AXCELIS TECHNOLOGIES INC (ACLS)
Institutional ownership reported to the SEC as of Q3 2026, across 32 quarters.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| REINHART PARTNERS, LLC. | $139.1M | 1,060,636 | 3.38% | 11q | +14.2%+$17.3M |
| Central Pacific Bank - Trust Division | $730.3K | 5,567 | 0.08% | 2q | +47.9%+$236.4K |
| GAMMA Investing LLC | $400.2K | 3,051 | 0.01% | 12q | +5.7%+$21.5K |
| Versant Capital Management, Inc | $135.2K | 1,031 | 0.01% | 28q | +1.0%+$1.3K |
| Farther Finance Advisors, LLC | $127.9K | 975 | 0.00% | 16q | -7.5%-$10.4K |
| MassMutual Private Wealth & Trust, FSB | $78.4K | 598 | 0.00% | 17q | +25.9%+$16.1K |
| Bullock Wealth Management Group | $46.8K | 342 | 0.02% | 11q | HELD |
| Paladin Partners, LLC | $13.1K | 100 | 0.01% | 2q | HELD |
| CoreCap Advisors, LLC | $6.8K | 52 | 0.00% | 9q | -13.3%-$1.0K |
| TOTH FINANCIAL ADVISORY CORP | $1.2K | 9 | 0.00% | new | NEW |
| Retirement Wealth Solutions LLC | $919 | 7 | 0.00% | 5q | -58.8%-$1.3K |
| GILPIN WEALTH MANAGEMENT, LLC | $525 | 4 | 0.00% | 4q | +33.3% |
| Davis Capital Management | $394 | 3 | 0.00% | 2q | +50.0% |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-06 | 13G/A | FMR LLCwith 1 co-filers | 13.4% |
| 2026-07-14 | 13G/A | REINHART PARTNERS, LLC. | 3.0% |
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-06 | Low Russell | PRESIDENT AND CEO | Sold | 7,468 | $1.2M |
| 2026-05-19 | KURTZWEIL JOHN T | Director | Sold | 3,500 | $485.8K |
| 2026-05-13 | Redinbo Greg | EVP MARKETING AND APPLICATIONS | Sold | 2,883 | $463.7K |
| 2026-05-19 | GRAVES GREGORY B | Director | Sold | 3,225 | $456.7K ×2 |
| 2026-05-14 | Sutton Todd | VP Corporate Controller | Sold | 2,574 | $421.9K |
| 2026-05-12 | Mahoney Robert John | EVP Global Operations | Sold | 2,258 | $363.5K |
| 2026-05-13 | Titinger Jorge | Director | Sold | 2,000 | $328.3K |
| 2026-05-27 | Sutton Todd | VP Corporate Controller | Sold | 2,000 | $320.0K |
| 2026-05-19 | Quirk Jeanne | Director | Sold | 1,789 | $250.9K |
| 2026-06-03 | Sayiner Necip | Director | Sold | 1,586 | $249.7K |
| 2026-06-02 | Mahoney Robert John | EVP Global Operations | Sold | 1,155 | $179.3K |
| 2026-05-21 | Blumenstock Gerald M | EVP, Research, Dev. & Eng. | Sold | 1,161 | $177.3K |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 13 | $140.7M | 1,072,375 | 1 | 7 | 3 | 0.0% |
| Q2 2026 | 447 | $6.5B | 33,277,156 | 111 | 113 | 139 | 3.0% |
| Q1 2026 | 380 | $3.1B | 32,689,499 | 64 | 95 | 129 | 1.0% |
| Q4 2025 | 373 | $2.5B | 31,358,969 | 53 | 120 | 116 | 0.7% |
| Q3 2025 | 363 | $3.1B | 30,627,928 | 73 | 102 | 116 | 2.3% |
| Q2 2025 | 334 | $2.3B | 31,807,062 | 65 | 101 | 105 | 3.0% |
| Q1 2025 | 308 | $1.6B | 31,184,167 | 45 | 120 | 89 | 3.4% |
| Q4 2024 | 328 | $2.3B | 30,936,325 | 42 | 118 | 92 | 3.9% |
| Q3 2024 | 372 | $3.3B | 30,426,695 | 51 | 126 | 122 | 2.5% |
| Q2 2024 | 393 | $4.5B | 30,870,793 | 59 | 141 | 124 | 2.7% |
| Q1 2024 | 388 | $3.7B | 32,034,244 | 56 | 116 | 161 | 3.3% |
| Q4 2023 | 423 | $4.1B | 30,497,148 | 56 | 162 | 124 | 4.0% |
| Q3 2023 | 425 | $5.0B | 29,782,149 | 57 | 141 | 147 | 3.2% |
| Q2 2023 | 412 | $5.6B | 29,542,994 | 76 | 109 | 159 | 2.5% |
| Q1 2023 | 386 | $4.1B | 30,063,238 | 88 | 106 | 137 | 1.7% |
| Q4 2022 | 329 | $2.3B | 29,152,633 | 68 | 80 | 114 | 1.0% |
| Q3 2022 | 288 | $1.8B | 28,467,069 | 47 | 90 | 96 | 2.2% |
| Q2 2022 | 276 | $1.6B | 27,743,849 | 38 | 89 | 94 | 2.0% |
| Q1 2022 | 286 | $2.1B | 27,140,431 | 67 | 85 | 95 | 2.2% |
| Q4 2021 | 251 | $2.1B | 27,652,246 | 56 | 67 | 75 | 1.3% |
| Q3 2021 | 204 | $1.4B | 29,085,276 | 39 | 47 | 79 | 0.7% |
| Q2 2021 | 186 | $1.2B | 28,919,528 | 19 | 53 | 76 | 0.5% |
| Q1 2021 | 192 | $1.2B | 29,166,584 | 45 | 48 | 65 | 0.8% |
| Q4 2020 | 171 | $838.2M | 28,637,260 | 21 | 52 | 62 | 0.5% |
| Q3 2020 | 176 | $626.8M | 28,276,396 | 34 | 52 | 51 | 0.7% |
| Q2 2020 | 175 | $792.0M | 28,290,061 | 44 | 51 | 46 | 0.5% |
| Q1 2020 | 137 | $528.7M | 28,794,885 | 20 | 41 | 39 | 0.3% |
| Q4 2019 | 136 | $690.0M | 28,581,859 | 20 | 42 | 39 | 0.2% |
| Q3 2019 | 142 | $457.9M | 26,628,937 | 24 | 42 | 42 | 0.6% |
| Q2 2019 | 133 | $407.4M | 26,914,007 | 14 | 54 | 30 | 0.6% |
| Q1 2019 | 147 | $548.3M | 27,114,203 | 24 | 44 | 31 | 0.5% |
| Q4 2018 | 138 | $499.8M | 28,048,990 | 4 | 2 | 1 | 0.1% |