Insider Trading Report: August 2026
Every open-market purchase and sale company insiders reported on Form 4 in August 2026: 1,662 purchases worth $1.95B and 5,298 sales worth $21.5B.
Biggest purchases
| Filed | Ticker | Insider | Type | Value | Score |
|---|---|---|---|---|---|
| Aug 27 | MAIR | Ernesto Bertarelli10% owner | ▲ BUY | $219.0M | 62 |
| Aug 26 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $67.2M | 25 |
| Aug 28 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $62.5M | 25 |
| Aug 28 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $61.0M | 25 |
| Aug 26 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $59.8M | 25 |
| Aug 4 | APCX | Albert L. LordDirector | ▲ BUY | $58.0M | 29 |
| Aug 4 | APCX | Albert L. LordDirector | ▲ BUY | $57.9M | 29 |
| Aug 12 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $56.2M | 25 |
| Aug 12 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $51.9M | 25 |
| Aug 18 | MPLT | Catalyst4, Inc.10% owner | ▲ BUY | $50.1M | 47 |
| Aug 24 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $46.0M | 25 |
| Aug 18 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $44.4M | 25 |
| Aug 20 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $43.6M | 25 |
| Aug 24 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $42.2M | 25 |
| Aug 14 | RSG | Cascade Investment, LLC10% owner | ▲ BUY | $40.7M | 25 |
Cluster buys
Three or more different insiders buying the same stock in the month.
- TSM TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD · 30 insiders
- AMRZ Amrize Ltd · 10 insiders
- BRVE Braveheart Bio, Inc. · 10 insiders
- FOCL EDAP TMS SA · 8 insiders
- CDNL Cardinal Infrastructure Group Inc. · 7 insiders
- CC Chemours Co · 7 insiders
- CODI Compass Diversified Holdings · 6 insiders
- ACON Aclarion, Inc. · 6 insiders
- ATTO Attovia Therapeutics, Inc. · 6 insiders
- PNAQ Pinnacle Acquisition Corp · 6 insiders
Biggest sales
| Filed | Ticker | Insider | Type | Value |
|---|---|---|---|---|
| Aug 17 | BIRK | James Michael ChuDirector | ▼ SELL | $1.10B |
| Aug 4 | JMKE | Blackstone Holdings II L.P.10% owner | ▼ SELL | $648.8M |
| Aug 4 | JMKE | Submarine Buyer LLC10% owner | ▼ SELL | $648.8M |
| Aug 24 | ALH | Bdt Capital Partners, LLCDirector | ▼ SELL | $589.6M |
| Aug 10 | PRMB | Tony W. LeeDirector | ▼ SELL | $497.4M |
| Aug 10 | PRMB | Orcp III De Topco Gp, LLC10% owner | ▼ SELL | $497.4M |
| Aug 12 | CRBG | Argon Holdco LLC10% owner | ▼ SELL | $491.1M |
| Aug 19 | AUR | Uber Technologies, Inc10% owner | ▼ SELL | $471.6M |
| Aug 5 | AMZN | Jeffrey P. BezosExecutive Chair | ▼ SELL10b5-1 | $346.5M |
| Aug 14 | FA | Slta V (gp), LLCDirector | ▼ SELL | $275.2M |
By sector
| Sector | Bought | Sold |
|---|---|---|
| Utilities | $716.4M | $130.7M |
| Health Care | $335.5M | $2.49B |
| Technology | $136.9M | $4.75B |
| Industrials | $83.6M | $2.40B |
| Consumer Discretionary | $43.8M | $5.01B |
| Financials | $40.3M | $2.03B |
| Materials | $27.1M | $1.54B |
| Communication Services | $24.8M | $170.4M |
| Real Estate | $23.7M | $87.1M |
| Energy | $18.0M | $637.3M |
| Consumer Staples | $12.0M | $1.11B |
Examples
- The largest purchase of the month: Ernesto Bertarelli (10% owner) bought $219.0M of Madison Air Solutions Corp.
- At TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD, 30 different insiders bought shares in the same month.
About this page
WallStPal explains public SEC filings and congressional stock trade reports in plain English. Nothing is for sale; the site is free and supported by ads.
How to read it
- Form 4
- The form a company insider (officer, director or owner of more than 10%) must file with the SEC within two business days of buying or selling the company's shares.
- 13F
- A quarterly list of U.S. stocks held by an investment manager with more than $100 million, filed within 45 days after each quarter ends.
- STOCK Act
- A 2012 law that requires members of Congress to report stock trades by themselves, a spouse or a dependent child within 45 days.
A real example
In January 2016, when bank stocks were falling, JPMorgan Chase CEO Jamie Dimon bought 500,000 JPMorgan shares with his own money, worth about $26 million. His Form 4 made the purchase public within days, and investors read it as a strong sign of confidence.
Explain it like I'm 13
We read the long, boring forms that grown-ups file with the government and tell you what they say in normal words.
Data from public SEC filings and congressional reports. Information, not investment advice. Check every number against the filing linked on the page.