Blumenstock Gerald M
- Shares
- 19.99K
- % company
- 0.07%
- Price
- $191.60
- Value
- $3,829,509
Filed Jun 15, 2026
Methodology published · Market data, model notes, and corrections process are public · Data policy · Corrections policy
NASDAQ · TECHNOLOGY · Holders
Axcelis Technologies Inc (ACLS) Institutional Ownership & Insider Trading History
Recent insider purchases and sales for ACLS from Form 4 filings. Institutional holdings surface here when ownership sources publish.
Section freshness
Price Jun 26, 4:00 PM EDT · Statements Mar 30, 8:00 PM EDT
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Data freshness
Prices update fastest. Fundamentals, analyst data, and news update on their own schedules, so check these timestamps before comparing signals.
Price time means the latest available trade or regular-market close. Other times show when that section was checked or published.
PriceLive
Last traded •
Source: Market data provider
Fundamentalsevery 1 day
Provider checked •
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Analystevery 1 day
Provider checked •
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Newsevery 4 hr
Latest item •
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Ownership read
ACLS insider sentiment: Net selling.
23 sales and 0 purchases appear in the recent Form 4 filings. Use the filters below to separate real buying and selling from option exercises, gifts, awards, and tax withholding.
Insider flow
ACLS
Purchases—
Sales806.13K
Directional bars ignore awards, gifts, conversions, and tax withholding rows.
Top holder
—
Institutional data pending
Insider stance
Net selling
$103.60M sold / — bought
Latest filing
Jun 15, 2026
Most recent holder or insider filing date
Filings shown
83
0 holder / 83 insider
- Holder rows
- Pending
- Market data source
- Latest filing
- Jun 15, 2026
- Most recent holder or insider filing date
- Increased / initiated
- Pending
- 0 decreased
- Insider rows
- 83
- Market data source
Recent insider transactions
Axcelis Technologies Inc (ACLS) Form 4 filings
Action codes are translated so open-market buys and sales are separate from awards, gifts, conversions, and tax withholding.
Sayiner Necip
- Shares
- 7.11K
- % company
- 0.02%
- Price
- $157.44
- Value
- $1,119,729
Filed Jun 3, 2026
Mahoney Robert John
- Shares
- 14.41K
- % company
- 0.05%
- Price
- $155.24
- Value
- $2,237,008
Filed Jun 2, 2026
Sutton Todd
- Shares
- 6.36K
- % company
- 0.02%
- Price
- $159.99
- Value
- $1,017,536
Filed May 27, 2026
St Dennis Thomas
- Shares
- 17.70K
- % company
- 0.06%
- Price
- $155.37
- Value
- $2,749,272
Filed May 22, 2026
Evans Eileen
- Shares
- 31.30K
- % company
- 0.10%
- Price
- $155.51
- Value
- $4,866,538
Filed May 22, 2026
Blumenstock Gerald M
- Shares
- 20.49K
- % company
- 0.07%
- Price
- $152.70
- Value
- $3,129,281
Filed May 21, 2026
Tatnall Christopher
- Shares
- 27.63K
- % company
- 0.09%
- Price
- $149.75
- Value
- $4,137,143
Filed May 20, 2026
Quirk Jeanne
- Shares
- 11.40K
- % company
- 0.04%
- Price
- $140.22
- Value
- $1,598,508
Filed May 19, 2026
GRAVES GREGORY B
- Shares
- 5.47K
- % company
- 0.02%
- Price
- $142.51
- Value
- $779,982
Filed May 19, 2026
GRAVES GREGORY B
- Shares
- 6.07K
- % company
- 0.02%
- Price
- $141.41
- Value
- $858,753
Filed May 19, 2026
KURTZWEIL JOHN T
- Shares
- 32.99K
- % company
- 0.11%
- Price
- $138.79
- Value
- $4,578,738
Filed May 19, 2026
Sutton Todd
- Shares
- 8.36K
- % company
- 0.03%
- Price
- $146.24
- Value
- $1,222,566
Filed May 18, 2026
Mahoney Robert John
- Shares
- 15.56K
- % company
- 0.05%
- Price
- $146.24
- Value
- $2,276,226
Filed May 18, 2026
Mahoney Robert John
- Shares
- 15.70K
- % company
- 0.05%
- Price
- $146.24
- Value
- $2,295,237
Filed May 18, 2026
Redinbo Greg
- Shares
- 35.02K
- % company
- 0.11%
- Price
- $146.24
- Value
- $5,121,910
Filed May 18, 2026
Redinbo Greg
- Shares
- 35.10K
- % company
- 0.11%
- Price
- $146.24
- Value
- $5,133,463
Filed May 18, 2026
Low Russell
- Shares
- 154.90K
- % company
- 0.50%
- Price
- $146.24
- Value
- $22,652,576
Filed May 18, 2026
Sutton Todd
- Shares
- 8.54K
- % company
- 0.03%
- Price
- $155.18
- Value
- $1,325,858
Filed May 15, 2026
Sutton Todd
- Shares
- 8.65K
- % company
- 0.03%
- Price
- $155.18
- Value
- $1,341,841
Filed May 15, 2026
Sutton Todd
- Shares
- 8.76K
- % company
- 0.03%
- Price
- $155.18
- Value
- $1,359,222
Filed May 15, 2026
Sutton Todd
- Shares
- 8.98K
- % company
- 0.03%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Ryzhik David
- Shares
- 10.03K
- % company
- 0.03%
- Price
- $155.18
- Value
- $1,556,611
Filed May 15, 2026
Ryzhik David
- Shares
- 10.26K
- % company
- 0.03%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Mahoney Robert John
- Shares
- 15.88K
- % company
- 0.05%
- Price
- $155.18
- Value
- $2,463,793
Filed May 15, 2026
Mahoney Robert John
- Shares
- 15.94K
- % company
- 0.05%
- Price
- $155.18
- Value
- $2,473,259
Filed May 15, 2026
Mahoney Robert John
- Shares
- 16.11K
- % company
- 0.05%
- Price
- $155.18
- Value
- $2,499,639
Filed May 15, 2026
Mahoney Robert John
- Shares
- 16.28K
- % company
- 0.05%
- Price
- $155.18
- Value
- $2,526,486
Filed May 15, 2026
Mahoney Robert John
- Shares
- 16.65K
- % company
- 0.05%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Mahoney Robert John
- Shares
- 14.71K
- % company
- 0.05%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Tatnall Christopher
- Shares
- 28.79K
- % company
- 0.09%
- Price
- $155.18
- Value
- $4,468,098
Filed May 15, 2026
Tatnall Christopher
- Shares
- 28.96K
- % company
- 0.09%
- Price
- $155.18
- Value
- $4,494,478
Filed May 15, 2026
Tatnall Christopher
- Shares
- 29.31K
- % company
- 0.10%
- Price
- $155.18
- Value
- $4,548,015
Filed May 15, 2026
Tatnall Christopher
- Shares
- 30.05K
- % company
- 0.10%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Tatnall Christopher
- Shares
- 26.55K
- % company
- 0.09%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Blumenstock Gerald M
- Shares
- 21.65K
- % company
- 0.07%
- Price
- $155.18
- Value
- $3,360,268
Filed May 15, 2026
Blumenstock Gerald M
- Shares
- 22.00K
- % company
- 0.07%
- Price
- $155.18
- Value
- $3,413,805
Filed May 15, 2026
Blumenstock Gerald M
- Shares
- 22.74K
- % company
- 0.07%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Blumenstock Gerald M
- Shares
- 20.02K
- % company
- 0.07%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Redinbo Greg
- Shares
- 35.21K
- % company
- 0.11%
- Price
- $155.18
- Value
- $5,464,509
Filed May 15, 2026
Redinbo Greg
- Shares
- 35.39K
- % company
- 0.12%
- Price
- $155.18
- Value
- $5,491,975
Filed May 15, 2026
Redinbo Greg
- Shares
- 35.60K
- % company
- 0.12%
- Price
- $155.18
- Value
- $5,524,563
Filed May 15, 2026
Redinbo Greg
- Shares
- 36.05K
- % company
- 0.12%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Redinbo Greg
- Shares
- 32.94K
- % company
- 0.11%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Evans Eileen
- Shares
- 32.22K
- % company
- 0.10%
- Price
- $155.18
- Value
- $5,000,055
Filed May 15, 2026
Evans Eileen
- Shares
- 33.09K
- % company
- 0.11%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Evans Eileen
- Shares
- 29.20K
- % company
- 0.09%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Low Russell
- Shares
- 155.61K
- % company
- 0.51%
- Price
- $155.18
- Value
- $24,147,715
Filed May 15, 2026
Low Russell
- Shares
- 157.06K
- % company
- 0.51%
- Price
- $155.18
- Value
- $24,373,192
Filed May 15, 2026
Low Russell
- Shares
- 158.79K
- % company
- 0.52%
- Price
- $155.18
- Value
- $24,640,411
Filed May 15, 2026
Low Russell
- Shares
- 162.50K
- % company
- 0.53%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
Low Russell
- Shares
- 143.04K
- % company
- 0.47%
- Price
- No cash value
- Value
- No cash value
Filed May 15, 2026
| # | Insider | % company | Action | Shares | Price | Value | Filing date |
|---|---|---|---|---|---|---|---|
| 1 | Blumenstock Gerald M | 0.07% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 19.99K | $191.60 | $3,829,509 | Jun 15, 2026 |
| 2 | Sayiner Necip | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 7.11K | $157.44 | $1,119,729 | Jun 3, 2026 |
| 3 | Mahoney Robert John | 0.05% | SaleOpen-market or direct sale reported on Form 4. | 14.41K | $155.24 | $2,237,008 | Jun 2, 2026 |
| 4 | Sutton Todd | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 6.36K | $159.99 | $1,017,536 | May 27, 2026 |
| 5 | St Dennis Thomas | 0.06% | SaleOpen-market or direct sale reported on Form 4. | 17.70K | $155.37 | $2,749,272 | May 22, 2026 |
| 6 | Evans Eileen | 0.10% | SaleOpen-market or direct sale reported on Form 4. | 31.30K | $155.51 | $4,866,538 | May 22, 2026 |
| 7 | Blumenstock Gerald M | 0.07% | SaleOpen-market or direct sale reported on Form 4. | 20.49K | $152.70 | $3,129,281 | May 21, 2026 |
| 8 | Tatnall Christopher | 0.09% | SaleOpen-market or direct sale reported on Form 4. | 27.63K | $149.75 | $4,137,143 | May 20, 2026 |
| 9 | Quirk Jeanne | 0.04% | SaleOpen-market or direct sale reported on Form 4. | 11.40K | $140.22 | $1,598,508 | May 19, 2026 |
| 10 | GRAVES GREGORY B | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 5.47K | $142.51 | $779,982 | May 19, 2026 |
| 11 | GRAVES GREGORY B | 0.02% | SaleOpen-market or direct sale reported on Form 4. | 6.07K | $141.41 | $858,753 | May 19, 2026 |
| 12 | KURTZWEIL JOHN T | 0.11% | SaleOpen-market or direct sale reported on Form 4. | 32.99K | $138.79 | $4,578,738 | May 19, 2026 |
| 13 | Sutton Todd | 0.03% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 8.36K | $146.24 | $1,222,566 | May 18, 2026 |
| 14 | Mahoney Robert John | 0.05% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 15.56K | $146.24 | $2,276,226 | May 18, 2026 |
| 15 | Mahoney Robert John | 0.05% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 15.70K | $146.24 | $2,295,237 | May 18, 2026 |
| 16 | Redinbo Greg | 0.11% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 35.02K | $146.24 | $5,121,910 | May 18, 2026 |
| 17 | Redinbo Greg | 0.11% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 35.10K | $146.24 | $5,133,463 | May 18, 2026 |
| 18 | Low Russell | 0.50% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 154.90K | $146.24 | $22,652,576 | May 18, 2026 |
| 19 | Sutton Todd | 0.03% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 8.54K | $155.18 | $1,325,858 | May 15, 2026 |
| 20 | Sutton Todd | 0.03% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 8.65K | $155.18 | $1,341,841 | May 15, 2026 |
| 21 | Sutton Todd | 0.03% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 8.76K | $155.18 | $1,359,222 | May 15, 2026 |
| 22 | Sutton Todd | 0.03% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 8.98K | No cash value | No cash value | May 15, 2026 |
| 23 | Ryzhik David | 0.03% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 10.03K | $155.18 | $1,556,611 | May 15, 2026 |
| 24 | Ryzhik David | 0.03% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 10.26K | No cash value | No cash value | May 15, 2026 |
| 25 | Mahoney Robert John | 0.05% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 15.88K | $155.18 | $2,463,793 | May 15, 2026 |
| 26 | Mahoney Robert John | 0.05% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 15.94K | $155.18 | $2,473,259 | May 15, 2026 |
| 27 | Mahoney Robert John | 0.05% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 16.11K | $155.18 | $2,499,639 | May 15, 2026 |
| 28 | Mahoney Robert John | 0.05% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 16.28K | $155.18 | $2,526,486 | May 15, 2026 |
| 29 | Mahoney Robert John | 0.05% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 16.65K | No cash value | No cash value | May 15, 2026 |
| 30 | Mahoney Robert John | 0.05% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 14.71K | No cash value | No cash value | May 15, 2026 |
| 31 | Tatnall Christopher | 0.09% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 28.79K | $155.18 | $4,468,098 | May 15, 2026 |
| 32 | Tatnall Christopher | 0.09% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 28.96K | $155.18 | $4,494,478 | May 15, 2026 |
| 33 | Tatnall Christopher | 0.10% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 29.31K | $155.18 | $4,548,015 | May 15, 2026 |
| 34 | Tatnall Christopher | 0.10% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 30.05K | No cash value | No cash value | May 15, 2026 |
| 35 | Tatnall Christopher | 0.09% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 26.55K | No cash value | No cash value | May 15, 2026 |
| 36 | Blumenstock Gerald M | 0.07% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 21.65K | $155.18 | $3,360,268 | May 15, 2026 |
| 37 | Blumenstock Gerald M | 0.07% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 22.00K | $155.18 | $3,413,805 | May 15, 2026 |
| 38 | Blumenstock Gerald M | 0.07% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 22.74K | No cash value | No cash value | May 15, 2026 |
| 39 | Blumenstock Gerald M | 0.07% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 20.02K | No cash value | No cash value | May 15, 2026 |
| 40 | Redinbo Greg | 0.11% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 35.21K | $155.18 | $5,464,509 | May 15, 2026 |
| 41 | Redinbo Greg | 0.12% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 35.39K | $155.18 | $5,491,975 | May 15, 2026 |
| 42 | Redinbo Greg | 0.12% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 35.60K | $155.18 | $5,524,563 | May 15, 2026 |
| 43 | Redinbo Greg | 0.12% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 36.05K | No cash value | No cash value | May 15, 2026 |
| 44 | Redinbo Greg | 0.11% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 32.94K | No cash value | No cash value | May 15, 2026 |
| 45 | Evans Eileen | 0.10% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 32.22K | $155.18 | $5,000,055 | May 15, 2026 |
| 46 | Evans Eileen | 0.11% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 33.09K | No cash value | No cash value | May 15, 2026 |
| 47 | Evans Eileen | 0.09% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 29.20K | No cash value | No cash value | May 15, 2026 |
| 48 | Low Russell | 0.51% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 155.61K | $155.18 | $24,147,715 | May 15, 2026 |
| 49 | Low Russell | 0.51% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 157.06K | $155.18 | $24,373,192 | May 15, 2026 |
| 50 | Low Russell | 0.52% | Tax withholdingShares withheld to cover tax obligations. Usually administrative, not an open-market sale. | 158.79K | $155.18 | $24,640,411 | May 15, 2026 |
| 51 | Low Russell | 0.53% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 162.50K | No cash value | No cash value | May 15, 2026 |
| 52 | Low Russell | 0.47% | Award / grantAward, grant, or acquisition under an equity compensation plan. | 143.04K | No cash value | No cash value | May 15, 2026 |
Showing 52 of 83 matching Form 4 rows. Percent of company uses current shares outstanding when available.Load more insiders
Frequently asked
Common questions.
Who are the largest ACLS shareholders?
Axcelis Technologies Inc (ACLS) institutional holders are ranked by reported share count when ownership data publishes filing rows.
What is institutional ownership of ACLS?
Axcelis Technologies Inc (ACLS) institutional ownership appears when filing-based market data returns holder rows. TECHi does not fill unavailable ownership fields with placeholder shareholders.
Where can I see Axcelis Technologies Inc insider transactions?
Axcelis Technologies Inc (ACLS) has 83 Form 4 insider transactions on file, most recently on Jun 15, 2026, separated into purchases, sales, option exercises, awards, gifts, and tax withholding so administrative transactions are distinguished from open-market trades.
Are ACLS insiders buying or selling?
Recent ACLS insider activity reads Net selling: 23 sales and 0 purchases. Awards, gifts, conversions, and tax withholding are listed separately because they do not carry the same signal as open-market trades.
Who is the most active ACLS insider?
Low Russell is the most active ACLS insider by absolute share movement, with 1.58 million shares moving across the filing history. Review the action labels before treating that activity as buying or selling.