Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionParthenon Llc
Latest Disclosed Ownership230,615 shares
Latest Disclosed Value $ 31,356,722
Parthenon Llc reports 0.02% decrease in ownership of GLW / Corning Incorporated

On April 28, 2026 - Parthenon Llc filed a 13F-HR form disclosing ownership of 230,615 shares of Corning Incorporated (MX:GLW) valued at $31,356,722 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 230,650 shares of Corning Incorporated. This represents a change in shares of -0.02% 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)
2026-04-28 2026-03-31 13F CORNING COM 219350105 230,615 -35 -0.02 31,357 55.27 3.5848
2026-01-23 2025-12-31 13F CORNING COM 219350105 230,650 -1,993 -0.86 20,196 5.83 2.1793
2025-10-31 2025-09-30 13F CORNING COM 219350105 232,643 -10,932 -4.49 19,084 48.98 2.1145
2025-07-29 2025-06-30 13F CORNING COM 219350105 243,575 -1,500 -0.61 12,810 14.17 1.4654
2025-05-02 2025-03-31 13F CORNING COM 219350105 245,075 -1,504 -0.61 11,220 -4.25 1.3798
2025-02-03 2024-12-31 13F CORNING COM 219350105 246,579 -6,825 -2.69 11,717 2.41 1.4173
2024-11-05 2024-09-30 13F CORNING COM 219350105 253,404 -4,973 -1.92 11,441 13.99 1.3663
2024-08-08 2024-06-30 13F CORNING COM 219350105 258,377 -7,030 -2.65 10,038 14.75 1.2751
2024-04-30 2024-03-31 13F CORNING COM 219350105 265,407 -9,220 -3.36 8,748 4.60 1.1090
2024-02-05 2023-12-31 13F CORNING COM 219350105 274,627 -4,085 -1.47 8,362 -1.53 1.1561
2023-10-30 2023-09-30 13F CORNING COM 219350105 278,712 -4,654 -1.64 8,492 -14.47 1.2742
2023-07-27 2023-06-30 13F CORNING COM 219350105 283,366 -1,800 -0.63 9,929 -1.30 1.4343
2023-05-08 2023-03-31 13F CORNING COM 219350105 285,166 -2,150 -0.75 10,061 9.63 1.5397
2023-02-08 2022-12-31 13F CORNING COM 219350105 287,316 -1,382 -0.48 9,177 9.52 1.5053
2022-11-01 2022-09-30 13F CORNING COM 219350105 288,698 -700 -0.24 8,378 -8.13 1.5120
2022-07-29 2022-06-30 13F CORNING COM 219350105 289,398 -3,650 -1.25 9,119 -15.69 1.5464
2022-05-09 2022-03-31 13F CORNING COM 219350105 293,048 -575 -0.20 10,816 -1.06 1.5678
2022-02-07 2021-12-31 13F CORNING COM 219350105 293,623 -8,345 -2.76 10,932 -0.79 1.5334
2021-10-28 2021-09-30 13F CORNING COM 219350105 301,968 -975 -0.32 11,019 -11.07 1.6558
2021-07-28 2021-06-30 13F CORNING COM 219350105 302,943 105 0.03 12,390 -5.97 1.8563
2021-04-23 2021-03-31 13F CORNING COM 219350105 302,838 2,330 0.78 13,176 21.80 2.1189
2021-02-03 2020-12-31 13F CORNING COM 219350105 300,508 -3,737 -1.23 10,818 9.70 1.8656
2020-10-29 2020-09-30 13F CORNING COM 219350105 304,245 -830 -0.27 9,861 24.81 1.9129
2020-07-24 2020-06-30 13F CORNING COM 219350105 305,075 350 0.11 7,901 26.23 1.6404
2020-04-28 2020-03-31 13F CORNING COM 219350105 304,725 -10,909 -3.46 6,259 -31.88 1.4895
2020-01-28 2019-12-31 13F CORNING COM 219350105 315,634 1,350 0.43 9,188 2.51 1.8341
2019-10-31 2019-09-30 13F CORNING COM 219350105 314,284 175 0.06 8,963 -14.13 1.9170
2019-07-29 2019-06-30 13F CORNING COM 219350105 314,109 12,255 4.06 10,438 4.47 2.2385
2019-05-03 2019-03-31 13F CORNING COM 219350105 301,854 -4,320 -1.41 9,991 8.01 2.2335
2019-01-29 2018-12-31 13F CORNING COM 219350105 306,174 1,079 0.35 9,250 -14.11 2.2776
2018-11-14 2018-09-30 13F CORNING COM 219350105 305,095 0 0.00 10,770 28.32 2.3667
2018-08-02 2018-06-30 13F CORNING COM 219350105 305,095 2,940 0.97 8,393 -0.37 1.9356
2018-05-03 2018-03-31 13F CORNING COM 219350105 302,155 4,100 1.38 8,424 -11.65 1.9843
2018-02-05 2017-12-31 13F CORNING COM 219350105 298,055 8,220 2.84 9,535 9.95 2.1488
2017-10-31 2017-09-30 13F CORNING COM 219350105 289,835 -230 -0.08 8,672 -0.50 2.0470
2017-07-21 2017-06-30 13F CORNING COM 219350105 290,065 4,295 1.50 8,716 12.96 2.0732
2017-05-05 2017-03-31 13F CORNING COM 219350105 285,770 1,500 0.53 7,716 11.84 1.8310
2017-02-01 2016-12-31 13F CORNING COM 219350105 284,270 -7,050 -2.42 6,899 0.13 1.6950
2016-11-07 2016-09-30 13F CORNING COM 219350105 291,320 -1,300 -0.44 6,890 14.97 1.7102
2016-07-26 2016-06-30 13F CORNING COM 219350105 292,620 -11,325 -3.73 5,993 -5.61 1.5038
2016-05-16 2016-03-31 13F CORNING COM 219350105 303,945 -5,640 -1.82 6,349 12.19 1.6305
2016-02-03 2015-12-31 13F CORNING COM 219350105 309,585 -5,200 -1.65 5,659 5.01 1.4794
2015-10-29 2015-09-30 13F CORNING COM 219350105 314,785 110 0.03 5,389 -13.21 1.5037
2015-07-24 2015-06-30 13F CORNING COM 219350105 314,675 -516 -0.16 6,209 -13.15 1.6388
2015-04-28 2015-03-31 13F CORNING COM 219350105 315,191 6,516 2.11 7,149 1.00 1.8978
2015-02-17 2014-12-31 13F CORNING COM 219350105 308,675 6,885 2.28 7,078 21.26 1.9517
2014-10-23 2014-09-30 13F CORNING COM 219350105 301,790 1,600 0.53 5,837 -11.41 1.6860
2014-07-28 2014-06-30 13F CORNING COM 219350105 300,190 2,700 0.91 6,589 6.38 1.9474
2014-04-18 2014-03-31 13F CORNING COM 219350105 297,490 -1,400 -0.47 6,194 16.30 1.8636
2014-02-21 2013-12-31 13F CORNING COM 219350105 298,890 50 0.02 5,326 22.16 1.6252
2013-10-17 2013-09-30 13F CORNING COM 219350105 298,840 4,400 1.49 4,360 4.06 1.4443
2013-07-22 2013-06-30 13F CORNING COM 219350105 294,440 294,440 4,190 1.4063
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.