Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

GERDAU S.A.

GGB · NYSE · CIK 0001073404 · Basic Materials · Steel

INSIDER SIGNAL

No active buy signal

1 qualifying P purchase group
in the current 180-day scoring window

21 Form 4 transaction lines observed in the same window
19 sales · 1 option, withholding, award, gift or other lines

Last qualifying purchase2026-06-12 · Da Cunha Gustavo Werneck · $781.5K

WHY NO ACTIVE SIGNAL?

Purchase activityPresent
Recent buying1 qualifying line group(s)
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Metz MauricioOther
▼▼▼▼▼
Da Cunha Gustavo WerneckCEO and Board Member
▼○▼●
Wang Chia YuanOther
▼▼▼▼
Japur Rafael DornelesOther
▼▼
Peres Cesar Obino da RosaOfficer
▼
Uhlein ClemirOther
▼
● Purchase▼ Sale○ Other

Showing the six most active owners; 4 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS1
PURCHASE CONCENTRATION100%Largest buyer: Da Cunha Gustavo Werneck · $781.5K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-06-12–2026-06-12

Roles in the peak window: CEO and Board Member. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2026-06-12 · Da Cunha Gustavo Werneck.

Recent Form 4 activity

1Purchases
27Sales
1Other Form 4 lines
27SEC filings · 365 days
BUYING1 qualifying P line(s) · 180 days
SELLING19 sale line(s) · context only
OTHER1 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
40,763,775
Previous report
43,249,432
Avg daily volume
11,325,463
Days to cover
3.6

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-06-12Da Cunha Gustavo WerneckPurchase (P)Preferred shares165,224USD 4.73USD 781,510SEC filing ↗

Form 4 evidence

29 transaction lines in the latest 365-day window; 29 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-23Johannpeter ClaudioSale (S)Preferred shares85,607USD 4.94USD 422,899SEC filing ↗
2026-09-17Lopes Rafael GamboaSale (S)Preferred shares51,800USD 5.09USD 263,662SEC filing ↗
2026-08-10Johannpeter Andre Bier GerdauSale (S)Preferred shares99,200USD 4.94USD 490,048SEC filing ↗
Show recent Form 4 evidence (29 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-23Johannpeter ClaudioSale (S)Preferred shares85,607USD 4.94USD 422,899SEC filing ↗
2026-09-17Lopes Rafael GamboaSale (S)Preferred shares51,800USD 5.09USD 263,662SEC filing ↗
2026-08-10Johannpeter Andre Bier GerdauSale (S)Preferred shares99,200USD 4.94USD 490,048SEC filing ↗
2026-08-06Japur Rafael DornelesSale (S)Preferred shares10,000USD 5.10USD 51,000SEC filing ↗
2026-06-12Da Cunha Gustavo WerneckPurchase (P)Preferred shares165,224USD 4.73USD 781,510SEC filing ↗
2026-06-08Mattiello Marcos ZillesSale (S)Preferred shares10,387USD 5.11USD 53,078SEC filing ↗
2026-06-02Wang Chia YuanSale (S)Preferred shares30,935USD 4.49USD 138,898SEC filing ↗
2026-06-02Metz MauricioSale (S)Preferred shares7,000USD 4.85USD 33,950SEC filing ↗
2026-05-26Metz MauricioSale (S)Preferred shares5,000USD 4.70USD 23,500SEC filing ↗
2026-05-22Japur Rafael DornelesSale (S)Preferred shares5,000USD 4.75USD 23,750SEC filing ↗
2026-05-19Peres Cesar Obino da RosaSale (S)Preferred shares8,000USD 4.60USD 36,800SEC filing ↗
2026-05-13Metz MauricioSale (S)Preferred shares5,000USD 4.85USD 24,250SEC filing ↗
2026-05-08Da Cunha Gustavo WerneckSale (S)Preferred shares432,854USD 4.87USD 2,107,999SEC filing ↗
2026-05-08Da Cunha Gustavo WerneckAward / grant (A)Preferred shares432,774USD 0.00USD 0SEC filing ↗
2026-05-05Metz MauricioSale (S)Preferred shares2,000USD 4.69USD 9,380SEC filing ↗
2026-05-05Wang Chia YuanSale (S)Preferred shares40,000USD 4.75USD 190,000SEC filing ↗
2026-04-30Wang Chia YuanSale (S)Preferred shares20,000USD 4.54USD 90,800SEC filing ↗
2026-04-28Da Cunha Gustavo WerneckSale (S)Preferred shares88,000USD 4.50USD 396,000SEC filing ↗
2026-04-28Wang Chia YuanSale (S)Preferred shares76,700USD 4.49USD 344,383SEC filing ↗
2026-04-28Uhlein ClemirSale (S)Preferred shares38,276USD 4.51USD 172,625SEC filing ↗
2026-04-28Metz MauricioSale (S)Preferred shares1,000USD 4.53USD 4,530SEC filing ↗
2026-04-10Wang Chia YuanSale (S)Preferred shares25,000USD 4.21USD 105,250SEC filing ↗
2026-04-10Metz MauricioSale (S)Preferred shares1,000USD 4.24USD 4,240SEC filing ↗
2026-04-09Wahrhaftig Marcos Eduardo FaracoSale (S)Preferred shares12,419USD 4.06USD 50,421SEC filing ↗
2026-04-09Da Cunha Gustavo WerneckSale (S)Preferred shares50,000USD 4.16USD 208,000SEC filing ↗
2026-04-08Wang Chia YuanSale (S)Preferred shares34,000USD 4.00USD 136,000SEC filing ↗
2026-04-08Da Cunha Gustavo WerneckSale (S)Preferred shares50,000USD 4.01USD 200,500SEC filing ↗
2026-03-20Johannpeter Guilherme Chagas GerdauSale (S)Preferred shares85,607USD 3.29USD 281,647SEC filing ↗
2026-03-20Johannpeter Guilherme Chagas GerdauSale (S)Preferred shares85,607USD 3.29USD 281,647SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerGGB
CIK0001073404
SectorBasic Materials
IndustrySteel Yahoo Finance
SEC SIC3310 Steel Works, Blast Furnaces & Rolling & Finishing Mills
ExchangeNYSE

Data coverage

Local Form 4 history29 transaction lines from 2026-03-20 to 2026-09-23
1 P purchase lines · 27 S sale lines · 1 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.