Mesabi Trust
US ˙ NYSE ˙ US5906721015

SecurityMSB / Mesabi Trust
InstitutionMorgan Stanley
Latest Disclosed Ownership114,045 shares
Latest Disclosed Value $ 3,592,418
Morgan Stanley reports 4.88% increase in ownership of MSB / Mesabi Trust

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 114,045 shares of Mesabi Trust (US:MSB) valued at $3,592,418 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 108,742 shares of Mesabi Trust. This represents a change in shares of 4.88% during the quarter. The current value of the position is $2,910,428 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 MESABI TR CTF BEN INT 590672101 114,045 5,303 4.88 3,592 -14.23 0.0002
2026-05-27 2025-12-31 13F/A-1 MESABI TR CTF BEN INT 590672101 108,742 4,817 4.64 4,189 37.72 0.0003
2026-02-13 2025-12-31 13F MESABI TR CTF BEN INT 590672101 108,742 4,817 4,189 0.0003
2026-05-27 2025-09-30 13F/A-1 MESABI TR CTF BEN INT 590672101 103,925 -21,846 -17.37 3,042 0.93 0.0002
2025-11-14 2025-09-30 13F MESABI TR CTF BEN INT 590672101 103,925 -21,846 3,042 0.0002
2025-08-15 2025-06-30 13F MESABI TR CTF BEN INT 590672101 125,771 36,513 40.91 3,013 24.15 0.0002
2025-05-15 2025-03-31 13F MESABI TR CTF BEN INT 590672101 89,258 -19,391 -17.85 2,428 -20.53 0.0002
2025-05-15 2024-12-31 13F/A-1 MESABI TR CTF BEN INT 590672101 108,649 5,709 5.55 3,054 31.02 0.0002
2025-02-14 2024-12-31 13F MESABI TR CTF BEN INT 590672101 108,649 5,709 3,054 0.0002
2025-05-14 2024-09-30 13F/A-2 MESABI TR CTF BEN INT 590672101 102,940 2,862 2.86 2,332 35.21 0.0002
2025-02-14 2024-09-30 13F/A-1 MESABI TR CTF BEN INT 590672101 102,940 2,862 2,332 0.0002
2024-11-14 2024-09-30 13F MESABI TR CTF BEN INT 590672101 102,940 2,862 2,332 0.0000
2025-05-14 2024-06-30 13F/A-2 MESABI TR CTF BEN INT 590672101 100,078 -14,747 -12.84 1,724 -15.16 0.0001
2024-10-17 2024-06-30 13F/A-1 MESABI TR CTF BEN INT 590672101 100,078 -14,747 1,724 0.0001
2024-08-14 2024-06-30 13F MESABI TR CTF BEN INT 590672101 100,078 -14,747 1,724 0.0001
2024-10-17 2024-03-31 13F/A-2 MESABI TR CTF BEN INT 590672101 114,825 -65,881 -36.46 2,032 -45.07 0.0002
2024-08-16 2024-03-31 13F/A-1 MESABI TR CTF BEN INT 590672101 114,825 -65,881 2,032 0.0000
2024-05-15 2024-03-31 13F MESABI TR CTF BEN INT 590672101 114,825 -65,881 2,032 0.0002
2024-08-16 2023-12-31 13F/A-1 MESABI TR CTF BEN INT 590672101 180,706 10,889 6.41 3,699 8.54 0.0003
2024-02-13 2023-12-31 13F MESABI TR CTF BEN INT 590672101 180,706 10,889 3,699 0.0003
2023-11-15 2023-09-30 13F MESABI TR CTF BEN INT 590672101 169,817 -5,934 -3.38 3,408 -4.99 0.0003
2023-08-14 2023-06-30 13F MESABI TR CTF BEN INT 590672101 175,751 14,187 8.78 3,587 -11.82 0.0004
2023-05-15 2023-03-31 13F MESABI TR CTF BEN INT 590672101 161,564 -6,347 -3.78 4,068 34.48 0.0004
2023-02-14 2022-12-31 13F MESABI TR CTF BEN INT 590672101 167,911 12,486 8.03 3,026 -9.51 0.0003
2022-11-14 2022-09-30 13F MESABI TR CTF BEN INT 590672101 155,425 21,474 16.03 3,343 1.77 0.0005
2022-10-27 2022-06-30 13F/A-1 MESABI TR CTF BEN INT 590672101 133,951 30,299 29.23 3,285 18.98 0.0004
2022-08-15 2022-06-30 13F MESABI TR CTF BEN INT 590672101 133,951 30,299 3,285 0.0004
2022-10-27 2022-03-31 13F/A-1 MESABI TR CTF BEN INT 590672101 103,652 5,510 5.61 2,761 6.48 0.0004
2022-05-13 2022-03-31 13F MESABI TR CTF BEN INT 590672101 103,652 5,510 2,761 0.0004
2022-02-14 2021-12-31 13F MESABI TR CTF BEN INT 590672101 98,142 21,077 27.35 2,593 13.28 0.0003
2021-11-15 2021-09-30 13F MESABI TR CTF BEN INT 590672101 77,065 -19,565 -20.25 2,289 -33.07 0.0003
2021-08-23 2021-06-30 13F/A-1 MESABI TR CTF BEN INT 590672101 96,630 19,958 26.03 3,420 48.31 0.0005
2021-08-16 2021-06-30 13F MESABI TR CTF BEN INT 590672101 96,630 19,958 3,420 0.0001
2021-05-17 2021-03-31 13F MESABI TR CTF BEN INT 590672101 76,672 22,376 41.21 2,306 51.31 0.0003
2021-02-16 2020-12-31 13F MESABI TR CTF BEN INT 590672101 54,296 10,943 25.24 1,524 65.65 0.0002
2020-11-13 2020-09-30 13F MESABI TR CTF BEN INT 590672101 43,353 -29,351 -40.37 920 -27.73 0.0002
2020-08-14 2020-06-30 13F MESABI TR CTF BEN INT 590672101 72,704 -35,969 -33.10 1,273 -18.03 0.0003
2020-05-26 2020-03-31 13F/A-1 MESABI TR CTF BEN INT 590672101 108,673 -63,703 -36.96 1,553 -61.73 0.0004
2020-05-15 2020-03-31 13F MESABI TR CTF BEN INT 590672101 108,673 -63,703 1,553 119.3028
2020-02-14 2019-12-31 13F MESABI TR CTF BEN INT 590672101 172,376 -4,826 -2.72 4,058 -4.27 0.0009
2019-11-14 2019-09-30 13F MESABI TR CTF BEN INT 590672101 177,202 23,808 15.52 4,239 -6.47 0.0011
2019-08-14 2019-06-30 13F MESABI TR CTF BEN INT 590672101 153,394 -28,991 -15.90 4,532 -15.16 0.0012
2019-05-15 2019-03-31 13F MESABI TR CTF BEN INT 590672101 182,385 48,955 36.69 5,342 69.00 0.0015
2019-02-14 2018-12-31 13F MESABI TR CTF BEN INT 590672101 133,430 21,304 19.00 3,161 6.36 0.0009
2019-04-23 2018-09-30 13F/A-2 MESABI TR CTF BEN INT 590672101 112,126 11,702 11.65 2,972 20.52 0.0007
2018-11-20 2018-09-30 13F/A-1 MESABI TR CTF BEN INT 590672101 112,126 0 2,972 0.0007
2018-11-14 2018-09-30 13F MESABI TR CTF BEN INT 590672101 112,126 11,702 2,972
2019-04-23 2018-06-30 13F/A-1 MESABI TR CTF BEN INT 590672101 100,424 -95,254 -48.68 2,466 -51.06 0.0007
2018-08-14 2018-06-30 13F MESABI TR CTF BEN INT 590672101 100,424 -95,254 2,466
2019-04-23 2018-03-31 13F/A-1 MESABI TR CTF BEN INT 590672101 195,678 51,309 35.54 5,039 38.78 0.0014
2018-05-14 2018-03-31 13F MESABI TR CTF BEN INT 590672101 195,678 51,309 5,039
2019-04-23 2017-12-31 13F/A-1 MESABI TR CTF BEN INT 590672101 144,369 79,380 122.14 3,631 143.04 0.0010
2018-02-14 2017-12-31 13F MESABI TR CTF BEN INT 590672101 144,369 79,380 3,631
2017-11-14 2017-09-30 13F MESABI TR CTF BEN INT 590672101 64,989 20,129 44.87 1,494 144.12 0.0004
2017-08-11 2017-06-30 13F MESABI TR CTF BEN INT 590672101 44,860 17,429 63.54 612 48.91 0.0002
2017-05-22 2017-03-31 13F/A-1 MESABI TR CTF BEN INT 590672101 27,431 19,350 239.45 411 377.91 0.0001
2017-05-12 2017-03-31 13F MESABI TR CTF BEN INT 590672101 27,431 411
2017-02-22 2016-12-31 13F/A-1 MESABI TR CTF BEN INT 590672101 8,081 912 12.72 86 30.30 0.0000
2017-02-13 2016-12-31 13F MESABI TR CTF BEN INT 590672101 8,081 86
2016-11-10 2016-09-30 13F MESABI TR CTF BEN INT 590672101 7,169 -831 -10.39 66 -23.26 0.0000
2016-08-12 2016-06-30 13F MESABI TR CTF BEN INT 590672101 8,000 -4,548 -36.24 86 14.67 0.0000
2016-05-12 2016-03-31 13F MESABI TR CTF BEN INT 590672101 12,548 -2,180 -14.80 75 11.94 0.0000
2016-02-09 2015-12-31 13F MESABI TR CTF BEN INT 590672101 14,728 -6,578 -30.87 67 -73.73 0.0000
2016-02-08 2015-09-30 13F/A-1 MESABI TR CTF BEN INT 590672101 21,306 -4,681 -18.01 255 -27.97 0.0001
2015-11-09 2015-09-30 13F MESABI TR CTF BEN INT 590672101 21,306 255
2015-08-12 2015-06-30 13F MESABI TR CTF BEN INT 590672101 25,987 -20,005 -43.50 354 -42.25 0.0001
2015-05-14 2015-03-31 13F MESABI TR CTF BEN INT 590672101 45,992 3,150 7.35 613 -17.16 0.0002
2015-02-13 2014-12-31 13F MESABI TR CTF BEN INT 590672101 42,842 -5,790 -11.91 740 -20.34 0.0003
2014-12-16 2014-09-30 13F/A-1 MESABI TR CTF BEN INT 590672101 48,632 12,287 33.81 929 21.44 0.0004
2014-11-14 2014-09-30 13F MESABI TR CTF BEN INT 590672101 48,632 929
2014-05-13 2014-03-31 13F MESABI TR CTF BEN INT 590672101 36,345 -759 -2.05 765 -7.38 0.0003
2014-02-13 2013-12-31 13F MESABI TR CTF BEN INT 590672101 37,104 -16,498 -30.78 826 -29.58 0.0004
2013-11-13 2013-09-30 13F MESABI TR COM ST COM 590672101 53,602 5,483 11.39 1,173 36.40 0.0006
2013-08-08 2013-06-30 13F MESABI TR COM ST COM 590672101 48,119 48,119 860 0.0004
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.