Arco Platform Limited - Class A Common Shares (ARCE)
ARCE moved a median of +0.11% 30 minutes after news, and 0.00% by the close. How ARCE actually reacts to news — the realized, point-in-time move the market made, measured across 26 labeled events over the last three years with zero look-ahead.
ARCE’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.07% | 55% | 11 |
| 30-min | +0.11% | 73% | 11 |
| 60-min | +0.11% | 73% | 11 |
| to close | 0.00% | 46% | 11 |
Small sample: only 26 measured events — treat these medians as indicative, not stable.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when ARCE moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ARCE's baseline. Nothing else.
Recent ARCE events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 15-12G Arco Platform Ltd. | SEC filing · Form 15-12G | SEC EDGAR | — | — | |
| Form 6-K Arco Platform Ltd. For: Dec 05 | SEC filing · Form 6-K | SEC EDGAR | — | — | |
| Form S-8 POS Arco Platform Ltd. | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Arco Announces Merger Completion and Becomes a Private Company | Press release | Business Wire | — | — | |
| Form 6-K Arco Platform Ltd. For: Dec 04 | SEC filing · Form 6-K | SEC EDGAR | +0.07% | +0.00% | |
| Arco Announces Shareholders’ Approval of Merger Agreement to Go Private | Press release | Business Wire | +0.07% | +0.00% | |
| Form 6-K Arco Platform Ltd. For: Nov 16 | SEC filing · Form 6-K | SEC EDGAR | -0.07% | -0.07% | |
| Arco to Provide Supplemental Materials for Extraordinary General Meeting of Shareholders | Press release | Business Wire | -0.07% | -0.07% | |
| Arco to Hold Extraordinary General Meeting of Shareholders | Press release | Business Wire | +0.14% | +0.07% | |
| Form 6-K Arco Platform Ltd. For: Nov 07 | SEC filing · Form 6-K | SEC EDGAR | +0.14% | +0.07% | |
| Form CT ORDER Arco Platform Ltd. | SEC filing · Form CT | SEC EDGAR | +0.00% | -0.22% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ARCE section they belong to.
Where else ARCE is measured.
ARCE earnings → · Analyst actions → · SEC filings →
Other Technology names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Pershing Square Inc. (PS) | 27 | +0.16% | 50% |
| Renoworks Software Inc (RW_CDNX) | 27 | 0.00% | 0% |
| Park City Group, Inc. (PCYG) | 26 | +0.64% | 53% |
| IMAGE PROTECT INC (IMTL) | 25 | 0.00% | 26% |
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 Technology names, measured the same way →
Every ticker we measure the same way24
Apple (AAPL)
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Tesla (TSLA)
How TSLA actually reacts to news, measured.
Microsoft (MSFT)
How MSFT actually reacts to news, measured.
Advanced Micro Devices (AMD)
How AMD actually reacts to news, measured.
Amazon (AMZN)
How AMZN actually reacts to news, measured.
Alphabet (GOOG)
How GOOG actually reacts to news, measured.
Meta Platforms (META)
How META actually reacts to news, measured.
Broadcom (AVGO)
How AVGO actually reacts to news, measured.
JPMorgan Chase (JPM)
How JPM actually reacts to news, measured.
Visa (V)
How V actually reacts to news, measured.
Walmart (WMT)
How WMT actually reacts to news, measured.
Eli Lilly (LLY)
How LLY actually reacts to news, measured.
UnitedHealth Group (UNH)
How UNH actually reacts to news, measured.
Netflix (NFLX)
How NFLX actually reacts to news, measured.
Johnson & Johnson (JNJ)
How JNJ actually reacts to news, measured.
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 Arco Platform Limited - Class A Common Shares's median reaction calculated?
Every labeled ARCE 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 26 events is what this page reports. On a sample this small (26 events), treat these medians as indicative, not stable. 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.
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 ARCE'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.