Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionRobeco Institutional Asset Management B.V.
Latest Disclosed Ownership171,571 shares
Latest Disclosed Value $ 23,328,509
Robeco Institutional Asset Management B.V. reports 34.78% decrease in ownership of GLW / Corning Incorporated

On April 21, 2026 - Robeco Institutional Asset Management B.V. filed a 13F-HR form disclosing ownership of 171,571 shares of Corning Incorporated (MX:GLW) valued at $23,328,509 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 263,074 shares of Corning Incorporated. This represents a change in shares of -34.78% 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)
2026-04-21 2026-03-31 13F CORNING COM 219350105 171,571 -91,503 -34.78 23,329 1.28 0.0333
2026-01-23 2025-12-31 13F CORNING COM 219350105 263,074 -1,108,309 -80.82 23,035 -79.52 0.0328
2025-10-22 2025-09-30 13F CORNING COM 219350105 1,371,383 -430,028 -23.87 112,495 18.74 0.1630
2025-07-18 2025-06-30 13F CORNING COM 219350105 1,801,411 1,170,992 185.75 94,736 228.26 0.1532
2025-04-23 2025-03-31 13F CORNING COM 219350105 630,419 256,205 68.46 28,861 62.30 0.0561
2025-01-23 2024-12-31 13F CORNING COM 219350105 374,214 -39,113 -9.46 17,783 -4.71 0.0337
2024-10-29 2024-09-30 13F CORNING COM 219350105 413,327 325,776 372.10 18,662 448.69 0.0371
2024-07-23 2024-06-30 13F CORNING COM 219350105 87,551 -173 -0.20 3,401 17.64 0.0073
2024-04-24 2024-03-31 13F CORNING COM 219350105 87,724 -9,675 -9.93 2,891 -2.50 0.0063
2024-02-14 2023-12-31 13F/A-1 CORNING COM 219350105 97,399 -12,578 -11.44 2,966 -11.52 0.0072
2024-02-08 2023-12-31 13F CORNING COM 219350105 82,741 -27,236 97 0.0182
2023-10-24 2023-09-30 13F CORNING COM 219350105 109,977 2,308 2.14 3,351 -11.16 0.0090
2023-07-24 2023-06-30 13F CORNING COM 219350105 107,669 -37,538 -25.85 3,773 -26.36 0.0099
2023-05-04 2023-03-31 13F CORNING COM 219350105 145,207 37,308 34.58 5,123 48.64 0.0140
2023-02-07 2022-12-31 13F CORNING COM 219350105 107,899 -170,737 -61.28 3,446 -57.38 0.0099
2022-12-01 2022-09-30 13F/A-1 CORNING COM 219350105 278,636 -161,211 -36.65 8,085 -41.67 0.0261
2022-10-27 2022-09-30 13F CORNING COM 219350105 278,636 -161,211 8,085 0.0258
2022-12-01 2022-06-30 13F/A-1 CORNING COM 219350105 439,847 90,657 25.96 13,860 7.54 0.0431
2022-07-27 2022-06-30 13F CORNING COM 219350105 439,847 90,657 13,860 0.0425
2022-12-01 2022-03-31 13F/A-1 CORNING COM 219350105 349,190 186,760 114.98 12,888 113.24 0.0304
2022-04-26 2022-03-31 13F CORNING COM 219350105 349,190 186,760 12,888 0.0300
2022-12-01 2021-12-31 13F/A-1 CORNING COM 219350105 162,430 -62,734 -27.86 6,044 -26.45 0.0129
2022-01-31 2021-12-31 13F CORNING COM 219350105 162,430 -62,734 6,044 0.0127
2022-12-01 2021-09-30 13F/A-1 CORNING COM 219350105 225,164 -430,743 -65.67 8,217 -69.37 0.0182
2021-10-20 2021-09-30 13F CORNING COM 219350105 225,164 -430,743 8,217 0.0180
2022-12-01 2021-06-30 13F/A-1 CORNING COM 219350105 655,907 -514,255 -43.95 26,825 -47.31 0.0595
2021-07-28 2021-06-30 13F CORNING COM 219350105 655,907 -514,255 26,825 0.0587
2022-12-01 2021-03-31 13F/A-1 CORNING COM 219350105 1,170,162 -104,983 -8.23 50,913 10.90 0.1255
2021-04-23 2021-03-31 13F CORNING COM 219350105 1,170,162 -104,983 50,913 0.1237
2022-12-01 2020-12-31 13F/A-1 CORNING COM 219350105 1,275,145 437,003 52.14 45,909 69.01 0.1206
2021-01-28 2020-12-31 13F CORNING COM 219350105 1,275,145 437,003 45,909 0.1192
2021-01-19 2020-09-30 13F/A-1 CORNING COM 219350105 838,142 784,096 1,450.79 27,164 1,841.67 0.0840
2020-10-29 2020-09-30 13F CORNING COM 219350105 838,142 784,096 27,164 83,891.2728
2021-01-19 2020-06-30 13F/A-1 CORNING COM 219350105 54,046 5,000 10.19 1,399 38.93 0.0048
2020-07-20 2020-06-30 13F CORNING COM 219350105 54,046 5,000 1,399 4,747.0565
2021-01-19 2020-03-31 13F/A-1 CORNING COM 219350105 49,046 -28,626 -36.85 1,007 -55.46 0.0040
2020-04-30 2020-03-31 13F CORNING COM 219350105 49,046 -28,626 1,007 4,036.2831
2021-01-19 2019-12-31 13F/A-1 CORNING COM 219350105 77,672 -157,012 -66.90 2,261 -66.22 0.0072
2020-02-06 2019-12-31 13F CORNING COM 219350105 77,672 -157,012 2,261 7,231.6346
2021-01-19 2019-09-30 13F/A-1 CORNING COM 219350105 234,684 -579,005 -71.16 6,694 -75.24 0.0236
2019-10-17 2019-09-30 13F CORNING COM 219350105 234,684 -579,005 6,694 23,599.1029
2021-01-19 2019-06-30 13F/A-1 CORNING COM 219350105 813,689 -117,838 -12.65 27,038 -12.31 0.0955
2019-07-19 2019-06-30 13F CORNING COM 219350105 813,689 -117,838 27,038 95,343.0603
2021-01-19 2019-03-31 13F/A-1 CORNING COM 219350105 931,527 138,055 17.40 30,833 28.99 0.1134
2019-05-02 2019-03-31 13F CORNING COM 219350105 931,527 138,055 30,833 113,207.8076
2021-01-19 2018-12-31 13F/A-1 CORNING COM 219350105 793,472 122,314 18.22 23,904 0.90 0.1073
2019-02-08 2018-12-31 13F CORNING COM 219350105 793,472 122,314 23,904 107,148.4954
2021-01-19 2018-09-30 13F/A-1 CORNING COM 219350105 671,158 2,905 0.43 23,691 28.86 0.0938
2018-10-25 2018-09-30 13F CORNING COM 219350105 671,158 2,905 23,691
2021-01-19 2018-06-30 13F/A-1 CORNING COM 219350105 668,253 -81,562 -10.88 18,385 -12.05 0.0837
2018-08-03 2018-06-30 13F CORNING COM 219350105 668,253 -81,562 18,385
2021-01-19 2018-03-31 13F/A-1 CORNING COM 219350105 749,815 -424,448 -36.15 20,905 -44.35 0.0981
2018-05-07 2018-03-31 13F CORNING COM 219350105 749,815 -424,448 20,905 97,762.9060
2021-01-19 2017-12-31 13F/A-1 CORNING COM 219350105 1,174,263 241,721 25.92 37,567 34.65 0.1947
2018-01-25 2017-12-31 13F CORNING COM 219350105 1,174,263 241,721 37,567
2021-01-19 2017-09-30 13F/A-1 CORNING COM 219350105 932,542 -4,536 -0.48 27,899 -0.92 0.1732
2017-10-17 2017-09-30 13F CORNING COM 219350105 932,542 -4,536 27,899 172,844.0923
2021-01-19 2017-06-30 13F/A-1 CORNING COM 219350105 937,078 162,132 20.92 28,159 34.58 0.1814
2017-08-07 2017-06-30 13F CORNING COM 219350105 937,078 162,132 28,159 183,337.7683
2021-01-19 2017-03-31 13F/A-1 CORNING COM 219350105 774,946 265,949 52.25 20,924 69.38 0.1393
2017-05-15 2017-03-31 13F CORNING COM 219350105 774,946 265,949 20,924 138,975.9444
2017-02-09 2016-12-31 13F CORNING COM 219350105 508,997 2,245 0.44 12,353 3.10 0.0966
2016-11-07 2016-09-30 13F CORNING COM 219350105 506,752 -2,959 -0.58 11,982 14.79 0.0886
2016-07-22 2016-06-30 13F CORNING COM 219350105 509,711 0 0.00 10,438 -1.97 0.0791
2016-05-16 2016-03-31 13F CORNING COM 219350105 509,711 11,631 2.34 10,648 16.95 0.0854
2016-02-08 2015-12-31 13F CORNING COM 219350105 498,080 90,837 22.31 9,105 30.58 0.0779
2015-11-12 2015-09-30 13F CORNING COM 219350105 407,243 45,321 12.52 6,973 -2.38 0.0531
2015-08-17 2015-06-30 13F CORNING COM 219350105 361,922 -83,189 -18.69 7,143 -29.26 0.0542
2015-04-24 2015-03-31 13F CORNING COM 219350105 445,111 -19,968 -4.29 10,097 -5.31 0.0759
2015-02-12 2014-12-31 13F CORNING COM 219350105 465,079 37,541 8.78 10,663 28.95 0.0765
2014-11-10 2014-09-30 13F CORNING COM 219350105 427,538 15,723 3.82 8,269 -8.53 0.0591
2014-08-13 2014-06-30 13F CORNING COM 219350105 411,815 118,062 40.19 9,040 47.83 0.0647
2014-05-07 2014-03-31 13F CORNING COM 219350105 293,753 129,788 79.16 6,115 109.27 0.0469
2014-02-04 2013-12-31 13F CORNING COM 219350105 163,965 26,717 19.47 2,922 45.95 0.0243
2013-11-12 2013-09-30 13F CORNING COM 219350105 137,248 -23,734 -14.74 2,002 -12.58 0.0194
2013-08-27 2013-06-30 13F Corning COM 219350105 160,982 160,982 2,290 0.0232
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.