Insider · CIK 0002078454
Fumihide Esaka
Files at AMBQ (Ambiq Micro, Inc.). First filing May 18, 2026, latest Oct 6, 2026.
In brief
Fumihide Esaka files SEC Form 4 as CEO and director at AMBQ (Ambiq Micro, Inc.). Since May 18, 2026, Fumihide Esaka has reported 0 open-market buys worth $0 and 5 open-market sells worth $16M, the latest filed on Oct 6, 2026.
A track record needs three past buys with six months of prices behind them; Fumihide Esaka has 0, so none is measured yet.
The newest scored trade: sold $1.2M of AMBQ on Oct 2, 2026, filed Oct 6, 2026, scored 65 (notable). In the last 12 months: 0 buys worth $0 and 5 sells worth $16M.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
AMBQ: Ambiq Micro, Inc.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 65Notable | Ambiq Micro, Inc. | $1.2M 16,560 shares | -4% | +200% from low-25% from high | |
| 35Weak | Ambiq Micro, Inc. | $4.0M 63,500 shares | -12% | - | |
| 35Weak | Ambiq Micro, Inc. | $6.2M 108,500 shares | -23% | +156% from low-36% from high | |
| 21Weak | Ambiq Micro, Inc. | $869k 13,500 shares | -3% | +183% from low-29% from high | |
| 55Moderate | Ambiq Micro, Inc. | $4.2M 60,000 shares | -13% | +222% from low0% from high |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Oct 2, 2026 | AMBQ AMBIQ MICRO, INC. | 16,560 0.07% of outstanding | $1.1M | Oct 2, 2026 | $11M |
| Sep 11, 2026 | AMBQ AMBIQ MICRO, INC. | 50,000 0.21% of outstanding | $3.2M | Sep 11, 2026 | $7.0M |
| Sep 2, 2026 | AMBQ AMBIQ MICRO, INC. | 11,027 0.05% of outstanding | $625k | Sep 2, 2026 | $5.6M |
| Sep 1, 2026 | AMBQ AMBIQ MICRO, INC. | 48,973 0.20% of outstanding | $2.8M | Sep 1, 2026 | $2.9M |
| Aug 31, 2026 | AMBQ AMBIQ MICRO, INC. | 35,000 0.14% of outstanding | $2.0M | Aug 31, 2026 | $869k |
| Aug 14, 2026 | AMBQ Ambiq Micro, Inc. | 45,500 0.19% of outstanding | $2.9M | Aug 14, 2026 | none |
| May 14, 2026 | AMBQ AMBIQ MICRO, INC. | 60,000 0.28% of outstanding | $4.2M | May 14, 2026 | none |
Transactions
Every row this insider has filed, 49 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Oct 2, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock | -7,113 | $69.11 | $492k | 453,347 | 8 d ago |
| Oct 2, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock | -8,585 | $69.77 | $599k | 444,762 | 8 d ago |
| Oct 2, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock | -862 | $71.86 | $62k | 443,900 | 8 d ago |
| Sep 11, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock10b5-1 | +50,000 | $12.60 | $630k | 510,460 | 29 d ago |
| Sep 11, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -42,083 | $63.27 | $2.7M | 468,377 | 29 d ago |
| Sep 11, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -7,917 | $63.86 | $506k | 460,460 | 29 d ago |
| Sep 15, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock10b5-1 | +13,500 | $8.12 | $110k | 473,960 | 29 d ago |
| Sep 15, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -3,785 | $59.56 | $225k | 470,175 | 29 d ago |
| Sep 15, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -9,615 | $60.55 | $582k | 460,560 | 29 d ago |
| Sep 15, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -100 | $61.00 | $6,100 | 460,460 | 29 d ago |
| Sep 11, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -19,007 | $0.00 | $0 | 0 | 29 d ago |
| Sep 11, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -30,993 | $0.00 | $0 | 144,279 | 29 d ago |
| Sep 15, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -13,500 | $0.00 | $0 | 58,507 | 29 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock10b5-1 | +13,500 | $8.12 | $110k | 464,689 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -5,899 | $56.87 | $335k | 458,790 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -5,501 | $57.75 | $318k | 453,289 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -2,100 | $58.52 | $123k | 451,189 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock10b5-1 | +44,271 | $12.60 | $558k | 495,460 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -15,600 | $56.81 | $886k | 479,860 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -13,800 | $57.70 | $796k | 466,060 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -5,600 | $58.46 | $327k | 460,460 | 42 d ago |
| Sep 1, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock10b5-1 | +48,973 | $12.60 | $617k | 509,433 | 42 d ago |
| Sep 1, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -48,973 | $56.39 | $2.8M | 460,460 | 42 d ago |
| Sep 2, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock10b5-1 | +11,027 | $12.60 | $139k | 471,487 | 42 d ago |
| Sep 2, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -1,452 | $56.15 | $82k | 470,035 | 42 d ago |
| Sep 2, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -9,575 | $56.77 | $544k | 460,460 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -13,500 | $0.00 | $0 | 72,007 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -35,000 | $0.00 | $0 | 79,007 | 42 d ago |
| Aug 31, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -9,271 | $0.00 | $0 | 175,272 | 42 d ago |
| Sep 1, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -48,973 | $0.00 | $0 | 30,034 | 42 d ago |
| Sep 2, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -11,027 | $0.00 | $0 | 19,007 | 42 d ago |
| Aug 14, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock10b5-1 | +13,500 | $8.12 | $110k | 464,689 | Aug 18, 2026 |
| Aug 14, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -1,282 | $63.29 | $81k | 463,407 | Aug 18, 2026 |
| Aug 14, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -10,718 | $64.40 | $690k | 452,689 | Aug 18, 2026 |
| Aug 14, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock10b5-1 | -1,500 | $65.26 | $98k | 451,189 | Aug 18, 2026 |
| Aug 14, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative10b5-1 | -13,500 | $0.00 | $0 | 85,507 | Aug 18, 2026 |
| May 14, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock | +60,000 | $8.12 | $487k | 451,189 | May 18, 2026 |
| May 14, 2026 | AMBQ Ambiq Micro, Inc. | SOpen-market sale Common Stock | -60,000 | $70.02 | $4.2M | 391,189 | May 18, 2026 |
| May 15, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock | +45,463 | $8.12 | $369k | 436,652 | May 18, 2026 |
| May 15, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock | +14,537 | $12.60 | $183k | 451,189 | May 18, 2026 |
| May 14, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative | -60,000 | $0.00 | $0 | 144,470 | May 18, 2026 |
| May 15, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative | -45,463 | $0.00 | $0 | 99,007 | May 18, 2026 |
| May 15, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative | -7,936 | $0.00 | $0 | 114,007 | May 18, 2026 |
| May 15, 2026 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative | -6,601 | $0.00 | $0 | 184,543 | May 18, 2026 |
| Mar 6, 2026 | AMBQ Ambiq Micro, Inc. | AGrant or award Common Stock | +160,616 | $0.00 | $0 | 391,189 | Apr 2, 2026 |
| Mar 6, 2026 | AMBQ Ambiq Micro, Inc. | AGrant or award Common Stock | +160,616 | $0.00 | $0 | 391,189 | Mar 10, 2026 |
| Oct 7, 2025 | AMBQ Ambiq Micro, Inc. | MOption exercise Common Stock | +53,660 | $5.88 | $316k | 230,573 | Feb 10, 2026 |
| Oct 7, 2025 | AMBQ Ambiq Micro, Inc. | MOption exercise Stock Option (Right to Buy)derivative | -53,660 | $0.00 | $0 | 0 | Feb 10, 2026 |
| Oct 2, 2025 | AMBQ Ambiq Micro, Inc. | AGrant or award Common Stock | +159,907 | $0.00 | $0 | 176,913 | Oct 6, 2025 |
Questions about Fumihide Esaka
Answered from the filings on this page, as of the latest one.
Is Fumihide Esaka buying or selling?
In the last 12 months Fumihide Esaka reported 0 open-market buys worth $0 and 5 open-market sells worth $16M on SEC Form 4; the latest was sold $1.2M of AMBQ on Oct 2, 2026. Grants, option exercises and tax withholding are not counted.
How did Fumihide Esaka's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Fumihide Esaka has 0.
Where does Fumihide Esaka file Form 4?
Fumihide Esaka has filed Form 4 at AMBQ (Ambiq Micro, Inc.) as Chief Executive Officer. A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.