United States Semiconductors & Semiconductor Equipment

Axcelis Technologies Inc (ACLS)

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Over the past 90 days, Axcelis Technologies Inc. has seen significant insider selling, with 33 transactions totaling approximately $10.85 million in sales and no recorded buys. Key executives and directors, including Necip Sayiner and Robert Mahoney, have offloaded shares. This activity follows the company's May 2026 earnings report, amid an 8.1% decline in stock price.
Ticker: ACLS Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Buy signal Sell signal Earnings
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Insider trades have triggered activity signals for Axcelis Technologies Inc. Upgrade to see score, net flow, insiders and the full signal context.

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Sale 3 Jun 2026
Value US$1,780,684.25 | Price 213.23 | Shares 8,996 (+3.0%)
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-06-04 2026-06-03 S Sale
2.4
Sayiner Necip
Non-Executive Director
8,996 +3.0%
213.23
US$1,780,684 		8,996 +3.0% 213.23 US$1,780,684
2026-06-03 2026-06-03 PrS Proposed sale
2.4
NECIP SAYINER

Director

Non-Executive Director
55,349
139.70
US$4,770,348 		55,349 139.70 US$4,770,348
2026-06-03 2026-06-02 S Sale
Mahoney Robert John

EVP Global Operations

Officer
99,270 -16.6%
192.89
US$2,295,785 		99,270 -16.6% 192.89 US$2,295,785
2026-06-02 2026-06-02 PrS Proposed sale
ROBERT MAHONEY

Officer

Officer
1,155
155.24
US$179,302 		1,155 155.24 US$179,302
2026-05-28 2026-05-27 S Sale
Sutton Todd

VP Corporate Controller

Officer
2,000 -23.9%
159.99
US$319,980 		2,000 -23.9% 159.99 US$319,980
2026-05-27 2026-05-27 PrS Proposed sale
TODD SUTTON

Officer

Officer
2,000
159.99
US$319,980 		2,000 159.99 US$319,980
2026-05-26 2026-05-22 S Sale
2.7
St Dennis Thomas
Non-Executive Director
900 -4.8%
155.37
US$139,833 		900 -4.8% 155.37 US$139,833
2026-05-22 2026-05-22 S Sale
Evans Eileen

EVP, General Counsel and Sec'y

Officer
926 -2.9%
155.51
US$143,998 		926 -2.9% 155.51 US$143,998
2026-05-22 2026-05-22 PrS Proposed sale
2.7
THOMAS M. ST. DENNIS

Director

Non-Executive Director
900
155.37
US$139,833 		900 155.37 US$139,833
2026-05-22 2026-05-22 PrS Proposed sale
EILEEN EVANS

Officer

Officer
926
155.51
US$143,998 		926 155.51 US$143,998
2026-05-22 2026-05-21 S Sale
1.5
Blumenstock Gerald M

EVP, Research, Dev. & Eng.

Officer
1,161 -5.4%
152.70
US$177,285 		1,161 -5.4% 152.70 US$177,285
2026-05-21 2026-05-21 PrS Proposed sale
1.5
GERALD BLUMENSTOCK

Officer

Officer
1,161
152.70
US$177,285 		1,161 152.70 US$177,285
2026-05-21 2026-05-20 S Sale
Tatnall Christopher

EVP Global Customer Operations

Officer
1,166 -4.0%
149.75
US$174,608 		1,166 -4.0% 149.75 US$174,608
2026-05-20 2026-05-20 PrS Proposed sale
CHRISTOPHER TATNALL

Officer

Officer
1,166
149.75
US$174,608 		1,166 149.75 US$174,608
2026-05-20 2026-05-19 S Sale
3.1
GRAVES GREGORY B
Non-Executive Director
600 -9.9%
142.51
US$85,509 		600 -9.9% 142.51 US$85,509
2026-05-20 2026-05-19 S Sale
3.1
GRAVES GREGORY B
Non-Executive Director
2,625 -30.2%
141.41
US$371,188 		2,625 -30.2% 141.41 US$371,188
2026-05-20 2026-05-19 S Sale
2.3
Quirk Jeanne
Non-Executive Director
1,789 -13.6%
140.22
US$250,854 		1,789 -13.6% 140.22 US$250,854
2026-05-20 2026-05-19 S Sale
2.3
KURTZWEIL JOHN T
Non-Executive Director
3,500 -9.6%
138.79
US$485,771 		3,500 -9.6% 138.79 US$485,771
2026-05-19 2026-05-19 PrS Proposed sale
3.1
GREGORY GRAVES

Director

Non-Executive Director
3,225
141.61
US$456,697 		3,225 141.61 US$456,697
2026-05-19 2026-05-19 PrS Proposed sale
2.3
JEANNE QUIRK

Director

Non-Executive Director
1,789
140.22
US$250,854 		1,789 140.22 US$250,854
2026-05-19 2026-05-19 PrS Proposed sale
2.3
JOHN THOMAS KURTZWEIL

Director

Non-Executive Director
3,500
138.79
US$485,771 		3,500 138.79 US$485,771
2026-05-15 2026-05-14 S Sale
Sutton Todd

VP Corporate Controller

Officer
2,574 -24.8%
163.89
US$421,865 		2,574 -24.8% 163.89 US$421,865
2026-05-15 2026-05-14 S Sale
1.5
Blumenstock Gerald M

EVP, Research, Dev. & Eng.

Officer
1,015 -5.5%
162.32
US$164,750 		1,015 -5.5% 162.32 US$164,750
2026-05-14 2026-05-14 PrS Proposed sale
TODD SUTTON

Officer

Officer
2,574
163.85
US$421,749 		2,574 163.85 US$421,749
2026-05-14 2026-05-14 PrS Proposed sale
1.5
GERALD BLUMENSTOCK

Officer

Officer
1,015
162.32
US$164,750 		1,015 162.32 US$164,750
2026-05-14 2026-05-13 S Sale
3.1
Titinger Jorge
Non-Executive Director
2,000 -30.9%
164.14
US$328,280 		2,000 -30.9% 164.14 US$328,280
2026-05-14 2026-05-13 S Sale
2.0
Redinbo Greg

EVP MARKETING AND APPLICATIONS

Officer
2,883 -8.8%
160.85
US$463,731 		2,883 -8.8% 160.85 US$463,731
2026-05-13 2026-05-13 PrS Proposed sale
3.1
JORGE TITINGER

Director

Non-Executive Director
2,000
164.14
US$328,280 		2,000 164.14 US$328,280
2026-05-13 2026-05-13 PrS Proposed sale
2.0
GREGORY F REDINBO

Officer

Officer
2,883
160.85
US$463,731 		2,883 160.85 US$463,731
2026-05-13 2026-05-12 S Sale
Mahoney Robert John

EVP Global Operations

Officer
2,258 -15.0%
161.00
US$363,538 		2,258 -15.0% 161.00 US$363,538
2026-05-12 2026-05-12 PrS Proposed sale
ROBERT MAHONEY

Officer

Officer
2,258
161.00
US$363,538 		2,258 161.00 US$363,538
2026-05-07 2026-05-06 PlS Planned sale
2.3
Low Russell

PRESIDENT AND CEO

Executive Director
7,468 -5.7%
156.75
US$1,170,609 		7,468 -5.7% 156.75 US$1,170,609
2026-05-06 2026-05-06 PrS Proposed sale
2.3
RUSSELL LOW

Officer

Officer
7,468
139.70
US$1,043,280 		7,468 139.70 US$1,043,280
2026-05-04 2026-05-01 PlS Planned sale
2.3
Low Russell

PRESIDENT AND CEO

Executive Director
1,244 -0.9%
138.86
US$172,742 		1,244 -0.9% 138.86 US$172,742
2026-05-01 2026-05-01 PrS Proposed sale
2.3
RUSSELL LOW

Officer

Officer
1,244
139.11
US$173,053 		1,244 139.11 US$173,053
2026-04-02 2026-04-01 PlS Planned sale
2.3
Low Russell

PRESIDENT AND CEO

Executive Director
1,244 -0.9%
94.06
US$117,011 		1,244 -0.9% 94.06 US$117,011
2026-04-01 2026-04-01 PrS Proposed sale
2.3
RUSSELL LOW

Officer

Officer
1,244
93.08
US$115,792 		1,244 93.08 US$115,792
2026-03-26 2026-03-24 PlS Planned sale
2.3
Low Russell

PRESIDENT AND CEO

Executive Director
1,244 -0.9%
90.00
US$111,960 		1,244 -0.9% 90.00 US$111,960
2026-03-24 2026-03-24 PrS Proposed sale
2.3
RUSSELL LOW

Director; Officer

Executive Director
1,244
85.77
US$106,698 		1,244 85.77 US$106,698
2026-02-23 2026-02-20 S Sale
3.1
Titinger Jorge
Non-Executive Director
1,000 -13.4%
80.00
US$80,000 		1,000 -13.4% 80.00 US$80,000
2026-02-20 2026-02-20 PrS Proposed sale
3.1
JORGE TITINGER

Director

Non-Executive Director
1,000
80.00
US$80,000 		1,000 80.00 US$80,000
2025-12-18 2025-12-17 S Sale
3.1
Titinger Jorge
Non-Executive Director
2,000 -21.1%
86.05
US$172,100 		2,000 -21.1% 86.05 US$172,100
2025-12-17 2025-12-17 PrS Proposed sale
3.1
JORGE TITINGER

Director

Non-Executive Director
2,000
86.05
US$172,100 		2,000 86.05 US$172,100
2025-12-12 2025-12-11 S Sale
1.5
Blumenstock Gerald M

EVP, Research, Dev. & Eng.

Officer
3,034 -14.0%
89.46
US$271,422 		3,034 -14.0% 89.46 US$271,422
2025-12-11 2025-12-11 PrS Proposed sale
1.5
GERALD BLUMENSTOCK

Officer

Officer
3,034
89.46
US$271,415 		3,034 89.46 US$271,415
2025-05-21 2025-05-20 S Sale
2.3
KURTZWEIL JOHN T
Non-Executive Director
1,682 -4.6%
61.93
US$104,166 		1,682 -4.6% 61.93 US$104,166
2025-05-20 2025-05-20 PrS Proposed sale
2.3
JOHN THOMAS KURTZWEIL

Director

Non-Executive Director
1,682
61.93
US$104,159 		1,682 61.93 US$104,159
2024-08-29 2024-08-29 PrS Proposed sale
2.6
DOUGLAS LAWSON

Officer

Officer
7,254
112.07
US$812,928 		7,254 112.07 US$812,928
2024-08-06 2024-08-06 PrS Proposed sale
3.1
JORGE TITINGER

Director

Non-Executive Director
6,086
109.98
US$669,338 		6,086 109.98 US$669,338
2024-08-06 2024-08-06 S Sale
3.1
Titinger Jorge
Non-Executive Director
6,086 -50.8%
109.98
US$669,338 		6,086 -50.8% 109.98 US$669,338
2024-05-30 2024-05-30 PrS Proposed sale
2.6
KEITHLEY JOSEPH P

control person
3,157
113.47
US$358,225 		3,157 113.47 US$358,225
2024-05-20 2024-05-20 PrS Proposed sale
2.3
JOHN THOMAS KURTZWEIL

Director

Non-Executive Director
1,200
114.42
US$137,308 		1,200 114.42 US$137,308
2024-05-20 2024-05-20 S Sale
2.3
KURTZWEIL JOHN T
Non-Executive Director
1,200 -3.5%
114.42
US$137,304 		1,200 -3.5% 114.42 US$137,304
2024-05-20 2024-05-20 S Sale
2.3
KURTZWEIL JOHN T
Non-Executive Director
1,200 -3.5%
114.42
US$137,304 		1,200 -3.5% 114.42 US$137,304
2024-03-11 2024-03-11 B Purchase
2.3
Low Russell

PRESIDENT AND CEO

Executive Director
440 +0.8%
112.39
US$49,452 		440 +0.8% 112.39 US$49,452
2024-03-07 2024-03-07 PrS Proposed sale
2.7
KEVIN J BREWER

Officer

Officer
2,866
118.97
US$340,978 		2,866 118.97 US$340,978
2024-03-01 2024-03-01 PrS Proposed sale
2.7
KEVIN J BREWER

Officer

Officer
2,313
117.10
US$270,857 		2,313 117.10 US$270,857
2024-02-29 2024-02-29 B Purchase
2.7
COOGAN JAMES GORDON

EVP AND CFO

Officer
100 +1.7%
112.23
US$11,223 		100 +1.7% 112.23 US$11,223
2024-02-26 2024-02-23 B Purchase
2.6
Lawson Douglas A.

EVP, CORPORATE MKTG & STRATEGY

Officer
500 +2.6%
111.04
US$55,520 		500 +2.6% 111.04 US$55,520
2024-02-23 2024-02-23 PrS Proposed sale
2.7
KEVIN J BREWER

Officer

Officer
4,510
111.12
US$501,150 		4,510 111.12 US$501,150
2023-12-14 2023-12-14 S Sale
2.6
KEITHLEY JOSEPH P
Non-Executive Director
500 -13.7%
140.50
US$70,250 		500 -13.7% 140.50 US$70,250
2023-11-13 2023-11-10 S Sale
2.6
KEITHLEY JOSEPH P
Non-Executive Director
500 -10.7%
130.43
US$65,215 		500 -10.7% 130.43 US$65,215
2023-11-06 2023-11-06 PrS Proposed sale
2.6
KEITHLEY JOSEPH P

control person
2,875
129.54
US$372,428 		2,875 129.54 US$372,428
2023-09-14 2023-09-14 PrS Proposed sale
2.0
GREGORY F REDINBO

Officer

Officer
600
180.18
US$108,105 		600 180.18 US$108,105
2023-09-14 2023-09-14 S Sale
2.0
Redinbo Greg

EVP Marketing and Applications

Officer
600 -3.4%
180.18
US$108,108 		600 -3.4% 180.18 US$108,108
2023-09-07 2023-09-07 PrS Proposed sale
3.1
LYNNETTE FALLON

Officer

Officer
3,098
181.32
US$561,738 		3,098 181.32 US$561,738
2023-09-07 2023-09-07 PrS Proposed sale
3.1
JORGE TITINGER

Director

Non-Executive Director
6,881
177.38
US$1,220,535 		6,881 177.38 US$1,220,535
2023-09-07 2023-09-07 PrS Proposed sale
2.3
RUSSELL LOW

Officer

Officer
3,405
179.25
US$610,349 		3,405 179.25 US$610,349
2023-09-07 2023-09-07 S Sale
3.1
FALLON LYNNETTE C

Executive VP, HR/Legal

Officer
3,098 -9.0%
181.32
US$561,729 		3,098 -9.0% 181.32 US$561,729
2023-09-07 2023-09-07 S Sale
2.3
Low Russell

President and CEO

Executive Director
3,405 -5.6%
179.25
US$610,346 		3,405 -5.6% 179.25 US$610,346
2023-09-07 2023-09-07 S Sale
3.1
Titinger Jorge
Non-Executive Director
6,881 -40.0%
177.38
US$1,220,552 		6,881 -40.0% 177.38 US$1,220,552
2023-08-07 2023-08-07 PrS Proposed sale
2.6
KEITHLEY JOSEPH P

Control Person
2,875
175.74
US$505,252 		2,875 175.74 US$505,252
2023-08-07 2023-08-07 PrS Proposed sale
2.6
DOUGLAS LAWSON

Officer

Officer
375
177.45
US$66,544 		375 177.45 US$66,544
2023-08-07 2023-08-07 S Sale
2.6
Lawson Douglas A.

EVP, Corporate Mktg & Strategy

Officer
375 -2.0%
177.45
US$66,544 		375 -2.0% 177.45 US$66,544
2023-06-14 2023-06-12 S Sale
2.6
KEITHLEY JOSEPH P
Non-Executive Director
500 -10.7%
181.75
US$90,875 		500 -10.7% 181.75 US$90,875
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