Tran Nguyen is CFO & CSO at PROTHENA CORP PUBLIC LTD CO (PRTA). They have made 12 open-market trades across 2 companies since 2010, most recently 2026-07-28.
CIK 0001457013
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.
3 open-market purchases totalling $104K since 2010, against 9 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 | 2023-05-17 | 2023-05-17 | $73.99 | $14.1M | -14.9% | -9.8% | -20.4% |
| PRTA | SELL | 2023-03-15 | 2023-03-17 | $48.43 | $969K | +1.6% | +10.0% | +49.8% |
| PRTA | SELL | 2023-02-15 | 2023-02-17 | $53.32 | $1.0M | -0.2% | -9.3% | +38.7% |
| PRTA | SELL | 2023-01-18 | 2023-01-20 | $55.48 | $1.1M | -1.5% | -5.8% | -2.9% |
| PRTA | SELL | 2022-12-21 | 2022-12-23 | $58.97 | $1.2M | -7.3% | -4.8% | -16.9% |
| PRTA | SELL | 2022-11-23 | 2022-11-25 | $61.09 | $1.2M | -0.9% | -5.8% | -15.3% |
| PRTA | SELL | 2022-10-19 | 2022-10-21 | $56.44 | $977K | +3.0% | +3.4% | -7.1% |
| PRTA | SELL | 2022-09-21 | 2022-09-23 | $30.75 | $308K | +89.8% | +95.3% | +92.0% |
| PRTA | SELL | 2022-08-24 | 2022-08-26 | $30.17 | $302K | +6.0% | +5.7% | +123.0% |
| PRTA | SELL | 2022-07-20 | 2022-07-22 | $32.54 | $4.6M | -0.2% | -3.6% | +81.0% |
| PRTA | BUY | 2017-03-09 | 2017-03-09 | $51.32 | $51K | -1.6% | -4.4% | -0.6% |
| PRTA | SELL · 10b5-1 | 2015-12-09 | 2015-12-11 | $66.17 | $2.0M | -31.1% | -27.6% | -49.7% |
| PRTA | BUY | 2014-05-09 | 2014-05-12 | $19.61 | $43K | -31.1% | -7.0% | -7.0% |
| SOMX | SELL · 10b5-1 | 2013-01-02 | 2013-01-03 | $3.08 | $1K | N/A | N/A | N/A |
| SOMX | SELL · 10b5-1 | 2012-01-03 | 2012-01-04 | $0.48 | $2K | N/A | N/A | N/A |
| SOMX | SELL · 10b5-1 | 2011-04-12 | 2011-04-14 | $2.84 | $9K | N/A | N/A | N/A |
| SOMX | BUY | 2010-09-15 | 2010-09-15 | $3.89 | $10K | N/A | N/A | N/A |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.