What is a cluster buy?

Two or more different insiders at the same company buying its stock on the open market within a short window. One insider buying can have many explanations; several people independently spending their own money on the same stock is harder to explain away, which is why cluster buys are the most watched pattern in insider data.

Are cluster buys a buy signal?

No signal is. Clusters sometimes follow a sharp price drop that insiders consider overdone, sometimes a board agreeing to show support, and sometimes a financing. This site's backtest of recent filings found insider purchases as a group lagged the S&P 500 over the next 90 days. Use a cluster as a reason to read the company's filings, not as a trade.

Which insiders count?

Officers, directors and holders of more than 10% who file Form 4. Each person is counted once per company however many separate purchases they made; only open-market purchases (transaction code P) count, never grants or option exercises.

Live insider dashboard

Last 30 days · Aug 14, 2026 – Sep 13, 2026

Cluster buys

Companies where two or more different insiders bought shares on the open market in the last 30 days, most buyers first. Each is several people deciding separately to put their own money into the same stock.

For every single purchase, not just clusters, see the insider buying list.

Cluster buys: 24
Insiders involved: 60
Bought in clusters: $90.7M
Most buyers in one: 5

BWFG5 buyers
Bankwell Financial Group, Inc.
Sep 08, 2026
$602.7K
- Seidman Lawrence B · 10% Owner$519.9K
- Dale Eric J · Director$35.6K
- Porto Carl M · Director$21.9K
- Dunne Jeffrey R · Director$17.5K
- Drexler Blake S · Director$7.8K
NONE4 buyers
EBR Systems, Inc.
Aug 21, 2026 – Sep 08, 2026
$23.5M
- Host-Plus Pty Ltd as trustee for the HOSTPLUS Pooled Superannuation Trust · 10% Owner$20.8M
- Ressler Richard S · CEO & President$2.7M
- Hall Bjorn · Secretary and CCO$1K
- Booth Richard Whitaker · See Explanation of Responses$500
GME4 buyers
GameStop Corp.
Sep 08, 2026 – Sep 10, 2026
$21.7M
- Cohen Ryan · President, CEO and Chairman$20.4M
- Cheng Lawrence · Director$1M
- Grube James · Director$196.1K
- Attal Alain · Director$100K
GPUS4 buyers
Hyperscale Data, Inc.
Sep 04, 2026 – Sep 11, 2026
$1M
- Ault Milton C III · Executive Chairman$933.2K
- Nisser Henry Carl · President and General Counsel$46.8K
- Horne William B. · Chief Executive Officer$31.2K
- Cragun Kenneth S · Chief Financial Officer$18.7K
ODYS3 buyers
Odysight.ai Inc.
Aug 20, 2026
$3.9M
- Arkin Moshe · 10% Owner$3.6M
- Goldwasser Benad · Director$150K
- Vurembrand Zeev · Director$100K
INBX3 buyers
Inhibrx Biosciences, Inc.
Sep 08, 2026
$3.5M
- Lappe Mark · Chief Executive Officer$2.6M
- Kayyem Jon Faiz · Director$567.6K
- Forsyth Douglas · Director$286.6K
RGCO3 buyers
RGC RESOURCES INC
Sep 10, 2026
$46.5K
- Williamson John B III · Director$27.9K
- Nester Paul W · President & CEO$10.7K
- Johnston Robert B · Director$7.9K
UBER2 buyers
Uber Technologies, Inc
Sep 04, 2026 – Sep 10, 2026
$15.3M
- Khosrowshahi Dara · Chief Executive Officer$10M
- Macdonald Andrew · See Remarks$5.3M
CYBN2 buyers
CYBIN INC.
Sep 08, 2026
$8.3M
- Glavine Paul · Chief Growth Officer$4.7M
- So Eric H. L. · Executive Chair$3.6M
AMR2 buyers
Alpha Metallurgical Resources, Inc.
Aug 21, 2026 – Sep 08, 2026
$5.5M
- Courtis Kenneth S. · Director$3.4M
- Gorzynski Michael · 10% Owner$2.1M
DXYZ2 buyers
Destiny Tech100 Inc.
Aug 31, 2026 – Sep 03, 2026
$1.8M
- Prasad Sohail · President and CEO$1.8M
- Silver Ethan · Chief Operating Officer$25K
PRTS2 buyers
CarParts.com, Inc.
Sep 10, 2026
$1.8M
- Meniane David · CEO$882.5K
- Huffaker Michael · COO$881.8K
RLMD2 buyers
RELMADA THERAPEUTICS, INC.
Sep 10, 2026
$1.7M
- Shenouda Maged · Chief Financial Officer$844K
- Traversa Sergio · Chief Executive Officer$828K
REFI2 buyers
Chicago Atlantic Real Estate Finance, Inc.
Aug 19, 2026 – Aug 27, 2026
$561.2K
- Mazarakis John · Executive Chairman$508.9K
- Sack Peter · Co-Chief Executive Officer$52.2K
ENOV2 buyers
Enovis CORP
Sep 04, 2026
$449.6K
- McDonald Damien · Chief Executive Officer$249.6K
- Engert Oliver · Chief Administrative Officer$200K
KMT2 buyers
KENNAMETAL INC
Sep 04, 2026 – Sep 10, 2026
$354.8K
- Chowbey Sanjay · President and CEO$203.7K
- Harshman Richard J · Director$151.1K
GRCE2 buyers
Grace Therapeutics, Inc.
Sep 09, 2026
$245.9K
- Kohli Prashant · Chief Executive Officer$214K
- Opaleye Management Inc. · 10% Owner$31.9K
LUCK2 buyers
Lucky Strike Entertainment Corp
Sep 09, 2026 – Sep 10, 2026
$179.1K
- Shannon Thomas F. · Chief Executive Officer$175.8K
- Bass Robert J · Director$3.3K
FGBI2 buyers
First Guaranty Bancshares, Inc.
Sep 09, 2026 – Sep 10, 2026
$117.7K
- Walker Robert W · Director$92.7K
- McAnally Bruce · Director$25K
NTHI2 buyers
NEONC TECHNOLOGIES HOLDINGS, INC.
Aug 17, 2026 – Aug 18, 2026
$103.1K
- Chen Thomas C · CEO$90K
- Heshmatpour Amir F · CEO, President$13.1K
CBU2 buyers
COMMUNITY FINANCIAL SYSTEM, INC.
Aug 27, 2026 – Sep 09, 2026
$45K
- Singh Savneet · Director$25K
- Vaccaro John A · Director$20K
EMYB2 buyers
Embassy Bancorp, Inc.
Aug 26, 2026 – Aug 28, 2026
$34.5K
- Lesavoy Bernard M · Director$32.2K
- Lobach David M Jr · Chairman, President and CEO$2.2K
BRN2 buyers
BARNWELL INDUSTRIES INC
Sep 08, 2026 – Sep 09, 2026
$17.4K
- Horowitz Joshua · Director$10.4K
- Patman Philip F Jr · CFO and Treasurer$7K
CZNC2 buyers
CITIZENS & NORTHERN CORP
Sep 04, 2026
$4.9K
- Pellegrino Frank G · Director$4.7K
- Shattuck Katherine W · Director$209.3

Questions

What is a cluster buy?: Two or more different insiders at the same company buying its stock on the open market within a short window. One insider buying can have many explanations; several people independently spending their own money on the same stock is harder to explain away, which is why cluster buys are the most watched pattern in insider data.
Are cluster buys a buy signal?: No signal is. Clusters sometimes follow a sharp price drop that insiders consider overdone, sometimes a board agreeing to show support, and sometimes a financing. This site's backtest of recent filings found insider purchases as a group lagged the S&P 500 over the next 90 days. Use a cluster as a reason to read the company's filings, not as a trade.
Which insiders count?: Officers, directors and holders of more than 10% who file Form 4. Each person is counted once per company however many separate purchases they made; only open-market purchases (transaction code P) count, never grants or option exercises.

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