Mika Nishimura is Director at SI-BONE, Inc. (SIBN). They have made 2 open-market trades across 1 company since 2024, most recently 2026-06-04.
CIK 0001848327
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 2 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| SIBN | 43,673 | $859K |
| ARAY | 212,659 | $33K |
| Total | $892K |
Shares reported on the most recent Form 4, priced at the 2026-06-08 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.