$GGB

Mattiello Marcos Zilles sold $53K of GGB

Mattiello Marcos Zilles sold 10,387 shares of GERDAU S.A. (GGB) at $5.11 on 2026-06-08.

Original reporting
SEC EDGAR · Mattiello Marcos Zilles
Published Aug 14, 2026, 12:55 PM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Aug 14, 2026, 1:21 PM UTC. Informational, not investment advice.
How this was made
AlphAI summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.
AlphAI market briefInsider activity
Primary signal
$GGB
Neutral
medium confidence
Mentioned
$GGB
Relevance
3/10
AlphAI data visualization · based on SEC EDGAR
Decision brief

The 30-second read

$GGBNeutralLow
01

Why it matters

The disclosed open-market sale reduces insider share exposure, but the filing alone does not change operating outlook or valuation drivers.

02

Market read

Traders may note insider selling as a minor sentiment input, but there is no fundamental catalyst in the text.

03

What to watch

The article does not state whether the sale was part of a broader pattern, nor does it provide context on total holdings, compensation, or whether other insiders filed around the same time.

Relevance 3/10Novelty 3/10Timing: filed 2026-08-14, after-hours/market open impact depends on when traders see the filing

Background

The article is an SEC Form 4 insider transaction disclosure for Gerdau S.A. (GGB).

Company-level read

Ticker impact

$GGBNeutralMedium confidence
Context

SEC Form 4 reports insider Mattiello Marcos Zilles sold 10,387 shares of Gerdau S.A. at $5.11 on 2026-06-08.

Expected impact

Limited near-term impact; any effect is likely short-lived unless follow-on filings show sustained selling.

Evidence & confidence

The filing is primary-source and time-stamped, but the transaction is an insider sale (not a buy), and the article provides no linkage to earnings, guidance, or corporate events.

Market effects

No sector read-through provided; this is company-specific insider activity only.

None indicated.

None indicated.

Counterpoint

Insider sales can be tax- or diversification-driven and do not necessarily reflect bearish fundamentals, especially without any accompanying negative corporate news.

Key entities

  • Gerdau S.A.

    Subject of the Form 4 insider transaction disclosure (GGB).

  • Mattiello Marcos Zilles

    Reporter of the Form 4 open-market sale of 10,387 shares.

Full insider trading history

This story covers one filing. See everything behind it: every insider buy and sell on record, 10b5-1 plans, late filings, and which officers and directors are trading.

Related articles

Med

Why is Gerdau stock sliding today?

Gerdau SA Pref (GGBR4) stock fell 5.2% to R$22.94 after Itaú BBA downgraded it to Market Perform, citing cooling steel market conditions and limited upside. Insider selling and sector-wide pressures from Chinese imports also contributed to the decline, with the stock trading near R$22-23, a range seen as more balanced by analysts.

$GGBMed

Gerdau Q2 Profit Jumps 70% As North America Drives Strong Results

Gerdau S.A. reported Q2 2026 net profit of R$1.466 billion (US$287 million), up 69.7% year on year, and adjusted EBITDA of R$3.430 billion (US$671.6 million), up 33.9%, according to the company. Revenue was R$18 billion (US$3.52 billion). The board approved a R$0.23 per-share dividend, totaling R$451.3 million, with North America driving stronger margins.

$GGBMed

GERDAU S.A. (GGB): Financial results for Q2 2026

GERDAU S.A. (GGB) furnished an SEC Form 6-K — earnings release. Exhibit 99.1 2Q26 Results Gerdau S.A. Videoconference August 5 (Wednesday) 12:00 p.m. BRT 11:00 a.m. NY Click here to access the videoconference RI.GERDAU.COM RI.GERDAU.COM Quarterly Results 2Q26 | Gerdau S.A. 2 São Paulo, August 4, 2026 – Gerdau S.A. (B3: GGBR / NYSE: GGB) annou

$GGBMed

Gerdau S.A. (GGB) Strengthens Edge in Brazil Energy Market with Dona Francisca Energética Hydro Plant Acquisition

Gerdau S.A. (NYSE:GGB) said it agreed to buy Companhia Paranaense de Energia’s 23.03% stake in the Dona Francisca hydro plant for an enterprise value of $29.6 million, according to the company. The deal gives Gerdau full ownership of the 125 MW plant in Brazil’s Rio Grande do Sul state and is expected to add about 30.4 MW to its self-generation capacity.