Biggest Insider Buys: August 2025
The largest open-market insider purchases disclosed in SEC Form 4 filings, ranked by dollar value.
In August 2025, 6 open-market insider purchases of $50K or more were disclosed across 3 companies in SEC Form 4 filings, totaling $1.2M. The largest single purchase was $501K by Johnston Ian A at Amrize Ltd (AMRZ).
← All monthly rankingsLargest purchases · August 2025
| Source | |||||||
|---|---|---|---|---|---|---|---|
| AMRZ | Chief Financial Officer | Purchase | 10,500 | $501K | Aug 11 | SEC ↗ | |
| AMRZ | Chief People Officer | Purchase | 5,000 | $259K | Aug 18 | SEC ↗ | |
| LUMN | EVP and CFO | Purchase | 30,000 | $129K | Aug 15 | SEC ↗ | |
| LUMN | EVP and CFO | Purchase | 28,500 | $127K | Aug 15 | SEC ↗ | |
| PKOH | CEO, COB, President | Purchase | 4,167 | $84K | Aug 14 | SEC ↗ | |
| PKOH | CEO, COB, President | Purchase | 4,101 | $82K | Aug 14 | SEC ↗ |