| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Director | Chief Executive Officer | See Remarks
1 company
Kang Sun is Director at AMPX. Kang Sun's net worth is not public. Form 4 filings only show shares in the companies where this person is an insider; those holdings are worth an estimated $10.8M at current prices.
Our model assigns Kang Sun a below-average insider score of 33/100, based on 17 past trades. Over a 12-month horizon, none of those trades were profitable, with an average 12-month return of -86.7%.
The AMPX filings lean toward selling, a net 4,750,517 shares.
Kang Sun has 21 Form 4 filings on record from September 2022 to August 2026, all as Director at Amprius Technologies, Inc. WT (AMPX), 2022–2026.
The 46 reported transactions were 20 open-market sales, 12 option exercises, 11 option or other derivative awards and 3 stock awards.
Counted by filing, the open-market trades come to no purchases and 16 sales worth about $58.5M.
The largest open-market sale was 1,500,000 shares of AMPX at an average $15.91 on April 1, 2026, about $23.9M.
None of the 16 sales since April 2023 was marked as made under a Rule 10b5-1 trading plan.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 21, 2026 | AMPX Amprius Technologies, Inc. Wt | Director | Sell | 62,101 | $10.34 | $642,186.44 | -4.8% | - | - | |
| May 27, 2026 | AMPX Amprius Technologies, Inc. Wt | Director | Sell | 356 | $17.19 | $6,120.89 | - | -40.7% | - | |
| May 21, 2026 | AMPX Amprius Technologies, Inc. | Director | Sell | 67,796 | $14.79 | $1,002,594.37 | -5.0% | -30.5% | - | |
| Apr 1, 2026 | AMPX Amprius Technologies, Inc. | Director | Sale+OE | 1,500,000 | $15.91 | $23,860,713.75 | -52.8% | -10.7% | - | |
| Mar 23, 2026 | AMPX Amprius Technologies, Inc. Wt | Director | Sell | 217,869 | $18.80 | $4,095,401.63 | -79.4% | -16.2% | - | |
| Feb 23, 2026 | AMPX Amprius Technologies, Inc. | Director | Sell | 61,251 | $10.16 | $622,034.53 | -4.4% | +74.8% | - | |
| Jan 20, 2026 | AMPX Amprius Technologies, Inc. | Director | Sale+OE | 993,733 | $11.06 | $10,994,943.52 | -41.5% | +75.6% | - | |
| Jan 12, 2026 | AMPX Amprius Technologies, Inc. | Director | Sale+OE | 506,267 | $10.10 | $5,111,474.14 | -26.5% | +83.7% | - | |
| Nov 21, 2025 | AMPX Amprius Technologies, Inc. | Chief Executive Officer | Sell | 68,655 | $10.08 | $692,131.65 | -4.7% | +2.4% | - | |
| Nov 17, 2025 | AMPX Amprius Technologies, Inc. | Chief Executive Officer | Sale+OE | 1,000,000 | $10.60 | $10,595,300.00 | -40.4% | -6.3% | - |