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Equibles

ACLS

Axcelis Technologies Inc

Company with tickers: ACLS

CIK
1113232
CUSIP
054540208
Shares Outstanding
30,733,897
13F Activity (30d)
205 filings 201 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 378
Total Value: $3,056,779,169
Total Shares: 32,840,346
Showing 1–100 of 387 holdings by value · page 1 of 4

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 378 13F filers · Δ vs Dec 31, 2025
Top Holder
15.0%
Jun 2023 → Mar 2026 · range 9.8% – 20.0%
−0.3 pts
Top 5
39.3%
Jun 2023 → Mar 2026 · range 38.5% – 43.6%
−3.9 pts
Top 10
56.9%
Jun 2023 → Mar 2026 · range 52.2% – 58.1%
−1.2 pts
HHI
489
Jun 2023 → Mar 2026 · range 427 – 672
Broadly held−73

Quarterly Activity

vs Dec 31, 2025
New
70
Increased
101
Decreased
134
Sold Out
61
Unchanged
73
Holder count: +9
Institutional value: +20.9%
Shares held: +4.3%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega FMR LLC +1,820,518 2,431,121
Large Balyasny Asset Management L.P. +1,121,037 1,364,540
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE +477,705 491,745
Mega MORGAN STANLEY +231,416 581,636
Mega UBS Group AG +163,849 377,237

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega VICTORY CAPITAL MANAGEMENT INC −528,399 1,279,005
Mega Invesco Ltd. −313,822 165,075
Mega AMERICAN CENTURY COMPANIES INC −281,732 951,914
Mega CITADEL ADVISORS LLC −183,142 64,705
Large VOLORIDGE INVESTMENT MANAGEMENT, LLC −176,467 44,246

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 2,488,293 $231,610,312
Mega VANGUARD CAPITAL MANAGEMENT LLC 1,382,770 $128,708,231
Mega VANGUARD FIDUCIARY TRUST CO 200,465 $18,659,282
Mid EMERALD ADVISERS, LLC 96,238 $8,957,833
Mid Sagefield Capital LP 82,238 $7,654,712

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 4,122,529 $331,203,977
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 212,050 $17,036,097
Large Clark Capital Management Group, Inc. 110,294 $8,861,019
Mid BlackBarn Capital Partners LP 96,573 $7,758,674
Mega NORGES BANK 88,147 $7,081,729
Filter: New 70 Increased 101 Reduced 134 Sold out 61 Unchanged 73
Showing 100 of 387
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $459,514,917 15.03% 4,936,774
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $231,610,312 7.58% 2,488,293
Mega FMR LLC $226,288,741 7.40% 2,431,121
Mid REINHART PARTNERS, LLC. $154,302,904 5.05% 1,657,745
Mega VANGUARD CAPITAL MANAGEMENT LLC $128,708,231 4.21% 1,382,770
Large Balyasny Asset Management L.P. $127,011,383 4.16% 1,364,540
Mega VICTORY CAPITAL MANAGEMENT INC $119,049,785 3.89% 1,279,005
Mega STATE STREET CORP $110,676,308 3.62% 1,189,045
Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. $93,641,085 3.06% 1,006,028
Mega AMERICAN CENTURY COMPANIES INC $88,604,155 2.90% 951,914
Mega DIMENSIONAL FUND ADVISORS LP $78,568,547 2.57% 844,097
Mega GEODE CAPITAL MANAGEMENT, LLC $75,512,452 2.47% 811,264
Mega PRIMECAP MANAGEMENT CO/CA/ $61,307,328 2.01% 658,652
Mega MORGAN STANLEY $54,138,676 1.77% 581,636
Mega D. E. Shaw & Co., Inc. $50,674,706 1.66% 544,421
Mega GOLDMAN SACHS GROUP INC $46,318,841 1.52% 497,624
Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance $45,771,624 1.50% 491,745
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $41,492,178 1.36% 445,769
Large LSV ASSET MANAGEMENT $39,977,860 1.31% 429,500
Mega NORTHERN TRUST CORP Bank $38,786,712 1.27% 416,703
Large Boston Trust Walden Corp $35,233,106 1.15% 378,525
Mega UBS Group AG $35,113,218 1.15% 377,237
Mega PRICE T ROWE ASSOCIATES INC /MD/ $33,713,762 1.10% 362,202
Large Boston Partners $31,672,796 1.04% 340,275
Large Grantham, Mayo, Van Otterloo & Co. LLC $31,161,880 1.02% 334,786
Large Allspring Global Investments Holdings, LLC $24,064,530 0.79% 258,536
Mega JPMORGAN CHASE & CO $20,730,217 0.68% 222,714
Mega PRINCIPAL FINANCIAL GROUP INC $19,565,601 0.64% 210,202
Large FEDERATED HERMES, INC. $19,472,149 0.64% 209,198
Mega VANGUARD FIDUCIARY TRUST CO Bank $18,659,282 0.61% 200,465
Mid SEGALL BRYANT & HAMILL, LLC $18,650,532 0.61% 200,371
Mega Bank of New York Mellon Corp Bank $18,585,466 0.61% 199,672
Mega TWO SIGMA INVESTMENTS, LP $18,389,443 0.60% 197,566
Mid KENNEDY CAPITAL MANAGEMENT LLC $16,569,729 0.54% 178,016
Mega Invesco Ltd. $15,365,177 0.50% 165,075
Mega BNP PARIBAS ARBITRAGE, SA $13,466,628 0.44% 144,678
Mega FIRST TRUST ADVISORS LP $12,824,469 0.42% 137,779
Mid ROYCE & ASSOCIATES LP $11,661,062 0.38% 125,280
Mega BANK OF AMERICA CORP /DE/ Bank $10,331,785 0.34% 110,999
Large Public Sector Pension Investment Board Pension $10,219,346 0.33% 109,791
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $9,847,864 0.32% 105,800
Large First Eagle Investment Management, LLC $9,359,286 0.31% 100,551
Mid EMERALD ADVISERS, LLC $8,957,833 0.29% 96,238
Mega RHUMBLINE ADVISERS $8,126,535 0.27% 87,307
Mid Sagefield Capital LP $7,654,712 0.25% 82,238
Mega AMERIPRISE FINANCIAL INC $7,324,929 0.24% 78,695
Large Creative Planning $7,233,432 0.24% 77,712
Mid Portolan Capital Management, LLC $7,182,797 0.23% 77,168
Mega Legal & General Group Plc $6,693,288 0.22% 71,909
Mega Nuveen, LLC $6,644,514 0.22% 71,385
Mid Susquehanna Portfolio Strategies, LLC $6,349,266 0.21% 68,213
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $6,008,309 0.20% 64,550
Mega Swiss National Bank Bank $5,696,496 0.19% 61,200
Mega WELLS FARGO & COMPANY/MN $4,812,328 0.16% 51,701
Large Holocene Advisors, LP $4,800,601 0.16% 51,575
Small QSM Asset Management Ltd $4,800,228 0.16% 51,571
Large PEAK6 LLC $4,495,764 0.15% 48,300
Large MERCER GLOBAL ADVISORS INC /ADV $4,465,606 0.15% 47,976
Large GREAT LAKES ADVISORS, LLC $4,430,048 0.14% 47,594
Mid EMERALD MUTUAL FUND ADVISERS TRUST Mutual Fund $4,413,108 0.14% 47,412
Large SEI INVESTMENTS CO $4,191,857 0.14% 45,035
Small GLOBEFLEX CAPITAL L P $4,137,871 0.14% 44,455
Large VOLORIDGE INVESTMENT MANAGEMENT, LLC $4,118,417 0.13% 44,246
Mega CITADEL ADVISORS LLC $4,076,904 0.13% 43,800
Mid NEEDHAM INVESTMENT MANAGEMENT LLC $3,955,900 0.13% 42,500
Small Old West Investment Management, LLC $3,954,131 0.13% 42,481
Mid HARBOR CAPITAL ADVISORS, INC. $3,893,629 0.13% 41,831
Mid ARGA Investment Management, LP $3,854,256 0.13% 41,408
Large STATE OF WISCONSIN INVESTMENT BOARD $3,835,547 0.13% 41,207
Mid OSSIAM $3,788,356 0.12% 40,700
Mega Amundi $3,781,560 0.12% 40,627
Large Allianz Asset Management GmbH $3,735,579 0.12% 40,133
Mega AQR CAPITAL MANAGEMENT LLC $3,724,593 0.12% 40,015
Mid Emerald Investment Advisers, LLC $3,701,233 0.12% 39,764
Small ISTHMUS PARTNERS, LLC $3,663,349 0.12% 39,357
Large Empowered Funds, LLC $3,638,216 0.12% 39,087
Mid BRIDGES INVESTMENT MANAGEMENT INC $3,596,330 0.12% 38,637
Large BESSEMER GROUP INC $3,537,132 0.12% 38,001
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $3,389,973 0.11% 36,420
Mid Alberta Investment Management Corp $3,327,610 0.11% 35,750
Mega BARCLAYS PLC $3,292,330 0.11% 35,371
Mid Voleon Capital Management LP $3,278,370 0.11% 35,221
Mega ALLIANCEBERNSTEIN L.P. $3,210,236 0.11% 34,489
Large TORONTO DOMINION BANK Bank $3,165,464 0.10% 34,008
Large Squarepoint Ops LLC $3,098,726 0.10% 33,291
Mega ENVESTNET ASSET MANAGEMENT INC $2,958,175 0.10% 31,781
Large PRUDENTIAL FINANCIAL INC $2,920,571 0.10% 31,377
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $2,866,864 0.09% 30,800
Small Inspire Advisors, LLC $2,737,575 0.09% 29,411
Mega Mitsubishi UFJ Asset Management Co., Ltd. $2,710,582 0.09% 29,121
Mega DEUTSCHE BANK AG\ Bank $2,686,194 0.09% 28,859
Mega VANGUARD ASSET MANAGEMENT, Ltd $2,531,682 0.08% 27,199
Mega FRANKLIN RESOURCES INC $2,487,002 0.08% 26,719
Large CANADA LIFE ASSURANCE Co Insurance $2,341,334 0.08% 25,154
Mid ABN AMRO INVESTMENT SOLUTIONS $2,294,422 0.08% 24,650
Mega CITIGROUP INC $2,293,955 0.08% 24,645
Mid PARADIGM CAPITAL MANAGEMENT INC/NY $2,233,920 0.07% 24,000
Mega JANE STREET GROUP, LLC $2,224,612 0.07% 23,900
Small Yakira Capital Management, Inc. $2,105,376 0.07% 22,619
Large STIFEL FINANCIAL CORP $2,102,118 0.07% 22,584

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