Arch Capital Group Ltd.
US ˙ NasdaqGS ˙ BMG0450A1053

SecurityACGL / Arch Capital Group Ltd.
InstitutionNorthstar Group, Inc.
Latest Disclosed Ownership131,179 shares
Latest Disclosed Value $ 12,591,900
Northstar Group, Inc. reports 0.76% increase in ownership of ACGL / Arch Capital Group Ltd.

On April 28, 2026 - Northstar Group, Inc. filed a 13F-HR form disclosing ownership of 131,179 shares of Arch Capital Group Ltd. (US:ACGL) valued at $12,591,872 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 130,193 shares of Arch Capital Group Ltd.. This represents a change in shares of 0.76% during the quarter. The current value of the position is $11,588,353 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)
2026-04-28 2026-03-31 13F ARCH CAP GROUP ORD G0450A105 131,179 986 0.76 12,592 0.82 1.7800
2026-02-13 2025-12-31 13F ARCH CAP GROUP ORD G0450A105 130,193 4,009 3.18 12,488 9.08 1.7009
2025-10-22 2025-09-30 13F ARCH CAP GROUP ORD G0450A105 126,184 1,816 1.46 11,449 1.10 1.6675
2025-07-18 2025-06-30 13F ARCH CAP GROUP ORD G0450A105 124,368 753 0.61 11,324 -4.76 1.7488
2025-04-17 2025-03-31 13F ARCH CAP GROUP ORD G0450A105 123,615 1,418 1.16 11,889 5.36 1.9276
2025-01-28 2024-12-31 13F ARCH CAP GROUP ORD G0450A105 122,197 5,947 5.12 11,285 -13.24 1.8900
2024-10-09 2024-09-30 13F ARCH CAP GROUP ORD G0450A105 116,250 835 0.72 13,006 11.70 2.2655
2024-07-18 2024-06-30 13F ARCH CAP GROUP ORD G0450A105 115,415 -50 -0.04 11,644 9.10 2.2011
2024-04-18 2024-03-31 13F ARCH CAP GROUP ORD G0450A105 115,465 150 0.13 10,674 24.63 2.0964
2024-01-10 2023-12-31 13F ARCH CAP GROUP ORD G0450A105 115,315 -100 -0.09 8,564 -6.90 1.8604
2023-10-19 2023-09-30 13F ARCH CAP GROUP ORD G0450A105 115,415 320 0.28 9,200 6.79 2.1809
2023-08-03 2023-06-30 13F ARCH CAP GROUP ORD G0450A105 115,095 -100 -0.09 8,615 10.18 2.0199
2023-04-27 2023-03-31 13F ARCH CAP GROUP ORD G0450A105 115,195 -500 -0.43 7,818 7.64 2.0050
2023-01-26 2022-12-31 13F ARCH CAP GROUP ORD G0450A105 115,695 -420 -0.36 7,263 37.35 2.0593
2022-10-26 2022-09-30 13F ARCH CAP GROUP ORD G0450A105 116,115 3,534 3.14 5,288 3.26 1.5846
2022-07-27 2022-06-30 13F ARCH CAP GROUP ORD G0450A105 112,581 2,596 2.36 5,121 -3.85 1.4808
2022-05-05 2022-03-31 13F ARCH CAP GROUP ORD G0450A105 109,985 2,404 2.23 5,326 11.38 1.2798
2022-01-31 2021-12-31 13F ARCH CAP GROUP ORD G0450A105 107,581 1,945 1.84 4,782 18.54 1.1408
2021-11-02 2021-09-30 13F ARCH CAP GROUP ORD G0450A105 105,636 4,600 4.55 4,034 2.54 1.0486
2021-07-28 2021-06-30 13F ARCH CAP GROUP ORD G0450A105 101,036 875 0.87 3,934 2.37 1.0299
2021-05-10 2021-03-31 13F ARCH CAP GROUP ORD G0450A105 100,161 364 0.36 3,843 6.78 1.0841
2021-02-09 2020-12-31 13F ARCH CAP GROUP ORD G0450A105 99,797 -3,010 -2.93 3,599 19.65 1.1044
2020-11-12 2020-09-30 13F ARCH CAP GROUP ORD G0450A105 102,807 8,435 8.94 3,008 11.24 1.0366
2020-08-11 2020-06-30 13F ARCH CAP GROUP ORD G0450A105 94,372 -3,300 -3.38 2,704 -2.70 1.0903
2020-05-04 2020-03-31 13F ARCH CAP GROUP ORD G0450A105 97,672 1,580 1.64 2,779 -32.56 1.2688
2020-01-21 2019-12-31 13F ARCH CAP GROUP ORD G0450A105 96,092 -130 -0.14 4,121 2.00 1.5740
2019-11-01 2019-09-30 13F ARCH CAP GROUP ORD G0450A105 96,222 0 0.00 4,040 13.23 1.6781
2019-07-12 2019-06-30 13F ARCH CAP GROUP ORD G0450A105 96,222 -3,180 -3.20 3,568 11.05 1.5090
2019-04-16 2019-03-31 13F ARCH CAP GROUP ORD G0450A105 99,402 2,400 2.47 3,213 23.96 1.4349
2019-01-22 2018-12-31 13F ARCH CAP GROUP ORD G0450A105 97,002 -1,958 -1.98 2,592 -12.14 1.3183
2018-10-26 2018-09-30 13F ARCH CAP GROUP ORD G0450A105 98,960 700 0.71 2,950 13.46 1.3482
2018-07-27 2018-06-30 13F ARCH CAP GROUP ORD G0450A105 98,260 67,615 220.64 2,600 -0.88 1.3237
2018-04-13 2018-03-31 13F ARCH CAP GROUP ORD G0450A105 30,645 -105 -0.34 2,623 -6.02 1.3632
2018-01-31 2017-12-31 13F/A-1 ARCH CAP GROUP ORD G0450A105 30,750 2,405 8.48 2,791 -0.36 1.4709
2018-01-23 2017-12-31 13F ARCH CAP GROUP ORD G0450A105 27,100 -1,245 2,483
2017-10-16 2017-09-30 13F ARCH CAP GROUP ORD G0450A105 28,345 -200 -0.70 2,801 4.83 1.6159
2017-07-12 2017-06-30 13F ARCH CAP GROUP ORD G0450A105 28,545 0 0.00 2,672 -0.85 1.6491
2017-04-06 2017-03-31 13F ARCH CAP GROUP ORD G0450A105 28,545 -4,250 -12.96 2,695 -4.77 1.7856
2017-01-06 2016-12-31 13F ARCH CAP GROUP ORD G0450A105 32,795 -1,300 -3.81 2,830 4.74 1.9509
2016-11-14 2016-09-30 13F ARCH CAP GROUP ORD G0450A105 34,095 -530 -1.53 2,702 8.38 1.9419
2016-07-12 2016-06-30 13F ARCH CAP GROUP ORD G0450A105 34,625 -1,400 -3.89 2,493 -2.66 1.8565
2016-04-15 2016-03-31 13F ARCH CAP GROUP ORD G0450A105 36,025 -1,525 -4.06 2,561 -2.07 1.9538
2016-01-26 2015-12-31 13F ARCH CAP GROUP ORD G0450A105 37,550 -100 -0.27 2,615 -6.31 2.0746
2015-10-19 2015-09-30 13F ARCH CAP GROUP ORD G0450A105 37,650 -800 -2.08 2,791 8.39 2.2825
2015-07-30 2015-06-30 13F ARCH CAP GROUP ORD G0450A105 38,450 500 1.32 2,575 10.14 1.9658
2015-04-24 2015-03-31 13F ARCH CAP GROUP ORD G0450A105 37,950 37,950 2,338 1.8022
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.