Corning Incorporated
US ˙ NYSE ˙ US2193501051

SecurityGLW / Corning Incorporated
InstitutionClean Yield Group
Latest Disclosed Ownership2,763 shares
Latest Disclosed Value $ 375,685
Clean Yield Group ownership in GLW / Corning Incorporated

On April 14, 2026 - Clean Yield Group filed a 13F-HR form disclosing ownership of 2,763 shares of Corning Incorporated (US:GLW) valued at $375,685 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 2,763 shares of Corning Incorporated. This represents a change in shares of 0.00% during the quarter. The current value of the position is $554,700 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-14 2026-03-31 13F CORNING INC COM Stock 219350105 2,763 0 0.00 376 55.60 0.1058
2026-01-26 2025-12-31 13F CORNING INC COM Stock 219350105 2,763 0 0.00 242 6.64 0.0672
2025-10-23 2025-09-30 13F CORNING INC COM Stock 219350105 2,763 0 0.00 227 55.86 0.0641
2025-07-17 2025-06-30 13F CORNING INC COM Stock 219350105 2,763 0 0.00 145 15.08 0.0435
2025-04-14 2025-03-31 13F CORNING INC COM Stock 219350105 2,763 -537 -16.27 126 -19.23 0.0412
2025-01-13 2024-12-31 13F CORNING INC COM Stock 219350105 3,300 0 0.00 157 5.41 0.0499
2024-10-07 2024-09-30 13F CORNING INC COM Stock 219350105 3,300 0 0.00 149 15.63 0.0472
2024-07-10 2024-06-30 13F CORNING INC COM Stock 219350105 3,300 0 0.00 128 18.52 0.0479
2024-05-29 2024-03-31 13F CORNING INC COM Stock 219350105 3,300 0 0.00 109 8.00 0.0423
2024-01-24 2023-12-31 13F CORNING INC COM Stock 219350105 3,300 0 0.00 100 4.17 0.0423
2023-10-12 2023-09-30 13F CORNING INC COM Stock 219350105 3,300 3,000 1,000.00 96 860.00 0.0426
2023-07-26 2023-06-30 13F CORNING INC COM Stock 219350105 300 0 0.00 11 0.00 0.0043
2023-04-26 2023-03-31 13F CORNING INC COM Stock 219350105 300 0 0.00 11 11.11 0.0045
2023-01-31 2022-12-31 13F CORNING INC COM Stock 219350105 300 -250 -45.45 10 -43.75 0.0041
2022-10-31 2022-09-30 13F CORNING INC COM Stock 219350105 550 -25 -4.35 16 -11.11 0.0074
2022-07-18 2022-06-30 13F CORNING INC COM Stock 219350105 575 0 0.00 18 -14.29 0.0074
2022-04-25 2022-03-31 13F CORNING INC COM Stock 219350105 575 0 0.00 21 0.00 0.0074
2022-01-24 2021-12-31 13F CORNING INC COM Stock 219350105 575 300 109.09 21 110.00 0.0067
2021-10-27 2021-09-30 13F CORNING INC COM Stock 219350105 275 0 0.00 10 -9.09 0.0033
2021-07-26 2021-06-30 13F CORNING INC COM Stock 219350105 275 275 11 0.0037
2020-04-20 2020-03-31 13F CORNING INC COM Stock 219350105 0 -3,000 -100.00 0 -100.00
2020-01-17 2019-12-31 13F CORNING INC COM Stock 219350105 3,000 -1,500 -33.33 87 -32.03 0.0273
2019-10-23 2019-09-30 13F CORNING INC COM Stock 219350105 4,500 0 0.00 128 -14.67 0.0422
2019-07-22 2019-06-30 13F CORNING INC COM Stock 219350105 4,500 0 0.00 150 0.67 0.0542
2019-04-24 2019-03-31 13F CORNING INC COM Stock 219350105 4,500 -752 -14.32 149 -6.29 0.0603
2019-01-23 2018-12-31 13F CORNING INC COM Stock 219350105 5,252 5,252 16.71 159 6.71 0.0692
2017-07-17 2017-06-30 13F CORNING INC COM Stock 219350105 0 -4,500 -100.00 0 -100.00
2017-05-03 2017-03-31 13F CORNING INC COM Stock 219350105 4,500 4,500 122 0.0514
2015-07-31 2015-06-30 13F CORNING INC COM Stock 219350105 0 -150 -100.00 0 -100.00
2015-04-24 2015-03-31 13F CORNING INC COM Stock 219350105 150 150 3 0.0013
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.