Axcelis Technologies Inc (ACLS)
Who owns Axcelis Technologies Inc (ACLS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.3% of the shares are freely tradable; institutional investors hold 110.0%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 16.06 | 4,936,774 | +2.3 | 03/31/2026 |
| Vanguard Group Inc | 13.41 | 4,122,529 | -1.5 | 12/31/2025 |
| Vanguard Portfolio Management, LLC | 8.10 | 2,488,293 | +0.0 | 03/31/2026 |
| FMR Inc | 7.91 | 2,431,121 | +298.2 | 03/31/2026 |
| Reinhart Mahoney Capital Management Inc | 5.39 | 1,657,745 | +4.3 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.50 | 1,382,770 | +0.0 | 03/31/2026 |
| Balyasny Asset Management LLC | 4.44 | 1,364,540 | +460.4 | 03/31/2026 |
| Victory Capital Management Inc. | 4.16 | 1,279,005 | -29.2 | 03/31/2026 |
| State Street Corp | 3.87 | 1,189,045 | +0.2 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 6.06 | 1,862,464 | +0.0 | 05/29/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 15. Jul 2026 | Ryzhik David | SVP Interim CFO | Other | 94 | 145.01 | 13,631 |
| 15. Jul 2026 | Ryzhik David | SVP Interim CFO | Other | 127 | 145.01 | 18,416 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.