Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionRobeco Schweiz AG
Latest Disclosed Ownership262,500 shares
Latest Disclosed Value $ 35,692,125
Robeco Schweiz AG reports 53.96% increase in ownership of GLW / Corning Incorporated

On May 7, 2026 - Robeco Schweiz AG filed a 13F-HR form disclosing ownership of 262,500 shares of Corning Incorporated (MX:GLW) valued at $35,692,125 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 170,500 shares of Corning Incorporated. This represents a change in shares of 53.96% 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)
2026-05-07 2026-03-31 13F CORNING COM 219350105 262,500 92,000 53.96 35,692 139.09 0.7548
2026-02-03 2025-12-31 13F CORNING COM 219350105 170,500 -39,000 -18.62 14,929 -13.13 0.3345
2025-10-27 2025-09-30 13F CORNING COM 219350105 209,500 -39,000 -15.69 17,185 31.50 0.3863
2025-08-07 2025-06-30 13F CORNING COM 219350105 248,500 23,000 10.20 13,069 26.59 0.3016
2025-04-30 2025-03-31 13F CORNING COM 219350105 225,500 225,500 10,323 0.2540
2024-08-08 2024-06-30 13F CORNING COM 219350105 0 -333,300 -100.00 0 -100.00
2024-04-25 2024-03-31 13F CORNING COM 219350105 333,300 -187,700 -36.03 10,986 -30.76 0.1917
2024-02-14 2023-12-31 13F CORNING COM 219350105 521,000 -307,000 -37.08 15,864 -37.12 0.2665
2023-11-08 2023-09-30 13F CORNING COM 219350105 828,000 0 0.00 25,229 -13.04 0.4265
2023-08-14 2023-06-30 13F CORNING COM 219350105 828,000 0 0.00 29,013 -0.68 0.4322
2023-05-08 2023-03-31 13F CORNING COM 219350105 828,000 0 0.00 29,212 10.46 0.4720
2023-02-07 2022-12-31 13F CORNING COM 219350105 828,000 -80,000 -8.81 26,446 0.4831
2022-11-10 2022-09-30 13F CORNING COM 219350105 908,000 -192,000 -17.45 0 -100.00
2022-08-03 2022-06-30 13F CORNING COM 219350105 1,100,000 0 0.00 34,661 -14.63 0.6181
2022-05-13 2022-03-31 13F CORNING COM 219350105 1,100,000 -550,000 -33.33 40,601 -33.91 0.5721
2022-02-08 2021-12-31 13F CORNING COM 219350105 1,650,000 0 0.00 61,430 2.03 0.7963
2021-10-13 2021-09-30 13F CORNING COM 219350105 1,650,000 0 0.00 60,209 -10.78 0.7022
2021-07-15 2021-06-30 13F CORNING COM 219350105 1,650,000 50,000 3.12 67,485 -3.06 0.9401
2021-05-04 2021-03-31 13F CORNING COM 219350105 1,600,000 630,000 64.95 69,616 99.36 1.0636
2021-02-16 2020-12-31 13F CORNING COM 219350105 970,000 170,000 21.25 34,920 34.68 0.7483
2020-10-13 2020-09-30 13F CORNING COM 219350105 800,000 -130,000 -13.98 25,928 7.64 0.7681
2020-07-07 2020-06-30 13F CORNING COM 219350105 930,000 0 0.00 24,087 21.71 0.8649
2020-04-10 2020-03-31 13F CORNING COM 219350105 930,000 80,000 9.41 19,790 -19.75 0.8476
2020-02-19 2019-12-31 13F/A-1 CORNING COM 219350105 850,000 50,000 6.25 24,659 8.61 0.9194
2020-02-13 2019-12-31 13F CORNING COM 219350105 850,000 50,000 29 166,561.3692
2019-10-18 2019-09-30 13F CORNING COM 219350105 800,000 0 0.00 22,704 -14.60 0.9750
2019-07-31 2019-06-30 13F CORNING COM 219350105 800,000 0 0.00 26,584 0.39 1.1272
2019-05-14 2019-03-31 13F CORNING COM 219350105 800,000 0 0.00 26,480 11.26 1.0953
2019-02-01 2018-12-31 13F CORNING COM 219350105 800,000 0 0.00 23,800 -15.94 1.1007
2018-10-30 2018-09-30 13F CORNING COM 219350105 800,000 -15,000 -1.84 28,312 28.71 1.1047
2018-08-09 2018-06-30 13F CORNING COM 219350105 815,000 145,000 21.64 21,997 17.76 0.9378
2018-05-16 2018-03-31 13F CORNING COM 219350105 670,000 80,000 13.56 18,680 -1.98 0.8654
2018-02-14 2017-12-31 13F CORNING COM 219350105 590,000 90,000 18.00 19,057 27.26 1.2581
2017-11-09 2017-09-30 13F CORNING COM 219350105 500,000 30,000 6.38 14,975 4.91 1.1546
2017-08-15 2017-06-30 13F CORNING COM 219350105 470,000 -5,000 -1.05 14,274 9.04 1.1971
2017-05-10 2017-03-31 13F CORNING COM 219350105 475,000 25,000 5.56 13,091 19.03 1.1162
2017-01-10 2016-12-31 13F/A-1 CORNING COM 219350105 450,000 0 0.00 10,998 3.91 1.0118
2017-01-09 2016-12-31 13F CORNING COM 219350105 450,000 10,998
2016-11-15 2016-09-30 13F CORNING COM 219350105 450,000 -40,000 -8.16 10,584 9.03 0.9181
2016-08-12 2016-06-30 13F CORNING COM 219350105 490,000 120,000 32.43 9,707 25.89 0.8897
2016-05-18 2016-03-31 13F CORNING COM 219350105 370,000 0 0.00 7,711 12.72 0.7402
2016-02-16 2015-12-31 13F CORNING COM 219350105 370,000 0 0.00 6,841 10.71 0.5860
2015-10-27 2015-09-30 13F CORNING COM 219350105 370,000 44,000 13.50 6,179 -3.78 0.5765
2015-08-24 2015-06-30 13F CORNING COM 219350105 326,000 -25,640 -7.29 6,422 -21.41 0.5327
2015-04-20 2015-03-31 13F CORNING COM 219350105 351,640 351,640 0.00 8,172 0.6416
2015-01-26 2014-12-31 13F CORNING COM 219350105 0 -250,000 -100.00 0 -100.00
2014-10-22 2014-09-30 13F CORNING COM 219350105 250,000 45,000 21.95 4,888 8.38 0.3905
2014-08-08 2014-06-30 13F CORNING COM 219350105 205,000 35,000 20.59 4,510 28.71 0.3675
2014-05-05 2014-03-31 13F CORNING COM 219350105 170,000 0 0.00 3,504 15.91 0.3039
2014-01-22 2013-12-31 13F CORNING COM 219350105 170,000 -36,819 -17.80 3,023 -0.76 0.2673
2013-11-12 2013-09-30 13F CORNING COM 219350105 206,819 16,470 8.65 3,046 11.90 0.2552
2013-08-01 2013-06-30 13F CORNING COM 219350105 190,349 190,349 2,722 0.2445
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.