Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionChelsea Counsel Co
Latest Disclosed Ownership61,941 shares
Latest Disclosed Value $ 8,422,118
Chelsea Counsel Co reports 14.65% decrease in ownership of GLW / Corning Incorporated

On June 4, 2026 - Chelsea Counsel Co filed a 13F-HR/A form disclosing ownership of 61,941 shares of Corning Incorporated (MX:GLW) valued at $8,422,118 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 24, 2026 disclosing 72,571 shares of Corning Incorporated. This represents a change in shares of -14.65% 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)
2026-06-04 2026-03-31 13F/A-1 CORNING COM 219350105 61,941 -10,630 -14.65 8,422 32.55 3.7090
2026-04-23 2026-03-31 13F CORNING COM 219350105 72,571 0 6,354 2.7064
2026-02-24 2025-12-31 13F CORNING COM 219350105 72,571 350 0.48 6,354 7.26 2.7290
2025-11-25 2025-09-30 13F CORNING COM 219350105 72,221 100 0.14 5,924 56.22 2.6307
2025-07-18 2025-06-30 13F CORNING COM 219350105 72,121 0 0.00 3,793 14.87 1.8807
2025-05-22 2025-03-31 13F CORNING COM 219350105 72,121 -150 -0.21 3,302 -3.87 1.7948
2025-02-27 2024-12-31 13F CORNING COM 219350105 72,271 -1,035 -1.41 3,434 3.78 1.7725
2024-11-21 2024-09-30 13F CORNING COM 219350105 73,306 -3,465 -4.51 3,310 10.97 1.6310
2024-11-21 2024-06-30 13F CORNING COM 219350105 76,771 -110 -0.14 2,983 17.73 1.4885
2024-06-17 2024-03-31 13F CORNING COM 219350105 76,881 -1,572 -2.00 2,534 6.07 1.4367
2024-02-21 2023-12-31 13F CORNING COM 219350105 78,453 -12,938 -14.16 2,389 -14.22 1.2672
2023-11-22 2023-09-30 13F CORNING COM 219350105 91,391 17,610 23.87 2,785 7.70 1.4326
2023-11-22 2023-06-30 13F CORNING COM 219350105 73,781 -2,615 -3.42 2,585 -4.08 1.2727
2023-05-19 2023-03-31 13F CORNING COM 219350105 76,396 -500 -0.65 2,695 9.73 1.3089
2023-02-23 2022-12-31 13F CORNING COM 219350105 76,896 -9,495 -10.99 2,456 -2.03 1.2266
2022-10-31 2022-09-30 13F CORNING COMMON 219350105 86,391 -3,000 -3.36 2,507 -10.97 1.5459
2022-08-01 2022-06-30 13F CORNING COMMON 219350105 89,391 -1,735 -1.90 2,816 -16.27 1.4467
2022-05-24 2022-03-31 13F CORNING COMMON 219350105 91,126 -890 -0.97 3,363 -1.81 1.4816
2022-05-23 2021-12-31 13F CORNING COMMON 219350105 92,016 3,490 3.94 3,425 6.04 1.4829
2022-02-10 2021-09-30 13F CORNING COMMON 219350105 88,526 1,580 1.82 3,230 -9.19 1.4688
2022-02-10 2021-06-30 13F CORNING COMMON 219350105 86,946 1,550 1.82 3,557 -4.28 1.6396
2022-02-10 2021-03-31 13F CORNING COMMON 219350105 85,396 2,280 2.74 3,716 24.20 1.8420
2022-03-08 2020-12-31 13F CORNING COMMON 219350105 83,116 57,084 219.28 2,992 254.50 1.5399
2022-05-06 2020-09-30 13F CORNING COMMON 219350105 26,032 7,062 37.23 844 71.89 0.3389
2022-05-06 2020-09-30 13F CORNING COMMON 219350105 6,237 202
2022-05-06 2020-06-30 13F CORNING COMMON 219350105 18,970 0 0.00 491 25.90 0.1880
2020-06-12 2020-03-31 13F CORNING COMMON 219350105 18,970 0 0.00 390 -29.35 0.3058
2020-03-23 2019-12-31 13F CORNING COMMON 219350105 18,970 4,790 33.78 552 36.63 0.3358
2020-03-27 2019-09-30 13F/A-1 CORNING COMMON 219350105 14,180 -7,466 -34.49 404 -43.89 0.2432
2020-03-23 2019-09-30 13F CORNING COMMON 219350105 21,396 -250 0
2019-12-09 2019-06-30 13F CORNING COMMON 219350105 21,646 -217 -0.99 720 -0.55 0.3853
2019-12-09 2019-03-31 13F CORNING COMMON 219350105 21,863 653 3.08 724 12.95 0.3901
2019-12-09 2018-12-31 13F CORNING COMMON 219350105 21,210 -297 -1.38 641 -15.55 0.3891
2019-12-09 2018-09-30 13F CORNING COMMON 219350105 21,507 9,157 74.15 759 123.24 0.3956
2018-10-03 2018-06-30 13F CORNING COMMON 219350105 12,350 0 0.00 340 -1.16 0.2024
2018-10-03 2018-03-31 13F CORNING COMMON 219350105 12,350 2,400 24.12 344 8.18 0.2212
2018-01-12 2017-12-31 13F CORNING COMMON 219350105 9,950 9,950 318 0.1698
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.