| U.P. Rehab Services, LLC | MI | 107 | 54.2% |
| U.S. BANK NATIONAL ASSOCIATION | MN | 2,975 | 95.6% |
| U.S. Well Services, LLC | TX | 10 | 90.0% |
| U.S.D. 501, Topeka Public Schools | KS | 77 | 83.1% |
| Uber Technologies, Inc. | CA | 6,546 | 93.7% |
| UBS AG | TN | 308 | 77.0% |
| UBS Business Solutions US LLC | TN | 1,788 | 95.6% |
| UBS Securities LLC | TN | 1,272 | 78.8% |
| UChicago Argonne LLC | IL | 1,275 | 83.8% |
| UCI GROUP OF HEALTH CARE SERVICES | FL | 97 | 99.0% |
| UCSF MEDICAL CENTER | CA | 1,073 | 84.0% |
| Udemy, Inc. | CA | 167 | 91.6% |
| UHCP D/B/A UPMC MEDICAL EDUCATION | PA | 600 | 91.5% |
| UHY ADVISORS NY, INC. | NY | 53 | 73.6% |
| Uktha Global, Inc | GA | 359 | 88.0% |
| ULTIMATE CARE INC. | FL | 614 | 94.1% |
| UMass Chan Medical School | MA | 1 | 100.0% |
| UMass Memorial Medical Group, Inc. | MA | 276 | 93.8% |
| UMB Bank NA | MO | 122 | 93.4% |
| UNICON International, Inc. | OH | 148 | 97.3% |
| Unicon Pharma Inc | NJ | 658 | 76.3% |
| UNICORN TECHNOLOGIES, LLC | GA | 784 | 80.7% |
| UNIFIED BUSINESS TECHNOLOGIES, INC | MI | 232 | 92.2% |
| Unified School District 457 | KS | 113 | 96.5% |
| Unified School District No 259 Sedgwick County KS | KS | 82 | 93.9% |
| UNIFY SOLUTIONS INC | MD | 1,258 | 82.7% |
| UNIKON IT INC | TX | 462 | 85.3% |
| Union Hospital, Inc. | IN | 54 | 83.3% |
| Union Pacific Railroad Company | NE | 242 | 91.7% |
| Union Underwear Company, Inc. | KY | 78 | 79.5% |
| UNIQUE KEY RESOURCES INC | TN | 419 | 95.9% |
| Unique Services Associates, Inc. | AR | 112 | 89.3% |
| Unique System Skills LLC | NH | 116 | 94.0% |
| uniQure, Inc. | MA | 43 | 90.7% |
| United Airlines, Inc. | IL | 312 | 82.4% |
| UNITED CEREBRAL PALSY ASSOCIATIONS OF NYS, INC. | NY | 127 | 89.0% |
| United Health Centers of the San Joaquin Valley | CA | 71 | 77.5% |
| United Health Services Hospitals, Inc. | NY | 251 | 77.7% |
| United HealthCare Services, Inc. | MN | 1,001 | 94.9% |
| United Hospital Center, Inc. | WV | 44 | 90.9% |
| UNITED METHODIST HOMES AND SERVICES | IL | 143 | 69.9% |
| United Parcel Service General Services Co. | GA | 262 | 94.7% |
| UNITED PHARMA TECHNOLOGIES, INC. | NJ | 328 | 90.5% |
| United Rehab Solutions LLC | MI | 63 | 87.3% |
| United Services Automobile Association | TX | 531 | 98.1% |
| United Software Group, Inc. | OH | 1,206 | 71.3% |
| United Solutions, LLC | MD | 495 | 83.2% |
| United States Steel Corporation | PA | 107 | 98.1% |
| United States Technologies Communications Corporation | NJ | 1 | 100.0% |
| United Supermarkets, LLC | TX | 43 | 79.1% |
| United Tech Systems Inc | GA | 236 | 95.3% |
| United Wholesale Mortgage, LLC | MI | 329 | 94.2% |
| Unity Health Network LLC | OH | 42 | 90.5% |
| Unity Hospital | NY | 96 | 96.9% |
| UniUni Logistics Inc | CA | 50 | 100.0% |
| UniValue Creations, LLC | HI | 36 | 91.7% |
| Universal City Studios Productions LLLP | NY | 34 | 97.1% |
| Universal Medical Record Services Corporation | NY | 113 | 95.6% |
| Universal Processing, LLC | NY | 127 | 91.3% |
| Universal Rehab Services, Inc. | TN | 82 | 79.3% |
| Universal Service Administrative Company | DC | 99 | 97.0% |
| Universidad Central del Caribe, Inc. | PR | 21 | 81.0% |
| Universidad Interamericana de Puerto Rico | PR | 23 | 91.3% |
| University at Buffalo Pediatric Associates, Inc. | NY | 52 | 92.3% |
| University Community Hospital, Inc. | FL | 206 | 97.1% |
| University Corporation for Atmospheric Research | CO | 438 | 63.2% |
| University Health Physicians | MO | 141 | 94.3% |
| University Hospitals Cleveland Medical Center | OH | 323 | 91.3% |
| University Hospitals Medical Group, Inc. | OH | 326 | 93.9% |
| University Medical Center, Inc. | KY | 49 | 89.8% |
| University of Alabama Health Services Foundation, PC | AL | 364 | 64.0% |
| University of Alaska | AK | 366 | 63.9% |
| University of Arizona | AZ | 1,948 | 68.6% |
| University of Arkansas | AR | 751 | 77.2% |
| University of Arkansas for Medical Sciences | AR | 1,634 | 91.0% |
| University of California at Santa Barbara | CA | 945 | 77.9% |
| University of California, Berkeley | CA | 2,008 | 85.3% |
| University of California, Davis | CA | 2,775 | 70.9% |
| University of California, Irvine | CA | 1,113 | 73.2% |
| University of California, Los Angeles | CA | 2,685 | 83.4% |
| UNIVERSITY OF CALIFORNIA, MERCED | CA | 155 | 88.4% |
| University of California, Riverside | CA | 229 | 76.9% |
| UNIVERSITY OF CALIFORNIA, SAN DIEGO | CA | 2,929 | 68.9% |
| University of California, Santa Cruz | CA | 427 | 72.1% |
| UNIVERSITY OF CENTRAL FLORIDA | FL | 672 | 83.8% |
| University of Central Missouri | MO | 116 | 88.8% |
| University of Central Oklahoma | OK | 89 | 87.6% |
| University of Chicago Medical Center | IL | 359 | 93.3% |
| UNIVERSITY OF CINCINNATI | OH | 858 | 90.1% |
| UNIVERSITY OF CINCINNATI MEDICAL CENTER, LLC | OH | 87 | 98.8% |
| University of Cincinnati Physicians, Inc. | OH | 53 | 84.9% |
| University of Colorado | CO | 3,596 | 65.8% |
| University of Connecticut | CT | 1,245 | 78.2% |
| University of Connecticut Health Center | CT | 508 | 75.8% |
| UNIVERSITY OF DELAWARE | DE | 701 | 69.8% |
| University of Detroit Mercy | MI | 159 | 89.9% |
| UNIVERSITY OF FLORIDA | FL | 3,460 | 79.0% |
| University of Georgia; OGE | GA | 440 | 70.9% |
| University of Guam | GU | 87 | 92.0% |
| University of Hawaii | HI | 1,011 | 74.2% |
| University of Houston | TX | 1,736 | 71.2% |
| University of Idaho | ID | 311 | 90.0% |
| UNIVERSITY OF KENTUCKY | KY | 1,608 | 84.7% |
| University of Louisiana at Lafayette | LA | 246 | 98.8% |
| University of Louisville | KY | 769 | 87.8% |
| UNIVERSITY OF LOUISVILLE PHYSICIANS, INC. | KY | 80 | 92.5% |
| University of Maine | ME | 289 | 93.4% |
| University of Maryland Baltimore | MD | 2,880 | 70.5% |
| UNIVERSITY OF MARYLAND COLLEGE PARK | MD | 2,081 | 73.4% |
| University of Massachusetts Amherst | MA | 1,107 | 80.1% |
| University of Massachusetts Dartmouth | MA | 732 | 66.4% |
| UNIVERSITY OF MASSACHUSETTS LOWELL | MA | 204 | 92.7% |
| University of Massachusetts Medical School | MA | 1,292 | 68.9% |
| UNIVERSITY OF MIAMI | FL | 1,144 | 87.6% |
| University of Michigan | MI | 7,273 | 69.6% |
| UNIVERSITY OF MINNESOTA | MN | 2,334 | 94.1% |
| University of Minnesota Physicians | MN | 187 | 93.6% |
| University of Mississippi | MS | 584 | 74.3% |
| University of Mississippi Medical Center | MS | 797 | 77.3% |
| University of Nebraska at Omaha | NE | 183 | 88.0% |
| University of Nebraska Medical Center | NE | 856 | 93.8% |
| University of Nevada, Reno | NV | 991 | 85.7% |
| University of New Hampshire | NH | 398 | 75.6% |
| University of New Haven | CT | 118 | 78.8% |
| University of New Mexico | NM | 513 | 92.0% |
| UNIVERSITY OF NEW MEXICO HEALTH SCIENCES CENTER | NM | 207 | 91.3% |
| University of New Orleans | LA | 111 | 82.9% |
| UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL | NC | 2,034 | 69.0% |
| University of North Carolina at Charlotte | NC | 385 | 73.3% |
| University of North Carolina Wilmington | NC | 159 | 81.8% |
| University of North Dakota | ND | 414 | 93.5% |
| UNIVERSITY OF NORTH FLORIDA | FL | 133 | 78.2% |
| UNIVERSITY OF NORTH GEORGIA | GA | 155 | 89.7% |
| UNIVERSITY OF NORTH TEXAS | TX | 539 | 64.2% |
| University of North Texas Health Science Center | TX | 315 | 64.8% |
| University of Northern Iowa | IA | 143 | 83.2% |
| University of Notre Dame du Lac | IN | 991 | 80.2% |
| University of Oklahoma | OK | 1,250 | 92.4% |
| University of Oklahoma Health Sciences Center | OK | 745 | 89.7% |
| University of Oregon | OR | 749 | 73.8% |
| University of Phoenix, an Apollo Education Group, Inc. company | AZ | 355 | 76.3% |
| University of Pittsburgh | PA | 3,617 | 82.1% |
| University of Pittsburgh Physicians | PA | 1,308 | 80.2% |
| UNIVERSITY OF PUERTO RICO AT CAYEY | PR | 31 | 77.4% |
| UNIVERSITY OF PUERTO RICO-Mayaguez Campus | PR | 87 | 74.7% |
| University of Puerto Rico-Medical Science Campus | PR | 25 | 64.0% |
| University of Puerto Rico-Rio Piedras Campus | PR | 94 | 90.4% |
| University of Rhode Island | RI | 303 | 88.5% |
| University of Rochester | NY | 1,651 | 71.8% |
| University of South Alabama | AL | 202 | 83.2% |
| University of South Carolina | SC | 743 | 64.9% |
| University of South Florida | FL | 925 | 89.7% |
| University of Southern Mississippi | MS | 133 | 74.4% |
| University of St. Thomas | MN | 91 | 82.4% |
| University of Texas at San Antonio | TX | 426 | 88.5% |
| University of Texas Health Science Center at San Antonio | TX | 1,004 | 60.5% |
| University of Texas Medical Branch | TX | 1,189 | 75.6% |
| University of Texas Southwestern Medical Center | TX | 2,509 | 70.2% |
| UNIVERSITY OF THE PACIFIC | CA | 121 | 87.6% |
| University of the Virgin Islands | VI | 61 | 88.5% |
| University of Utah | UT | 2,401 | 78.0% |
| University of Vermont Health Network Medical Group, Inc. | VT | 77 | 97.4% |
| UNIVERSITY OF VERMONT MEDICAL GROUP, INC. | VT | 190 | 94.2% |
| University of Virginia Health Services Foundation | VA | 113 | 78.8% |
| University of Washington | WA | 2,560 | 81.4% |
| UNIVERSITY OF WEST FLORIDA | FL | 105 | 81.0% |
| University of Wisconsin - Stevens Point | WI | 59 | 83.0% |
| UNIVERSITY OF WISCONSIN COLLEGES | WI | 39 | 87.2% |
| University of Wisconsin Medical Foundation | WI | 130 | 80.0% |
| University of Wisconsin System | WI | 1,629 | 57.5% |
| UNIVERSITY OF WISCONSIN-EAU CLAIRE | WI | 50 | 82.0% |
| UNIVERSITY OF WISCONSIN-MILWAUKEE | WI | 2,182 | 70.3% |
| UNIVERSITY OF WISCONSIN-STOUT | WI | 71 | 80.3% |
| University of Wisconsin-Whitewater | WI | 172 | 77.9% |
| University of Wyoming | WY | 596 | 59.6% |
| University Pediatricians | MI | 100 | 97.0% |
| University Physician Group | MI | 143 | 88.1% |
| UNIVERSITY PHYSICIANS & SURGEONS INC. | WV | 224 | 87.5% |
| University Primary Care Practices Inc. | OH | 62 | 91.9% |
| UNMC Physicians | NE | 146 | 91.1% |
| UofL Health - Louisville, Inc. | KY | 58 | 96.5% |
| UPMC Altoona | PA | 45 | 86.7% |
| UPMC Community Medicine, Inc. | PA | 263 | 83.7% |
| UPMC Medical Education | PA | 398 | 97.2% |
| UPMC Western Maryland Health Services LLC | PA | 69 | 89.9% |
| UPS Worldwide Forwarding, Inc. | KY | 35 | 97.1% |
| UPSTATE CEREBRAL PALSY, INC. | NY | 234 | 98.3% |
| Uptake Technologies, Inc. | IL | 96 | 92.7% |
| US ARMY DEFENSE LANGUAGE INSTITUTE FOREIGN LANGUAGE CENTER | CA | 246 | 90.7% |
| US Cellular Corporation | IL | 232 | 81.0% |
| US TECH SOLUTIONS INC | NJ | 624 | 95.0% |
| US Virgin Islands Department of Education | VI | 301 | 92.0% |
| USA Healthcare Management, LLC | AL | 175 | 89.1% |
| USA InfoTech, Inc | MD | 1,135 | 95.2% |
| USACS Medical Group Ltd. | OH | 166 | 97.0% |
| uShip, Inc. | TX | 20 | 95.0% |
| USM Business Systems Inc | VA | 1,849 | 83.4% |
| UST GLOBAL INC | CA | 19,536 | 93.7% |
| UT Le Bonheur Pediatric Specialists, Inc | TN | 123 | 90.2% |
| UT Medical Group, Inc. | TN | 111 | 90.1% |
| UT-BATTELLE, LLC (OAK RIDGE NATIONAL LABORATORY) | TN | 2,081 | 75.1% |
| Utah State University | UT | 403 | 91.3% |
| Uzun and Case LLC | GA | 58 | 94.8% |