Insider Radar — Week of August 3, 2026
Form 4 volume nearly doubled to 1,473 filings in the week of August 3 as trading windows reopened after the July earnings wave, and insider selling climbed to $5.05 billion, the heaviest week since early June. Reported buying more than doubled to $269.4 million, but about 74% of it arrived at prices fixed in advance, led by a $159.0 million Braveheart Bio financing reported on Form 4. Strip the fixed-price money out and the conviction list is short, headed by Boston Scientific's chief executive paying $9.0 million on the open market. Scheduled plans did $2.13 billion of the selling, about 43% of open-market sales.
Insider selling hit $5.05 billion in the week of August 3, 2026, the heaviest weekly total in nine weeks, while reported buying more than doubled to $269.4 million. About three quarters of the buying came at prices fixed in advance, led by ten filers reporting Braveheart Bio at exactly $18.00 a share. The cleanest conviction signal: Boston Scientific's CEO paying $9.0 million on the open market.
Selling hit $5.05 billion, but the biggest blocks were exits, plans and a buyout
Insiders and large holders disposed of $5.05B across 1,254 events, up from $3.84B the week before and the heaviest weekly total since the week of June 1. Two caveats belong at the top. The single largest block, $497.4M of Primo Brands (PRMB) sold at $24.37 on August 7, appears twice in the raw filings: it is reported both by ORCP III DE TopCo GP, a One Rock Capital vehicle, and by director Tony Lee over the same shares. The same pattern repeats at LandBridge (LB), where a $93.8M sale the same day is co-filed by LandBridge Holdings and David Capobianco. Count each co-filed block once and the week is roughly $4.46B. A further $135.7M never reached the market at all: it is stock returned to issuers, most of it twelve Electronic Arts (EA) filings totalling $103.6M at a flat $210.00 a share, executives cashing out at the agreed take-private price rather than selling into the market.
Scheduled selling did $2.13B of the work, about 43% of open-market sales, and it covers the week's most recognisable names. Jeff Bezos sold $346.5M of Amazon (AMZN) at an average $286.41 on August 3 under a 10b5-1 plan. Arista Networks (ANET) chief executive Jayshree Ullal filed $221.2M across three filings and 75 small tranches, also scheduled. Airbnb (ABNB) co-founder Nathan Blecharczyk sold $92.6M and SharkNinja (SN) chief executive Mark Barrocas $88.8M, both under plans. None of these says anything about what the seller thinks this quarter; the plans were set months ago.
The discretionary sales are the ones worth reading, and two directors lead them. Keith Meister sold $148.2M of Illumina (ILMN) at an average $199.91 on August 5 across 14 tranches, with no plan flag on the filing. John Hess sold $137.9M of Chevron (CVX) at $194.10 on August 3, also unscheduled. At Chime (CHYM), DST Global Advisors reported $117.2M across two identical $58.6M filings on August 6, while the chief executive and a co-founder trimmed a combined $23.3M under plans, and GIC took $80.0M out of Medline (MDLN) the same day.
| Ticker | Seller | Role | Event value | Type | Date |
|---|---|---|---|---|---|
| PRMB | ORCP III DE TopCo GP / Tony Lee | 10% holder and director (co-filed, one block) | $497.4M | Open market | Aug 7 |
| AMZN | Jeffrey P. Bezos | Executive Chair | $346.5M | 10b5-1 | Aug 3 |
| ANET | Jayshree Ullal | CEO and Chairperson | $221.2M | 10b5-1, three filings | Aug 5 |
| ILMN | Keith A. Meister | Director | $148.2M | Open market | Aug 5 |
| CVX | John B. Hess | Director | $137.9M | Open market | Aug 3 |
| CHYM | DST Global Advisors Ltd | 10% holder | $117.2M | Open market, two filings | Aug 6 |
| LB | LandBridge Holdings / David Capobianco | 10% holders (co-filed, one block) | $93.8M | Open market | Aug 7 |
| ABNB | Nathan Blecharczyk | Chief Strategy Officer | $92.6M | 10b5-1 | Aug 7 |
| SN | Mark Barrocas | Chief Executive Officer | $88.8M | 10b5-1 | Aug 6 |
| MDLN | GIC Private Ltd | 10% holder | $80.0M | Open market | Aug 6 |
Buying more than doubled, but three quarters of it was priced in advance
Reported buying came to $269.4M across 247 events, up from $111.3M the week before. Most of the lift is one deal. Ten separate filers reported $159.0M of Braveheart Bio (BRVE) stock on August 7, every share at exactly $18.00: Forbion at $64.8M, OrbiMed at $34.9M (a block also reported by OrbiMed partner Erez Chimovits, so it appears twice in the raw total), AH Bio Fund IV at $19.8M, and the company's own chief executive Travis Murdoch and director Christopher Viehbacher at $1.5M each. A uniform price across separate filers on a single day is a financing round being reported on Form 4, not ten investors independently deciding the stock is cheap. Attovia Therapeutics (ATTO) shows the same shape, $31.8M at a flat $17.00 from Frazier Life Sciences, Redmile, venBio and Sanofi, as does Apnimed (APMD) at a flat $16.00, and Churchill Capital XIII (XIIIU) officer and director Michael Klein put $3.5M into his own vehicle at exactly $10.00. The fixed-price money comes to $199.5M, about 74% of the week's buying.
51Talk (COE) chief executive Jack Jiajia Huang extended his buying streak with $11.6M across August 3 to 5 at prices between $18.48 and $19.20, filed under a plan. What remains is the open-market conviction list, and it is headed by an unusually large name. Boston Scientific (BSX) chairman and chief executive Michael Mahoney paid $9.0M at $48.33 on August 3, and director David Habiger added $156.8K two days later, which puts the ticker's week at $9.2M. Aptiv (APTV) director Paul Meister bought $5.0M at $47.33, CoStar (CSGP) founder and chief executive Andrew Florance paid $2.5M at $29.89, Fortune Brands (FBIN) chief executive Jesse Singh bought $2.0M at $50.93 to $52.23, and directors at American Bitcoin (ABTC), Clarivate (CLVT) and TXO Partners (TXO) added between $1.4M and $1.9M each. Large-cap chief executives buying their own stock on the open market are rare enough that the Boston Scientific purchase is the week's cleanest single signal.
| Ticker | Buyer | Role | Event value | Price | Date |
|---|---|---|---|---|---|
| COE | Jack Jiajia Huang | Chief Executive Officer (10b5-1) | $11.6M | $18.48–$19.20 | Aug 3–5 |
| BSX | Michael Mahoney | Chairman, President & CEO | $9.0M | $48.33 | Aug 3 |
| APTV | Paul Meister | Director | $5.0M | $47.33 | Aug 5 |
| CSGP | Andrew Florance | Founder and CEO | $2.5M | $29.89 | Aug 4 |
| FBIN | Jesse Singh | Chief Executive Officer | $2.0M | $50.93–$52.23 | Aug 7 |
| ABTC | Justin Mateen | Director | $1.9M | $6.19–$6.40 | Aug 6 |
| CLVT | Kenneth Cornick | Director | $1.7M | $1.85–$1.86 | Aug 7 |
| TXO | Bob Simpson | Director and 10% holder | $1.4M | $13.52 | Aug 7 |
Methodology
Source data is public SEC Form 4 filings collected by AlphaAI, covering transactions dated August 3 through August 9, 2026. Transactions are grouped into events by filing, issuer and ownership form, so a sale executed in many tranches under one filing counts once rather than inflating the count. Event groups summing above $1 billion are excluded, because at that size the row is almost always a merger, tender or reorganisation rather than a discretionary trade. Purchases are P-code transactions, disposals are S and D codes, and the two are reported separately because a D code is stock returned to the issuer rather than sold into the market; this week the distinction matters, since the Electronic Arts rows are deal consideration at a fixed $210.00, not market sales. Where related filers co-file the same disposition (the Primo Brands block reported by both ORCP III DE TopCo GP and director Tony Lee, and the LandBridge block reported by LandBridge Holdings and David Capobianco), the duplicate is flagged in prose and the table rather than silently summed. Activity filed under 10b5-1 plans is split out, because those trades are scheduled months ahead and say nothing about what a seller thinks now. Roles come from the officer, director and 10 percent holder flags on the filing itself. Values are shares multiplied by the reported price, with no currency normalisation, so filings by foreign issuers priced in a local currency are screened out of the tables by hand. The recent median sell to buy ratio covers the twenty-six preceding weeks, each with more than $10 million of reported buying. Prior-week comparisons are recomputed from the current database, which keeps accreting late filings, so they can differ slightly from figures as originally published (the prior issue's $107.9 million of buying now stands at $111.3 million). This is the first issue assembled entirely on the repaired collector shipped August 7, which captures filings live and reconciles nightly against SEC's daily indexes; the window was pulled on August 12, after the filing deadline for every transaction date in it had passed. This is a readout of public filings and not investment advice.
Sources: SEC EDGAR Form 4 filings
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