| Cepheid | Sunnyvale | CA | $1.25B |
| Siemens Healthcare Diagnostics Inc. | Tarrytown | NY | $899M |
| Agilent Technologies Inc.Wilmington, DE · UEI SD9JZ9S7MEA6 | Wilmington | DE | $246M |
| Illumina, Inc. | San Diego | CA | $224M |
| Biomerieux Inc. | Salt Lake City | UT | $186M |
| Sysmex America, Inc. | Lincolnshire | IL | $185M |
| Becton, Dickinson And Company | Sparks Glencoe | MD | $159M |
| Thermo Electron North America LLCWest Palm Beach, FL · UEI CMBPHDRMCS51 | West Palm Beach | FL | $158M |
| Emd Millipore Corp. | Burlington | MA | $154M |
| Hamilton Company | Reno | NV | $153M |
| Franklin Young International, Incorporated | Upland | CA | $115M |
| Ortho-clinical Diagnostics, Inc. | Raritan | NJ | $95.8M |
| Biofire Diagnostics LLC | Salt Lake City | UT | $92.6M |
| Fei Company | Hillsboro | OR | $88M |
| Barupon L. L. C. | Irvine | CA | $86.4M |
| Global Life Sciences Solutions USA LLC | Marlborough | MA | $84.3M |
| Forensic Technology (canada) Inc. | Montreal | QC | $83.2M |
| Ab Sciex LLC | Redwood City | CA | $77.7M |
| Werfen USA LLC | Bedford | MA | $76.1M |
| Waters Technologies Corporation | Milford | MA | $72.3M |
| Abbott Laboratories | Abbott Park | IL | $68.5M |
| King Nutronics Corporation | Woodland Hills | CA | $64.5M |
| Quidelortho Sales Company, LLC | San Diego | CA | $60.5M |
| D-2 Incorporated | Bourne | MA | $60.1M |
| Ortho-clinical Diagnostics Inc. | Rochester | NY | $56.8M |
| Olympus America Inc. | Waltham | MA | $54.5M |
| Jeol USA, Inc. | Peabody | MA | $50.1M |
| Revvity Health Sciences, Inc. | Hopkinton | MA | $45.5M |
| Spectro Scientific, Inc. | Chelmsford | MA | $45.4M |
| Bruker Biospin Corp. | Billerica | MA | $45M |
| Diagnostica Stago Inc. | Parsippany | NJ | $39.5M |
| Mettler-toledo Rainin, LLC | Oakland | CA | $38.2M |
| Qiagen, LLC | Germantown | MD | $37.9M |
| Bruker Scientific LLC | Billerica | MA | $36M |
| Uster Technologies, Inc. | Knoxville | TN | $35.7M |
| Beckman Coulter, Inc. | Brea | CA | $33.4M |
| Branch Medical LLC | Ridgefield | WA | $25M |
| Cameca Instruments, Inc. | Fitchburg | WI | $24.7M |
| Oxford Instruments America, Inc. | Concord | MA | $23.2M |
| Tsi Incorporated | Shoreview | MN | $23.1M |
| Planewave Instruments Inc. | Adrian | MI | $22.8M |
| Roche Molecular Systems Inc. | Branchburg | NJ | $22.6M |
| Thermo Scientific Portable Analytical Instruments Inc. | Tewksbury | MA | $21M |
| Mirion Technologies (canberra), Inc.Meriden, CT · UEI XBT6MTGBW148 | Meriden | CT | $20.3M |
| Marine Electric Systems Inc. | South Hackensack | NJ | $19.6M |
| Ta Instruments - Waters L.L.C. | Historic New Castle | DE | $19.3M |
| Viken Detection Corporation | Burlington | MA | $19M |
| Pacific Biosciences Of California, Inc. | Menlo Park | CA | $18.5M |
| Bio Rad Laboratories Inc. | Hercules | CA | $17.3M |
| Sebia, Inc. | Norcross | GA | $16.7M |
| Miltenyi Biotec, Inc. | Auburn | CA | $16.3M |
| Li-cor, Inc. | Lincoln | NE | $16.2M |
| Cytek Biosciences, Inc. | Fremont | CA | $16.2M |
| Tosoh Bioscience, Inc. | Grove City | OH | $15.9M |
| Shimadzu Scientific Instruments, Inc. | Columbia | MD | $15.2M |
| Uh-oh Labs Inc. | Santa Clara | CA | $15M |
| Toptica Photonics Inc. | Pittsford | NY | $14.8M |
| Thermo Electron North America LLCFitchburg, WI · UEI KGXJZFLXJ3H5 | Fitchburg | WI | $14M |
| Agilent Technologies Inc.Carpinteria, CA · UEI Z3FJHTRGLTC3 | Carpinteria | CA | $13.6M |
| Molecular Devices LLC | San Jose | CA | $13.3M |
| Bruker Axs LLC | Fitchburg | WI | $13.2M |
| Bio-rad Laboratories, Inc. | Hercules | CA | $13.1M |
| BNC Corp. | San Rafael | CA | $12.8M |
| Mirion Technologies (canberra), Inc.Oak Ridge, TN · UEI L6VAL8AXJXH4 | Oak Ridge | TN | $12.3M |
| Jentek Sensors, Inc. | Marlborough | MA | $11.9M |
| Oxford Nanopore Technologies, Inc. | New York | NY | $11.2M |
| Polymedco Cancer Diagnostic Products LLC | Cortlandt Manor | NY | $11M |
| Hoffman Engineering, LLC | Stamford | CT | $10.9M |
| Perkinelmer U.S. LLC | Shelton | CT | $10.6M |
| Hamilton Associates Inc. | Owings Mills | MD | $10.6M |
| Expotech U.S.A., Inc. | Houston | TX | $10.4M |
| Malvern Panalytical Inc. | Westborough | MA | $10.4M |
| Microgenics Corporation | Fremont | CA | $10.2M |
| Horiba Instruments Incorporated | Ann Arbor | MI | $10M |
| Leco Corp. | Saint Joseph | MI | $9.96M |
| Mg Scientific, Inc. | Pleasant Prairie | WI | $9.93M |
| Russells Technical Products Inc. | Holland | MI | $9.85M |
| Foster & Freeman USA Inc. | Ashburn | VA | $9.78M |
| Percival Scientific Incorporated | Perry | IA | $9.43M |
| Ortho Clinical Diagnostics K.k. | Chuo-ku | | $8.89M |
| Sony Biotechnology Inc. | San Jose | CA | $8.47M |
| Bruker Nano, Inc. | Tucson | AZ | $8.42M |
| Federal Resources Supply Company | Stevensville | MD | $8.12M |
| Cole-parmer Instrument Co. LLC | Ocala | FL | $7.87M |
| Harvard Bioscience Inc. | Saint Paul | MN | $7.81M |
| Telops Inc. | Quebec | QC | $7.75M |
| SPT Labtech Limited | Melbourn | | $7.69M |
| Laser Thermal Analysis, Inc. | Charlottesville | VA | $7.63M |
| Scienta Omicron, Inc. | Denver | CO | $7.45M |
| Stable Laser Systems Inc. | Boulder | CO | $7.43M |
| Physical Electronics USA, Inc. | Chanhassen | MN | $7.36M |
| The Ultran Group, Inc. | State College | PA | $7.14M |
| Newport Corp. | Irvine | CA | $7.14M |
| Nuaire Inc. | Minneapolis | MN | $7.08M |
| Anton Paar USA, Inc. | Ashland | VA | $7.01M |
| Nanoscience Instruments Inc. | Phoenix | AZ | $6.79M |
| Picarro, Inc. | Santa Clara | CA | $6.72M |
| Laser Techniques Company, LLC | Redmond | WA | $6.66M |
| Daylight Defense, LLC | San Diego | CA | $6.4M |
| Lafayette Instrument Company, LLC | Lafayette | IN | $6.11M |
