McEwen Inc.
MX ˙ BMV ˙ US58039P3055
SecurityMX:MUX / McEwen Inc.
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership471,241 shares
Latest Disclosed Value $ 9,622,742
Marshall Wace, Llp reports 497.78% increase in ownership of MUX / McEwen Inc.

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 471,241 shares of McEwen Inc. (MX:MUX) valued at $9,622,742 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 78,832 shares of McEwen Inc.. This represents a change in shares of 497.78% during the quarter.

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)
2026-05-14 2026-03-31 13F MCEWEN COMMON STOCK 58039P305 471,241 392,409 497.78 9,623 559.49 0.0045
2026-02-13 2025-12-31 13F MCEWEN COMMON STOCK 58039P305 78,832 78,832 1,459 0.0013
2025-05-15 2025-03-31 13F MCEWEN MINING IN COMMON STOCK 58039P305 0 -36,085 -100.00 0 -100.00
2025-02-13 2024-12-31 13F MCEWEN MINING IN COMMON STOCK 58039P305 36,085 -4,895 -11.94 281 -26.51 0.0003
2024-11-14 2024-09-30 13F MCEWEN MINING IN COMMON STOCK 58039P305 40,980 17,618 75.41 381 78.04 0.0005
2024-08-14 2024-06-30 13F MCEWEN MINING IN COMMON STOCK 58039P305 23,362 23,362 214 0.0003
2024-02-14 2023-12-31 13F MCEWEN MINING IN COMMON STOCK 58039P305 0 -75,165 -100.00 0 -100.00
2023-11-14 2023-09-30 13F MCEWEN MINING IN COMMON STOCK 58039P305 75,165 60,550 414.30 489 364.76 0.0010
2023-08-14 2023-06-30 13F MCEWEN MINING IN COMMON STOCK 58039P305 14,615 14,615 105 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.