Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionCitizens & Northern Corp
Latest Disclosed Ownership19,658 shares
Latest Disclosed Value $ 2,672,898
Citizens & Northern Corp reports 9.55% decrease in ownership of GLW / Corning Incorporated

On April 27, 2026 - Citizens & Northern Corp filed a 13F-HR form disclosing ownership of 19,658 shares of Corning Incorporated (MX:GLW) valued at $2,672,898 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 21,734 shares of Corning Incorporated. This represents a change in shares of -9.55% 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)
2026-04-27 2026-03-31 13F Corning COM 219350105 19,658 -2,076 -9.55 2,673 40.41 0.6666
2026-01-28 2025-12-31 13F Corning COM 219350105 21,734 2,076 10.56 1,903 18.05 0.4716
2025-10-24 2025-09-30 13F Corning COM 219350105 19,658 0 0.00 1,613 56.05 0.3996
2025-07-30 2025-06-30 13F Corning COM 219350105 19,658 -100 -0.51 1,034 14.27 0.2767
2025-04-21 2025-03-31 13F Corning COM 219350105 19,758 -168 -0.84 905 -4.44 0.2550
2025-01-31 2024-12-31 13F Corning COM 219350105 19,926 0 0.00 947 5.23 0.2594
2024-11-04 2024-09-30 13F Corning COM 219350105 19,926 -200 -0.99 900 15.11 0.2701
2024-07-30 2024-06-30 13F Corning COM 219350105 20,126 200 1.00 782 19.05 0.2445
2024-05-13 2024-03-31 13F Corning COM 219350105 19,926 -2,440 -10.91 657 -3.67 0.2221
2024-02-09 2023-12-31 13F Corning COM 219350105 22,366 0 0.00 681 0.00 0.2431
2023-11-13 2023-09-30 13F Corning COM 219350105 22,366 -1 -0.00 681 -13.03 0.2737
2023-08-11 2023-06-30 13F Corning COM 219350105 22,367 0 0.00 784 -0.76 0.2962
2023-05-05 2023-03-31 13F Corning COM 219350105 22,367 0 0.00 789 10.50 0.3079
2023-02-14 2022-12-31 13F Corning COM 219350105 22,367 274 1.24 714 11.39 0.2951
2022-11-09 2022-09-30 13F Corning COM 219350105 22,093 0 0.00 641 -7.90 0.3004
2022-08-04 2022-06-30 13F Corning COM 219350105 22,093 -10 -0.05 696 -14.71 0.3033
2022-05-12 2022-03-31 13F Corning COM 219350105 22,103 -370 -1.65 816 -2.51 0.3015
2022-01-24 2021-12-31 13F Corning COM 219350105 22,473 -1,000 -4.26 837 -2.33 0.3001
2021-11-04 2021-09-30 13F Corning COM 219350105 23,473 0 0.00 857 -10.73 0.3289
2021-08-02 2021-06-30 13F Corning COM 219350105 23,473 -4,152 -15.03 960 -20.13 0.3600
2021-05-11 2021-03-31 13F Corning COM 219350105 27,625 -199 -0.72 1,202 19.96 0.4757
2021-02-09 2020-12-31 13F Corning COM 219350105 27,824 -3,000 -9.73 1,002 0.30 0.4411
2020-11-13 2020-09-30 13F Corning COM 219350105 30,824 1,168 3.94 999 30.08 0.5319
2020-08-07 2020-06-30 13F Corning COM 219350105 29,656 0 0.00 768 26.11 0.3751
2020-05-08 2020-03-31 13F Corning COM 219350105 29,656 0 0.00 609 -29.43 0.3831
2020-02-11 2019-12-31 13F Corning COM 219350105 29,656 0 0.00 863 2.01 0.4319
2019-11-12 2019-09-30 13F Corning COM 219350105 29,656 -2,000 -6.32 846 -19.58 0.4616
2019-08-14 2019-06-30 13F Corning COM 219350105 31,656 2,000 6.74 1,052 7.13 0.5848
2019-05-13 2019-03-31 13F Corning COM 219350105 29,656 -2,940 -9.02 982 -0.30 0.5477
2019-02-14 2018-12-31 13F Corning COM 219350105 32,596 61 0.19 985 -14.20 0.6870
2018-11-14 2018-09-30 13F Corning COM 219350105 32,535 158 0.49 1,148 28.84 0.7805
2018-08-03 2018-06-30 13F Corning COM 219350105 32,377 2,440 8.15 891 6.71 0.6332
2018-05-14 2018-03-31 13F Corning COM 219350105 29,937 -818 -2.66 835 -15.14 0.6209
2018-02-13 2017-12-31 13F Corning COM 219350105 30,755 -228 -0.74 984 6.15 0.6998
2017-11-13 2017-09-30 13F Corning COM 219350105 30,983 0 0.00 927 -0.43 0.7058
2017-08-11 2017-06-30 13F Corning COM 219350105 30,983 -2,864 -8.46 931 1.86 0.7323
2017-05-11 2017-03-31 13F Corning COM 219350105 33,847 -2,600 -7.13 914 3.28 0.7369
2017-02-13 2016-12-31 13F Corning COM 219350105 36,447 -406 -1.10 885 1.49 0.6688
2016-11-10 2016-09-30 13F Corning COM 219350105 36,853 -1,196 -3.14 872 11.94 0.6835
2016-08-10 2016-06-30 13F Corning COM 219350105 38,049 9,000 30.98 779 28.34 0.6079
2016-05-13 2016-03-31 13F Corning COM 219350105 29,049 -134 -0.46 607 13.88 0.4791
2016-02-16 2015-12-31 13F Corning COM 219350105 29,183 700 2.46 533 9.22 0.4346
2015-11-13 2015-09-30 13F Corning COM 219350105 28,483 -2,579 -8.30 488 -20.39 0.3815
2015-08-13 2015-06-30 13F Corning COM 219350105 31,062 0 0.00 613 -12.93 0.4747
2015-05-15 2015-03-31 13F Corning COM 219350105 31,062 1,073 3.58 704 2.33 0.5332
2015-02-12 2014-12-31 13F Corning COM 219350105 29,989 943 3.25 688 22.42 0.5197
2014-11-12 2014-09-30 13F Corning COM 219350105 29,046 300 1.04 562 -10.94 0.4550
2014-08-13 2014-06-30 13F Corning COM 219350105 28,746 -235 -0.81 631 4.64 0.5078
2014-05-15 2014-03-31 13F Corning COM 219350105 28,981 -221 -0.76 603 15.96 0.4709
2014-02-13 2013-12-31 13F Corning COM 219350105 29,202 -800 -2.67 520 18.72 0.3948
2013-11-14 2013-09-30 13F Corning COM 219350105 30,002 1,500 5.26 438 7.88 0.3549
2013-08-14 2013-06-30 13F Corning COM 219350105 28,502 28,502 406 0.3380
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.