11 insiders reported 27 Form 4 transactions for GERDAU S.A. (GGB) over the past 18 months (most recent 2026-09-21). Recent activity: Lopes Rafael Gamboa (Insider) Sell 51,800 shares, 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. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-21 | Lopes Rafael Gamboa | Insider | Sell | 51,800 | $263,662 |
| 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 | Metz Mauricio | Insider | Sell | 7,000 | $33,950 |
| 2026-06-03 | Wang Chia Yuan | Insider | Sell | 30,935 | $138,898 |
| 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 | Sell | 432,854 | $2.1M |
| 2026-05-12 | Da Cunha Gustavo Werneck | CEO and Board Member | Buy | 432,774 | $0 |
| 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 | Metz Mauricio | Insider | Sell | 1,000 | $4,530 |
| 2026-04-30 | Wang Chia Yuan | Insider | Sell | 76,700 | $344,383 |
| 2026-04-30 | Uhlein Clemir | Insider | Sell | 38,276 | $172,625 |
| 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 | 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 |
| 2026-04-10 | Wang Chia Yuan | Insider | Sell | 34,000 | $136,000 |
来源：SEC Form 4 申报文件 · 截至 2026-09-21