Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionNorthwestern Mutual Wealth Management Co
Latest Disclosed Ownership107,547 shares
Latest Disclosed Value $ 14,623,196
Northwestern Mutual Wealth Management Co reports 11.10% increase in ownership of GLW / Corning Incorporated

On May 7, 2026 - Northwestern Mutual Wealth Management Co filed a 13F-HR form disclosing ownership of 107,547 shares of Corning Incorporated (MX:GLW) valued at $14,623,196 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 10, 2026 disclosing 96,802 shares of Corning Incorporated. This represents a change in shares of 11.10% 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 107,547 10,745 11.10 14,623 72.54 0.0090
2026-02-10 2025-12-31 13F/A-1 CORNING COM 219350105 96,802 3,752 4.03 8,476 11.05 0.0054
2026-02-05 2025-12-31 13F CORNING COM 219350105 33,851 -59,199 1,856 0.0012
2025-11-14 2025-09-30 13F CORNING COM 219350105 93,050 13,784 17.39 7,633 83.11 0.0051
2025-08-13 2025-06-30 13F CORNING COM 219350105 79,266 1,801 2.32 4,169 17.54 0.0030
2025-05-14 2025-03-31 13F CORNING COM 219350105 77,465 -1,739 -2.20 3,546 -5.77 0.0029
2025-02-11 2024-12-31 13F CORNING COM 219350105 79,204 2,231 2.90 3,764 8.29 0.0032
2024-11-12 2024-09-30 13F CORNING COM 219350105 76,973 3,184 4.32 3,475 21.25 0.0031
2024-08-16 2024-06-30 13F CORNING COM 219350105 73,789 844 1.16 2,867 19.22 0.0028
2024-05-15 2024-03-31 13F CORNING COM 219350105 72,945 -269 -0.37 2,404 7.85 0.0025
2024-02-13 2023-12-31 13F CORNING COM 219350105 73,214 -59,735 -44.93 2,229 -44.96 0.0025
2023-11-14 2023-09-30 13F CORNING COM 219350105 132,949 18,458 16.12 4,051 0.97 0.0053
2023-08-14 2023-06-30 13F CORNING COM 219350105 114,491 34,429 43.00 4,012 42.03 0.0052
2023-05-15 2023-03-31 13F CORNING COM 219350105 80,062 2,083 2.67 2,825 13.41 0.0039
2023-02-21 2022-12-31 13F CORNING COM 219350105 77,979 -1,778 -2.23 2,491 7.56 0.0038
2022-11-14 2022-09-30 13F CORNING COM 219350105 79,757 7,701 10.69 2,315 1.98 0.0040
2022-08-04 2022-06-30 13F CORNING COM 219350105 72,056 7,307 11.29 2,270 -5.02 0.0039
2022-05-09 2022-03-31 13F CORNING COM 219350105 64,749 -3,914 -5.70 2,390 -6.49 0.0038
2022-02-03 2021-12-31 13F CORNING COM 219350105 68,663 3,757 5.79 2,556 7.94 0.0042
2021-11-15 2021-09-30 13F CORNING COM 219350105 64,906 4,793 7.97 2,368 -3.66 0.0043
2021-08-13 2021-06-30 13F CORNING COM 219350105 60,113 -1,774 -2.87 2,458 -8.76 0.0047
2021-05-14 2021-03-31 13F CORNING COM 219350105 61,887 -1,594 -2.51 2,694 17.85 0.0057
2021-02-12 2020-12-31 13F CORNING COM 219350105 63,481 -641 -1.00 2,286 10.01 0.0053
2020-11-13 2020-09-30 13F CORNING COM 219350105 64,122 3,577 5.91 2,078 32.53 0.0056
2020-08-14 2020-06-30 13F CORNING COM 219350105 60,545 2,253 3.87 1,568 30.88 0.0048
2020-05-08 2020-03-31 13F CORNING COM 219350105 58,292 -3,392 -5.50 1,198 -33.26 0.0046
2020-02-13 2019-12-31 13F CORNING COM 219350105 61,684 4,931 8.69 1,795 10.87 0.0061
2019-11-12 2019-09-30 13F CORNING COM 219350105 56,753 -7,452 -11.61 1,619 -24.13 0.0062
2019-08-12 2019-06-30 13F CORNING COM 219350105 64,205 223 0.35 2,134 0.76 0.0086
2019-05-10 2019-03-31 13F CORNING COM 219350105 63,982 14,651 29.70 2,118 42.15 0.0093
2019-02-12 2018-12-31 13F CORNING COM 219350105 49,331 447 0.91 1,490 -13.62 0.0075
2018-11-01 2018-09-30 13F CORNING COM 219350105 48,884 421 0.87 1,725 29.41 0.0087
2018-08-10 2018-06-30 13F CORNING COM 219350105 48,463 -3,035 -5.89 1,333 -7.11 0.0075
2018-05-14 2018-03-31 13F CORNING COM 219350105 51,498 7,826 17.92 1,435 2.72 0.0087
2018-01-31 2017-12-31 13F CORNING COM 219350105 43,672 6,196 16.53 1,397 24.62 0.0089
2017-11-07 2017-09-30 13F CORNING COM 219350105 37,476 -44 -0.12 1,121 -0.53 0.0080
2017-08-10 2017-06-30 13F CORNING COM 219350105 37,520 3,909 11.63 1,127 24.26 0.0090
2017-05-09 2017-03-31 13F CORNING COM 219350105 33,611 6,475 23.86 907 37.22 0.0082
2017-02-15 2016-12-31 13F CORNING COM 219350105 27,136 -393 -1.43 661 1.38 0.0072
2016-11-14 2016-09-30 13F CORNING COM 219350105 27,529 1,651 6.38 652 23.25 0.0100
2016-08-29 2016-06-30 13F CORNING COM 219350105 25,878 2,534 10.86 529 9.07 0.0076
2016-05-16 2016-03-31 13F CORNING COM 219350105 23,344 -400 -1.68 485 11.49 0.0079
2016-02-16 2015-12-31 13F CORNING COM 219350105 23,744 -7 -0.03 435 6.88 0.0087
2015-11-16 2015-09-30 13F CORNING COM 219350105 23,751 -7,561 -24.15 407 -33.82 0.0097
2015-09-30 2015-06-30 13F/A-1 CORNING COM 219350105 31,312 -1,376 -4.21 615 -17.00 0.0160
2015-08-14 2015-06-30 13F CORNING COM 219350105 35,908 794
2015-05-15 2015-03-31 13F CORNING COM 219350105 32,688 10,745 48.97 741 47.32 0.0207
2015-02-13 2014-12-31 13F CORNING COM 219350105 21,943 -14,870 -40.39 503 -29.35 0.0155
2014-11-14 2014-09-30 13F CORNING COM 219350105 36,813 17,243 88.11 712 65.58 0.0249
2014-08-05 2014-06-30 13F CORNING COM 219350105 19,570 -1,007 -4.89 430 0.47 0.0168
2014-05-15 2014-03-31 13F CORNING COM 219350105 20,577 3,490 20.42 428 40.79 0.0179
2014-02-14 2013-12-31 13F CORNING COM 219350105 17,087 4,395 34.63 304 65.22 0.0138
2013-11-14 2013-09-30 13F CORNING COM 219350105 12,692 -5,420 -29.92 184 -28.68 0.0097
2013-08-21 2013-06-30 13F/A-1 CORNING COM 219350105 18,112 18,112 258 0.0154
2013-08-14 2013-06-30 13F CORNING COM 219350105 311,880 4,438 0.0488
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.