David Allen Stamler
Insider
First SEC filing: April 15, 2026 · Latest: April 15, 2026
Insider at
Insider transactions
1 buys (P)
0 sells (S)
Net: $23,810
Avg return of open purchases vs now: 668.0%
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 31, 2026 | ATHE | P | 47,620 | $0.50 | $23,810 | 0 Direct | -100.00% | Disposed | 668.0% (price as of 2026-09-14) |
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 |
|---|---|---|---|---|---|---|---|
| Aug. 31, 2026 | ATHE | Listed option exp 31 Aug 2026 | Ordinary shares | $0.50 | Aug. 31, 2026 | 47,620 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 6 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| April 15, 2026 | ATHE | Ordinary shares | 11,688,312 | Direct |
| April 15, 2026 | ATHE | American Depositary Shares (1:600 ordinary shares) | 139,258 | Indirect |
| April 15, 2026 | ATHE | Listed option exp 26 Feb 2027 | 1,515,152 | Direct |
| April 15, 2026 | ATHE | Listed option exp 31 August 2026 | 2,380,952 | Direct |
| April 15, 2026 | ATHE | Unlisted option exp 21 March 2029 | 40,000,200 | Direct |
| April 15, 2026 | ATHE | Unlisted option exp 8 August 2030 | 290,400,000 | Direct |