Michael J. Malecek is CLO at PROTHENA CORP PUBLIC LTD CO (PRTA). They have made 5 open-market trades across 1 company since 2021, most recently 2025-07-28.
CIK 0001779336
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 5 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| PRTA | 80,000 | $669K |
Shares reported on the most recent Form 4, priced at the 2025-07-30 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| PRTA | SELL · 10b5-1 | 2023-09-27 | 2023-09-27 | $47.33 | $454K | -0.1% | -24.7% | -15.3% |
| PRTA | SELL · 10b5-1 | 2023-08-30 | 2023-08-30 | $55.01 | $549K | +2.0% | -11.1% | -40.2% |
| PRTA | SELL · 10b5-1 | 2023-07-26 | 2023-07-26 | $62.26 | $584K | -0.4% | -14.7% | -32.9% |
| PRTA | SELL · 10b5-1 | 2023-06-28 | 2023-06-28 | $69.82 | $698K | -3.2% | -4.2% | -31.6% |
| PRTA | SELL · 10b5-1 | 2023-05-31 | 2023-05-31 | $64.54 | $600K | +9.9% | +2.8% | -15.4% |
| PRTA | SELL · 10b5-1 | 2023-04-26 | 2023-04-28 | $53.45 | $267K | +42.9% | +22.7% | +21.9% |
| PRTA | SELL · 10b5-1 | 2023-03-29 | 2023-03-31 | $49.02 | $490K | +7.2% | +11.5% | +42.2% |
| PRTA | SELL | 2023-03-15 | 2023-03-17 | $48.44 | $1.5M | +1.6% | +10.0% | +49.8% |
| PRTA | SELL | 2022-11-30 | 2022-12-02 | $61.97 | $516K | -10.7% | -17.6% | -18.4% |
| PRTA | SELL | 2022-10-26 | 2022-10-28 | $60.54 | $9.1M | -15.7% | -8.1% | -9.5% |
| PRTA | SELL | 2021-11-19 | 2021-11-19 | $55.00 | $550K | -14.1% | -19.7% | -39.3% |
| PRTA | SELL | 2021-10-27 | 2021-10-29 | $58.46 | $996K | +1.7% | -10.7% | -43.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.