Prothena Corporation plc (PRTA)
Showing Closing Date Range from Jul 21 to Oct 19, 2026 compared to Apr 21 to Jul 20, 2026.
Compare Last 3 Months with Previous Period
Investor Relations:ir.prothena.com
Current Period Close
$8.48
Jul 21, 2026 - Oct 19, 2026
Previous Period Close
$8.67
Apr 21, 2026 - Jul 20, 2026
Net Comparison Delta
$-0.19 (-2.19%)
Relative performance vs prior benchmark
Historical Quotes & Breakdown(60 dates)
| Current Date | Current Close | Previous Date | Previous Close | Delta (%) |
|---|---|---|---|---|
| Oct 19, 2026 | $8.48 | Jul 16, 2026 | $8.47 | +0.12% |
| Oct 16, 2026 | $8.35 | Jul 15, 2026 | $8.43 | -0.95% |
| Oct 15, 2026 | $8.50 | Jul 14, 2026 | $8.64 | -1.62% |
| Oct 14, 2026 | $8.37 | Jul 13, 2026 | $8.83 | -5.21% |
| Oct 13, 2026 | $8.36 | Jul 10, 2026 | $9.24 | -9.52% |
| Oct 12, 2026 | $8.43 | Jul 09, 2026 | $9.64 | -12.55% |
| Oct 09, 2026 | $8.84 | Jul 08, 2026 | $9.85 | -10.25% |
| Oct 08, 2026 | $8.61 | Jul 07, 2026 | $9.68 | -11.05% |
| Oct 07, 2026 | $8.48 | Jul 06, 2026 | $9.50 | -10.74% |
| Oct 06, 2026 | $8.02 | Jul 02, 2026 | $9.69 | -17.23% |
| Oct 05, 2026 | $8.27 | Jul 01, 2026 | $9.58 | -13.67% |
| Oct 02, 2026 | $8.36 | Jun 30, 2026 | $9.79 | -14.61% |
| Sep 25, 2026 | $8.29 | Jun 29, 2026 | $9.97 | -16.85% |
| Sep 24, 2026 | $8.32 | Jun 26, 2026 | $10.02 | -16.97% |
| Sep 23, 2026 | $8.68 | Jun 25, 2026 | $9.27 | -6.36% |
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