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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.

Insider buying report — Friday, September 25, 2026: 32 open-market buys worth $154.8M

Every open-market insider purchase filed with the SEC on Sep 25, 2026: 32 buys worth $154.8M across 29 companies, plus 17 insider sales of $1M or more ($457.1M). Largest: Berkshire Hathaway Inc at LEN, $136.4M.

Daily report · Saturday, September 26, 2026

Does the 'Overbought: RSI above 70' chart pattern work? 2,606,324 occurrences say: repeats, negative

We measured every 'Overbought: RSI above 70' across 8,029 US stocks since 1994: 2,606,324 occurrences. Market-adjusted return over the next 21 trading days: -0.09% before 2018, -1.26% since. Verdict: repeats, negative.

Formations · Friday, September 25, 2026

Insider buying report — Thursday, September 24, 2026: 30 open-market buys worth $27.7M

Every open-market insider purchase filed with the SEC on Sep 24, 2026: 30 buys worth $27.7M across 26 companies, plus 23 insider sales of $1M or more ($301.9M). Largest: Life Insurance Co Nippon at CRBG, $10.2M.

Daily report · Friday, September 25, 2026

Seasonal windows opening in the next 21 days: 15 patterns that held up out of sample

15 seasonal stock patterns start between Sep 24, 2026 and Oct 15, 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, September 24, 2026

Insider buying report — Wednesday, September 23, 2026: 39 open-market buys worth $75.1M

Every open-market insider purchase filed with the SEC on Sep 23, 2026: 39 buys worth $75.1M across 37 companies, plus 34 insider sales of $1M or more ($242.4M). Largest: Orbimed Advisors Llc at ETRA, $20.0M.

Daily report · Thursday, September 24, 2026

Trader Atlas spotlight: Biotechnology Value Trading Fund OS LP — 66 insider buys, 61% beat the market

Biotechnology Value Trading Fund OS LP's open-market insider purchases from SEC Form 4: 66 buys across 11 tickers since 2019, median excess return +10.3% over the next 63 trading days vs SPY, $321.3M bought in total.

Trader Atlas · Wednesday, September 23, 2026

Insider buying report — Tuesday, September 22, 2026: 60 open-market buys worth $26.2M

Every open-market insider purchase filed with the SEC on Sep 22, 2026: 60 buys worth $26.2M across 41 companies, plus 21 insider sales of $1M or more ($492.1M). Largest: Life Insurance Co Nippon at CRBG, $4.6M.

Daily report · Wednesday, September 23, 2026

Cluster buys: 110 stocks where three or more insiders bought together in the last six weeks

110 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 22, 2026

Insider buying report — Monday, September 21, 2026: 45 open-market buys worth $369.0M

Every open-market insider purchase filed with the SEC on Sep 21, 2026: 45 buys worth $369.0M across 37 companies, plus 43 insider sales of $1M or more ($545.7M). Largest: Berkshire Hathaway Inc at LEN, LEN.B, $212.4M.

Daily report · Tuesday, September 22, 2026

Insider sentiment, week of Sep 14, 2026: 26% of insider filings were buys

Market-wide insider buying vs selling for the week starting Sep 14, 2026: 317 open-market buys, 902 sales, a 26% buy share against a 52-week average of 24%. Charted from SEC Form 4 filings.

Sentiment · Monday, September 21, 2026

Stock of the week: SBLK — 8 insiders bought Star Bulk Carriers Corp. this week

Star Bulk Carriers Corp. (SBLK) had the most distinct insider buyers of any US stock in the week to Sep 18, 2026: 8 insiders, $6.9M. Two-year record: 8 open-market buys, 2 $1M+ sales. Filings, roles and the price chart.

Stock of the week · Sunday, September 20, 2026

Insider trading this week, Sep 12, 2026 – Sep 18, 2026: 307 buys, $547.6M

Week in insider filings: 307 open-market purchases worth $547.6M across 188 companies, 238 sales of $1M+ worth $6.85B. Biggest buy: Kolchinsky Peter at TYRA, $200.0M. Most buyers: SBLK (8).

Weekly recap · Saturday, September 19, 2026

Insider buying report — Friday, September 18, 2026: 36 open-market buys worth $21.6M

Every open-market insider purchase filed with the SEC on Sep 18, 2026: 36 buys worth $21.6M across 33 companies, plus 27 insider sales of $1M or more ($247.2M). Largest: Life Insurance Co Nippon at CRBG, $11.2M.

Daily report · Saturday, September 19, 2026

Insider buying report — Thursday, September 17, 2026: 67 open-market buys worth $234.4M

Every open-market insider purchase filed with the SEC on Sep 17, 2026: 67 buys worth $234.4M across 45 companies, plus 58 insider sales of $1M or more ($4.53B). Largest: Kolchinsky Peter at TYRA, $200.0M.

Daily report · Saturday, September 19, 2026

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.