Core Natural Resources, Inc.
US ˙ NYSE ˙ US20854L1089

SecurityCNR / Core Natural Resources, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership362,433 shares
Latest Disclosed Value $ 37,957,754
Morgan Stanley reports 8.59% decrease in ownership of CNR / Core Natural Resources, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 362,433 shares of Core Natural Resources, Inc. (US:CNR) valued at $37,957,608 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 396,500 shares of Core Natural Resources, Inc.. This represents a change in shares of -8.59% during the quarter. The current value of the position is $33,865,740 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 CORE NATURAL RESOURCES COM SHS 218937100 362,433 -34,067 -8.59 37,958 8.16 0.0023
2026-05-27 2025-12-31 13F/A-1 CORE NATURAL RESOURCES COM SHS 218937100 396,500 -28,598 -6.73 35,094 -1.11 0.0021
2026-02-13 2025-12-31 13F CORE NATURAL RESOURCES COM SHS 218937100 396,500 -28,598 35,094 0.0021
2026-05-27 2025-09-30 13F/A-1 CORE NATURAL RESOURCES COM SHS 218937100 425,098 -39,640 -8.53 35,487 9.49 0.0021
2025-11-14 2025-09-30 13F CORE NATURAL RESOURCES COM SHS 218937100 425,098 -39,640 35,487 0.0021
2025-08-15 2025-06-30 13F CORE NATURAL RESOURCES COM SHS 218937100 464,738 78,917 20.45 32,411 8.96 0.0021
2025-05-15 2025-03-31 13F CORE NATURAL RESOURCES COM SHS 218937100 385,821 -1,575,708 -80.33 29,747 -38.08 0.0021
2022-10-27 2022-06-30 13F/A-1 CORNERSTONE BLDG BRANDS COM 21925D109 1,961,529 1,440,696 276.61 48,038 279.27 0.0062
2022-08-15 2022-06-30 13F CORNERSTONE BLDG BRANDS COM 21925D109 1,961,529 1,440,696 48,038 0.0062
2022-10-27 2022-03-31 13F/A-1 CORNERSTONE BLDG BRANDS COM 21925D109 520,833 179,420 52.55 12,666 112.70 0.0017
2022-05-13 2022-03-31 13F CORNERSTONE BLDG BRANDS COM 21925D109 520,833 179,420 12,666 0.0017
2022-02-14 2021-12-31 13F CORNERSTONE BLDG BRANDS COM 21925D109 341,413 33,107 10.74 5,955 32.19 0.0007
2021-11-15 2021-09-30 13F CORNERSTONE BLDG BRANDS COM 21925D109 308,306 -126,904 -29.16 4,505 -43.06 0.0006
2021-08-23 2021-06-30 13F/A-1 CORNERSTONE BLDG BRANDS COM 21925D109 435,210 -428,794 -49.63 7,912 -34.73 0.0010
2021-08-16 2021-06-30 13F CORNERSTONE BLDG BRANDS COM 21925D109 435,210 -428,794 7,912 0.0002
2021-05-17 2021-03-31 13F CORNERSTONE BLDG BRANDS COM 21925D109 864,004 -55,534 -6.04 12,122 42.06 0.0018
2021-02-16 2020-12-31 13F CORNERSTONE BLDG BRANDS COM 21925D109 919,538 889,877 3,000.16 8,533 3,500.42 0.0013
2020-11-13 2020-09-30 13F CORNERSTONE BLDG BRANDS COM 21925D109 29,661 -7,024 -19.15 237 7.24 0.0000
2020-08-14 2020-06-30 13F CORNERSTONE BLDG BRANDS COM 21925D109 36,685 -29,626 -44.68 221 -26.82 0.0000
2020-05-26 2020-03-31 13F/A-1 CORNERSTONE BLDG BRANDS COM 21925D109 66,311 -164,714 -71.30 302 -84.63 0.0001
2020-05-15 2020-03-31 13F CORNERSTONE BLDG BRANDS COM 21925D109 66,311 -164,714 302 23.1999
2020-02-14 2019-12-31 13F CORNERSTONE BLDG BRANDS COM 21925D109 231,025 -361,525 -61.01 1,965 -45.19 0.0005
2019-11-14 2019-09-30 13F CORNERSTONE BLDG BRANDS COM 21925D109 592,550 -436,068 -42.39 3,585 -40.22 0.0009
2019-08-14 2019-06-30 13F CORNERSTONE BLDG BRANDS COM 21925D109 1,028,618 1,028,618 5,997 0.0016
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.