10 insiders reported 26 Form 4 transactions for GERDAU S.A. (GGB) over the past 18 months (most recent 2026-08-14). Recent activity: Mattiello Marcos Zilles (Insider) Sell 10,387 shares, Johannpeter Andre Bier Gerdau (Insider) Sell 99,200 shares, Japur Rafael Dorneles (Insider) Sell 10,000 shares, Da Cunha Gustavo Werneck (CEO and Board Member) Buy 165,224 shares, Wang Chia Yuan (Insider) Sell 30,935 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-14 | Mattiello Marcos Zilles | Insider | Sell | 10,387 | $53,078 |
| 2026-08-12 | Johannpeter Andre Bier Gerdau | Insider | Sell | 99,200 | $490,048 |
| 2026-08-10 | Japur Rafael Dorneles | Insider | Sell | 10,000 | $51,000 |
| 2026-06-15 | Da Cunha Gustavo Werneck | CEO and Board Member | Buy | 165,224 | $781,510 |
| 2026-06-03 | Wang Chia Yuan | Insider | Sell | 30,935 | $138,898 |
| 2026-06-03 | Metz Mauricio | Insider | Sell | 7,000 | $33,950 |
| 2026-05-28 | Metz Mauricio | Insider | Sell | 5,000 | $23,500 |
| 2026-05-26 | Japur Rafael Dorneles | Insider | Sell | 5,000 | $23,750 |
| 2026-05-22 | Peres Cesar Obino da Rosa | Officer | Sell | 8,000 | $36,800 |
| 2026-05-15 | Metz Mauricio | Insider | Sell | 5,000 | $24,250 |
| 2026-05-12 | Da Cunha Gustavo Werneck | CEO and Board Member | Buy | 432,774 | $0 |
| 2026-05-12 | Da Cunha Gustavo Werneck | CEO and Board Member | Sell | 432,854 | $2.1M |
| 2026-05-08 | Metz Mauricio | Insider | Sell | 2,000 | $9,380 |
| 2026-05-07 | Wang Chia Yuan | Insider | Sell | 40,000 | $190,000 |
| 2026-05-05 | Da Cunha Gustavo Werneck | CEO and Board Member | Sell | 88,000 | $396,000 |
| 2026-05-04 | Wang Chia Yuan | Insider | Sell | 20,000 | $90,800 |
| 2026-04-30 | Uhlein Clemir | Insider | Sell | 38,276 | $172,625 |
| 2026-04-30 | Wang Chia Yuan | Insider | Sell | 76,700 | $344,383 |
| 2026-04-30 | Metz Mauricio | Insider | Sell | 1,000 | $4,530 |
| 2026-04-14 | Wang Chia Yuan | Insider | Sell | 25,000 | $105,250 |
| 2026-04-13 | Wahrhaftig Marcos Eduardo Faraco | Insider | Sell | 12,419 | $50,421 |
| 2026-04-10 | Wang Chia Yuan | Insider | Sell | 34,000 | $136,000 |
| 2026-04-10 | Da Cunha Gustavo Werneck | CEO and Board Member | Sell | 50,000 | $200,500 |
| 2026-04-10 | Da Cunha Gustavo Werneck | CEO and Board Member | Sell | 50,000 | $208,000 |
| 2026-03-25 | Johannpeter Guilherme Chagas Gerdau | Insider | Sell | 85,607 | $281,647 |
Source: SEC Form 4 filings · as of 2026-08-14