| U.P. Rehab Services, LLC | MI | 107 | 54.2% |
| U.S. BANK NATIONAL ASSOCIATION | MN | 3,160 | 95.6% |
| U.S. Well Services, LLC | TX | 10 | 90.0% |
| U.S.D. 501, Topeka Public Schools | KS | 80 | 83.8% |
| Uber Technologies, Inc. | CA | 6,900 | 94.0% |
| UBS AG | TN | 312 | 77.2% |
| UBS Business Solutions US LLC | TN | 1,878 | 95.2% |
| UBS Securities LLC | TN | 1,332 | 79.6% |
| UBS SERVICES LLC | CT | 8 | 100.0% |
| UChicago Argonne LLC | IL | 1,309 | 83.9% |
| UCI GROUP OF HEALTH CARE SERVICES | FL | 97 | 99.0% |
| UCSF MEDICAL CENTER | CA | 1,175 | 83.8% |
| Udemy, Inc. | CA | 170 | 91.8% |
| UHCP D/B/A UPMC MEDICAL EDUCATION | PA | 601 | 91.5% |
| UHY ADVISORS NY, INC. | NY | 53 | 73.6% |
| Uktha Global, Inc | GA | 363 | 87.9% |
| ULTIMATE CARE INC. | FL | 615 | 94.2% |
| UMass Chan Medical School | MA | 1 | 100.0% |
| UMass Memorial Medical Group, Inc. | MA | 289 | 93.8% |
| UMB Bank NA | MO | 125 | 93.6% |
| UNICON International, Inc. | OH | 150 | 97.3% |
| Unicon Pharma Inc | NJ | 679 | 75.5% |
| UNICORN TECHNOLOGIES, LLC | GA | 801 | 81.2% |
| UNIFIED BUSINESS TECHNOLOGIES, INC | MI | 233 | 92.3% |
| Unified School District 457 | KS | 118 | 96.6% |
| Unified School District No 259 Sedgwick County KS | KS | 82 | 93.9% |
| UNIFY SOLUTIONS INC | MD | 1,282 | 82.9% |
| UNIKON IT INC | TX | 480 | 85.8% |
| Union Hospital, Inc. | IN | 56 | 83.9% |
| Union Pacific Railroad Company | NE | 244 | 91.8% |
| Union Underwear Company, Inc. | KY | 78 | 79.5% |
| UNIQUE KEY RESOURCES INC | TN | 430 | 95.8% |
| Unique Services Associates, Inc. | AR | 112 | 89.3% |
| Unique System Skills LLC | NH | 120 | 94.2% |
| uniQure, Inc. | MA | 43 | 90.7% |
| United Airlines, Inc. | IL | 324 | 83.0% |
| UNITED BANK CARD | NJ | 1 | 0.0% |
| UNITED CEREBRAL PALSY ASSOCIATIONS OF NYS, INC. | NY | 131 | 88.5% |
| United Health Centers of the San Joaquin Valley | CA | 73 | 78.1% |
| United Health Services Hospitals, Inc. | NY | 269 | 78.4% |
| United HealthCare Services, Inc. | MN | 1,034 | 94.8% |
| United Hospital Center, Inc. | WV | 46 | 91.3% |
| UNITED METHODIST HOMES AND SERVICES | IL | 143 | 69.9% |
| United Parcel Service General Services Co. | GA | 282 | 94.7% |
| UNITED PHARMA TECHNOLOGIES, INC. | NJ | 351 | 90.9% |
| United Rehab Solutions LLC | MI | 63 | 87.3% |
| United Services Automobile Association | TX | 537 | 98.1% |
| United Software Group, Inc. | OH | 1,226 | 71.5% |
| United Solutions, LLC | MD | 496 | 83.3% |
| United States Steel Corporation | PA | 108 | 98.2% |
| United States Technologies Communications Corporation | NJ | 1 | 100.0% |
| United Supermarkets, LLC | TX | 45 | 80.0% |
| United Tech Systems Inc | GA | 237 | 95.4% |
| United Wholesale Mortgage, LLC | MI | 382 | 95.0% |
| Unity Health Network LLC | OH | 42 | 90.5% |
| Unity Hospital | NY | 106 | 97.2% |
| UniUni Logistics Inc | CA | 106 | 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 | 141 | 87.9% |
| Universal Rehab Services, Inc. | TN | 85 | 80.0% |
| Universal Service Administrative Company | DC | 105 | 97.1% |
| Universidad Central del Caribe, Inc. | PR | 22 | 81.8% |
| Universidad Interamericana de Puerto Rico | PR | 23 | 91.3% |
| University at Buffalo Pediatric Associates, Inc. | NY | 52 | 92.3% |
| University Community Hospital, Inc. | FL | 213 | 97.2% |
| University Corporation for Atmospheric Research | CO | 454 | 63.2% |
| University Health Physicians | MO | 148 | 94.6% |
| University Hospitals Cleveland Medical Center | OH | 331 | 91.5% |
| University Hospitals Medical Group, Inc. | OH | 341 | 94.1% |
| University Medical Center, Inc. | KY | 56 | 91.1% |
| University of Alabama Health Services Foundation, PC | AL | 407 | 64.9% |
| University of Alaska | AK | 372 | 63.4% |
| University of Arizona | AZ | 1,988 | 68.9% |
| University of Arkansas | AR | 763 | 77.6% |
| University of Arkansas for Medical Sciences | AR | 1,696 | 91.2% |
| University of California at Santa Barbara | CA | 990 | 77.5% |
| University of California, Berkeley | CA | 2,095 | 85.3% |
| University of California, Davis | CA | 2,848 | 70.9% |
| University of California, Irvine | CA | 1,148 | 73.6% |
| University of California, Los Angeles | CA | 2,796 | 82.9% |
| UNIVERSITY OF CALIFORNIA, MERCED | CA | 158 | 88.6% |
| University of California, Riverside | CA | 257 | 75.1% |
| UNIVERSITY OF CALIFORNIA, SAN DIEGO | CA | 3,031 | 68.4% |
| University of California, Santa Cruz | CA | 435 | 72.4% |
| UNIVERSITY OF CENTRAL FLORIDA | FL | 691 | 84.2% |
| University of Central Missouri | MO | 123 | 86.2% |
| University of Central Oklahoma | OK | 94 | 88.3% |
| University of Chicago Medical Center | IL | 365 | 93.4% |
| UNIVERSITY OF CINCINNATI | OH | 883 | 89.8% |
| UNIVERSITY OF CINCINNATI MEDICAL CENTER, LLC | OH | 95 | 97.9% |
| University of Cincinnati Physicians, Inc. | OH | 57 | 86.0% |
| University of Colorado | CO | 3,708 | 66.3% |
| University of Connecticut | CT | 1,293 | 78.7% |
| University of Connecticut Health Center | CT | 522 | 75.3% |
| UNIVERSITY OF DELAWARE | DE | 724 | 70.2% |
| University of Detroit Mercy | MI | 166 | 90.4% |
| UNIVERSITY OF FLORIDA | FL | 3,560 | 79.0% |
| University of Georgia; OGE | GA | 503 | 71.4% |
| University of Guam | GU | 88 | 92.0% |
| University of Hawaii | HI | 1,048 | 74.1% |
| University of Houston | TX | 1,787 | 71.3% |
| University of Idaho | ID | 325 | 90.2% |
| UNIVERSITY OF KENTUCKY | KY | 1,670 | 85.1% |
| University of Louisiana at Lafayette | LA | 250 | 98.8% |
| University of Louisville | KY | 810 | 88.0% |
| UNIVERSITY OF LOUISVILLE PHYSICIANS, INC. | KY | 88 | 93.2% |
| University of Maine | ME | 296 | 93.6% |
| University of Maryland Baltimore | MD | 3,029 | 70.2% |
| UNIVERSITY OF MARYLAND COLLEGE PARK | MD | 2,088 | 73.5% |
| University of Massachusetts Amherst | MA | 1,186 | 80.7% |
| University of Massachusetts Dartmouth | MA | 750 | 66.5% |
| UNIVERSITY OF MASSACHUSETTS LOWELL | MA | 205 | 92.7% |
| University of Massachusetts Medical School | MA | 1,300 | 68.9% |
| UNIVERSITY OF MIAMI | FL | 1,205 | 87.6% |
| University of Michigan | MI | 7,473 | 69.7% |
| UNIVERSITY OF MINNESOTA | MN | 2,354 | 94.1% |
| University of Minnesota Physicians | MN | 202 | 94.1% |
| University of Mississippi | MS | 607 | 73.8% |
| University of Mississippi Medical Center | MS | 831 | 78.0% |
| University of Nebraska at Omaha | NE | 183 | 88.0% |
| University of Nebraska Medical Center | NE | 859 | 93.8% |
| University of Nevada, Reno | NV | 1,013 | 85.7% |
| University of New Hampshire | NH | 414 | 74.4% |
| University of New Haven | CT | 120 | 79.2% |
| University of New Mexico | NM | 540 | 92.0% |
| UNIVERSITY OF NEW MEXICO HEALTH SCIENCES CENTER | NM | 209 | 91.4% |
| University of New Orleans | LA | 116 | 83.6% |
| UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL | NC | 2,093 | 69.0% |
| University of North Carolina at Charlotte | NC | 402 | 74.4% |
| University of North Carolina Wilmington | NC | 163 | 81.6% |
| University of North Dakota | ND | 427 | 93.7% |
| UNIVERSITY OF NORTH FLORIDA | FL | 134 | 78.4% |
| UNIVERSITY OF NORTH GEORGIA | GA | 160 | 90.0% |
| UNIVERSITY OF NORTH TEXAS | TX | 563 | 63.4% |
| University of North Texas Health Science Center | TX | 320 | 64.7% |
| University of Northern Iowa | IA | 149 | 83.9% |
| University of Notre Dame du Lac | IN | 1,029 | 80.2% |
| University of Oklahoma | OK | 1,323 | 92.5% |
| University of Oklahoma Health Sciences Center | OK | 756 | 89.7% |
| University of Oregon | OR | 757 | 74.0% |
| University of Phoenix, an Apollo Education Group, Inc. company | AZ | 360 | 76.1% |
| University of Pittsburgh | PA | 3,715 | 82.3% |
| University of Pittsburgh Physicians | PA | 1,371 | 81.0% |
| UNIVERSITY OF PUERTO RICO AT CAYEY | PR | 33 | 78.8% |
| UNIVERSITY OF PUERTO RICO-Mayaguez Campus | PR | 89 | 73.0% |
| University of Puerto Rico-Medical Science Campus | PR | 26 | 65.4% |
| University of Puerto Rico-Rio Piedras Campus | PR | 95 | 90.5% |
| University of Rhode Island | RI | 311 | 88.4% |
| University of Rochester | NY | 1,721 | 72.5% |
| University of San Diego | CA | 140 | 84.3% |
| University of South Alabama | AL | 205 | 83.4% |
| University of South Carolina | SC | 767 | 65.7% |
| University of South Florida | FL | 951 | 89.4% |
| University of Southern Mississippi | MS | 137 | 75.2% |
| University of St. Thomas | MN | 95 | 83.2% |
| University of Texas at San Antonio | TX | 430 | 87.7% |
| University of Texas Health Science Center at San Antonio | TX | 1,027 | 61.0% |
| University of Texas Medical Branch | TX | 1,227 | 76.3% |
| University of Texas Southwestern Medical Center | TX | 2,663 | 69.6% |
| UNIVERSITY OF THE PACIFIC | CA | 126 | 87.3% |
| University of the Virgin Islands | VI | 61 | 88.5% |
| University of Utah | UT | 2,468 | 78.3% |
| University of Vermont Health Network Medical Group, Inc. | VT | 83 | 97.6% |
| UNIVERSITY OF VERMONT MEDICAL GROUP, INC. | VT | 198 | 93.4% |
| University of Virginia Health Services Foundation | VA | 113 | 78.8% |
| University of Washington | WA | 2,633 | 81.7% |
| UNIVERSITY OF WEST FLORIDA | FL | 109 | 81.7% |
| University of Wisconsin - Stevens Point | WI | 60 | 83.3% |
| UNIVERSITY OF WISCONSIN COLLEGES | WI | 39 | 87.2% |
| University of Wisconsin Medical Foundation | WI | 134 | 79.8% |
| University of Wisconsin System | WI | 1,749 | 56.5% |
| UNIVERSITY OF WISCONSIN-EAU CLAIRE | WI | 50 | 82.0% |
| UNIVERSITY OF WISCONSIN-MILWAUKEE | WI | 2,191 | 70.3% |
| UNIVERSITY OF WISCONSIN-STOUT | WI | 72 | 80.6% |
| University of Wisconsin-Whitewater | WI | 176 | 78.4% |
| University of Wyoming | WY | 610 | 60.2% |
| University Pediatricians | MI | 103 | 97.1% |
| University Physician Group | MI | 148 | 88.5% |
| UNIVERSITY PHYSICIANS & SURGEONS INC. | WV | 238 | 88.2% |
| University Primary Care Practices Inc. | OH | 63 | 92.1% |
| UNMC Physicians | NE | 151 | 91.4% |
| UofL Health - Louisville, Inc. | KY | 63 | 96.8% |
| UOP LLC | IL | 163 | 77.9% |
| UPMC Altoona | PA | 45 | 86.7% |
| UPMC Community Medicine, Inc. | PA | 264 | 83.7% |
| UPMC Medical Education | PA | 439 | 97.0% |
| UPMC Western Maryland Health Services LLC | PA | 71 | 90.1% |
| UPS Worldwide Forwarding, Inc. | KY | 35 | 97.1% |
| UPSTATE CEREBRAL PALSY, INC. | NY | 289 | 98.3% |
| US ARMY DEFENSE LANGUAGE INSTITUTE FOREIGN LANGUAGE CENTER | CA | 258 | 91.1% |
| US Cellular Corporation | IL | 232 | 81.0% |
| US TECH SOLUTIONS INC | NJ | 636 | 95.1% |
| US Virgin Islands Department of Education | VI | 309 | 92.2% |
| USA Healthcare Management, LLC | AL | 177 | 89.3% |
| USA InfoTech, Inc | MD | 1,150 | 95.3% |
| USACS Medical Group Ltd. | OH | 202 | 97.5% |
| uShip, Inc. | TX | 20 | 95.0% |
| USM Business Systems Inc | VA | 1,873 | 83.6% |
| UST GLOBAL INC | CA | 19,998 | 93.8% |
| UT Le Bonheur Pediatric Specialists, Inc | TN | 131 | 90.1% |
| UT Medical Group, Inc. | TN | 122 | 90.2% |
| UT-BATTELLE, LLC (OAK RIDGE NATIONAL LABORATORY) | TN | 2,112 | 74.8% |
| Utah State University | UT | 420 | 91.4% |
| Uzun and Case LLC | GA | 61 | 95.1% |