PortPurchases by US Company CEOs and Boards
The largest purchases of company stock by CEOs, directors, and major shareholders in the US from SEC Form 4 filings — and companies where multiple insiders are buying.
Largest US Insider Buys (last 90 days)
Open market stock purchases (code P in Form 4) — excluding options and compensation awards. An insider who spends their own money speaks louder than one who sells.
Companies with multiple insider buys
Multiple board members buying at the same time is one of the strongest signals from insider transactions in research.
| Company | Insiders buying | Total |
|---|---|---|
| Taiwan Semiconductor Manufacturing (TSM) | 30 | $1.4M |
| Bank Bradesco (BBD) | 22 | $99.3M |
| Columbia Financial (CLBK) | 16 | $4.8M |
| Amrize (AMRZ) | 11 | $2.6M |
| Simon Property (SPG) | 11 | 461k $ |
| Braveheart Bio (BRVE) | 10 | $159M |
| Riverview Bancorp (RVSB) | 9 | 84k $ |
| Star Bulk Carriers (SBLK) | 8 | $6.9M |
| Fuller H B (FUL) | 8 | $1.1M |
| Cardinal Infrastructure (CDNL) | 7 | $8.5M |
| Chemours (CC) | 7 | 489k $ |
| Mid Penn Bancorp (MPB) | 7 | 35k $ |
| York Water (YORW) | 7 | 14k $ |
| Scribe Therapeutics (SCTX) | 6 | $71.3M |
| Attovia Therapeutics (ATTO) | 6 | $52.4M |
Frequently Asked Questions
What is Form 4?
A form used by a US company insider to report a transaction in its shares to the SEC — within two business days, including the number of shares and price.
Is a CEO buying shares a good sign?
It is often perceived that way — an insider sells for many reasons (taxes, a house), but usually buys for only one. This is still not a recommendation.
Other rankings
Insider faces on every company chart
In Portevo, every transaction on this list is shown on the share price chart on the purchase date — with a photo or the person's role. Follow whoever you want and get notifications.
Portevo is not an investment advisor. The data and analyses are for informational and educational purposes only and do not constitute a recommendation or an offer to buy or sell financial instruments. Quotes are from external providers and may be delayed. You make investment decisions at your own risk.
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