# Index 500 Stock Portfolio

Index 500 Stock Portfolio is a registered fund series of NORTHWESTERN MUTUAL SERIES FUND INC (series S000000043). Net assets $7.1B as of 2026-03-31. Index fund.

## Profile

- Series ID: S000000043
- Registrant: NORTHWESTERN MUTUAL SERIES FUND INC
- LEI: JQ44ZQUCMUGK6WUCGP28
- Net assets: $7.1B
- Total assets: $7.1B
- As of: 2026-03-31
- Type: Index

## Advisers

- [BlackRock Advisors, LLC (Subadvisor)](https://search.stillhousedata.com/firm/106614)
- [Mason Street Advisors, LLC (Advisor)](https://search.stillhousedata.com/firm/114085)

## Top holdings (200 reported)

_Showing 15 of 200 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [NVIDIA Corp](https://search.stillhousedata.com/security/67066G104) | — | $536.7M | 754.19% |
| [Apple Inc](https://search.stillhousedata.com/security/037833100) | — | $471.9M | 663.07% |
| [Microsoft Corp](https://search.stillhousedata.com/security/594918104) | — | $348.1M | 489.17% |
| [Amazon.com Inc](https://search.stillhousedata.com/security/023135106) | — | $257.5M | 361.85% |
| [Alphabet Inc](https://search.stillhousedata.com/security/02079K305) | — | $212.0M | 297.94% |
| [Broadcom Inc](https://search.stillhousedata.com/security/11135F101) | — | $185.8M | 261.04% |
| [Alphabet Inc](https://search.stillhousedata.com/security/02079K107) | — | $169.9M | 238.74% |
| [Meta Platforms Inc](https://search.stillhousedata.com/security/30303M102) | — | $158.4M | 222.54% |
| [Tesla Inc](https://search.stillhousedata.com/security/88160R101) | — | $132.4M | 186.06% |
| [Berkshire Hathaway Inc](https://search.stillhousedata.com/security/084670702) | — | $111.3M | 156.38% |
| [JPMorgan Chase & Co](https://search.stillhousedata.com/security/46625H100) | — | $100.4M | 141.14% |
| [Eli Lilly & Co](https://search.stillhousedata.com/security/532457108) | — | $92.3M | 129.71% |
| [Exxon Mobil Corp](https://search.stillhousedata.com/security/30231G102) | — | $89.8M | 126.18% |
| [Johnson & Johnson](https://search.stillhousedata.com/security/478160104) | — | $74.6M | 104.83% |
| [Walmart Inc](https://search.stillhousedata.com/security/931142103) | — | $69.0M | 96.95% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $7.1B |
| 2025-12-31 | $7.5B |
| 2025-09-30 | $7.4B |
| 2025-06-30 | $6.9B |
| 2025-03-31 | $6.2B |
| 2024-12-31 | $6.6B |
| 2024-09-30 | $6.5B |
| 2024-06-30 | $6.2B |

## More

- [Registrant: NORTHWESTERN MUTUAL SERIES FUND INC](https://search.stillhousedata.com/registrant/742212)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/fund/S000000043.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.