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Insider trading, one day at a time

Every morning: the largest open-market insider purchases filed with the SEC the day before, charted. Through the week: sentiment, cluster buys, a Trader Atlas profile, seasonal windows, a chart-pattern study, the weekly recap and a stock of the week. All of it generated from the same data the members area runs on, updated through 2026-10-14.

Guides to the members tools

Guide
The Filings Browser
Type a ticker and see every insider buy and sell of the last two years marked on the price chart, with the…
Guide
Cluster buys
One insider buying can mean anything. Three insiders independently buying the same stock in the same few…
Guide
The Trader Atlas
Pick an insider. See every open-market buy they have filed, plotted against the share price on the day the…
Guide
The Backtest engine
Buy when a CFO buys at least $100k as part of a cluster, hold for a quarter. Does it work? The Backtest…
Guide
Seasonal stock patterns that survived an out-of-sample test
Every seasonality tool can show you a stock that rose every October. So can a coin, flipped often enough.…
Guide
Chart formations
Every occurrence of sixteen classic chart patterns across 8,067 US stocks and up to 32 years of history —…
Guide
Email alerts
Get one email the morning after a filing you care about lands. The alerts check the new filings and clusters…
Guide
The JSON API
The same buys, sells and clusters the members pages show, as JSON you can pull into a notebook, a sheet or…
Guide
The Formations ThinkScript study for ThinkorSwim
The full five-signal version of our ThinkorSwim study plots every formation that survived testing in both…
Guide
How to read an SEC Form 4, and which transactions actually matter
Insider filings are the most direct disclosure there is of what the people running a company are doing with…
Trader Atlas spotlight: RA Capital Nexus Fund, L.P. — 21 insider buys, 52% beat the market
RA Capital Nexus Fund, L.P.'s open-market insider purchases from SEC Form 4: 21 buys across 9 tickers since 2020, median excess return +2.6% over the next 63 trading days vs SPY, $537.3M bought in total.
Trader Atlas · Wednesday, October 14, 2026
Insider buying report — Tuesday, October 13, 2026: 44 open-market buys worth $55.0M
Every open-market insider purchase filed with the SEC on Oct 13, 2026: 44 buys worth $55.0M across 35 companies, plus 27 insider sales of $1M or more ($776.6M). Largest: Cohen Ryan at GME, $22.8M.
Daily report · Wednesday, October 14, 2026
Cluster buys: 94 stocks where three or more insiders bought together in the last six weeks
94 insider buying clusters ended in the last 45 days. Top score: GameStop Corp. (GME), 5 buyers, $76.4M, score 100/100. Ranked list with buyer counts, dollar totals and price move since the cluster.
Cluster buys · Tuesday, October 13, 2026
Insider sentiment, week of Oct 5, 2026: 22% of insider filings were buys
Market-wide insider buying vs selling for the week starting Oct 5, 2026: 166 open-market buys, 597 sales, a 22% buy share against a 52-week average of 25%. Charted from SEC Form 4 filings.
Sentiment · Monday, October 12, 2026
Stock of the week: TSM — 30 insiders bought Taiwan Semiconductor Manufacturing Co Lt this week
TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD (TSM) had the most distinct insider buyers of any US stock in the week to Oct 9, 2026: 30 insiders, $121k. Two-year record: 227 open-market buys, 1 $1M+ sales. Filings, roles and the price chart.
Stock of the week · Sunday, October 11, 2026
Insider trading this week, Oct 3, 2026 – Oct 9, 2026: 156 buys, $461.3M
Week in insider filings: 156 open-market purchases worth $461.3M across 78 companies, 132 sales of $1M+ worth $2.50B. Biggest buy: Berkshire Hathaway Inc at LEN, $192.6M. Most buyers: TSM (30).
Weekly recap · Saturday, October 10, 2026
Insider buying report — Friday, October 9, 2026: 31 open-market buys worth $106.5M
Every open-market insider purchase filed with the SEC on Oct 9, 2026: 31 buys worth $106.5M across 26 companies, plus 18 insider sales of $1M or more ($96.1M). Largest: Yin Chung-Yao at GGR, $35.1M.
Daily report · Saturday, October 10, 2026
Does the 'Death cross' chart pattern work? 49,646 occurrences say: no reliable signal
We measured every 'Death cross' across 8,057 US stocks since 1994: 49,646 occurrences. Market-adjusted return over the next 21 trading days: -0.27% before 2018, -0.68% since. Verdict: no reliable signal.
Formations · Friday, October 9, 2026
Insider buying report — Thursday, October 8, 2026: 51 open-market buys worth $45.6M
Every open-market insider purchase filed with the SEC on Oct 8, 2026: 51 buys worth $45.6M across 19 companies, plus 22 insider sales of $1M or more ($337.6M). Largest: Huang Jack Jiajia at COE, $32.3M.
Daily report · Friday, October 9, 2026
Seasonal windows opening in the next 21 days: 53 patterns that held up out of sample
53 seasonal stock patterns start between Oct 8, 2026 and Oct 29, 2026, each found on pre-2018 data and repeated in at least 75% of the years since. Strongest: Mettler Toledo International Inc/ (MTD), up in 25 of 28 years from Oct 28, 2026.
Seasonal · Thursday, October 8, 2026
Insider buying report — Wednesday, October 7, 2026: 18 open-market buys worth $11.3M
Every open-market insider purchase filed with the SEC on Oct 7, 2026: 18 buys worth $11.3M across 14 companies, plus 30 insider sales of $1M or more ($235.9M). Largest: Troim Tor Olav at BORR, $6.4M.
Daily report · Thursday, October 8, 2026
Trader Atlas spotlight: 667, L.P. — 47 insider buys, 64% beat the market
667, L.P.'s open-market insider purchases from SEC Form 4: 47 buys across 12 tickers since 2019, median excess return +8.1% over the next 63 trading days vs SPY, $1.47B bought in total.
Trader Atlas · Wednesday, October 7, 2026
Insider buying report — Tuesday, October 6, 2026: 17 open-market buys worth $45.0M
Every open-market insider purchase filed with the SEC on Oct 6, 2026: 17 buys worth $45.0M across 16 companies, plus 14 insider sales of $1M or more ($1.01B). Largest: Ryan Israel at PSUS, $9.6M.
Daily report · Wednesday, October 7, 2026
Cluster buys: 102 stocks where three or more insiders bought together in the last six weeks
102 insider buying clusters ended in the last 45 days. Top score: GameStop Corp. (GME), 5 buyers, $76.4M, score 100/100. Ranked list with buyer counts, dollar totals and price move since the cluster.
Cluster buys · Tuesday, October 6, 2026
Insider buying report — Monday, October 5, 2026: 39 open-market buys worth $252.8M
Every open-market insider purchase filed with the SEC on Oct 5, 2026: 39 buys worth $252.8M across 31 companies, plus 48 insider sales of $1M or more ($821.5M). Largest: Berkshire Hathaway Inc at LEN, $192.6M.
Daily report · Tuesday, October 6, 2026
Insider sentiment, week of Sep 28, 2026: 38% of insider filings were buys
Market-wide insider buying vs selling for the week starting Sep 28, 2026: 264 open-market buys, 422 sales, a 38% buy share against a 52-week average of 25%. Charted from SEC Form 4 filings.
Sentiment · Monday, October 5, 2026
Stock of the week: SPG — 11 insiders bought Simon Property Group Inc. this week
SIMON PROPERTY GROUP INC. (SPG) had the most distinct insider buyers of any US stock in the week to Oct 2, 2026: 11 insiders, $461k. Two-year record: 98 open-market buys, 1 $1M+ sales. Filings, roles and the price chart.
Stock of the week · Sunday, October 4, 2026
Insider trading this week, Sep 26, 2026 – Oct 2, 2026: 240 buys, $577.1M
Week in insider filings: 240 open-market purchases worth $577.1M across 133 companies, 121 sales of $1M+ worth $1.18B. Biggest buy: Conifer Management, L.L.C. at GPI, $66.3M. Most buyers: SPG (11).
Weekly recap · Saturday, October 3, 2026
Insider buying report — Friday, October 2, 2026: 41 open-market buys worth $49.0M
Every open-market insider purchase filed with the SEC on Oct 2, 2026: 41 buys worth $49.0M across 31 companies, plus 44 insider sales of $1M or more ($244.0M). Largest: Cohen Ryan at GME, $17.1M.
Daily report · Saturday, October 3, 2026
Does the 'Golden cross' chart pattern work? 47,655 occurrences say: no reliable signal
We measured every 'Golden cross' across 8,043 US stocks since 1994: 47,655 occurrences. Market-adjusted return over the next 21 trading days: -0.08% before 2018, -1.21% since. Verdict: no reliable signal.
Formations · Friday, October 2, 2026
Insider buying report — Thursday, October 1, 2026: 64 open-market buys worth $31.6M
Every open-market insider purchase filed with the SEC on Oct 1, 2026: 64 buys worth $31.6M across 43 companies, plus 20 insider sales of $1M or more ($159.5M). Largest: Life Insurance Co Nippon at CRBG, $7.3M.
Daily report · Friday, October 2, 2026
Seasonal windows opening in the next 21 days: 17 patterns that held up out of sample
17 seasonal stock patterns start between Oct 1, 2026 and Oct 22, 2026, each found on pre-2018 data and repeated in at least 75% of the years since. Strongest: Mitek Systems Inc (MITK), up in 28 of 34 years from Sep 8, 2026.
Seasonal · Thursday, October 1, 2026
Insider buying report — Wednesday, September 30, 2026: 55 open-market buys worth $353.9M
Every open-market insider purchase filed with the SEC on Sep 30, 2026: 55 buys worth $353.9M across 41 companies, plus 21 insider sales of $1M or more ($231.0M). Largest: Conifer Management, L.L.C. at GPI, $66.3M.
Daily report · Thursday, October 1, 2026
Trader Atlas spotlight: Baker Bros. Advisors (GP) LLC — 55 insider buys, 66% beat the market
Baker Bros. Advisors (GP) LLC's open-market insider purchases from SEC Form 4: 55 buys across 16 tickers since 2019, median excess return +9.4% over the next 63 trading days vs SPY, $1.51B bought in total.
Trader Atlas · Wednesday, September 30, 2026
Insider buying report — Tuesday, September 29, 2026: 36 open-market buys worth $93.0M
Every open-market insider purchase filed with the SEC on Sep 29, 2026: 36 buys worth $93.0M across 32 companies, plus 17 insider sales of $1M or more ($161.0M). Largest: George Simeon at ADRX, $27.2M.
Daily report · Wednesday, September 30, 2026
Cluster buys: 99 stocks where three or more insiders bought together in the last six weeks
99 insider buying clusters ended in the last 45 days. Top score: Cardinal Infrastructure Group Inc. (CDNL), 7 buyers, $8.5M, score 93/100. Ranked list with buyer counts, dollar totals and price move since the cluster.
Cluster buys · Tuesday, September 29, 2026
Insider buying report — Monday, September 28, 2026: 44 open-market buys worth $49.6M
Every open-market insider purchase filed with the SEC on Sep 28, 2026: 44 buys worth $49.6M across 36 companies, plus 19 insider sales of $1M or more ($384.5M). Largest: Conifer Management, L.L.C. at GPI, $31.5M.
Daily report · Tuesday, September 29, 2026
Insider sentiment, week of Sep 21, 2026: 33% of insider filings were buys
Market-wide insider buying vs selling for the week starting Sep 21, 2026: 227 open-market buys, 457 sales, a 33% buy share against a 52-week average of 25%. Charted from SEC Form 4 filings.
Sentiment · Monday, September 28, 2026
Stock of the week: BBD — 21 insiders bought Bank Bradesco this week
BANK BRADESCO (BBD) had the most distinct insider buyers of any US stock in the week to Sep 25, 2026: 21 insiders, $27.0M. Two-year record: 23 open-market buys, 2 $1M+ sales. Filings, roles and the price chart.
Stock of the week · Sunday, September 27, 2026
Insider trading this week, Sep 19, 2026 – Sep 25, 2026: 206 buys, $652.8M
Week in insider filings: 206 open-market purchases worth $652.8M across 134 companies, 138 sales of $1M+ worth $2.04B. Biggest buy: Berkshire Hathaway Inc at LEN, LEN.B, $212.4M. Most buyers: BBD (21).
Weekly recap · Saturday, September 26, 2026
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Subscribe by RSS. Built from SEC EDGAR ownership filings. Only open-market purchases (transaction code P) and sales of $1M or more are counted; grants, option exercises and tax withholding are excluded because they run on schedules set years earlier. Historical description, not a prediction, and not investment advice.