# Mid Cap Growth Stock Portfolio

Mid Cap Growth Stock Portfolio is a registered fund series of NORTHWESTERN MUTUAL SERIES FUND INC (series S000000050). Net assets $959.5M as of 2026-03-31.

## Profile

- Series ID: S000000050
- Registrant: NORTHWESTERN MUTUAL SERIES FUND INC
- LEI: LIP0ME8UWTR611J45283
- Net assets: $959.5M
- Total assets: $960.0M
- As of: 2026-03-31

## Advisers

- [J.P. Morgan Investment Management Inc. (Subadvisor)](https://search.stillhousedata.com/firm/107038)
- [Mason Street Advisors, LLC (Advisor)](https://search.stillhousedata.com/firm/114085)

## Top holdings (109 reported)

_Showing 15 of 109 holdings by value._

| Holding | Ticker | Value | % of fund |
| --- | --- | --- | --- |
| [Howmet Aerospace Inc](https://search.stillhousedata.com/security/443201108) | — | $33.3M | 347.11% |
| [Hilton Worldwide Holdings Inc](https://search.stillhousedata.com/security/43300A203) | — | $32.9M | 343.23% |
| [Vertiv Holdings Co](https://search.stillhousedata.com/security/92537N108) | — | $32.3M | 337.05% |
| Royal Caribbean Cruises Ltd | — | $29.9M | 311.61% |
| [Quanta Services Inc](https://search.stillhousedata.com/security/74762E102) | — | $27.9M | 290.46% |
| [Comfort Systems USA Inc](https://search.stillhousedata.com/security/199908104) | — | $24.6M | 256.39% |
| [Cencora Inc](https://search.stillhousedata.com/security/03073E105) | — | $24.0M | 249.79% |
| [Insmed Inc](https://search.stillhousedata.com/security/457669307) | — | $21.5M | 224.40% |
| [Cloudflare Inc](https://search.stillhousedata.com/security/18915M107) | — | $21.4M | 222.94% |
| [Alnylam Pharmaceuticals Inc](https://search.stillhousedata.com/security/02043Q107) | — | $19.7M | 205.35% |
| [Cheniere Energy Inc](https://search.stillhousedata.com/security/16411R208) | — | $16.9M | 175.93% |
| [Carvana Co](https://search.stillhousedata.com/security/146869102) | — | $16.8M | 175.03% |
| [Burlington Stores Inc](https://search.stillhousedata.com/security/122017106) | — | $15.2M | 158.69% |
| [Natera Inc](https://search.stillhousedata.com/security/632307104) | — | $14.4M | 149.61% |
| [Neurocrine Biosciences Inc](https://search.stillhousedata.com/security/64125C109) | — | $13.4M | 139.84% |

## Net asset history

| Report date | Net assets |
| --- | --- |
| 2026-03-31 | $959.5M |
| 2025-12-31 | $1.0B |
| 2025-09-30 | $1.1B |
| 2025-06-30 | $1.1B |
| 2025-03-31 | $915.3M |
| 2024-12-31 | $1.0B |
| 2024-09-30 | $1.0B |
| 2024-06-30 | $1.0B |

## 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/S000000050.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

---

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.