Official announcements (8-K)

Announced another event (Item 8.01)

Another event the company chose to report publicly.

In the company's wordsOn November 5, 2026, Arch Capital Group Ltd. (the “Company”) increased its authorization for its existing share repurchase program by $3.0 billion, which, as in the past, may be effected from time to time in open market or privately negotiated transactions. After taking into account this increased authorization and recent share repurchases, approximately $3.6 billion of share repurchases are available under the program as of November 5, 2026. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations. Preferred Share Dividends. On November 5, 2026, the …

Shared information with investors (Item 7.01)

Information shared with investors, often a presentation or press release.

In the company's wordsOn October 30, 2026, Arch Insurance North America, part of Arch Capital Group Ltd. (“Arch”) that includes Arch’s insurance operations in the United States and Canada, announced that it had entered into an agreement to acquire Premier Dealer Holding Corp., a Dublin, Ohio-based provider of automotive finance and insurance products and services. The transaction is subject to regulatory approvals and satisfaction of other customary closing conditions. The information in this Current Report on Form 8-K shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under …

Signed a major agreement (Item 1.01)

A major new contract can change what the company sells, spends or owes.

In the company's wordsOn October 28, 2026, Arch Reinsurance Ltd. (“ArchRe”), a wholly-owned subsidiary of Arch Capital Group Ltd. (“Arch”), entered into Amendment No. 6 to Letter of Credit Facility Agreement (“Amendment No. 6”), as the borrower with Lloyds Bank Corporate Markets plc (“Lloyds”), as Administrative Agent and L/C Agent, which amends the Letter of Credit Facility Agreement, dated as of November 3, 2020, as amended by Amendment No. 1 to Letter of Credit Facility Agreement dated as of October 29, 2021, as further amended by Amendment No. 2 and Joinder to Letter of Credit Facility Agreement dated as of October 27, 2022, as further amended by Amendment No. 3 and Joinder to Letter of …

Took on a major new debt or obligation (Item 2.03)

New borrowing adds to what the company owes and the interest it pays.

In the company's wordsThe information set forth in Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.

Change in its leaders or board (Item 5.02)

New leaders or board members can bring a change in strategy.

In the company's words(b) On October 26, 2026, Moira Kilcoyne resigned from her position as a member of the Board of Directors (the “Board”) of Arch Capital Group Ltd. (the “Company”), effective immediately. Her resignation was not because of a disagreement with Arch on any matter relating to Arch’s operations, policies, or practices. The Board and management thank Ms. Kilcoyne for her service and contributions to the Company, informed by her extensive financial services experience, which has supported the business through a period of strong financial performance. 2

Shared financial results (Item 2.02)

New results: figures on this page will update when the full quarterly or annual report is filed.

In the company's wordsOn October 27, 2026 Arch Capital Group Ltd. issued a press release reporting its earnings and the availability of its financial supplement for the quarter ended September 30, 2026. The press release and financial supplement are attached to this Current Report on Form 8-K as Exhibit 99.1 and Exhibit 99.2, respectively, and are incorporated herein by reference. The information in this Current Report on Form 8-K, including the information set forth in Exhibit 99.1 and Exhibit 99.2, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act …

Shared financial results (Item 2.02)

New results: figures on this page will update when the full quarterly or annual report is filed.

In the company's wordsOn July 28, 2026 Arch Capital Group Ltd. issued a press release reporting its earnings and the availability of its financial supplement for the quarter ended June 30, 2026. The press release and financial supplement are attached to this Current Report on Form 8-K as Exhibit 99.1 and Exhibit 99.2, respectively, and are incorporated herein by reference. The information in this Current Report on Form 8-K, including the information set forth in Exhibit 99.1 and Exhibit 99.2, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, …

Announced another event (Item 8.01)

Another event the company chose to report publicly.

In the company's wordsOn June 15, 2026, Arch Capital Group Ltd. (“ACGL”) issued a press release (the “Early Results and Increased Maximum Amount Press Release”) announcing the early results for the previously announced cash tender offers (the “Tender Offers”) by its wholly-owned subsidiaries (x) Arch Capital Group (U.S.) Inc. of its outstanding 5.144% Senior Notes due 2043 and (y) Arch Capital Finance LLC of its outstanding 5.031% Senior Notes due 2046, for an increased aggregate principal amount of up to $417,851,000 (the “Maximum Amount”). On June 16, 2026, ACGL issued a press release (the “Pricing Press Release”) announcing the pricing of the Tender Offers. A copy of the Early Results and …

Signed a major agreement (Item 1.01)

A major new contract can change what the company sells, spends or owes.

In the company's wordsOn June 9, 2026, Arch Capital Group Ltd. (the “Issuer”), completed the public offering of (i) $600,000,000 aggregate principal amount of 5.250% senior notes due 2036 (the “2036 Notes”) and (ii) $1,400,000,000 aggregate principal amount of 5.950% senior notes due 2056 (the “2056 Notes” and, together with the 2036 Notes, the “Notes”). The Notes have been registered under the Securities Act of 1933, as amended (the “Securities Act”), pursuant to the Issuer’s universal shelf registration statement on Form S-3 (File No. 333-275570), as supplemented by the prospectus supplement dated June 2, 2026, previously filed with the Securities and Exchange Commission under the Securities …

Took on a major new debt or obligation (Item 2.03)

New borrowing adds to what the company owes and the interest it pays.

In the company's wordsThe information provided in Item 1.01 of this report is incorporated by reference into this Item 2.03. 2

Announced another event (Item 8.01)

Another event the company chose to report publicly.

In the company's wordsIn connection with the offering of the Notes, the Issuer is filing the legal opinions relating to the offering as Exhibit 5.1 and 5.2 to this report.

Change in its leaders or board (Item 5.02)

New leaders or board members can bring a change in strategy.

In the company's words(“Arch” or the “Company”) announced today that David Gansberg is stepping down from his role as a President of Arch effective immediately and will be departing the Company following a distinguished tenure, having played an important role in building the organization to its current position. In his role, Mr. Gansberg oversaw Arch’s Global Insurance Group. Mr. Gansberg will be entitled to receive the benefits under Section 5.02 and 5.04 of his employment agreement dated as of March 1, 2019, as amended, and under his equity-based compensation awards under the applicable equity award agreements, subject to compliance with the terms and conditions thereof. In connection with …

Shared information with investors (Item 7.01)

Information shared with investors, often a presentation or press release.

In the company's wordsOn June 3, 2026, Arch issued a press release announcing the aforementioned events. A copy of this press release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by reference. The information in Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under that section, nor shall it be deemed to be incorporated by reference into the filings of the registrant under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set …

Signed a major agreement (Item 1.01)

A major new contract can change what the company sells, spends or owes.

In the company's wordsOn June 2, 2026, Arch Capital Group Ltd. (“ACGL” or the “Issuer”) entered into an Underwriting Agreement pursuant to which the Issuer agreed to sell, and the underwriters named therein agreed to purchase, subject to and upon terms and conditions set forth therein, (i) $600,000,000 aggregate principal amount of 5.250% senior notes due 2036 (the “2036 Notes”) and (ii) $1,400,000,000 aggregate principal amount of 5.950% senior notes due 2056 (the “2056 Notes” and, together with the 2036 Notes, the “Notes”). The offering was made pursuant to an effective shelf registration statement and a prospectus supplement and is expected to close on June 9, 2026. A copy of the …

Announced another event (Item 8.01)

Another event the company chose to report publicly.

In the company's wordsOn June 2, 2026, ACGL issued a press release announcing it priced the underwritten public offering of the Notes. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by reference.

Announced another event (Item 8.01)

Another event the company chose to report publicly.

In the company's wordsOn June 2, 2026, Arch Capital Group Ltd. (“ACGL”) issued a press release announcing that its wholly-owned subsidiaries, Arch Capital Group (U.S.) Inc. (“Arch Capital Group (U.S.)”) and Arch Capital Finance LLC (“Arch Capital Finance”), commenced cash tender offers to purchase (the “Tender Offers”) for a combined aggregate purchase price of up to $350 million (i) Arch Capital Group (U.S.)’s outstanding 5.144% Senior Notes due 2043, and (ii) Arch Capital Finance’s outstanding 5.031% Senior Notes due 2046. A copy of the press release announcing the Tender Offers is attached hereto as Exhibit 99.1 and incorporated by reference herein.

Shared shareholder vote results (Item 5.07)

How shareholders voted on board members and proposals.

In the company's wordsArch Capital Group Ltd.'s (“ACGL”) annual meeting of shareholders was held on May 5, 2026. At the meeting, the holders of 311,259,137 common shares, which represents approximately 87 percent of the outstanding shares entitled to vote as of the record date of March 9, 2026, were represented in person or by proxy. Matters submitted to shareholders at the meeting and the voting results thereof were as follows: Item 1. The vote on the election of the three Class I directors to hold office for a term of three years and until their respective successors are duly elected and qualified or their earlier resignation or removal. The voting results were as follows: NOMINEE FOR …

Announced another event (Item 8.01)

Another event the company chose to report publicly.

In the company's wordsOn May 6, 2026, the Board of Directors (the “Board”) of ACGL declared dividends with respect to the outstanding 13,200,000 depositary shares, each representing a 1/1000th interest in a share of 5.45% Non-Cumulative Preferred Shares, Series F, $0.01 per share (“Series F Shares”), with a $25,000 liquidation preference per share (equivalent to a $25.00 liquidation preference per depositary share), as outlined below. All such dividends will be payable out of lawfully available funds for the payment of dividends under Bermuda law on June 30, 2026 to holders of record of the Series F Shares, as of June 15, 2026, unless determined otherwise by the Board or the Executive …

Shared financial results (Item 2.02)

New results: figures on this page will update when the full quarterly or annual report is filed.

Announced another event (Item 8.01)

Another event the company chose to report publicly.

Announced another event (Item 8.01)

Another event the company chose to report publicly.

Shared financial results (Item 2.02)

New results: figures on this page will update when the full quarterly or annual report is filed.

Change in its leaders or board (Item 5.02)

New leaders or board members can bring a change in strategy.

Announced another event (Item 8.01)

Another event the company chose to report publicly.

Signed a major agreement (Item 1.01)

A major new contract can change what the company sells, spends or owes.

Took on a major new debt or obligation (Item 2.03)

New borrowing adds to what the company owes and the interest it pays.

Shared financial results (Item 2.02)

New results: figures on this page will update when the full quarterly or annual report is filed.

Announced another event (Item 8.01)

Another event the company chose to report publicly.

Shared financial results (Item 2.02)

New results: figures on this page will update when the full quarterly or annual report is filed.

Shared shareholder vote results (Item 5.07)

How shareholders voted on board members and proposals.

Announced another event (Item 8.01)

Another event the company chose to report publicly.

Shared financial results (Item 2.02)

New results: figures on this page will update when the full quarterly or annual report is filed.

Change in its leaders or board (Item 5.02)

New leaders or board members can bring a change in strategy.

Announced another event (Item 8.01)

Another event the company chose to report publicly.

Shared financial results (Item 2.02)

New results: figures on this page will update when the full quarterly or annual report is filed.

Change in its leaders or board (Item 5.02)

New leaders or board members can bring a change in strategy.

Announced another event (Item 8.01)

Another event the company chose to report publicly.

Announced another event (Item 8.01)

Another event the company chose to report publicly.