Total buying$00 buys
AMBQ
Ambiq Micro, Inc.
NYSETechnologySemiconductors & Related Devices
Insider activity for last month from 09/19 to 10/19.
How these metrics are calculated
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 selling$4.47M29 sells
Net open-market−$4.47MBuying minus selling
Active insiders4Distinct reporting owners
Insider activity report
Calendar-month buckets within the selected date range
Latest filing: Oct 16, 2026
Open-market transaction mix · 29 transactions in the selected period
Code A includes awards, grants and other acquisitions; these are not open-market buys. A rolling period can include partial calendar months.
View exact monthly counts and disclosed values
| Month | Buys | Sells | Awards (A) | Buy value | Sell value | Net P/S value |
|---|---|---|---|---|---|---|
| Sep 2026 | 0 | 0 | 0 | $0 | $0 | $0 |
| Oct 2026 | 0 | 29 | 0 | $0 | $4.47M | -$4.47M |
Distinct insiders active
Reporting-owner CIKs by month · peak Oct 2026 (4)Sep 2026Oct 2026
Largest insider activity
By absolute net disclosed value · current transaction page- CC-$650.6k
- HM-$300.2k
- EF-$214.4k
- WG-$20.4k
AMBQ transaction history
Newest filings · 20 transactions per pageLatest insider transactions
Form 4 filings from last month.Filing-only signals
Deterministic matches in the selected period
Filing detail checks
Secondary metrics for the selected periodTransaction codes
By Form 4 transaction code in selected period35transactionstxns
- S · Open-market sells · dominant29 · 83%
- M · Option exercise6 · 17%
Activity by reported role
A joint filing can contribute to multiple rolesPRES14
Chief executive officer9
CTO9
Chief financial officer3
Reported Holdings After
Separated by insider, security, and ownership type
Chen Sean ChihhsiangCommon Stock · Direct
106,268Oct 14, 2026
Hanson Scott McLeanCommon Stock · Direct
212,546Oct 15, 2026
Esaka FumihideCommon Stock · Direct
443,900Oct 15, 2026
Winzeler Jeffrey GCommon Stock · Direct
100,844Oct 02, 2026
Chen Sean ChihhsiangStock Option (Right to Buy) · Direct
119,423Oct 14, 2026
Esaka FumihideStock Option (Right to Buy) · Direct
53,507Oct 15, 2026
Hanson Scott McLeanStock Option (Right to Buy) · Direct
38,279Oct 15, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Current transaction page only · each cell is a filing date · buys green, sells redSep 19 → Oct 19
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Ambiq Micro, Inc. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at Ambiq Micro, Inc.?
Hanson Scott McLean, Esaka Fumihide, Chen Sean Chihhsiang, Winzeler Jeffrey G.
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?
Hanson Scott McLean reported a sale on Oct 15, 2026 valued at $93.3k. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $4,472,448.17. 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.