Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionHartland & Co., LLC
Latest Disclosed Ownership41,499 shares
Latest Disclosed Value $ 5,642,592
Hartland & Co., LLC reports 3.83% increase in ownership of GLW / Corning Incorporated

On May 6, 2026 - Hartland & Co., LLC filed a 13F-HR form disclosing ownership of 41,499 shares of Corning Incorporated (MX:GLW) valued at $5,642,592 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 39,968 shares of Corning Incorporated. This represents a change in shares of 3.83% 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)
2026-05-06 2026-03-31 13F CORNING COM 219350105 41,499 1,531 3.83 5,643 61.25 0.0515
2026-02-09 2025-12-31 13F CORNING COM 219350105 39,968 -2,662 -6.24 3,500 0.09 0.0441
2025-11-10 2025-09-30 13F CORNING COM 219350105 42,630 -879 -2.02 3,497 52.80 0.0459
2025-08-08 2025-06-30 13F CORNING COM 219350105 43,509 3,037 7.50 2,288 23.54 0.0321
2025-05-13 2025-03-31 13F CORNING COM 219350105 40,472 2,177 5.68 1,853 1.81 0.0287
2025-02-10 2024-12-31 13F CORNING COM 219350105 38,295 -330 -0.85 1,820 4.36 0.0276
2024-11-13 2024-09-30 13F CORNING COM 219350105 38,625 626 1.65 1,744 18.09 0.0271
2024-08-12 2024-06-30 13F CORNING COM 219350105 37,999 28,382 295.12 1,476 348.63 0.0252
2024-05-14 2024-03-31 13F CORNING COM 219350105 9,617 1,076 12.60 330 26.54 0.0163
2024-02-12 2023-12-31 13F CORNING COM 219350105 8,541 -284 -3.22 260 -2.99 0.0138
2023-11-13 2023-09-30 13F/A-1 CORNING COM 219350105 8,825 116 1.33 269 -12.13 0.0165
2023-11-07 2023-09-30 13F CORNING COM 219350105 27,258 18,549 831 0.0457
2023-08-07 2023-06-30 13F CORNING COM 219350105 8,709 -2,468 -22.08 305 -22.59 0.0185
2023-05-09 2023-03-31 13F CORNING COM 219350105 11,177 -1,821 -14.01 394 -5.06 0.0287
2023-02-14 2022-12-31 13F CORNING COM 219350105 12,998 2,692 26.12 415 38.80 0.0325
2022-11-15 2022-09-30 13F CORNING COM 219350105 10,306 -16,214 -61.14 299 -64.23 0.0275
2022-08-12 2022-06-30 13F CORNING COM 219350105 26,520 3,128 13.37 836 -3.13 0.0652
2022-05-04 2022-03-31 13F CORNING COM 219350105 23,392 2,357 11.21 863 10.22 0.0585
2022-02-14 2021-12-31 13F CORNING COM 219350105 21,035 46 0.22 783 2.22 0.0532
2021-11-12 2021-09-30 13F CORNING COM 219350105 20,989 225 1.08 766 -9.78 0.0571
2021-08-12 2021-06-30 13F CORNING COM 219350105 20,764 132 0.64 849 -5.46 0.0653
2021-05-14 2021-03-31 13F CORNING COM 219350105 20,632 827 4.18 898 25.95 0.0748
2021-02-11 2020-12-31 13F CORNING COM 219350105 19,805 14,090 246.54 713 285.41 0.0648
2020-11-12 2020-09-30 13F CORNING COM 219350105 5,715 -2,920 -33.82 185 -17.41 0.0198
2020-08-11 2020-06-30 13F CORNING COM 219350105 8,635 726 9.18 224 38.27 0.0259
2020-05-14 2020-03-31 13F CORNING COM 219350105 7,909 0 0.00 162 -29.57 0.0236
2020-02-11 2019-12-31 13F CORNING COM 219350105 7,909 -421 -5.05 230 -3.36 0.0279
2019-11-12 2019-09-30 13F CORNING COM 219350105 8,330 -445 -5.07 238 -18.49 0.0319
2019-08-08 2019-06-30 13F CORNING COM 219350105 8,775 -745 -7.83 292 -7.30 0.0389
2019-05-14 2019-03-31 13F CORNING COM 219350105 9,520 1,330 16.24 315 27.53 0.0434
2019-02-08 2018-12-31 13F CORNING COM 219350105 8,190 -2,246 -21.52 247 -32.88 0.0385
2018-11-13 2018-09-30 13F CORNING COM 219350105 10,436 -2,100 -16.75 368 6.67 0.0505
2018-08-07 2018-06-30 13F CORNING COM 219350105 12,536 -108 -0.85 345 -2.27 0.0492
2018-05-14 2018-03-31 13F CORNING COM 219350105 12,644 6,083 92.71 353 68.10 0.0512
2018-02-09 2017-12-31 13F CORNING COM 219350105 6,561 -875 -11.77 210 -5.41 0.0285
2017-11-09 2017-09-30 13F CORNING COM 219350105 7,436 0 0.00 222 -0.45 0.0289
2017-08-03 2017-06-30 13F CORNING COM 219350105 7,436 0 0.00 223 10.95 0.0326
2017-05-11 2017-03-31 13F CORNING COM 219350105 7,436 -21,148 -73.99 201 -71.04 0.0292
2017-02-10 2016-12-31 13F CORNING COM 219350105 28,584 28,584 694 0.1123
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.