ACLS Axcelis Technologies (ACLS) Insider Trading, Ownership & Congress Trades
Semiconductors & Electronics · Special industry machinery, nec · CIK 0001113232
SEC filings
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
235
13F, latest reported quarter
What the filings say about ACLS
Insiders, 180 days
-$5.7M net sold
13 sellers · 0% of sales under a 10b5-1 plan
Axcelis Technologies insider trades (Form 4)
Form 4 buys and sells (codes P and S). Grants, option exercises
and conversions excluded.
Over the last 180 days, AXCELIS TECHNOLOGIES INC insiders sold a net $5.7M of stock across 130 Form 4 purchases and sales, with no insider buying. Source: SEC Form 4 filings, as of 2026-10-27.
Insider
Filed
Shares
Value
Since filing
Context
- First Form 4 purchase or sale (code P or S) here by this insider on our record.
- The trade is 22.3% of the 7,112 shares held after it.
- 12 other insiders sold within 30 days.
- 235 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Sayiner Necip sold about $249.7K of ACLS on Jun 3, 2026; 12 other insiders sold within 30 days and 235 funds added in the latest 13F quarter.Context
- 1 earlier Form 4 trade (code P or S) here by this insider (1 sale), the last on May 12, 2026.
- The trade is 8.0% of the 14,410 shares held after it.
- 12 other insiders sold within 30 days.
- 235 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: EVP Global Operations Mahoney Robert John sold about $179.3K of ACLS on Jun 2, 2026; 12 other insiders sold within 30 days and 235 funds added in the latest 13F quarter.Context
- 1 earlier Form 4 trade (code P or S) here by this insider (1 sale), the last on May 14, 2026.
- The trade is 31.4% of the 6,360 shares held after it.
- 12 other insiders sold within 30 days.
- 235 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: VP Corporate Controller Sutton Todd sold about $320.0K of ACLS on May 27, 2026; 12 other insiders sold within 30 days and 235 funds added in the latest 13F quarter.Context
- 4 earlier Form 4 trades (code P or S) here by this insider (4 sales), the last on Feb 13, 2023.
- The trade is 5.1% of the 17,695 shares held after it.
- 12 other insiders sold within 30 days.
- 235 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director St Dennis Thomas sold about $139.8K of ACLS on May 22, 2026; 12 other insiders sold within 30 days and 235 funds added in the latest 13F quarter.Context
- First Form 4 purchase or sale (code P or S) here by this insider on our record.
- The trade is 3.0% of the 31,295 shares held after it.
- 12 other insiders sold within 30 days.
- 235 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: EVP, General Counsel and Sec'y Evans Eileen sold about $144.0K of ACLS on May 22, 2026; 12 other insiders sold within 30 days and 235 funds added in the latest 13F quarter.130 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
Seven facts, ranked against the sector ·
Rank is not a forecast
Insiders
net -$5.7M over 180 days
below 52% of Semiconductors & Electronics
Congress
no House purchase disclosed in the last 12 months
Funds
235 funds bought in last quarter
more than 68% of Semiconductors & Electronics
Revenue
-17.6% year over year
below 88% of Semiconductors & Electronics
Margin
14.3% net margin
more than 82% of Semiconductors & Electronics
Buybacks
$244.0K repurchased, FY to 2026-06-30
below 91% of Semiconductors & Electronics
Short interest
4.7% of the float short (float per yahoo 2026-10-26) · 3.8 days to cover · settled 2026-09-30
more than 52% of Semiconductors & Electronics
What changed in the last 30 days
Oct 27Insider selling stopped: no sales in 90 days after 18 in the prior 90
Why it matters
The absence is the signal: 18 sales in one 90-day window and none in the next is a change of behaviour, not a filing.
Watch ACLS
A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.
The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
+34.0%12M
Insider sell
Indexed to 100, dividend-adjusted, not a price chart.
When a name files heavily, the largest trades are drawn first.
Who owns ACLS: institutional holders (13F)
13F holdings, latest reported quarter
5,029,462 sh
$952.8M
4,125,902 sh
$781.7M
2,478,878 sh
$469.6M
1,386,518 sh
$262.7M
1,231,109 sh
$233.2M
Congress trades in ACLS
No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.
Activist and 5% holders (13D/13G)
No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.
ACLS planned insider sales (Form 144)
No planned-sale notices
No insider has filed to sell. Watch this after a run-up.
ACLS mutual fund holders (N-PORT)
Funds ranked by the share of their own portfolio in this stock (N-PORT).
Firsthand Alternative Energy Fund
$757.8K position · as of 2026-06-30
4.5%
Reinhart Genesis PMV Fund
$28.6M position · as of 2026-05-31
4.0%
North Star Small Cap Value Fund
$962.6K position · as of 2026-05-31
2.8%
Guardian Small-Mid Cap Core VIP Fund
$5.7M position · as of 2026-06-30
2.7%
Boston Trust Walden Small Cap Fund
$25.0M position · as of 2026-06-30
2.4%
GMO U.S. Small Cap Value Fund
$1.0M position · as of 2026-05-31
2.3%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M ·
% is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
The complete filing record, in one place.
The record shows a net $5.7M sold by insiders over 180 days, 235 funds added last quarter. Each figure is a federal filing, dated the day it went public.
ACLS financials
Revenue growth
-17.6%
XBRL, annual
Net margin
14.3%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$866.1M
four quarters, 2025-07-01 to 2026-06-30
Revenue, TTM ACLS
| FY Dec 2025 | $839.0M |
| FY Dec 2024 | $1.0B |
| FY Dec 2023 | $1.1B |
| FY Dec 2022 | $920.0M |
| FY Dec 2021 | $662.4M |
| Jun 2026 | $215.2M |
| Mar 2026 | $199.0M |
| Dec 2025 | $238.3M |
| Sep 2025 | $213.6M |
| Jun 2025 | $194.5M |
| Mar 2025 | $192.6M |
| Dec 2024 | $252.4M |
| Sep 2024 | $256.6M |
At each fiscal year end
Single quarter
Net margin, TTM
+10.7%
net income over revenue, 2025-07-01 to 2026-06-30
Net margin, TTM ACLS
| FY Dec 2025 | +14.3% |
| FY Dec 2024 | +19.7% |
| FY Dec 2023 | +21.8% |
| FY Dec 2022 | +19.9% |
| FY Dec 2021 | +14.9% |
| Jun 2026 | +10.8% |
| Mar 2026 | +4.6% |
| Dec 2025 | +14.4% |
| Sep 2025 | +12.2% |
| Jun 2025 | +16.1% |
| Mar 2025 | +14.8% |
| Dec 2024 | +19.8% |
| Sep 2024 | +18.9% |
At each fiscal year end
Single quarter
Free cash flow, TTM
$65.6M
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Free cash flow, TTM ACLS
| FY Dec 2025 | $107.0M |
| FY Dec 2024 | $128.6M |
| FY Dec 2023 | $136.2M |
| FY Dec 2022 | $204.9M |
| FY Dec 2021 | $141.5M |
| Jun 2026 | $14.8M |
| Mar 2026 | $16.3M |
| Dec 2025 | -$8.9M |
| Sep 2025 | $43.3M |
| Jun 2025 | $37.7M |
| Mar 2025 | $34.8M |
| Dec 2024 | $8.1M |
| Sep 2024 | $41.8M |
At each fiscal year end
Single quarter
Debt to equity
n/a
no debt line filed
Debt to equity ACLS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Cash flow to debt
n/a
no debt line filed
Cash flow to debt ACLS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Return on equity
+8.9%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on equity ACLS
| FY Dec 2025 | +11.7% |
| FY Dec 2024 | +21.4% |
| FY Dec 2023 | +32.1% |
| FY Dec 2022 | +30.4% |
| FY Dec 2021 | +19.3% |
| Jun 2026 | +8.9% |
| Mar 2026 | +9.7% |
| Dec 2025 | +11.7% |
| Sep 2025 | +13.6% |
| Jun 2025 | +16.2% |
| Mar 2025 | +18.5% |
| Dec 2024 | +21.4% |
| Sep 2024 | +25.0% |
At each fiscal year end
Trailing four quarters at each quarter end
Return on assets
+6.8%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets ACLS
| FY Dec 2025 | +8.9% |
| FY Dec 2024 | +15.3% |
| FY Dec 2023 | +21.5% |
| FY Dec 2022 | +20.7% |
| FY Dec 2021 | +14.3% |
| Jun 2026 | +6.8% |
| Mar 2026 | +7.4% |
| Dec 2025 | +8.9% |
| Sep 2025 | +10.1% |
| Jun 2025 | +12.1% |
| Mar 2025 | +13.4% |
| Dec 2024 | +15.3% |
| Sep 2024 | +17.5% |
At each fiscal year end
Trailing four quarters at each quarter end
Return on invested capital
n/a
no debt line filed
Return on invested capital ACLS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Return on capital employed
+7.7%
operating income (EBIT proxy) over average of 2025-06-30 and 2026-06-30 minus current liabilities
Return on capital employed ACLS
| FY Dec 2025 | +10.4% |
| FY Dec 2024 | +19.7% |
| FY Dec 2023 | +30.2% |
| FY Dec 2022 | +31.0% |
| FY Dec 2021 | +22.3% |
| Jun 2026 | +7.7% |
| Mar 2026 | +8.5% |
| Dec 2025 | +10.4% |
| Sep 2025 | +12.3% |
| Jun 2025 | +14.6% |
| Mar 2025 | +16.9% |
| Dec 2024 | +19.7% |
| Sep 2024 | +23.2% |
At each fiscal year end
Trailing four quarters at each quarter end
P/E, trailing
36.61x
close 2026-10-26 over four quarters of diluted EPS, 2025-07-01 to 2026-06-30
P/E, trailing ACLS
| FY Dec 2025 | 21.20x |
| FY Dec 2024 | 11.36x |
| FY Dec 2023 | 17.45x |
| FY Dec 2022 | 14.53x |
| FY Dec 2021 | 25.80x |
| Jun 2026 | 63.57x |
| Mar 2026 | 29.00x |
| Dec 2025 | 21.20x |
| Sep 2025 | 23.08x |
| Jun 2025 | 14.25x |
| Mar 2025 | 9.10x |
| Dec 2024 | 11.36x |
| Sep 2024 | 15.51x |
At each fiscal year end
Trailing four quarters at each quarter end
Enterprise value
n/a
no debt line filed
Enterprise value ACLS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | n/a |
| FY Dec 2022 | n/a |
| FY Dec 2021 | n/a |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
FCF yield
+1.9%
TTM free cash flow over market value at close 2026-10-26
FCF yield ACLS
| FY Dec 2025 | +4.3% |
| FY Dec 2024 | +5.7% |
| FY Dec 2023 | +3.2% |
| FY Dec 2022 | +7.9% |
| FY Dec 2021 | +5.7% |
| Jun 2026 | +1.1% |
| Mar 2026 | +3.1% |
| Dec 2025 | +4.3% |
| Sep 2025 | +4.0% |
| Jun 2025 | +5.5% |
| Mar 2025 | +7.7% |
| Dec 2024 | +5.7% |
| Sep 2024 | +5.1% |
At each fiscal year end
Trailing four quarters at each quarter end
PEG, trailing
n/a
trailing EPS growth -39%, PEG needs growth
PEG, trailing ACLS
| FY Dec 2025 | n/a |
| FY Dec 2024 | n/a |
| FY Dec 2023 | 0.48x |
| FY Dec 2022 | 0.16x |
| FY Dec 2021 | 0.26x |
| Jun 2026 | n/a |
| Mar 2026 | n/a |
| Dec 2025 | n/a |
| Sep 2025 | n/a |
| Jun 2025 | n/a |
| Mar 2025 | n/a |
| Dec 2024 | n/a |
| Sep 2024 | n/a |
At each fiscal year end
Trailing four quarters at each quarter end
Price as of 2026-10-26. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
| 2025-12 | 2024-12 | 2023-12 | 2022-12 | |
|---|---|---|---|---|
| Revenue | $839.0M | $1.0B | $1.1B | $920.0M |
| Gross profit | $376.8M | $454.7M | $491.3M | $401.8M |
| Operating income | $119.3M | $210.8M | $265.8M | $212.4M |
| Net income | $120.2M | $201.0M | $246.3M | $183.1M |
| EPS (diluted) | 3.80 | 6.15 | 7.43 | 5.46 |
| Operating cash flow | $118.3M | $140.8M | $156.9M | $215.6M |
| Cash | $145.5M | $123.5M | $167.3M | $185.6M |
| Buybacks | $121.1M | $60.5M | $52.5M | $57.5M |
SEC XBRL, fiscal years, as known on 2026-10-27
ACLS Stock Sonar score 5/7 axes
Find similar shapesCompareACLS ranks highest on institutional and government (68th percentile) and profitability (65th), and lowest on growth (12th), among Semiconductors & Electronics peers.
5 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored
ACLS filings, in plain words
Are Axcelis Technologies insiders buying or selling ACLS?
In the 180 days to 2026-10-27, Axcelis Technologies insiders were net sellers, a net $5.7M across purchases and sales reported on Form 4, by 13 sellers.
Read the full summary
In the 180 days to 2026-10-27, Axcelis Technologies insiders were net sellers of ACLS, a net $5.7M across purchases and sales reported on Form 4 by 13 sellers. None of the 18 insider sales was flagged as made under a Rule 10b5-1 plan. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.
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