Stefan Becker
CIK 1825967 · View on SEC EDGAR ↗
Insider
First SEC filing: Oct. 9, 2020 · Latest: May 14, 2026
On this page
Insider at
Insider transactions
0 buys (P)
2 sells (S)
Net:
$-5,054,168
+ 94 non-open-market transactions below
last 12 months, based on the transactions shown below
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
94 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| May 8, 2026 | GLW | S | 21,000 | $188.08 | $3,949,680 | 7,263 Direct | -74.30% | Disposed | -18.7% (price as of 2026-08-19) |
| Oct. 29, 2025 | GLW | S | 12,100 | $91.28 | $1,104,488 | 5,049 Direct | -70.56% | Disposed | 67.4% (price as of 2026-08-19) |
| May 29, 2025 | GLW | S | 17,106 | $49.68 | $849,826 | 16,117 Direct | -51.49% | Disposed | 207.6% (price as of 2026-08-19) |
| Oct. 30, 2024 | GLW | S | 24,077 | $48.62 | $1,170,624 | 15,729 Direct | -60.49% | Disposed | 214.4% (price as of 2026-08-19) |
| Aug. 14, 2024 | GLW | S | 17,938 | $39.51 | $708,730 | 26,782 Direct | -40.11% | Disposed | 286.8% (price as of 2026-08-19) |
| Aug. 14, 2024 | GLW | S | 17,983 | $39.51 | $710,508 | 26,737 Direct | -40.21% | Disposed | 286.8% (price as of 2026-08-19) |
Showing latest 100 of 108 transactions
P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding
Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.
Derivative holdings (Form 4 Table II)
Options, RSUs and convertible securities reported on Form 4 Table II.
| Date | Ticker | Security | Underlying | Exercise price | Expiration | Shares | A/D |
|---|---|---|---|---|---|---|---|
| April 29, 2026 | GLW | Performance Share Unit | Common Stock (429) | — | — | 429 | Disposed |
| April 29, 2026 | GLW | Performance Share Unit | Common Stock (1,073) | — | — | 1,073 | Disposed |
| April 29, 2026 | GLW | Restricted Stock Unit | Common Stock (619) | — | — | 619 | Disposed |
| April 29, 2026 | GLW | Restricted Stock Unit | Common Stock (674) | — | — | 674 | Disposed |
| April 15, 2026 | GLW | Restricted Stock Unit | Common Stock (13,734) | — | — | 13,734 | Disposed |
| April 15, 2026 | GLW | Performance Share Unit | Common Stock (31,046) | — | — | 31,046 | Disposed |
| April 1, 2026 | GLW | Restricted Stock Unit | Common Stock (4,846) | — | — | 4,846 | Acquired |
| Feb. 9, 2026 | GLW | Restricted Stock Unit | Common Stock (2,110) | — | — | 2,110 | Disposed |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (15,225) | — | — | 15,225 | Acquired |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (10,182) | — | — | 10,182 | Acquired |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (9,359) | — | — | 9,359 | Acquired |
| Aug. 8, 2025 | GLW | Restricted Stock Unit | Common Stock (2,110) | — | — | 2,110 | Disposed |
| April 15, 2025 | GLW | Restricted Stock Unit | Common Stock (13,201) | — | — | 13,201 | Disposed |
| April 15, 2025 | GLW | Performance Share Unit | Common Stock (19,694) | — | — | 19,694 | Disposed |
| April 1, 2025 | GLW | Restricted Stock Unit | Common Stock (13,505) | — | — | 13,505 | Acquired |
| Feb. 10, 2025 | GLW | Restricted Stock Unit | Common Stock (2,109) | — | — | 2,109 | Disposed |
| Feb. 4, 2025 | GLW | Performance Share Unit | Common Stock (13,456) | — | — | 13,456 | Acquired |
| Feb. 4, 2025 | GLW | Performance Share Unit | Common Stock (12,360) | — | — | 12,360 | Acquired |
| Feb. 4, 2025 | GLW | Performance Share Unit | Common Stock (13,224) | — | — | 13,224 | Acquired |
| Oct. 30, 2024 | GLW | Stock Options (Right to Buy) | Common Stock (4,225) | $19.65 | May 15, 2030 | 4,225 | Disposed |
| Oct. 30, 2024 | GLW | Stock Options (Right to Buy) | Common Stock (8,844) | $33.92 | April 1, 2029 | 8,844 | Disposed |
| Aug. 8, 2024 | GLW | Restricted Stock Unit | Common Stock (1,315) | — | — | 1,315 | Disposed |
| Aug. 8, 2024 | GLW | Restricted Stock Unit | Common Stock (2,109) | — | — | 2,109 | Disposed |
| April 15, 2024 | GLW | Performance Share Unit | Common Stock (8,777) | — | — | 8,777 | Disposed |
| April 15, 2024 | GLW | Restricted Stock Unit | Common Stock (6,138) | — | — | 6,138 | Disposed |
| April 1, 2024 | GLW | Restricted Stock Unit | Common Stock (14,692) | — | — | 14,692 | Acquired |
| Feb. 8, 2024 | GLW | Restricted Stock Unit | Common Stock (2,630) | — | — | 2,630 | Disposed |
| Feb. 8, 2024 | GLW | Restricted Stock Unit | Common Stock (4,219) | — | — | 4,219 | Disposed |
| Feb. 7, 2024 | GLW | Performance Share Unit | Common Stock (2,590) | — | — | 2,590 | Acquired |
| Feb. 7, 2024 | GLW | Performance Share Unit | Common Stock (3,327) | — | — | 3,327 | Acquired |
| Feb. 7, 2024 | GLW | Performance Share Unit | Common Stock (3,461) | — | — | 3,461 | Acquired |
| May 15, 2023 | GLW | Restricted Stock Unit | Common Stock (563) | — | — | 563 | Disposed |
| May 15, 2023 | GLW | Restricted Stock Unit | Common Stock (3,574) | — | — | 3,574 | Disposed |
| April 14, 2023 | GLW | Restricted Stock Unit | Common Stock (9,419) | — | — | 9,419 | Disposed |
| April 14, 2023 | GLW | Performance Share Unit | Common Stock (20,982) | — | — | 20,982 | Disposed |
| April 3, 2023 | GLW | Restricted Stock Unit | Common Stock (13,734) | — | — | 13,734 | Acquired |
| Feb. 8, 2023 | GLW | Restricted Stock Unit | Common Stock (3,945) | — | — | 3,945 | Acquired |
| Feb. 8, 2023 | GLW | Performance Share Unit | Common Stock (5,892) | — | — | 5,892 | Acquired |
| Feb. 8, 2023 | GLW | Performance Share Unit | Common Stock (1,353) | — | — | 1,353 | Acquired |
| Feb. 8, 2023 | GLW | Performance Share Unit | Common Stock (2,911) | — | — | 2,911 | Acquired |
| Feb. 8, 2023 | GLW | Restricted Stock Unit | Common Stock (12,657) | — | — | 12,657 | Acquired |
| May 16, 2022 | GLW | Restricted Stock Unit | Common Stock (563) | — | — | 563 | Disposed |
| May 16, 2022 | GLW | Restricted Stock Unit | Common Stock (3,574) | — | — | 3,574 | Disposed |
| April 18, 2022 | GLW | Restricted Stock Unit | Common Stock (4,422) | — | — | 4,422 | Disposed |
| April 1, 2022 | GLW | Restricted Stock Unit | Common Stock (13,201) | — | — | 13,201 | Acquired |
| Feb. 2, 2022 | GLW | Performance Share Unit | Common Stock (4,834) | — | — | 4,834 | Acquired |
| Feb. 2, 2022 | GLW | Performance Share Unit | Common Stock (7,418) | — | — | 7,418 | Acquired |
| May 17, 2021 | GLW | Restricted Stock Unit | Common Stock (564) | — | — | 564 | Disposed |
| May 17, 2021 | GLW | Restricted Stock Unit | Common Stock (3,575) | — | — | 3,575 | Disposed |
| April 29, 2021 | GLW | Stock Options (Right to Buy) | Common Stock (4,225) | $19.65 | May 15, 2030 | 4,225 | Disposed |
| April 29, 2021 | GLW | Stock Options (Right to Buy) | Common Stock (8,741) | $27.03 | April 2, 2028 | 8,741 | Disposed |
| April 15, 2021 | GLW | Restricted Stock Unit | Common Stock (4,856) | — | — | 4,856 | Disposed |
| April 1, 2021 | GLW | Restricted Stock Unit | Common Stock (6,138) | — | — | 6,138 | Acquired |
| Feb. 3, 2021 | GLW | Performance Share Unit | Common Stock (7,672) | — | — | 7,672 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 8 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (4,856) | 4,856 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (4,422) | 4,422 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (9,419) | 9,419 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (10,732) | 10,732 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (1,690) | 1,690 | Direct |
| Oct. 9, 2020 | GLW | Stock Options (Right to Buy)→ Common Stock (8,741) | 8,741 | Direct |
| Oct. 9, 2020 | GLW | Stock Options (Right to Buy)→ Common Stock (8,844) | 8,844 | Direct |
| Oct. 9, 2020 | GLW | Stock Options (Right to Buy)→ Common Stock (8,450) | 8,450 | Direct |