Denison Mines Corp.
US ˙ NYSEAM ˙ CA2483561072

SecurityDNN / Denison Mines Corp.
InstitutionMackenzie Financial Corp
Latest Disclosed Ownership1,037,298 shares
Latest Disclosed Value $ 3,675,612
Mackenzie Financial Corp reports 5.50% increase in ownership of DNN / Denison Mines Corp.

On May 13, 2026 - Mackenzie Financial Corp filed a 13F-HR form disclosing ownership of 1,037,298 shares of Denison Mines Corp. (US:DNN) valued at $3,661,662 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 983,206 shares of Denison Mines Corp.. This represents a change in shares of 5.50% during the quarter. The current value of the position is $3,537,186 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)
2026-05-13 2026-03-31 13F DENISON MINES COM 248356107 1,037,298 54,092 5.50 3,676 41.73 0.0044
2026-02-18 2025-12-31 13F DENISON MINES COM 248356107 983,206 411,396 71.95 2,593 64.84 0.0031
2025-11-13 2025-09-30 13F DENISON MINES COM 248356107 571,810 57,864 11.26 1,573 67.34 0.0019
2025-08-13 2025-06-30 13F DENISON MINES COM 248356107 513,946 28,972 5.97 940 48.50 0.0012
2025-05-07 2025-03-31 13F DENISON MINES COM 248356107 484,974 34,727 7.71 634 -22.43 0.0009
2025-05-02 2024-12-31 13F/A-2 DENISON MINES COM 248356107 450,247 17,087 3.94 817 3.68 0.0011
2025-02-20 2024-12-31 13F/A-1 DENISON MINES COM 248356107 450,247 17,087 817 0.0011
2025-02-14 2024-12-31 13F Denison Mines Common Stock 248356107 450,247 17,087 823 0.0012
2024-11-13 2024-09-30 13F DENISON MINES COM 248356107 433,160 1,275 0.30 788 -9.02 0.0011
2024-08-14 2024-06-30 13F DENISON MINES COM 248356107 431,885 2,549 0.59 865 2.98 0.0013
2024-05-10 2024-03-31 13F DENISON MINES COM 248356107 429,336 42,246 10.91 840 23.89 0.0012
2024-01-30 2023-12-31 13F DENISON MINES COM 248356107 387,090 4,159 1.09 678 12.44 0.0010
2023-10-25 2023-09-30 13F DENISON MINES COM 248356107 382,931 3,966 1.05 603 27.22 0.0010
2023-08-03 2023-06-30 13F DENISON MINES COM 248356107 378,965 30,582 8.78 475 25.40 0.0007
2023-04-24 2023-03-31 13F DENISON MINES COM 248356107 348,383 5,934 1.73 379 -3.32 0.0006
2023-02-14 2022-12-31 13F DENISON MINES COM 248356107 342,449 9,267 2.78 391 0.77 0.0007
2022-10-07 2022-09-30 13F Denison Mines Common Stock 248356107 333,182 22,035 7.08 388 26.38 0.0007
2022-08-10 2022-06-30 13F DENISON MINES COM 248356107 311,147 -57,703 -15.64 307 -49.09 0.0005
2022-05-13 2022-03-31 13F DENISON MINES COM 248356107 368,850 126,543 52.22 603 81.08 0.0008
2022-02-14 2021-12-31 13F DENISON MINES COM 248356107 242,307 85,055 54.09 333 46.05 0.0004
2021-11-08 2021-09-30 13F DENISON MINES COM 248356107 157,252 13,904 9.70 228 31.03 0.0003
2021-08-11 2021-06-30 13F DENISON MINES COM 248356107 143,348 94,928 196.05 174 228.30 0.0002
2021-05-14 2021-03-31 13F DENISON MINES COM 248356107 48,420 48,420 53 0.0001
2019-05-15 2019-03-31 13F DENISON MINES COM 248356107 0 -2,441,480 -100.00 0 -100.00
2019-02-06 2018-12-31 13F DENISON MINES COM 248356107 2,441,480 2,441,480 1,133 0.0030
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.