Robert G. Zack is Director at ARK Venture Fund (ARKVX). They have made 2 open-market trades across 2 companies since 2022, most recently 2025-06-30.
CIK 0001496362
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.
1 open-market purchase totalling $5K since 2022, against 1 sale. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| XARKX | 254 | — |
Shares reported on the most recent Form 4, priced at the 2022-10-17 close. 1 holding could not be priced and is excluded from the total.
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.