| 401 | 835 | Regenstrief Institute |  | 4634 | 1621 | 1270 | 1074 |
| 402 | 418 | Regeneron Pharmaceuticals Inc | | 2640 | 739 | 355 | 850 |
| 403 | 2389 | Rede Nacional de Ensino e Pesquisa |  | 455 | 663 | 2442 | 3879 |
| 404 | 5136 | Rede de Tecnologia do Rio de Janeiro | | 5336 | 3521 | 2538 | 3879 |
| 405 | 4134 | Red Universitaria Nacional REUNA |  | 5271 | 2028 | 2538 | 3879 |
| 406 | 5270 | Red de Interconexión Universitaria |  | 5677 | 3674 | 2538 | 3879 |
| 407 | 6974 | Red Avanzada de Investigación, Ciencia y Educación |  | 7054 | 6216 | 2538 | 3879 |
| 408 | 3463 | Red Académica Uruguaya |  | 2931 | 1255 | 2538 | 3879 |
| 409 | 5650 | Rapid City Medical Center | | 5831 | 4231 | 2538 | 3879 |
| 410 | 51 | Rand Corporation | | 276 | 30 | 109 | 353 |
| 411 | 2301 | Ralph H. Johnson VA Medical Center | | 5175 | 5799 | 2538 | 722 |
| 412 | 4516 | Raleigh Orthopaedic Clinic | | 5959 | 4127 | 2538 | 3509 |
| 413 | 435 | Rady Childrens Hospital and Health Center San Diego | | 1377 | 920 | 1188 | 507 |
| 414 | 6197 | Radiology Associates of Tallahassee | | 7106 | 4931 | 2538 | 3879 |
| 415 | 5349 | Radio Observatorio de Jicamarca |  | 4468 | 4918 | 2538 | 3660 |
| 416 | 1799 | Radiation Therapy Oncology Group | | 3525 | 1818 | 2538 | 2104 |
| 417 | 4525 | Queen's Medical Center Honolulu Hawaii | | 6809 | 2486 | 2538 | 3879 |
| 418 | 7536 | Quality Enhancement Research Initiative | | 5460 | 7237 | 2538 | 3879 |
| 419 | 1268 | Public Health Institute | | 3152 | 1112 | 2538 | 1508 |
| 420 | 1360 | Providence Saint John's Health Center | | 42 | 246 | 947 | 3879 |
| 421 | 6332 | Providence Medical Group (South Carolina Heart Center) | | 6832 | 5185 | 2538 | 3879 |
| 422 | 7697 | Proteogenomics Research Institute for Systems Medicine | | 7904 | 7270 | 2538 | 3879 |
| 423 | 7076 | Prosthetics Research Study | | 7389 | 6307 | 2538 | 3879 |
| 424 | 6981 | Prosthetics and Sensory Aids Service | | 7030 | 6230 | 2538 | 3879 |
| 425 | 3046 | Property and Environment Research Center | | 3062 | 790 | 2538 | 3879 |
| 426 | 331 | Princeton Plasma Physics Laboratory | | 815 | 504 | 286 | 841 |
| 427 | 3562 | Prince William Sound Science Center | | 2923 | 3706 | 2063 | 3660 |
| 428 | 3314 | Prevention Research Center | | 6180 | 3868 | 2538 | 2867 |
| 429 | 6888 | Presbyterian Ear Institute | | 7617 | 5950 | 2538 | 3879 |
| 430 | 6346 | Premier Bone & Joint Centers (Gem City Bone and Joint Clinic) | | 5964 | 5281 | 2538 | 3879 |
| 431 | 4161 | Powder Coating Institute | | 5175 | 2067 | 2538 | 3879 |
| 432 | 3830 | Potomac Institute for Policy Studies | | 3185 | 1728 | 2538 | 3879 |
| 433 | 6447 | Postgraduate Center for Mental Health | | 7580 | 5230 | 2538 | 3879 |
| 434 | 545 | Population Council | | 2064 | 518 | 1201 | 1490 |
| 435 | 2669 | Point Blue (Point Reyes Bird Observatory) | | 3605 | 1544 | 1434 | 3879 |
| 436 | 6459 | Plasma Proteome Institute | | 6651 | 6197 | 2538 | 3660 |
| 437 | 3970 | Planta Piloto de Procesos Industriales Microbiológicos | | 7297 | 6777 | 1672 | 2867 |
| 438 | 5902 | Planta Piloto de Ingeniería Química | | 6695 | 7850 | 2538 | 2290 |
| 439 | 6050 | Plano Orthopedic and Sports Medicine Center | | 5859 | 4843 | 2538 | 3879 |
| 440 | 409 | Planetary Science Institute | | 1935 | 577 | 626 | 911 |
| 441 | 2603 | Pittsburgh Supercomputing Center | | 2196 | 465 | 2538 | 3879 |
| 442 | 5399 | Pittsburgh Mercy Health System | | 7843 | 3471 | 2538 | 3879 |
| 443 | 4670 | Pinchot Institute for Conservation | | 4459 | 2946 | 2538 | 3879 |
| 444 | 3786 | Pierre Auger Observatory | | 5571 | 1520 | 2538 | 3879 |
| 445 | 3716 | Phoenix VA Health Care System | | 6194 | 6269 | 2538 | 2039 |
| 446 | 7563 | Phoenix Heart Center | | 8091 | 6807 | 2538 | 3879 |
| 447 | 2529 | Philadelphia VA Medical Center | | 6427 | 6688 | 2538 | 467 |
| 448 | 5276 | Philadelphia Hand to Shoulder Center | | 7212 | 5078 | 2538 | 3509 |
| 449 | 1340 | Peterson Institute for International Economics | | 1182 | 196 | 524 | 3879 |
| 450 | 5217 | Perry Institute for Marine Science | | 6273 | 4562 | 2538 | 3660 |
| 451 | 201 | Perimeter Institute for Theoretical Physics |  | 688 | 521 | 349 | 260 |
| 452 | 355 | Pennington Biomedical Research Center | | 2295 | 948 | 245 | 448 |
| 453 | 7292 | Pelosi Medical Center | | 7468 | 6675 | 2538 | 3879 |
| 454 | 4478 | Pediatrix Medical Group | | 2679 | 2772 | 2538 | 3879 |
| 455 | 5803 | Peachtree Orthopaedic Clinic | | 7041 | 4339 | 2538 | 3879 |
| 456 | 2900 | PeaceHealth Southwest Medical Center (Southwest Washington Medical Center) | | 1077 | 745 | 2538 | 3879 |
| 457 | 5497 | Patuxent Wildlife Research Center | | 3468 | 4214 | 2538 | 3879 |
| 458 | 5620 | Partners HealthCare Personalized Medicine Genetics and Genomics | | 6722 | 4099 | 2538 | 3879 |
| 459 | 5598 | Parkinson's Institute | | 7634 | 3849 | 2538 | 3879 |
| 460 | 6412 | Paparella Ear Head and Neck Institute | | 6788 | 5304 | 2538 | 3879 |
| 461 | 4042 | Pankey Institute | | 4658 | 1933 | 2538 | 3879 |
| 462 | 426 | Palo Alto Research Center | | 2710 | 363 | 317 | 1473 |
| 463 | 1491 | Palo Alto Medical Foundation | | 4135 | 446 | 2538 | 2867 |
| 464 | 3431 | Pacific Whale Foundation | | 4671 | 1152 | 2538 | 3879 |
| 465 | 5403 | Pacific Rim Conservation | | 6414 | 5377 | 2538 | 3509 |
| 466 | 1177 | Pacific Northwest National Laboratory | | 441 | 211 | 27 | 3879 |
| 467 | 4971 | Pacific Northwest Diabetes Research Institute | | 7012 | 4003 | 2445 | 3879 |
| 468 | 6572 | Pacific International Center for High Technology Research | | 6430 | 5601 | 2538 | 3879 |
| 469 | 4704 | Pacific Institute for the Mathematical Sciences | | 1751 | 3198 | 2538 | 3879 |
| 470 | 2614 | Pacific Institute for Studies in Development Environment and Security | | 2749 | 458 | 2538 | 3879 |
| 471 | 1375 | Pacific Institute for Research and Evaluation | | 4431 | 2147 | 1798 | 2002 |
| 472 | 6840 | Pacific Health Research and Education Institute Hawaii | | 7684 | 6601 | 2538 | 3660 |
| 473 | 6523 | Overton Brooks VA Medical Center Shreveport LA | | 7064 | 7126 | 2538 | 3316 |
| 474 | 6095 | Outcomes Research Institute | | 4719 | 5011 | 2538 | 3879 |
| 475 | 218 | Ottawa Health Research Institute | | 1946 | 796 | 108 | 208 |
| 476 | 345 | Ottawa Civic Hospital | | 2352 | 1220 | 1376 | 144 |
| 477 | 4319 | Osiris Therapeutics | | 3743 | 2436 | 2538 | 3879 |
| 478 | 2524 | OSF Saint Francis Medical Center | | 894 | 954 | 2258 | 3879 |
| 479 | 7242 | Oscar G. Johnson VA Medical Center | | 6295 | 7315 | 2538 | 3660 |
| 480 | 7122 | Orthopaedic Research of Virginia | | 5884 | 6526 | 2538 | 3879 |
| 481 | 7235 | Orlando Clinical Research Center | | 7368 | 6589 | 2538 | 3879 |
| 482 | 2764 | Organization for Tropical Studies |  | 2870 | 1930 | 2538 | 3252 |
| 483 | 6930 | Orentreich Foundation for Advancement of Science | | 6922 | 6151 | 2538 | 3879 |
| 484 | 1624 | Oregon Social Learning Centre | | 4795 | 3258 | 1957 | 1891 |
| 485 | 746 | Oregon Research Institute | | 4596 | 1337 | 346 | 1380 |
| 486 | 3110 | Oregon Institute of Science and Medicine | | 6107 | 741 | 2538 | 3879 |
| 487 | 4142 | Oregon College of Oriental Medicine | | 4017 | 2300 | 2521 | 3879 |
| 488 | 4351 | Oregon Clinic | | 4304 | 2446 | 2538 | 3879 |
| 489 | 4545 | Ontario Research Center for Computer Algebra | | 5048 | 2688 | 2538 | 3879 |
| 490 | 7624 | Ontario Hydro Energy | | 8091 | 6958 | 2538 | 3879 |
| 491 | 6790 | Ontar Corporation | | 7725 | 5743 | 2538 | 3879 |
| 492 | 5711 | OncoSalud | | 5830 | 4349 | 2538 | 3879 |
| 493 | 5111 | Omega-3 Research Institute | | 7945 | 2904 | 2538 | 3879 |
| 494 | 4825 | Olive View UCLA Medical Center | | 6277 | 5506 | 2538 | 3252 |
| 495 | 6304 | Olin Neuropsychiatry Research Center | | 7137 | 5079 | 2538 | 3879 |
| 496 | 5776 | Oklahoma State University Medical Center | | 6695 | 4355 | 2538 | 3879 |
| 497 | 685 | Oklahoma Medical Research Foundation | | 2917 | 1694 | 607 | 865 |
| 498 | 4734 | Oklahoma Blood Institute | | 6351 | 2880 | 2538 | 3879 |
| 499 | 3295 | Ohio Supercomputer Center | | 2823 | 1052 | 2538 | 3879 |
| 500 | 2633 | Ohio Aerospace Institute | | 6129 | 3105 | 2538 | 2510 |
