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Insider Trading Weekly: The Biggest Buys And Sells
Who bought and who sold shares in their own company last week, ranked by dollar value. This edition is built from the raw Form 4 filings themselves: every Form 4 filed with the Securities and Exchange Commission between 31 August and 4 September 2026 was downloaded from the daily index and read in XML, with no screener anywhere in the path.
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The week at a glance
Across the five sessions, 6,385 Form 4 filings produced 181 filings containing an open-market purchase and 824 containing a sale, once every transaction had been reduced to the ones actually executed: code P for purchases and code S for sales, with everything else left out. Purchases totalled $348.0 million across 127 tickers. Sales totalled $1,826.9 million across 509 tickers. In value terms insiders sold 5.2 dollars for every dollar they bought, and the breadth gap is wider than the value gap: four times as many companies saw a sale as saw a purchase.
The concentration on the buy side is extreme. Two filings by Cascade Investment, the vehicle co-filed with William H. Gates III, account for 79% of the entire top twenty purchases: $185.9 million of Republic Services across three sessions. Strip those two rows out and the remaining eighteen largest purchases of the week come to $49.4 million in total, which is less than the single largest sale by a factor of eight.
On the sell side, ten of the twenty largest lines were executed under a Rule 10b5-1 trading plan, and the filings state adoption dates running from 13 June 2025 to 22 May 2026. That matters for how the week reads: half of the biggest sales were scheduled before the events of this quarter existed.
$235.4M
Top 20 buys, verified
$185.9M
Cascade at Republic Services
$1074.2M
Top 20 sells, verified
5.2x
Sells over buys, all filings
10
Top-20 sales under a 10b5-1 plan
6,385
Form 4 read in full
Methodology. No screener was used, at any stage. The list of filings comes from the SEC EDGAR daily index for 31 August, 1, 2, 3 and 4 September 2026; every entry of form type 4 was downloaded and its ownership XML parsed directly. Only non-derivative transactions with code P or code S and a stated price are retained, and only those whose transaction date falls inside the week. Form 144 notices are not Form 4 filings and never enter. The same accession filed under several filer directories is counted once, and identical lots reported by affiliated co-filers are collapsed into a single row with all filers named. Multiple lots inside one filing are aggregated and the price shown is the value-weighted average of those lots. Values are recomputed as shares multiplied by the price reported on the form. A sale can reflect taxes, diversification, a plan adopted months earlier or a fund’s life cycle; it does not by itself express a view on the company, and nothing on this page is a recommendation.
Top 20 insider buys of the week
Ranked by verified dollar value. Where a filing contains several lots, the price is the value-weighted average and the filing itself states the range. The context column is the part that a table of numbers cannot carry: the security type, the ownership structure and whether the purchase happened on the open market at all.
| # | Ticker | Company | Insider | Role | Dates | Price | Shares | Value | Filing context | Source |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | $RSG | REPUBLIC SERVICES, INC. | CASCADE INVESTMENT, L.L.C. / GATES WILLIAM H III | 10% Owner | Sep 1-2 | $223.04 | 534,000 | $119,104,891 | Two Form 4 filings in the week, co-filed by Cascade Investment and William H. Gates III. One lot, not two: counted once. | Form 4 |
| 2 | $RSG | REPUBLIC SERVICES, INC. | CASCADE INVESTMENT, L.L.C. / GATES WILLIAM H III | 10% Owner | Aug 31 | $221.94 | 301,000 | $66,803,529 | Second filing of the same programme, on 31 August, at a weighted average of $221.94. | Form 4 |
| 3 | $LILA | Liberty Latin America Ltd. | DE ANGOITIA ALFONSO | Director | Aug 31, Sep 1, Sep 2 | $20.95 | 476,190 | $9,978,488 | Series A Preference Shares, not the common stock, held through Grenadeir S.A. A screener that files this under the common ticker is describing a different security. | Form 4 |
| 4 | $GPI | GROUP 1 AUTOMOTIVE INC | Conifer Management, L.L.C. | 10% Owner | Sep 1-2 | $275.28 | 30,100 | $8,285,850 | Open-market purchase by a 10% owner over two sessions. | Form 4 |
| 5 | $AON | Aon plc | KNIGHT LESTER B | Director | Sep 2 | $327.48 | 20,000 | $6,549,688 | Single-session purchase by a director. | Form 4 |
| 6 | $SUJA | SUJA LIFE, INC. | PAINE SCHWARTZ FOOD CHAIN FUND V GP, LTD. | 10% Owner | Aug 31, Sep 1, Sep 2 | $10.27 | 525,000 | $5,390,000 | Weighted average across three days; the filing states ranges from $9.65 to $10.62. Purchases made by PSP Suja Life Aggregator. | Form 4 |
| 7 | $AAT | American Assets Trust, Inc. | RADY ERNEST S | Director, Executive Chairman, 10% Owner | Aug 31, Sep 1, Sep 2 | $22.45 | 166,636 | $3,740,910 | Executive Chairman and 10% owner, three consecutive sessions. | Form 4 |
| 8 | $EMPD | Empery Digital Inc. | Empery Asset Management, LP / Lane Ryan M. | 10% Owner | Sep 1 | $3.59 | 500,000 | $1,793,100 | Fund and its managing member co-filed the same lot; prices from $3.19 to $3.77. | Form 4 |
| 9 | $PAM | Pampa Energy Inc. | Mindlin Marcos Marcelo | Director, 10% Owner | Aug 31 | $3.44 | 500,000 | $1,720,000 | Director and 10% owner of an Argentine issuer listed in the United States as an ADR. | Form 4 |
| 10 | $NPB | NORTHPOINTE BANCSHARES INC | Williams Charles Alan / Charles A Williams TR Charles A Williams Trust | Director, CHAIRMAN & CEO, 10% Owner | Sep 1 | $16.74 | 85,000 | $1,422,926 | Chairman and chief executive, purchase held through a trust in his name. | Form 4 |
| 11 | $TENX | TENAX THERAPEUTICS, INC. | ADAR1 Capital Management, LLC / Schneeberger Daniel | 10% Owner | Aug 31, Sep 1, Sep 2 | $1.79 | 770,333 | $1,381,750 | Weighted average from $1.77 to $1.80 over three sessions, by funds managed by ADAR1 Capital Management; the manager and its sole member co-filed. | Form 4 |
| 12 | $AMRZ | Amrize Ltd | Jenisch Jan Philipp | Director, Chairman & CEO | Sep 2 | $42.47 | 30,000 | $1,274,080 | Chairman and chief executive, single session. | Form 4 |
| 13 | $VSTS | Vestis Corp | Barber James J. | Director, President & CEO | Sep 2 | $12.37 | 84,500 | $1,045,383 | President and chief executive, single session. | Form 4 |
| 14 | $ITT | ITT INC. | Savi Luca | Director, President and CEO | Aug 31 | $199.56 | 5,019 | $1,001,592 | President and chief executive; the lot is sized to a round dollar amount rather than a round share count. | Form 4 |
| 15 | $MSCI | MSCI Inc. | Taneja Rajat | Director | Sep 2 | $560.00 | 1,786 | $1,000,160 | Director, at a flat $560.00 for a total of $1,000,160. Same pattern: a dollar target, not a share target. | Form 4 |
| 16 | $ATRA | Atara Biotherapeutics, Inc. | Cherry Brian N | Director | Sep 4 | $9.60 | 104,166 | $999,994 | Purchased from the issuer through its sales agent under a sales agreement dated 1 November 2023. This is a subscription to the company’s own programme, not a purchase from another holder on the open market. | Form 4 |
| 17 | $DFIN | Donnelley Financial Solutions, Inc. | BINZ JOSEPH LEO | Director | Sep 1-2 | $48.12 | 20,780 | $999,990 | Director, two sessions, total of $999,990. | Form 4 |
| 18 | $HONA | Honeywell Aerospace Inc. | ARNOLD CRAIG | Director | Sep 1 | $156.00 | 6,400 | $998,400 | Director of the aerospace entity, at a flat $156.00. | Form 4 |
| 19 | $AXIA3 | AXIA Energia S.A. | Batista de Lima Filho Pedro | Director | Aug 31 | $10.27 | 93,600 | $961,272 | Director of a Brazilian energy issuer. | Form 4 |
| 20 | $VST | Vistra Corp. | BURKE JAMES A | Director, President and CEO | Aug 31, Sep 1 | $135.49 | 6,665 | $903,069 | President and chief executive, two sessions. | Form 4 |
Top 20 insider sells of the week
Ranked by verified dollar value. The Rule 10b5-1 label appears only where the filing carries the flag or a footnote naming the plan, and where the adoption date is stated it is given in the context column.
| # | Ticker | Company | Insider | Role | Dates | Price | Shares | Value | Filing context | Source |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | $NVDA | NVIDIA CORP | STEVENS MARK A | Director | Aug 31, Sep 1, Sep 2 | $222.26 | 1,848,501 | $410,843,671 | Three sessions, the largest single line of the week by a wide margin. No Rule 10b5-1 flag on this filing. | Form 4 |
| 2 | $TPC | TUTOR PERINI CORP | TUTOR RONALD N | Director, Executive Chairman | Aug 31 | $85.59 | 2,310,000 | $197,709,600 | Executive chairman, a single block of 2.31 million shares. | Form 4 |
| 3 | $ILMN | ILLUMINA, INC. | Meister Keith A. | Director | Sep 2-3-4 | $217.03 | 263,560 | $57,199,201 | Director, three consecutive sessions; the same filer had sold in the second half of August as well. | Form 4 |
| 4 | $ALAB | Astera Labs, Inc. | ALBA MANUEL | Director | Sep 1 | $280.13 | 183,000 | $51,263,695 | Rule 10b5-1 plan adopted 22 May 2026. 10b5-1 | Form 4 |
| 5 | $ESTC | Elastic N.V. | Banon Shay | Director, Chief Technology Officer | Aug 31, Sep 1, Sep 2 | $93.41 | 476,298 | $44,492,543 | Chief technology officer and director, three sessions. No plan flag on this filing. | Form 4 |
| 6 | $MSFT | MICROSOFT CORP | Nadella Satya | Director, Chief Executive Officer | Sep 1 | $501.46 | 86,525 | $43,388,532 | Chief executive; the filing carries the Rule 10b5-1 checkbox without a footnote giving the adoption date. 10b5-1 | Form 4 |
| 7 | $ACT | Enact Holdings, Inc. | Genworth Holdings, Inc. | 10% Owner | Aug 31 | $49.40 | 687,379 | $33,953,773 | The seller is the parent company reducing its stake in the subsidiary, not an individual. | Form 4 |
| 8 | $POST | Post Holdings, Inc. | STIRITZ WILLIAM P | Chairman Emeritus | Sep 1-2 | $84.06 | 384,132 | $32,289,106 | Chairman emeritus, two sessions. | Form 4 |
| 9 | $CRWV | CoreWeave, Inc. | Intrator Michael N | Director, CEO and President, 10% Owner | Sep 1 | $81.66 | 307,692 | $25,127,375 | Chief executive; plan adopted 20 November 2025. 10b5-1 | Form 4 |
| 10 | $STX | Seagate Technology Holdings plc | MOSLEY WILLIAM D | Director, CEO | Sep 1 | $816.28 | 30,000 | $24,488,282 | Chief executive; plan adopted 18 February 2026. 10b5-1 | Form 4 |
| 11 | $SNPS | SYNOPSYS INC | DE GEUS AART | Director, EXECUTIVE CHAIR | Aug 31, Sep 1 | $430.68 | 49,641 | $21,379,539 | Executive chair; plan adopted 14 October 2025, nearly eleven months before the sale. 10b5-1 | Form 4 |
| 12 | $LAUR | LAUREATE EDUCATION, INC. | Snow Ian Kendell / Snow Phipps Group (RPV), L.P. / Snow Phipps Group (Offshore), L.P. / SPG Co-Investment, L.P. / Snow Phipps Group (B), L.P. / Snow Phipps Group, L.P. / Snow Phipps Group, LLC | Director, 10% Owner | Aug 31, Sep 1, Sep 2 | $36.65 | 521,229 | $19,102,658 | Seven affiliated entities filed the same lots. Counted once; a screener that adds every copy multiplies this line. | Form 4 |
| 13 | $WDAY | Workday, Inc. | DUFFIELD DAVID A | 10% Owner | Sep 1 | $199.29 | 94,961 | $18,924,544 | 10% owner; plan adopted by the trust on 2 December 2025. 10b5-1 | Form 4 |
| 14 | $LRCX | LAM RESEARCH CORP | Varadarajan Seshasayee | Senior Vice President | Sep 2 | $291.32 | 59,750 | $17,406,370 | Senior vice president; plan adopted 4 May 2026. 10b5-1 | Form 4 |
| 15 | $CAI | Caris Life Sciences, Inc. | Spetzler David Baxley | President | Sep 3-4 | $24.84 | 597,212 | $14,834,107 | President, two sessions at the end of the week. No plan flag. | Form 4 |
| 16 | $OKTA | Okta, Inc. | Tighe Brett | Chief Financial Officer | Sep 2 | $160.97 | 80,000 | $12,877,469 | Chief financial officer; plan adopted 8 April 2026. 10b5-1 | Form 4 |
| 17 | $CRWV | CoreWeave, Inc. | McVeety Kristen J | GC and Secretary | Sep 1 | $81.63 | 156,000 | $12,734,129 | General counsel, same session as the chief executive; separate plan adopted 13 May 2026. 10b5-1 | Form 4 |
| 18 | $BILL | BILL Holdings, Inc. | Lacerte Rene A. | Director, CEO | Sep 2-3 | $48.71 | 257,243 | $12,529,255 | The checkbox on the form is not ticked, but the footnote states a Rule 10b5-1 plan adopted 3 June 2026. The discrepancy is the filer’s and is reported as it stands. 10b5-1 | Form 4 |
| 19 | $DDOG | Datadog, Inc. | Le-Quoc Alexis | Director, Chief Technology Officer | Sep 1 | $227.02 | 53,912 | $12,238,927 | Chief technology officer and director; plan dated 13 June 2025. 10b5-1 | Form 4 |
| 20 | $RVMD | Revolution Medicines, Inc. | Kim Lorence H. | Director | Aug 31 | $203.24 | 56,000 | $11,381,288 | Director; plan adopted by his revocable trust on 1 June 2026, three months before the FDA approved the company’s first product on 26 August. 10b5-1 | Form 4 |
Nine corrections and interpretation traps
This is the part of the page that justifies reading the filings instead of a list. Each item below is a place where the raw number and the real transaction differ, and every one of them was found this week.
1. The same lot filed by several people
Republic Services was reported by Cascade Investment and by William H. Gates III on the same document; Laureate Education was reported by seven affiliated Snow Phipps entities at once; Tenax, Empery Digital and Suja Life each had a fund and its manager on the same lot. Counting every copy would have multiplied those rows by two, by seven and by two. They are counted once here, with every filer named.
2. A preference share is not the common stock
The third-largest purchase of the week, $9.98 million of Liberty Latin America by director Alfonso de Angoitia, is in Series A Preference Shares held through Grenadeir S.A. In the same week John C. Malone bought Class A common shares of the same issuer at a weighted average of $8.50. Two different securities, two different prices, one ticker.
3. A fixed price for several insiders is usually a placement
Four Quoin Pharmaceuticals insiders reported purchases at exactly $4.88 on 31 August. The footnotes say what it was: a private placement of American Depositary Shares with 50% warrant coverage, at a combined purchase price for the share and the warrant together. Each ADS represents thirty-five ordinary shares. None of that survives a summary that prints the word “buy” next to a price.
4. Employee share purchase plans are code P too
Six Wix.com executives, including the chief executive, the president and the chief financial officer, all reported purchases at exactly $59.89 on 31 August. The footnote states they were acquired under the company’s employee share purchase plan. The total across all six is $185,719, and none of it is a discretionary decision to buy that day.
5. So are dividend reinvestment plans
Two UMB Financial directors reported purchases at exactly $139.60 on 1 September. The filings say the shares include participation in the company’s dividend reinvestment plan. Same code, entirely different act.
6. Buying from the company is not buying on the market
Atara Biotherapeutics director Brian N. Cherry bought $999,994 of stock on 4 September. The footnote states the shares were purchased from the issuer, through its sales agent, under a sales agreement dated 1 November 2023. That is a subscription into the company’s own at-the-market programme, which puts the money into the company rather than taking shares from another holder. It is still an insider buying, and it is a different transaction.
7. A correction of an earlier error inflates the lot
The Sol-Gel Technologies filing by Opaleye Management carries a remark: of the shares reported, 10,000 correct an erroneous sale on 28 August and the rest are new acquisitions. The gross figure therefore overstates new buying, and only the filing says so.
8. A sale after good news can predate the news by months
Revolution Medicines director Lorence H. Kim sold $11.4 million on 31 August, five days after the FDA approved the company’s first product. The footnote states the plan was adopted by his revocable trust on 1 June 2026. The sequence looks like a reaction and the document says it was scheduled three months earlier.
9. Not everything with a ticker trades on an exchange
Two of the largest purchase filings of the week, $99.4 million in AMG Pantheon Infrastructure Fund and $1.0 million in PIMCO Flexible Credit Income Fund, are in non-traded interval funds. They are genuine Form 4 filings and they are not buyable on an exchange, so they are excluded from the ranking above and named here instead.
What the buyers actually bought
Set aside the two Cascade filings and the week’s purchases were small, numerous and concentrated in companies whose share price has already fallen a long way. Seventeen companies saw more than one insider buy. Three of those clusters are worth naming.
Enovis $399,591 across two insiders
Chief executive Damien McDonald bought 13,035 shares at $19.15 on 4 September and chief administrative officer Oliver Engert bought 7,598 shares over 2 and 3 September. The shares closed the week 25.46% lower than the previous Friday and at their lowest level of 2026.
What to check next: whether the buying continues in the following week’s filings, which is the only part of this that is verifiable rather than interpretive.
EquipmentShare.com $880,880 across three filings
Founder and chief executive Jabbok Schlacks bought on 31 August and again on 1 and 2 September, and founder and president William J. Schlacks bought on 2 September. All four lots are open-market purchases at prices between $17.29 and $17.79.
What to check next: the company listed recently, so the comparison that matters is against the lock-up and registration terms in its own filings.
United States Antimony $200,285 across three directors
Directors Joseph A. Carrabba and Lloyd Bardswich bought on 1 September at $4.72 and $4.63, and director Blaise A. Aguirre on 31 August at $5.04. The stock ended the week 58.8% below its 2026 high, in a week when the rare earths and strategic metals tracker fell 2.27%.
What to check next: the company sits in the critical-minerals theme that Merlintrader follows in the Energy, Minerals and Rare Earths index.
A pattern that runs through the smaller purchases is worth stating because it is easy to miss: several of the largest individual buys of the week are sized to a round dollar amount rather than a round number of shares. ITT bought $1,001,592, MSCI $1,000,160, Atara $999,994, Donnelley Financial $999,990 and Honeywell Aerospace $998,400. Five separate people at five separate companies decided to commit about one million dollars, and the share counts are whatever that amount happened to buy.
What the sellers were doing
The twenty largest sales come to $1074.2M, against $235.4M of purchases. Half of them ran on a pre-existing plan, and the adoption dates in the filings span more than eleven months: 13 June 2025 for Datadog, 14 October 2025 for Synopsys, 20 November 2025 and 13 May 2026 for the two CoreWeave officers, 2 December 2025 for the Workday trust, 18 February 2026 for Seagate, 8 April 2026 for Okta, 4 May 2026 for Lam Research, 22 May 2026 for Astera Labs and 1 June 2026 for the Revolution Medicines trust.
The two largest lines carry no plan flag at all. Mark A. Stevens, a director of NVIDIA, sold 1,848,501 shares over three sessions for $410.8 million, which is more than the entire top twenty purchases put together. Ronald N. Tutor, executive chairman of Tutor Perini, sold a single block of 2,310,000 shares for $197.7 million. Both are disclosed exactly as the form requires and neither carries an interpretation on this page.
One line is a company rather than a person. Genworth Holdings sold $34.0 million of Enact Holdings, its own listed subsidiary. That is a parent reducing a stake, and reading it as an executive selling personal shares would be wrong.
And one filing contradicts itself. The BILL Holdings Form 4 does not have the Rule 10b5-1 box ticked, while its footnote states the sale was effected under a plan adopted on 3 June 2026. The two statements are in the same document. The discrepancy belongs to the filer, and it is reported here as it stands rather than resolved in one direction.
Sources
Primary evidence, and the only evidence used: the SEC EDGAR daily index for 31 August through 4 September 2026, and the 6,385 Form 4 filings it lists, each downloaded and parsed from its own ownership XML. Every ranked row links to the filing it came from. Share prices used for context come from the Marketstack end-of-day series. Figures are a point-in-time reading as of 5 September 2026: late filings and amendments can change a later edition. Where a transaction could not be resolved from the filing itself, it was excluded rather than estimated.
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Join @merlintraderpub_com on TelegramDisclaimer. This page is published for educational and informational purposes only. It is not investment advice, a recommendation, or an offer or solicitation to buy or sell any security. Merlintrader is not a registered investment adviser or broker-dealer. Insider transactions are public records and are described here without implying a view on any security. Past performance does not indicate future results. Securities can be volatile and involve loss of principal. Do your own research and consult a licensed financial adviser before making an investment decision. Full disclaimer: merlintrader.com/disclaimer.