Cluster buys: 99 stocks where three or more insiders bought together in the last six weeks
A cluster is a window of at most 60 days in which three or more insiders bought the same stock on the open market. Since Aug 15, 2026, 99 such windows have closed. The strongest, by the members-area score, is Cardinal Infrastructure Group Inc. (CDNL): 7 buyers, $8.5M in total, score 93 out of 100.
The ten strongest clusters
| Ticker | Company | Window | Buyers | Filings | Bought | Score | Since start |
|---|---|---|---|---|---|---|---|
| CDNL | Cardinal Infrastructure Group Inc. | 2026-08-14 → 2026-08-17 | 7 | 7 | $8.5M | 93 | -29.3% |
| DKS | DICK'S SPORTING GOODS, INC. | 2026-08-26 → 2026-09-23 | 6 | 7 | $5.1M | 91 | +1.4% |
| CAMP | Camp4 Therapeutics Corp | 2026-08-03 → 2026-08-31 | 5 | 6 | $5.0M | 91 | -2.8% |
| GME | GameStop Corp. | 2026-09-08 → 2026-09-21 | 4 | 6 | $48.5M | 89 | +5.3% |
| AMRZ | Amrize Ltd | 2026-08-11 → 2026-09-02 | 11 | 11 | $2.6M | 89 | -11.4% |
| ELAN | Elanco Animal Health Inc | 2026-08-07 → 2026-08-20 | 5 | 5 | $1.5M | 87 | -4.7% |
| RWT | REDWOOD TRUST INC | 2026-09-15 → 2026-09-21 | 6 | 7 | $1.4M | 86 | -4.5% |
| LUCK | Lucky Strike Entertainment Corp | 2026-08-28 → 2026-09-22 | 5 | 5 | $875k | 85 | +0.2% |
| GAM | GENERAL AMERICAN INVESTORS CO INC | 2026-09-15 → 2026-09-23 | 5 | 6 | $672k | 84 | -1.3% |
| AVBC | Avidia Bancorp, Inc. | 2026-08-11 → 2026-09-14 | 5 | 6 | $587k | 84 | -2.1% |
"Since start" is the share price change from the first buy in the window to the latest close. Score weights the number of buyers, who they are (officers over funds), the dollar size relative to the company, conviction (buying the dip, first-ever buys) and penalises offerings and placements. The cluster guide has the full recipe.
Spotlight: Cardinal Infrastructure Group Inc. (CDNL)
Between Aug 14, 2026 and Aug 17, 2026, 7 distinct insiders filed 7 purchases of CDNL worth $8.5M. The largest: Spivey Jeremy Simmons (Chief Executive Officer) — $3.2M at $38.41; Wood Anthony Leon Jr. — $2.0M at $39.36; Lee Richard Melvin Jr. — $1.3M at $36.82. Score breakdown — buyers 50, who 15, size 18, conviction 10, offering penalty 0. The stock has moved -29.3% since the first buy in the window.
Second on the list, DICK'S SPORTING GOODS, INC. (DKS): 6 buyers, $5.1M, score 91. Third, Camp4 Therapeutics Corp (CAMP) with 5 buyers and $5.0M.
Every cluster, every buyer, on the chart
The members Cluster Buys page lists every window since 2024 with the buyers, the score breakdown and the price chart, filterable by buyer count, role and recency. Email alerts fire the morning a new cluster scores 55 or more.
See the clustersFree sampleQuestions this post answers
What is an insider cluster buy?
Three or more insiders buying the same company's stock on the open market within a window of no more than 60 days. It is the strongest single pattern in insider filings, because several people with inside knowledge independently decided the price was wrong at the same time.
Which stocks had the strongest insider cluster buying recently?
Top by score in the last 45 days: CDNL (7 buyers, $8.5M), DKS (6 buyers, $5.1M), CAMP (5 buyers, $5.0M), GME (4 buyers, $48.5M), AMRZ (11 buyers, $2.6M).
How is the cluster score calculated?
Out of 100: up to 50 for the number of buyers, up to 15 for who they are (officers and directors over funds), up to 25 for dollar size relative to the company, up to 10 for conviction signals such as buying a dip or a first-ever purchase, with a penalty when the buying is tied to an offering or placement.
Do cluster buys predict returns?
In the historical event study, purchases that were part of a cluster ran ahead of single purchases on a market-adjusted basis over the following quarter, in both the pre-2022 and holdout years. It is an average tilt with wide dispersion, not a forecast for any one stock.