Comparable stake leader
FMR LLC
SEC ownership of GERDAU S.A.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001073404.
Disclosed value leader
ACADIAN ASSET MANAGEMENT LLC
Comparable rows
1/50
Latest evidence
30 Jun 2026
- Public ticker
- GGB on NYSE
- Parsed ownership sources
-
13F and 13D/G
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
FMR LLC
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
1 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
FMR LLC
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001073404
- Issuer location
- Sao Paulo, Sp
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of GERDAU S.A. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
FMR LLC
Disclosed value leader
ACADIAN ASSET MANAGEMENT LLC
Comparable rows
1/50
Latest evidence
30 Jun 2026
13F
13D/G
Lead comparable stake: 0.2%
49 rows are not safely comparable across share classes.
13D/G row: FMR LLC
Showing 1-8 of 50 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 0.2%.
1 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens FMR LLC's linked filing trail.
Comparable ownership
Top 1
FMR LLC
0.2%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| FMR LLC |
13F
13D/G
Company
|
0.2%
from 13D/G
|
$41,986,131
10,392,607 shares
|
— | 30 Jun 2026 |
| ACADIAN ASSET MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$196,602,000
48,672,737 shares
|
— | 30 Jun 2026 |
| Capital World Investors |
13F
Company
|
—
class O/S missing
|
$108,685,991
26,902,473 shares
|
— | 30 Jun 2026 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC |
13F
Company
|
—
class O/S missing
|
$104,010,677
25,745,217 shares
|
— | 30 Jun 2026 |
| CONTRARIAN CAPITAL MANAGEMENT, L.L.C. |
13F
Company
|
—
class O/S missing
|
$77,039,212
19,069,112 shares
|
— | 30 Jun 2026 |
| BlackRock, Inc. |
13F
Company
|
—
class O/S missing
|
$73,630,628
18,225,403 shares
|
— | 30 Jun 2026 |
| DONALD SMITH & CO., INC. |
13F
Company
|
—
class O/S missing
|
$70,662,872
17,490,810 shares
|
— | 30 Jun 2026 |
| Aquamarine Financial (Cayman) Ltd |
13F
Company
|
—
class O/S missing
|
$67,573,731
16,726,171 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$4,395,540.
Buys
$781,510
Insiders: 1
Sells
$5,177,049
Insiders: 10
Net
-$4,395,540
Shares: -972,154
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 165,224
Shares: 1,137,378
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 165,224 | 162,522 | $781,510 | $790,474 | -$8,965 |
| 3-6 | 0 | 974,856 | $0 | $4,386,575 | -$4,386,575 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-19 of 19 reporting-owner rows connected to GERDAU S.A.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
19
Largest Forms 3/4/5 holder
Andre Bier Gerdau Johannpeter
Net 12M change
-$4,395,539
Latest report
10 Aug 2026
Recent insider transactions for GERDAU S.A.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Andre Bier Gerdau Johannpeter | GGB | Preferred shares | Sale | -28.6% | $490,048 | $4.94 | -99,200 | 247,380 | 10 Aug 2026 | Direct |
| Rafael Dorneles Japur | GGB | Preferred shares | Sale | -10.3% | $51,000 | $5.10 | -10,000 | 86,967 | 06 Aug 2026 | Direct |
| Gustavo Werneck da Cunha | GGB | Preferred shares | Purchase | $781,510 | $4.73 | 165,224 | 165,224 | 12 Jun 2026 | Direct | |
| Marcos Zilles Mattiello | GGB | Preferred shares | Sale | -100% | $53,078 | $5.11 | -10,387 | 0 | 08 Jun 2026 | Direct |
| Chia Yuan Wang | GGB | Preferred shares | Sale | -100% | $138,898 | $4.49 | -30,935 | 0 | 02 Jun 2026 | Direct |
| Mauricio Metz | GGB | Preferred shares | Sale | -23.7% | $33,950 | $4.85 | -7,000 | 22,536 | 02 Jun 2026 | Direct |
| Mauricio Metz | GGB | Preferred shares | Sale | -14.5% | $23,500 | $4.70 | -5,000 | 29,536 | 26 May 2026 | Direct |
| Rafael Dorneles Japur | GGB | Preferred shares | Sale | -4.9% | $23,750 | $4.75 | -5,000 | 96,967 | 22 May 2026 | Direct |
| Cesar Obino da Rosa Peres | GGB | Preferred shares | Sale | -99.9% | $36,800 | $4.60 | -8,000 | 8 | 19 May 2026 | Direct |
| Mauricio Metz | GGB | Preferred shares | Sale | -12.6% | $24,250 | $4.85 | -5,000 | 34,536 | 13 May 2026 | Direct |
| Gustavo Werneck da Cunha | GGB | Preferred shares | Sale | -100% | $2,107,999 | $4.87 | -432,854 | 0 | 08 May 2026 | Direct |
| Gustavo Werneck da Cunha | GGB | Preferred shares | Award | 540967.5% | 432,774 | 432,854 | 08 May 2026 | Direct | ||
| Mauricio Metz | GGB | Preferred shares | Sale | -4.82% | $9,380 | $4.69 | -2,000 | 39,536 | 05 May 2026 | Direct |
| Chia Yuan Wang | GGB | Preferred shares | Sale | -55.4% | $190,000 | $4.75 | -40,000 | 32,195 | 05 May 2026 | Direct |
| Chia Yuan Wang | GGB | Preferred shares | Sale | -21.7% | $90,800 | $4.54 | -20,000 | 72,195 | 30 Apr 2026 | Direct |
| Gustavo Werneck da Cunha | GGB | Preferred shares | Sale | -99.9% | $396,000 | $4.50 | -88,000 | 80 | 28 Apr 2026 | Direct |
| Chia Yuan Wang | GGB | Preferred shares | Sale | -45.4% | $344,383 | $4.49 | -76,700 | 92,195 | 28 Apr 2026 | Direct |
| Clemir Uhlein | GGB | Preferred shares | Sale | -100% | $172,625 | $4.51 | -38,276 | 0 | 28 Apr 2026 | Direct |
| Mauricio Metz | GGB | Preferred shares | Sale | -2.35% | $4,530 | $4.53 | -1,000 | 41,536 | 28 Apr 2026 | Direct |
| Mauricio Metz | GGB | Preferred shares | Sale | -2.3% | $4,240 | $4.24 | -1,000 | 42,536 | 10 Apr 2026 | Direct |
| Chia Yuan Wang | GGB | Preferred shares | Sale | -12.9% | $105,250 | $4.21 | -25,000 | 168,895 | 10 Apr 2026 | Direct |
| Marcos Eduardo Faraco Wahrhaftig | GGB | Preferred shares | Sale | -100% | $50,421 | $4.06 | -12,419 | 0 | 09 Apr 2026 | Direct |
| Gustavo Werneck da Cunha | GGB | Preferred shares | Sale | -36.2% | $208,000 | $4.16 | -50,000 | 88,080 | 09 Apr 2026 | Direct |
| Gustavo Werneck da Cunha | GGB | Preferred shares | Sale | -26.6% | $200,500 | $4.01 | -50,000 | 138,080 | 08 Apr 2026 | Direct |
| Chia Yuan Wang | GGB | Preferred shares | Sale | -14.9% | $136,000 | $4.00 | -34,000 | 193,895 | 08 Apr 2026 | Direct |
| Guilherme Chagas Gerdau Johannpeter | GGB | Preferred shares | Sale | -100% | $281,647 | $3.29 | -85,607 | 0 | 20 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.