Prothena Corporation plc (PRTA)
NASDAQ: PRTA · Real-Time Price · USD
9.15
+0.22 (2.46%)
At close: Jun 22, 2026, 4:00 PM EDT
8.97
-0.18 (-1.97%)
After-hours: Jun 22, 2026, 6:05 PM EDT
Prothena Corporation Stock Price History
Historical Data
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Jun 22, 2026 | 8.90 | 9.27 | 8.89 | 9.15 | 9.15 | 2.46% | 612,353 |
| Jun 18, 2026 | 8.63 | 9.15 | 8.52 | 8.93 | 8.93 | 5.18% | 1,390,682 |
| Jun 17, 2026 | 8.39 | 8.72 | 8.39 | 8.49 | 8.49 | 2.41% | 542,367 |
| Jun 16, 2026 | 8.16 | 8.35 | 7.85 | 8.29 | 8.29 | 1.72% | 585,996 |
| Jun 15, 2026 | 8.69 | 8.77 | 7.93 | 8.15 | 8.15 | -1.21% | 622,341 |
| Jun 12, 2026 | 8.26 | 8.45 | 8.23 | 8.25 | 8.25 | -0.12% | 314,129 |
| Jun 11, 2026 | 7.89 | 8.46 | 7.73 | 8.26 | 8.26 | 4.42% | 633,585 |
| Jun 10, 2026 | 8.42 | 8.59 | 7.89 | 7.91 | 7.91 | -6.61% | 456,644 |
| Jun 9, 2026 | 8.56 | 8.87 | 8.35 | 8.47 | 8.47 | -1.05% | 491,176 |
| Jun 8, 2026 | 8.80 | 8.89 | 8.53 | 8.56 | 8.56 | -2.62% | 312,807 |
| Jun 5, 2026 | 9.25 | 9.38 | 8.63 | 8.79 | 8.79 | -4.97% | 655,718 |
| Jun 4, 2026 | 9.03 | 9.45 | 9.03 | 9.25 | 9.25 | 3.70% | 504,475 |
| Jun 3, 2026 | 9.21 | 9.21 | 8.73 | 8.92 | 8.92 | -2.94% | 593,078 |
| Jun 2, 2026 | 9.59 | 9.59 | 9.12 | 9.19 | 9.19 | -4.17% | 438,610 |
| Jun 1, 2026 | 10.03 | 10.07 | 9.50 | 9.59 | 9.59 | -5.80% | 391,244 |
| May 29, 2026 | 9.93 | 10.24 | 9.80 | 10.18 | 10.18 | 2.00% | 501,434 |
| May 28, 2026 | 9.95 | 10.05 | 9.93 | 9.98 | 9.98 | -0.50% | 281,818 |
| May 27, 2026 | 10.11 | 10.26 | 10.01 | 10.03 | 10.03 | -0.30% | 616,187 |
| May 26, 2026 | 9.84 | 10.07 | 9.45 | 10.06 | 10.06 | 2.34% | 918,666 |
| May 22, 2026 | 9.36 | 10.00 | 9.36 | 9.83 | 9.83 | 4.46% | 510,853 |
| May 21, 2026 | 9.16 | 9.42 | 9.04 | 9.41 | 9.41 | 0.64% | 388,741 |
| May 20, 2026 | 9.09 | 9.41 | 9.09 | 9.35 | 9.35 | 3.09% | 624,875 |
| May 19, 2026 | 9.61 | 9.84 | 9.02 | 9.07 | 9.07 | -5.42% | 627,307 |
| May 18, 2026 | 9.66 | 10.09 | 9.53 | 9.59 | 9.59 | -1.74% | 650,972 |
| May 15, 2026 | 9.73 | 9.86 | 9.46 | 9.76 | 9.76 | -1.01% | 700,063 |
| May 14, 2026 | 9.60 | 9.88 | 9.42 | 9.86 | 9.86 | 2.71% | 452,435 |
| May 13, 2026 | 9.33 | 9.73 | 9.28 | 9.60 | 9.60 | 1.80% | 530,784 |
| May 12, 2026 | 9.67 | 9.82 | 9.29 | 9.43 | 9.43 | -2.48% | 495,103 |
| May 11, 2026 | 10.79 | 10.88 | 9.46 | 9.67 | 9.67 | -9.88% | 932,830 |
| May 8, 2026 | 11.00 | 11.80 | 10.62 | 10.73 | 10.73 | 2.00% | 798,769 |
| May 7, 2026 | 11.10 | 11.21 | 10.40 | 10.52 | 10.52 | -5.90% | 443,144 |
| May 6, 2026 | 11.19 | 11.30 | 11.02 | 11.18 | 11.18 | -0.09% | 333,877 |
| May 5, 2026 | 10.89 | 11.25 | 10.89 | 11.19 | 11.19 | 3.71% | 306,816 |
| May 4, 2026 | 10.58 | 11.00 | 10.55 | 10.79 | 10.79 | 1.41% | 592,359 |
| May 1, 2026 | 11.04 | 11.14 | 10.64 | 10.64 | 10.64 | -3.80% | 516,354 |
| Apr 30, 2026 | 10.89 | 11.12 | 10.84 | 11.06 | 11.06 | 1.75% | 319,520 |
| Apr 29, 2026 | 11.46 | 11.46 | 10.74 | 10.87 | 10.87 | -5.56% | 397,881 |
| Apr 28, 2026 | 10.84 | 11.57 | 10.83 | 11.51 | 11.51 | 6.67% | 439,891 |
| Apr 27, 2026 | 10.71 | 11.12 | 10.71 | 10.79 | 10.79 | 0.37% | 314,337 |
| Apr 24, 2026 | 10.65 | 10.82 | 10.40 | 10.75 | 10.75 | 0.19% | 287,930 |
| Apr 23, 2026 | 10.69 | 11.07 | 10.60 | 10.73 | 10.73 | 0.09% | 474,683 |
| Apr 22, 2026 | 10.69 | 10.85 | 10.61 | 10.72 | 10.72 | 0.47% | 350,784 |
| Apr 21, 2026 | 10.78 | 10.78 | 10.48 | 10.67 | 10.67 | -1.11% | 451,072 |
| Apr 20, 2026 | 10.82 | 10.97 | 10.77 | 10.79 | 10.79 | -1.01% | 333,298 |
| Apr 17, 2026 | 10.71 | 10.99 | 10.70 | 10.90 | 10.90 | 3.61% | 486,483 |
| Apr 16, 2026 | 10.78 | 10.85 | 10.45 | 10.52 | 10.52 | -2.77% | 298,913 |
| Apr 15, 2026 | 10.62 | 10.87 | 10.51 | 10.82 | 10.82 | 1.98% | 409,927 |
| Apr 14, 2026 | 10.34 | 10.67 | 10.34 | 10.61 | 10.61 | 2.91% | 370,945 |
| Apr 13, 2026 | 10.49 | 10.55 | 10.18 | 10.31 | 10.31 | -1.81% | 334,063 |
| Apr 10, 2026 | 10.60 | 10.60 | 10.37 | 10.50 | 10.50 | -0.76% | 319,034 |