ACLS SEC Filing News — Axcelis Technologies, Inc.

Latest SEC filings for Axcelis Technologies, Inc. (ACLS) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-16.

Axcelis Technologies, Inc. designs, manufactures, and services ion implantation and other processing equipment used in the fabrication of semiconductor chips in the United States, Europe, and the Asia Pacific. The company provides high energy, high current, and medium current implanters for various application requirements. It also offers aftermarket lifecycle products and services, including used tools, spare parts, equipment upgrades, maintenance services, and customer training. The company se…
Sector: Technology Industry: Semiconductor Equipment & Materials Market Cap: $3.4B CIK: 1113232
20
Total Filings
0
Bullish Classifications
7
Bearish Classifications
12
Insider Transactions
1
Material Events (8-K)
1
Periodic Reports
Rule-based classifications for ACLS currently lean bearish. Of the 20 filing records displayed, 7 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
ACLS Filing Activity Snapshot 2026-05-21 — 2026-09-16
Insider Transactions (Form 4)
0 buys vs 7 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$320.0K
Sutton Todd (VP Corporate Controller) · 2026-05-28
2,000 shares · Form 4
Form 144 Notices
6
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 12 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 12 filings in this group are Form 4s for Axcelis Technologies, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 12 insider filings shown, the breakdown is 7 open-market sale and 5 tax withholding. 7 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×7
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Tax withholding ×5
Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.
Form 4 Tax withholding Tax / Compensation Filing 2026-09-16

ACLS insider Form 4 filed for equity award, exercise, or tax withholding

Redinbo Greg (EVP and Chief Strategy Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code Nature Shares Price Value
F Tax withholding on vested shares 208 $105.04 $21.8K
Filing: Form 4 (Insider Transaction) Insider: Redinbo Greg (EVP and Chief Strategy Officer) Shares: 208
View on SEC EDGAR → Open Filing Document →
Form 4 Tax withholding Tax / Compensation Filing 2026-09-16

ACLS insider Form 4 filed for equity award, exercise, or tax withholding

Tatnall Christopher (EVP Global Customer Operations) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code Nature Shares Price Value
F Tax withholding on vested shares 136 $105.04 $14.3K
Filing: Form 4 (Insider Transaction) Insider: Tatnall Christopher (EVP Global Customer Operations) Shares: 136
View on SEC EDGAR → Open Filing Document →
Form 4 Tax withholding Tax / Compensation Filing 2026-07-17

ACLS insider Form 4 filed for equity award, exercise, or tax withholding

Ryzhik David (SVP Interim CFO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code Nature Shares Price Value
F Tax withholding on vested shares 127 $145.01 $18.4K
F Tax withholding on vested shares 94 $145.01 $13.6K
Filing: Form 4 (Insider Transaction) Insider: Ryzhik David (SVP Interim CFO) Shares: 221
View on SEC EDGAR → Open Filing Document →
Form 4 Tax withholding Tax / Compensation Filing 2026-06-17

ACLS insider Form 4 filed for equity award, exercise, or tax withholding

Ryzhik David (SVP Interim CFO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code Nature Shares Price Value
F Tax withholding on vested shares 76 $176.84 $13.4K
Filing: Form 4 (Insider Transaction) Insider: Ryzhik David (SVP Interim CFO) Shares: 76
View on SEC EDGAR → Open Filing Document →
Form 4 Tax withholding Tax / Compensation Filing 2026-06-16

ACLS insider Form 4 filed for equity award, exercise, or tax withholding

Blumenstock Gerald M (EVP, Research, Dev. & Eng.) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code Nature Shares Price Value
F Tax withholding on vested shares 506 $191.60 $96.9K
Filing: Form 4 (Insider Transaction) Insider: Blumenstock Gerald M (EVP, Research, Dev. & Eng.) Shares: 506
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-06-04

ACLS insider Sayiner Necip (Director) sold 1,586 shares (~$249.7K)

Sayiner Necip, listed as Director at AXCELIS TECHNOLOGIES INC, reported an open-market sale of 1,586 ACLS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 1,586 $157.44 $249.7K
Filing: Form 4 (Insider Transaction) Insider: Sayiner Necip (Director) Shares: 1,586 Est. Value: $249.7K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-06-03

ACLS insider Mahoney Robert John (EVP Global Operations) sold 1,155 shares (~$179.3K)

Mahoney Robert John, listed as EVP Global Operations at AXCELIS TECHNOLOGIES INC, reported an open-market sale of 1,155 ACLS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 1,155 $155.24 $179.3K
Filing: Form 4 (Insider Transaction) Insider: Mahoney Robert John (EVP Global Operations) Shares: 1,155 Est. Value: $179.3K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-05-28

ACLS insider Sutton Todd (VP Corporate Controller) sold 2,000 shares (~$320.0K)

Sutton Todd, listed as VP Corporate Controller at AXCELIS TECHNOLOGIES INC, reported an open-market sale of 2,000 ACLS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,000 $159.99 $320.0K
Filing: Form 4 (Insider Transaction) Insider: Sutton Todd (VP Corporate Controller) Shares: 2,000 Est. Value: $320.0K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-05-26

ACLS insider St Dennis Thomas (Director) sold 900 shares (~$139.8K)

St Dennis Thomas, listed as Director at AXCELIS TECHNOLOGIES INC, reported an open-market sale of 900 ACLS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 900 $155.37 $139.8K
Filing: Form 4 (Insider Transaction) Insider: St Dennis Thomas (Director) Shares: 900 Est. Value: $139.8K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-05-22

ACLS insider Evans Eileen (EVP, General Counsel and Sec'y) sold 926 shares (~$144.0K)

Evans Eileen, listed as EVP, General Counsel and Sec'y at AXCELIS TECHNOLOGIES INC, reported an open-market sale of 926 ACLS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 926 $155.51 $144.0K
Filing: Form 4 (Insider Transaction) Insider: Evans Eileen (EVP, General Counsel and Sec'y) Shares: 926 Est. Value: $144.0K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-05-22

ACLS insider Blumenstock Gerald M (EVP, Research, Dev. & Eng.) sold 1,161 shares (~$177.3K)

Blumenstock Gerald M, listed as EVP, Research, Dev. & Eng. at AXCELIS TECHNOLOGIES INC, reported an open-market sale of 1,161 ACLS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 1,161 $152.70 $177.3K
Filing: Form 4 (Insider Transaction) Insider: Blumenstock Gerald M (EVP, Research, Dev. & Eng.) Shares: 1,161 Est. Value: $177.3K
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-05-21

ACLS insider Tatnall Christopher (EVP Global Customer Operations) sold 1,166 shares (~$174.6K)

Tatnall Christopher, listed as EVP Global Customer Operations at AXCELIS TECHNOLOGIES INC, reported an open-market sale of 1,166 ACLS shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 1,166 $149.75 $174.6K
Filing: Form 4 (Insider Transaction) Insider: Tatnall Christopher (EVP Global Customer Operations) Shares: 1,166 Est. Value: $174.6K
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 6 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Axcelis Technologies, Inc. has 6 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-06-03

ACLS Form 144 filed for proposed insider sale by NECIP SAYINER (1,586 shares) ~$249.7K

NECIP SAYINER filed a Form 144 with the SEC indicating intent to sell ACLS (AXCELIS TECHNOLOGIES INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: NECIP SAYINER Shares: 1,586 Est. Value: $249.7K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-06-02

ACLS Form 144 filed for proposed insider sale by ROBERT MAHONEY (1,155 shares) ~$179.3K

ROBERT MAHONEY filed a Form 144 with the SEC indicating intent to sell ACLS (AXCELIS TECHNOLOGIES INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: ROBERT MAHONEY Shares: 1,155 Est. Value: $179.3K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-05-27

ACLS Form 144 filed for proposed insider sale

An insider at AXCELIS TECHNOLOGIES INC filed a Form 144 notifying the SEC of an intent to sell shares. Form 144 is a proposed sale notice rather than confirmation that a sale already happened.

Filing: Form 144 (Proposed Sale Notice)
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-05-22

ACLS Form 144 filed for proposed insider sale by THOMAS M. ST. DENNIS (900 shares) ~$139.8K

THOMAS M. ST. DENNIS filed a Form 144 with the SEC indicating intent to sell ACLS (AXCELIS TECHNOLOGIES INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: THOMAS M. ST. DENNIS Shares: 900 Est. Value: $139.8K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-05-22

ACLS Form 144 filed for proposed insider sale by EILEEN EVANS (926 shares) ~$144.0K

EILEEN EVANS filed a Form 144 with the SEC indicating intent to sell ACLS (AXCELIS TECHNOLOGIES INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: EILEEN EVANS Shares: 926 Est. Value: $144.0K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-05-21

ACLS Form 144 filed for proposed insider sale by GERALD BLUMENSTOCK (1,161 shares) ~$177.3K

GERALD BLUMENSTOCK filed a Form 144 with the SEC indicating intent to sell ACLS (AXCELIS TECHNOLOGIES INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: GERALD BLUMENSTOCK Shares: 1,161 Est. Value: $177.3K
View on SEC EDGAR → Open Filing Document →
Material Events 1 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There is 1 in this period for Axcelis Technologies, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-06

ACLS filed 8-K — material company event

AXCELIS TECHNOLOGIES INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)
View on SEC EDGAR → Open Filing Document →
Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for Axcelis Technologies, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-06

ACLS filed Quarterly Report (10-Q)

AXCELIS TECHNOLOGIES INC filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)
View on SEC EDGAR → Open Filing Document →

How we classify Axcelis Technologies, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on ACLS. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — ACLS SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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