Arch Capital Group Ltd.
US ˙ NasdaqGS ˙ BMG0450A1053

SecurityACGL / Arch Capital Group Ltd.
InstitutionFirst Manhattan Co
Latest Disclosed Ownership9,490 shares
Latest Disclosed Value $ 910,945
First Manhattan Co ownership in ACGL / Arch Capital Group Ltd.

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 9,490 shares of Arch Capital Group Ltd. (US:ACGL) valued at $910,945 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,490 shares of Arch Capital Group Ltd.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $834,076 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)
2026-05-15 2026-03-31 13F ARCH CAP GROUP ORD G0450A105 9,490 0 0.00 911 0.00 0.0025
2026-02-17 2025-12-31 13F ARCH CAP GROUP ORD G0450A105 9,490 34 0.36 910 6.18 0.0024
2025-11-14 2025-09-30 13F ARCH CAP GROUP ORD G0450A105 9,456 0 0.00 858 -0.35 0.0023
2025-08-14 2025-06-30 13F ARCH CAP GROUP ORD G0450A105 9,456 0 0.00 861 -5.39 0.0024
2025-05-15 2025-03-31 13F ARCH CAP GROUP ORD G0450A105 9,456 3,598 61.42 909 68.33 0.0027
2025-02-14 2024-12-31 13F ARCH CAP GROUP ORD G0450A105 5,858 152 2.66 541 -15.36 0.0016
2024-11-14 2024-09-30 13F ARCH CAP GROUP ORD G0450A105 5,706 0 0.00 638 10.96 0.0019
2024-08-15 2024-06-30 13F/A-1 ARCH CAP GROUP ORD G0450A105 5,706 0 0.00 576 9.11 0.0018
2024-08-14 2024-06-30 13F ARCH CAP GROUP ORD G0450A105 5,706 0 576 0.0018
2024-05-15 2024-03-31 13F ARCH CAP GROUP ORD G0450A105 5,706 -3 -0.05 527 24.29 0.0017
2024-02-13 2023-12-31 13F ARCH CAP GROUP ORD G0450A105 5,709 3 0.05 424 -6.61 0.0015
2023-11-14 2023-09-30 13F ARCH CAP GROUP ORD G0450A105 5,706 0 0.00 455 6.32 0.0017
2023-08-14 2023-06-30 13F ARCH CAP GROUP ORD G0450A105 5,706 0 0.00 427 10.34 0.0016
2023-05-15 2023-03-31 13F ARCH CAP GROUP ORD G0450A105 5,706 -1,050 -15.54 387 -8.73 0.0015
2023-02-14 2022-12-31 13F ARCH CAP GROUP ORD G0450A105 6,756 0 0.00 424 38.11 0.0016
2022-11-14 2022-09-30 13F ARCH CAP GROUP ORD G0450A105 6,756 0 0.00 307 0.00 0.0013
2022-08-15 2022-06-30 13F ARCH CAP GROUP ORD G0450A105 6,756 0 0.00 307 -6.12 0.0012
2022-05-16 2022-03-31 13F ARCH CAP GROUP ORD G0450A105 6,756 3,825 130.50 327 151.54 0.0011
2022-02-14 2021-12-31 13F ARCH CAP GROUP ORD G0450A105 2,931 0 0.00 130 17.12 0.0004
2021-11-15 2021-09-30 13F ARCH CAP GROUP ORD G0450A105 2,931 0 0.00 111 -2.63 0.0004
2021-08-16 2021-06-30 13F ARCH CAP GROUP ORD G0450A105 2,931 -649 -18.13 114 -16.79 0.0004
2021-05-14 2021-03-31 13F ARCH CAP GROUP ORD G0450A105 3,580 649 22.14 137 30.48 0.0006
2021-02-16 2020-12-31 13F ARCH CAP GROUP ORD G0450A105 2,931 1,050 55.82 105 90.91 0.0005
2020-11-12 2020-09-30 13F ARCH CAP GROUP ORDINARY G0450A105 1,881 0 0.00 55 3.77 0.0003
2020-08-14 2020-06-30 13F ARCH CAP GROUP ORDINARY G0450A105 1,881 -183 -8.87 53 -8.62 0.0003
2020-05-06 2020-03-31 13F ARCH CAP GROUP ORDINARY G0450A105 2,064 0 0.00 58 -34.09 0.0004
2020-02-13 2019-12-31 13F ARCH CAP GROUP ORDINARY G0450A105 2,064 0 0.00 88 2.33 0.0004
2019-11-13 2019-09-30 13F ARCH CAP GROUP ORDINARY G0450A105 2,064 0 0.00 86 13.16 0.0005
2019-08-16 2019-06-30 13F ARCH CAP GROUP ORDINARY G0450A105 2,064 0 0.00 76 15.15 0.0004
2019-04-12 2019-03-31 13F ARCH CAP GROUP ORDINARY G0450A105 2,064 0 0.00 66 20.00 0.0004
2019-01-30 2018-12-31 13F ARCH CAP GROUP ORDINARY G0450A105 2,064 183 9.73 55 -1.79 0.0003
2018-10-15 2018-09-30 13F ARCH CAP GROUP ORDINARY G0450A105 1,881 0 0.00 56 14.29 0.0003
2018-08-01 2018-06-30 13F ARCH CAP GROUP ORDINARY G0450A105 1,881 1,254 200.00 49 -7.55 0.0003
2018-04-20 2018-03-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 53 -5.36 0.0003
2018-01-22 2017-12-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 56 -8.20 0.0003
2017-10-25 2017-09-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 61 5.17 0.0003
2017-08-10 2017-06-30 13F/A-2 ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 58 -1.69 0.0003
2017-08-01 2017-06-30 13F/A-1 ARCH CAP GROUP ORDINARY G0450A105 627 0 58 0.0003
2017-07-28 2017-06-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 58
2017-04-25 2017-03-31 13F/A-1 ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 59 9.26 0.0004
2017-04-24 2017-03-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 49
2017-01-25 2016-12-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 54 10.20 0.0003
2016-10-20 2016-09-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 49 8.89 0.0003
2016-07-14 2016-06-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 45 2.27 0.0003
2016-04-22 2016-03-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 44 2.33 0.0003
2016-01-20 2015-12-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 43 -6.52 0.0003
2015-10-26 2015-09-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 46 12.20 0.0003
2015-07-17 2015-06-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 41 7.89 0.0002
2015-04-30 2015-03-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 38 2.70 0.0002
2015-01-20 2014-12-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 37 8.82 0.0002
2014-10-23 2014-09-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 34 -5.56 0.0002
2014-08-14 2014-06-30 13F/A-1 ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 36 0.00 0.0002
2014-05-16 2014-03-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 36 -2.70 0.0002
2014-02-04 2013-12-31 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 37 12.12 0.0002
2013-10-29 2013-09-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 0 0.00 33 -2.94 0.0002
2013-08-13 2013-06-30 13F ARCH CAP GROUP ORDINARY G0450A105 627 627 34 0.0002
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.