Heinrich Michael

CIK 2093136 · View on SEC EDGAR ↗

Activist

First SEC filing: April 2, 2026 · Latest: April 2, 2026

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Insider at

Insider transactions

1 buys (P) 0 sells (S) Net: $3,456,431 + 4 non-open-market transactions below Avg return of open purchases vs now: 546.7% last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

4 other filings hidden
Date Ticker Code Shares Price Value Owned after Δ own A/D vs now
July 20, 2026 ZSTK P 4,608,575 $0.75 $3,456,431 4,608,575 Indirect — Acquired 546.7% (price as of 2026-08-20)

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date Ticker Security Underlying Exercise price Expiration Shares A/D
July 20, 2026 ZSTK Employee Stock Option (Right to Buy) Common Shares (500,000) $5.10 May 5, 2036 500,000 Acquired
March 31, 2026 ZSTK Convertible Promissory Note Common Shares (4,902,220) $33.34 Sept. 22, 2035 4,902,220 Disposed
Dec. 19, 2025 ZSTK Director Stock Option (Right to Buy) Common Shares (471,208) $7.31 Dec. 18, 2035 471,208 Acquired
Oct. 23, 2025 ZSTK Convertible Promissory Note Common Shares $33.34 Sept. 22, 2035 4,902,220 Acquired

Exercise/conversion price is blank when not applicable (e.g. RSUs).