LYTIR

Company · ZSTK

ZeroStack Corp.

Nasdaq's symbol directory lists ZSTK on Nasdaq as “ZeroStack Corp. - Common Stock”.

In the 12 months to Nov 8, 2026: insiders bought on 1 occasion ($3.5M); insiders sold on 1 occasion ($8K); 6 filings by holders of 5% or more; 1 company report (Form 8-K, since May 26, 2026).

All insider filings at the SEC

Insider purchases and sales, by month (last 12 months)Insider purchases: $3.5M in total; Insider sales: $8K in total.Jul: Insider purchases $3.5MAug: Insider sales $8KDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $3.5MInsider sales below: $8K
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. Michael Heinrich, Executive Chairman bought on 1 day latest Jul 20, 2026 bought $3.5M
  2. Rong Rudy, President sold on 1 day latest Aug 19, 2026 sold $8K
Every trade (2)
  1. SELLRong Rudy, President sold Aug 19, 2026 1,000 shares filing $8K
  2. BUYMichael Heinrich, Executive Chairman bought Jul 20, 2026 4,608,575 shares filing $3.5M

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. Hack VC Management, LLC filed Oct 19, 2026 Schedule 13G passive filing 8.6%
  2. BLOCKCAT PTE. LTD. filed Sep 4, 2026 Schedule 13G passive 1,750,000 shares filing 8.3%
  3. Puple AI Inc. filed Sep 2, 2026 Schedule 13G passive 1,750,000 shares filing 8.3%
  4. Reis-Faria Daniel filed Jul 21, 2026 Schedule 13D/A may seek influence 6,925,951 shares filing 37.5%
  5. Heinrich Michael filed Jul 21, 2026 Schedule 13D/A may seek influence 5,579,783 shares filing 30.2%
  6. Vaiman Dany filed Jul 21, 2026 Schedule 13D/A may seek influence 513,249 shares filing 2.9%

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Entry into a material definitive agreement; Termination of a material definitive agreement; Departure or appointment of directors or officers filing Nov 2, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.