Ronald L Verkleeren
CIK 1825613 · 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:
$-4,066,190
+ 97 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
97 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| May 13, 2026 | GLW | S | 10,000 | $207.77 | $2,077,700 | 48,143 Direct | -17.20% | Disposed | -26.1% (price as of 2026-08-21) |
| Dec. 10, 2025 | GLW | S | 21,000 | $94.69 | $1,988,490 | 34,500 Direct | -37.84% | Disposed | 62.2% (price as of 2026-08-21) |
| June 11, 2025 | GLW | S | 20,000 | $50.52 | $1,010,400 | 54,288 Direct | -26.92% | Disposed | 204.0% (price as of 2026-08-21) |
Showing latest 100 of 109 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 15, 2026 | GLW | Restricted Stock Unit | Common Stock (14,332) | — | — | 14,332 | Disposed |
| April 15, 2026 | GLW | Performance Share Unit | Common Stock (32,571) | — | — | 32,571 | Disposed |
| April 1, 2026 | GLW | Restricted Stock Unit | Common Stock (4,056) | — | — | 4,056 | Acquired |
| Feb. 9, 2026 | GLW | Restricted Stock Unit | Common Stock (2,476) | — | — | 2,476 | Disposed |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (591) | — | — | 591 | Disposed |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (395) | — | — | 395 | Disposed |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (300) | — | — | 300 | Disposed |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (16,650) | — | — | 16,650 | Acquired |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (11,137) | — | — | 11,137 | Acquired |
| Feb. 4, 2026 | GLW | Performance Share Unit | Common Stock (8,445) | — | — | 8,445 | Acquired |
| Jan. 2, 2026 | GLW | Restricted Stock Unit | Common Stock (575) | — | — | 575 | Disposed |
| Nov. 21, 2025 | GLW | Performance Share Unit | Common Stock (663) | — | — | 663 | Disposed |
| Nov. 21, 2025 | GLW | Performance Share Unit | Common Stock (794) | — | — | 794 | Disposed |
| Nov. 21, 2025 | GLW | Restricted Stock Unit | Common Stock (737) | — | — | 737 | Disposed |
| Nov. 21, 2025 | GLW | Restricted Stock Unit | Common Stock (689) | — | — | 689 | Disposed |
| Aug. 8, 2025 | GLW | Restricted Stock Unit | Common Stock (2,476) | — | — | 2,476 | Disposed |
| April 15, 2025 | GLW | Restricted Stock Unit | Common Stock (14,439) | — | — | 14,439 | Disposed |
| April 15, 2025 | GLW | Performance Share Unit | Common Stock (21,539) | — | — | 21,539 | Disposed |
| April 1, 2025 | GLW | Restricted Stock Unit | Common Stock (12,187) | — | — | 12,187 | Acquired |
| Feb. 10, 2025 | GLW | Restricted Stock Unit | Common Stock (2,475) | — | — | 2,475 | Disposed |
| Feb. 4, 2025 | GLW | Performance Share Unit | Common Stock (14,717) | — | — | 14,717 | Acquired |
| Feb. 4, 2025 | GLW | Performance Share Unit | Common Stock (13,520) | — | — | 13,520 | Acquired |
| Feb. 4, 2025 | GLW | Performance Share Unit | Common Stock (14,464) | — | — | 14,464 | Acquired |
| Aug. 8, 2024 | GLW | Restricted Stock Unit | Common Stock (1,441) | — | — | 1,441 | Disposed |
| Aug. 8, 2024 | GLW | Restricted Stock Unit | Common Stock (2,475) | — | — | 2,475 | Disposed |
| April 15, 2024 | GLW | Performance Share Unit | Common Stock (13,652) | — | — | 13,652 | Disposed |
| April 15, 2024 | GLW | Restricted Stock Unit | Common Stock (9,548) | — | — | 9,548 | Disposed |
| April 1, 2024 | GLW | Restricted Stock Unit | Common Stock (16,070) | — | — | 16,070 | Acquired |
| Feb. 8, 2024 | GLW | Restricted Stock Unit | Common Stock (2,880) | — | — | 2,880 | Disposed |
| Feb. 8, 2024 | GLW | Restricted Stock Unit | Common Stock (4,951) | — | — | 4,951 | Disposed |
| Feb. 7, 2024 | GLW | Performance Share Unit | Common Stock (4,029) | — | — | 4,029 | Acquired |
| Feb. 7, 2024 | GLW | Performance Share Unit | Common Stock (3,638) | — | — | 3,638 | Acquired |
| Feb. 7, 2024 | GLW | Performance Share Unit | Common Stock (3,786) | — | — | 3,786 | Acquired |
| May 15, 2023 | GLW | Restricted Stock Unit | Common Stock (508) | — | — | 508 | Disposed |
| May 15, 2023 | GLW | Restricted Stock Unit | Common Stock (2,934) | — | — | 2,934 | Disposed |
| April 14, 2023 | GLW | Performance Share Unit | Common Stock (26,624) | — | — | 26,624 | Disposed |
| April 14, 2023 | GLW | Restricted Stock Unit | Common Stock (8,634) | — | — | 8,634 | Disposed |
| April 14, 2023 | GLW | Restricted Stock Unit | Common Stock (3,319) | — | — | 3,319 | Disposed |
| April 3, 2023 | GLW | Restricted Stock Unit | Common Stock (15,021) | — | — | 15,021 | Acquired |
| Feb. 8, 2023 | GLW | Performance Share Unit | Common Stock (7,477) | — | — | 7,477 | Acquired |
| Feb. 8, 2023 | GLW | Performance Share Unit | Common Stock (2,105) | — | — | 2,105 | Acquired |
| Feb. 8, 2023 | GLW | Performance Share Unit | Common Stock (3,184) | — | — | 3,184 | Acquired |
| Feb. 8, 2023 | GLW | Restricted Stock Unit | Common Stock (14,853) | — | — | 14,853 | Acquired |
| Feb. 8, 2023 | GLW | Restricted Stock Unit | Common Stock (4,321) | — | — | 4,321 | Acquired |
| May 16, 2022 | GLW | Restricted Stock Unit | Common Stock (508) | — | — | 508 | Disposed |
| May 16, 2022 | GLW | Restricted Stock Unit | Common Stock (2,934) | — | — | 2,934 | Disposed |
| April 18, 2022 | GLW | Restricted Stock Unit | Common Stock (4,054) | — | — | 4,054 | Disposed |
| April 1, 2022 | GLW | Restricted Stock Unit | Common Stock (14,439) | — | — | 14,439 | Acquired |
| Feb. 2, 2022 | GLW | Performance Share Unit | Common Stock (7,518) | — | — | 7,518 | Acquired |
| Feb. 2, 2022 | GLW | Performance Share Unit | Common Stock (9,412) | — | — | 9,412 | Acquired |
| May 17, 2021 | GLW | Restricted Stock Unit | Common Stock (509) | — | — | 509 | Disposed |
| May 17, 2021 | GLW | Restricted Stock Unit | Common Stock (2,934) | — | — | 2,934 | Disposed |
| April 15, 2021 | GLW | Restricted Stock Unit | Common Stock (5,087) | — | — | 5,087 | Disposed |
| April 1, 2021 | GLW | Restricted Stock Unit | Common Stock (9,548) | — | — | 9,548 | Acquired |
| Feb. 3, 2021 | GLW | Performance Share Unit | Common Stock (9,735) | — | — | 9,735 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 10 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Oct. 9, 2020 | GLW | Common Stock | 5,448 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (5,087) | 5,087 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (4,054) | 4,054 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (8,634) | 8,634 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (1,525) | 1,525 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (8,802) | 8,802 | Direct |
| Oct. 9, 2020 | GLW | Restricted Stock Unit→ Common Stock (3,319) | 3,319 | Direct |
| Oct. 9, 2020 | GLW | Stock Options (Right to Buy)→ Common Stock (9,157) | 9,157 | Direct |
| Oct. 9, 2020 | GLW | Stock Options (Right to Buy)→ Common Stock (8,107) | 8,107 | Direct |
| Oct. 9, 2020 | GLW | Stock Options (Right to Buy)→ Common Stock (7,625) | 7,625 | Direct |