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The Nature Index tracks primary research articles from 178 applied, health, natural and social sciences journals, across many different publishers, chosen by an independent group of researchers. The Nature Index provides absolute Count of primary research articles and fractional Share counts of author contribution to articles. The positions in the table below reflect United States of America (USA)'s position overall, regionally, and in subject areas based on their Share. Each position links to the corresponding table where United States of America (USA) is listed.
Position by research output Share
Position by research output Share in subject areas
Research
United States of America (USA) has the following research output in the current window (1 June 2025 - 30 May 2026) of the Nature Index. Click on Count to view a list of articles representing the corresponding Share value.
Overall research output
| Count | Share | |
|---|---|---|
| Overall | 37430 | 25586.60 |
Overall Count and Share for 'United States of America (USA)' based on the 12-month time frame mentioned above.
Research outputs by subject area
Note: Hover over the donut graph to view the Share for each subject.
Leading research topics
In the Current Index (12-month rolling window), United States of America (USA) published the most articles in these research topics. Learn more about Nature Research Intelligence Topics.
| Topics | Count | Share |
|---|---|---|
| Clinical Sciences | 3051 | 2127.08 |
| Oncology and Carcinogenesis | 2006 | 1412.77 |
| Biochemistry and Cell Biology | 1277 | 978.98 |
| Bioinformatics and Computational Biology | 1250 | 884.89 |
| Macromolecular and Materials Chemistry | 1251 | 858.55 |
| Astronomical Sciences | 1421 | 837.86 |
| Physical Chemistry | 1226 | 820.71 |
| Organic Chemistry | 990 | 806.16 |
| Quantum Physics | 1209 | 798.66 |
Share output for the past 5 years
| Subject area or journal group | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|
| Overall | 19,899 | 21,716 | 21,168 | 24,960 | 26,145 |
| Applied sciences | 2,668 | 2,395 | 2,354 | 3,619 | 0 |
| Health sciences | 5,326 | 8,228 | 7,999 | 8,754 | 0 |
| Natural sciences | 11,656 | 10,704 | 10,449 | 11,307 | 0 |
| Biological sciences | 4,167 | 4,000 | 3,620 | 3,874 | 0 |
| Chemistry | 3,173 | 2,812 | 2,922 | 3,124 | 3,375 |
| Earth & environmental sciences | 1,735 | 1,474 | 1,489 | 1,631 | 0 |
| Physical sciences | 2,581 | 2,418 | 2,418 | 2,679 | 0 |
| Social sciences | 250 | 388 | 366 | 1,279 | 0 |
| Nature & Science | 846 | 791 | 804 | 889 | 937 |
Country/territory benchmarking
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Collaboration
In many cases, the highest quality science comes from collaborating. Nature Index collaborations highlight fruitful collaborations that lead to high quality research around the world. The table and charts below highlight the leading collaborators with United States of America (USA).
Collaboration by percentage of Share
Note: Hover over the graph to view collaboration by percentage of Share.
Top 10 collaborators with United States of America (USA) by Share
Note: Hover over the bars to view details about each institution's Share.
| Collaborating country/territory | Collaborators' Share | Collaboration Score |
|---|---|---|
| China | 1846.25 / 3397.47 | 5243.72 |
| United Kingdom (UK) | 1582.17 / 1057.27 | 2639.44 |
| Germany | 1456.30 / 1029.41 | 2485.70 |
| Canada | 1199.52 / 671.97 | 1871.49 |
| France | 891.61 / 510.93 | 1402.55 |
| Japan | 740.37 / 424.83 | 1165.21 |
| South Korea | 592.87 / 497.74 | 1090.61 |
| Spain | 632.64 / 359.48 | 992.12 |
| Italy | 621.68 / 360.41 | 982.09 |
| Switzerland | 593.84 / 382.13 | 975.97 |
View historical country/territory collaboration
Top 10 institutions from United States of America (USA) by Share
| Institution | Count | Share |
|---|---|---|
| 1. Harvard University | 4195 | 1244.86 |
| 2. Stanford University | 2380 | 708.17 |
| 3. Massachusetts Institute of Technology (MIT) | 2392 | 583.42 |
| 4. University of Michigan (U-M) | 1674 | 480.58 |
| 5. Yale University | 1495 | 425.97 |
| 6. University of California, Berkeley (UC Berkeley) | 1639 | 420.58 |
| 7. National Institutes of Health (NIH) | 1250 | 416.63 |
| 8. University of Pennsylvania (Penn) | 1453 | 415.55 |
| 9. University of California, Los Angeles (UCLA) | 1472 | 400.96 |
| 10. University of California, San Diego (UC San Diego) | 1321 | 400.52 |
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