Kang Sun
CIK 1476220 · View on SEC EDGAR ↗
First SEC filing: May 28, 2026 · Latest: May 28, 2026
On this page
Insider at
Insider transactions
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 |
|---|---|---|---|---|---|---|---|---|---|
| May 27, 2026 | AMPX | S | 356 | $17.19 | $6,121 | 1,280,498 | — | — | -39.3% (price as of 2026-08-20) |
| May 21, 2026 | AMPX | S | 67,796 | $14.79 | $1,002,594 | 1,280,854 | — | — | -29.4% (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 |
|---|---|---|---|---|---|---|---|
| Sept. 14, 2022 | AMPX | Stock Option (right to buy) | Common Stock (545,962) | $2.61 | April 13, 2032 | 545,962 | Acquired |
| Sept. 14, 2022 | AMPX | Stock Option (right to buy) | Common Stock (727,950) | $2.61 | April 13, 2032 | 727,950 | Acquired |
| Sept. 14, 2022 | AMPX | Stock Option (right to buy) | Common Stock (1,455,901) | $1.78 | June 16, 2031 | 1,455,901 | Acquired |
| Sept. 14, 2022 | AMPX | Stock Option (right to buy) | Common Stock (727,950) | $0.05 | March 15, 2024 | 727,950 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $633,000 | $680,475 | $1,318,680 | — | — | — | $600 | $2,632,755 |
| 2024 | $624,000 | $624,000 | $3,833,109 | $573,800 | — | — | $600 | $5,655,509 |
| 2023 | $624,000 | $624,000 | — | — | — | — | $690 | $1,248,690 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.