Manfred Leventhal
CIK 2048816 · View on SEC EDGAR ↗
Insider
First SEC filing: May 7, 2026 · Latest: May 7, 2026
On this page
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 4 non-open-market transactions below
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
No open-market trades on record; showing all filings.
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| May 5, 2026 | ZSTK | A | 35,000 | — | — | 35,000 Direct | — | Acquired | (price as of 2026-08-19) |
| June 30, 2025 | ZSTK | A | 5,000 | — | — | 5,000 Direct | — | Acquired | (price as of 2026-08-19) |
| June 30, 2025 | ZSTK | D | 5,000 | — | — | 0 Direct | -100.00% | Disposed | (price as of 2026-08-19) |
| Dec. 15, 2024 | ZSTK | A | 5,000 | — | — | 5,000 Direct | — | Acquired | (price as of 2026-08-19) |
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 |
|---|---|---|---|---|---|---|---|
| May 5, 2026 | ZSTK | Director Stock Option ("Right to Buy") | Common Shares (35,000) | $5.10 | May 4, 2036 | 35,000 | Acquired |
| June 30, 2025 | ZSTK | Stock Appreciation Rights ("SARs") | Common Shares (5,000) | $0.58 | Dec. 15, 2034 | 5,000 | Acquired |
| June 30, 2025 | ZSTK | Stock Appreciation Rights ("SARs") | Common Shares (5,000) | $1.30 | Dec. 15, 2034 | 5,000 | Disposed |
| Dec. 15, 2024 | ZSTK | Stock Appreciation Rights ("SARs") | Common Shares (5,000) | $1.30 | Dec. 15, 2034 | 5,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).