AMBQ: AMBIQ MICRO INC insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
0 open-market buys totaling - and 29 sales totaling $4.47M in the last 180 days.
Insider sales
| Trade date | Insider | Role | Value | 10b5-1 plan |
|---|---|---|---|---|
| 2026-10-15 | Esaka Fumihide | CEO | $25K | yes |
| 2026-10-15 | Esaka Fumihide | CEO | $25K | yes |
| 2026-10-15 | Esaka Fumihide | CEO | $143K | yes |
| 2026-10-15 | Esaka Fumihide | CEO | $62K | yes |
| 2026-10-15 | Hanson Scott Mclean | Officer | $29K | yes |
| 2026-10-15 | Hanson Scott Mclean | Officer | $45K | yes |
| 2026-10-15 | Hanson Scott Mclean | Officer | $189K | yes |
| 2026-10-15 | Hanson Scott Mclean | Officer | $93K | yes |
| 2026-10-14 | Chen Sean Chihhsiang | President | $378K | yes |
| 2026-10-14 | Chen Sean Chihhsiang | President | $65K | yes |
| 2026-10-14 | Chen Sean Chihhsiang | President | $105K | yes |
| 2026-10-14 | Chen Sean Chihhsiang | President | $214K | yes |
| 2026-10-14 | Chen Sean Chihhsiang | President | $11K | yes |
| 2026-10-05 | Chen Sean Chihhsiang | President | $366K | yes |
| 2026-10-05 | Chen Sean Chihhsiang | President | $121K | yes |
| 2026-10-05 | Chen Sean Chihhsiang | President | $54K | yes |
| 2026-10-05 | Chen Sean Chihhsiang | President | $7K | yes |
| 2026-10-02 | Chen Sean Chihhsiang | President | $172K | yes |
| 2026-10-02 | Chen Sean Chihhsiang | President | $210K | yes |
| 2026-10-02 | Chen Sean Chihhsiang | President | $22K | yes |
| 2026-10-02 | Esaka Fumihide | CEO | $492K | |
| 2026-10-02 | Esaka Fumihide | CEO | $599K | |
| 2026-10-02 | Esaka Fumihide | CEO | $62K | |
| 2026-10-02 | Hanson Scott Mclean | Officer | $258K | |
| 2026-10-02 | Hanson Scott Mclean | Officer | $314K | |
| 2026-10-02 | Hanson Scott Mclean | Officer | $32K | |
| 2026-10-02 | Winzeler Jeffrey G | CFO | $162K | |
| 2026-10-02 | Winzeler Jeffrey G | CFO | $197K | |
| 2026-10-02 | Winzeler Jeffrey G | CFO | $20K |
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-14 | Fell below 5% | T. Rowe Price Investment Management, Inc. | 4.30% | SEC | |
| 2026-07-27 | New 13G stake | BlackRock, Inc. | 5.30% | SEC |
Institutional ownership (Q2 2026)
184 institutions reported holding $1.34B of AMBIQ MICRO INC on Form 13F (97 the quarter before). 98 opened a new position and 10 sold out. Shares held by institutions: +59%.
| Largest holders | Shares | Value |
|---|---|---|
| BlackRock, Inc. | 1,380,623 | $121.91M |
| D. E. Shaw & Co., Inc. | 983,916 | $86.88M |
| Atreides Management, LP | 877,123 | $77.45M |
| STATE STREET CORP | 861,979 | $76.11M |
| VANGUARD CAPITAL MANAGEMENT LLC | 768,539 | $67.86M |
| TWO SIGMA INVESTMENTS, LP | 651,786 | $57.55M |
| First Eagle Investment Management, LLC | 488,788 | $43.16M |
| GOLDMAN SACHS GROUP INC | 446,950 | $39.47M |
| GEODE CAPITAL MANAGEMENT, LLC | 339,327 | $29.97M |
| NEEDHAM INVESTMENT MANAGEMENT LLC | 323,700 | $28.58M |
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