AMBQ insider buying and SEC filings, explained
Ambiq Micro, Inc. · CIK 1500412
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$9.0M
Planned sales (10b5-1)
$16.0M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 15, 2026 | Planned (10b5-1) | Scott McLean Hanson (Chief Technology Officer and Director) sold 7,000 shares at about $51.00 ($357K), marked as a 10b5-1 plan trade. Holdings down 3% to 212,546 shares. | SEC filing Filed Oct 16, 2026, 4:53 PM ET |
| Oct 15, 2026 | Planned (10b5-1) | Fumihide Esaka (CEO and Director) sold 5,000 shares at about $51.00 ($255K), marked as a 10b5-1 plan trade. Holdings down 1% to 443,900 shares. | SEC filing Filed Oct 16, 2026, 4:52 PM ET |
| Oct 14, 2026 | Planned (10b5-1) | Sean Chihhsiang Chen (President / COO) sold 15,000 shares at about $51.50 ($772K), marked as a 10b5-1 plan trade. Holdings down 12% to 106,268 shares. | SEC filing Filed Oct 16, 2026, 4:51 PM ET |
| Oct 2, 2026 | Sale | Jeffrey G Winzeler (CFO) sold 5,455 shares at about $69.60 ($380K). Holdings down 5% to 100,844 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Oct 6, 2026, 8:16 PM ET |
| Oct 2, 2026 | Sale | Fumihide Esaka (CEO and Director) sold 16,560 shares at about $69.60 ($1.2M). Holdings down 4% to 443,900 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Oct 6, 2026, 6:53 PM ET |
| Oct 2, 2026 | Sale | Scott McLean Hanson (Chief Technology Officer and Director) sold 8,680 shares at about $69.60 ($604K). Holdings down 4% to 212,546 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Oct 6, 2026, 6:49 PM ET |
| Oct 2–5, 2026 | Planned (10b5-1) | Sean Chihhsiang Chen (President / COO) sold 14,007 shares between Oct 2 and Oct 5 at about $67.95 ($952K), marked as a 10b5-1 plan trade. Holdings down 12% to 106,268 shares. | SEC filing Filed Oct 6, 2026, 6:45 PM ET |
| Sep 15, 2026 | Planned (10b5-1) | Scott McLean Hanson (Chief Technology Officer and Director) sold 7,000 shares at about $60.28 ($422K), marked as a 10b5-1 plan trade. Holdings down 3% to 221,226 shares. | SEC filing Filed Sep 17, 2026 |
| Sep 14, 2026 | Planned (10b5-1) | Sean Chihhsiang Chen (President / COO) sold 15,000 shares at about $60.14 ($902K), marked as a 10b5-1 plan trade. Holdings down 11% to 120,275 shares. | SEC filing Filed Sep 15, 2026 |
| Sep 11–15, 2026 | Planned (10b5-1) | Fumihide Esaka (CEO and Director) sold 63,500 shares between Sep 11 and Sep 15 at about $62.71 ($4.0M), marked as a 10b5-1 plan trade. Holdings down 12% to 460,460 shares. | SEC filing Filed Sep 15, 2026 |
| Sep 11, 2026 | Sale | Ker Zhang (Director) sold 10,000 shares at about $63.44 ($634K). Holdings down 33% to 20,366 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 15, 2026 |
| Sep 4, 2026 | Planned (10b5-1) | Sean Chihhsiang Chen (President / COO) sold 15,000 shares at about $57.17 ($858K), marked as a 10b5-1 plan trade. Holdings down 11% to 120,275 shares. | SEC filing Filed Sep 9, 2026 |
| Aug 31–Sep 2, 2026 | Planned (10b5-1) | Fumihide Esaka (CEO and Director) sold 108,500 shares between Aug 31 and Sep 2 at about $56.89 ($6.2M), marked as a 10b5-1 plan trade. Holdings down 19% to 460,460 shares. | SEC filing Filed Sep 2, 2026 |
| Aug 14, 2026 | Planned (10b5-1) | Fumihide Esaka (CEO and Director) sold 13,500 shares at about $64.39 ($869K), marked as a 10b5-1 plan trade. Holdings down 3% to 451,189 shares. | SEC filing Filed Aug 18, 2026 |
| Aug 14, 2026 | Planned (10b5-1) | Scott McLean Hanson (Chief Technology Officer and Director) sold 7,000 shares at about $64.38 ($451K), marked as a 10b5-1 plan trade. Holdings down 3% to 211,226 shares. | SEC filing Filed Aug 18, 2026 |
| May 27, 2026 | Sale | Timothy Chen (Director) sold 70,592 shares indirectly (by entity) at about $79.79 ($5.6M). Holdings by entity down 100% to 0 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 29, 2026 |
| Apr 2, 2026 | Sale | Michele Kim Connors (General Counsel) sold 811 shares at about $26.15 ($21K). Holdings down 1% to 60,554 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Apr 6, 2026 |
| Jan 26, 2026 | Sale | Scott McLean Hanson (Chief Technology Officer and Director) sold 10,000 shares at $31.00 ($310K). Holdings down 8% to 122,818 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jan 28, 2026 |
| Jan 26, 2026 | Sale | Joseph A. Tautges (Director) sold 7,800 shares at $31.00 ($242K). Holdings down 14% to 48,746 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jan 28, 2026 |
37 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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