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© 2026 Insider Trade Flow. Not financial advice. All data sourced from public SEC filings, 13F reports, and Polymarket.
4 Active Clusters

Cluster Buying
Signals

When multiple insiders buy the same stock within a short window, it often signals exceptional confidence. Track real-time cluster activity across all sectors.

4
Buy Clusters
0
Sell Clusters
0
Strong Signals
$956.3K
Total Volume
Period:
7 Days30 Days90 Days
Type:
Buy ClustersSell ClustersAll
Amrize LtdAMRZ
Unknown·1 day·Aug 25, 2026 - Aug 26, 2026
3
Insiders
$407.5K
Volume
Moderate Signal
Sanche Jacques Wolf
Executive
$186.8K
4,150 shares

What is Cluster Buying?

Cluster buying occurs when multiple corporate insiders purchase shares of their company within a short time window. This pattern is considered one of the strongest signals of insider confidence.

When three or more executives independently decide to buy shares around the same time, it suggests they collectively believe the stock is undervalued. Research shows that cluster buys with CEO or CFO participation tend to have even stronger predictive value.

Signal Strength Scoring

  • +10 points3 or more insiders participating
  • +5 pointsCEO participating
  • +5 pointsCFO participating
  • +5 pointsAverage purchase over $200K
  • -5 pointsIncludes 10b5-1 planned trades

Get Cluster Buy Alerts

Be the first to know when multiple insiders start buying. Set up real-time alerts for cluster activity.

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Singleton Denise R
Chief Legal Officer & Corp Sec
$154.4K
3,500 shares
Forrest Nollaig
Chief Mktg & Corp Affairs Off
$66.2K
1,500 shares
View AMRZ Company Page
Ameresco, Inc.AMRC
Unknown·3 days·Aug 24, 2026 - Aug 27, 2026
3
Insiders
$357.6K
Volume
Weak Signal
Sutton Joseph W.
Executive
$202.4K
9,700 shares
Sakellaris George P
Executive
$113.3K
5,000 shares
Miller Jennifer L
Executive
$41.9K
2,000 shares
View AMRC Company Page
Horizon Kinetics Holding CorpHKHC
Unknown·3 days·Aug 24, 2026 - Aug 27, 2026
3
Insiders
$83.2K
Volume
Weak Signal
Rosenthal Brent D
Executive
$54.0K
2,000 shares
Brennan Alice C
Executive
$15.9K
600 shares
Roller Daniel J
Executive
$13.3K
500 shares
View HKHC Company Page
BIOMERICA INCBMRA
Unknown·Same day·Aug 26, 2026 - Aug 26, 2026
4
Insiders
$108.0K
Volume
Weak Signal
Irani Zackary S.
Executive
$50.0K
31,250 shares
BARBIERI ALLEN
Executive
$32.0K
20,000 shares
MOATAZEDI DAVID
Executive
$16.0K
10,000 shares
Chin Eric
Executive
$10.0K
6,250 shares
View BMRA Company Page