Karin L. Walker is CAO at PROTHENA CORP PUBLIC LTD CO (PRTA). They have made 18 open-market trades across 1 company since 2014, most recently 2026-07-28.
CIK 0001559422
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 18 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| PRTA | SELL · 10b5-1 | 2024-01-24 | 2024-01-24 | $34.00 | $170K | -24.2% | -17.7% | -37.8% |
| PRTA | SELL · 10b5-1 | 2023-12-20 | 2023-12-20 | $37.19 | $372K | +1.3% | -12.0% | -33.2% |
| PRTA | SELL · 10b5-1 | 2023-11-30 | 2023-11-30 | $34.00 | $170K | +4.3% | +18.7% | -10.7% |
| PRTA | SELL · 10b5-1 | 2023-10-25 | 2023-10-25 | $41.00 | $398K | -5.4% | -12.1% | -10.8% |
| PRTA | SELL · 10b5-1 | 2023-09-19 | 2023-09-19 | $52.36 | $262K | -8.8% | -15.7% | -30.7% |
| PRTA | SELL · 10b5-1 | 2023-08-18 | 2023-08-18 | $57.18 | $286K | -4.2% | -7.5% | -39.2% |
| PRTA | SELL · 10b5-1 | 2023-07-19 | 2023-07-19 | $69.19 | $692K | +3.7% | -14.5% | -29.0% |
| PRTA | SELL · 10b5-1 | 2023-06-20 | 2023-06-20 | $69.09 | $516K | -2.1% | -5.0% | -24.7% |
| PRTA | SELL · 10b5-1 | 2023-05-19 | 2023-05-19 | $74.00 | $740K | -10.3% | -5.2% | -21.6% |
| PRTA | SELL · 10b5-1 | 2023-04-19 | 2023-04-21 | $52.89 | $529K | +22.0% | +32.4% | +20.5% |
| PRTA | SELL | 2023-03-20 | 2023-03-22 | $47.72 | $477K | +2.4% | +14.7% | +47.6% |
| PRTA | SELL | 2023-03-15 | 2023-03-17 | $48.41 | $1.9M | +1.6% | +10.0% | +49.8% |
| PRTA | SELL | 2022-11-18 | 2022-11-18 | $57.05 | $1.1M | +5.3% | -2.2% | -9.2% |
| PRTA | SELL | 2022-10-24 | 2022-10-26 | $57.23 | $2.3M | -9.1% | -0.2% | -8.9% |
| PRTA | SELL | 2021-11-23 | 2021-11-26 | $58.04 | $368K | -0.5% | -4.8% | -30.6% |
| PRTA | SELL | 2021-10-20 | 2021-10-22 | $60.40 | $1.5M | -3.5% | -4.1% | -42.4% |
| PRTA | SELL | 2017-09-28 | 2017-09-29 | $70.00 | $105K | -5.7% | -10.6% | -41.3% |
| PRTA | SELL | 2017-07-17 | 2017-07-19 | $65.02 | $559K | -7.9% | -18.6% | -10.1% |
| PRTA | SELL | 2017-04-17 | 2017-04-19 | $52.24 | $256K | +4.6% | +9.0% | +22.3% |
| PRTA | SELL | 2017-04-17 | 2017-04-19 | $52.25 | $261K | +4.6% | +9.0% | +22.3% |
| PRTA | SELL | 2016-10-13 | 2016-10-14 | $54.13 | $222K | -4.1% | +26.1% | -5.8% |
| PRTA | SELL | 2016-10-13 | 2016-10-14 | $54.31 | $320K | -4.1% | +26.1% | -5.8% |
| PRTA | SELL | 2016-09-19 | 2016-09-21 | $61.10 | $733K | -4.7% | -13.1% | -17.3% |
| PRTA | SELL | 2016-09-19 | 2016-09-21 | $61.15 | $703K | -4.7% | -13.1% | -17.3% |
| PRTA | SELL | 2016-04-13 | 2016-04-15 | $45.17 | $271K | -6.1% | -8.5% | -2.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.