Arch Capital Group Ltd.
US ˙ NasdaqGS ˙ BMG0450A1053

SecurityACGL / Arch Capital Group Ltd.
InstitutionSei Investments Co
Latest Disclosed Ownership1,732,479 shares
Latest Disclosed Value $ 166,179,772
Sei Investments Co reports 4.57% increase in ownership of ACGL / Arch Capital Group Ltd.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 1,732,479 shares of Arch Capital Group Ltd. (US:ACGL) valued at $166,179,386 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 1,656,775 shares of Arch Capital Group Ltd.. This represents a change in shares of 4.57% during the quarter. The current value of the position is $153,047,195 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F ARCH CAP GROUP ORD G0450A105 1,732,479 75,704 4.57 166,180 10.55 0.1640
2025-11-13 2025-09-30 13F ARCH CAP GROUP ORD G0450A105 1,656,775 49,003 3.05 150,319 2.68 0.1616
2025-08-14 2025-06-30 13F ARCH CAP GROUP ORD G0450A105 1,607,772 170,177 11.84 146,389 5.87 0.1697
2025-05-14 2025-03-31 13F/A-1 ARCH CAP GROUP ORD G0450A105 1,437,595 8,090 0.57 138,268 4.74 0.1780
2025-05-13 2025-03-31 13F ARCH CAP GROUP ORD G0450A105 1,435,152 5,647 132,882 0.1445
2025-02-11 2024-12-31 13F ARCH CAP GROUP ORD G0450A105 1,429,505 415,815 41.02 132,014 16.40 0.1695
2024-11-12 2024-09-30 13F ARCH CAP GROUP ORD G0450A105 1,013,690 14,716 1.47 113,412 12.53 0.1473
2024-08-13 2024-06-30 13F ARCH CAP GROUP ORD G0450A105 998,974 17,492 1.78 100,787 11.09 0.1428
2024-05-07 2024-03-31 13F ARCH CAP GROUP ORD G0450A105 981,482 111,823 12.86 90,728 40.47 0.1329
2024-02-14 2023-12-31 13F ARCH CAP GROUP ORD G0450A105 869,659 261,759 43.06 64,590 33.30 0.1037
2023-11-14 2023-09-30 13F ARCH CAP GROUP ORD G0450A105 607,900 318,612 110.14 48,456 123.78 0.0871
2023-08-11 2023-06-30 13F ARCH CAP GROUP ORD G0450A105 289,288 -64,369 -18.20 21,653 -9.79 0.0378
2023-05-12 2023-03-31 13F ARCH CAP GROUP ORD G0450A105 353,657 151,826 75.22 24,003 89.44 0.0446
2023-02-10 2022-12-31 13F ARCH CAP GROUP ORD G0450A105 201,831 -422,035 -67.65 12,671 -55.40 0.0282
2022-11-14 2022-09-30 13F ARCH CAP GROUP ORD G0450A105 623,866 100,240 19.14 28,411 19.21 0.0634
2022-08-15 2022-06-30 13F ARCH CAP GROUP ORD G0450A105 523,626 224,077 74.80 23,832 64.28 0.0515
2022-05-13 2022-03-31 13F ARCH CAP GROUP ORD G0450A105 299,549 39,879 15.36 14,507 25.68 0.0292
2022-02-14 2021-12-31 13F ARCH CAP GROUP ORD G0450A105 259,670 22,011 9.26 11,543 27.34 0.0217
2021-11-12 2021-09-30 13F ARCH CAP GROUP ORD G0450A105 237,659 -19,615 -7.62 9,065 -9.44 0.0190
2021-08-06 2021-06-30 13F ARCH CAP GROUP ORD G0450A105 257,274 31,724 14.07 10,010 15.87 0.0222
2021-05-12 2021-03-31 13F ARCH CAP GROUP ORD G0450A105 225,550 181,801 415.55 8,639 450.96 0.0218
2021-02-08 2020-12-31 13F ARCH CAP GROUP ORD G0450A105 43,749 14,934 51.83 1,568 88.46 0.0041
2020-12-04 2020-09-30 13F/A-1 ARCH CAP GROUP ORD G0450A105 28,815 -6,608 -18.65 832 -17.13 0.0024
2020-11-06 2020-09-30 13F ARCH CAP GROUP ORD G0450A105 34,893 -530 1,010 2,431.8554
2020-08-17 2020-06-30 13F/A-1 ARCH CAP GROUP ORD G0450A105 35,423 -159,771 -81.85 1,004 -81.36 0.0031
2020-08-11 2020-06-30 13F ARCH CAP GROUP ORD G0450A105 9,894 -185,300 299 811.0534
2020-05-14 2020-03-31 13F ARCH CAP GROUP ORD G0450A105 195,194 61,284 45.77 5,386 -4.62 0.0198
2020-02-06 2019-12-31 13F ARCH CAP GROUP ORD G0450A105 133,910 -6,814 -4.84 5,647 -4.43 0.0168
2019-11-12 2019-09-30 13F ARCH CAP GROUP ORD G0450A105 140,724 -69,834 -33.17 5,909 -24.46 0.0151
2019-08-14 2019-06-30 13F ARCH CAP GROUP ORD G0450A105 210,558 2,156 1.03 7,822 15.61 0.0256
2019-05-15 2019-03-31 13F ARCH CAP GROUP ORD G0450A105 208,402 -13,744 -6.19 6,766 13.85 0.0227
2019-02-13 2018-12-31 13F ARCH CAP GROUP ORD G0450A105 222,146 85,731 62.85 5,943 46.34 0.0212
2018-11-08 2018-09-30 13F ARCH CAP GROUP ORD G0450A105 136,415 -273,716 -66.74 4,061 -62.58 0.0147
2018-08-03 2018-06-30 13F ARCH CAP GROUP ORD G0450A105 410,131 252,348 159.93 10,852 -19.64 0.0369
2018-05-11 2018-03-31 13F ARCH CAP GROUP ORD G0450A105 157,783 33,918 27.38 13,505 20.12 0.0518
2018-02-08 2017-12-31 13F ARCH CAP GROUP ORD G0450A105 123,865 -15,170 -10.91 11,243 -17.90 0.0390
2017-11-06 2017-09-30 13F ARCH CAP GROUP ORD G0450A105 139,035 13,487 10.74 13,695 16.93 0.0487
2017-07-31 2017-06-30 13F ARCH CAP GROUP ORD G0450A105 125,548 28,568 29.46 11,712 27.44 0.0467
2017-05-05 2017-03-31 13F ARCH CAP GROUP ORD G0450A105 96,980 -15,291 -13.62 9,190 -5.14 0.0403
2017-02-02 2016-12-31 13F ARCH CAP GROUP ORD G0450A105 112,271 -7,753 -6.46 9,688 1.84 0.0469
2016-11-04 2016-09-30 13F ARCH CAP GROUP ORD G0450A105 120,024 7,083 6.27 9,513 17.00 0.0483
2016-08-11 2016-06-30 13F ARCH CAP GROUP ORD G0450A105 112,941 12,326 12.25 8,131 13.64 0.0488
2016-05-10 2016-03-31 13F/A-1 ARCH CAP GROUP ORD G0450A105 100,615 -8,860 -8.09 7,155 -6.30 0.0445
2016-02-03 2015-12-31 13F ARCH CAP GROUP ORD G0450A105 109,475 103,257 1,660.61 7,636 1,567.25 0.0465
2015-11-02 2015-09-30 13F/A-1 ARCH CAP GROUP ORD G0450A105 6,218 114 1.87 458 11.98 0.0042
2015-10-30 2015-09-30 13F ARCH CAP GROUP ORD G0450A105 6,218 458
2015-08-07 2015-06-30 13F/A-1 ARCH CAP GROUP ORD G0450A105 6,104 385 6.73 409 17.53 0.0037
2015-08-04 2015-06-30 13F ARCH CAP GROUP ORD G0450A105 6,104 385 409 0.0037
2015-05-14 2015-03-31 13F/A-1 ARCH CAP GROUP ORD G0450A105 5,719 112 2.00 348 6.10 0.0030
2015-05-01 2015-03-31 13F ARCH CAP GROUP ORD G0450A105 5,719 348
2015-02-10 2014-12-31 13F ARCH CAP GROUP ORD G0450A105 5,607 5,607 328 0.0029
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.