Prothena Corporation plc (PRTA)
NASDAQ: PRTA · Real-Time Price · USD
8.20
-0.05 (-0.61%)
At close: Oct 23, 2026, 4:00 PM EDT
9.10
+0.90 (10.98%)
After-hours: Oct 23, 2026, 7:30 PM EDT
Prothena Corporation Stock Price History
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Oct 23, 2026 | 8.18 | 8.27 | 7.93 | 8.20 | 8.20 | -0.61% | 386,137 |
| Oct 22, 2026 | 8.01 | 8.29 | 7.96 | 8.25 | 8.25 | 2.74% | 381,827 |
| Oct 21, 2026 | 8.47 | 8.54 | 8.01 | 8.03 | 8.03 | -5.53% | 461,391 |
| Oct 20, 2026 | 8.55 | 8.65 | 8.45 | 8.50 | 8.50 | 0.24% | 529,032 |
| Oct 19, 2026 | 8.39 | 8.57 | 8.31 | 8.48 | 8.48 | 1.56% | 361,132 |
| Oct 16, 2026 | 8.58 | 8.62 | 8.24 | 8.35 | 8.35 | -1.76% | 670,257 |
| Oct 15, 2026 | 8.54 | 8.65 | 8.44 | 8.50 | 8.50 | 1.55% | 358,380 |
| Oct 14, 2026 | 8.28 | 8.56 | 8.19 | 8.37 | 8.37 | 0.12% | 620,027 |
| Oct 13, 2026 | 8.45 | 8.55 | 8.20 | 8.36 | 8.36 | -0.83% | 573,312 |
| Oct 12, 2026 | 8.81 | 8.81 | 8.40 | 8.43 | 8.43 | -4.64% | 489,760 |
| Oct 9, 2026 | 8.57 | 9.31 | 8.50 | 8.84 | 8.84 | 2.67% | 931,625 |
| Oct 8, 2026 | 8.43 | 8.81 | 8.36 | 8.61 | 8.61 | 1.53% | 642,408 |
| Oct 7, 2026 | 7.93 | 8.63 | 7.88 | 8.48 | 8.48 | 5.74% | 690,412 |
| Oct 6, 2026 | 8.28 | 8.28 | 7.80 | 8.02 | 8.02 | -3.02% | 510,608 |
| Oct 5, 2026 | 8.34 | 8.37 | 7.91 | 8.27 | 8.27 | -1.08% | 714,462 |
| Oct 2, 2026 | 8.62 | 8.62 | 8.35 | 8.36 | 8.36 | -2.11% | 675,839 |
| Oct 1, 2026 | 8.54 | 8.58 | 8.35 | 8.54 | 8.54 | 1.91% | 457,092 |
| Sep 30, 2026 | 8.98 | 8.99 | 8.37 | 8.38 | 8.38 | -4.56% | 634,780 |
| Sep 29, 2026 | 8.66 | 8.80 | 8.59 | 8.78 | 8.78 | 0.69% | 602,979 |
| Sep 28, 2026 | 8.25 | 8.86 | 8.07 | 8.72 | 8.72 | 5.19% | 488,859 |
| Sep 25, 2026 | 8.38 | 8.52 | 8.19 | 8.29 | 8.29 | -0.36% | 481,048 |
| Sep 24, 2026 | 8.63 | 8.73 | 8.28 | 8.32 | 8.32 | -4.15% | 426,063 |
| Sep 23, 2026 | 8.94 | 8.97 | 8.67 | 8.68 | 8.68 | -3.45% | 357,843 |
| Sep 22, 2026 | 8.72 | 9.09 | 8.70 | 8.99 | 8.99 | 5.64% | 445,500 |
| Sep 21, 2026 | 8.59 | 8.80 | 8.46 | 8.51 | 8.51 | -0.82% | 363,158 |
| Sep 18, 2026 | 8.41 | 8.60 | 8.25 | 8.58 | 8.58 | 1.42% | 1,830,892 |
| Sep 17, 2026 | 8.39 | 8.56 | 8.23 | 8.46 | 8.46 | 2.67% | 404,760 |
| Sep 16, 2026 | 8.35 | 8.50 | 8.20 | 8.24 | 8.24 | -1.08% | 398,337 |
| Sep 15, 2026 | 8.86 | 8.86 | 8.30 | 8.33 | 8.33 | -5.98% | 323,438 |
| Sep 14, 2026 | 8.95 | 8.99 | 8.79 | 8.86 | 8.86 | -0.78% | 374,872 |
| Sep 11, 2026 | 9.06 | 9.14 | 8.77 | 8.93 | 8.93 | -1.00% | 376,275 |
| Sep 10, 2026 | 9.25 | 9.26 | 8.97 | 9.02 | 9.02 | -3.01% | 310,912 |
| Sep 9, 2026 | 9.40 | 9.50 | 9.22 | 9.30 | 9.30 | -2.52% | 294,558 |
| Sep 8, 2026 | 9.60 | 9.67 | 9.35 | 9.54 | 9.54 | -2.85% | 305,440 |
| Sep 4, 2026 | 9.50 | 9.87 | 9.48 | 9.82 | 9.82 | 2.29% | 383,928 |
| Sep 3, 2026 | 9.77 | 9.78 | 9.51 | 9.60 | 9.60 | -0.88% | 277,055 |
| Sep 2, 2026 | 9.64 | 9.75 | 9.37 | 9.69 | 9.69 | 0.78% | 341,055 |
| Sep 1, 2026 | 9.28 | 9.63 | 9.26 | 9.61 | 9.61 | 2.78% | 267,669 |
| Aug 31, 2026 | 9.26 | 9.40 | 9.10 | 9.35 | 9.35 | 0.21% | 335,149 |
| Aug 28, 2026 | 9.02 | 9.48 | 8.95 | 9.33 | 9.33 | 2.64% | 498,115 |
| Aug 27, 2026 | 9.16 | 9.24 | 8.95 | 9.09 | 9.09 | -1.73% | 338,921 |
| Aug 26, 2026 | 9.40 | 9.40 | 9.15 | 9.25 | 9.25 | -1.80% | 289,040 |
| Aug 25, 2026 | 9.51 | 9.82 | 9.42 | 9.42 | 9.42 | 0.32% | 363,713 |
| Aug 24, 2026 | 9.46 | 9.49 | 9.19 | 9.39 | 9.39 | -0.63% | 248,124 |
| Aug 21, 2026 | 9.11 | 9.52 | 9.09 | 9.45 | 9.45 | 4.65% | 376,044 |
| Aug 20, 2026 | 9.13 | 9.15 | 8.71 | 9.03 | 9.03 | -2.80% | 345,968 |
| Aug 19, 2026 | 8.91 | 9.34 | 8.91 | 9.29 | 9.29 | 6.66% | 385,539 |
| Aug 18, 2026 | 8.88 | 9.00 | 8.58 | 8.71 | 8.71 | -1.91% | 248,560 |
| Aug 17, 2026 | 8.84 | 9.08 | 8.73 | 8.88 | 8.88 | 0.23% | 365,922 |
| Aug 14, 2026 | 9.04 | 9.15 | 8.84 | 8.86 | 8.86 | -2.42% | 312,600 |