Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionD.B. Root & Company, LLC
Latest Disclosed Ownership15,870 shares
Latest Disclosed Value $ 2,157,792
D.B. Root & Company, LLC reports 2.92% decrease in ownership of GLW / Corning Incorporated

On May 12, 2026 - D.B. Root & Company, LLC filed a 13F-HR form disclosing ownership of 15,870 shares of Corning Incorporated (MX:GLW) valued at $2,157,792 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 16,348 shares of Corning Incorporated. This represents a change in shares of -2.92% 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 COM 219350105 15,870 -478 -2.92 2,158 50.73 0.5155
2026-02-03 2025-12-31 13F CORNING COM 219350105 16,348 -57 -0.35 1,431 6.39 0.3492
2025-11-06 2025-09-30 13F CORNING COM 219350105 16,405 -354 -2.11 1,346 52.67 0.3415
2025-07-22 2025-06-30 13F CORNING COM 219350105 16,759 -968 -5.46 881 8.63 0.2602
2025-05-14 2025-03-31 13F CORNING COM 219350105 17,727 663 3.89 812 0.12 0.2620
2025-01-17 2024-12-31 13F CORNING COM 219350105 17,064 -919 -5.11 811 -0.12 0.2579
2024-10-31 2024-09-30 13F CORNING COM 219350105 17,983 -4,224 -19.02 812 -5.92 0.2676
2024-07-15 2024-06-30 13F CORNING COM 219350105 22,207 -16,317 -42.36 863 -32.07 0.2944
2024-04-17 2024-03-31 13F CORNING COM 219350105 38,524 -1,780 -4.42 1,270 3.42 0.4291
2024-01-16 2023-12-31 13F CORNING COM 219350105 40,304 794 2.01 1,227 2.00 0.4449
2023-11-03 2023-09-30 13F CORNING COM 219350105 39,510 1,574 4.15 1,204 -9.48 0.4693
2023-07-18 2023-06-30 13F CORNING COM 219350105 37,936 1,665 4.59 1,329 3.91 0.5028
2023-04-18 2023-03-31 13F CORNING COM 219350105 36,271 1,883 5.48 1,280 16.48 0.5035
2023-01-27 2022-12-31 13F CORNING COM 219350105 34,388 2,432 7.61 1,098 18.45 0.4641
2022-10-26 2022-09-30 13F Corning COM 219350105 31,956 475 1.51 927 -6.46 0.4221
2022-07-21 2022-06-30 13F Corning COM 219350105 31,481 1,894 6.40 991 -9.25 0.4250
2022-05-06 2022-03-31 13F Corning COM 219350105 29,587 712 2.47 1,092 1.58 0.4065
2022-02-01 2021-12-31 13F Corning COM 219350105 28,875 -72 -0.25 1,075 1.80 0.3876
2021-10-22 2021-09-30 13F Corning COM 219350105 28,947 273 0.95 1,056 -9.90 0.4118
2021-07-28 2021-06-30 13F Corning COM 219350105 28,674 -498 -1.71 1,172 -7.64 0.4377
2021-05-04 2021-03-31 13F Corning COM 219350105 29,172 -59 -0.20 1,269 20.63 0.4988
2021-02-09 2020-12-31 13F Corning COM 219350105 29,231 -2,478 -7.81 1,052 2.43 0.4200
2020-10-22 2020-09-30 13F Corning COM 219350105 31,709 -905 -2.77 1,027 21.68 0.4122
2020-08-06 2020-06-30 13F Corning COM 219350105 32,614 425 1.32 844 27.69 0.3665
2020-04-29 2020-03-31 13F Corning COM 219350105 32,189 3,145 10.83 661 -21.78 0.3336
2020-01-14 2019-12-31 13F Corning COM 219350105 29,044 -250 -0.85 845 1.20 0.3722
2019-10-28 2019-09-30 13F Corning COM 219350105 29,294 -608 -2.03 835 -15.91 0.3890
2019-07-19 2019-06-30 13F Corning COM 219350105 29,902 -1,906 -5.99 993 -5.70 0.4400
2019-04-12 2019-03-31 13F Corning Stock 219350105 31,808 930 3.01 1,053 12.86 0.4495
2019-01-25 2018-12-31 13F/A-1 Corning Stock 219350105 30,878 -69 -0.22 933 -14.56 0.4641
2019-01-24 2018-12-31 13F Corning Stock 219350105 30,947 0 1,092 0.4811
2018-11-05 2018-09-30 13F Corning Stock 219350105 30,947 107 0.35 1,092 28.77 0.4811
2018-07-25 2018-06-30 13F Corning Stock 219350105 30,840 1,130 3.80 848 2.42 0.4001
2018-05-02 2018-03-31 13F Corning Stock 219350105 29,710 3,456 13.16 828 -1.43 0.4372
2018-02-22 2017-12-31 13F CORNING COM 219350105 26,254 26,254 840 0.7196
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.