Dennis Thomas St

ACLS

Dennis Thomas St serves as director at Axcelis Technologies, Inc. (ACLS). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

1 trades

$54.0K

Total Sells

14 trades

$4.44M

Net Position

Net Seller

$4.38M

Companies Traded

FORM, VECO, ACLS

Active Period

Aug 2021 – Feb 2026

15 total trades

Most Recent

Sell FORM

Feb 11, 2026 · $697.4K

Dennis Thomas St's Insider Trading at Axcelis Technologies, Inc. (ACLS)

Buys

0 · $0.00

Sells

4 · $2.15M

Total Shares Bought

Total Shares Sold

21,500

ACLS Price Chart

Loading chart...

Date	Type	Shares	Avg Price	Value
Feb 13, 2023	Sell	12,000	$127.02	$1.52M
Nov 18, 2022	Sell	3,000	$76.66	$230.0K
Feb 10, 2022	Sell	3,000	$72.81	$218.4K
Aug 30, 2021	Sell	3,500	$50.32	$176.1K

Dennis Thomas St's Insider Trading at FormFactor, Inc. (FORM)

Buys

0 · $0.00

Sells

8 · $1.94M

Total Shares Bought

Total Shares Sold

40,323

FORM Price Chart

Loading chart...

Date	Type	Shares	Avg Price	Value	Shares After
Feb 11, 2026	Sell	7,431	$93.84	$697.4K	33,356
Nov 17, 2025	Sell	2,000	$49.85	$99.7K	38,957
May 30, 2025	Sell	3,000	$31.24	$93.7K	40,957
Nov 6, 2024	Sell	3,100	$39.11	$121.2K	37,429
May 13, 2024	Sell	2,000	$56.30	$112.6K	36,701
Nov 15, 2023	Sell	3,792	$38.24	$145.0K	38,701
Feb 17, 2023	Sell	13,000	$32.31	$420.0K	30,890
Feb 9, 2022	Sell	6,000	$41.63	$249.8K	40,098