MarketPeel
Insider Trading Intelligence
DS

Dennis Thomas St

FORM
DIRECTOR · FORMFACTOR INC · CIK 0001339595
FILING MIX · LIFETIME49%/51%
BUYS
26
SELLS
27
TOTAL VALUE
$6.07M
COMPANIES
3
ACTIVE SINCE
Feb 2020
HOLDINGS NOW
107,725
AVG SELL PX
$54.95
TRADE KIND
SHOWING 53 / 53
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
21 backtested trades · 8 horizons · 15 pending
Forward-return performance of every backtestable P/S trade by Dennis Thomas St, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d21+57.14%-0.59%+0.08%-0.67%-1.70%
14d21+52.38%+0.19%-0.01%+0.34%-0.07%
30d21+47.62%-0.54%-1.59%+1.06%-1.11%
60d21(1 pending)+30.00%+8.36%+1.27%+7.09%+3.37%
90d21(1 pending)+55.00%+13.81%+2.87%+10.95%-0.90%
180d21(3 pending)+44.44%+21.08%+7.64%+13.44%+5.64%
1y21(4 pending)+35.29%+37.58%+17.24%+2.80%+0.18%
2y21(6 pending)+26.67%+66.86%+38.50%+28.36%+15.48%
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
FORM · 28,333 shares · as of Jun 16, 2026
011,52523,04934,57446,098202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 26 buys / 27 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
FORM
FORMFACTOR INC
SALEGRANT
Gift
74028,333Jun 16, 2026Jun 16, 2026View →
FORM
FORMFACTOR INC
SALE
2,800$151.49$424.2K29,073Jun 15, 2026Jun 16, 2026View →
ACLS
AXCELIS TECHNOLOGIES INC
SALE
900$155.37$139.8K17,695May 22, 2026May 26, 2026View →
FORM
FORMFACTOR INC
SALE
1,000$115.84$115.8K31,873May 19, 2026May 21, 2026View →
ACLS
AXCELIS TECHNOLOGIES INC
PURCHASEGRANT
Stock grant
1,44018,595May 15, 2026May 18, 2026View →
FORM
FORMFACTOR INC
PURCHASEGRANT
Stock grant
1,34732,873May 15, 2026May 19, 2026View →
VECO
VEECO INSTRUMENTS INC
SALE
1,400$61.93$86.7K61,697May 11, 2026May 13, 2026View →
VECO
VEECO INSTRUMENTS INC
PURCHASEGRANT
Stock grant
2,94563,097May 8, 2026May 11, 2026View →
FORM
FORMFACTOR INC
SALE
1,830$94.24$172.5K31,526Feb 10, 2026Feb 11, 2026View →
FORM
FORMFACTOR INC
SALE
5,601$93.71$524.9K33,356Feb 10, 2026Feb 11, 2026View →
FORM
FORMFACTOR INC
SALE
2,000$49.85$99.7K38,957Nov 17, 2025Nov 17, 2025View →
FORM
FORMFACTOR INC
SALE
3,000$31.24$93.7K40,957May 29, 2025May 30, 2025View →
FORM
FORMFACTOR INC
PURCHASEGRANT
Stock grant
6,52843,957May 16, 2025May 16, 2025View →
ACLS
AXCELIS TECHNOLOGIES INC
PURCHASEGRANT
Stock grant
3,58617,155May 15, 2025May 15, 2025View →
VECO
VEECO INSTRUMENTS INC
PURCHASEGRANT
Stock grant
8,29160,152May 9, 2025May 9, 2025View →
FORM
FORMFACTOR INC
SALE
3,100$39.11$121.2K37,429Nov 5, 2024Nov 6, 2024View →
FORM
FORMFACTOR INC
PURCHASEGRANT
Stock grant
3,82840,529May 17, 2024May 21, 2024View →
ACLS
AXCELIS TECHNOLOGIES INC
PURCHASEGRANT
Stock grant
1,16213,069May 15, 2024May 15, 2024View →
ACLS
AXCELIS TECHNOLOGIES INC
PURCHASEGRANT
Stock grant
1,66213,569May 15, 2024May 16, 2024View →
VECO
VEECO INSTRUMENTS INC
SALE
4,000$37.72$150.9K51,861May 13, 2024May 14, 2024View →
VECO
VEECO INSTRUMENTS INC
PURCHASEGRANT
Stock grant
3,67755,861May 10, 2024May 10, 2024View →
FORM
FORMFACTOR INC
SALE
2,000$56.30$112.6K36,701May 10, 2024May 13, 2024View →
VECO
VEECO INSTRUMENTS INC
SALE
7,005$28.52$199.8K52,184Nov 30, 2023Dec 1, 2023View →
FORM
FORMFACTOR INC
SALE
3,792$38.24$145.0K38,701Nov 14, 2023Nov 15, 2023View →
FORM
FORMFACTOR INC
PURCHASEGRANT
Stock grant
6,77042,493May 19, 2023May 30, 2023View →
ACLS
AXCELIS TECHNOLOGIES INC
PURCHASEGRANT
Stock grant
1,28211,907May 15, 2023May 15, 2023View →
VECO
VEECO INSTRUMENTS INC
PURCHASEGRANT
Stock grant
6,76059,189May 12, 2023May 15, 2023View →
FORM
FORMFACTOR INC
SALE
13,000$32.31$420.0K30,890Feb 16, 2023Feb 17, 2023View →
ACLS
AXCELIS TECHNOLOGIES INC
SALE
12,000$127.02$1.52M10,625Feb 13, 2023Feb 13, 2023View →
ACLS
AXCELIS TECHNOLOGIES INC
SALE
3,000$76.66$230.0K22,625Nov 18, 2022Nov 18, 2022View →
FORM
FORMFACTOR INC
PURCHASEGRANT
Stock grant
4,8334,833May 27, 2022Jun 1, 2022View →
ACLS
AXCELIS TECHNOLOGIES INC
PURCHASEGRANT
Stock grant
2,68925,625May 16, 2022May 16, 2022View →
VECO
VEECO INSTRUMENTS INC
PURCHASE
2,500$21.60$54.0K52,429May 16, 2022May 17, 2022View →
FORM
FORMFACTOR INC
SALE
3,7920May 14, 2022May 17, 2022View →
FORM
FORMFACTOR INC
PURCHASE
3,79243,890May 14, 2022May 17, 2022View →
VECO
VEECO INSTRUMENTS INC
PURCHASEGRANT
Stock grant
6,591May 13, 2022May 17, 2022View →
ACLS
AXCELIS TECHNOLOGIES INC
SALE
3,000$72.81$218.4K22,936Feb 10, 2022Feb 10, 2022View →
FORM
FORMFACTOR INC
SALE
6,000$41.63$249.8K40,098Feb 8, 2022Feb 9, 2022View →
ACLS
AXCELIS TECHNOLOGIES INC
SALE
3,500$50.32$176.1K25,936Aug 30, 2021Aug 30, 2021View →
ACLS
AXCELIS TECHNOLOGIES INC
PURCHASEGRANT
Stock grant
3,49729,436May 17, 2021May 17, 2021View →
FORM
FORMFACTOR INC
SALE
7,0980May 17, 2021May 18, 2021View →
FORM
FORMFACTOR INC
PURCHASE
7,09846,098May 17, 2021May 18, 2021View →
FORM
FORMFACTOR INC
PURCHASEGRANT
Stock grant
3,7923,792May 14, 2021May 18, 2021View →
VECO
VEECO INSTRUMENTS INC
PURCHASEGRANT
Stock grant
5,37843,338May 7, 2021May 10, 2021View →
FORM
FORMFACTOR INC
PURCHASE
9,00039,000May 18, 2020May 18, 2020View →
FORM
FORMFACTOR INC
SALE
9,0000May 18, 2020May 18, 2020View →
ACLS
AXCELIS TECHNOLOGIES INC
PURCHASEGRANT
Stock grant
6,88125,939May 15, 2020May 15, 2020View →
FORM
FORMFACTOR INC
PURCHASEGRANT
Stock grant
7,0987,098May 15, 2020May 18, 2020View →
ACLS
AXCELIS TECHNOLOGIES INC
SALE
6,000$26.61$159.7K19,058May 11, 2020May 11, 2020View →
FORM
FORMFACTOR INC
SALE
6,000$24.78$148.7K30,000May 11, 2020May 12, 2020View →
VECO
VEECO INSTRUMENTS INC
PURCHASEGRANT
Stock grant
10,38937,960May 8, 2020May 8, 2020View →
ACLS
AXCELIS TECHNOLOGIES INC
SALE
8,500$28.27$240.3K25,058Feb 10, 2020Feb 10, 2020View →
FORM
FORMFACTOR INC
SALE
10,000$25.94$259.4K36,000Feb 10, 2020Feb 10, 2020View →
Other insiders · FORM
Loading peer insiders…
About this filer
CIK 0001339595
ROLE
Director
PRIMARY
FORM
COMPANIES
3
ACTIVE SINCE
Feb 2020
MARKETPEEL · /INSIDER/0001339595DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

One short email. Insider buys, congressional trades, and plain-English analysis.

Feedback