CORNING INC · CUSIP 219350105 · CIK 919530
As of 2026-06-30, JOHN G ULLMAN & ASSOCIATES INC reported 233.87K GLW (shares), valued at $59.74M, or 7.25% of its reported non-derivative portfolio. Filed 2026-08-11.
Verify history & sources →Shares decreased 26.86%; reported value increased 37.40%, and weight changed +1.49 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds.
Left: % · Right: Shares · Independently scaled axes
Exact data and methodology
Axes scale independently; a crossing does not mean equal values. Weight uses each quarter's total reported non-derivative value. Same CUSIP; missing quarters are gaps, not zero. Revised history may include later disclosures.
| Quarter | Weight | Quantity | Source |
|---|---|---|---|
| Q2 2026 | 7.25% | 233,865 | SEC filing ↗Filed Aug 11, 2026 |
| Q1 2026 | 5.76% | 319,742 | SEC filing ↗Filed May 6, 2026 |
| Q4 2025 | 4.48% | 383,531 | SEC filing ↗Filed Feb 5, 2026 |
| Q3 2025 | 4.52% | 409,169 | SEC filing ↗Filed Nov 5, 2025 |
| Q2 2025 | 4.37% | 560,239 | SEC filing ↗Filed Jul 29, 2025 |
| Q1 2025 | 4.00% | 565,932 | SEC filing ↗Filed May 6, 2025 |
| Q4 2024 | 4.34% | 620,907 | SEC filing ↗Filed Feb 5, 2025 |
| Q3 2024 | 4.35% | 669,877 | SEC filing ↗Filed Nov 8, 2024 |
| Q2 2024 | 4.17% | 703,431 | SEC filing ↗Filed Aug 8, 2024 |
| Q1 2024 | 3.61% | 713,833 | SEC filing ↗Filed May 6, 2024 |
| Q4 2023 | 3.60% | 744,708 | SEC filing ↗Filed Jan 31, 2024 |
| Q3 2023 | 3.64% | 729,950 | SEC filing ↗Filed Nov 1, 2023 |
History & evidence by quarter
| Quarter | Weight | Quantity | Value | Change explained | Source |
|---|---|---|---|---|---|
| Q3 2023 | 3.64% | 729,950 | $22.24M | The prior quarter is outside the free window. Sign in for the comparison. | SEC filing ↗ Filed Nov 1, 2023 |
| Q4 2023 | 3.60% | 744,708 | $22.68M | Shares increased 2.02%; reported value increased 1.95%, and weight changed -0.04 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Jan 31, 2024 |
| Q1 2024 | 3.61% | 713,833 | $23.53M | Shares decreased 4.15%; reported value increased 3.76%, and weight changed +0.01 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed May 6, 2024 |
| Q2 2024 | 4.17% | 703,431 | $27.33M | Shares decreased 1.46%; reported value increased 16.15%, and weight changed +0.56 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Aug 8, 2024 |
| Q3 2024 | 4.35% | 669,877 | $30.24M | Shares decreased 4.77%; reported value increased 10.67%, and weight changed +0.18 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Nov 8, 2024 |
| Q4 2024 | 4.34% | 620,907 | $29.51M | Shares decreased 7.31%; reported value decreased 2.44%, and weight changed -0.01 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Feb 5, 2025 |
| Q1 2025 | 4.00% | 565,932 | $25.91M | Shares decreased 8.85%; reported value decreased 12.19%, and weight changed -0.34 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed May 6, 2025 |
| Q2 2025 | 4.37% | 560,239 | $29.46M | Shares decreased 1.01%; reported value increased 13.72%, and weight changed +0.37 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Jul 29, 2025 |
| Q3 2025 | 4.52% | 409,169 | $33.56M | Shares decreased 26.97%; reported value increased 13.92%, and weight changed +0.15 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Nov 5, 2025 |
| Q4 2025 | 4.48% | 383,531 | $33.58M | Shares decreased 6.27%; reported value increased 0.05%, and weight changed -0.04 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Feb 5, 2026 |
| Q1 2026 | 5.76% | 319,742 | $43.48M | Shares decreased 16.63%; reported value increased 29.46%, and weight changed +1.28 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed May 6, 2026 |
| Q2 2026 | 7.25% | 233,865 | $59.74M | Shares decreased 26.86%; reported value increased 37.40%, and weight changed +1.49 pp. Weight depends on both the security valuation and total portfolio value, not trade proceeds. | SEC filing ↗ Filed Aug 11, 2026 |
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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.