Corning Incorporated
MX ˙ BMV ˙ US2193501051
SecurityMX:GLW / Corning Incorporated
InstitutionKeystone Financial Group
Latest Disclosed Ownership12,115 shares
Latest Disclosed Value $ 1,647,226
Keystone Financial Group reports 144.60% increase in ownership of GLW / Corning Incorporated

On May 13, 2026 - Keystone Financial Group filed a 13F-HR form disclosing ownership of 12,115 shares of Corning Incorporated (MX:GLW) valued at $1,647,226 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 4,953 shares of Corning Incorporated. This represents a change in shares of 144.60% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-13 2026-03-31 13F CORNING Equtities 219350105 12,115 7,162 144.60 1,647 280.37 0.1108
2026-02-06 2025-12-31 13F CORNING Equities 219350105 4,953 -474 -8.73 434 -2.70 0.0321
2025-11-17 2025-09-30 13F/A-1 CORNING Common Stock 219350105 5,427 650 13.61 445 77.29 0.0340
2025-11-14 2025-09-30 13F CORNING Common Stock 219350105 4,777 0 251 0.0200
2025-08-13 2025-06-30 13F CORNING Common Stock 219350105 4,777 2 0.04 251 15.14 0.0227
2025-05-13 2025-03-31 13F CORNING Common Stock 219350105 4,775 2 0.04 219 -3.54 0.0222
2025-02-13 2024-12-31 13F CORNING Common Stock 219350105 4,773 -337 -6.59 227 -1.74 0.0223
2025-02-19 2024-09-30 13F/A-3 CORNING Common Stock 219350105 5,110 -197 -3.71 231 11.65 0.0295
2025-02-18 2024-09-30 13F/A-2 CORNING Common Stock 219350105 10,625 5,318 204 0.0265
2024-11-12 2024-09-30 13F CORNING Common Stock 219350105 5,110 -197 231 0.0762
2024-07-31 2024-06-30 13F CORNING Common Stock 219350105 5,307 5,307 206 0.0738
2021-08-13 2021-06-30 13F CORNING Common Stock 219350105 0 -4,608 -100.00 0 -100.00
2021-05-11 2021-03-31 13F CORNING Common Stock 219350105 4,608 4,608 200 0.0390
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.