Ambiq Micro, Inc. (AMBQ) · Insider trading

What Ambiq Micro's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.

Bought, 12 months

0 insiders, 0 trades

Sold, 12 months

$38.93M

8 insiders, 41% under a plan

Net, 12 months

−$38.93M

bought less sold

Latest filing

2026-10-16

filings read to 2026-10-19

Bought and sold at the market, by month

Two years. Purchases above the line, sales below, in dollars.

Bought Sold Largest month: $16.30M

Who traded, two years

Insider	Bought	Sold	Trades	Last trade	Holds after
Esaka FumihideDirector, Chief Executive Officer	–	$16.63M	25	2026-10-15	448,400
Chen Sean ChihhsiangPresident and COO	–	$7.43M	19	2026-10-14	113,729
Hanson Scott McLeanDirector, Chief Technology Officer	–	$6.13M	20	2026-10-15	218,946
Chen TimothyDirector	–	$5.63M	4	2026-05-27	–
Winzeler Jeffrey GChief Financial Officer	–	$2.20M	5	2026-10-02	103,956
Zhang KerDirector	–	$644,934	3	2026-09-11	21,266
Tautges Joseph ADirector	–	$241,800	1	2026-01-26	48,746
Connors Michele KimGeneral Counsel	–	$21,211	2	2026-04-02	60,705

Open-market purchases and sales

Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.

Date	Insider	Trade	Shares	Price	Value	Holds after	Filing
2026-10-15	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	600	49.06	$29,436	218,946	Form 4
2026-10-15	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	900	50.08	$45,074	218,046	Form 4
2026-10-15	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	3,700	51.12	$189,148	214,346	Form 4
2026-10-15	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	1,800	51.86	$93,351	212,546	Form 4
2026-10-15	Esaka FumihideDirector, Chief Executive Officer	Saleplan	500	49.13	$24,567	448,400	Form 4
2026-10-15	Esaka FumihideDirector, Chief Executive Officer	Saleplan	500	50.02	$25,011	447,900	Form 4
2026-10-15	Esaka FumihideDirector, Chief Executive Officer	Saleplan	2,800	51.15	$143,214	445,100	Form 4
2026-10-15	Esaka FumihideDirector, Chief Executive Officer	Saleplan	1,200	51.85	$62,226	443,900	Form 4
2026-10-14	Chen Sean ChihhsiangPresident and COO	Saleplan	7,539	50.13	$377,923	113,729	Form 4
2026-10-14	Chen Sean ChihhsiangPresident and COO	Saleplan	1,261	51.53	$64,980	112,468	Form 4
2026-10-14	Chen Sean ChihhsiangPresident and COO	Saleplan	2,000	52.47	$104,936	110,468	Form 4
2026-10-14	Chen Sean ChihhsiangPresident and COO	Saleplan	4,000	53.44	$213,745	106,468	Form 4
2026-10-14	Chen Sean ChihhsiangPresident and COO	Saleplan	200	54.27	$10,854	106,268	Form 4
2026-10-05	Chen Sean ChihhsiangPresident and COO	Saleplan	5,508	66.38	$365,625	108,965	Form 4
2026-10-05	Chen Sean ChihhsiangPresident and COO	Saleplan	1,797	67.29	$120,913	107,168	Form 4
2026-10-05	Chen Sean ChihhsiangPresident and COO	Saleplan	800	68.08	$54,461	106,368	Form 4
2026-10-05	Chen Sean ChihhsiangPresident and COO	Saleplan	100	69.51	$6,951	106,268	Form 4
2026-10-02	Winzeler Jeffrey GChief Financial Officer	Sale	2,343	69.11	$161,921	103,956	Form 4
2026-10-02	Winzeler Jeffrey GChief Financial Officer	Sale	2,828	69.77	$197,316	101,128	Form 4
2026-10-02	Winzeler Jeffrey GChief Financial Officer	Sale	284	71.86	$20,408	100,844	Form 4
2026-10-02	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	3,728	69.11	$257,636	217,498	Form 4
2026-10-02	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	4,500	69.77	$313,975	212,998	Form 4
2026-10-02	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	452	71.86	$32,480	212,546	Form 4
2026-10-02	Esaka FumihideDirector, Chief Executive Officer	Sale	7,113	69.11	$491,567	453,347	Form 4
2026-10-02	Esaka FumihideDirector, Chief Executive Officer	Sale	8,585	69.77	$598,994	444,762	Form 4
2026-10-02	Esaka FumihideDirector, Chief Executive Officer	Sale	862	71.86	$61,943	443,900	Form 4
2026-10-02	Chen Sean ChihhsiangPresident and COO	Saleplan	2,492	69.11	$172,218	117,783	Form 4
2026-10-02	Chen Sean ChihhsiangPresident and COO	Saleplan	3,008	69.77	$209,875	114,775	Form 4
2026-10-02	Chen Sean ChihhsiangPresident and COO	Saleplan	302	71.86	$21,701	114,473	Form 4
2026-09-15	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	1,953	59.53	$116,262	226,273	Form 4
2026-09-15	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	4,947	60.56	$299,590	221,326	Form 4
2026-09-15	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	100	61.00	$6,100	221,226	Form 4
2026-09-15	Esaka FumihideDirector, Chief Executive Officer	Saleplan	3,785	59.56	$225,435	470,175	Form 4
2026-09-15	Esaka FumihideDirector, Chief Executive Officer	Saleplan	9,615	60.55	$582,188	460,560	Form 4
2026-09-15	Esaka FumihideDirector, Chief Executive Officer	Saleplan	100	61.00	$6,100	460,460	Form 4
2026-09-14	Chen Sean ChihhsiangPresident and COO	Saleplan	2,600	59.36	$154,336	132,675	Form 4
2026-09-14	Chen Sean ChihhsiangPresident and COO	Saleplan	11,000	60.24	$662,640	121,675	Form 4
2026-09-14	Chen Sean ChihhsiangPresident and COO	Saleplan	1,400	60.83	$85,162	120,275	Form 4
2026-09-11	Zhang KerDirector	Sale	9,100	63.39	$576,849	21,266	Form 4
2026-09-11	Zhang KerDirector	Sale	900	63.95	$57,555	20,366	Form 4

39 more

2026-09-11	Esaka FumihideDirector, Chief Executive Officer	Saleplan	42,083	63.27	$2.66M	468,377	Form 4
2026-09-11	Esaka FumihideDirector, Chief Executive Officer	Saleplan	7,917	63.86	$505,580	460,460	Form 4
2026-09-04	Zhang KerDirector	Sale	185	56.92	$10,530	30,366	Form 4
2026-09-04	Chen Sean ChihhsiangPresident and COO	Saleplan	12,874	57.09	$734,977	122,401	Form 4
2026-09-04	Chen Sean ChihhsiangPresident and COO	Saleplan	2,126	57.68	$122,628	120,275	Form 4
2026-09-02	Esaka FumihideDirector, Chief Executive Officer	Saleplan	1,452	56.15	$81,530	470,035	Form 4
2026-09-02	Esaka FumihideDirector, Chief Executive Officer	Saleplan	9,575	56.77	$543,573	460,460	Form 4
2026-09-01	Esaka FumihideDirector, Chief Executive Officer	Saleplan	48,973	56.39	$2.76M	460,460	Form 4
2026-08-31	Esaka FumihideDirector, Chief Executive Officer	Saleplan	5,899	56.87	$335,476	458,790	Form 4
2026-08-31	Esaka FumihideDirector, Chief Executive Officer	Saleplan	5,501	57.75	$317,683	453,289	Form 4
2026-08-31	Esaka FumihideDirector, Chief Executive Officer	Saleplan	2,100	58.52	$122,892	451,189	Form 4
2026-08-31	Esaka FumihideDirector, Chief Executive Officer	Saleplan	15,600	56.81	$886,236	479,860	Form 4
2026-08-31	Esaka FumihideDirector, Chief Executive Officer	Saleplan	13,800	57.70	$796,260	466,060	Form 4
2026-08-31	Esaka FumihideDirector, Chief Executive Officer	Saleplan	5,600	58.46	$327,376	460,460	Form 4
2026-08-27	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	22,590	59.69	$1.35M	226,136	Form 4
2026-08-27	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	4,910	60.32	$296,171	221,226	Form 4
2026-08-26	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	27,500	59.58	$1.64M	221,226	Form 4
2026-08-14	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	800	63.26	$50,608	217,426	Form 4
2026-08-14	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	5,400	64.41	$347,814	212,026	Form 4
2026-08-14	Hanson Scott McLeanDirector, Chief Technology Officer	Saleplan	800	65.30	$52,240	211,226	Form 4
2026-08-14	Esaka FumihideDirector, Chief Executive Officer	Saleplan	1,282	63.29	$81,138	463,407	Form 4
2026-08-14	Esaka FumihideDirector, Chief Executive Officer	Saleplan	10,718	64.40	$690,239	452,689	Form 4
2026-08-14	Esaka FumihideDirector, Chief Executive Officer	Saleplan	1,500	65.26	$97,890	451,189	Form 4
2026-05-27	Chen TimothyDirector	Saleindirect	22,414	78.85	$1.77M	48,178	Form 4
2026-05-27	Chen TimothyDirector	Saleindirect	24,248	79.72	$1.93M	23,930	Form 4
2026-05-27	Chen TimothyDirector	Saleindirect	20,666	80.61	$1.67M	3,264	Form 4
2026-05-27	Chen TimothyDirector	Saleindirect	3,264	81.57	$266,244	0	Form 4
2026-05-15	Chen Sean ChihhsiangPresident and COO	Sale	32,351	70.53	$2.28M	143,609	Form 4
2026-05-15	Chen Sean ChihhsiangPresident and COO	Sale	23,334	71.37	$1.67M	120,275	Form 4
2026-05-14	Winzeler Jeffrey GChief Financial Officer	Sale	25,918	69.90	$1.81M	94,477	Form 4
2026-05-14	Winzeler Jeffrey GChief Financial Officer	Sale	82	70.65	$5,793	94,395	Form 4
2026-05-14	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	3,900	68.62	$267,618	209,426	Form 4
2026-05-14	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	6,100	69.59	$424,499	203,326	Form 4
2026-05-14	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	200	70.50	$14,100	203,126	Form 4
2026-05-14	Esaka FumihideDirector, Chief Executive Officer	Sale	60,000	70.02	$4.20M	391,189	Form 4
2026-04-02	Connors Michele KimGeneral Counsel	Sale	660	26.04	$17,186	60,705	Form 4
2026-04-02	Connors Michele KimGeneral Counsel	Sale	151	26.65	$4,024	60,554	Form 4
2026-01-26	Tautges Joseph ADirector	Sale	7,800	31.00	$241,800	48,746	Form 4
2026-01-26	Hanson Scott McLeanDirector, Chief Technology Officer	Sale	10,000	31.00	$310,000	122,818	Form 4

Grants, exercises and other transactions

Pay, tax and paperwork rather than a choice to trade at the market price. Two years.

29 × option exercise19 × grant or award6 × conversion

Show them

Date	Insider	What	Shares	Price	Holds after	Filing
2026-10-15	Hanson Scott McLeanDirector, Chief Technology Officer	Option exercise M	+7,000	8.12	219,546	Form 4
2026-10-15	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+5,000	8.12	448,900	Form 4
2026-10-14	Chen Sean ChihhsiangPresident and COO	Option exercise M	+15,000	8.12	121,268	Form 4
2026-09-15	Hanson Scott McLeanDirector, Chief Technology Officer	Option exercise M	+7,000	8.12	228,226	Form 4
2026-09-15	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+13,500	8.12	473,960	Form 4
2026-09-14	Chen Sean ChihhsiangPresident and COO	Option exercise M	+15,000	8.12	135,275	Form 4
2026-09-11	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+50,000	12.60	510,460	Form 4
2026-09-04	Zhang KerDirector	Option exercise M	+1,785	5.88	30,551	Form 4
2026-09-04	Chen Sean ChihhsiangPresident and COO	Option exercise M	+15,000	8.12	135,275	Form 4
2026-09-02	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+11,027	12.60	471,487	Form 4
2026-09-01	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+48,973	12.60	509,433	Form 4
2026-08-31	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+13,500	8.12	464,689	Form 4
2026-08-31	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+44,271	12.60	495,460	Form 4
2026-08-27	Hanson Scott McLeanDirector, Chief Technology Officer	Option exercise M	+27,500	8.12	248,726	Form 4
2026-08-26	Hanson Scott McLeanDirector, Chief Technology Officer	Option exercise M	+10,000	8.12	221,226	Form 4
2026-08-26	Hanson Scott McLeanDirector, Chief Technology Officer	Option exercise M	+27,500	8.12	248,726	Form 4
2026-08-14	Hanson Scott McLeanDirector, Chief Technology Officer	Option exercise M	+7,000	8.12	218,226	Form 4
2026-08-14	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+13,500	8.12	464,689	Form 4
2026-06-08	Zhang KerDirector	Grant or award A	+4,957	–	28,766	Form 4
2026-06-08	Tautges Joseph ADirector	Grant or award A	+4,957	–	53,703	Form 4
2026-06-08	Chen TimothyDirector	Grant or award A	+4,957	–	52,575	Form 4
2026-06-08	Hsieh Wen HsuanDirector	Grant or award A	+4,957	–	4,957	Form 4
2026-06-08	Banks Bernard BennettDirector	Grant or award A	+4,957	–	4,957	Form 4
2026-06-02	Winzeler Jeffrey GChief Financial Officer	Option exercise M	+5,952	16.80	106,299	Form 4
2026-05-15	Winzeler Jeffrey GChief Financial Officer	Option exercise M	+5,952	16.80	100,347	Form 4
2026-05-15	Hanson Scott McLeanDirector, Chief Technology Officer	Option exercise M	+8,100	8.12	211,226	Form 4
2026-05-15	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+45,463	8.12	436,652	Form 4
2026-05-15	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+14,537	12.60	451,189	Form 4
2026-05-15	Chen Sean ChihhsiangPresident and COO	Option exercise M	+55,685	5.88	175,960	Form 4
2026-05-14	Winzeler Jeffrey GChief Financial Officer	Option exercise M	+26,000	16.80	120,395	Form 4
2026-05-14	Hanson Scott McLeanDirector, Chief Technology Officer	Option exercise M	+10,200	8.12	213,326	Form 4
2026-05-14	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+60,000	8.12	451,189	Form 4
2026-03-06	Winzeler Jeffrey GChief Financial Officer	Grant or award A	+41,728	–	94,395	Form 4/A
2026-03-06	Hanson Scott McLeanDirector, Chief Technology Officer	Grant or award A	+80,308	–	203,126	Form 4/A
2026-03-06	Esaka FumihideDirector, Chief Executive Officer	Grant or award A	+160,616	–	391,189	Form 4/A
2026-03-06	Chen Sean ChihhsiangPresident and COO	Grant or award A	+64,246	–	120,275	Form 4/A
2026-03-06	Connors Michele KimGeneral Counsel	Grant or award A	+32,123	–	61,365	Form 4/A
2026-02-18	Hsieh Wen HsuanDirector	Option exercise M	+238,931	12.60	633,920	Form 4
2026-01-05	Connors Michele KimGeneral Counsel	Grant or award A	+23,759	–	23,759	Form 4
2026-01-05	Connors Michele KimGeneral Counsel	Grant or award A	+5,483	–	29,242	Form 4
2025-10-07	Esaka FumihideDirector, Chief Executive Officer	Option exercise M	+53,660	5.88	230,573	Form 4
2025-10-02	Winzeler Jeffrey GChief Financial Officer	Grant or award A	+52,667	–	52,667	Form 4
2025-10-02	Hanson Scott McLeanDirector, Chief Financial Officer	Grant or award A	+83,819	–	132,818	Form 4
2025-10-02	Esaka FumihideDirector, Chief Executive Officer	Grant or award A	+159,907	–	176,913	Form 4
2025-10-02	Chen Sean ChihhsiangPresident and COO	Grant or award A	+56,029	–	56,029	Form 4
2025-07-31	Chen TimothyDirector	Conversion C	+70,592	–	70,592	Form 4/A
2025-07-31	Hsieh Wen HsuanDirector	Conversion C	+394,989	–	394,989	Form 4
2025-07-31	Kleiner Perkins Caufield & Byers Xvi, LLC10% owner	Conversion C	+748,046	–	1,172,079	Form 4
2025-07-31	Kleiner Perkins Caufield & Byers Xvi, LLC10% owner	Conversion C	+98,958	–	1,271,037	Form 4
2025-07-31	Kleiner Perkins Caufield & Byers Xvi, LLC10% owner	Conversion C	+23,294	–	1,294,331	Form 4
2025-07-31	Kleiner Perkins Caufield & Byers Xvi, LLC10% owner	Conversion C	+194,618	–	1,488,949	Form 4
2025-07-29	Tautges Joseph ADirector	Grant or award A	+56,546	–	56,546	Form 4
2025-07-29	Zhang KerDirector	Grant or award A	+23,809	–	23,809	Form 4
2025-07-29	Chen TimothyDirector	Grant or award A	+47,618	–	47,618	Form 4

How to read it

Buy, sale: Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
Plan: A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
Holds after: The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
Value: Shares times the price the form reports, which is often an average over several fills on the day.

Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.

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