Axcelis Technologies
ACLS · NASDAQ
$112.93+$1.72 (+1.55%)TodayMarket closed ·
Prev close $111.21
Who owns ACLS
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 56.5% of ACLS’s shares.
- BlackRock Institutional Trust Company, N.A.14.5%
- Fidelity Management & Research Company LLC11.0%
- Vanguard Portfolio Management, LLC8.1%
- Vanguard Capital Management, LLC4.5%
- Next 6 largest institutions18.4%
- All other shareholders43.5%
| Holder | Shares | % of shares |
|---|---|---|
| BlackRock Institutional Trust Company, N.A. | 4.46M | 14.51% |
| Fidelity Management & Research Company LLC | 3.39M | 11.04% |
| Vanguard Portfolio Management, LLC | 2.48M | 8.07% |
| Vanguard Capital Management, LLC | 1.39M | 4.51% |
| State Street Investment Management (US) | 1.23M | 4.01% |
| Victory Capital Management Inc. | 1.13M | 3.69% |
| Reinhart Partners, LLC | 928.66K | 3.02% |
| Geode Capital Management, L.L.C. | 833.61K | 2.71% |
| BNP Paribas Asset Management USA, Inc. | 802.67K | 2.61% |
| Dimensional Fund Advisors, L.P. | 709.27K | 2.31% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| iShares Core S&P Small-Cap ETF | 1.87M | 6.09% |
| Vanguard Total Stock Market Index Fund | 980.47K | 3.19% |
| Amundi Funds Global Equity | 883.40K | 2.87% |
| iShares Russell 2000 ETF | 811.23K | 2.64% |
| Vanguard Information Technology Index Fund | 745.03K | 2.42% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $5.66M (18 trades) of ACLS on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Tatnall Christopher | Tax withholding | 136 | $14.29K |
| Redinbo Greg | Tax withholding | 208 | $21.85K |
| Ryzhik David | Tax withholding | 94 | $13.63K |
| Ryzhik David | Tax withholding | 127 | $18.42K |
| Ryzhik David | Tax withholding | 76 | $13.44K |
| Blumenstock Gerald M | Tax withholding | 506 | $96.95K |
| Sayiner Necip | Sale | 1.59K | $249.70K |
| Mahoney Robert John | Sale | 1.16K | $179.30K |
| Sutton Todd | Sale | 2.00K | $319.98K |
| St Dennis Thomas | Sale | 900 | $139.83K |
Short interest
Settled Sep 30, 2026
- Shares short
- 1.44M
- Days to cover
- 3.80
- % of shares outstanding
- 4.68%
- Average daily volume
- 378.50K
- Change since last report
- +0.3%
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