Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionWest Branch Capital LLC
Latest Disclosed Ownership672 shares
Latest Disclosed Value $ 91,439
West Branch Capital LLC reports 37.20% decrease in ownership of GLW / Corning Incorporated

On April 14, 2026 - West Branch Capital LLC filed a 13F-HR form disclosing ownership of 672 shares of Corning Incorporated (MX:GLW) valued at $91,439 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 1,070 shares of Corning Incorporated. This represents a change in shares of -37.20% 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)
2026-04-14 2026-03-31 13F CORNING COM 219350105 672 -398 -37.20 91 -2.15 0.0245
2026-01-16 2025-12-31 13F CORNING COM 219350105 1,070 -997 -48.23 94 -44.97 0.0241
2025-10-21 2025-09-30 13F CORNING COM 219350105 2,067 -463 -18.30 170 27.07 0.0445
2025-07-16 2025-06-30 13F CORNING COM 219350105 2,530 -6,047 -70.50 133 -66.07 0.0393
2025-04-16 2025-03-31 13F CORNING COM 219350105 8,577 -804 -8.57 393 -11.91 0.1310
2025-01-17 2024-12-31 13F CORNING COM 219350105 9,381 -1,624 -14.76 446 -10.28 0.1422
2024-10-18 2024-09-30 13F CORNING COM 219350105 11,005 -2,911 -20.92 497 -8.15 0.1718
2024-07-26 2024-06-30 13F CORNING COM 219350105 13,916 -446 -3.11 541 14.16 0.2008
2024-04-24 2024-03-31 13F CORNING COM 219350105 14,362 -296 -2.02 473 6.05 0.1909
2024-01-19 2023-12-31 13F CORNING COM 219350105 14,658 -708 -4.61 446 -4.70 0.2098
2023-10-20 2023-09-30 13F CORNING COM 219350105 15,366 104 0.68 468 -12.36 0.2457
2023-08-07 2023-06-30 13F CORNING COM 219350105 15,262 -434 -2.77 535 -3.44 0.2668
2023-04-20 2023-03-31 13F CORNING COM 219350105 15,696 44 0.28 554 10.82 0.3085
2023-01-27 2022-12-31 13F CORNING COM 219350105 15,652 94 0.60 500 10.40 0.3088
2022-10-19 2022-09-30 13F CORNING COM 219350105 15,558 106 0.69 452 -7.19 0.2809
2022-07-28 2022-06-30 13F CORNING COM 219350105 15,452 94 0.61 487 -14.11 0.2817
2022-05-03 2022-03-31 13F CORNING COM 219350105 15,358 -127 -0.82 567 -1.73 0.2709
2022-01-24 2021-12-31 13F CORNING COM 219350105 15,485 179 1.17 577 3.22 0.2456
2021-11-09 2021-09-30 13F CORNING COM 219350105 15,306 -1,306 -7.86 559 -17.67 0.2690
2021-08-17 2021-06-30 13F CORNING COM 219350105 16,612 76 0.46 679 -5.56 0.3337
2021-05-14 2021-03-31 13F CORNING COM 219350105 16,536 -368 -2.18 719 18.06 0.4207
2021-02-08 2020-12-31 13F CORNING COM 219350105 16,904 -573 -3.28 609 7.60 0.3599
2020-10-13 2020-09-30 13F CORNING COM 219350105 17,477 -44 -0.25 566 24.67 0.3612
2020-07-08 2020-06-30 13F CORNING COM 219350105 17,521 -4,199 -19.33 454 1.79 0.3199
2020-04-20 2020-03-31 13F CORNING COM 219350105 21,720 -2,006 -8.45 446 -35.46 0.4260
2020-01-07 2019-12-31 13F CORNING COM 219350105 23,726 -6,384 -21.20 691 -19.56 0.4813
2019-10-23 2019-09-30 13F Corning COM 219350105 30,110 -9,555 -24.09 859 -34.83 0.6362
2019-08-05 2019-06-30 13F Corning COM 219350105 39,665 192 0.49 1,318 0.84 1.0875
2019-04-30 2019-03-31 13F CORNING COM 219350105 39,473 199 0.51 1,307 10.20 1.1699
2019-02-06 2018-12-31 13F CORNING COM 219350105 39,274 -91 -0.23 1,186 -14.68 1.2492
2018-10-15 2018-09-30 13F CORNING COM 219350105 39,365 -10,692 -21.36 1,390 0.94 1.0312
2018-08-02 2018-06-30 13F CORNING COM 219350105 50,057 50,057 1,377 1.0853
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.