Insider Cluster Buys
A cluster buy is when three or more insiders at one company – officers, directors or 10%+ owners – each buy at least $25,000 of its stock on the open market within 30 days. This page screens SEC Form 4 filings for them and leaves out small and plan-style purchases. Most months, few companies qualify.
SEC Form 4 filings as of Oct 23, 2026
Source: SEC EDGAR Form 4 filings · sec.gov/edgar. See our Methodology.
Cluster buys in the last 30 days
Sep 24 – Oct 24, 2026| Company | Insiders | Purchases | Total bought | Purchase dates |
|---|---|---|---|---|
| RAPPRapport Therapeutics, Inc. PAUL STEVEN M (Director) $974K · MARAGANORE JOHN (Director) $249K · Ignelzi Troy A. (Chief Financial Officer) $144K · +3 more | 6 | 7 | $1.7M | Oct 21 – Oct 23, 2026 |
| DXDYNEX CAPITAL INC Popenoe Smriti Laxman (Co-CEO and President) $157K · BOSTON BYRON L (Co-CEO & Chairman of the Board) $100K · Connelly Terrence John JR (Chief Investment Officer) $28K | 3 | 4 | $284K | Sep 25 – Oct 20, 2026 |
| FULFULLER H B CO BAILLY R JEFFREY (Director) $500K · FLORNESS DANIEL L (Director) $100K · Zaheer Srilata (Director) $100K · +5 more | 8 | 10 | $1.1M | Sep 28 – Oct 16, 2026 |
| BORRBorr Drilling Ltd Troim Tor Olav (Director) $48.0M · Snowling Harvey Edward (Chief Operating Officer) $1.5M · Morand De Oliveira Bruno (Chief Executive Officer) $200K | 3 | 11 | $49.7M | Sep 16 – Oct 15, 2026 |
| PAMPampa Energy Inc. Mindlin Marcos Marcelo (Director) $36.9M · Mindlin Damian Miguel (Vicepresident) $5.6M · Mariani Gustavo (Vicepresident) $2.0M | 3 | 5 | $44.4M | Aug 31 – Oct 15, 2026 |
| GMEGameStop Corp. Cohen Ryan (President, CEO and Chairman) $97.2M · Cheng Lawrence (Director) $1.0M · Attal Alain (Director) $502K · +2 more | 5 | 12 | $99.2M | Sep 8 – Oct 13, 2026 |
| PDIPIMCO Dynamic Income Fund FLATTUM DAVID C (Director) $250K · Morris Sonya (Director) $80K · Rappaport Alan (Director) $76K | 3 | 3 | $405K | Sep 22 – Oct 6, 2026 |
| DKSDICK'S SPORTING GOODS, INC. Barrenechea Mark J (Director) $2.2M · Gupta Navdeep (EVP, Chief Financial Officer) $1.0M · COLOMBO WILLIAM J (Director) $907K · +4 more | 7 | 9 | $5.6M | Aug 26 – Sep 30, 2026 |
| BBDBANK BRADESCO Alvarez Denise Aguiar (Director) $33.6M · Alvarez Rubens Aguiar (Director) $32.0M · Di Marcello Francesco (Executive Officer) $1.0M | 3 | 22 | $66.6M | Aug 31 – Sep 29, 2026 |
| INBXInhibrx Biosciences, Inc. Lappe Mark (Chief Executive Officer) $3.6M · Kayyem Jon Faiz (Director) $1.6M · FORSYTH DOUGLAS (Director) $287K | 3 | 14 | $5.5M | Sep 8 – Sep 28, 2026 |
Earlier cluster buys, past 12 months
31 eventsPast events, kept for reference with the dates of the purchases. None of these is current.
| Company | Insiders | Purchases | Total bought | Purchase dates |
|---|---|---|---|---|
| GAMGENERAL AMERICAN INVESTORS CO INC Stark Eugene S (VP Administration) $234K · DAVIDSON SPENCER (Insider) $228K · Priest Jeffrey W (President & CEO) $94K · +2 more | 5 | 7 | $672K | Sep 15 – Sep 23, 2026 |
| DYDYCOM INDUSTRIES INC Peyovich Daniel S (President & CEO) $252K · Fallon David Joseph (Director) $201K · Sabater Carmen M (Director) $98K | 3 | 3 | $551K | Sep 1 – Sep 23, 2026 |
| ADCAGREE REALTY CORP RAKOLTA JOHN JR (Director) $3.6M · Agree Joey (PRESIDENT & CEO) $501K · Erlich Craig (CHIEF GROWTH OFFICER) $68K | 3 | 6 | $4.1M | Aug 27 – Sep 21, 2026 |
| COOCOOPER COMPANIES, INC. Kurzius Lawrence Erik (Director) $1.1M · Rosebrough Walter M Jr (Director) $542K · Keel Paul A (Director) $250K | 3 | 5 | $1.9M | Sep 11 – Sep 16, 2026 |
| CELHCelsius Holdings, Inc. DeSantis Damon (Director) $1.0M · Fieldly John (Chief Executive Officer) $494K · Kravitz Hal (Director) $336K | 3 | 4 | $1.8M | Sep 10 – Sep 15, 2026 |
| LMBLimbach Holdings, Inc. Horowitz Joshua (Director) $391K · Gaboury David Richard (Director) $100K · Krzeminski Laurel J (Director) $25K | 3 | 7 | $516K | Sep 11 – Sep 15, 2026 |
| LUCKLucky Strike Entertainment Corp Young John Alan (Director) $634K · Shannon Thomas F. (Chief Executive Officer) $176K · MATHRANI SANDEEP (Director) $60K | 3 | 5 | $870K | Aug 28 – Sep 9, 2026 |
| EVLVEvolv Technologies Holdings, Inc. Shapiro Richard A (Director) $162K · Kuhl Henrik (Director) $86K · Glat Neil (Director) $49K | 3 | 6 | $296K | Aug 14 – Sep 4, 2026 |
| AMRZAmrize Ltd Jenisch Jan Philipp (Chairman & CEO) $1.3M · Oran Baris (Chief Financial Officer) $284K · Clark Stephen S (Chief People Officer) $249K · +7 more | 10 | 16 | $2.6M | Aug 11 – Sep 2, 2026 |
| LILALiberty Latin America Ltd. DE ANGOITIA ALFONSO (Director) $10.0M · MALONE JOHN C (10%+ Owner) $4.4M · BRACKEN CHARLES H R (Director) $365K | 3 | 13 | $14.8M | Aug 7 – Sep 2, 2026 |
| UAMYUNITED STATES ANTIMONY CORP Carrabba Joseph A (Director) $101K · EVANS GARY C (Chairman & CEO) $98K · Bardswich Lloyd (Dir, EVP & Chief Mining Eng) $93K | 3 | 3 | $292K | Aug 28 – Sep 1, 2026 |
| TNCTENNANT CO Mulligan Donal L (Director) $539K · ALLEN PATRICK E (Director) $208K · Morse Timothy R. (Director) $102K | 3 | 3 | $849K | Aug 12 – Aug 31, 2026 |
| AMRCAmeresco, Inc. Cox Brian C (Director) $1.1M · Sakellaris George P (Chief Executive Officer) $575K · Sutton Joseph W. (Director) $202K · +1 more | 4 | 13 | $1.9M | Aug 7 – Aug 28, 2026 |
| MTDRMatador Resources Co Foran Joseph Wm (Chairman and CEO) $1.0M · Calvert Christopher P (EVP and CFO) $142K · Elsener William Thomas (EVP, Reservoir Engineering) $43K | 3 | 8 | $1.2M | Aug 10 – Aug 27, 2026 |
| BSXBOSTON SCIENTIFIC CORP Mahoney Michael F (Chairman, President & CEO) $9.0M · LUDWIG EDWARD J (Director) $227K · Habiger David C (Director) $157K · +1 more | 4 | 6 | $9.5M | Jul 31 – Aug 25, 2026 |
| ACDCProFrac Holding Corp. Wilks Dan H. (10%+ Owner) $6.5M · THRC Holdings, LP (10%+ Owner) $2.9M · Wilks Matthew (Chief Executive Officer) $402K | 3 | 10 | $9.8M | Aug 10 – Aug 25, 2026 |
| ABCLAbCellera Biologics Inc. Hayden Michael R (Director) $1.1M · Booth Andrew (Chief Financial Officer) $384K · Montalbano John S. (Director) $110K | 3 | 4 | $1.5M | Aug 12 – Aug 24, 2026 |
| ELANElanco Animal Health Inc Kurzius Lawrence Erik (Director) $936K · Herendeen Paul (Director) $237K · Harrington Michael J (Director) $109K · +2 more | 5 | 5 | $1.5M | Aug 7 – Aug 20, 2026 |
| XRNChiron Real Estate Inc. Fitzgerald Charles (Director) $1.5M · Decker Mark Okey Jr (CEO and President) $554K · Roseth Aaron Robert (COO) $496K · +1 more | 4 | 8 | $2.6M | Aug 10 – Aug 17, 2026 |
| REZIRESIDEO TECHNOLOGIES, INC. Foster Joshua Peter (SVP, GC & Corp Sec) $315K · SURRAN THOMAS A (President and CEO) $307K · Mehta Amit Ashvin (SVP, Strategy & Business Ops) $226K | 3 | 3 | $848K | Aug 14 – Aug 17, 2026 |
| CECelanese Corp Kyrish Chuck (SVP & CFO) $105K · Murray Mark Christopher (SVP - Acetyls) $98K · Duffie Ashley B (SVP & GC) $27K | 3 | 5 | $230K | Aug 11 – Aug 14, 2026 |
| KMPRKEMPER Corp Gorevic Jason N (Director) $130K · LADERMAN GERALD (Director) $106K · McAnena Stephen J (President and CEO) $80K · +2 more | 5 | 5 | $368K | Aug 10 – Aug 13, 2026 |
| APTVAptiv PLC MEISTER PAUL M (Director) $5.0M · CLARK KEVIN P (Chair and CEO) $2.5M · Mahoney Sean O (Director) $553K · +1 more | 4 | 6 | $8.3M | Aug 5 – Aug 13, 2026 |
| CCChemours Co Cowan Alister (Director) $203K · CRANSTON MARY B (Director) $95K · Dignam Denise (Chief Executive Officer) $51K · +4 more | 7 | 7 | $489K | Aug 6 – Aug 12, 2026 |
| PFEPFIZER INC BOURLA ALBERT (Chairman & CEO) $1.0M · BLAYLOCK RONALD E (Director) $999K · Buckley Mortimer J (Director) $960K | 3 | 3 | $3.0M | Aug 5 – Aug 12, 2026 |
| HOGHARLEY-DAVIDSON, INC. NOVA DANIEL J (Director) $983K · Starrs Artie (President & CEO) $259K · Littleton Gayle (CLO, CCO, CAO & Corp Sec) $198K | 3 | 3 | $1.4M | Jul 31 – Aug 11, 2026 |
| TSCOTRACTOR SUPPLY CO /DE/ Lawton III Harry A (President & CEO) $502K · Hawaux Andre J (Director) $100K · MORRIS EDNA (Director) $51K | 3 | 4 | $652K | Aug 3 – Aug 4, 2026 |
| ACIAlbertsons Companies, Inc. Moriarty Thomas M (EVP, M&A and Corporate Affairs) $2.0M · MORRIS SUSAN (Chief Executive Officer) $450K · MCCOLLAM SHARON (President & CFO) $103K | 3 | 4 | $2.5M | Jul 27 – Jul 31, 2026 |
| NKENIKE, Inc. COOK TIMOTHY D (Director) $1.1M · Hill Elliott (PRESIDENT & CEO) $1.0M · SWAN ROBERT HOLMES (Director) $500K · +1 more | 4 | 4 | $2.7M | Apr 7 – Apr 13, 2026 |
| KKRKKR & Co. Inc. BARAKETT TIMOTHY R (Director) $4.7M · Cohler Matt (Director) $4.5M · BAE JOSEPH Y (Co-Chief Executive Officer) $4.4M · +2 more | 5 | 5 | $20.1M | Feb 17 – Mar 4, 2026 |
| GMEGameStop Corp. Cohen Ryan (President, CEO and Chairman) $21.4M · Attal Alain (Director) $510K · Cheng Lawrence (Director) $114K | 3 | 5 | $22.0M | Jan 20 – Jan 23, 2026 |
Net insider buying, last 90 days
Jul 26 – Oct 24, 2026Net insider selling, last 90 days
Jul 26 – Oct 24, 2026How the cluster screen works
Cluster buy: 3 or more distinct insiders (officers, directors or 10%+ owners), each reporting at least $25K of open-market purchases (Form 4 code P) within a rolling 30-day window. Overlapping windows for one company count as one event.
Plan-style purchases are excluded: when 3 or more insiders buy on the same day at an identical price, the purchases usually settle through an employee or director purchase plan rather than individual decisions. On Apr 9, 2026, for example, ten TSMC officers reported purchases at the same $57.87 per share, about $45,000 in total; the screen does not count that as a cluster. Purchases the filer marked as made under a Rule 10b5-1 trading plan (a Form 4 checkbox since April 2023) are excluded as well.
What's filtered out: derivative transactions, option exercises (code M), tax withholdings (code F), gifts (code G) and awards (code A). The net buying and selling tables count open-market purchases (P) and sales (S) of shares only. Every code is defined, with how often it appears, in our Form 4 transaction codes reference.
Timing:insiders must file Form 4 within two business days of a trade. Dates on this page are transaction dates; the as-of date above is the newest filing in AlphaScala's copy of the data.
What the research says
Cohen, Malloy and Pomorski (“Decoding Inside Information”, Journal of Finance, 2012; NBER working paper 16454) separate routine insiders, who traded in the same calendar month in each of the three prior years, from opportunistic ones. A portfolio of opportunistic trades earned value-weighted abnormal returns of about 82 basis points a month in their sample; routine trades carried essentially no information.
The study does not test cluster buys. The cluster screen here is a separate filter for several insiders buying at once. AlphaScala has not yet measured the returns that followed the clusters it lists, so treat them as a starting point for research, not as evidence of future returns.
Related data
- Hedge fund 13F holdings – what tracked funds reported at quarter end
- Congressional stock trades – STOCK Act disclosures by members of Congress
- Market signals – insider, 13F and Alpha Score signals on one board
- CFTC COT positioning – futures positioning by trader type
- Form 4 transaction codes – what P, S, M, F and the other SEC codes mean
Educational research only – not investment advice. Insider purchases have many motives and are not reliable predictors on their own. See our risk disclaimer.