Every Form 4 that ZeroStack Corp. (ZSTK) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow ZSTK and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full ZSTK filings page.
ZeroStack Corp. (ZSTK) reported that its President, Rong Rudy, sold 1,000 Common Shares on 2026-08-19 in an open market or private transaction at $7.57 per share. Following this sale, Rudy’s directly held position in ZeroStack common stock reported in this filing is 0 shares. The transaction was not reported as made under a Rule 10b5-1 trading plan.
ZeroStack Corp. Executive Chairman Heinrich Michael acquired 4,608,575 common shares on July 20, 2026 at $0.7549 per share, paid in native blockchain tokens and held indirectly through Zero Gravity Labs Inc. He also received 500,000 employee stock options with a $5.10 exercise price, expiring May 5, 2036, vesting in five performance-based tranches tied to volume weighted average price targets after shareholder approval.
ZeroStack Corp. CEO Daniel Reis-Faria reported a grant of 500,000 employee stock options with a $5.1000 exercise price. The options were board-approved on March 5, 2026, became effective after shareholder approval on July 20, 2026, and vest in five 20% tranches tied to volume weighted average price thresholds. He also exercised 5,954,743 Pre-Funded Token Warrants at $0.0001 per share into the same number of common shares, leaving no warrants outstanding and direct holdings of 5,954,743 common shares and 500,000 options.
ZeroStack Corp. reported that CFO Vaiman Dany received a grant of 250,000 employee stock options on July 20, 2026. The options have a $5.10 exercise price, expire on May 5, 2036, and were approved by the board on March 5, 2026, subject to shareholder approval on July 20, 2026. They vest in five equal 20% installments, with each tranche contingent on ZeroStack’s volume weighted average price reaching specified thresholds.
ZeroStack Corp. director Laurence Zeifman reported a compensation-related award of options to buy 28,000 Common Shares. These director stock options have an exercise price of $5.10 per share and were granted at no cost.
The options vest in three equal installments: one-third on May 5, 2026, one-third on August 30, 2026, and one-third on December 31, 2026. Following this award, Zeifman holds 28,000 director stock options directly, with an expiration date of May 4, 2036.
ZeroStack Corp. director Edward Woo reported a compensation-related stock option grant on Common Shares. He received a Director Stock Option covering 35,000 shares, with an exercise price of $5.10 per share and an expiration date of May 4, 2036. Following this grant, he holds derivative rights over 35,000 shares directly. The options vest in three equal installments: one-third on May 5, 2026, one-third on August 30, 2026, and one-third on December 31, 2026. This Form 4 reflects an award acquisition rather than an open-market purchase or sale.
ZeroStack Corp. director Manfred Leventhal received a grant of 35,000 stock options. These Director Stock Options give him the right to buy 35,000 common shares at an exercise price of $5.10 per share and expire on May 4, 2036.
The options vest in three equal installments: one-third on May 5, 2026, one-third on August 30, 2026, and one-third on December 31, 2026. After this grant, he holds 35,000 options directly, reflecting a compensation award rather than an open-market trade.
ZeroStack Corp. Executive Chairman Heinrich Michael reported an "other" restructuring transaction involving a convertible promissory note held indirectly through Zero Gravity Labs Inc., a corporation he owns and controls. The note was tied to 4,902,220 common shares at a conversion price of $33.34 per share and had an expiration date in September 2035. A note settlement agreement provides that payment of 50,000,000 Tokens to Zero Gravity Labs Inc. fully satisfies the principal and interest, leaving no further obligations under the note and no remaining derivative holdings from this instrument.