ACLS Institutional Ownership & Shareholders
AXCELIS TECHNOLOGIES INC (ACLS) is currently held by 402 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $5.71B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of ACLS tracked by InsiderSet, reporting ownership valued at approximately $952.83M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $503.30M, representing an estimated loss of -47.18% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 61% of the total disclosed ACLS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Fmr Llc, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in AXCELIS TECHNOLOGIES INC (ACLS).
This page ranks the largest institutional ACLS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
402
Total Reported Value
$5.71B
Largest Holder
Blackrock, Inc.
Largest Position
$952.83M
Insider Transactions (90d)
2
Latest Filing Quarter
Q2 2026
New Institutional Positions
78
Funds Exiting Positions
1
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 5,029,462 | $952,831,502 | $503,298,262 | -$449,533,240 | -47.18% | |
| Fmr Llc | 0.03% | 4,125,902 | $781,652,150 | $412,879,013 | -$368,773,137 | -47.18% | |
| Vanguard Portfolio Management Llc | 0.02% | 2,478,878 | $469,623,437 | $248,061,321 | -$221,562,116 | -47.18% | |
| Vanguard Capital Management Llc | 0.01% | 1,386,518 | $262,675,835 | $138,748,856 | -$123,926,979 | -47.18% | |
| State Street Corp | 0.01% | 1,231,109 | $233,178,562 | $123,197,078 | -$109,981,484 | -47.17% | |
| Victory Capital Management Inc | 0.12% | 1,134,007 | $214,837,627 | $113,480,080 | -$101,357,547 | -47.18% | |
| Geode Capital Management, Llc | 0.01% | 833,607 | $157,956,036 | $83,419,052 | -$74,536,984 | -47.19% | |
| Bnp Paribas Asset Management Holding S.A. | 0.15% | 803,151 | $152,156,957 | $80,371,321 | -$71,785,636 | -47.18% | |
| Reinhart Partners, Llc. | 3.38% | 1,060,636 | $139,134,230 | $106,137,845 | -$32,996,385 | -23.72% | |
| Dimensional Fund Advisors Lp | 0.02% | 709,266 | $134,347,548 | $70,976,249 | -$63,371,299 | -47.17% | |
| Balyasny Asset Management L.P. | 0.21% | 616,196 | $116,738,332 | $61,662,734 | -$55,075,598 | -47.18% | |
| Primecap Management Co/Ca/ | 0.07% | 610,451 | $115,649,942 | $61,087,832 | -$54,562,110 | -47.18% | |
| Invesco Ltd. | 0.01% | 527,724 | $99,977,311 | $52,809,341 | -$47,167,970 | -47.18% | |
| Charles Schwab Investment Management Inc | 0.01% | 416,230 | $78,854,774 | $41,652,136 | -$37,202,638 | -47.18% | |
| Price T Rowe Associates Inc | 0.01% | 394,455 | $74,730,000 | $39,473,112 | -$35,256,888 | -47.18% | |
| Barrow Hanley Mewhinney & Strauss Llc | 0.23% | 392,240 | $74,309,868 | $39,251,457 | -$35,058,411 | -47.18% | |
| Manufacturers Life Insurance Company, The | 0.06% | 383,760 | $72,703,332 | $38,402,863 | -$34,300,469 | -47.18% | |
| Northern Trust Corp | 0.01% | 382,027 | $72,375,015 | $38,229,442 | -$34,145,573 | -47.18% | |
| American Century Companies Inc | 0.03% | 369,879 | $70,073,577 | $37,013,792 | -$33,059,785 | -47.18% | |
| Morgan Stanley | 0.00% | 366,077 | $69,353,916 | $36,633,325 | -$32,720,591 | -47.18% | |
| Emerald Advisers, Llc | 1.47% | 330,469 | $62,607,352 | $33,070,033 | -$29,537,319 | -47.18% | |
| Ubs Group Ag | 0.01% | 320,891 | $60,792,800 | $32,111,562 | -$28,681,238 | -47.18% | |
| Boston Partners | 0.05% | 303,929 | $55,651,466 | $30,414,175 | -$25,237,291 | -45.35% | |
| Boston Trust Walden Corp | 0.36% | 340,419 | $44,656,165 | $34,065,729 | -$10,590,436 | -23.72% | |
| Goldman Sachs Group Inc | 0.00% | 235,253 | $44,568,681 | $23,541,768 | -$21,026,913 | -47.18% | |
| Vanguard Fiduciary Trust Co | 0.01% | 220,809 | $41,832,265 | $22,096,357 | -$19,735,908 | -47.18% | |
| Emerald Mutual Fund Advisers Trust | 1.46% | 219,443 | $41,573,476 | $21,959,661 | -$19,613,815 | -47.18% | |
| Allspring Global Investments Holdings, Llc | 0.06% | 219,357 | $39,117,934 | $21,951,055 | -$17,166,879 | -43.88% | |
| Bank Of New York Mellon Corp | 0.01% | 204,964 | $38,830,442 | $20,510,747 | -$18,319,695 | -47.18% | |
| Citigroup Inc | 0.02% | 184,124 | $34,882,292 | $18,425,289 | -$16,457,003 | -47.18% | |
| Principal Financial Group Inc | 0.01% | 208,403 | $27,338,305 | $20,854,888 | -$6,483,417 | -23.72% | |
| Millennium Management Llc | 0.02% | 139,242 | $26,379,397 | $13,933,947 | -$12,445,450 | -47.18% | |
| Grantham, Mayo, Van Otterloo & Co. Llc | 0.06% | 135,580 | $25,685,631 | $13,567,491 | -$12,118,140 | -47.18% | |
| Alpine Associates Management Inc. | 1.60% | 134,905 | $25,557,753 | $13,499,943 | -$12,057,810 | -47.18% | |
| Sagefield Capital Lp | 1.88% | 133,770 | $25,342,727 | $13,386,364 | -$11,956,363 | -47.18% | |
| D. E. Shaw & Co., Inc. | 0.02% | 133,044 | $25,205,186 | $13,313,713 | -$11,891,473 | -47.18% | |
| Federated Hermes, Inc. | 0.04% | 132,331 | $25,070,108 | $13,242,363 | -$11,827,745 | -47.18% | |
| First Trust Advisors Lp | 0.01% | 123,278 | $23,355,017 | $12,336,429 | -$11,018,588 | -47.18% | |
| Alberta Investment Management Corp | 0.12% | 107,250 | $20,318,513 | $10,732,508 | -$9,586,006 | -47.18% | |
| Public Sector Pension Investment Board | 0.05% | 105,601 | $20,006,109 | $10,567,492 | -$9,438,617 | -47.18% | |
| Weiss Asset Management Lp | 0.22% | 103,258 | $19,562,228 | $10,333,028 | -$9,229,200 | -47.18% | |
| Kennedy Capital Management Llc | 0.32% | 95,038 | $18,004,949 | $9,510,453 | -$8,494,496 | -47.18% | |
| Bessemer Group Inc | 0.02% | 95,004 | $17,999,000 | $9,507,050 | -$8,491,950 | -47.18% | |
| Old West Investment Management, Llc | 1.81% | 90,334 | $17,113,776 | $9,039,723 | -$8,074,053 | -47.18% | |
| Bank Of America Corp | 0.00% | 90,147 | $17,078,350 | $9,021,010 | -$8,057,340 | -47.18% | |
| Bnp Paribas Financial Markets | 0.01% | 87,705 | $16,615,712 | $8,776,639 | -$7,839,073 | -47.18% | |
| Nuveen, Llc | 0.00% | 81,142 | $15,372,353 | $8,119,880 | -$7,252,473 | -47.18% | |
| Rhumbline Advisers | 0.01% | 76,372 | $14,468,650 | $7,642,546 | -$6,826,104 | -47.18% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.02% | 71,925 | $13,626,191 | $7,197,535 | -$6,428,656 | -47.18% |
| Legal & General Group Plc | 0.00% | 70,350 | $13,327,807 | $7,039,924 | -$6,287,883 | -47.18% |
Frequently asked questions about ACLS
Who are the largest institutional holders of ACLS?
The largest institutional holders of ACLS reported in the latest SEC Form 13F filings include Blackrock, Inc., Fmr Llc, Vanguard Portfolio Management Llc, Vanguard Capital Management Llc, and State Street Corp. InsiderSet ranks institutional holders by their latest reported ACLS position.
What is ACLS institutional ownership?
This page tracks ACLS positions reported by institutional investment managers through SEC Form 13F. AXCELIS TECHNOLOGIES INC (ACLS) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ACLS?
InsiderSet currently tracks 402 institutional managers reporting ACLS holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of ACLS shareholders.
How much ACLS stock do institutions own?
Institutional investment managers disclosed approximately $5.71B in ACLS holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ACLS institutional ownership last updated?
The latest ACLS institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional ACLS holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its ACLS position after the reporting date.
Are institutions buying or selling ACLS?
Institutional buying and selling can be analyzed by comparing ACLS positions across consecutive 13F reporting periods. InsiderSet's ACLS Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ACLS ownership changes.
How has ACLS institutional ownership changed over time?
InsiderSet tracks ACLS institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.