Arch Capital Group Ltd. (ACGL)
How ACGL actually reacts to news — the realized, point-in-time move the market made, measured across 343 labeled events over the last three years with zero look-ahead.
ACGL’s median reaction, across the day.
Half of all Arch Capital Group Ltd. news events land between -0.67% and +0.38% at 30 minutes.
Reaction stats as of 2026-08-18. Reaction = percent move vs. the price at the news timestamp.
Email me when ACGL moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ACGL’s baseline. Nothing else.
Get “How ACGL reacts to news” as a PDF.
A free one-page summary: ACGL’s median reaction to news and the full breakdown by event type — the numbers on this page, in one page.
Recent ACGL events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 10-Q ARCH CAPITAL GROUP LTD. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.56% | -0.83% | |
| Form 13F-HR ARCH CAPITAL GROUP LTD. For: Jun 30 | SEC filing · Form 13F-HR | SEC EDGAR | -0.56% | -0.83% | |
| Arch Construction Risk Report Reveals Top Challenges Facing Sector Amid Rising Volatility | Press release | Business Wire | -1.22% | -2.21% | |
| Arch RoamRight® Partners with TravelJoy to Simplify Travel Insurance Sales for Travel Advisors | Press release | Business Wire | -1.22% | -2.21% | |
| Arch Capital Group Ltd. Reports 2026 Second Quarter Results | Press release | Business Wire | -0.36% | +2.53% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Jul 28 | SEC filing · Form 8-K | SEC EDGAR | -0.36% | +2.53% | |
| Arch Insurance North America Names Nora Deveau Chief Claims Officer | Press release | Business Wire | -1.16% | -1.50% | |
| Arch Insurance North America Expands Transactional Risk Insurance Capabilities | Press release | Business Wire | -0.01% | +0.16% | |
| Arch Reinsurance Group Elevates William Soares and Jon Schriber | Press release | Business Wire | -0.39% | -0.30% | |
| Arch Insurance Expands Employee Benefits Solutions With New Voluntary Group Insurance Products | Press release | Business Wire | -0.29% | -1.24% | |
| Arch Capital Group Ltd. to Report 2026 Second Quarter Results on July 28 | Press release | Business Wire | -0.08% | -0.83% | |
| Arch RoamRight Named Trip Protection Partner of the Year | Press release | Business Wire | -0.05% | -0.19% | |
| Arch Capital Group Appoints Halgan CEO of Global Reinsurance and Schmeiser CEO of Global Mortgage | Press release | Business Wire | +0.89% | +0.73% | |
| Arch Capital Group Ltd. Announces Pricing of Cash Tender Offers to Purchase Up to a Capped Amount of Certain of Its Subsidiaries’ Debt Securities | Press release | Business Wire | -0.01% | -0.28% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Jun 15 | SEC filing · Form 8-K | SEC EDGAR | +0.89% | +0.73% | |
| Arch Capital Group Ltd. Announces Early Results of Cash Tender Offers to Purchase up to an Increased Capped Amount of Certain of Its Subsidiaries’ Debt Securities | Press release | Business Wire | +0.41% | +0.41% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Jun 09 | SEC filing · Form 8-K | SEC EDGAR | -0.55% | -0.21% | |
| Arch Insurance North America Deepens Commitment to Wholesale Partners with Leadership Appointments | Press release | Business Wire | +0.85% | -0.97% | |
| Arch Capital Group Ltd. Announces Leadership Transition | Press release | Business Wire | +0.09% | +0.71% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Jun 02 | SEC filing · Form 8-K | SEC EDGAR | +0.09% | +0.71% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Jun 03 | SEC filing · Form 8-K | SEC EDGAR | +0.09% | +0.71% | |
| Arch Capital Group Ltd. Announces $2,000,000,000 Public Offering of Senior Notes | Press release | Business Wire | +0.09% | +0.71% | |
| Arch Capital Group Ltd. Announces Cash Tender Offers to Purchase up to a Capped Amount of Certain of Its Subsidiaries’ Debt Securities | Press release | Business Wire | +0.44% | -0.89% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Jun 02 | SEC filing · Form 8-K | SEC EDGAR | +0.44% | -0.89% | |
| Arch Insurance North America Appoints Imran Jalozie Chief Information Officer | Press release | Business Wire | -0.87% | +0.71% | |
| Arch RoamRight Debuts its 2026 Travel Insurance Playbook? | Press release | Business Wire | +0.19% | +0.20% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: May 05 | SEC filing · Form 8-K | SEC EDGAR | -0.07% | -0.64% | |
| Form 10-Q ARCH CAPITAL GROUP LTD. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.31% | +0.52% | |
| Form 13F-HR ARCH CAPITAL GROUP LTD. For: Mar 31 | SEC filing · Form 13F-HR | SEC EDGAR | +0.31% | +0.52% | |
| Arch Capital Group Ltd. Reports 2026 First Quarter Results | Press release | Business Wire | +0.75% | -2.90% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Apr 28 | SEC filing · Form 8-K | SEC EDGAR | +0.75% | -2.90% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Apr 19 | SEC filing · Form 8-K | SEC EDGAR | -0.28% | +0.53% | |
| Arch Insurance North America Expands Primary Cyber Insurance Offerings to Canada | Press release | Business Wire | -0.54% | -0.02% | |
| Form ARS ARCH CAPITAL GROUP LTD. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.60% | -0.06% | |
| Form DEF 14A ARCH CAPITAL GROUP LTD. For: May 05 | SEC filing · Form DEF | SEC EDGAR | +0.60% | -0.06% | |
| Form DEFA14A ARCH CAPITAL GROUP LTD. | SEC filing · Form DEFA14A | SEC EDGAR | +0.60% | -0.06% | |
| Arch Capital Group Ltd. to Report 2026 First Quarter Results on April 28 | Press release | Business Wire | +0.67% | -0.21% | |
| Arch Insurance Publishes 2026 State Disability & Paid Family Leave Reference Guide | Press release | Business Wire | -0.18% | -0.64% | |
| Form 10-K ARCH CAPITAL GROUP LTD. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.16% | +0.13% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Feb 26 | SEC filing · Form 8-K | SEC EDGAR | -0.52% | +0.05% | |
| Arch RoamRight and Tern Launch Seamless Travel Insurance Integration | Press release | Business Wire | -0.07% | +0.55% | |
| Arch Capital Group Ltd. Reports 2025 Fourth Quarter Results | Press release | Business Wire | -0.16% | +2.10% | |
| Form 13F-HR ARCH CAPITAL GROUP LTD. For: Dec 31 | SEC filing · Form 13F-HR | SEC EDGAR | -0.16% | +2.10% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Feb 09 | SEC filing · Form 8-K | SEC EDGAR | -0.16% | +2.10% | |
| Arch Capital Group Ltd. Thanks John Vollaro for 24 Years of Service | Press release | Business Wire | +0.14% | +0.89% | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Jan 15 | SEC filing · Form 8-K | SEC EDGAR | +0.14% | +0.89% | |
| Arch Capital Group Ltd. to Report 2025 Fourth Quarter Results on February 9 | Press release | Business Wire | +0.73% | -0.74% | |
| Arch Insurance Hires Sean Brady as Senior Vice President, Program Management, Consumer Division | Press release | Business Wire | -0.21% | -0.53% | |
| Arch MI Secures Over $249 Million of Indemnity Reinsurance through Bellemeade Re Insurance-Linked Note Transaction and Related Reinsurance | Press release | Business Wire | +0.03% | — | |
| Form 8-K ARCH CAPITAL GROUP LTD. For: Nov 07 | SEC filing · Form 8-K | SEC EDGAR | +0.24% | +1.14% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ACGL section they belong to.
More of the dataset.
ACGL earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Arch Capital Group Ltd.'s median reaction calculated?
Every labeled ACGL 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 343 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. 44% of ACGL'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 2026-08-18.
Does ACGL'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.