SEC Form 4
Ambiq Micro, Inc. (AMBQ) insider trading
In the 12 months to Oct 26, 2026, 8 AMBQ insiders reported open-market sales of $36.4M across 22 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $36.4M
- 22 filings · 8 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 11 of 22
- $15.6M of $36.4M sold (43%)
Who traded AMBQ, and when
- Sale
- Sale, pre-arranged (10b5-1)
AMBQ daily close from Oct 27, 2025 to Oct 26, 2026, between $22.76 and $90.48, last $51.82. 22 sale and 0 purchase filings by 8 insiders, marked at their filing dates. Fumihide Esaka, Chief Executive Officer: sold $15.5M across 5 filings, first filed May 18, 2026, last Oct 16, 2026. Sean Chihhsiang Chen, President and COO: sold $7.0M across 5 filings, first filed May 18, 2026, last Oct 16, 2026. Timothy Chen, Director: sold $5.6M across 1 filing, first filed May 29, 2026, last May 29, 2026. Scott McLean Hanson, Chief Technology Officer: sold $5.5M across 6 filings, first filed Jan 28, 2026, last Oct 16, 2026. Jeffrey G. Winzeler, Chief Financial Officer: sold $1.8M across 1 filing, first filed May 18, 2026, last May 18, 2026. Ker Zhang, Director: sold $644.9K across 2 filings, first filed Sep 9, 2026, last Sep 15, 2026. 2 others: sold $263.0K across 2 filings, first filed Jan 28, 2026, last Apr 6, 2026.
Largest mark · tap a row for others
Fumihide Esaka · Chief Executive Officer
Sale $6,172,546
108,500 shares at $56.89 avg
Filed Sep 2, 2026 · traded Aug 31
Pre-arranged (10b5-1) · close on filing date $57.30
Fumihide Esaka · Chief Executive Officer
Chief Executive Officer
$15.5M soldSean Chihhsiang Chen · President and COO
President and COO
$7.0M soldTimothy Chen · Director
Director
$5.6M soldScott McLean Hanson · Chief Technology Officer
Chief Technology Officer
$5.5M soldJeffrey G. Winzeler · Chief Financial Officer
Chief Financial Officer
$1.8M soldKer Zhang · Director
Director
$644.9K sold2 others
Combined, one mark per week
$263.0K soldOpen-market trades
22 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Fumihide Esaka | Chief Executive Officer | $15.5M | — | 5 | 73% of sales | |
| Sean Chihhsiang Chen | President and COO | $7.0M | — | 5 | 44% of sales | |
| Timothy Chen | Director | $5.6M | — | 1 | — | |
| Scott McLean Hanson | Chief Technology Officer | $5.5M | — | 6 | 22% of sales | |
| Jeffrey G. Winzeler | Chief Financial Officer | $1.8M | — | 1 | — | |
| Ker Zhang | Director | $644.9K | — | 2 | — | |
| Joseph A. Tautges | Director | $241.8K | — | 1 | — | |
| Michele Kim Connors | General Counsel | $21.2K | — | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Scott McLean Hanson Chief Technology Officer | SalePre-arranged (10b5-1) | 7,000 | $51.00 | $357.0K | 214,346 | |
traded | Fumihide Esaka Chief Executive Officer | SalePre-arranged (10b5-1) | 5,000 | $51.00 | $255.0K | 443,900 | |
traded | Sean Chihhsiang Chen President and COO | SalePre-arranged (10b5-1) | 15,000 | $51.50 | $772.4K | 106,468 | |
traded | Sean Chihhsiang Chen President and COO | SalePre-arranged (10b5-1) | 8,205 | $66.78 | $548.0K | 106,368 | |
traded | Scott McLean Hanson Chief Technology Officer | SalePre-arranged (10b5-1) | 7,000 | $60.28 | $421.9K | 221,326 | |
traded | Ker Zhang Director | Sale | 10,000 | $63.44 | $634.4K | 21,266 | |
traded | Fumihide Esaka Chief Executive Officer | SalePre-arranged (10b5-1) | 63,500 | $62.70 | $4.0M | 460,460 | |
traded | Sean Chihhsiang Chen President and COO | SalePre-arranged (10b5-1) | 15,000 | $60.14 | $902.1K | 120,275 | |
traded | Ker Zhang Director | Sale | 185 | $56.92 | $10.5K | 30,366 | |
traded | Sean Chihhsiang Chen President and COO | SalePre-arranged (10b5-1) | 15,000 | $57.17 | $857.6K | 120,275 | |
traded | Fumihide Esaka Chief Executive Officer | SalePre-arranged (10b5-1) | 108,500 | $56.89 | $6.2M | 470,035 | |
traded | Scott McLean Hanson Chief Technology Officer | Sale | 55,000 | $59.69 | $3.3M | 226,136 | |
traded | Scott McLean Hanson Chief Technology Officer | SalePre-arranged (10b5-1) | 7,000 | $64.38 | $450.6K | 217,426 | |
traded | Fumihide Esaka Chief Executive Officer | SalePre-arranged (10b5-1) | 13,500 | $64.39 | $869.2K | 451,189 | |
traded | Timothy Chen Director | Sale | 70,592 | $79.79 | $5.6M | 0 | |
traded | Jeffrey G. Winzeler Chief Financial Officer | Sale | 26,000 | $69.90 | $1.8M | 94,395 | |
traded | Scott McLean Hanson Chief Technology Officer | Sale | 10,200 | $69.24 | $706.3K | 209,426 | |
traded | Fumihide Esaka Chief Executive Officer | Sale | 60,000 | $70.02 | $4.2M | 391,189 | |
traded | Sean Chihhsiang Chen President and COO | Sale | 55,685 | $70.89 | $3.9M | 120,275 | |
traded | Michele Kim Connors General Counsel | Sale | 811 | $26.15 | $21.2K | 60,705 | |
traded | Joseph A. Tautges Director | Sale | 7,800 | $31.00 | $241.8K | 48,746 | |
traded | Scott McLean Hanson Chief Technology Officer | Sale | 10,000 | $31.00 | $310.0K | 122,818 |
GET /stocks/filings/vX/form-4?tickers=AMBQ&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"AMBQ"
],
"issuer_cik": "0001500412",
"owner_cik": "0002078339",
"accession_number": "0002078339-26-000020",
"form_type": "4",
"filing_date": "2026-10-16",
"period_of_report": "2026-10-15",
"issuer_name": "Ambiq Micro, Inc.",
"issuer_trading_symbol": "AMBQ",
"owner_name": "Hanson Scott McLean",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Technology Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-15",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 1800,
"transaction_price_per_share": 51.8615,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 212546,
"transaction_value": 93350.7,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on May 15, 2026."
},
{
"id": "F5",
"description": "The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $51.74 to $52.00 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."
}
]
},
{
"tickers": [
"AMBQ"
],
"issuer_cik": "0001500412",
"owner_cik": "0002078339",
"accession_number": "0002078339-26-000020",
"form_type": "4",
"filing_date": "2026-10-16",
"period_of_report": "2026-10-15",
"issuer_name": "Ambiq Micro, Inc.",
"issuer_trading_symbol": "AMBQ",
"owner_name": "Hanson Scott McLean",
"is_director": true,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Technology Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-15",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 600,
"transaction_price_per_share": 49.0592,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 218946,
"transaction_value": 29435.519999999997,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The transactions reported in this Form 4 occurred under a Rule 10b5-1 plan adopted by the Reporting Person on May 15, 2026."
},
{
"id": "F2",
"description": "The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $48.61 to $49.59 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."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 54 records
- Option exercises29 records
- Tax withholding (sold to cover)12 records
- Grants and awards12 records
- Other1 record
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
Has Ambiq Micro, Inc.'s CEO sold stock?
Yes. Fumihide Esaka (CEO) sold 250,500 shares ($15.5M) between May 2026 and Oct 2026, $11.3M of it under a pre-arranged 10b5-1 plan.
How current is AMBQ’s insider data?
These are AMBQ Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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