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 $2.98B 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 $459.51M in its March 31, 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 $643.66M, representing an estimated gain of +40.07% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 59% of the total disclosed ACLS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, Fmr 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
380
Total Reported Value
$2.98B
Largest Holder
Blackrock, Inc.
Largest Position
$459.51M
Insider Transactions (90d)
21
Latest Filing Quarter
Q2 2026
New Institutional Positions
82
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% | 4,936,774 | $459,514,886 | $643,656,594 | +$184,141,708 | +40.07% | |
| Vanguard Portfolio Management Llc | 0.01% | 2,488,293 | $231,610,312 | $324,423,641 | +$92,813,329 | +40.07% | |
| Fmr Llc | 0.01% | 2,431,121 | $226,288,732 | $316,969,556 | +$90,680,824 | +40.07% | |
| Reinhart Partners, Llc. | 4.02% | 928,660 | $175,937,874 | $121,078,691 | -$54,859,183 | -31.18% | |
| Vanguard Capital Management Llc | 0.00% | 1,382,770 | $128,708,232 | $180,285,553 | +$51,577,321 | +40.07% | |
| Balyasny Asset Management L.P. | 0.25% | 1,364,540 | $127,011,383 | $177,908,725 | +$50,897,342 | +40.07% | |
| Victory Capital Management Inc | 0.08% | 1,279,005 | $119,049,785 | $166,756,672 | +$47,706,887 | +40.07% | |
| State Street Corp | 0.00% | 1,189,045 | $110,676,309 | $155,027,687 | +$44,351,378 | +40.07% | |
| Bnp Paribas Asset Management Holding S.A. | 0.11% | 1,006,028 | $93,641,086 | $131,165,931 | +$37,524,845 | +40.07% | |
| American Century Companies Inc | 0.05% | 951,914 | $88,604,155 | $124,110,547 | +$35,506,392 | +40.07% | |
| Dimensional Fund Advisors Lp | 0.02% | 844,097 | $78,565,010 | $110,053,367 | +$31,488,357 | +40.08% | |
| Geode Capital Management, Llc | 0.00% | 811,264 | $75,526,658 | $105,772,600 | +$30,245,942 | +40.05% | |
| Boston Trust Walden Corp | 0.52% | 359,256 | $68,061,049 | $46,839,797 | -$21,221,252 | -31.18% | |
| Primecap Management Co/Ca/ | 0.05% | 658,652 | $61,307,328 | $85,875,048 | +$24,567,720 | +40.07% | |
| Morgan Stanley | 0.00% | 581,636 | $54,138,745 | $75,833,702 | +$21,694,957 | +40.07% | |
| D. E. Shaw & Co., Inc. | 0.04% | 544,421 | $50,674,707 | $70,981,610 | +$20,306,903 | +40.07% | |
| Goldman Sachs Group Inc | 0.01% | 497,624 | $46,318,842 | $64,880,217 | +$18,561,375 | +40.07% | |
| Manufacturers Life Insurance Company, The | 0.04% | 491,745 | $45,771,625 | $64,113,713 | +$18,342,088 | +40.07% | |
| Charles Schwab Investment Management Inc | 0.01% | 445,769 | $41,492,179 | $58,119,362 | +$16,627,183 | +40.07% | |
| Northern Trust Corp | 0.01% | 416,703 | $38,786,715 | $54,329,737 | +$15,543,022 | +40.07% | |
| Ubs Group Ag | 0.01% | 377,237 | $35,113,220 | $49,184,160 | +$14,070,940 | +40.07% | |
| Boston Partners | 0.03% | 340,275 | $31,791,257 | $44,365,055 | +$12,573,798 | +39.55% | |
| Grantham, Mayo, Van Otterloo & Co. Llc | 0.08% | 334,786 | $31,161,881 | $43,649,399 | +$12,487,518 | +40.07% | |
| Allspring Global Investments Holdings, Llc | 0.04% | 258,536 | $24,692,774 | $33,707,924 | +$9,015,150 | +36.51% | |
| Segall Bryant & Hamill, Llc | 0.32% | 227,697 | $19,632,034 | $29,687,135 | +$10,055,101 | +51.22% | |
| Principal Financial Group Inc | 0.01% | 210,202 | $19,565,602 | $27,406,137 | +$7,840,535 | +40.07% | |
| Federated Hermes, Inc. | 0.03% | 209,198 | $19,472,150 | $27,275,235 | +$7,803,085 | +40.07% | |
| Vanguard Fiduciary Trust Co | 0.00% | 200,465 | $18,659,282 | $26,136,627 | +$7,477,345 | +40.07% | |
| Bank Of New York Mellon Corp | 0.00% | 199,672 | $18,585,499 | $26,033,235 | +$7,447,736 | +40.07% | |
| Two Sigma Investments, Lp | 0.02% | 197,566 | $18,389,443 | $25,758,655 | +$7,369,212 | +40.07% | |
| Kennedy Capital Management Llc | 0.35% | 178,016 | $16,569,729 | $23,209,726 | +$6,639,997 | +40.07% | |
| Invesco Ltd. | 0.00% | 165,075 | $15,365,182 | $21,522,479 | +$6,157,297 | +40.07% | |
| Bnp Paribas Financial Markets | 0.01% | 144,678 | $13,466,628 | $18,863,118 | +$5,396,490 | +40.07% | |
| First Trust Advisors Lp | 0.01% | 137,779 | $12,824,469 | $17,963,626 | +$5,139,157 | +40.07% | |
| Royce & Associates Lp | 0.12% | 125,280 | $11,661,062 | $16,334,006 | +$4,672,944 | +40.07% | |
| Bank Of America Corp | 0.00% | 110,999 | $10,331,787 | $14,472,050 | +$4,140,263 | +40.07% | |
| Public Sector Pension Investment Board | 0.03% | 109,791 | $10,219,346 | $14,314,551 | +$4,095,205 | +40.07% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.01% | 100,551 | $9,359,287 | $13,109,839 | +$3,750,552 | +40.07% |
| Emerald Advisers, Llc | 0.28% | 96,238 | $8,957,833 | $12,547,510 | +$3,589,677 | +40.07% | |
| Rhumbline Advisers | 0.01% | 87,307 | $8,126,512 | $11,383,087 | +$3,256,575 | +40.07% | |
| Sagefield Capital Lp | 0.55% | 82,238 | $7,654,713 | $10,722,190 | +$3,067,477 | +40.07% | |
| Ameriprise Financial Inc | 0.00% | 78,695 | $7,324,962 | $10,260,254 | +$2,935,292 | +40.07% | |
| Creative Planning | 0.00% | 77,712 | $7,233,414 | $10,132,091 | +$2,898,677 | +40.07% | |
| Portolan Capital Management, Llc | 0.38% | 77,168 | $7,182,797 | $10,061,164 | +$2,878,367 | +40.07% | |
| Legal & General Group Plc | 0.00% | 71,909 | $6,693,290 | $9,375,495 | +$2,682,205 | +40.07% | |
| Nuveen, Llc | 0.00% | 71,385 | $6,644,516 | $9,307,176 | +$2,662,660 | +40.07% | |
| Susquehanna Portfolio Strategies, Llc | 0.09% | 68,213 | $6,349,266 | $8,893,611 | +$2,544,345 | +40.07% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 64,550 | $6,008,314 | $8,416,029 | +$2,407,715 | +40.07% | |
| Swiss National Bank | 0.00% | 61,200 | $5,696,496 | $7,979,256 | +$2,282,760 | +40.07% | |
| Wells Fargo & Company/Mn | 0.00% | 51,701 | $4,812,318 | $6,740,776 | +$1,928,458 | +40.07% |
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.