Tzu Yin Chiu is Director at AXCELIS TECHNOLOGIES INC (ACLS). They have made 3 open-market trades across 1 company since 2023, most recently 2026-05-15.
CIK 0001738290
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 3 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| ACLS | 11,843 | $1.1M |
Shares reported on the most recent Form 4, priced at the 2026-05-18 close.
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.