| S&G Enterprises Inc. | Germantown |
Racine | |
| S2 Technologies LLC | Milwaukee |
| Saeger Enterprises | Wisconsin Rapids |
 | Injects water, oxygen and plant food three to eight inches deep in three to thirty seconds, no evaporation. Eleven self-cleaning claws remove weeds. No crawling or kneeling. |
| SafeNet Consulting, Inc. | Milwaukee |
| Safway Steel Products, Inc. | Waukesha |
| SAGA-Design | Cedarburg |
| Sales & Marketing Associates | Germantown |
| Sales Automation Support, Inc. | Milwaukee |
| Salvaggio Custom Finishes, Inc. | Cedarburg |
| Sandberg Scott & Associates | Milwaukee |
| SAS Insurance Tech | Janesville |
| SASI | Milwaukee |
| Sattell, Johnson, Appel, & Co., S.C | Milwaukee |
| SBC | Chicago, IL |
| Scag Power Equipment | Mayfield |
| Scan-Pac | Mequon |
| Scheibel Halaska | Milwaukee |
| Schenck Business Solutions | Appleton |
| Schmidt Engineering & Equiptment, Inc. | New Berlin |
| Schneider Specialized Carriers, Inc. | Green Bay |
| Schulers Fine Furniture | Janesville Bay |
| Schwaab, Inc. | Milwaukee |
| The Schmitz Company | Shorewood |
| Scientific Instruments, Inc. | Milwaukee |
| Scientific Molding Corp. Ltd. | Somerset |
| Scot Industries, Inc. | East Troy |
| Seagrave | Clintonville |
| SECOR International, Inc. | Milwaukee |
| Security Personnel, Inc. (SPI) | Milwaukee |
| Select Technical Staffing Inc. | West Allis |
| Sensient Technologies Co | Milwaukee |
| Sentinel Printing & Binding Co. | New Berlin |
| Sentry Equipment Corp. | Oconomowoc |
| Sequence, Inc. | Milwaukee |
| Serigraph Inc. | West Bend |
| Server Products | Richfield |
| Services Plus, Inc. | Green Bay |
| S-F Analytica Laboratories, Inc. | Milwaukee |
| Shaw Building & Design, Inc. | Stoughton |
| The Shaw Company, Inc. | Madison |
| Sheffield Automation | Fond du Lac |
| The Shop Consulting | |
| Shopko Stores Inc. | Green Bay |
| Shoreline Real Estate Co. | Milwaukee |
| Siegel-Gallagher | Milwaukee |
| Sierra Inc. | Sierra |
| Sign Studio & Print Shop | Phillips |
| Signs Incorporated | Oak Creek |
| Sileno Companies | Milwaukee |
| Simplex Scientific | Middleton |
| Simplicity Manufacturing, Inc. | Port Washington |
| Slinger Mfg. Co., Inc. | Slinger |
| Slumberland Furniture | Madison |
| Small Business Times | Milwaukee |
| Small Bytes, Inc. (SBI) | Cambridge |
| Smart Studios | Madison |
| SMC Metal Fabricators | Oshkosh |
| Smith (A.O.) Corp | Milwaukee |
| Smith & Gesteland LLP | Madison |
| Smith & Nephew | Germantown |
| Smyth Inland Allianc | Oshkosh |
| SNC Manufacturing Company., Inc. | Oshkosh |
| Software Configuration Solutions, Inc. | Brokfield |
| Soliton Incorporated | Big Bend |
| Sonic Foundry Inc | Madison |
| Soucie & Associates | |
| Spacesaver | Fort Atkinson |
| Spano Pratt | Milwaukee |
| Specialty Packaging Group, Inc. | Wausau |
| Spectrum Consulting | Milwaukee |
| Spectrum Digital Services | Hartland |
| Spectrum Industries, Inc. | Chippewa Falls |
| Speedy Pro | Milwaukee |
| Spherion | Milwaukee |
| SPI Inc. | Mequon |
| Spic and Span, Inc. | Milwaukee |
| Spin Group, Inc. | Milwaukee |
| Spinweld, Inc. | Milwaukee |
| Sprecher Bertalot & Company | Milwaukee |
| Sprint E-Solutions | Milwaukee |
| Sprint PCS | Milwaukee |
| St. Francis Capital Corp | Brookfield |
| Staff Development | Milwaukee |
| Staff One, Ltd. | Milwaukee |
| Staffworks Staffing Services | Milwaukee |
| Stainless Foundry & Engineering, Inc. | Milwaukee |
| Stainless Specialists Inc. | Wausau |
| Stamm Business Technologies | Milwaukee |
| Standard Networks | Madison |
| StandFire Networks, Inc. | Milwaukee |
| Stanley Steemer International, Inc | New Berlin |
| Stapleton Resources, LLC | Waukesha | |
| Sta-Rite Industries, Inc., A Wicor Co. | Waterford |
| The Stark Company | Madison |
| Stark Images | Milwaukee |
| State Financial Services Corp | Milwaukee |
| Stateside Associates | Arlington |
| Steele Solutions, Inc. | Waukesha |
| Steeno Consulting Inc. | Elm Grove |
| Steff Advertising, Inc. | Wauwatosa |
| Stella Foods Inc. | Fond Du Lac |
| Stephan & Brady, Inc. | Madison |
| Sterling Concepts, Inc. | Madison |
| Sterling Handling Equipment Inc. | Milwaukee |
| Stevens & Kroening LLC | Brookfield |
| Stifel Nicolaus & Co. Inc. | Brookfield |
| Stoelting, Inc. | Kiel |
| Stora Enso Oyj | Wisconsin Rapids |
| storeWALL Office Applications | Milwaukee |
| Stowell Associates and SelectStaff, Inc. | Milwaukee |
| Strategic Management Associates, LLC | Fox Point |
| Strattec Security Corporation | Milwaukee |
| Streamex Technologies | Milwaukee |
| Street Cance Marketing Communications | Milwaukee |
| Strong Financial | Menomonee |
| Strong Interactive Media | Thiensville |
| Structural Sysems Corporation | Brookfield |
| STS Consultants | Milwaukee |
| Subatomic Web L.L.C. | Madison |
| Summit Credit Union | Madison |
| Sun Tzu Security, Ltd. | Milwaukee |
| Sundial Small Business Services | Madison |
| Sundial Software Corporation | Madison |
| Sunrise Medical, Inc., Continuing Care Group (CCG) | Stevens Point |
| Sunset Investors | Franklin |
| Super Steel Products Corp. | Milwaukee |
| Superior Automation | Phillips |
| Superior Support Resources, Inc. | Brookfield |
| Supranet Communications, Inc. | Madison |
| Sussex Plastics, Inc. | Sussex |
| Suttle Straus | Waunakee |
| Symet, Inc. | Milwaukee |
| Symphony Corporation | Madison |
| (Consulting) | |
| Syndesis Corporation | Jefferson |
| Synergy Advantage Plus | Mequon |
