Chi-Hong Ju
CIK 1882831 · View on SEC EDGAR ↗
Insider
First SEC filing: Sept. 14, 2021 · Latest: June 18, 2026
On this page
Insider at
Insider transactions
0 buys (P)
11 sells (S)
Net:
$-3,897,118
+ 52 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
52 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| July 1, 2026 | AMBA | S | 10,000 | $88.84 | $888,400 | 155,924 Direct | -6.03% | Disposed | -17.7% (price as of 2026-08-21) |
| June 17, 2026 | AMBA | S | 2,017 | $67.87 | $136,894 | 165,924 Direct | -1.20% | Disposed | 7.7% (price as of 2026-08-21) |
| March 19, 2026 | AMBA | S | 2,155 | $54.14 | $116,672 | 167,941 Direct | -1.27% | Disposed | 35.0% (price as of 2026-08-21) |
| March 17, 2026 | AMBA | S | 4,729 | $52.77 | $249,549 | 164,166 Direct | -2.80% | Disposed | 38.5% (price as of 2026-08-21) |
| Jan. 5, 2026 | AMBA | S | 7,728 | $75.58 | $584,082 | 146,039 Direct | -5.03% | Disposed | -3.3% (price as of 2026-08-21) |
| Dec. 30, 2025 | AMBA | S | 7,945 | $70.25 | $558,136 | 149,587 Direct | -5.04% | Disposed | 4.1% (price as of 2026-08-21) |
| Dec. 30, 2025 | AMBA | S | 3,765 | $70.32 | $264,755 | 153,767 Direct | -2.39% | Disposed | 4.0% (price as of 2026-08-21) |
| Dec. 17, 2025 | AMBA | S | 1,342 | $71.82 | $96,382 | 157,532 Direct | -0.84% | Disposed | 1.8% (price as of 2026-08-21) |
| Oct. 14, 2025 | AMBA | S | 6,156 | $80.96 | $498,390 | 158,874 Direct | -3.73% | Disposed | -9.7% (price as of 2026-08-21) |
| Oct. 13, 2025 | AMBA | S | 5,057 | $81.29 | $411,084 | 165,030 Direct | -2.97% | Disposed | -10.1% (price as of 2026-08-21) |
| Sept. 17, 2025 | AMBA | S | 1,168 | $79.43 | $92,774 | 170,087 Direct | -0.68% | Disposed | -8.0% (price as of 2026-08-21) |
| June 17, 2025 | AMBA | S | 1,108 | $52.26 | $57,904 | 171,032 Direct | -0.64% | Disposed | 39.9% (price as of 2026-08-21) |
| March 18, 2025 | AMBA | S | 1,034 | $55.02 | $56,891 | 172,140 Direct | -0.60% | Disposed | 32.9% (price as of 2026-08-21) |
| March 6, 2025 | AMBA | S | 1,859 | $55.11 | $102,449 | 172,940 Direct | -1.06% | Disposed | 32.7% (price as of 2026-08-21) |
| Dec. 16, 2024 | AMBA | S | 1,048 | $75.41 | $79,030 | 157,638 Direct | -0.66% | Disposed | -3.0% (price as of 2026-08-21) |
| Dec. 9, 2024 | AMBA | S | 2,118 | $75.69 | $160,311 | 161,686 Direct | -1.29% | Disposed | -3.4% (price as of 2026-08-21) |
| Dec. 9, 2024 | AMBA | S | 3,000 | $75.72 | $227,160 | 158,686 Direct | -1.86% | Disposed | -3.4% (price as of 2026-08-21) |
| Sept. 17, 2024 | AMBA | S | 1,050 | $53.54 | $56,217 | 172,397 Direct | -0.61% | Disposed | 36.6% (price as of 2026-08-21) |
| June 26, 2024 | AMBA | S | 6,000 | $52.90 | $317,400 | 173,193 Direct | -3.35% | Disposed | 38.2% (price as of 2026-08-21) |
| June 21, 2024 | AMBA | S | 8,900 | $55.53 | $494,217 | 179,193 Direct | -4.73% | Disposed | 31.7% (price as of 2026-08-21) |
| June 18, 2024 | AMBA | S | 1,059 | $55.48 | $58,753 | 179,193 Direct | -0.59% | Disposed | 31.8% (price as of 2026-08-21) |
| June 10, 2024 | AMBA | S | 1,895 | $57.50 | $108,962 | 180,252 Direct | -1.04% | Disposed | 27.1% (price as of 2026-08-21) |
| June 7, 2024 | AMBA | S | 2,296 | $56.79 | $130,390 | 182,147 Direct | -1.24% | Disposed | 28.7% (price as of 2026-08-21) |
| March 18, 2024 | AMBA | S | 778 | $49.27 | $38,332 | 184,443 Direct | -0.42% | Disposed | 48.4% (price as of 2026-08-21) |
| March 8, 2024 | AMBA | S | 509 | $57.16 | $29,094 | 185,003 Direct | -0.27% | Disposed | 27.9% (price as of 2026-08-21) |
| Dec. 19, 2023 | AMBA | S | 1,074 | $63.04 | $67,705 | 168,390 Direct | -0.63% | Disposed | 16.0% (price as of 2026-08-21) |
| Sept. 18, 2023 | AMBA | S | 1,048 | $57.30 | $60,050 | 169,464 Direct | -0.61% | Disposed | 27.6% (price as of 2026-08-21) |
| July 7, 2023 | AMBA | S | 4,251 | $81.81 | $347,774 | 170,349 Direct | -2.43% | Disposed | -10.6% (price as of 2026-08-21) |
| June 20, 2023 | AMBA | S | 1,015 | $84.80 | $86,072 | 174,600 Direct | -0.58% | Disposed | -13.8% (price as of 2026-08-21) |
| June 8, 2023 | AMBA | S | 4,165 | $82.62 | $344,112 | 157,801 Direct | -2.57% | Disposed | -11.5% (price as of 2026-08-21) |
| March 17, 2023 | AMBA | S | 4,402 | $76.85 | $338,294 | 161,966 Direct | -2.65% | Disposed | -4.9% (price as of 2026-08-21) |
| Dec. 22, 2022 | AMBA | S | 2,000 | $81.16 | $162,320 | 153,689 Direct | -1.28% | Disposed | -9.9% (price as of 2026-08-21) |
| Dec. 19, 2022 | AMBA | S | 764 | $80.46 | $61,471 | 155,689 Direct | -0.49% | Disposed | -9.1% (price as of 2026-08-21) |
| Dec. 16, 2022 | AMBA | S | 1,262 | $83.77 | $105,718 | 156,453 Direct | -0.80% | Disposed | -12.7% (price as of 2026-08-21) |
| Sept. 16, 2022 | AMBA | S | 1,272 | $63.25 | $80,454 | 155,230 Direct | -0.81% | Disposed | 15.6% (price as of 2026-08-21) |
| June 16, 2022 | AMBA | S | 1,340 | $66.26 | $88,788 | 153,875 Direct | -0.86% | Disposed | 10.3% (price as of 2026-08-21) |
| March 16, 2022 | AMBA | S | 14,598 | $91.20 | $1,331,338 | 152,732 Direct | -8.72% | Disposed | -19.8% (price as of 2026-08-21) |
| March 14, 2022 | AMBA | S | 1,315 | $84.42 | $111,012 | 135,833 Direct | -0.96% | Disposed | -13.4% (price as of 2026-08-21) |
| Dec. 30, 2021 | AMBA | S | 536 | $206.11 | $110,475 | 134,537 Direct | -0.40% | Disposed | -64.5% (price as of 2026-08-21) |
| Dec. 27, 2021 | AMBA | S | 402 | $209.98 | $84,412 | 135,073 Direct | -0.30% | Disposed | -65.2% (price as of 2026-08-21) |
| Dec. 16, 2021 | AMBA | S | 1,595 | $188.90 | $301,296 | 135,475 Direct | -1.16% | Disposed | -61.3% (price as of 2026-08-21) |
| Dec. 7, 2021 | AMBA | S | 500 | $220.81 | $110,405 | 133,675 Direct | -0.37% | Disposed | -66.9% (price as of 2026-08-21) |
| Dec. 7, 2021 | AMBA | S | 500 | $223.00 | $111,500 | 133,175 Direct | -0.37% | Disposed | -67.2% (price as of 2026-08-21) |
| Dec. 3, 2021 | AMBA | S | 1,495 | $192.69 | $288,072 | 134,175 Direct | -1.10% | Disposed | -62.1% (price as of 2026-08-21) |
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 |
|---|---|---|---|---|---|---|---|
| March 17, 2026 | AMBA | Performance Stock Units | Ordinary Shares (9,553) | — | March 15, 2026 | 9,553 | Disposed |
| March 2, 2026 | AMBA | Performance Stock Units | Ordinary Shares (17,329) | — | March 15, 2029 | 17,329 | Acquired |
| Feb. 28, 2025 | AMBA | Performance Stock Units | Ordinary Shares (12,388) | — | March 15, 2028 | 12,388 | Acquired |
| June 21, 2024 | AMBA | Non-Qualified Stock Option (right to buy) | Ordinary Shares (8,900) | $38.92 | Sept. 7, 2024 | 8,900 | Disposed |
| Feb. 29, 2024 | AMBA | Performance Stock Units | Ordinary Shares (15,898) | — | — | 15,898 | Acquired |
| April 3, 2023 | AMBA | Performance Stock Units | Ordinary Shares (9,553) | — | March 15, 2026 | 9,553 | Acquired |
| March 15, 2023 | AMBA | Performance Stock Units | Ordinary Shares (14,338) | — | March 15, 2023 | 14,338 | Disposed |
| March 15, 2023 | AMBA | Restricted Stock Units | Ordinary Shares (1,195) | — | March 15, 2023 | 1,195 | Disposed |
| March 15, 2023 | AMBA | Restricted Stock Units | Ordinary Shares (513) | — | March 15, 2024 | 513 | Disposed |
| March 15, 2023 | AMBA | Restricted Stock Units | Restricted Stock Units (775) | — | March 15, 2025 | 775 | Disposed |
| March 2, 2023 | AMBA | Restricted Stock Units | Ordinary Shares (9,553) | — | — | 9,553 | Acquired |
| Dec. 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (1,195) | — | March 15, 2023 | 1,195 | Disposed |
| Dec. 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (514) | — | March 15, 2024 | 514 | Disposed |
| Dec. 16, 2022 | AMBA | Restricted Stock Units | Restricted Stock Units (776) | — | March 15, 2025 | 776 | Disposed |
| Sept. 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (1,195) | — | March 15, 2023 | 1,195 | Disposed |
| Sept. 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (514) | — | March 15, 2024 | 514 | Disposed |
| Sept. 16, 2022 | AMBA | Restricted Stock Units | Restricted Stock Units (776) | — | March 15, 2025 | 776 | Disposed |
| June 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (1,195) | — | March 15, 2023 | 1,195 | Disposed |
| June 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (513) | — | March 15, 2024 | 513 | Disposed |
| June 16, 2022 | AMBA | Restricted Stock Units | Restricted Stock Units (775) | — | March 15, 2025 | 775 | Disposed |
| April 11, 2022 | AMBA | Performance Stock Units | Ordinary Shares (9,308) | — | March 15, 2025 | 9,308 | Acquired |
| April 11, 2022 | AMBA | Restricted Stock Units | Restricted Stock Units (9,308) | — | March 15, 2025 | 9,308 | Acquired |
| March 16, 2022 | AMBA | Performance Stock Units | Ordinary Shares (14,259) | — | March 15, 2022 | 14,259 | Disposed |
| March 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (1,189) | — | March 15, 2022 | 1,189 | Disposed |
| March 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (1,195) | — | March 15, 2023 | 1,195 | Disposed |
| March 16, 2022 | AMBA | Restricted Stock Units | Ordinary Shares (514) | — | March 15, 2024 | 514 | Disposed |
| Dec. 16, 2021 | AMBA | Restricted Stock Units | Ordinary Shares (1,188) | — | March 15, 2022 | 1,188 | Disposed |
| Dec. 16, 2021 | AMBA | Restricted Stock Units | Ordinary Shares (1,194) | — | March 15, 2023 | 1,194 | Disposed |
| Dec. 16, 2021 | AMBA | Restricted Stock Units | Ordinary Shares (513) | — | March 15, 2024 | 513 | Disposed |
| Sept. 16, 2021 | AMBA | Restricted Stock Units | Ordinary Shares (1,188) | — | March 15, 2022 | 1,188 | Disposed |
| Sept. 16, 2021 | AMBA | Restricted Stock Units | Ordinary Shares (1,195) | — | March 15, 2023 | 1,195 | Disposed |
| Sept. 16, 2021 | AMBA | Restricted Stock Units | Ordinary Shares (514) | — | March 15, 2024 | 514 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 8 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Sept. 14, 2021 | AMBA | Ordinary Shares | 132,665 | Direct |
| Sept. 14, 2021 | AMBA | Non-Qualified Stock Option (right to buy)→ Ordinary Shares (8,900) | 8,900 | Direct |
| Sept. 14, 2021 | AMBA | Performance Stock Units→ Ordinary Shares (14,259) | 14,259 | Direct |
| Sept. 14, 2021 | AMBA | Performance Stock Units→ Ordinary Shares (14,338) | 14,338 | Direct |
| Sept. 14, 2021 | AMBA | Performance Stock Units→ Ordinary Shares (6,163) | 6,163 | Direct |
| Sept. 14, 2021 | AMBA | Restricted Stock Units→ Ordinary Shares (3,565) | 3,565 | Direct |
| Sept. 14, 2021 | AMBA | Restricted Stock Units→ Ordinary Shares (8,364) | 8,364 | Direct |
| Sept. 14, 2021 | AMBA | Restricted Stock Units→ Ordinary Shares (5,650) | 5,650 | Direct |