LEI: 8TRVIGMWHSWZVXP7PI34 | Long             | EC               | RF                | US        |  55710279 | NS      | $91364856.87  | 4.85%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Emerging Markets Equity Portfolio | Northwestern Mutual Series Fund, Inc. - Emerging Markets Equity Portfolio | CUSIP: 668140502<br>LEI: 549300B2SFS01R9MCJ10 | Long             | EC               | RF                | US        |  14608062 | NS      | $13059606.98  | 0.69%             |  |  |  | No            |                  1 | On Loan: No      |
| iShares Core MSCI EAFE ETF                                                | iShares Core MSCI EAFE ETF                                                | CUSIP: 46432F842<br>LEI: 5493009FT582MI7Y3I36 | Long             | EC               | RF                | US        |    713300 | NS      | $43967812.00  | 2.33%             |  |  |  | No            |                  1 | On Loan: No      |
| iShares Core MSCI Emerging Markets ETF                                    | iShares Core MSCI Emerging Markets ETF                                    | CUSIP: 46434G103<br>LEI: 5493007C24Z3ZDJ0VD06 | Long             | EC               | RF                | US        |    124900 | NS      | $5832830.00   | 0.31%             |  |  |  | No            |                  1 | On Loan: No      |
| iShares Core S&P Mid-Cap ETF                                              | iShares Core S&P Mid-Cap ETF                                              | CUSIP: 464287507<br>LEI: 549300ODQWH5PC0IUZ78 | Long             | EC               | RF                | US        |     31050 | NS      | $7510684.50   | 0.40%             |  |  |  | No            |                  1 | On Loan: No      |
| iShares Core S&P 500 ETF                                                  | iShares Core S&P 500 ETF                                                  | CUSIP: 464287200<br>LEI: 5493007M4YMN8XL48C14 | Long             | EC               | RF                | US        |    452500 | NS      | $173855025.00 | 9.23%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Small Cap Value Portfolio         | Northwestern Mutual Series Fund, Inc. - Small Cap Value Portfolio         | CUSIP: 668140817<br>LEI: 5493006BEZYY47A02J59 | Long             | EC               | RF                | US        |  12656070 | NS      | $22920142.53  | 1.22%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Small Cap Growth Stock Portfolio  | Northwestern Mutual Series Fund, Inc. - Small Cap Growth Stock Portfolio  | CUSIP: 668140825<br>LEI: YTR2S467AP5XPLF6CQ13 | Long             | EC               | RF                | US        |   8954100 | NS      | $16959066.24  | 0.90%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Large Cap Blend Portfolio         | Northwestern Mutual Series Fund, Inc. - Large Cap Blend Portfolio         | CUSIP: 668140205<br>LEI: 549300J8IDGQV6XROU84 | Long             | EC               | RF                | US        |  92540637 | NS      | $100036428.45 | 5.31%             |  |  |  | No            |                  1 | On Loan: No      |
| Northwestern Mutual Series Fund, Inc. - Mid Cap Growth Stock Portfolio    | Northwestern Mutual Series Fund, Inc. - Mid Cap Growth Stock Portfolio    | CUSIP: 668140866<br>LEI: LIP0ME8UWTR611J45283 | Long             | EC               | RF                | US        |  30195138 | NS      | $81889214.04  | 4.35%             |  |  |  | No            |                  1 | On Loan: No      |

### Signature

**Date Signed:** 2023-01-25

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

**Signature:** Phillip Rinzel

**Name of Signer:** Phillip Rinzel

**Title:** Controller and Chief Accounting Officer