Arch Capital (ACGL)

=== SEC Form 3 — Statement of Changes in Beneficial Ownership === Document Type: 3 Period of Report: 2026-09-03 --- Issuer --- Name: ARCH CAPITAL GROUP LTD. (ACGL) CIK: 0000947484 --- Reporting Owner --- Name: Schmeiser Robert Michael CIK: 0002153453 Role: Officer (CEO, Arch Global Mortgage Grp.) --- Holdings --- [Holding #1] Security: Common Shares, $.0011 par value per share Ownership: D (Direct) [Holding #2] Security: Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F1] This stock option is exercisable in three equal annual installments commencing February 27, 2021, and the next two installments on February 27, 2022 and February 27, 2023, subject to the applicable award agreement. [Holding #3] Security: Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] This stock option is exercisable in three equal annual installments commencing February 26, 2022, and the next two installments on February 26, 2023 and February 26, 2024, subject to the applicable award agreement. [Holding #4] Security: Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F3] This stock option is exercisable in three equal annual installments commencing February 25, 2023, and the next two installments on February 25, 2024 and February 25, 2025, subject to the applicable award agreement. [Holding #5] Security: Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F4] This stock option is exercisable in three equal annual installments commencing February 24, 2024, and the next two installments on February 24, 2025 and February 24, 2026, subject to the applicable award agreement. [Holding #6] Security: Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F5] This stock option is exercisable in three equal annual installments commencing March 6, 2024, and the next two installments on March 6, 2025 and March 6, 2026, subject to the applicable award agreement. [Holding #7] Security: Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F6] The stock option is exercisable in three equal annual installments commencing February 27, 2025, and the next two installments on February 27, 2026 and February 27, 2027, subject to the applicable award agreement [Holding #8] Security: Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F7] The stock option is exercisable in three equal annual installments commencing March 4, 2026, and the next two installments on March 4, 2027 and March 4, 2028, subject to the applicable award agreement. [Holding #9] Security: Stock Option (Right to Buy) Ownership: D (Direct) [Holding #10] Security: Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F8] This stock option is exercisable in three equal annual installments commencing March 3, 2027, and the next two installments on March 3, 2028 and March 3, 2029, subject to the applicable award agreement. --- Footnotes (Complete Index) --- F1: This stock option is exercisable in three equal annual installments commencing February 27, 2021, and the next two installments on February 27, 2022 and February 27, 2023, subject to the applicable award agreement. F2: This stock option is exercisable in three equal annual installments commencing February 26, 2022, and the next two installments on February 26, 2023 and February 26, 2024, subject to the applicable award agreement. F3: This stock option is exercisable in three equal annual installments commencing February 25, 2023, and the next two installments on February 25, 2024 and February 25, 2025, subject to the applicable award agreement. F4: This stock option is exercisable in three equal annual installments commencing February 24, 2024, and the next two installments on February 24, 2025 and February 24, 2026, subject to the applicable award agreement. F5: This stock option is exercisable in three equal annual installments commencing March 6, 2024, and the next two installments on March 6, 2025 and March 6, 2026, subject to the applicable award agreement. F6: The stock option is exercisable in three equal annual installments commencing February 27, 2025, and the next two installments on February 27, 2026 and February 27, 2027, subject to the applicable award agreement F7: The stock option is exercisable in three equal annual installments commencing March 4, 2026, and the next two installments on March 4, 2027 and March 4, 2028, subject to the applicable award agreement. F8: This stock option is exercisable in three equal annual installments commencing March 3, 2027, and the next two installments on March 3, 2028 and March 3, 2029, subject to the applicable award agreement. --- Signature --- /s/ /s/ Robert Michael Schmeiser (2026-09-14)