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SEC Form 4 · last 90 days
When several insiders buy at once, pay attention.
A single insider buying is noise as often as signal. A cluster buy— two or more different insiders buying the same stock on the open market within weeks of each other — is much harder to dismiss. Here's where it's happening now.
30
Active clusters
$346.57M
Total cluster buying
TSM
TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD
30 insiders buying
$193K
Oct 7, 2026 – Nov 1, 2026
- Yuan Lipen · VP$75K
- Wei Che-Chia · Chairman and CEO$11K
- Mii Yuh-Jier · EVP and Co-COO$5K
- Chin Yung-Pei · EVP and Co-COO$5K
- Hou Yung-Chin · SVP and Deputy Co-COO$5K
- Zhang Kevin Xiaoqiang · SVP and Deputy Co-COO$5K
- Fang Shu-Hua · SVP and GC$4K
- Wu Shien-Yang · SVP$4K
- Hsu Kuo-Chin · VP$4K
- Wang Ying-Lang · SVP$4K
- Yeap Choh Fei · SVP$4K
- Cao Min · VP$4K
- Chang Tzonz-Sheng · SVP$4K
- Lee Chun-Hsien · SVP$4K
- Yoo Chue-San · VP$4K
- Lu Lee-Chung · VP$4K
- Tien Bor-Zen · VP$4K
- Chuang Juiping · VP$4K
- Chuang Tzu-Sou · VP$4K
- Jang Syun-Ming · VP$4K
- Ku Yao-Ching · VP$4K
- Lin Chris Horng-Dar · VP and CIO$3K
- Lin Shyue-Shyh · VP$3K
- Chen Pei-Hung · VP$3K
- He Jun · VP$3K
- Hwang Yuan-Ko · VP$3K
- Wu Yi-Huang · VP$3K
- Lu Chin-Sheng · VP$3K
- Chen Chih-Ho · Controller$2K
- Huang Jen-Chau · SVP and CFO$2K
HEI
HEICO CORP
8 insiders buying
$1.40M
Oct 8, 2026
- Fine Carol F. · Director$175K
- MENDELSON VICTOR H · Co-COB and Co-CEO$175K
- HENRIQUES ADOLFO · Director$175K
- SCHRIESHEIM ALAN · Director$175K
- CULLIGAN THOMAS M · Director$175K
- Hildebrandt Mark H · Director$175K
- CHERUVATATH NANDAKUMAR · Director$175K
- Neitzel Julie · Director$175K
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A cluster buy counts distinct insiders (by SEC CIK) making open-market purchases (Form 4 transaction code P) of the same issuer within a 90-day window. Data is sourced from public SEC filings and is for informational purposes only — not investment advice. Cluster buying is one signal among many and does not guarantee future performance.