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ACLS · Axcelis Technologies Inc · Shareholders & Ownership

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$113.28 +4.17 (+3.82%)
Market Cap
$3.38B
Shares
30.88M
Volume · Oct 27 91.29K Avg daily vol (3M) 352.42K

Every disclosed holder of ACLS 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 ACLS

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

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group Shares % Out
Institutional (13F) 31,062,017 100.58%
Insiders (Forms 3, 4, 5) 455,946 1.48%
13D/G-only blocks 0 0.00%
Remaining 636,474 -2.06%
Registered funds (N-PORT, not summed) 17,639,627 57.12%

Shares outstanding: 30,881,489, the issuer's latest cover-page count restated onto today's split basis.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

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 ACLS

# Holder Shares
1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
5,029,462
1.1
iShares Core S&P Small-Cap ETF
Fund S000004313 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,851,581
1.2
iShares Russell 2000 ETF
Fund S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
805,510
1.3
iShares Russell 2000 Growth ETF
Fund S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
289,688
1.4
iShares S&P Small-Cap 600 Growth ETF
Fund S000004314 · Registered fund · Jun 30, 2026
iShares Trust, not summed
176,624
1.5
BlackRock Advantage Small Cap Core Fund
Fund S000039982 · Registered fund · Aug 31, 2026
BlackRock Funds, not summed
132,158
2
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
4,125,902
2.1
FMR LLC
13G CIK 315066 · Holding company · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
4,122,402
2.2
Fidelity Contrafund
Fund S000006037 · Registered fund · Jun 30, 2026
Fidelity Contrafund, not summed
412,405
2.3
Strategic Advisers Fidelity U.S. Total Stock Fund
Fund S000061481 · Registered fund · Aug 31, 2026
Fidelity Rutland Square Trust II, not summed
404,800
2.4
Fidelity Stock Selector Small Cap Fund
Fund S000005453 · Registered fund · Jul 31, 2026
Fidelity Capital Trust, not summed
353,907
2.5
Fidelity Small Cap Index Fund
Fund S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
343,166
3
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,478,878
4
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,386,518
5
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,231,109
5.1
State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF
Fund S000041317 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
281,637
5.2
State Street(R) SPDR(R) S & P 600(TM) Small Cap Growth ETF
Fund S000006990 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
112,888
5.3
State Street(R) SPDR(R) S & P 600(TM) Small Cap Value ETF
Fund S000006974 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
57,347
5.4
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
10,867
5.5
State Street(R) SPDR(R) Portfolio S&P 1500(R) Composite Stock Market ETF
Fund S000006973 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
6,514
6
VICTORY CAPITAL MANAGEMENT INC
13F CIK 1040188 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,134,007
6.1
Victory Pioneer Global Equity Fund
Fund S000089821 · Registered fund · May 31, 2026
Victory Portfolios IV, not summed
98,977
6.2
VictoryShares US Small Mid Cap Value Momentum ETF
Fund S000065161 · Registered fund · Jun 30, 2026
Victory Portfolios II, not summed
23,435
6.3
Victory Extended Market Index Fund
Fund S000012941 · Registered fund · Jul 31, 2026
Victory Portfolios III, not summed
3,503
7
REINHART PARTNERS, LLC.
13F CIK 1080298 · Registered investment adviser · Sep 30, 2026
1,060,636
7.1
Reinhart Genesis PMV Fund
Fund S000055903 · Registered fund · Aug 31, 2026
Managed Portfolio Series, not summed
192,845
8
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
976,851
9
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
833,607
10
BNP PARIBAS ASSET MANAGEMENT Holding S.A.
13F CIK 1520354 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
803,151
11
VANGUARD INFORMATION TECHNOLOGY INDEX FUND
Fund S000004452 · Registered fund · May 31, 2026
VANGUARD WORLD FUND, not summed
780,738
12
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
709,266
12.1
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
142,884
12.2
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
100,395
12.3
U.S. MICRO CAP PORTFOLIO
Fund S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
94,628
12.4
Dimensional U.S. Core Equity 2 ETF
Fund S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
55,631
12.5
U.S. CORE EQUITY 1 PORTFOLIO
Fund S000000979 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
46,130
13
VANGUARD SMALL-CAP INDEX FUND
Fund S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
704,939
14
Balyasny Asset Management L.P.
13F CIK 1218710 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
616,196
15
PRIMECAP MANAGEMENT CO/CA/
13F CIK 763212 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
610,451
15.1
PRIMECAP Odyssey Aggressive Growth Fund
Fund S000005541 · Registered fund · Jul 31, 2026
PRIMECAP Odyssey Funds, not summed
575,146
16
Invesco Ltd.
13F CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
527,724
16.1
Invesco Main Street Small Cap Fund
Fund S000064650 · Registered fund · Jun 30, 2026
AIM Growth Series (Invesco Growth Series), not summed
88,593
16.2
Invesco Dorsey Wright Technology Momentum ETF
Fund S000013110 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
75,623
16.3
Invesco S&P SmallCap Information Technology ETF
Fund S000028301 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
61,934
16.4
Invesco V.I. Main Street Small Cap Fund
Fund S000064664 · Registered fund · Jun 30, 2026
AIM Variable Insurance Funds (Invesco Variable Insurance Funds), not summed
49,238
16.5
Invesco RAFI US 1500 Small-Mid ETF
Fund S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
45,899
17
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
446,494
18
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
416,230
18.1
Schwab U.S. Small-Cap ETF
Fund S000026636 · Registered fund · Aug 31, 2026
SCHWAB STRATEGIC TRUST, not summed
145,694
18.2
Schwab Small-Cap Index Fund
Fund S000005912 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
76,038
18.3
Schwab Fundamental U.S. Small Company ETF
Fund S000040878 · Registered fund · Aug 31, 2026
SCHWAB STRATEGIC TRUST, not summed
75,533
18.4
Schwab Small-Cap Equity Fund
Fund S000005516 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
20,188
18.5
Schwab Fundamental U.S. Small Company Index Fund
Fund S000016767 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
19,691
19
PRICE T ROWE ASSOCIATES INC /MD/
13F CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
394,455
19.1
T. Rowe Price Integrated U.S. Small-Cap Growth Equity Fund
Fund S000002074 · Registered fund · Jun 30, 2026
T. ROWE PRICE INTEGRATED EQUITY FUNDS, INC., not summed
198,158
19.2
T. Rowe Price Science & Technology Fund, Inc.
Fund S000002119 · Registered fund · Jun 30, 2026
T. ROWE PRICE SCIENCE & TECHNOLOGY FUND, INC., not summed
53,900
19.3
T. Rowe Price Small-Cap Index Fund
Fund S000051327 · Registered fund · Jun 30, 2026
T. ROWE PRICE INDEX TRUST, INC., not summed
4,728
19.4
T. Rowe Price Extended Equity Market Index Fund
Fund S000002090 · Registered fund · Jun 30, 2026
T. ROWE PRICE INDEX TRUST, INC., not summed
4,702
20
BARROW HANLEY MEWHINNEY & STRAUSS LLC
13F CIK 313028 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
392,240
21
MANUFACTURERS LIFE INSURANCE COMPANY, THE
13F CIK 928047 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
383,760
22
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
382,027
22.1
Small Cap Index Fund
Fund S000001245 · Registered fund · Jun 30, 2026
Northern Funds, not summed
15,869
22.2
Small Cap Core Fund
Fund S000001244 · Registered fund · Jun 30, 2026
Northern Funds, not summed
6,871
22.3
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
1,837
23
AMERICAN CENTURY COMPANIES INC
13F CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
369,879
23.1
Small Cap Value Fund
Fund S000005781 · Registered fund · Jun 30, 2026
American Century Capital Portfolios, Inc., not summed
160,000
23.2
Small Company Fund
Fund S000005981 · Registered fund · Jun 30, 2026
American Century Quantitative Equity Funds, Inc., not summed
980
24
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
366,077
24.1
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
27
25
Boston Trust Walden Corp
13F CIK 1534866 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
359,256
26
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
352,333
27
EMERALD ADVISERS, LLC
13F CIK 1015083 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
330,469
28
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
320,891
29
Boston Partners
13F CIK 1386060 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
303,929
30
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
235,253
30.1
Goldman Sachs Small Cap Value Fund
Fund S000009323 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
58,008
30.2
Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF
Fund S000048296 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
6,798
30.3
Multi-Manager U.S. Small Cap Equity Fund
Fund S000051363 · Registered fund · Apr 30, 2026
Goldman Sachs Trust II, not summed
4,461
30.4
Goldman Sachs Absolute Return Tracker Fund
Fund S000020314 · Registered fund · Aug 31, 2026
GOLDMAN SACHS TRUST, not summed
419
31
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
220,809
32
EMERALD MUTUAL FUND ADVISERS TRUST
13F CIK 1352895 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
219,443
32.1
Emerald Growth Fund
Fund S000036390 · Registered fund · Apr 30, 2026
FINANCIAL INVESTORS TRUST, not summed
87,310
33
Allspring Global Investments Holdings, LLC
13F CIK 1890906 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
219,357
33.1
Allspring Special Small Cap Value Fund
Fund S000029108 · Registered fund · Jun 30, 2026
ALLSPRING FUNDS TRUST, not summed
143,518
33.2
Allspring Emerging Growth Fund
Fund S000015703 · Registered fund · Jul 31, 2026
ALLSPRING FUNDS TRUST, not summed
11,428
33.3
Allspring VT Small Cap Growth Fund
Fund S000007228 · Registered fund · Jun 30, 2026
Allspring VARIABLE TRUST, not summed
4,900
33.4
Allspring Disciplined Small Cap Fund
Fund S000007342 · Registered fund · Jun 30, 2026
ALLSPRING FUNDS TRUST, not summed
3,017
34
PRINCIPAL FINANCIAL GROUP INC
13F CIK 1126328 · Insurance company · Jun 30, 2026
carried, not yet filed for the newest quarter
218,113
34.1
SmallCap Growth Fund I
Fund S000007175 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
86,884
34.2
Principal U.S. Small-Cap ETF
Fund S000055159 · Registered fund · Jun 30, 2026
Principal Exchange-Traded Funds, not summed
67,066
34.3
SmallCap S&P 600 Index Fund
Fund S000007203 · Registered fund · Jul 31, 2026
Principal Funds, Inc, not summed
22,645
35
Bank of New York Mellon Corp
13F CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
204,964
35.1
BNY Mellon US Small Cap Core Equity ETF
Fund S000067262 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
1,129
36
VANGUARD TAX-MANAGED SMALL-CAP FUND
Fund S000004387 · Registered fund · Jun 30, 2026
VANGUARD TAX-MANAGED FUNDS, not summed
194,154
37
CITIGROUP INC
13F CIK 831001 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
184,124
38
VANGUARD RUSSELL 2000 INDEX FUND
Fund S000030003 · Registered fund · May 31, 2026
VANGUARD SCOTTSDALE FUNDS, not summed
159,533
39
Low Russell
Insider CIK 1689237 · May 18, 2026
Director, PRESIDENT AND CEO, issuer-wide
154,900
40
American Beacon Small Cap Value Fund
Fund S000001818 · Registered fund · Jul 31, 2026
AMERICAN BEACON FUNDS, not summed
142,459
41
MILLENNIUM MANAGEMENT LLC
13F CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
139,242
42
Grantham, Mayo, Van Otterloo & Co. LLC
13F CIK 1352662 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
135,580
42.1
GMO Small Cap Quality Fund
Fund S000077554 · Registered fund · May 31, 2026
GMO TRUST, not summed
90,085
42.2
GMO Climate Change Fund
Fund S000056707 · Registered fund · May 31, 2026
GMO TRUST, not summed
19,355
42.3
GMO Alternative Allocation Fund
Fund S000065268 · Registered fund · May 31, 2026
GMO TRUST, not summed
8,674
42.4
GMO U.S. Equity Fund
Fund S000004081 · Registered fund · May 31, 2026
GMO TRUST, not summed
6,873
42.5
GMO U.S. Small Cap Value Fund
Fund S000065871 · Registered fund · May 31, 2026
GMO TRUST, not summed
6,822
43
ALPINE ASSOCIATES MANAGEMENT INC.
13F CIK 1396835 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
134,905
44
Sagefield Capital LP
13F CIK 1771179 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
133,770
45
D. E. Shaw & Co., Inc.
13F CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
133,044
46
FEDERATED HERMES, INC.
13F CIK 1056288 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
132,331
47
Boston Trust Walden Small Cap Fund
Fund S000009927 · Registered fund · Jun 30, 2026
Boston Trust Walden Funds, not summed
132,150
48
Emerald Growth Fund
Fund S000093696 · Registered fund · Jul 31, 2026
RBB Fund, Inc., not summed
132,022
49
FIRST TRUST ADVISORS LP
13F CIK 1125816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
123,278
49.1
First Trust Nasdaq Semiconductor ETF
Fund S000053947 · Registered fund · Jun 30, 2026
First Trust Exchange-Traded Fund VI, not summed
91,902
49.2
First Trust Active Factor Mid Cap ETF
Fund S000066789 · Registered fund · Aug 31, 2026
First Trust Exchange-Traded Fund VIII, not summed
9,761
49.3
First Trust Active Factor Small Cap ETF
Fund S000066790 · Registered fund · Aug 31, 2026
First Trust Exchange-Traded Fund VIII, not summed
5,120
49.4
First Trust Small Cap Core AlphaDEX Fund
Fund S000017339 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
4,604
49.5
First Trust Small Cap Value AlphaDEX Fund
Fund S000031807 · Registered fund · Jul 31, 2026
First Trust Exchange-Traded AlphaDEX Fund, not summed
1,238
50
JNL Multi-Manager Small Cap Value Fund
Fund S000001798 · Registered fund · Jun 30, 2026
JNL Series Trust, not summed
114,227

96 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 574 holders

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Key facts CIK 1113232 CUSIP 054540208 13F (30d) 75 filings 71 filers Visit website Investor relations