Form 4
Open-market sale
Insider Selling
2026-10-16
AMBQ insider Hanson Scott McLean (Director, Chief Technology Officer) sold 7,000 shares (~$357.0K)
Hanson Scott McLean, listed as Director, Chief Technology Officer at Ambiq Micro, Inc., reported an open-market sale of 7,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
M |
Option exercise
|
7,000 |
$8.12 |
$56.8K |
S |
Open-market sale
|
600 |
$49.06 |
$29.4K |
S |
Open-market sale
|
900 |
$50.08 |
$45.1K |
S |
Open-market sale
|
3,700 |
$51.12 |
$189.1K |
S |
Open-market sale
|
1,800 |
$51.86 |
$93.4K |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
7,000 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: Hanson Scott McLean (Director, Chief Technology Officer)
Shares: 7,000
Est. Value: $357.0K
Form 4
Open-market sale
Insider Selling
2026-10-16
AMBQ insider Esaka Fumihide (Director, Chief Executive Officer) sold 5,000 shares (~$255.0K)
Esaka Fumihide, listed as Director, Chief Executive Officer at Ambiq Micro, Inc., reported an open-market sale of 5,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
M |
Option exercise
|
5,000 |
$8.12 |
$40.6K |
S |
Open-market sale
|
500 |
$49.13 |
$24.6K |
S |
Open-market sale
|
500 |
$50.02 |
$25.0K |
S |
Open-market sale
|
2,800 |
$51.15 |
$143.2K |
S |
Open-market sale
|
1,200 |
$51.85 |
$62.2K |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
5,000 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: Esaka Fumihide (Director, Chief Executive Officer)
Shares: 5,000
Est. Value: $255.0K
Form 4
Open-market sale
Insider Selling
2026-10-16
AMBQ insider Chen Sean Chihhsiang (President and COO) sold 15,000 shares (~$772.4K)
Chen Sean Chihhsiang, listed as President and COO at Ambiq Micro, Inc., reported an open-market sale of 15,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
M |
Option exercise
|
15,000 |
$8.12 |
$121.8K |
S |
Open-market sale
|
7,539 |
$50.13 |
$377.9K |
S |
Open-market sale
|
1,261 |
$51.53 |
$65.0K |
S |
Open-market sale
|
2,000 |
$52.47 |
$104.9K |
S |
Open-market sale
|
4,000 |
$53.44 |
$213.7K |
S |
Open-market sale
|
200 |
$54.27 |
$10.9K |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
15,000 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: Chen Sean Chihhsiang (President and COO)
Shares: 15,000
Est. Value: $772.4K
Form 4
Open-market sale
Insider Selling
2026-10-06
AMBQ insider Winzeler Jeffrey G (Chief Financial Officer) sold 5,455 shares (~$379.6K)
Winzeler Jeffrey G, listed as Chief Financial Officer at Ambiq Micro, Inc., reported an open-market sale of 5,455 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
2,343 |
$69.11 |
$161.9K |
S |
Open-market sale
|
2,828 |
$69.77 |
$197.3K |
S |
Open-market sale
|
284 |
$71.86 |
$20.4K |
Filing: Form 4 (Insider Transaction)
Insider: Winzeler Jeffrey G (Chief Financial Officer)
Shares: 5,455
Est. Value: $379.6K
Form 4
Open-market sale
Insider Selling
2026-10-06
AMBQ insider Esaka Fumihide (Director, Chief Executive Officer) sold 16,560 shares (~$1.15M)
Esaka Fumihide, listed as Director, Chief Executive Officer at Ambiq Micro, Inc., reported an open-market sale of 16,560 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
7,113 |
$69.11 |
$491.6K |
S |
Open-market sale
|
8,585 |
$69.77 |
$599.0K |
S |
Open-market sale
|
862 |
$71.86 |
$61.9K |
Filing: Form 4 (Insider Transaction)
Insider: Esaka Fumihide (Director, Chief Executive Officer)
Shares: 16,560
Est. Value: $1.15M
Form 4
Open-market sale
Insider Selling
2026-10-06
AMBQ insider Hanson Scott McLean (Director, Chief Technology Officer) sold 8,680 shares (~$604.1K)
Hanson Scott McLean, listed as Director, Chief Technology Officer at Ambiq Micro, Inc., reported an open-market sale of 8,680 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
3,728 |
$69.11 |
$257.6K |
S |
Open-market sale
|
4,500 |
$69.77 |
$314.0K |
S |
Open-market sale
|
452 |
$71.86 |
$32.5K |
Filing: Form 4 (Insider Transaction)
Insider: Hanson Scott McLean (Director, Chief Technology Officer)
Shares: 8,680
Est. Value: $604.1K
Form 4
Open-market sale
Insider Selling
2026-10-06
AMBQ insider Chen Sean Chihhsiang (President and COO) sold 14,007 shares (~$951.7K)
Chen Sean Chihhsiang, listed as President and COO at Ambiq Micro, Inc., reported an open-market sale of 14,007 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
2,492 |
$69.11 |
$172.2K |
S |
Open-market sale
|
3,008 |
$69.77 |
$209.9K |
S |
Open-market sale
|
302 |
$71.86 |
$21.7K |
S |
Open-market sale
|
5,508 |
$66.38 |
$365.6K |
S |
Open-market sale
|
1,797 |
$67.29 |
$120.9K |
S |
Open-market sale
|
800 |
$68.08 |
$54.5K |
S |
Open-market sale
|
100 |
$69.51 |
$7.0K |
Filing: Form 4 (Insider Transaction)
Insider: Chen Sean Chihhsiang (President and COO)
Shares: 14,007
Est. Value: $951.7K
Form 4
Open-market sale
Insider Selling
2026-09-17
AMBQ insider Hanson Scott McLean (Director, Chief Technology Officer) sold 7,000 shares (~$421.9K)
Hanson Scott McLean, listed as Director, Chief Technology Officer at Ambiq Micro, Inc., reported an open-market sale of 7,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
M |
Option exercise
|
7,000 |
$8.12 |
$56.8K |
S |
Open-market sale
|
1,953 |
$59.53 |
$116.3K |
S |
Open-market sale
|
4,947 |
$60.56 |
$299.6K |
S |
Open-market sale
|
100 |
$61.00 |
$6.1K |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
7,000 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: Hanson Scott McLean (Director, Chief Technology Officer)
Shares: 7,000
Est. Value: $421.9K
Form 4
Open-market sale
Insider Selling
2026-09-15
AMBQ insider ZHANG KER (Director) sold 10,000 shares (~$634.4K)
ZHANG KER, listed as Director at Ambiq Micro, Inc., reported an open-market sale of 10,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
S |
Open-market sale
|
9,100 |
$63.39 |
$576.8K |
S |
Open-market sale
|
900 |
$63.95 |
$57.6K |
Filing: Form 4 (Insider Transaction)
Insider: ZHANG KER (Director)
Shares: 10,000
Est. Value: $634.4K
Form 4
Open-market sale
Insider Selling
2026-09-15
AMBQ insider Chen Sean Chihhsiang (President and COO) sold 15,000 shares (~$902.1K)
Chen Sean Chihhsiang, listed as President and COO at Ambiq Micro, Inc., reported an open-market sale of 15,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
M |
Option exercise
|
15,000 |
$8.12 |
$121.8K |
S |
Open-market sale
|
2,600 |
$59.36 |
$154.3K |
S |
Open-market sale
|
11,000 |
$60.24 |
$662.6K |
S |
Open-market sale
|
1,400 |
$60.83 |
$85.2K |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
15,000 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: Chen Sean Chihhsiang (President and COO)
Shares: 15,000
Est. Value: $902.1K
Form 4
Open-market sale
Insider Selling
2026-09-15
AMBQ insider Esaka Fumihide (Director, Chief Executive Officer) sold 63,500 shares (~$3.98M)
Esaka Fumihide, listed as Director, Chief Executive Officer at Ambiq Micro, Inc., reported an open-market sale of 63,500 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
M |
Option exercise
|
50,000 |
$12.60 |
$630.0K |
S |
Open-market sale
|
42,083 |
$63.27 |
$2.66M |
S |
Open-market sale
|
7,917 |
$63.86 |
$505.6K |
M |
Option exercise
|
13,500 |
$8.12 |
$109.6K |
S |
Open-market sale
|
3,785 |
$59.56 |
$225.4K |
S |
Open-market sale
|
9,615 |
$60.55 |
$582.2K |
S |
Open-market sale
|
100 |
$61.00 |
$6.1K |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
19,007 |
— |
— |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
30,993 |
— |
— |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
13,500 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: Esaka Fumihide (Director, Chief Executive Officer)
Shares: 63,500
Est. Value: $3.98M
Form 4
Open-market sale
Insider Selling
2026-09-09
AMBQ insider Chen Sean Chihhsiang (President and COO) sold 15,000 shares (~$857.6K)
Chen Sean Chihhsiang, listed as President and COO at Ambiq Micro, Inc., reported an open-market sale of 15,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
M |
Option exercise
|
15,000 |
$8.12 |
$121.8K |
S |
Open-market sale
|
12,874 |
$57.09 |
$734.9K |
S |
Open-market sale
|
2,126 |
$57.68 |
$122.6K |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
15,000 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: Chen Sean Chihhsiang (President and COO)
Shares: 15,000
Est. Value: $857.6K
Form 4
Open-market sale
Insider Selling
2026-09-09
AMBQ insider ZHANG KER (Director) sold 185 shares (~$10.5K)
ZHANG KER, listed as Director at Ambiq Micro, Inc., reported an open-market sale of 185 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Transactions reported on this filing
| Code |
Nature |
Shares |
Price |
Value |
M |
Option exercise
|
1,785 |
$5.88 |
$10.5K |
S |
Open-market sale
|
185 |
$56.92 |
$10.5K |
M |
Option exercise
derivative · Stock Option (Right to Buy)
|
1,785 |
— |
— |
Filing: Form 4 (Insider Transaction)
Insider: ZHANG KER (Director)
Shares: 185
Est. Value: $10.5K