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. 99.3% of the shares are freely tradable; institutional investors hold 110.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 15.99 | 4,936,774 | +2.3 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 8.06 | 2,488,293 | +0.0 | 03/31/2026 |
| FMR Inc | 7.87 | 2,431,121 | +298.2 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.48 | 1,382,770 | +0.0 | 03/31/2026 |
| Balyasny Asset Management LLC | 4.42 | 1,364,540 | +460.4 | 03/31/2026 |
| State Street Corp | 3.85 | 1,189,045 | +0.2 | 03/31/2026 |
| Victory Capital Management Inc. | 3.67 | 1,134,007 | -11.3 | 06/30/2026 |
| BNP Paribas Investment Partners SA | 3.26 | 1,006,028 | -7.8 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 6.07 | 1,873,439 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.17 | 980,466 | +0.3 | 07/31/2026 |
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 | 3,641,754 $ | Sep 15, 2026 | direct |
| Tatnall Christopher | EVP Global Customer Operations | 27,491 | 2,875,559 $ | Sep 15, 2026 | direct |
| Ryzhik David | SVP Interim CFO | 9,790 | 1,024,034 $ | 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: September 17, 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.