Ambiq CEO sells 13,500 shares after option exercise
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Form Type
4
Rhea-AI Filing Summary
Ambiq Micro, Inc. (AMBQ) reported that Chief Executive Officer Fumihide Esaka exercised stock options for 13,500 shares of common stock at an exercise price of $8.12 per share and on the same date sold 13,500 shares in multiple open-market transactions at weighted average prices between approximately $62.66 and $65.56 per share. After the option exercise, Esaka held 85,507 stock options directly. All transactions occurred on August 14, 2026 under a Rule 10b5-1 plan adopted on May 15, 2026.
Insider Trade Summary 10b5-1
Exercise and Sale: 13,500 shares ($760K approx. pre-tax spread)
Exercise and Sale
5 txns
Insider
Esaka Fumihide
Role
Chief Executive Officer
Sold
13,500 shs ($869K)
Approx. gross sale proceeds
$869K
Approx. exercise cost
$110K
Approx. pre-tax spread
$760K
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option (Right to Buy) F1, F5 | 13,500 | $0.00 | $0.00 |
| Exercise | Common Stock F1 | 13,500 | $8.12 | $110K |
| Sale | Common Stock F1, F2 | 1,282 | $63.2857 | $81K |
| Sale | Common Stock F1, F3 | 10,718 | $64.3964 | $690K |
| Sale | Common Stock F1, F4 | 1,500 | $65.2621 | $98K |
Holdings After Transaction:
Stock Option (Right to Buy) — 85,507 contracts (Direct);
Common Stock — 451,189 shares (Direct)
Footnotes (5)
- F1. The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on May 15, 2026.
- F2. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $62.66 to $63.64 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F3. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $63.71 to $64.70 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F4. The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $64.92 to $65.56 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
- F5. 1/4 of the shares subject to the option vested on February 21, 2020, and 1/48 of the shares subject to the option vested in equal monthly installments thereafter, subject to the Reporting Person's continued service.
Key Figures
Options Exercised: 13,500 shares
Exercise Price: $8.12 per share
Shares Sold Tranche 1: 1,282 shares at $63.2857 per share
+5 more
8 metrics
Options Exercised
13,500 shares
Stock options for AMBQ common stock exercised on August 14, 2026
Exercise Price
$8.12 per share
Exercise price of stock options converted into 13,500 common shares
Shares Sold Tranche 1
1,282 shares at $63.2857 per share
Weighted average sale price; trades between $62.66 and $63.64
Shares Sold Tranche 2
10,718 shares at $64.3964 per share
Weighted average sale price; trades between $63.71 and $64.70
Shares Sold Tranche 3
1,500 shares at $65.2621 per share
Weighted average sale price; trades between $64.92 and $65.56
Remaining Options
85,507 shares
Stock options held directly by Esaka after the reported exercise
Option Expiration Date
February 20, 2029
Expiration of the stock option from which 13,500 shares were exercised
10b5-1 Plan Adoption
May 15, 2026
Date Esaka adopted the Rule 10b5-1 trading plan governing these trades
Key Terms
Rule 10b5-1 plan, weighted average sale price, Stock Option (Right to Buy), derivative security, +1 more
5 terms
Rule 10b5-1 plan regulatory
"The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan"
A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.
weighted average sale price financial
"The reported price in Column 4 is a weighted average sale price"
Stock Option (Right to Buy) financial
"security_title: Stock Option (Right to Buy)"
derivative security financial
"Exercise or conversion of derivative security"
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
vesting financial
"1/4 of the shares subject to the option vested on February 21, 2020"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What did AMBQ CEO Fumihide Esaka do in this Form 4 transaction?
Esaka exercised 13,500 stock options for Ambiq Micro (AMBQ) common shares at $8.12 per share, then sold 13,500 shares in multiple open-market trades at weighted average prices between about $62.66 and $65.56 per share.
What stock options did the AMBQ CEO exercise in this filing?
Esaka exercised 13,500 stock options for Ambiq Micro common stock at an exercise price of $8.12 per share. These options were part of a grant vesting quarterly since February 21, 2020, and the option expires on February 20, 2029.
How many Ambiq Micro (AMBQ) stock options does the CEO hold after these transactions?
Following the reported exercise, Esaka directly holds 85,507 Ambiq Micro stock options. This figure reflects the remaining options tied to the reported award after 13,500 options were exercised on August 14, 2026, as disclosed in the filing data.
Were the AMBQ CEO’s trades made under a Rule 10b5-1 trading plan?
Yes. The transactions were executed under a Rule 10b5-1 plan adopted by Esaka on May 15, 2026. Such plans allow pre-arranged trading, which can reduce the informational content of trade timing for outside investors analyzing insider activity.
AI-generated analysis. How Rhea-AI works. Not financial advice.
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