Corning Incorporated
CH ˙ SWX ˙ US2193501051
155,65 CHF ↑17,60 (12,75%)
2026-06-02
DEL PRIS
SecurityCH:GLW / Corning Incorporated
InstitutionAssetmark, Inc
Latest Disclosed Ownership74,465 shares
Latest Disclosed Value $ 10,125,026
Assetmark, Inc reports 782.39% increase in ownership of GLW / Corning Incorporated

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 74,465 shares of Corning Incorporated (CH:GLW) valued at $7,737,658 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 8,439 shares of Corning Incorporated. This represents a change in shares of 782.39% during the quarter. The current value of the position is $11,590,477 USD.

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)
2026-05-06 2026-03-31 13F CORNING COM 219350105 74,465 66,026 782.39 10,125 1,271.95 0.0206
2026-01-23 2025-12-31 13F CORNING COM 219350105 8,439 2 0.02 739 6.65 0.0015
2025-11-06 2025-09-30 13F CORNING COM 219350105 8,437 1,473 21.15 692 89.07 0.0015
2025-08-04 2025-06-30 13F CORNING COM 219350105 6,964 5,733 465.72 366 553.57 0.0009
2025-05-06 2025-03-31 13F CORNING COM 219350105 1,231 155 14.41 56 9.80 0.0002
2025-02-06 2024-12-31 13F CORNING COM 219350105 1,076 542 101.50 51 112.50 0.0001
2024-11-01 2024-09-30 13F CORNING COM 219350105 534 211 65.33 24 100.00 0.0001
2024-08-13 2024-06-30 13F CORNING COM 219350105 323 84 35.15 13 71.43 0.0000
2024-05-07 2024-03-31 13F CORNING COM 219350105 239 -755 -75.96 8 -76.67 0.0000
2024-02-09 2023-12-31 13F CORNING COM 219350105 994 -439 -30.64 30 -30.23 0.0001
2023-10-27 2023-09-30 13F CORNING COM 219350105 1,433 500 53.59 44 34.38 0.0002
2023-08-11 2023-06-30 13F CORNING INC COM COM 219350105 933 -58,746 -98.44 33 -98.48 0.0001
2023-05-05 2023-03-31 13F CORNING INC COM COM 219350105 59,679 10,051 20.25 2,105 32.81 0.0087
2023-02-10 2022-12-31 13F CORNING COM 219350105 49,628 12,165 32.47 1,585 45.81 0.0069
2022-11-01 2022-09-30 13F CORNING COM 219350105 37,463 8,329 28.59 1,087 18.41 0.0051
2022-08-03 2022-06-30 13F CORNING INC COM COM 219350105 29,134 -9,989 -25.53 918 -36.43 0.0041
2022-05-13 2022-03-31 13F CORNING INC COM COM 219350105 39,123 20,184 106.57 1,444 104.82 0.0060
2022-02-14 2021-12-31 13F CORNING INC COM COM 219350105 18,939 13,788 267.68 705 275.00 0.0029
2021-11-12 2021-09-30 13F CORNING INC COM COM 219350105 5,151 3,536 218.95 188 184.85 0.0008
2021-08-16 2021-06-30 13F CORNING INC COM COM 219350105 1,615 0 0.00 66 -5.71 0.0003
2021-05-14 2021-03-31 13F CORNING COM 219350105 1,615 -4,268 -72.55 70 -66.98 0.0004
2021-02-10 2020-12-31 13F CORNING INC COM COM 219350105 5,883 -9 -0.15 212 10.99 0.0012
2020-11-13 2020-09-30 13F CORNING INC COM COM 219350105 5,892 833 16.47 191 45.80 0.0012
2020-08-11 2020-06-30 13F CORNING INC COM COM 219350105 5,059 998 24.58 131 57.83 0.0009
2020-05-12 2020-03-31 13F CORNING INC COM COM 219350105 4,061 568 16.26 83 -18.63 0.0007
2020-02-11 2019-12-31 13F CORNING INC COM COM 219350105 3,493 459 15.13 102 17.24 0.0008
2019-11-13 2019-09-30 13F CORNING INC COM COM 219350105 3,034 449 17.37 87 1.16 0.0007
2019-08-14 2019-06-30 13F CORNING INC COM COM 219350105 2,585 570 28.29 86 28.36 0.0007
2019-05-14 2019-03-31 13F CORNING INC COM COM 219350105 2,015 220 12.26 67 24.07 0.0006
2019-02-13 2018-12-31 13F CORNING INC COM COM 219350105 1,795 0 0.00 54 -14.29 0.0005
2018-11-13 2018-09-30 13F CORNING INC COM COM 219350105 1,795 0 0.00 63 28.57 0.0006
2018-08-01 2018-06-30 13F CORNING INC COM COM 219350105 1,795 0 0.00 49 -2.00 0.0005
2018-05-16 2018-03-31 13F CORNING INC COM COM 219350105 1,795 -673 -27.27 50 -36.71 0.0005
2018-02-13 2017-12-31 13F CORNING INC COM COM 219350105 2,468 492 24.90 79 33.90 0.0008
2017-11-08 2017-09-30 13F CORNING INC COM COM 219350105 1,976 -57,155 -96.66 59 -96.68 0.0007
2017-08-14 2017-06-30 13F CORNING INC COM COM 219350105 59,131 8,091 15.85 1,777 28.96 0.0224
2017-09-15 2017-03-31 13F/A-1 CORNING INC COM COM 219350105 51,040 47,583 1,376.42 1,378 1,540.48 0.0181
2017-05-08 2017-03-31 13F CORNING INC COM COM 219350105 51,040 47,583 1,378
2017-09-15 2016-12-31 13F/A-1 CORNING INC COM COM 219350105 3,457 1,662 92.59 84 100.00 0.0012
2017-02-14 2016-12-31 13F CORNING INC COM COM 219350105 3,457 1,662 84
2017-09-14 2016-09-30 13F/A-1 CORNING INC COM COM 219350105 1,795 -59 -3.18 42 10.53 0.0006
2016-11-04 2016-09-30 13F CORNING INC COM COM 219350105 1,795 -59 42
2017-09-14 2016-06-30 13F/A-1 CORNING INC COM COM 219350105 1,854 -403 -17.86 38 -19.15 0.0006
2016-08-08 2016-06-30 13F CORNING INC COM COM 219350105 1,854 -403 38
2017-09-14 2016-03-31 13F/A-1 CORNING INC COM COM 219350105 2,257 -51,702 -95.82 47 -95.23 0.0008
2016-05-13 2016-03-31 13F CORNING INC COM COM 219350105 2,257 -51,702 47
2017-09-14 2015-12-31 13F/A-1 CORNING INC COM COM 219350105 53,959 10,823 25.09 986 33.60 0.0183
2016-02-12 2015-12-31 13F CORNING INC COM COM 219350105 53,959 10,823 986
2016-01-05 2015-09-30 13F/A-1 CORNING INC COM COM 219350105 43,136 -45,954 -51.58 738 -58.02 0.0154
2015-11-10 2015-09-30 13F CORNING INC COM COM 219350105 43,136 738
2015-08-13 2015-06-30 13F CORNING INC COM COM 219350105 89,090 38,699 76.80 1,758 67.59 0.0366
2014-05-06 2014-03-31 13F CORNING INC COM COM 219350105 50,391 50,391 1,049 0.0256
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.