Index 400 Stock Portfolio
NORTHWESTERN MUTUAL SERIES FUND INC
Index fund

Allocation breakdown

As of March 31, 2026 · N-PORT

By asset class

By country

By sector

By industry (SIC code)

As of March 31, 2026 · N-PORT

How we map holdings to the sectors above: each holding's issuer carries a U.S. SIC industry code in its EDGAR filer record, and each SIC code rolls up to a sector. Expand a sector to see its industries, and click a SIC code to list this fund's positions in that industry. Bonds and foreign or private issuers with no SEC filer record fall into Unclassified.

Oil & Gas Field Machinery & Equipment 1.30%
Pumps & Pumping Equipment 1.24%
Misc Industrial & Commercial Machinery & Equipment 1.05%
Water, Sewer, Pipeline, Comm & Power Line Construction 0.94%
Heavy Construction Other Than Bldg Const - Contractors 0.77%
Trucking (No Local) 0.76%
Services-Management Consulting Services 0.75%
Metalworkg Machinery & Equipment 0.74%
Ball & Roller Bearings 0.74%
Engines & Turbines 0.73%
Operative Builders 0.69%
Wholesale-Groceries & Related Products 0.64%
Special Industry Machinery (No Metalworking Machinery) 0.60%
Services-Engineering Services 0.59%
Miscellaneous Fabricated Metal Products 0.57%
General Industrial Machinery & Equipment, NEC 0.56%
Metal Cans 0.46%
Wholesale-Electrical Apparatus & Equipment, Wiring Supplies 0.42%
Wholesale-Groceries, General Line 0.42%
Guided Missiles & Space Vehicles & Parts 0.41%
Wholesale-Computers & Peripheral Equipment & Software 0.40%
Wholesale-Hardware & Plumbing & Heating Equipment & Supplies 0.40%
Wholesale-Electronic Parts & Equipment, NEC 0.39%
Transportation Services 0.38%
Services-Commercial Physical & Biological Research 0.34%
Construction - Special Trade Contractors 0.31%
Industrial & Commercial Fans & Blowers & Air Purifing Equip 0.31%
Wholesale-Machinery, Equipment & Supplies 0.31%
Construction Machinery & Equip 0.30%
Fabricated Plate Work (Boiler Shops) 0.29%
Wholesale-Durable Goods, NEC 0.29%
Lumber & Wood Products (No Furniture) 0.27%
Fabricated Structural Metal Products 0.25%
Water Transportation 0.23%
Cutlery, Handtools & General Hardware 0.22%
Farm Machinery & Equipment 0.22%
Industrial Trucks, Tractors, Trailors & Stackers 0.21%
Services-Testing Laboratories 0.21%
Refrigeration & Service Industry Machinery 0.19%
Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip 0.18%
Aircraft 0.18%
Sawmills & Planting Mills, General 0.17%
Millwood, Veneer, Plywood, & Structural Wood Members 0.15%
Aircraft Engines & Engine Parts 0.15%
Services-Educational Services 0.15%
Air Transportation, Scheduled 0.13%
Wholesale-Industrial Machinery & Equipment 0.13%
Miscellaneous Transportation Equipment 0.09%
Wholesale-Chemicals & Allied Products 0.08%
Motorcycles, Bicycles & Parts 0.07%
Metal Shipping Barrels, Drums, Kegs & Pails 0.05%
State Commercial Banks 2.98%
National Commercial Banks 2.00%
Investment Advice 1.82%
Life Insurance 1.17%
Fire, Marine & Casualty Insurance 1.14%
Security Brokers, Dealers & Flotation Companies 0.79%
Mineral Royalty Traders 0.65%
Surety Insurance 0.64%
Accident & Health Insurance 0.47%
Insurance Agents, Brokers & Service 0.45%
Title Insurance 0.37%
Patent Owners & Lessors 0.36%
Personal Credit Institutions 0.13%
Functions Related To Depository Banking, NEC 0.08%
Services-Prepackaged Software 3.56%
Semiconductors & Related Devices 2.28%
Printed Circuit Boards 1.07%
Laboratory Analytical Instruments 1.04%
Services-Computer Integrated Systems Design 0.69%
Electrical Industrial Apparatus 0.67%
Telephone & Telegraph Apparatus 0.58%
Electronic Components, NEC 0.50%
Services-Computer Programming, Data Processing, Etc. 0.34%
Miscellaneous Electrical Machinery, Equipment & Supplies 0.33%
Measuring & Controlling Devices, NEC 0.32%
Electric Lighting & Wiring Equipment 0.27%
Electronic Components & Accessories 0.13%
Services-Computer Processing & Data Preparation 0.12%
Household Appliances 0.11%
Services-Computer Programming Services 0.10%
Services-Business Services, NEC 1.55%
Retail-Eating Places 1.06%
Motor Vehicle Parts & Accessories 1.00%
Hotels & Motels 0.80%
Retail-Auto Dealers & Gasoline Stations 0.70%
Retail-Department Stores 0.63%
Retail-Variety Stores 0.57%
Services-To Dwellings & Other Buildings 0.49%
Retail-Grocery Stores 0.43%
Services-Consumer Credit Reporting, Collection Agencies 0.42%
Industrial Instruments For Measurement, Display, and Control 0.41%
Services-Auto Rental & Leasing (No Drivers) 0.33%
Retail-Family Clothing Stores 0.30%
Retail-Computer & Computer Software Stores 0.30%
Motor Vehicles & Passenger Car Bodies 0.29%
Retail-Miscellaneous Retail 0.23%
Retail-Eating & Drinking Places 0.20%
Retail-Catalog & Mail-Order Houses 0.20%
Services-Racing, Including Track Operation 0.19%
Services-Membership Sports & Recreation Clubs 0.19%
Retail-Lumber & Other Building Materials Dealers 0.17%
Totalizing Fluid Meters & Counting Devices 0.16%
Dolls & Stuffed Toys 0.14%
Services-Miscellaneous Amusement & Recreation 0.14%
Motor Homes 0.13%
Retail-Retail Stores, NEC 0.12%
Services-Amusement & Recreation Services 0.12%
Men's & Boys' Furnishgs, Work Clothg, & Allied Garments 0.10%
Sporting & Athletic Goods, NEC 0.09%
Retail-Furniture Stores 0.07%
Hotels, Rooming Houses, Camps & Other Lodging Places 0.07%
Apparel & Other Finishd Prods of Fabrics & Similar Matl 0.04%
Steel Works, Blast Furnaces & Rolling Mills (Coke Ovens) 0.83%
Plastics Products, NEC 0.81%
Steel Pipe & Tubes 0.62%
Paints, Varnishes, Lacquers, Enamels & Allied Prods 0.58%
Mining & Quarrying of Nonmetallic Minerals (No Fuels) 0.54%
Primary Production of Aluminum 0.54%
Chemicals & Allied Products 0.48%
Fabricated Rubber Products, NEC 0.43%
Rolling Drawing & Extruding of Nonferrous Metals 0.38%
Metal Mining 0.35%
Plastic Materials, Synth Resins & Nonvulcan Elastomers 0.30%
Industrial Organic Chemicals 0.28%
Abrasive, Asbestos & Misc Nonmetallic Mineral Prods 0.28%
Paperboard Containers & Boxes 0.26%
Drawing & Insulating of Nonferrous Wire 0.14%
Rubber & Plastics Footwear 0.13%
Miscellaneous Chemical Products 0.12%
Gold and Silver Ores 0.10%
Agricultural Chemicals 0.09%
Leather & Leather Products 0.07%
Tires & Inner Tubes 0.06%
Perfumes, Cosmetics & Other Toilet Preparations 0.02%
Pharmaceutical Preparations 2.79%
Biological Products, (No Diagnostic Substances) 1.19%
Surgical & Medical Instruments & Apparatus 0.70%
Services-General Medical & Surgical Hospitals, NEC 0.52%
Electromedical & Electrotherapeutic Apparatus 0.36%
Services-Skilled Nursing Care Facilities 0.36%
Services-Hospitals 0.30%
Services-Home Health Care Services 0.30%
Dental Equipment & Supplies 0.20%
Orthopedic, Prosthetic & Surgical Appliances & Supplies 0.19%
In Vitro & In Vivo Diagnostic Substances 0.16%
Services-Offices & Clinics of Doctors of Medicine 0.14%
Services-Misc Health & Allied Services, NEC 0.10%
Real Estate Investment Trusts 6.40%
Real Estate Agents & Managers (For Others) 0.45%
Electric Services 1.75%
Natural Gas Distribution 0.78%
Natural Gas Transmission 0.66%
Hazardous Waste Management 0.45%
Water Supply 0.36%
Gas & Other Services Combined 0.24%
Natural Gas Transmisison & Distribution 0.17%
Electric & Other Services Combined 0.13%
Crude Petroleum & Natural Gas 2.34%
Drilling Oil & Gas Wells 0.20%
Miscellaneous Products of Petroleum & Coal 0.13%
Petroleum Refining 0.12%
Bottled & Canned Soft Drinks & Carbonated Waters 0.52%
Grain Mill Products 0.35%
Fats & Oils 0.31%
Food and Kindred Products 0.11%
Canned, Frozen & Preservd Fruit, Veg & Food Specialties 0.09%
Poultry Slaughtering and Processing 0.05%
Malt Beverages 0.05%
Newspapers: Publishing or Publishing & Printing 0.42%
Television Broadcasting Stations 0.16%
Unclassified 10.86%

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