Latest filingSep 02, 2026Most recent Form 4
AMBQ
Ambiq Micro, Inc.
NYSETechnologySemiconductors & Related Devices
Insider activity for last month from 08/03 to 09/03. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$1.07B18 sells
Net open-market-$1.07B2 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period37transactions
- M · Option exercise · dominant19 · 51%
- S · Open-market sells18 · 49%
Activity by reported role
A joint filing can contribute to multiple roles37transactions
- Chief executive officer · dominant23 · 62%
- CTO14 · 38%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (2)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeEsaka FumihideCommon Stock · Direct
470,035Sep 02, 2026
Hanson Scott McLeanCommon Stock · Direct
221,226Aug 27, 2026
Esaka FumihideStock Option (Right to Buy) · Direct
19,007Sep 02, 2026
Hanson Scott McLeanStock Option (Right to Buy) · Direct
83,558Aug 27, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 03 → Sep 03
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Top insiders
By absolute net value across the selected period- EF-$5.5M
- HM-$393.8k
Recent filing activity
Most recent 12 transactions · color = transaction code- MOption exercise09/02$0SEC
- MOption exercise09/02$0SEC
- MOption exercise09/02$0SEC
- MOption exercise09/02$0SEC
- MOption exercise09/02$0SEC
- SSell09/02-$54.3MSEC
- SSell09/02-$8.15MSEC
- MOption exercise09/02$13.8MSEC
- SSell09/02-$276MSEC
- MOption exercise09/02$61.7MSEC
- SSell09/02-$32.7MSEC
- SSell09/02-$79.6MSEC
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
AMBQ transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 11.0k | $0 | M | — | 0.0% | 09/02 | 09/02 |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 48.9k | $0 | M | — | 0.0% | 09/02 | 09/01 |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 9.27k | $0 | M | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 35.0k | $0 | M | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 13.5k | $0 | M | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 9.57k | -$54.3M | S | — | 0.0% | 09/02 | 09/02 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 1.45k | -$8.15M | S | — | 0.0% | 09/02 | 09/02 |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 11.0k | $13.8M | M | — | 0.0% | 09/02 | 09/02 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 48.9k | -$276M | S | — | 0.0% | 09/02 | 09/01 |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 48.9k | $61.7M | M | — | 0.0% | 09/02 | 09/01 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 5.60k | -$32.7M | S | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 13.8k | -$79.6M | S | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 15.6k | -$88.6M | S | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 44.2k | $55.7M | M | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 2.10k | -$12.2M | S | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 5.50k | -$31.7M | S | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 5.89k | -$33.5M | S | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 13.5k | $10.9M | M | — | 0.0% | 09/02 | 08/31 |
| AMBQ | Hanson Scott McLean | CTO | exercise10b5-1 | 7.00k | $0 | M | −11.2% | 08/18 | 08/14 | |
| AMBQ | Hanson Scott McLean | CTO | sale10b5-1 | 800 | -$5.22M | S | −11.2% | 08/18 | 08/14 | |
| AMBQ | Hanson Scott McLean | CTO | sale10b5-1 | 5.40k | -$34.7M | S | −11.2% | 08/18 | 08/14 | |
| AMBQ | Hanson Scott McLean | CTO | sale10b5-1 | 800 | -$5.06M | S | −11.2% | 08/18 | 08/14 | |
| AMBQ | Hanson Scott McLean | CTO | exercise10b5-1 | 7.00k | $5.68M | M | −11.2% | 08/18 | 08/14 | |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 13.5k | $0 | M | −11.2% | 08/18 | 08/14 | |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 1.50k | -$9.78M | S | −11.2% | 08/18 | 08/14 | |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 10.7k | -$69.0M | S | −11.2% | 08/18 | 08/14 | |
| AMBQ | Esaka Fumihide | CEO | sale10b5-1 | 1.28k | -$8.11M | S | −11.2% | 08/18 | 08/14 | |
| AMBQ | Esaka Fumihide | CEO | exercise10b5-1 | 13.5k | $10.9M | M | −11.2% | 08/18 | 08/14 |
Ambiq Micro, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Ambiq Micro, Inc.?
Esaka Fumihide, Hanson Scott McLean.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Esaka Fumihide reported a sale on Sep 02, 2026 valued at $54.3M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $10,775,489.13. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.