Gerdau S.A. (GGB)
GGB moved a median of +0.19% 30 minutes after news, and +0.55% by the close. How GGB actually reacts to news — the realized, point-in-time move the market made, measured across 158 labeled events over the last three years with zero look-ahead.
GGB’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 46% | 158 |
| 30-min | +0.19% | 64% | 158 |
| 60-min | +0.26% | 63% | 158 |
| to close | +0.55% | 58% | 158 |
| Middle 50% of GGB reactions | -0.24% to +0.92% |
|---|---|
| Median reaction (30-min) | +0.19% |
| Measured reactions | 158 |
Half of all Gerdau S.A. news events land between -0.24% and +0.92% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How GGB reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 18 | +0.67% | 61% | +0.63% |
| Analyst downgrades | 17 | -0.31% | 47% | -0.69% |
| Rating reiterations | 14 | +0.13% | 64% | +0.51% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 3 further classes were observed with fewer than 10 measured events and are not published. See how GGB ranks against every other measured name →
That’s how GGB usually reacts — get an email when it moves on news →Email me when GGB moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to GGB's baseline. Nothing else.
Recent GGB events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 6-K GERDAU S.A. For: Aug 31 | SEC filing · Form 6-K | SEC EDGAR | +0.70% | +2.63% | |
| Form 6-K GERDAU S.A. For: Aug 06 | SEC filing · Form 6-K | SEC EDGAR | -0.59% | -2.56% | |
| Form 6-K GERDAU S.A. For: Aug 05 | SEC filing · Form 6-K | SEC EDGAR | -0.10% | +4.68% | |
| Form 6-K GERDAU S.A. For: Aug 04 | SEC filing · Form 6-K | SEC EDGAR | -0.10% | +4.68% | |
| GERDAU S.A. - CONSOLIDATED INFORMATION | Press release | PR Newswire | -0.10% | +4.68% | |
| Form 6-K GERDAU S.A. For: Jul 20 | SEC filing · Form 6-K | SEC EDGAR | -0.64% | -1.28% | |
| Form 6-K GERDAU S.A. For: Jun 15 | SEC filing · Form 6-K | SEC EDGAR | +0.11% | -0.43% | |
| Form SD GERDAU S.A. | SEC filing · Form SD | SEC EDGAR | +0.21% | +0.85% | |
| Form 6-K GERDAU S.A. For: Apr 27 | SEC filing · Form 6-K | SEC EDGAR | +0.57% | +3.44% | |
| Form 6-K GERDAU S.A. For: Apr 28 | SEC filing · Form 6-K | SEC EDGAR | +0.57% | +3.44% | |
| GERDAU S.A. - CONSOLIDATED INFORMATION | Press release | PR Newswire | +0.57% | +3.44% | |
| Form 6-K GERDAU S.A. For: Apr 16 | SEC filing · Form 6-K | SEC EDGAR | +0.34% | -1.38% | |
| Form 20-F GERDAU S.A. For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | -0.15% | -1.18% | |
| GERDAU S.A. - FORM 20-F | Press release | PR Newswire | -0.15% | -1.18% | |
| Form 6-K GERDAU S.A. For: Feb 24 | SEC filing · Form 6-K | SEC EDGAR | -0.87% | +0.99% | |
| Form 6-K GERDAU S.A. For: Feb 23 | SEC filing · Form 6-K | SEC EDGAR | -0.87% | +0.99% | |
| GERDAU S.A. - CONSOLIDATED INFORMATION | Press release | PR Newswire | -0.87% | +0.99% | |
| Form 6-K GERDAU S.A. For: Dec 19 | SEC filing · Form 6-K | SEC EDGAR | +0.41% | +0.82% | |
| Form 6-K GERDAU S.A. For: Dec 02 | SEC filing · Form 6-K | SEC EDGAR | +0.41% | +1.38% | |
| Form 6-K GERDAU S.A. For: Oct 31 | SEC filing · Form 6-K | SEC EDGAR | -0.28% | +0.58% | |
| Form 6-K GERDAU S.A. For: Oct 30 | SEC filing · Form 6-K | SEC EDGAR | +0.59% | +2.35% | |
| GERDAU S.A. - CONSOLIDATED INFORMATION | Press release | PR Newswire | +0.59% | +2.35% | |
| Form 6-K GERDAU S.A. For: Oct 01 | SEC filing · Form 6-K | SEC EDGAR | +0.64% | +1.29% | |
| Form 6-K GERDAU S.A. For: Aug 01 | SEC filing · Form 6-K | SEC EDGAR | -0.51% | -2.72% | |
| Form 6-K GERDAU S.A. For: Jul 31 | SEC filing · Form 6-K | SEC EDGAR | +0.17% | -1.04% | |
| GERDAU S.A. - CONSOLIDATED INFORMATION | Press release | PR Newswire | +0.17% | -1.04% | |
| Form CERT GERDAU S.A. | SEC filing · Form CERT | SEC EDGAR | -0.17% | -0.68% | |
| Form 6-K GERDAU S.A. For: Jun 09 | SEC filing · Form 6-K | SEC EDGAR | +0.16% | -1.25% | |
| Announcement by Gerdau S.A. of Consideration for Cash Tender Offer for Any and All Outstanding 4.875% Notes due 2027 issued by Gerdau Trade Inc. | Press release | PR Newswire | -0.16% | -0.31% | |
| Announcement by Gerdau S.A. of Results of Cash Tender Offer for Any and All Outstanding 4.875% Notes due 2027 issued by Gerdau Trade Inc. | Press release | PR Newswire | +0.16% | -1.25% | |
| Form 6-K GERDAU S.A. For: Jun 09 | SEC filing · Form 6-K | SEC EDGAR | +0.63% | +0.63% | |
| Form 8-A12B GERDAU S.A. | SEC filing · Form 8-A12B | SEC EDGAR | +0.00% | +0.16% | |
| Form 6-K GERDAU S.A. For: Jun 04 | SEC filing · Form 6-K | SEC EDGAR | -0.34% | +0.00% | |
| Announcement of Offer to Purchase for Cash Any and All of the Outstanding 4.875% Notes due 2027 issued by Gerdau Trade Inc. | Press release | PR Newswire | -1.07% | +1.43% | |
| Form 6-K GERDAU S.A. For: Jun 03 | SEC filing · Form 6-K | SEC EDGAR | -1.07% | +1.43% | |
| Form F-3ASR GERDAU S.A. | SEC filing · Form F-3ASR | SEC EDGAR | -1.07% | +1.43% | |
| Form SD GERDAU S.A. | SEC filing · Form SD | SEC EDGAR | +0.35% | +0.71% | |
| Form 6-K GERDAU S.A. For: May 14 | SEC filing · Form 6-K | SEC EDGAR | +0.36% | +0.72% | |
| Form 6-K GERDAU S.A. For: Apr 30 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | +0.58% | |
| Form 6-K GERDAU S.A. For: Apr 28 | SEC filing · Form 6-K | SEC EDGAR | +0.75% | +1.88% | |
| Form 6-K GERDAU S.A. For: Apr 29 | SEC filing · Form 6-K | SEC EDGAR | +1.17% | +1.56% | |
| GERDAU S.A. - CONSOLIDATED INFORMATION | Press release | PR Newswire | +0.75% | +1.88% | |
| Form 20-F GERDAU S.A. For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | +0.17% | +2.37% | |
| GERDAU S.A. - FORM 20-F | Press release | PR Newswire | +0.17% | +2.37% | |
| Form 6-K GERDAU S.A. For: Feb 20 | SEC filing · Form 6-K | SEC EDGAR | -0.52% | -2.42% | |
| Form 6-K GERDAU S.A. For: Feb 21 | SEC filing · Form 6-K | SEC EDGAR | +0.34% | -1.40% | |
| Form 6-K GERDAU S.A. For: Feb 20 | SEC filing · Form 6-K | SEC EDGAR | +0.66% | -4.30% | |
| GERDAU S.A. - CONSOLIDATED INFORMATION | Press release | PR Newswire | +0.66% | -4.30% | |
| Form 6-K GERDAU S.A. For: Feb 10 | SEC filing · Form 6-K | SEC EDGAR | -0.50% | +1.00% | |
| Form 6-K GERDAU S.A. For: Jan 22 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | -1.85% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the GGB section they belong to.
Where else GGB is measured.
GGB earnings → · Analyst actions → · SEC filings →
Other Basic Materials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| INNOVEST GLOBAL INC (IVST) | 160 | 0.00% | 26% |
| Natural Resource Partners LP Limited Partnership (NRP) | 159 | +0.18% | 53% |
| LIBERTY STAR URANM METLS (LBSR) | 158 | 0.00% | 37% |
| Nexa Resources S.A. Common Shares (NEXA) | 158 | -0.26% | 33% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Basic Materials names, measured the same way →
Every ticker we measure the same way24
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Microsoft (MSFT)
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Advanced Micro Devices (AMD)
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Amazon (AMZN)
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Alphabet (GOOG)
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Meta Platforms (META)
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JPMorgan Chase (JPM)
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Walmart (WMT)
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Eli Lilly (LLY)
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UnitedHealth Group (UNH)
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Netflix (NFLX)
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Johnson & Johnson (JNJ)
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Exxon Mobil (XOM)
How XOM actually reacts to news, measured.
Home Depot (HD)
How HD actually reacts to news, measured.
Costco (COST)
How COST actually reacts to news, measured.
Mastercard (MA)
How MA actually reacts to news, measured.
Oracle (ORCL)
How ORCL actually reacts to news, measured.
Salesforce (CRM)
How CRM actually reacts to news, measured.
Bank of America (BAC)
How BAC actually reacts to news, measured.
Coca-Cola (KO)
How KO actually reacts to news, measured.
Walt Disney (DIS)
How DIS actually reacts to news, measured.
Browse all tickers
Every name we’ve measured, in one place.
How the numbers are made.
How is Gerdau S.A.'s median reaction calculated?
Every labeled GGB news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 158 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 64% of GGB's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does GGB's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.