AXCELIS TECHNOLOGIES INC (ACLS) Institutional Shareholders
AXCELIS TECHNOLOGIES INC (ACLS) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $5.81B in ACLS holdings during the latest filing period.
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 $526.08M, representing an estimated loss of -44.79% 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
421
Total Reported Value
$5.81B
Largest Holder
Blackrock, Inc.
Largest Position
$952.83M
Insider Transactions (90d)
4
Latest Filing Quarter
Q2 2026
New Institutional Positions
77
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 | $526,081,725 | -$426,749,777 | -44.79% | |
| Fmr Llc | 0.03% | 4,125,902 | $781,652,150 | $431,569,349 | -$350,082,801 | -44.79% | |
| Vanguard Portfolio Management Llc | 0.02% | 2,478,878 | $469,623,437 | $259,290,639 | -$210,332,798 | -44.79% | |
| Vanguard Capital Management Llc | 0.01% | 1,386,518 | $262,675,835 | $145,029,783 | -$117,646,052 | -44.79% | |
| State Street Corp | 0.01% | 1,231,109 | $233,178,562 | $128,774,001 | -$104,404,561 | -44.77% | |
| Victory Capital Management Inc | 0.12% | 1,134,007 | $214,837,627 | $118,617,132 | -$96,220,495 | -44.79% | |
| Reinhart Partners, Llc. | 4.02% | 928,660 | $175,937,874 | $97,137,836 | -$78,800,038 | -44.79% | |
| Geode Capital Management, Llc | 0.01% | 833,607 | $157,956,036 | $87,195,292 | -$70,760,744 | -44.80% | |
| Bnp Paribas Asset Management Holding S.A. | 0.15% | 803,151 | $152,156,957 | $84,009,595 | -$68,147,362 | -44.79% | |
| Dimensional Fund Advisors Lp | 0.02% | 709,266 | $134,347,548 | $74,189,224 | -$60,158,324 | -44.78% | |
| Balyasny Asset Management L.P. | 0.21% | 616,196 | $116,738,332 | $64,454,102 | -$52,284,230 | -44.79% | |
| Primecap Management Co/Ca/ | 0.07% | 610,451 | $115,649,942 | $63,853,175 | -$51,796,767 | -44.79% | |
| Invesco Ltd. | 0.01% | 527,724 | $99,977,311 | $55,199,930 | -$44,777,381 | -44.79% | |
| Charles Schwab Investment Management Inc | 0.01% | 416,230 | $78,854,774 | $43,537,658 | -$35,317,116 | -44.79% | |
| Price T Rowe Associates Inc | 0.01% | 394,455 | $74,730,000 | $41,259,993 | -$33,470,007 | -44.79% | |
| Barrow Hanley Mewhinney & Strauss Llc | 0.23% | 392,240 | $74,309,868 | $41,028,304 | -$33,281,564 | -44.79% | |
| Manufacturers Life Insurance Company, The | 0.06% | 383,760 | $72,703,332 | $40,141,296 | -$32,562,036 | -44.79% | |
| Northern Trust Corp | 0.01% | 382,027 | $72,375,015 | $39,960,024 | -$32,414,991 | -44.79% | |
| American Century Companies Inc | 0.03% | 369,879 | $70,073,577 | $38,689,343 | -$31,384,234 | -44.79% | |
| Morgan Stanley | 0.00% | 366,077 | $69,353,916 | $38,291,654 | -$31,062,262 | -44.79% | |
| Boston Trust Walden Corp | 0.52% | 359,256 | $68,061,049 | $37,578,178 | -$30,482,871 | -44.79% | |
| Emerald Advisers, Llc | 1.47% | 330,469 | $62,607,352 | $34,567,057 | -$28,040,295 | -44.79% | |
| Ubs Group Ag | 0.01% | 320,891 | $60,792,800 | $33,565,199 | -$27,227,601 | -44.79% | |
| Boston Partners | 0.05% | 303,929 | $55,651,466 | $31,790,973 | -$23,860,493 | -42.87% | |
| Goldman Sachs Group Inc | 0.00% | 235,253 | $44,568,681 | $24,607,464 | -$19,961,217 | -44.79% | |
| Vanguard Fiduciary Trust Co | 0.01% | 220,809 | $41,832,265 | $23,096,621 | -$18,735,644 | -44.79% | |
| Emerald Mutual Fund Advisers Trust | 1.46% | 219,443 | $41,573,476 | $22,953,738 | -$18,619,738 | -44.79% | |
| Principal Financial Group Inc | 0.02% | 218,113 | $41,321,508 | $22,814,620 | -$18,506,888 | -44.79% | |
| Allspring Global Investments Holdings, Llc | 0.06% | 219,357 | $39,117,934 | $22,944,742 | -$16,173,192 | -41.34% | |
| Bank Of New York Mellon Corp | 0.01% | 204,964 | $38,830,442 | $21,439,234 | -$17,391,208 | -44.79% | |
| Citigroup Inc | 0.02% | 184,124 | $34,882,292 | $19,259,370 | -$15,622,922 | -44.79% | |
| Millennium Management Llc | 0.02% | 139,242 | $26,379,397 | $14,564,713 | -$11,814,684 | -44.79% | |
| Grantham, Mayo, Van Otterloo & Co. Llc | 0.06% | 135,580 | $25,685,631 | $14,181,668 | -$11,503,963 | -44.79% | |
| Alpine Associates Management Inc. | 1.60% | 134,905 | $25,557,753 | $14,111,063 | -$11,446,690 | -44.79% | |
| Sagefield Capital Lp | 1.88% | 133,770 | $25,342,727 | $13,992,342 | -$11,350,385 | -44.79% | |
| D. E. Shaw & Co., Inc. | 0.02% | 133,044 | $25,205,186 | $13,916,402 | -$11,288,784 | -44.79% | |
| Federated Hermes, Inc. | 0.04% | 132,331 | $25,070,108 | $13,841,823 | -$11,228,285 | -44.79% | |
| First Trust Advisors Lp | 0.01% | 123,278 | $23,355,017 | $12,894,879 | -$10,460,138 | -44.79% | |
| Alberta Investment Management Corp | 0.12% | 107,250 | $20,318,513 | $11,218,350 | -$9,100,163 | -44.79% | |
| Public Sector Pension Investment Board | 0.05% | 105,601 | $20,006,109 | $11,045,865 | -$8,960,244 | -44.79% | |
| Weiss Asset Management Lp | 0.22% | 103,258 | $19,562,228 | $10,800,787 | -$8,761,441 | -44.79% | |
| Kennedy Capital Management Llc | 0.32% | 95,038 | $18,004,949 | $9,940,975 | -$8,063,974 | -44.79% | |
| Bessemer Group Inc | 0.02% | 95,004 | $17,999,000 | $9,937,418 | -$8,061,582 | -44.79% | |
| Old West Investment Management, Llc | 1.81% | 90,334 | $17,113,776 | $9,448,936 | -$7,664,840 | -44.79% | |
| Bank Of America Corp | 0.00% | 90,147 | $17,078,350 | $9,429,376 | -$7,648,974 | -44.79% | |
| Bnp Paribas Financial Markets | 0.01% | 87,705 | $16,615,712 | $9,173,943 | -$7,441,769 | -44.79% | |
| Nuveen, Llc | 0.00% | 81,142 | $15,372,353 | $8,487,453 | -$6,884,900 | -44.79% | |
| Rhumbline Advisers | 0.01% | 76,372 | $14,468,650 | $7,988,511 | -$6,480,139 | -44.79% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.02% | 71,925 | $13,626,191 | $7,523,355 | -$6,102,836 | -44.79% |
| Legal & General Group Plc | 0.00% | 70,350 | $13,327,807 | $7,358,610 | -$5,969,197 | -44.79% |
Frequently asked questions about ACLS
Who owns the most ACLS stock?
The largest holders of ACLS are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for AXCELIS TECHNOLOGIES INC (ACLS).
Is ACLS widely held by superinvestors?
Many widely followed stocks like ACLS appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ACLS is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.