AMBQ.NYSEAmbiq Micro, INC
Form 4: Ambiq Micro CEO Sells Shares
Sentiment:
Insider Transaction (Form 4)
Fumihide Esaka, Chief Executive Officer and a Director of Ambiq Micro, Inc., sold 108,500 shares of common stock on August 31, 2026.
Summary
- Option exercise/conversion: acquired 13,500 Common Stock at $8.12 ($109,620) on August 31, 2026; holds 464,689 after (Direct).
- Open-market sale: disposed of 5,899 Common Stock at $56.87 ($335,453) on August 31, 2026; holds 458,790 after (Direct).
- Open-market sale: disposed of 5,501 Common Stock at $57.75 ($317,709) on August 31, 2026; holds 453,289 after (Direct).
- Open-market sale: disposed of 2,100 Common Stock at $58.52 ($122,889) on August 31, 2026; holds 451,189 after (Direct).
- Option exercise/conversion: acquired 44,271 Common Stock at $12.60 ($557,815) on August 31, 2026; holds 495,460 after (Direct).
- Open-market sale: disposed of 15,600 Common Stock at $56.81 ($886,219) on August 31, 2026; holds 479,860 after (Direct).
- Open-market sale: disposed of 13,800 Common Stock at $57.70 ($796,277) on August 31, 2026; holds 466,060 after (Direct).
- Open-market sale: disposed of 5,600 Common Stock at $58.46 ($327,359) on August 31, 2026; holds 460,460 after (Direct).
- Option exercise/conversion: acquired 48,973 Common Stock at $12.60 ($617,060) on September 1, 2026; holds 509,433 after (Direct).
- Open-market sale: disposed of 48,973 Common Stock at $56.39 ($2,761,534) on September 1, 2026; holds 460,460 after (Direct).
- Option exercise/conversion: acquired 11,027 Common Stock at $12.60 ($138,940) on September 2, 2026; holds 471,487 after (Direct).
- Open-market sale: disposed of 1,452 Common Stock at $56.15 ($81,534) on September 2, 2026; holds 470,035 after (Direct).
- Open-market sale: disposed of 9,575 Common Stock at $56.77 ($543,574) on September 2, 2026; holds 460,460 after (Direct).
- Option exercise/conversion: disposed of 13,500 Stock Option (Right to Buy) on August 31, 2026; holds 72,007 after (Direct).
- Option exercise/conversion: disposed of 35,000 Stock Option (Right to Buy) on August 31, 2026; holds 79,007 after (Direct).
- Option exercise/conversion: disposed of 9,271 Stock Option (Right to Buy) on August 31, 2026; holds 175,272 after (Direct).
- Option exercise/conversion: disposed of 48,973 Stock Option (Right to Buy) on September 1, 2026; holds 30,034 after (Direct).
- Option exercise/conversion: disposed of 11,027 Stock Option (Right to Buy) on September 2, 2026; holds 19,007 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $6,172,546 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Fumihide Esaka — Director, Officer (Chief Executive Officer)
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-08-31 | Option exercise/conversion | Common Stock | 13,500 | $8 | $109.6K | 464,689 |
| 2026-08-31 | Open-market sale | Common Stock | 5,899 | $57 | $335.5K | 458,790 |
| 2026-08-31 | Open-market sale | Common Stock | 5,501 | $58 | $317.7K | 453,289 |
| 2026-08-31 | Open-market sale | Common Stock | 2,100 | $59 | $122.9K | 451,189 |
| 2026-08-31 | Option exercise/conversion | Common Stock | 44,271 | $13 | $557.8K | 495,460 |
| 2026-08-31 | Open-market sale | Common Stock | 15,600 | $57 | $886.2K | 479,860 |
| 2026-08-31 | Open-market sale | Common Stock | 13,800 | $58 | $796.3K | 466,060 |
| 2026-08-31 | Open-market sale | Common Stock | 5,600 | $58 | $327.4K | 460,460 |
| 2026-09-01 | Option exercise/conversion | Common Stock | 48,973 | $13 | $617.1K | 509,433 |
| 2026-09-01 | Open-market sale | Common Stock | 48,973 | $56 | $2.8M | 460,460 |
| 2026-09-02 | Option exercise/conversion | Common Stock | 11,027 | $13 | $138.9K | 471,487 |
| 2026-09-02 | Open-market sale | Common Stock | 1,452 | $56 | $81.5K | 470,035 |
| 2026-09-02 | Open-market sale | Common Stock | 9,575 | $57 | $543.6K | 460,460 |
| 2026-08-31 | Option exercise/conversion | Stock Option (Right to Buy) | 13,500 | — | — | 72,007 |
| 2026-08-31 | Option exercise/conversion | Stock Option (Right to Buy) | 35,000 | — | — | 79,007 |
| 2026-08-31 | Option exercise/conversion | Stock Option (Right to Buy) | 9,271 | — | — | 175,272 |
| 2026-09-01 | Option exercise/conversion | Stock Option (Right to Buy) | 48,973 | — | — | 30,034 |
| 2026-09-02 | Option exercise/conversion | Stock Option (Right to Buy) | 11,027 | — | — | 19,007 |
Key Dates
| Date | Description |
|---|---|
| 2026-08-31 | Option exercise/conversion (13,500 shares) |
| 2026-08-31 | Open-market sale (5,899 shares) |
| 2026-08-31 | Open-market sale (5,501 shares) |
| 2026-08-31 | Open-market sale (2,100 shares) |
| 2026-08-31 | Option exercise/conversion (44,271 shares) |
| 2026-08-31 | Open-market sale (15,600 shares) |
| 2026-08-31 | Open-market sale (13,800 shares) |
| 2026-08-31 | Open-market sale (5,600 shares) |
| 2026-09-01 | Option exercise/conversion (48,973 shares) |
| 2026-09-01 | Open-market sale (48,973 shares) |
| 2026-09-02 | Option exercise/conversion (11,027 shares) |
| 2026-09-02 | Open-market sale (1,452 shares) |
| 2026-09-02 | Open-market sale (9,575 shares) |
| 2026-08-31 | Option exercise/conversion (13,500 shares) |
| 2026-08-31 | Option exercise/conversion (35,000 shares) |
| 2026-08-31 | Option exercise/conversion (9,271 shares) |
| 2026-09-01 | Option exercise/conversion (48,973 shares) |
| 2026-09-02 | Option exercise/conversion (11,027 shares) |
Keywords
insider transaction, Form 4, AMBQ, Ambiq Micro, Inc., bearish, Fumihide Esaka
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