Comparable stake leader
BlackRock, Inc.
SEC ownership of AXCELIS TECHNOLOGIES INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001113232.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
16 Jun 2026
- Public ticker
- ACLS on Nasdaq
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
16 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001113232
- Issuer location
- Beverly, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of AXCELIS TECHNOLOGIES INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
50/50
Latest evidence
16 Jun 2026
13F
13D/G
3/4/5
Lead comparable stake: 15%
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 15%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 5
BlackRock, Inc.
15%
FMR LLC
11%
VANGUARD PORTFOLIO MANAGEMENT LLC
8.1%
VANGUARD CAPITAL MANAGEMENT LLC
5.3%
REINHART PARTNERS, LLC.
5.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13F
13D/G
Company
|
15%
from 13D/G
|
$459,514,886
4,936,774 shares
|
— | 31 Mar 2026 |
| FMR LLC |
13D/G
13F
Company
|
11%
|
$385,292,777
3,479,256 shares
|
+$116,070,470 | 30 Apr 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
8.1%
|
$232,826,496
2,501,359 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
5.3%
|
$150,540,239
1,617,321 shares
|
$0 | 31 Mar 2026 |
| REINHART PARTNERS, LLC. |
13F
13D/G
Company
|
5.2%
from 13D/G
|
$154,304,296
1,657,745 shares
|
— | 31 Mar 2026 |
| AMERICAN CENTURY INVESTMENT MANAGEMENT INC |
13D/G
|
4.3%
|
$131,400,104
1,345,761 shares
|
-$30,629,863 | 30 Sep 2025 |
| Russell Low |
3/4/5
PRESIDENT AND CEO, Director
|
0.5%
|
$14,418,092
154,900 shares
|
-$1,572,321 | 18 May 2026 |
| James G. Coogan |
3/4/5
EVP AND CFO
|
0.12%
|
$3,215,927
37,144 shares
|
— | 02 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$6,416,037.
Buys
$0
Insiders: 0
Sells
$6,416,037
Insiders: 13
Net
-$6,416,037
Shares: -45,372
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 45,372
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 39,338 | $0 | $5,892,516 | -$5,892,516 |
| 3-6 | 0 | 1,000 | $0 | $80,000 | -$80,000 |
| 6-9 | 0 | 5,034 | $0 | $443,522 | -$443,522 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 25 reporting-owner rows connected to AXCELIS TECHNOLOGIES INC. Open a relationship link for the CIK-to-CIK filing trail.
Rows
25
Largest Forms 3/4/5 holder
Mary G. Puma
Net 12M change
-$6,416,038
Latest report
16 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Mary G. Puma | EXECUTIVE CHAIRPERSON, Director | $26,787,767 | Mixed | 09 May 2024 | ||
| Russell Low | PRESIDENT AND CEO, Director | $14,418,092 | -$1,572,321 | -9.8% | Median | 18 May 2026 |
| Arthur L. George Jr. | Director | $8,280,508 | Mixed | 17 May 2021 | ||
| Eileen J. Evans | EVP, General Counsel and Sec'y | $4,866,538 | -$143,998 | -2.9% | Filing P/S | 22 May 2026 |
| Richard J. Faubert | Director | $4,724,313 | Mixed | 12 Aug 2022 | ||
| Kurtzweil John T. | Director | $4,578,738 | -$485,771 | -9.6% | Filing P/S | 19 May 2026 |
| William J. Bintz | EVP, Product Development | $4,379,807 | Mixed | 23 Nov 2022 | ||
| Christopher Tatnall | EVP Global Customer Operations | $4,137,143 | -$174,609 | -4% | Filing P/S | 20 May 2026 |
| Greg Redinbo | Evp Marketing And Applications | $3,260,033 | -$463,731 | -12% | Median | 18 May 2026 |
| James G. Coogan | Evp And Cfo | $3,215,927 | Mixed | 02 Mar 2026 | ||
| Kevin J. Brewer | EVP & Chief Financial Officer | $2,753,379 | Mixed | 06 Dec 2023 | ||
| Thomas St Dennis | Director | $2,749,272 | -$139,833 | -4.8% | Filing P/S | 22 May 2026 |
| Robert John Mahoney | EVP Global Operations | $2,237,008 | -$542,840 | -20% | Filing P/S | 02 Jun 2026 |
| Douglas A. Lawson | Evp, Corporate Mktg & Strategy | $2,150,204 | Mixed | 20 Jun 2024 | ||
| Lynnette C. Fallon | Executive Vp, Hr/Legal | $1,966,163 | Mixed | 03 Jan 2025 | ||
| Gerald M. Blumenstock | EVP, Research, Dev. & Eng. | $1,860,389 | -$613,456 | -25% | Median | 15 Jun 2026 |
| Jeanne Quirk | Director | $1,598,508 | -$250,854 | -14% | Filing P/S | 19 May 2026 |
| Necip Sayiner | Director | $1,119,728 | -$249,703 | -18% | Filing P/S | 03 Jun 2026 |
| Tzu Yin Chiu | Director | $1,102,346 | Median | 15 May 2026 | ||
| Dipti Vachani | Director | $1,024,482 | Mixed | 15 May 2024 |
Recent insider transactions for AXCELIS TECHNOLOGIES INC
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| David Ryzhik | ACLS | Common Stock | Tax liability | -0.76% | -76 | 9,955 | 16 Jun 2026 | Direct | ||
| Gerald M. Blumenstock | ACLS | Common Stock | Tax liability | -2.47% | -506 | 19,987 | 15 Jun 2026 | Direct | ||
| Necip Sayiner | ACLS | Common Stock | Sale | -18.2% | $249,703 | $157.44 | -1,586 | 7,112 | 03 Jun 2026 | Direct |
| Robert John Mahoney | ACLS | Common Stock | Sale | -7.42% | $179,302 | $155.24 | -1,155 | 14,410 | 02 Jun 2026 | Direct |
| Todd Sutton | ACLS | Common Stock | Sale | -23.9% | $319,980 | $159.99 | -2,000 | 6,360 | 27 May 2026 | Direct |
| Thomas St Dennis | ACLS | Common Stock | Sale | -4.84% | $139,833 | $155.37 | -900 | 17,695 | 22 May 2026 | Direct |
| Eileen J. Evans | ACLS | Common Stock | Sale | -2.87% | $143,998 | $155.51 | -926 | 31,295 | 22 May 2026 | Direct |
| Gerald M. Blumenstock | ACLS | Common Stock | Sale | -5.36% | $177,285 | $152.70 | -1,161 | 20,493 | 21 May 2026 | Direct |
| Christopher Tatnall | ACLS | Common Stock | Sale | -4.05% | $174,608 | $149.75 | -1,166 | 27,627 | 20 May 2026 | Direct |
| Gregory B. Graves | ACLS | Common Stock | Sale | -37.1% | $456,697 | $141.61 | -3,225 | 5,473 | 19 May 2026 | Direct |
| Kurtzweil John T. | ACLS | Common Stock | Sale | -9.59% | $485,771 | $138.79 | -3,500 | 32,990 | 19 May 2026 | Direct |
| Jeanne Quirk | ACLS | Common Stock | Sale | -13.6% | $250,854 | $140.22 | -1,789 | 11,400 | 19 May 2026 | Direct |
| Todd Sutton | ACLS | Common Stock | Tax liability | -2.15% | -184 | 8,360 | 18 May 2026 | Direct | ||
| Robert John Mahoney | ACLS | Common Stock | Tax liability | -1.97% | -312 | 15,565 | 18 May 2026 | Direct | ||
| Greg Redinbo | ACLS | Common Stock | Tax liability | -0.54% | -190 | 35,024 | 18 May 2026 | Direct | ||
| Russell Low | ACLS | Common Stock | Tax liability | -0.46% | -711 | 154,900 | 18 May 2026 | Direct | ||
| Todd Sutton | ACLS | Common Stock | Tax liability | -4.91% | -441 | 8,544 | 15 May 2026 | Direct | ||
| Todd Sutton | ACLS | Common Stock | Award | 14.9% | 1,168 | 8,985 | 15 May 2026 | Direct | ||
| David Ryzhik | ACLS | Common Stock | Tax liability | -2.2% | -226 | 10,031 | 15 May 2026 | Direct | ||
| David Ryzhik | ACLS | Common Stock | Award | 43.6% | 3,115 | 10,257 | 15 May 2026 | Direct | ||
| Robert John Mahoney | ACLS | Common Stock | Tax liability | -4.66% | -776 | 15,877 | 15 May 2026 | Direct | ||
| Robert John Mahoney | ACLS | Common Stock | Award | 30.5% | 3,894 | 16,653 | 15 May 2026 | Direct | ||
| Gerald M. Blumenstock | ACLS | Common Stock | Tax liability | -4.79% | -1,089 | 21,654 | 15 May 2026 | Direct | ||
| Gerald M. Blumenstock | ACLS | Common Stock | Award | 31.5% | 5,450 | 22,743 | 15 May 2026 | Direct | ||
| Christopher Tatnall | ACLS | Common Stock | Tax liability | -4.19% | -1,259 | 28,793 | 15 May 2026 | Direct | ||
| Christopher Tatnall | ACLS | Common Stock | Award | 30.4% | 7,008 | 30,052 | 15 May 2026 | Direct | ||
| Greg Redinbo | ACLS | Common Stock | Tax liability | -2.33% | -839 | 35,214 | 15 May 2026 | Direct | ||
| Greg Redinbo | ACLS | Common Stock | Award | 20.9% | 6,230 | 36,053 | 15 May 2026 | Direct | ||
| Eileen J. Evans | ACLS | Common Stock | Tax liability | -2.62% | -867 | 32,221 | 15 May 2026 | Direct | ||
| Eileen J. Evans | ACLS | Common Stock | Award | 30.8% | 7,786 | 33,088 | 15 May 2026 | Direct | ||
| Russell Low | ACLS | Common Stock | Tax liability | -4.24% | -6,891 | 155,611 | 15 May 2026 | Direct | ||
| Russell Low | ACLS | Common Stock | Award | 31.5% | 38,932 | 162,502 | 15 May 2026 | Direct | ||
| Jorge Titinger | ACLS | Common Stock | Award | 32.2% | 1,440 | 5,917 | 15 May 2026 | Direct | ||
| Thomas St Dennis | ACLS | Common Stock | Award | 8.39% | 1,440 | 18,595 | 15 May 2026 | Direct | ||
| Necip Sayiner | ACLS | Common Stock | Award | 19.8% | 1,440 | 8,698 | 15 May 2026 | Direct | ||
| Jeanne Quirk | ACLS | Common Stock | Award | 12.3% | 1,440 | 13,189 | 15 May 2026 | Direct | ||
| Kurtzweil John T. | ACLS | Common Stock | Award | 4.11% | 1,440 | 36,490 | 15 May 2026 | Direct | ||
| Gregory B. Graves | ACLS | Common Stock | Award | 19.8% | 1,440 | 8,698 | 15 May 2026 | Direct | ||
| Tzu Yin Chiu | ACLS | Common Stock | Award | 13.8% | 1,440 | 11,843 | 15 May 2026 | Direct | ||
| Todd Sutton | ACLS | Common Stock | Sale | -24.8% | $421,865 | $163.89 | -2,574 | 7,817 | 14 May 2026 | Direct |
| Gerald M. Blumenstock | ACLS | Common Stock | Sale | -5.54% | $164,750 | $162.32 | -1,015 | 17,293 | 14 May 2026 | Direct |
| Jorge Titinger | ACLS | Common Stock | Sale | -30.9% | $328,280 | $164.14 | -2,000 | 4,477 | 13 May 2026 | Direct |
| Greg Redinbo | ACLS | Common Stock | Sale | -8.81% | $463,731 | $160.85 | -2,883 | 29,823 | 13 May 2026 | Direct |
| Robert John Mahoney | ACLS | Common Stock | Sale | -15% | $363,538 | $161.00 | -2,258 | 12,759 | 12 May 2026 | Direct |
| Russell Low | ACLS | Common Stock | Sale | -5.7% | $1,170,609 | $156.75 | -7,468 | 123,570 | 06 May 2026 | Direct |
| Russell Low | ACLS | Common Stock | Sale | -0.94% | $172,742 | $138.86 | -1,244 | 131,038 | 01 May 2026 | Direct |
| Christopher Tatnall | ACLS | Common Stock | Tax liability | -3.79% | -907 | 23,044 | 20 Apr 2026 | Direct | ||
| Russell Low | ACLS | Common Stock | Sale | -0.93% | $117,011 | $94.06 | -1,244 | 132,282 | 01 Apr 2026 | Direct |
| Russell Low | ACLS | Common Stock | Sale | -0.92% | $111,960 | $90.00 | -1,244 | 133,526 | 24 Mar 2026 | Direct |
| Robert John Mahoney | ACLS | Common Stock | Tax liability | -3.77% | -573 | 14,633 | 02 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.