Northern Dynasty Minerals Ltd.
US ˙ NYSEAM ˙ CA66510M2040

SecurityNAK / Northern Dynasty Minerals Ltd.
InstitutionGrimes & Company, Inc.
Latest Disclosed Ownership189,750 shares
Latest Disclosed Value $ 265,650
Grimes & Company, Inc. ownership in NAK / Northern Dynasty Minerals Ltd.

On April 21, 2026 - Grimes & Company, Inc. filed a 13F-HR form disclosing ownership of 189,750 shares of Northern Dynasty Minerals Ltd. (US:NAK) valued at $265,650 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 189,750 shares of Northern Dynasty Minerals Ltd.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $426,938 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)
2026-04-21 2026-03-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 189,750 0 0.00 266 -28.95 0.0074
2026-02-03 2025-12-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 189,750 0 0.00 374 64.32 0.0089
2025-10-27 2025-09-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 189,750 -109,200 -36.53 228 -43.25 0.0056
2025-07-22 2025-06-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 298,950 0 0.00 401 16.62 0.0109
2025-04-17 2025-03-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 298,950 0 0.00 344 98.27 0.0106
2025-01-21 2024-12-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 298,950 0 0.00 174 74.75 0.0050
2024-10-22 2024-09-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 298,950 0 0.00 99 7.61 0.0027
2024-07-22 2024-06-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 298,950 0 0.00 93 -3.16 0.0028
2024-04-17 2024-03-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 298,950 -20,000 -6.27 95 -7.77 0.0029
2024-01-24 2023-12-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 103 0.00 0.0034
2023-10-19 2023-09-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 104 35.53 0.0040
2023-07-19 2023-06-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 77 0.00 0.0027
2023-04-20 2023-03-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 76 8.57 0.0031
2023-01-25 2022-12-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 70 -10.26 0.0030
2022-10-28 2022-09-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 78 -6.02 0.0041
2022-07-22 2022-06-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 83 -37.12 0.0042
2022-05-06 2022-03-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 132 26.92 0.0062
2022-02-01 2021-12-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 104 -29.25 0.0048
2021-11-08 2021-09-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 147 -6.37 0.0064
2021-08-04 2021-06-30 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 0 0.00 157 -22.28 0.0068
2021-05-12 2021-03-31 13F NORTHERN DYNASTY MINERALS LT COM NEW 66510M204 318,950 6,085 1.94 202 100.00 0.0097
2021-02-02 2020-12-31 13F Northern Dynasty Minerals COM 66510M204 312,865 -57,000 -15.41 101 -72.18 0.0052
2020-11-12 2020-09-30 13F Northern Dynasty Minerals COM 66510M204 369,865 14,450 4.07 363 -28.54 0.0232
2020-07-31 2020-06-30 13F Northern Dynasty Minerals COM 66510M204 355,415 83,200 30.56 508 383.81 0.0353
2020-05-05 2020-03-31 13F Northern Dynasty Minerals COM 66510M204 272,215 0 0.00 105 -10.26 0.0096
2020-02-05 2019-12-31 13F Northern Dynasty Minerals COM 66510M204 272,215 -25,000 -8.41 117 -33.14 0.0077
2019-11-05 2019-09-30 13F Northern Dynasty Minerals COM 66510M204 297,215 0 0.00 175 -2.23 0.0125
2019-07-30 2019-06-30 13F Northern Dynasty Minerals COM 66510M204 297,215 0 0.00 179 0.00 0.0136
2019-05-02 2019-03-31 13F Northern Dynasty Minerals COM 66510M204 297,215 113,000 61.34 179 70.48 0.0140
2019-02-01 2018-12-31 13F Northern Dynasty Minerals COM 66510M204 184,215 1,315 0.72 105 2.94 0.0102
2018-11-09 2018-09-30 13F Northern Dynasty Minerals COM 66510M204 182,900 0 0.00 102 3.03 0.0082
2018-08-10 2018-06-30 13F Northern Dynasty Minerals COM 66510M204 182,900 0 0.00 99 -40.36 0.0088
2018-05-07 2018-03-31 13F Northern Dynasty Minerals COM 66510M204 182,900 169,500 1,264.93 166 591.67 0.0161
2018-02-05 2017-12-31 13F Northern Dynasty Minerals COM 66510M204 13,400 0 0.00 24 0.00 0.0023
2017-11-03 2017-09-30 13F Northern Dynasty Minerals COM 66510M204 13,400 0 0.00 24 26.32 0.0026
2017-07-18 2017-06-30 13F Northern Dynasty Minerals COM 66510M204 13,400 0 0.00 19 0.00 0.0021
2017-05-01 2017-03-31 13F Northern Dynasty Minerals COM 66510M204 13,400 3,000 28.85 19 -13.64 0.0021
2017-01-24 2016-12-31 13F Northern Dynasty Minerals COM 66510M204 10,400 10,400 22 0.0026
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.