NYSE · CIK 0001073404
GGB GERDAU S.A.
Insider trading from SEC Form 4. Last filing 18 d ago. Close $5.12 on Oct 9, 2026, +66% from the 52-week low and -1% from the high.
In brief
GERDAU S.A. (GGB) has 28 SEC Form 4 filings on file from 12 insiders, the latest filed on Sep 25, 2026. In the last 90 days insiders made 0 open-market buys worth $0 and 5 open-market sells worth $1.3M, net -$1.3M.
27 open-market trades have been scored at GGB. The newest: Claudio Johannpeter sold $423k of stock on Sep 23, 2026, filed Sep 25, 2026, scored 52 (moderate). The largest of the 27 shown: Gustavo Werneck Da Cunha (CEO and Board Member) sold $2.1M on May 8, 2026, scored 85 (strong). 2 insiders sold within 14 days of each other around Sep 23, 2026.
Last 90 days
Price and insider trades, last year
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
Open-market buys and sells at GERDAU S.A., scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 52Moderate | Claudio Johannpeter other sell | $423k 85,607 shares | -100% | - | |
| 39Weak | Rafael Gamboa Lopes other sell | $264k 51,800 shares | -38% | - | |
| 50Moderate | Marcos Zilles Mattiello other sell | $53k 10,387 shares | -100% | +64% from low-7% from high | |
| 44Moderate | Andre Bier Gerdau Johannpeter other sell | $490k 99,200 shares | -29% | +74% from low-4% from high | |
| 28Weak | Rafael Dorneles Japur other sell | $51k 10,000 shares | -10% | +79% from low-2% from high | |
| 55Moderate | Gustavo Werneck Da Cunha CEO and Board Member buy | $782k 165,224 shares | - | +71% from low-3% from high | |
| 54Moderate | Chia Yuan Wang other sell | $139k 30,935 shares | -100% | +79% from low-0% from high | |
| 34Weak | Mauricio Metz other sell | $34k 7,000 shares | -24% | +79% from low-0% from high | |
| 28Weak | Mauricio Metz other sell | $24k 5,000 shares | -14% | +82% from low-4% from high | |
| 23Weak | Rafael Dorneles Japur other sell | $24k 5,000 shares | -5% | +84% from low-3% from high | |
| 56Moderate | Cesar Obino da Rosa Peres Officer sell | $37k 8,000 shares | -100% | +77% from low-7% from high | |
| 28Weak | Mauricio Metz other sell | $24k 5,000 shares | -13% | +80% from low-5% from high | |
| 85Strong | Gustavo Werneck Da Cunha CEO and Board Member sell | $2.1M 432,854 shares | -100% | +90% from low-2% from high | |
| 23Weak | Mauricio Metz other sell | $9,380 2,000 shares | -5% | +95% from low0% from high | |
| 55Moderate | Chia Yuan Wang other sell | $190k 40,000 shares | -55% | +95% from low0% from high | |
| 76Notable | Gustavo Werneck Da Cunha CEO and Board Member sell | $396k 88,000 shares | -100% | +83% from low-1% from high | |
| 37Weak | Chia Yuan Wang other sell | $91k 20,000 shares | -22% | +86% from low0% from high | |
| 54Moderate | Clemir Uhlein other sell | $173k 38,276 shares | -100% | +83% from low-1% from high | |
| 48Moderate | Chia Yuan Wang other sell | $344k 76,700 shares | -45% | +83% from low-1% from high | |
| 23Weak | Mauricio Metz other sell | $4,530 1,000 shares | -2% | +83% from low-1% from high | |
| 38Weak | Chia Yuan Wang other sell | $105k 25,000 shares | -13% | +78% from low-7% from high | |
| 23Weak | Mauricio Metz other sell | $4,240 1,000 shares | -2% | +78% from low-7% from high | |
| 50Moderate | Marcos Eduardo Faraco Wahrhaftig other sell | $50k 12,419 shares | -100% | +76% from low-8% from high | |
| 76Notable | Gustavo Werneck Da Cunha CEO and Board Member sell | $409k 100,000 shares | -53% | +76% from low-13% from high | |
| 39Weak | Chia Yuan Wang other sell | $136k 34,000 shares | -15% | +76% from low-13% from high | |
| 42Moderate | Guilherme Chagas Gerdau Johannpeter other sell | $282k 85,607 shares | -100% | +45% from low-28% from high | |
| 42Moderate | Guilherme Chagas Gerdau Johannpeter other sell | $282k 85,607 shares | -100% | +45% from low-28% from high |
Transactions
Every row filed, 30 in all.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 23, 2026 | Claudio Johannpeter other | SOpen-market sale Preferred shares | -85,607 | $4.94 | $423k | 0 | 18 d ago |
| Sep 17, 2026 | Rafael Gamboa Lopes other | SOpen-market sale Preferred shares | -51,800 | $5.09 | $264k | 83,399 | 22 d ago |
| Jul 15, 2026 | Marcos Eduardo Faraco Wahrhaftig other | AGrant or award Restricted Stock Unitsderivative | +107,749 | $3.75 | $404k | 107,749 | Aug 27, 2026 |
| Jun 8, 2026 | Marcos Zilles Mattiello other | SOpen-market sale Preferred shares | -10,387 | $5.11 | $53k | 0 | Aug 14, 2026 |
| Aug 10, 2026 | Andre Bier Gerdau Johannpeter other | SOpen-market sale Preferred shares | -99,200 | $4.94 | $490k | 247,380 | Aug 12, 2026 |
| Aug 6, 2026 | Rafael Dorneles Japur other | SOpen-market sale Preferred shares | -10,000 | $5.10 | $51k | 86,967 | Aug 10, 2026 |
| Jun 12, 2026 | Gustavo Werneck Da Cunha CEO and Board Member | POpen-market purchase Preferred shares | +165,224 | $4.73 | $782k | 165,224 | Jun 15, 2026 |
| Jun 2, 2026 | Mauricio Metz other | SOpen-market sale Preferred shares | -7,000 | $4.85 | $34k | 22,536 | Jun 3, 2026 |
| Jun 2, 2026 | Chia Yuan Wang other | SOpen-market sale Preferred shares | -30,935 | $4.49 | $139k | 0 | Jun 3, 2026 |
| May 26, 2026 | Mauricio Metz other | SOpen-market sale Preferred shares | -5,000 | $4.70 | $24k | 29,536 | May 28, 2026 |
| May 22, 2026 | Rafael Dorneles Japur other | SOpen-market sale Preferred shares | -5,000 | $4.75 | $24k | 96,967 | May 26, 2026 |
| May 19, 2026 | Cesar Obino da Rosa Peres Officer | SOpen-market sale Preferred shares | -8,000 | $4.60 | $37k | 8 | May 22, 2026 |
| May 13, 2026 | Mauricio Metz other | SOpen-market sale Preferred shares | -5,000 | $4.85 | $24k | 34,536 | May 15, 2026 |
| May 8, 2026 | Gustavo Werneck Da Cunha CEO and Board Member | AGrant or award Preferred shares | +432,774 | $0.00 | $0 | 432,854 | May 12, 2026 |
| May 8, 2026 | Gustavo Werneck Da Cunha CEO and Board Member | SOpen-market sale Preferred shares | -432,854 | $4.87 | $2.1M | 0 | May 12, 2026 |
| May 5, 2026 | Mauricio Metz other | SOpen-market sale Preferred shares | -2,000 | $4.69 | $9,380 | 39,536 | May 8, 2026 |
| May 5, 2026 | Chia Yuan Wang other | SOpen-market sale Preferred shares | -40,000 | $4.75 | $190k | 32,195 | May 7, 2026 |
| Apr 28, 2026 | Gustavo Werneck Da Cunha CEO and Board Member | SOpen-market sale Preferred shares | -88,000 | $4.50 | $396k | 80 | May 5, 2026 |
| Apr 30, 2026 | Chia Yuan Wang other | SOpen-market sale Preferred shares | -20,000 | $4.54 | $91k | 72,195 | May 4, 2026 |
| Apr 28, 2026 | Clemir Uhlein other | SOpen-market sale Preferred shares | -38,276 | $4.51 | $173k | 0 | Apr 30, 2026 |
| Apr 28, 2026 | Chia Yuan Wang other | SOpen-market sale Preferred shares | -76,700 | $4.49 | $344k | 92,195 | Apr 30, 2026 |
| Apr 28, 2026 | Mauricio Metz other | SOpen-market sale Preferred shares | -1,000 | $4.53 | $4,530 | 41,536 | Apr 30, 2026 |
| Apr 10, 2026 | Chia Yuan Wang other | SOpen-market sale Preferred shares | -25,000 | $4.21 | $105k | 168,895 | Apr 14, 2026 |
| Apr 10, 2026 | Mauricio Metz other | SOpen-market sale Preferred shares | -1,000 | $4.24 | $4,240 | 42,536 | Apr 14, 2026 |
| Apr 9, 2026 | Marcos Eduardo Faraco Wahrhaftig other | SOpen-market sale Preferred shares | -12,419 | $4.06 | $50k | 0 | Apr 13, 2026 |
| Apr 8, 2026 | Gustavo Werneck Da Cunha CEO and Board Member | SOpen-market sale Preferred shares | -50,000 | $4.01 | $201k | 138,080 | Apr 10, 2026 |
| Apr 8, 2026 | Chia Yuan Wang other | SOpen-market sale Preferred shares | -34,000 | $4.00 | $136k | 193,895 | Apr 10, 2026 |
| Apr 9, 2026 | Gustavo Werneck Da Cunha CEO and Board Member | SOpen-market sale Preferred shares | -50,000 | $4.16 | $208k | 88,080 | Apr 10, 2026 |
| Mar 20, 2026 | Guilherme Chagas Gerdau Johannpeter other | SOpen-market sale Preferred shares | -85,607 | $3.29 | $282k | 0 | Mar 25, 2026 |
| Mar 20, 2026 | Guilherme Chagas Gerdau Johannpeter other | SOpen-market sale Preferred shares | -85,607 | $3.29 | $282k | 0 | Mar 24, 2026 |
Insiders
Everyone who has filed a Form 4 here.
- Gustavo Werneck Da CunhaCEO and Board Member
- Rafael Dorneles Japurother
- Andre Bier Gerdau Johannpeterother
- Claudio Johannpeterother
- Guilherme Chagas Gerdau Johannpeterother
- Rafael Gamboa Lopesother
- Marcos Zilles Mattielloother
- Mauricio Metzother
- Cesar Obino da Rosa PeresOfficer
- Clemir Uhleinother
- Marcos Eduardo Faraco Wahrhaftigother
- Chia Yuan Wangother
Questions about GGB
Answered from the filings on this page, as of the latest one.
Are insiders buying GGB?
As of Sep 25, 2026, SEC Form 4 filings show 0 open-market buys worth $0 by 0 insiders and 5 open-market sells worth $1.3M by 5 insiders at GERDAU S.A. in the last 90 days, net -$1.3M. Only purchases (code P) and sales (code S) count; grants, option exercises and tax withholding do not.
Who was the last insider to trade GGB on the open market?
Claudio Johannpeter sold $423k of GGB on Sep 23, 2026 and filed the Form 4 on Sep 25, 2026. InsiderTell scored 52 (moderate), with 2 insiders on the same side within 14 days.
How many insiders file Form 4 at GERDAU S.A.?
12 people have filed a Form 4 at GERDAU S.A., among them Gustavo Werneck Da Cunha (CEO and Board Member), Rafael Dorneles Japur (insider), Andre Bier Gerdau Johannpeter (insider). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.