AMBQ · Ambiq Micro, Inc. · Shareholders & Ownership

$52.40 +1.42 (+2.79%)

Russell 2000 member Rebalance outlook locked

Market Cap

$1.28B

24.18M

Volume · Oct 21 318.5K Avg daily vol (3M) 506.8K

Every disclosed holder of AMBQ in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns AMBQ

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	187	17,286,381	71.48%	Yes
Insiders (Forms 3, 4, 5)	11	3,183,539	13.16%	Yes
13D/G-only blocks	1	1,488,949	6.16%	Yes
Remaining	—	2,225,667	9.20%	Rest
Registered funds (N-PORT, not summed)	163	5,672,332	23.45%	No

Shares outstanding: 24,184,536, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of AMBQ

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	KPCB XVI Associates, LLC Insider CIK 1611734 · Jul 31, 2025 10% Owner, issuer-wide	1,488,949	6.16%	+1,064,916	Jul 31, 2025	10% Owner, issuer-wide
2	KPCB XVI Associates, LLC 13G CIK 1611731 · Unknown · Sep 30, 2025 Rule 13d-1(d), exempt investor	1,488,949	6.16%	—	Sep 30, 2025	Rule 13d-1(d), exempt investor
3	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,380,623	5.71%	+367,462	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	BlackRock, Inc. 13G CIK 2012383 · Holding company · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	1,264,792	5.23%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
3.2	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	485,077	2.01%	+55,685	Jun 30, 2026	iShares Trust, not summed
3.3	iShares Russell 2000 Growth ETF Fund S000004343 · Registered fund · Jun 30, 2026 iShares Trust, not summed	171,615	0.71%	+77,099	Jun 30, 2026	iShares Trust, not summed
3.4	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	62,276	0.26%	+16,522	Jun 30, 2026	iShares Trust, not summed
3.5	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	34,756	0.14%	+5,334	Jun 30, 2026	Quantitative Master Series LLC, not summed
4	T. Rowe Price Investment Management, Inc. 13F CIK 1897612 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,006,359	4.16%	-261,192	Jun 30, 2026	carried, not yet filed for the newest quarter
4.1	T. Rowe Price Investment Management, Inc. 13G CIK 1897612 · Investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	1,006,359	4.16%	-261,192	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
5	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	983,916	4.07%	+983,916	Jun 30, 2026	carried, not yet filed for the newest quarter
6	Atreides Management, LP 13F CIK 1777813 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	877,123	3.63%	+14,948	Jun 30, 2026	carried, not yet filed for the newest quarter
7	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	861,979	3.56%	+601,752	Jun 30, 2026	carried, not yet filed for the newest quarter
7.1	State Street(R) SPDR(R) S&P(R) Semiconductor ETF Fund S000010020 · Registered fund · Jun 30, 2026 SPDR SERIES TRUST, not summed	351,300	1.45%	—	Jun 30, 2026	SPDR SERIES TRUST, not summed
7.2	State Street(R) SPDR(R) S&P Kensho New Economies Composite ETF Fund S000063362 · Registered fund · Jun 30, 2026 SPDR SERIES TRUST, not summed	151,690	0.63%	—	Jun 30, 2026	SPDR SERIES TRUST, not summed
7.3	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	6,400	0.03%	+200	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
7.4	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	469	0.00%	+39	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
7.5	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	48	0.00%	—	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
8	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	768,539	3.18%	+61,135	Jun 30, 2026	carried, not yet filed for the newest quarter
9	TWO SIGMA INVESTMENTS, LP 13F CIK 1179392 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	651,786	2.70%	+614,992	Jun 30, 2026	carried, not yet filed for the newest quarter
10	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	643,350	2.66%	+33,587	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
11	HSIEH Wen Hsuan Insider CIK 1835160 · Jun 8, 2026 Director, issuer-wide	638,877	2.64%	+4,957	Jun 8, 2026	Director, issuer-wide
12	ALLIANCEBERNSTEIN L.P. 13F CIK 1109448 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	609,607	2.52%	-76,491	Jun 30, 2026	carried, not yet filed for the newest quarter
12.1	AB Small Cap Growth Portfolio Fund S000010309 · Registered fund · Jun 30, 2026 AB CAP FUND, INC., not summed	273,048	1.13%	-51,804	Jun 30, 2026	AB CAP FUND, INC., not summed
12.2	Small Cap Core Portfolio Fund S000051867 · Registered fund · Jun 30, 2026 Bernstein Fund Inc, not summed	25,473	0.11%	—	Jun 30, 2026	Bernstein Fund Inc, not summed
12.3	AB Small Cap Growth Portfolio Fund S000010435 · Registered fund · Jun 30, 2026 AB VARIABLE PRODUCTS SERIES FUND, INC., not summed	5,241	0.02%	-1,084	Jun 30, 2026	AB VARIABLE PRODUCTS SERIES FUND, INC., not summed
13	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	446,950	1.85%	+33,524	Jun 30, 2026	carried, not yet filed for the newest quarter
13.1	Goldman Sachs Small Cap Growth Fund Fund S000061413 · Registered fund · May 31, 2026 Goldman Sachs Trust, not summed	69,778	0.29%	-22,313	May 31, 2026	Goldman Sachs Trust, not summed
13.2	Goldman Sachs Small Cap Equity Insights Fund Fund S000009329 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	17,130	0.07%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
13.3	Goldman Sachs Small Cap Growth Insights Fund Fund S000014930 · Registered fund · Jul 31, 2026 Goldman Sachs Trust, not summed	10,383	0.04%	—	Jul 31, 2026	Goldman Sachs Trust, not summed
13.4	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Jun 30, 2026 GOLDMAN SACHS TRUST, not summed	2,900	0.01%	+148	Jun 30, 2026	GOLDMAN SACHS TRUST, not summed
14	Esaka Fumihide Insider CIK 2078454 · Oct 15, 2026 Director, Chief Executive Officer, issuer-wide	443,900	1.84%	0	Oct 15, 2026	Director, Chief Executive Officer, issuer-wide
15	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	339,327	1.40%	+41,779	Jun 30, 2026	carried, not yet filed for the newest quarter
16	NEEDHAM INVESTMENT MANAGEMENT LLC 13F CIK 1167212 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	323,700	1.34%	+123,700	Jun 30, 2026	carried, not yet filed for the newest quarter
16.1	Needham Aggressive Growth Fund Fund S000003815 · Registered fund · Jun 30, 2026 Needham Funds Inc, not summed	278,990	1.15%	+103,990	Jun 30, 2026	Needham Funds Inc, not summed
16.2	Needham Small Cap Growth Fund Fund S000003816 · Registered fund · Jun 30, 2026 Needham Funds Inc, not summed	44,710	0.18%	+19,710	Jun 30, 2026	Needham Funds Inc, not summed
17	Schonfeld Strategic Advisors LLC 13F CIK 1665241 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	315,455	1.30%	-341,097	Jun 30, 2026	carried, not yet filed for the newest quarter
18	SILVERCREST ASSET MANAGEMENT GROUP LLC 13F CIK 1232395 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	309,096	1.28%	+26,723	Jun 30, 2026	carried, not yet filed for the newest quarter
19	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	294,802	1.22%	+294,802	Jun 30, 2026	carried, not yet filed for the newest quarter
20	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	289,206	1.20%	+111,650	Jun 30, 2026	carried, not yet filed for the newest quarter
21	Driehaus Capital Management LLC 13F CIK 938206 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	288,979	1.19%	-91,789	Jun 30, 2026	carried, not yet filed for the newest quarter
21.1	Driehaus Micro Cap Growth Fund Fund S000042829 · Registered fund · Jun 30, 2026 Driehaus Mutual Funds, not summed	45,501	0.19%	-15,322	Jun 30, 2026	Driehaus Mutual Funds, not summed
22	NEUBERGER BERMAN GROUP LLC 13F CIK 1465109 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	272,126	1.13%	+272,126	Jun 30, 2026	carried, not yet filed for the newest quarter
23	First Eagle Investment Management, LLC 13F CIK 1325447 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	244,394	1.01%	-34,679	Jun 30, 2026	carried, not yet filed for the newest quarter
23.1	First Eagle Small Cap Opportunity Fund Fund S000072438 · Registered fund · Jul 31, 2026 First Eagle Funds, not summed	55,655	0.23%	-191,954	Jul 31, 2026	First Eagle Funds, not summed
24	EMERALD ADVISERS, LLC 13F CIK 1015083 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	243,664	1.01%	+243,664	Jun 30, 2026	carried, not yet filed for the newest quarter
25	HRT FINANCIAL LP 13F CIK 1475597 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	225,639	0.93%	+225,639	Jun 30, 2026	carried, not yet filed for the newest quarter
26	FRANKLIN RESOURCES INC 13F CIK 38777 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	223,763	0.93%	-318,453	Jun 30, 2026	carried, not yet filed for the newest quarter
26.1	Templeton Global Smaller Companies Fund Fund S000008758 · Registered fund · May 31, 2026 Templeton Global Smaller Companies Fund, not summed	286,529	1.18%	-200,575	May 31, 2026	Templeton Global Smaller Companies Fund, not summed
27	VOLORIDGE INVESTMENT MANAGEMENT, LLC 13F CIK 1556921 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	223,276	0.92%	+223,276	Jun 30, 2026	carried, not yet filed for the newest quarter
28	COOPER CREEK PARTNERS MANAGEMENT LLC 13F CIK 1512162 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	220,000	0.91%	+220,000	Jun 30, 2026	carried, not yet filed for the newest quarter
29	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	214,756	0.89%	+172,156	Jun 30, 2026	carried, not yet filed for the newest quarter
30	Walleye Capital LLC 13F CIK 1758720 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	214,528	0.89%	+203,099	Jun 30, 2026	carried, not yet filed for the newest quarter
31	Hanson Scott McLean Insider CIK 2078339 · Oct 15, 2026 Director, Chief Technology Officer, issuer-wide	212,546	0.88%	0	Oct 15, 2026	Director, Chief Technology Officer, issuer-wide
32	BNP PARIBAS ARBITRAGE, SA 13F CIK 1166588 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	204,181	0.84%	+200,292	Jun 30, 2026	carried, not yet filed for the newest quarter
33	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	203,273	0.84%	+155,240	Jun 30, 2026	carried, not yet filed for the newest quarter
34	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	200,790	0.83%	+124,271	Jun 30, 2026	carried, not yet filed for the newest quarter
35	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	182,007	0.75%	+150,602	Jun 30, 2026	carried, not yet filed for the newest quarter
36	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	169,890	0.70%	+10,989	Jun 30, 2026	carried, not yet filed for the newest quarter
37	WELLINGTON MANAGEMENT GROUP LLP 13F CIK 902219 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	168,139	0.70%	+168,139	Jun 30, 2026	carried, not yet filed for the newest quarter
38	DEUTSCHE BANK AG\ 13F CIK 948046 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	165,367	0.68%	+142,357	Jun 30, 2026	carried, not yet filed for the newest quarter
38.1	DWS Digital Horizons Fund Fund S000032042 · Registered fund · Jun 30, 2026 DEUTSCHE DWS SECURITIES TRUST, not summed	8,881	0.04%	-4,146	Jun 30, 2026	DEUTSCHE DWS SECURITIES TRUST, not summed
38.2	DWS Small Cap Index VIP Fund S000006223 · Registered fund · Jun 30, 2026 DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed	2,923	0.01%	+397	Jun 30, 2026	DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed
39	GILDER GAGNON HOWE & CO LLC 13F CIK 902464 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	159,623	0.66%	+50,046	Jun 30, 2026	carried, not yet filed for the newest quarter
40	EMERALD MUTUAL FUND ADVISERS TRUST 13F CIK 1352895 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	159,131	0.66%	+159,131	Jun 30, 2026	carried, not yet filed for the newest quarter
41	PRICE T ROWE ASSOCIATES INC /MD/ 13F CIK 80255 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	156,906	0.65%	+141,970	Jun 30, 2026	carried, not yet filed for the newest quarter
41.1	T. Rowe Price Small-Cap Stock Fund, Inc. Fund S000002120 · Registered fund · Jun 30, 2026 T. ROWE PRICE SMALL-CAP STOCK FUND, INC., not summed	301,794	1.25%	-11,635	Jun 30, 2026	T. ROWE PRICE SMALL-CAP STOCK FUND, INC., not summed
41.2	T. Rowe Price Small-Cap Value Fund, Inc. Fund S000002121 · Registered fund · Jun 30, 2026 T. ROWE PRICE SMALL-CAP VALUE FUND, INC., not summed	177,801	0.74%	-151,089	Jun 30, 2026	T. ROWE PRICE SMALL-CAP VALUE FUND, INC., not summed
41.3	T. Rowe Price Institutional Small-Cap Stock Fund Fund S000002094 · Registered fund · Jun 30, 2026 T. Rowe Price Equity Funds, Inc., not summed	162,616	0.67%	-6,875	Jun 30, 2026	T. Rowe Price Equity Funds, Inc., not summed
41.4	T. Rowe Price New Horizons Fund, Inc. Fund S000002106 · Registered fund · Jun 30, 2026 T. ROWE PRICE NEW HORIZONS FUND, INC., not summed	93,167	0.39%	—	Jun 30, 2026	T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
41.5	T. Rowe Price Spectrum Moderate Growth Allocation Fund Fund S000002138 · Registered fund · May 31, 2026 T. ROWE PRICE SPECTRUM FUNDS II, INC., not summed	10,370	0.04%	-1,532	May 31, 2026	T. ROWE PRICE SPECTRUM FUNDS II, INC., not summed
42	SOFTBANK GROUP CORP. 13F CIK 1065521 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	148,939	0.62%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
43	SmallCap Growth Fund I Fund S000007175 · Registered fund · Jul 31, 2026 Principal Funds, Inc, not summed	146,860	0.61%	+54,055	Jul 31, 2026	Principal Funds, Inc, not summed
44	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	138,965	0.57%	+103,244	Jun 30, 2026	carried, not yet filed for the newest quarter
44.1	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	100,325	0.41%	+86,140	Jun 30, 2026	College Retirement Equities Fund, not summed
44.2	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	24,564	0.10%	+3,028	Jul 31, 2026	TIAA-CREF Funds, not summed
44.3	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	13,472	0.06%	—	Jul 31, 2026	TIAA-CREF Funds, not summed
44.4	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	354	0.00%	—	Jun 30, 2026	TIAA Separate Account VA-1, not summed
44.5	Nuveen Life Stock Index Fund Fund S000005094 · Registered fund · Jun 30, 2026 TIAA-CREF Life Funds, not summed	250	0.00%	—	Jun 30, 2026	TIAA-CREF Life Funds, not summed
45	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	130,802	0.54%	+19,955	Jun 30, 2026	carried, not yet filed for the newest quarter
45.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	9,397	0.04%	+529	Jun 30, 2026	Northern Funds, not summed
45.2	FlexShares Morningstar US Market Factor Tilt Index Fund Fund S000033312 · Registered fund · Jul 31, 2026 FlexShares Trust, not summed	632	0.00%	—	Jul 31, 2026	FlexShares Trust, not summed
46	WASATCH ADVISORS LP 13F CIK 814133 · Registered investment adviser · Sep 30, 2026	127,635	0.53%	+46,076	Sep 30, 2026
46.1	Wasatch Micro Cap Fund Fund S000000885 · Registered fund · Jun 30, 2026 WASATCH FUNDS TRUST, not summed	80,854	0.33%	-170,977	Jun 30, 2026	WASATCH FUNDS TRUST, not summed
47	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 13F CIK 1535845 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	126,029	0.52%	+126,029	Jun 30, 2026	carried, not yet filed for the newest quarter
48	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	122,425	0.51%	+122,425	Jun 30, 2026	carried, not yet filed for the newest quarter
49	Hood River Capital Management LLC 13F CIK 1578177 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	121,738	0.50%	+121,738	Jun 30, 2026	carried, not yet filed for the newest quarter
49.1	Hood River New Opportunities Fund Fund S000086255 · Registered fund · Jun 30, 2026 Manager Directed Portfolios, not summed	39,362	0.16%	—	Jun 30, 2026	Manager Directed Portfolios, not summed
50	S SQUARED TECHNOLOGY, LLC 13F CIK 1322924 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	120,773	0.50%	-72,000	Jun 30, 2026	carried, not yet filed for the newest quarter

15 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 280 holders

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Key facts CIK 1500412 CUSIP 023193105 13F (30d) 13 filings 13 filers Visit website Investor relations