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ZeroStack Corp. (NASDAQ:ZSTK)
CA · Delayed Price · Currency is USD
Financial Services · Asset Management
3.13-0.15 (-4.57%)
Insider Score
––Not scored
ZSTK Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
ZSTK Stock Insider Trading Activity
ZSTK stock’s insider trading shows 1 purchase for an estimated $3.48M and 1 sale on the open market for an estimated $7.57K by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Rong Rudy Other | Sell | 1,000 | $7.57 | $7.57K | 100% | 0 | Aug 19, 2026 | — | Form 4 |
| Heinrich Michael Director | Buy | 4,608,575 | $0.75 | $3.48M | New | 4,608,575 | Jul 20, 2026 | A+First BuyBig Buy | Form 4 |
| Reis-Faria Daniel CEO | Option exercise | 5,954,743 | $0.00 | $595.47 | New | 5,954,743 | Jul 20, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Buy (P) — Open-market or private purchase
- Sell (S) — Open-market or private sale
- Option exercise (X) — Exercise of an in- or at-the-money derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.