Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionGreat Valley Advisor Group, Inc.
Latest Disclosed Ownership10,709 shares
Latest Disclosed Value $ 1,456,535
Great Valley Advisor Group, Inc. reports 5.89% increase in ownership of GLW / Corning Incorporated

On May 11, 2026 - Great Valley Advisor Group, Inc. filed a 13F-HR form disclosing ownership of 10,709 shares of Corning Incorporated (MX:GLW) valued at $1,456,535 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 10,113 shares of Corning Incorporated. This represents a change in shares of 5.89% 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)
2026-05-11 2026-03-31 13F CORNING COM 219350105 10,709 596 5.89 1,457 64.52 0.0265
2026-02-12 2025-12-31 13F CORNING COM 219350105 10,113 832 8.96 885 16.29 0.0170
2025-11-14 2025-09-30 13F CORNING COM 219350105 9,281 298 3.32 761 61.23 0.0153
2025-08-14 2025-06-30 13F CORNING COM 219350105 8,983 -3,623 -28.74 472 -18.20 0.0105
2025-05-08 2025-03-31 13F CORNING COM 219350105 12,606 1,241 10.92 577 6.85 0.0124
2025-02-24 2024-12-31 13F CORNING COM 219350105 11,365 -216 -1.87 540 3.45 0.0121
2024-11-12 2024-09-30 13F CORNING COM 219350105 11,581 5,835 101.55 523 134.08 0.0129
2024-07-16 2024-06-30 13F CORNING COM 219350105 5,746 5,746 223 0.0062
2023-11-06 2023-09-30 13F CORNING COM 219350105 0 -7,359 -100.00 0 -100.00
2023-08-10 2023-06-30 13F CORNING COM 219350105 7,359 556 8.17 258 7.53 0.0108
2023-05-03 2023-03-31 13F CORNING COM 219350105 6,803 6,803 240 0.0112
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.