Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionTufton Capital Management
Latest Disclosed Ownership161,795 shares
Latest Disclosed Value $ 21,999
Tufton Capital Management reports 11.98% decrease in ownership of GLW / Corning Incorporated

On May 12, 2026 - Tufton Capital Management filed a 13F-HR form disclosing ownership of 161,795 shares of Corning Incorporated (MX:GLW) valued at $21,999 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 183,819 shares of Corning Incorporated. This represents a change in shares of -11.98% 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)
2026-05-12 2026-03-31 13F CORNING INC COM COM 219350105 161,795 -22,024 -11.98 22 31.25 4.0022
2026-01-28 2025-12-31 13F CORNING COM 219350105 183,819 -4,224 -2.25 16 6.67 2.8134
2025-10-31 2025-09-30 13F CORNING COM 219350105 188,043 -21,512 -10.27 15 36.36 2.7496
2025-08-05 2025-06-30 13F CORNING COM 219350105 209,555 -8,353 -3.83 11 -99.89 2.0953
2025-05-06 2025-03-31 13F CORNING COM 219350105 217,908 -2,402 -1.09 9,976 -4.72 1.9216
2025-02-05 2024-12-31 13F CORNING COM 219350105 220,310 -2,624 -1.18 10,469 4.01 1.9802
2024-11-08 2024-09-30 13F CORNING COM 219350105 222,934 -7,060 -3.07 10,065 12.65 1.8870
2024-07-31 2024-06-30 13F CORNING COM 219350105 229,994 167 0.07 8,935 17.95 1.7376
2024-05-07 2024-03-31 13F CORNING COM 219350105 229,827 -2,011 -0.87 7,575 7.31 1.4876
2024-01-31 2023-12-31 13F CORNING INC COM COM 219350105 231,838 -1,300 -0.56 7,059 -0.62 1.4809
2023-10-30 2023-09-30 13F/A-1 CORNING INC COM COM 219350105 233,138 -5,145 -2.16 7,104 -14.92 1.5848
2023-10-30 2023-09-30 13F CORNING INC COM COM 219350105 233,138 -5,145 7,104 1.5848
2023-07-28 2023-06-30 13F CORNING INC COM COM 219350105 238,283 -5,488 -2.25 8,349 -2.92 1.8013
2023-04-19 2023-03-31 13F CORNING INC COM COM 219350105 243,771 -1,586 -0.65 8,600 9.75 1.8600
2023-01-26 2022-12-31 13F CORNING INC COM COM 219350105 245,357 -1,620 -0.66 7,837 9.33 1.7241
2022-10-21 2022-09-30 13F CORNING INC COM COM 219350105 246,977 -56,442 -18.60 7,167 -25.03 1.7300
2022-07-20 2022-06-30 13F CORNING INC COM COM 219350105 303,419 391 0.13 9,560 -14.52 1.7858
2022-04-25 2022-03-31 13F CORNING COM 219350105 303,028 -1,823 -0.60 11,184 -1.45 1.8077
2022-01-28 2021-12-31 13F CORNING COM 219350105 304,851 9,081 3.07 11,349 5.16 1.7425
2021-10-21 2021-09-30 13F CORNING COM 219350105 295,770 -2,120 -0.71 10,792 -11.42 1.8268
2021-07-29 2021-06-30 13F CORNING COM 219350105 297,890 -4,461 -1.48 12,183 -7.39 2.0009
2021-04-22 2021-03-31 13F CORNING COM 219350105 302,351 -1,050 -0.35 13,155 20.44 2.2475
2021-02-01 2020-12-31 13F CORNING COM 219350105 303,401 -315 -0.10 10,922 10.96 2.0140
2020-10-23 2020-09-30 13F CORNING COM 219350105 303,716 -12,391 -3.92 9,843 20.23 2.0335
2020-07-27 2020-06-30 13F CORNING COM 219350105 316,107 62,445 24.62 8,187 57.14 1.8030
2020-04-23 2020-03-31 13F CORNING COM 219350105 253,662 9,026 3.69 5,210 -26.84 1.3357
2020-01-24 2019-12-31 13F CORNING COM 219350105 244,636 598 0.25 7,121 2.33 1.4014
2019-10-25 2019-09-30 13F CORNING COM 219350105 244,038 13,396 5.81 6,959 -9.20 1.4685
2019-07-26 2019-06-30 13F CORNING INC COM COM 219350105 230,642 1,935 0.85 7,664 1.24 1.6206
2019-04-29 2019-03-31 13F CORNING INC COM COM 219350105 228,707 3,005 1.33 7,570 11.03 1.6122
2019-01-28 2018-12-31 13F CORNING INC COM COM 219350105 225,702 -3,407 -1.49 6,818 -15.69 1.6726
2018-10-26 2018-09-30 13F CORNING INC COM COM 219350105 229,109 -2,785 -1.20 8,087 26.78 1.7204
2018-08-06 2018-06-30 13F CORNING INC COM COM 219350105 231,894 2,377 1.04 6,379 -0.30 1.3679
2018-04-23 2018-03-31 13F CORNING INC COM COM 219350105 229,517 16,006 7.50 6,398 -6.33 1.2624
2018-01-26 2017-12-31 13F CORNING INC COM COM 219350105 213,511 -325 -0.15 6,830 6.75 1.3157
2017-10-20 2017-09-30 13F CORNING INC COM COM 219350105 213,836 -550 -0.26 6,398 -0.68 1.2798
2017-07-28 2017-06-30 13F CORNING INC COM COM 219350105 214,386 -6,895 -3.12 6,442 7.82 1.3074
2017-04-28 2017-03-31 13F CORNING INC COM COM 219350105 221,281 -31,661 -12.52 5,975 -2.67 1.1774
2017-01-31 2016-12-31 13F CORNING INC COM COM 219350105 252,942 -136,723 -35.09 6,139 -33.39 1.2455
2016-10-21 2016-09-30 13F CORNING INC COM COM 219350105 389,665 -37,164 -8.71 9,216 5.43 1.8580
2016-07-26 2016-06-30 13F CORNING INC COM COM 219350105 426,829 -9,357 -2.15 8,741 -4.07 1.7699
2016-04-13 2016-03-31 13F CORNING INC COM COM 219350105 436,186 -7,172 -1.62 9,112 12.42 2.2686
2016-01-19 2015-12-31 13F CORNING INC COM COM 219350105 443,358 -12,737 -2.79 8,105 3.80 1.9944
2015-10-22 2015-09-30 13F CORNING COM 219350105 456,095 -10,834 -2.32 7,808 -15.25 1.7156
2015-07-23 2015-06-30 13F CORNING COM 219350105 466,929 -34,206 -6.83 9,213 -18.94 1.8612
2015-04-22 2015-03-31 13F CORNING COM 219350105 501,135 501,135 0.00 11,366 2.0833
2015-02-02 2014-12-31 13F CORNING COM 219350105 0 -512,168 -100.00 0 -100.00
2014-11-07 2014-09-30 13F CORNING COM 219350105 512,168 -7,331 -1.41 9,905 -13.14 1.8604
2014-07-16 2014-06-30 13F CORNING COM 219350105 519,499 3,688 0.71 11,403 6.18 2.3106
2014-04-22 2014-03-31 13F CORNING COM 219350105 515,811 95,782 22.80 10,739 43.47 2.2445
2014-01-30 2013-12-31 13F CORNING COM 219350105 420,029 8,486 2.06 7,485 24.67 1.6031
2013-10-30 2013-09-30 13F CORNING COM 219350105 411,543 -7,625 -1.82 6,004 0.65 1.4150
2013-07-18 2013-06-30 13F CORNING COM 219350105 419,168 419,168 5,965 1.4324
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.