Fumihide Esaka
Insider
First SEC filing: July 29, 2025 · Latest: July 29, 2025
Insider at
Insider transactions
0 buys (P)
18 sells (S)
Net: $-15,224,974
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 |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 15, 2026 | AMBQ | M 10b5-1 | 13,500 | $8.12 | $109,620 | 473,960 Direct | +2.93% | Acquired | 711.8% (price as of 2026-10-05) |
| Sept. 15, 2026 | AMBQ | S 10b5-1 | 3,785 | $59.56 | $225,435 | 470,175 Direct | -0.80% | Disposed | 10.7% (price as of 2026-10-05) |
| Sept. 15, 2026 | AMBQ | S 10b5-1 | 9,615 | $60.55 | $582,188 | 460,560 Direct | -2.04% | Disposed | 8.9% (price as of 2026-10-05) |
| Sept. 15, 2026 | AMBQ | S 10b5-1 | 100 | $61.00 | $6,100 | 460,460 Direct | -0.02% | Disposed | 8.1% (price as of 2026-10-05) |
| Sept. 15, 2026 | AMBQ | M 10b5-1 | 13,500 | · | · | 58,507 Direct | -18.75% | Disposed | (price as of 2026-10-05) |
| Sept. 11, 2026 | AMBQ | M | 50,000 | $12.60 | $630,000 | 510,460 Direct | +10.86% | Acquired | 423.2% (price as of 2026-10-05) |
| Sept. 11, 2026 | AMBQ | S 10b5-1 | 42,083 | $63.27 | $2,662,591 | 468,377 Direct | -8.24% | Disposed | 4.2% (price as of 2026-10-05) |
| Sept. 11, 2026 | AMBQ | S 10b5-1 | 7,917 | $63.86 | $505,580 | 460,460 Direct | -1.69% | Disposed | 3.2% (price as of 2026-10-05) |
| Sept. 11, 2026 | AMBQ | M | 19,007 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Sept. 11, 2026 | AMBQ | M | 30,993 | · | · | 144,279 Direct | -17.68% | Disposed | (price as of 2026-10-05) |
| Sept. 2, 2026 | AMBQ | M | 11,027 | $12.60 | $138,940 | 471,487 Direct | +2.39% | Acquired | 423.2% (price as of 2026-10-05) |
| Sept. 2, 2026 | AMBQ | S 10b5-1 | 1,452 | $56.15 | $81,530 | 470,035 Direct | -0.31% | Disposed | 17.4% (price as of 2026-10-05) |
| Sept. 2, 2026 | AMBQ | S 10b5-1 | 9,575 | $56.77 | $543,573 | 460,460 Direct | -2.04% | Disposed | 16.1% (price as of 2026-10-05) |
| Sept. 2, 2026 | AMBQ | M | 11,027 | · | · | 19,007 Direct | -36.72% | Disposed | (price as of 2026-10-05) |
| Sept. 1, 2026 | AMBQ | M | 48,973 | $12.60 | $617,060 | 509,433 Direct | +10.64% | Acquired | 423.2% (price as of 2026-10-05) |
| Sept. 1, 2026 | AMBQ | S 10b5-1 | 48,973 | $56.39 | $2,761,587 | 460,460 Direct | -9.61% | Disposed | 16.9% (price as of 2026-10-05) |
| Sept. 1, 2026 | AMBQ | M | 48,973 | · | · | 30,034 Direct | -61.99% | Disposed | (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | M 10b5-1 | 13,500 | $8.12 | $109,620 | 464,689 Direct | +2.99% | Acquired | 711.8% (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | S 10b5-1 | 5,899 | $56.87 | $335,476 | 458,790 Direct | -1.27% | Disposed | 15.9% (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | S 10b5-1 | 5,501 | $57.75 | $317,683 | 453,289 Direct | -1.20% | Disposed | 14.1% (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | S 10b5-1 | 2,100 | $58.52 | $122,892 | 451,189 Direct | -0.46% | Disposed | 12.6% (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | M | 44,271 | $12.60 | $557,815 | 495,460 Direct | +9.81% | Acquired | 423.2% (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | S 10b5-1 | 15,600 | $56.81 | $886,236 | 479,860 Direct | -3.15% | Disposed | 16.0% (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | S 10b5-1 | 13,800 | $57.70 | $796,260 | 466,060 Direct | -2.88% | Disposed | 14.2% (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | S 10b5-1 | 5,600 | $58.46 | $327,376 | 460,460 Direct | -1.20% | Disposed | 12.8% (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | M 10b5-1 | 13,500 | · | · | 72,007 Direct | -15.79% | Disposed | (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | M | 35,000 | · | · | 79,007 Direct | -30.70% | Disposed | (price as of 2026-10-05) |
| Aug. 31, 2026 | AMBQ | M | 9,271 | · | · | 175,272 Direct | -5.02% | Disposed | (price as of 2026-10-05) |
| Aug. 14, 2026 | AMBQ | M 10b5-1 | 13,500 | $8.12 | $109,620 | 464,689 Direct | +2.99% | Acquired | 711.8% (price as of 2026-10-05) |
| Aug. 14, 2026 | AMBQ | S 10b5-1 | 1,282 | $63.29 | $81,138 | 463,407 Direct | -0.28% | Disposed | 4.2% (price as of 2026-10-05) |
| Aug. 14, 2026 | AMBQ | S 10b5-1 | 10,718 | $64.40 | $690,239 | 452,689 Direct | -2.31% | Disposed | 2.4% (price as of 2026-10-05) |
| Aug. 14, 2026 | AMBQ | S 10b5-1 | 1,500 | $65.26 | $97,890 | 451,189 Direct | -0.33% | Disposed | 1.0% (price as of 2026-10-05) |
| Aug. 14, 2026 | AMBQ | M 10b5-1 | 13,500 | · | · | 85,507 Direct | -13.64% | Disposed | (price as of 2026-10-05) |
| May 15, 2026 | AMBQ | M | 45,463 | $8.12 | $369,160 | 436,652 Direct | +11.62% | Acquired | 711.8% (price as of 2026-10-05) |
| May 15, 2026 | AMBQ | M | 14,537 | $12.60 | $183,166 | 451,189 Direct | +3.33% | Acquired | 423.2% (price as of 2026-10-05) |
| May 15, 2026 | AMBQ | M | 45,463 | · | · | 99,007 Direct | -31.47% | Disposed | (price as of 2026-10-05) |
| May 15, 2026 | AMBQ | M | 7,936 | · | · | 114,007 Direct | -6.51% | Disposed | (price as of 2026-10-05) |
| May 15, 2026 | AMBQ | M | 6,601 | · | · | 184,543 Direct | -3.45% | Disposed | (price as of 2026-10-05) |
| May 14, 2026 | AMBQ | M | 60,000 | $8.12 | $487,200 | 451,189 Direct | +15.34% | Acquired | 711.8% (price as of 2026-10-05) |
| May 14, 2026 | AMBQ | S | 60,000 | $70.02 | $4,201,200 | 391,189 Direct | -13.30% | Disposed | -5.9% (price as of 2026-10-05) |
| May 14, 2026 | AMBQ | M | 60,000 | · | · | 144,470 Direct | -29.34% | Disposed | (price as of 2026-10-05) |
| March 6, 2026 | AMBQ | A | 160,616 | · | · | 391,189 Direct | +69.66% | Acquired | (price as of 2026-10-05) |
| March 6, 2026 | AMBQ | A | 160,616 | · | · | 391,189 Direct | +69.66% | Acquired | (price as of 2026-10-05) |
| Oct. 7, 2025 | AMBQ | M | 53,660 | $5.88 | $315,521 | 230,573 Direct | +30.33% | Acquired | 1021.1% (price as of 2026-10-05) |
| Oct. 7, 2025 | AMBQ | M | 53,660 | · | · | 0 Direct | -100.00% | Disposed | (price as of 2026-10-05) |
| Oct. 2, 2025 | AMBQ | A | 159,907 | · | · | 176,913 Direct | +940.30% | Acquired | (price as of 2026-10-05) |
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. 15, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $8.12 | Feb. 20, 2029 | 13,500 | Disposed |
| Sept. 11, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $12.60 | May 25, 2031 | 19,007 | Disposed |
| Sept. 11, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $12.60 | July 20, 2034 | 30,993 | Disposed |
| Sept. 2, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $12.60 | May 25, 2031 | 11,027 | Disposed |
| Sept. 1, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $12.60 | May 25, 2031 | 48,973 | Disposed |
| Aug. 31, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $8.12 | Feb. 20, 2029 | 13,500 | Disposed |
| Aug. 31, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $12.60 | May 25, 2031 | 35,000 | Disposed |
| Aug. 31, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $12.60 | July 20, 2034 | 9,271 | Disposed |
| Aug. 14, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $8.12 | Feb. 20, 2029 | 13,500 | Disposed |
| May 15, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $8.12 | Feb. 20, 2029 | 45,463 | Disposed |
| May 15, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $12.60 | May 25, 2031 | 7,936 | Disposed |
| May 15, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $12.60 | July 20, 2034 | 6,601 | Disposed |
| May 14, 2026 | AMBQ | Stock Option (Right to Buy) | Common Stock | $8.12 | Feb. 20, 2029 | 60,000 | Disposed |
| Oct. 7, 2025 | AMBQ | Stock Option (Right to Buy) | Common Stock | $5.88 | Jan. 11, 2026 | 53,660 | Disposed |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 5 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| July 29, 2025 | AMBQ | Common Stock | 17,006 | Direct |
| July 29, 2025 | AMBQ | Stock Option (Right to Buy) | 53,660 | Direct |
| July 29, 2025 | AMBQ | Stock Option (Right to Buy) | 204,470 | Direct |
| July 29, 2025 | AMBQ | Stock Option (Right to Buy) | 121,943 | Direct |
| July 29, 2025 | AMBQ | Stock Option (Right to Buy) | 191,144 | Direct |
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 | $832,166 | $513,800 | · | · | · | · | $179,298 | $6,271,304 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.