Accelerant Holdings Class A Common Shares (ARX)
ARX moved a median of -0.08% 30 minutes after news, and 0.00% by the close. How ARX actually reacts to news — the realized, point-in-time move the market made, measured across 116 labeled events over the last three years with zero look-ahead.
ARX’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.06% | 39% | 116 |
| 30-min | -0.08% | 43% | 116 |
| 60-min | -0.15% | 42% | 116 |
| to close | 0.00% | 50% | 113 |
| Middle 50% of ARX reactions | -1.03% to +0.70% |
|---|---|
| Median reaction (30-min) | -0.08% |
| Measured reactions | 116 |
Half of all Accelerant Holdings Class A Common Shares news events land between -1.03% and +0.70% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How ARX reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst downgrades | 15 | -0.13% | 33% | +0.05% |
| Coverage initiations | 19 | +1.89% | 90% | +1.56% |
| Rating reiterations | 26 | +0.50% | 58% | -0.16% |
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 ARX ranks against every other measured name →
That’s how ARX usually reacts — get an email when it moves on news →Email me when ARX moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ARX's baseline. Nothing else.
Recent ARX events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Accelerant Announces Expiration of “Go-Shop” Period | Press release | Business Wire | +0.13% | +0.10% | |
| Form 8-K Accelerant Holdings For: Sep 23 | SEC filing · Form 8-K | SEC EDGAR | +0.13% | +0.10% | |
| AM Best Places Credit Ratings of Accelerant Holdings’ Rated Subsidiaries Under Review With Developing Implications | Press release | Business Wire | +0.00% | -0.20% | |
| Form 8-K Accelerant Holdings For: Aug 13 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +0.05% | |
| Form DEFA14A Accelerant Holdings | SEC filing · Form DEFA14A | SEC EDGAR | +0.00% | +0.05% | |
| Accelerant Announces Second Quarter 2026 Results | Press release | Business Wire | -0.41% | -0.56% | |
| Accelerant Enters into Definitive Agreement to be Acquired by Thoma Bravo | Press release | Business Wire | -0.41% | -0.56% | |
| Are HZO, BZH, ARX Obtaining Fair Deals for their Shareholders? | Press release | PR Newswire | +0.00% | +0.23% | |
| ARX Stock Alert: Halper Sadeh LLC is Investigating Whether Accelerant Holdings is Obtaining a Fair Price for its Shareholders | Press release | Business Wire | -0.41% | -0.56% | |
| Form 10-Q Accelerant Holdings For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.41% | -0.56% | |
| Form 8-K Accelerant Holdings For: Aug 13 | SEC filing · Form 8-K | SEC EDGAR | -0.41% | -0.56% | |
| Form DEFA14A Accelerant Holdings | SEC filing · Form DEFA14A | SEC EDGAR | -0.41% | -0.56% | |
| Accelerant Announces Date of Second Quarter 2026 Financial Results and Conference Call | Press release | Business Wire | +0.32% | +2.52% | |
| Accelerant Announces Partnership With New Third-Party Capitalized Insurer WoodStar | Press release | Business Wire | -1.49% | -5.52% | |
| Accelerant Announces Enhanced Lloyd’s Partnership with the Launch of the ARX Consortium | Press release | Business Wire | -0.12% | +0.98% | |
| Incline P&C Group Announces Enhanced Partnership with Accelerant | Press release | PR Newswire | +2.52% | +7.81% | |
| Accelerant to Present at William Blair’s 46th Annual Growth Stock Conference | Press release | Business Wire | +0.93% | -1.67% | |
| Form 8-K Accelerant Holdings For: May 29 | SEC filing · Form 8-K | SEC EDGAR | +0.93% | -1.67% | |
| FutureProof Launches an AI E&S Program with Bridge Specialty Group to Target Condo and Renters Policies in Catastrophe-Exposed Southeast | Press release | Business Wire | -1.22% | -2.85% | |
| Accelerant Announces First Quarter 2026 Results | Press release | Business Wire | +6.68% | +4.88% | |
| Form 10-Q Accelerant Holdings For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +6.68% | +4.88% | |
| Form 8-K Accelerant Holdings For: May 13 | SEC filing · Form 8-K | SEC EDGAR | +6.68% | +4.88% | |
| Form 8-K Accelerant Holdings For: May 12 | SEC filing · Form 8-K | SEC EDGAR | -0.98% | -5.72% | |
| Accelerant Announces Date of First Quarter 2026 Financial Results and Conference Call | Press release | Business Wire | -2.52% | +3.82% | |
| Accelerant Completes CFO Transition | Press release | Business Wire | -1.35% | -3.37% | |
| Form DEF 14A Accelerant Holdings For: May 12 | SEC filing · Form DEF | SEC EDGAR | -0.35% | +1.76% | |
| Form DEFA14A Accelerant Holdings | SEC filing · Form DEFA14A | SEC EDGAR | -0.35% | +1.76% | |
| Accelerant Announces Fourth Quarter and Full Year 2025 Results | Press release | Business Wire | +0.52% | +5.82% | |
| Form 10-K Accelerant Holdings For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.52% | +5.82% | |
| Form 8-K Accelerant Holdings For: Mar 13 | SEC filing · Form 8-K | SEC EDGAR | +0.52% | +5.82% | |
| Form 8-K Accelerant Holdings For: Feb 26 | SEC filing · Form 8-K | SEC EDGAR | -0.64% | +8.36% | |
| Form 8-K Accelerant Holdings For: Feb 27 | SEC filing · Form 8-K | SEC EDGAR | +2.55% | +3.95% | |
| Accelerant Announces Unaudited Preliminary Fourth Quarter and Full Year 2025 Financial Results | Press release | Business Wire | -0.64% | +8.36% | |
| Accelerant Announces Leadership Updates Across Legal and Investor Relations | Press release | Business Wire | +2.00% | +7.79% | |
| Accelerant Announces Date of Fourth Quarter and Full Year 2025 Financial Results and Conference Call | Press release | Business Wire | +0.51% | -2.73% | |
| Accelerant Announces Third Quarter 2025 Results | Press release | Business Wire | -0.77% | — | |
| Form 10-Q Accelerant Holdings For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.77% | — | |
| Form 8-K Accelerant Holdings For: Nov 12 | SEC filing · Form 8-K | SEC EDGAR | -0.77% | — | |
| Accelerant Announces Date of Third Quarter 2025 Financial Results and Conference Call | Press release | Business Wire | -0.72% | +7.97% | |
| Accelerant Announces Partnership With AF Specialty to Expand Risk Exchange Capacity | Press release | Business Wire | +1.25% | -4.59% | |
| Accelerant Announces Second Quarter 2025 Results | Press release | Business Wire | -4.55% | -22.96% | |
| Form 10-Q Accelerant Holdings For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -2.79% | -6.74% | |
| Form 8-K Accelerant Holdings For: Aug 28 | SEC filing · Form 8-K | SEC EDGAR | -4.55% | -22.96% | |
| Accelerant Announces Date of Second Quarter 2025 Financial Results and Conference Call | Press release | Business Wire | -0.37% | -0.70% | |
| Accelerant Holdings Announces Closing of Upsized Initial Public Offering and Full Exercise of Over-Allotment Option | Press release | Business Wire | +2.18% | -0.97% | |
| Accelerant Holdings Announces Pricing of Upsized Initial Public Offering | Press release | Business Wire | -1.05% | -7.02% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ARX section they belong to.
Where else ARX is measured.
ARX earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Accelerant Holdings Class A Common Shares's median reaction calculated?
Every labeled ARX 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 116 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. 43% of ARX'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 ARX'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.