| 2025-06-07 | UFC 316: Dvalishvili vs. O'Malley 2 | Women’s Bantamweight | Kayla Harrison def. Julianna Peña title | Submission (kimura) | 2 | 4:55 |
| 2024-10-05 | UFC 307: Pereira vs. Rountree Jr. | Women’s Bantamweight | Julianna Peña def. Raquel Pennington title | Decision (split) (48–47, 47–48, 48–47) | 5 | 5:00 |
| 2022-07-30 | UFC 277: Peña vs. Nunes 2 | Women’s Bantamweight | Amanda Nunes def. Julianna Peña title | Decision (unanimous) (50–45, 50–44, 50–43) | 5 | 5:00 |
| 2021-12-11 | UFC 269: Oliveira vs. Poirier | Women’s Bantamweight | Julianna Peña def. Amanda Nunes title | Submission (rear-naked choke) | 2 | 3:26 |
| 2021-01-24 | UFC 257: Poirier vs. McGregor 2 | Women’s Bantamweight | Julianna Peña def. Sara McMann | Submission (rear-naked choke) | 3 | 3:39 |
| 2020-10-04 | UFC on ESPN: Holm vs. Aldana | Women’s Bantamweight | Germaine de Randamie def. Julianna Peña | Technical Submission (guillotine choke) | 3 | 3:25 |
| 2019-07-13 | UFC Fight Night: de Randamie vs. Ladd | Women’s Bantamweight | Julianna Peña def. Nicco Montaño | Decision (unanimous) (29–28, 29–28, 29–27) | 3 | 5:00 |
| 2017-01-28 | UFC on Fox: Shevchenko vs. Peña | Women’s Bantamweight | Valentina Shevchenko def. Julianna Peña | Submission (armbar) | 2 | 4:29 |
| 2016-07-09 | UFC 200: Tate vs. Nunes | Women’s Bantamweight | Julianna Peña def. Cat Zingano | Decision (unanimous) (29–28, 29–28, 29–28) | 3 | 5:00 |
| 2015-10-03 | UFC 192: Cormier vs. Gustafsson | Women’s Bantamweight | Julianna Peña def. Jessica Eye | Decision (unanimous) (29–27, 29–27, 29–27) | 3 | 5:00 |
| 2015-04-04 | UFC Fight Night: Mendes vs. Lamas | Women’s Bantamweight | Julianna Peña def. Milana Dudieva | TKO (punches and elbows) | 1 | 3:59 |
| 2013-11-30 | The Ultimate Fighter: Team Rousey vs. Team Tate Finale | Women’s Bantamweight | Julianna Peña def. Jessica Rakoczy | TKO (punches and elbows) | 1 | 4:59 |