Axcelis Technologies Inc
Ownership
Ownership Structure
Who owns Axcelis Technologies Inc (ACLS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.4% of the shares are freely tradable; institutional investors hold 110.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 16.29 | 5,029,462 | +1.9 | 06/30/2026 |
| FMR Inc | 13.36 | 4,125,902 | +69.7 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 8.03 | 2,478,878 | -0.4 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.49 | 1,386,518 | +0.3 | 06/30/2026 |
| State Street Corp | 3.99 | 1,231,109 | +3.5 | 06/30/2026 |
| Victory Capital Management Inc. | 3.67 | 1,134,007 | -11.3 | 06/30/2026 |
| Reinhart Mahoney Capital Management Inc | 3.43 | 1,060,636 | +14.2 | 09/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 5.95 | 1,838,932 | +0.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.18 | 982,468 | +0.3 | 09/30/2026 |
| Amundi Fds Global Equity A EUR C | 3.09 | 954,591 | +4.1 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Redinbo Greg | EVP and Chief Strategy Officer | 34,816 | 3,314,483 $ | Sep 15, 2026 | direct |
| Tatnall Christopher | EVP Global Customer Operations | 27,491 | 2,617,143 $ | Sep 15, 2026 | direct |
| Ryzhik David | SVP Interim CFO | 9,790 | 932,008 $ | Jul 15, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 15, 2026 | Tatnall Christopher | EVP Global Customer Operations | Other | 136 | 105.04 | 14,285 |
| Sep 15, 2026 | Redinbo Greg | EVP and Chief Strategy Officer | Other | 208 | 105.04 | 21,848 |
| Jul 15, 2026 | Ryzhik David | SVP Interim CFO | Other | 94 | 145.01 | 13,631 |
| Jul 15, 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: November 2, 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.