Prothena Corporation plc (PRTA)
NASDAQ: PRTA · Real-Time Price · USD
9.14
+0.05 (0.55%)
Feb 19, 2026, 3:10 PM EST - Market open
Prothena Corporation Stock Price History
Historical Data
| Date | Open | High | Low | Close | Adj. Close | Change | Volume |
|---|---|---|---|---|---|---|---|
| Feb 19, 2026 | 9.06 | 9.14 | 8.80 | 9.03 | - | -0.66% | 129,195 |
| Feb 18, 2026 | 8.81 | 9.23 | 8.81 | 9.09 | 9.09 | 1.45% | 305,229 |
| Feb 17, 2026 | 8.96 | 9.21 | 8.80 | 8.96 | 8.96 | - | 374,772 |
| Feb 13, 2026 | 8.85 | 9.24 | 8.85 | 8.96 | 8.96 | 1.24% | 290,008 |
| Feb 12, 2026 | 8.93 | 9.04 | 8.72 | 8.85 | 8.85 | -0.90% | 333,923 |
| Feb 11, 2026 | 9.01 | 9.09 | 8.65 | 8.93 | 8.93 | -0.33% | 271,111 |
| Feb 10, 2026 | 8.81 | 9.12 | 8.77 | 8.96 | 8.96 | 1.13% | 329,528 |
| Feb 9, 2026 | 8.90 | 9.04 | 8.59 | 8.86 | 8.86 | -0.56% | 356,096 |
| Feb 6, 2026 | 8.58 | 8.99 | 8.56 | 8.91 | 8.91 | 6.71% | 581,028 |
| Feb 5, 2026 | 8.86 | 9.05 | 8.23 | 8.35 | 8.35 | -6.07% | 518,973 |
| Feb 4, 2026 | 8.77 | 9.04 | 8.48 | 8.89 | 8.89 | 1.25% | 451,551 |
| Feb 3, 2026 | 8.90 | 9.05 | 8.61 | 8.78 | 8.78 | -1.46% | 280,865 |
| Feb 2, 2026 | 8.79 | 8.95 | 8.39 | 8.91 | 8.91 | 1.14% | 556,572 |
| Jan 30, 2026 | 8.98 | 9.07 | 8.65 | 8.81 | 8.81 | -2.76% | 389,955 |
| Jan 29, 2026 | 9.15 | 9.50 | 8.95 | 9.06 | 9.06 | -0.88% | 362,299 |
| Jan 28, 2026 | 9.69 | 9.78 | 9.10 | 9.14 | 9.14 | -6.06% | 411,568 |
| Jan 27, 2026 | 9.92 | 10.09 | 9.68 | 9.73 | 9.73 | -2.11% | 391,846 |
| Jan 26, 2026 | 9.94 | 10.26 | 9.77 | 9.94 | 9.94 | -0.60% | 470,287 |
| Jan 23, 2026 | 10.30 | 10.53 | 9.99 | 10.00 | 10.00 | -3.29% | 659,527 |
| Jan 22, 2026 | 9.68 | 10.35 | 9.67 | 10.34 | 10.34 | 6.82% | 512,235 |
| Jan 21, 2026 | 9.28 | 9.72 | 9.24 | 9.68 | 9.68 | 4.65% | 591,125 |
| Jan 20, 2026 | 9.12 | 9.55 | 9.00 | 9.25 | 9.25 | -1.07% | 630,848 |
| Jan 16, 2026 | 9.29 | 9.45 | 8.94 | 9.35 | 9.35 | 0.97% | 740,512 |
| Jan 15, 2026 | 9.16 | 9.28 | 8.91 | 9.26 | 9.26 | 0.65% | 601,967 |
| Jan 14, 2026 | 8.94 | 9.26 | 8.84 | 9.20 | 9.20 | 2.45% | 398,465 |
| Jan 13, 2026 | 8.77 | 9.06 | 8.77 | 8.98 | 8.98 | 0.79% | 470,366 |
| Jan 12, 2026 | 9.16 | 9.16 | 8.65 | 8.91 | 8.91 | -3.05% | 585,586 |
| Jan 9, 2026 | 9.19 | 9.34 | 9.11 | 9.19 | 9.19 | 1.55% | 401,916 |
| Jan 8, 2026 | 9.03 | 9.16 | 8.95 | 9.05 | 9.05 | -0.88% | 375,982 |
| Jan 7, 2026 | 9.00 | 9.47 | 8.96 | 9.13 | 9.13 | 1.78% | 467,536 |
| Jan 6, 2026 | 9.01 | 9.14 | 8.89 | 8.97 | 8.97 | -1.43% | 636,208 |
| Jan 5, 2026 | 9.24 | 9.24 | 8.92 | 9.10 | 9.10 | -1.09% | 539,121 |
| Jan 2, 2026 | 9.56 | 9.69 | 9.07 | 9.20 | 9.20 | -3.66% | 526,643 |
| Dec 31, 2025 | 9.30 | 9.56 | 9.24 | 9.55 | 9.55 | 2.58% | 466,240 |
| Dec 30, 2025 | 9.45 | 9.52 | 9.29 | 9.31 | 9.31 | -1.79% | 353,433 |
| Dec 29, 2025 | 9.49 | 9.55 | 9.34 | 9.48 | 9.48 | -0.63% | 493,479 |
| Dec 26, 2025 | 9.67 | 9.67 | 9.43 | 9.54 | 9.54 | -1.55% | 422,345 |
| Dec 24, 2025 | 9.46 | 9.74 | 9.23 | 9.69 | 9.69 | 2.11% | 236,347 |
| Dec 23, 2025 | 9.53 | 9.59 | 9.29 | 9.49 | 9.49 | -1.96% | 702,990 |
| Dec 22, 2025 | 9.16 | 9.78 | 9.07 | 9.68 | 9.68 | 5.10% | 685,146 |
| Dec 19, 2025 | 9.38 | 9.56 | 9.11 | 9.21 | 9.21 | -1.81% | 4,034,524 |
| Dec 18, 2025 | 9.46 | 9.67 | 9.32 | 9.38 | 9.38 | -0.53% | 525,538 |
| Dec 17, 2025 | 9.78 | 9.91 | 9.39 | 9.43 | 9.43 | -3.28% | 508,027 |
| Dec 16, 2025 | 9.95 | 10.16 | 9.52 | 9.75 | 9.75 | -2.21% | 638,928 |
| Dec 15, 2025 | 10.37 | 10.50 | 9.94 | 9.97 | 9.97 | -3.76% | 852,645 |
| Dec 12, 2025 | 10.40 | 10.49 | 10.20 | 10.36 | 10.36 | 0.29% | 477,695 |
| Dec 11, 2025 | 9.93 | 10.50 | 9.81 | 10.33 | 10.33 | 4.66% | 693,399 |
| Dec 10, 2025 | 10.28 | 10.32 | 9.69 | 9.87 | 9.87 | -4.36% | 961,391 |
| Dec 9, 2025 | 10.70 | 10.80 | 10.23 | 10.32 | 10.32 | -3.82% | 532,153 |
| Dec 8, 2025 | 11.20 | 11.30 | 10.71 | 10.73 | 10.73 | -3.07% | 561,870 |