Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionMariner, LLC
Latest Disclosed Ownership3,562,752 shares
Latest Disclosed Value $ 484,252,947
Mariner, LLC reports 1.16% increase in ownership of GLW / Corning Incorporated

On May 13, 2026 - Mariner, LLC filed a 13F-HR form disclosing ownership of 3,562,752 shares of Corning Incorporated (MX:GLW) valued at $484,252,947 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,521,902 shares of Corning Incorporated. This represents a change in shares of 1.16% 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)
2026-05-13 2026-03-31 13F CORNING COM 219350105 3,562,752 40,850 1.16 484,253 57.03 0.5654
2026-02-13 2025-12-31 13F CORNING COM 219350105 3,521,902 -315,244 -8.22 308,390 -2.01 0.3672
2025-11-14 2025-09-30 13F CORNING COM 219350105 3,837,146 -518,097 -11.90 314,717 37.42 0.4067
2025-08-14 2025-06-30 13F CORNING COM 219350105 4,355,243 200,425 4.82 229,018 20.40 0.3306
2025-05-15 2025-03-31 13F CORNING COM 219350105 4,154,818 285,460 7.38 190,210 3.45 0.3165
2025-02-13 2024-12-31 13F CORNING COM 219350105 3,869,358 2,215,840 134.01 183,867 146.29 0.3088
2024-11-13 2024-09-30 13F CORNING COM 219350105 1,653,518 198,603 13.65 74,654 32.08 0.1325
2024-08-13 2024-06-30 13F CORNING COM 219350105 1,454,915 399,639 37.87 56,523 62.51 0.1096
2024-05-15 2024-03-31 13F CORNING COM 219350105 1,055,276 44,670 4.42 34,782 13.02 0.0719
2024-02-14 2023-12-31 13F CORNING COM 219350105 1,010,606 -19,266 -1.87 30,773 -1.93 0.0730
2023-11-13 2023-09-30 13F CORNING COM 219350105 1,029,872 51,320 5.24 31,380 -8.48 0.0842
2023-08-11 2023-06-30 13F CORNING COM 219350105 978,552 93,745 10.59 34,288 110,506.45 0.0916
2023-05-15 2023-03-31 13F CORNING COM 219350105 884,807 125,339 16.50 31 -99.87 0.0907
2023-02-14 2022-12-31 13F CORNING COM 219350105 759,468 98,293 14.87 24,257 26.42 0.0780
2022-11-10 2022-09-30 13F CORNING COM 219350105 661,175 544,822 468.25 19,188 423.40 0.0767
2022-08-15 2022-06-30 13F CORNING COM 219350105 116,353 12,659 12.21 3,666 -4.21 0.0151
2022-05-13 2022-03-31 13F CORNING COM 219350105 103,694 22,885 28.32 3,827 27.19 0.0144
2022-02-14 2021-12-31 13F CORNING COM 219350105 80,809 3,489 4.51 3,009 6.66 0.0127
2021-11-15 2021-09-30 13F CORNING COM 219350105 77,320 26,367 51.75 2,821 35.36 0.0147
2021-08-24 2021-06-30 13F CORNING COM 219350105 50,953 5,210 11.39 2,084 4.72 0.0129
2021-05-07 2021-03-31 13F CORNING COM 219350105 45,743 4,674 11.38 1,990 34.55 0.0139
2021-02-16 2020-12-31 13F CORNING COM 219350105 41,069 -1,986 -4.61 1,479 6.02 0.0113
2020-11-13 2020-09-30 13F CORNING COM 219350105 43,055 -5,844 -11.95 1,395 10.10 0.0131
2020-08-14 2020-06-30 13F CORNING COM 219350105 48,899 15,344 45.73 1,267 83.09 0.0127
2020-05-14 2020-03-31 13F CORNING COM 219350105 33,555 157 0.47 692 -28.81 0.0086
2020-02-13 2019-12-31 13F CORNING COM 219350105 33,398 -2,214 -6.22 972 -4.33 0.0101
2019-11-13 2019-09-30 13F CORNING COM 219350105 35,612 -6,671 -15.78 1,016 -27.69 0.0122
2019-08-14 2019-06-30 13F CORNING COM 219350105 42,283 6,637 18.62 1,405 19.07 0.0168
2019-05-15 2019-03-31 13F CORNING COM 219350105 35,646 673 1.92 1,180 11.74 0.0168
2019-02-13 2018-12-31 13F CORNING COM 219350105 34,973 15,205 76.92 1,056 51.29 0.0188
2018-11-14 2018-09-30 13F CORNING COM 219350105 19,768 5,341 37.02 698 75.82 0.0179
2018-08-14 2018-06-30 13F CORNING COM 219350105 14,427 14,427 -27.02 397 -43.12 0.0113
2016-02-16 2015-12-31 13F CORNING COM 219350105 0 -28,885 -100.00 0 -100.00
2015-11-16 2015-09-30 13F CORNING COM 219350105 28,885 2,100 7.84 495 -6.25 0.0220
2015-08-17 2015-06-30 13F Corning COS 219350105 26,785 26,785 528 0.0245
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.