Arch Capital Group Ltd.
US ˙ NasdaqGS ˙ BMG0450A1053

SecurityACGL / Arch Capital Group Ltd.
InstitutionOMERS ADMINISTRATION Corp
Latest Disclosed Ownership44,271 shares
Latest Disclosed Value $ 4,249,573
OMERS ADMINISTRATION Corp reports 17.38% increase in ownership of ACGL / Arch Capital Group Ltd.

On May 15, 2026 - OMERS ADMINISTRATION Corp filed a 13F-HR form disclosing ownership of 44,271 shares of Arch Capital Group Ltd. (US:ACGL) valued at $4,249,573 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 37,715 shares of Arch Capital Group Ltd.. This represents a change in shares of 17.38% during the quarter. The current value of the position is $3,890,978 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 44,271 6,556 17.38 4,250 17.47 0.0273
2026-02-13 2025-12-31 13F ARCH CAP GROUP ORD G0450A105 37,715 3,389 9.87 3,618 16.15 0.0258
2025-11-14 2025-09-30 13F ARCH CAP GROUP ORD G0450A105 34,326 0 0.00 3,114 -0.35 0.0223
2025-08-13 2025-06-30 13F ARCH CAP GROUP ORD G0450A105 34,326 -10,700 -23.76 3,125 -27.83 0.0246
2025-05-14 2025-03-31 13F ARCH CAP GROUP ORD G0450A105 45,026 13,357 42.18 4,331 48.08 0.0379
2025-02-14 2024-12-31 13F ARCH CAP GROUP ORD G0450A105 31,669 -2,144 -6.34 2,925 -22.69 0.0256
2024-11-13 2024-09-30 13F ARCH CAP GROUP ORD G0450A105 33,813 -11,900 -26.03 3,783 -17.98 0.0348
2024-08-13 2024-06-30 13F ARCH CAP GROUP ORD G0450A105 45,713 45,713 4,612 0.0444
2017-11-13 2017-09-30 13F ARCH CAP GROUP ORD G0450A105 0 -23,900 -100.00 0 -100.00
2017-08-08 2017-06-30 13F ARCH CAP GROUP ORD G0450A105 23,900 23,900 2,230 0.0282
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.