ZSTK
ZeroStack Corp. · Wholesale Trade · Market cap $84.7M
Insiders bought $3.5M net in the last 90 days ·1 seller, 1 buyer· latest Form 4 filed Aug 21, 2026
Insider Buying
$3.5M
reported purchases (SEC code P)
Insider Selling
$8K
reported sales (SEC code S)
Unique Insiders
2
in the rolling window
Latest filing
Aug 21, 2026
Rong Rudy
ZeroStack Corp. (ZSTK) has 2 SEC Form 4 filings (2 transaction rows) in the rolling window, disclosed by 2 distinct insiders. Most recent filing: Aug 21, 2026.
Inside the rolling window, 2 insiders at ZeroStack Corp. reported 1 open-market purchase totaling $3.5M and 1 open-market sale totaling $8K. Insiders have net bought $3.5M over the trailing 6 months. The largest single insider purchase in this window was $3.5M by Executive Chairman Heinrich Michael on Jul 20, 2026. The most recent open-market filing is a sale of 1,000 shares by President Rong Rudy, dated Aug 19, 2026, worth $8K.
- Industry:Medical - Distribution
- CEO:Daniel Reis-Faria
- Employees:21
- HQ:Toronto, ON, CA
- IPO:2021-05-11
| Source | |||||||
|---|---|---|---|---|---|---|---|
Rong RudyFirst filing | President | Sale | 1,000 | $8K | Aug 21 | +2.8% | SEC ↗ |
Heinrich MichaelFirst filing | Executive Chairman | Purchase | 4,608,575 | $3.5M | Jul 20 | +193.3% | SEC ↗ |
Earnings: last 7 quarters
Frequently asked questions
How many SEC Form 4 insider filings does ZSTK have?
ZeroStack Corp. (ZSTK) has 2 SEC Form 4 filings (2 transaction rows) in the rolling 365-day window, disclosed by 2 distinct insiders. Most recent filing: Aug 21, 2026.
When was the most recent SEC Form 4 filing for ZSTK?
The most recent Form 4 filing for ZSTK on Tracefour is dated Aug 21, 2026.
What is the net insider flow at ZSTK over the last 6 months?
Over the trailing 180 days, insiders at ZSTK have net bought $3.5M based on SEC Form 4 disclosures.
What was the largest insider purchase at ZSTK?
The largest single insider open-market purchase at ZSTK in the rolling window was $3.5M by Executive Chairman Heinrich Michael on 2026-07-20.
What is the total insider buy and sell value at ZSTK in the current window?
Inside the rolling window, insiders at ZSTK bought $3.5M and sold $8K based on SEC Form 4 filings.
Can I get alerts for ZSTK insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at ZeroStack Corp. (ZSTK). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
ZeroStack Corp. is in the Wholesale Trade sector.