AMPX · Amprius Technologies, Inc. · Shareholders & Ownership
$8.18
+0.27 (+3.41%)
At close · Oct 23
Return incl. dividend (before tax)
Market Cap
$1.21B
Shares
146.08M
Volume · Oct 23
6.16M
Avg daily vol (3M)
5.59M
Every disclosed holder of AMPX 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.
Who Owns AMPX
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 97,012,885 | 66.41% |
| Insiders (Forms 3, 4, 5) | 0 | 0.00% |
| 13D/G-only blocks | 20,932,394 | 14.33% |
| Remaining | 28,135,339 | 19.26% |
| Registered funds (N-PORT, not summed) | 28,452,529 | 19.48% |
Shares outstanding: 146,080,618, the issuer's latest cover-page count restated onto today's split basis.
Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.
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 AMPX
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
11,335,092 | ||
| 1.1 |
BlackRock, Inc.
13G
CIK 2012383 · Holding company · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
10,700,817 | ||
| 1.2 |
iShares Russell 2000 ETF
Fund
S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
3,581,914 | ||
| 1.3 |
iShares Russell 2000 Growth ETF
Fund
S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,257,273 | ||
| 1.4 |
Master Small Cap Index Series
Fund
S000002716 · Registered fund · Jun 30, 2026
Quantitative Master Series LLC, not summed
|
256,982 | ||
| 1.5 |
iShares U.S. Small-Cap Equity Factor ETF
Fund
S000048624 · Registered fund · Jul 31, 2026
iShares Trust, not summed
|
211,670 | ||
| 2 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,562,985 | ||
| 3 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,105,505 | ||
| 4 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,318,630 | ||
| 5 |
|
4,072,269 | ||
| 6 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
3,824,005 | ||
| 7 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,520,655 | ||
| 8 |
JANE STREET GROUP, LLC
13F
CIK 1595888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,401,071 | ||
| 8.1 |
JANE STREET GROUP, LLC
13G
CIK 1595888 · Unknown · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
|
4,713,803 | ||
| 9 |
|
3,240,285 | ||
| 9.1 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
44,900 | ||
| 9.2 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
3,470 | ||
| 9.3 |
State Street(R) SPDR(R) Portfolio MSCI Global Stock Market ETF
Fund
S000036082 · Registered fund · Jun 30, 2026
SPDR INDEX SHARES FUNDS, not summed
|
3,364 | ||
| 9.4 |
State Street Balanced Index Fund
Fund
S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
739 | ||
| 10 |
|
3,112,992 | ||
| 11 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,542,294 | ||
| 11.1 |
Goldman Sachs Small Cap Equity Insights Fund
Fund
S000009329 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
87,201 | ||
| 11.2 |
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund
S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
52,871 | ||
| 11.3 |
Goldman Sachs Small Cap Growth Insights Fund
Fund
S000014930 · Registered fund · Jul 31, 2026
Goldman Sachs Trust, not summed
|
40,189 | ||
| 11.4 |
Goldman Sachs Variable Insurance Trust Small Cap Equity Insights Fund
Fund
S000009355 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
|
8,451 | ||
| 11.5 |
Goldman Sachs Absolute Return Tracker Fund
Fund
S000020314 · Registered fund · Jun 30, 2026
GOLDMAN SACHS TRUST, not summed
|
650 | ||
| 12 |
Amprius, Inc.
13D
CIK 1946058 · Unknown · Oct 23, 2024
|
2,500,071 | ||
| 13 |
JUPITER ASSET MANAGEMENT LTD
13F
CIK 1215838 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,133,397 | ||
| 14 |
LMR Partners LLP
13F
CIK 1578621 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,750,850 | ||
| 15 |
CITADEL ADVISORS LLC
13F
CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,676,344 | ||
| 16 |
PRICE T ROWE ASSOCIATES INC /MD/
13F
CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,635,883 | ||
| 16.1 |
T. Rowe Price New Horizons Fund, Inc.
Fund
S000002106 · Registered fund · Jun 30, 2026
T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
|
949,401 | ||
| 16.2 |
T. Rowe Price Small-Cap Index Fund
Fund
S000051327 · Registered fund · Jun 30, 2026
T. ROWE PRICE INDEX TRUST, INC., not summed
|
20,967 | ||
| 16.3 |
T. Rowe Price Extended Equity Market Index Fund
Fund
S000002090 · Registered fund · Jun 30, 2026
T. ROWE PRICE INDEX TRUST, INC., not summed
|
19,700 | ||
| 17 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,625,154 | ||
| 18 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,457,629 | ||
| 19 |
Hood River Capital Management LLC
13F
CIK 1578177 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,412,516 | ||
| 19.1 |
Hood River New Opportunities Fund
Fund
S000086255 · Registered fund · Jun 30, 2026
Manager Directed Portfolios, not summed
|
448,231 | ||
| 20 |
RENAISSANCE TECHNOLOGIES LLC
13F
CIK 1037389 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,408,925 | ||
| 21 |
VANGUARD EXPLORER FUND
Fund
S000002578 · Registered fund · Jul 31, 2026
VANGUARD EXPLORER FUND, not summed
|
1,378,248 | ||
| 22 |
Driehaus Capital Management LLC
13F
CIK 938206 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,345,269 | ||
| 22.1 |
Driehaus Micro Cap Growth Fund
Fund
S000042829 · Registered fund · Jun 30, 2026
Driehaus Mutual Funds, not summed
|
211,693 | ||
| 23 |
Baird Financial Group, Inc.
13F
CIK 1648711 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,324,909 | ||
| 23.1 |
Strategas Macro Thematic Opportunities ETF
Fund
S000075078 · Registered fund · Jun 30, 2026
ADVISORS' INNER CIRCLE III, not summed
|
888,376 | ||
| 24 |
|
1,274,803 | ||
| 24.1 |
Kang Sun
13D
CIK 1476220 · Unknown · Oct 23, 2024
|
7,766,174 | ||
| 25 |
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND
13F
CIK 1535845 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,248,700 | ||
| 26 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,229,628 | ||
| 26.1 |
Small Cap Index Fund
Fund
S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
|
69,477 | ||
| 26.2 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
3,078 | ||
| 27 |
MILLENNIUM MANAGEMENT LLC
13F
CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,208,017 | ||
| 28 |
DEUTSCHE BANK AG\
13F
CIK 948046 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,196,197 | ||
| 28.1 |
DWS Small Cap Index VIP
Fund
S000006223 · Registered fund · Jun 30, 2026
DEUTSCHE DWS INVESTMENTS VIT FUNDS, not summed
|
21,212 | ||
| 29 |
|
1,180,878 | ||
| 30 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,176,959 | ||
| 30.1 |
Schwab U.S. Small-Cap ETF
Fund
S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
626,393 | ||
| 30.2 |
Schwab Small-Cap Index Fund
Fund
S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
333,829 | ||
| 30.3 |
Schwab Total Stock Market Index Fund
Fund
S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
|
81,967 | ||
| 30.4 |
Schwab U.S. Broad Market ETF
Fund
S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
|
75,316 | ||
| 31 |
Point72 Asset Management, L.P.
13F
CIK 1603466 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,139,811 | ||
| 32 |
Qube Research & Technologies Ltd
13F
CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,136,175 | ||
| 33 |
SUSQUEHANNA INTERNATIONAL GROUP, LLP
13F
CIK 1446194 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,100,269 | ||
| 34 |
Trexquant Investment LP
13F
CIK 1633445 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,097,532 | ||
| 35 |
FIRST TRUST ADVISORS LP
13F
CIK 1125816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,037,344 | ||
| 35.1 |
First Trust Small Cap Growth AlphaDEX Fund
Fund
S000031806 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
|
506,522 | ||
| 35.2 |
First Trust NASDAQ Clean Edge Green Energy Index Fund
Fund
S000015169 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund, not summed
|
350,782 | ||
| 35.3 |
First Trust Small Cap Core AlphaDEX Fund
Fund
S000017339 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
|
188,817 | ||
| 35.4 |
First Trust Multi Cap Growth AlphaDEX Fund
Fund
S000017343 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
|
45,884 | ||
| 35.5 |
First Trust Multi-Manager Small Cap Opportunities ETF
Fund
S000073489 · Registered fund · Aug 31, 2026
First Trust Exchange-Traded Fund VIII, not summed
|
20,766 | ||
| 36 |
Nearwater Capital Markets, Ltd
13F
CIK 1915842 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,034,700 | ||
| 37 |
|
1,005,275 | ||
| 38 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
989,691 | ||
| 39 |
Shannon River Fund Management LLC
13F
CIK 1301050 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
838,887 | ||
| 40 |
|
802,601 | ||
| 40.1 |
Donald R. Dixon
13D
CIK 1045434 · Unknown · Oct 23, 2024
|
7,553,157 | ||
| 41 |
Stefan Constantin Ionel
Insider
CIK 1940928 · Aug 21, 2026
Chief Technology Officer, issuer-wide, not summed
|
771,629 | ||
| 42 |
TUDOR INVESTMENT CORP ET AL
13F
CIK 923093 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
747,428 | ||
| 43 |
IMC-Chicago, LLC
13F
CIK 1452861 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
734,114 | ||
| 44 |
STIFEL FINANCIAL CORP
13F
CIK 720672 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
731,470 | ||
| 45 |
Stephens Investment Management Group LLC
13F
CIK 1314440 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
714,324 | ||
| 46 |
D. E. Shaw & Co., Inc.
13F
CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
671,812 | ||
| 47 |
TimesSquare Capital Management, LLC
13F
CIK 1313816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
641,990 | ||
| 48 |
OBERWEIS ASSET MANAGEMENT INC/
13F
CIK 937886 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
636,200 | ||
| 48.1 |
Oberweis Micro-Cap Fund
Fund
S000010231 · Registered fund · Jun 30, 2026
OBERWEIS FUNDS, not summed
|
613,700 | ||
| 49 |
Stepien Thomas M
Insider
CIK 2067233 · Aug 25, 2026
Director, Chief Executive Officer, issuer-wide, not summed
|
616,010 | ||
| 50 |
VANGUARD RUSSELL 2000 INDEX FUND
Fund
S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
|
591,688 |
12 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 358 holders
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Key facts
CIK
1899287
CUSIP
03214Q108
13F (30d)
36 filings
36 filers
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