As of August 29, 2026, the three largest insider holders of NKTR are Jillian B. Thomsen (Chief Financial Officer, 313.50K shares), John Northcott (Svp Chief Commercial Officer, 223.21K shares), Roy A Whitfield (Director, 216.25K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Jillian B. Thomsen | Chief Financial Officer | 313,497 | 0 | 313,497 | 32.3% | 17 Feb, 2023 |
| 2 | John Northcott | Svp Chief Commercial Officer | 223,210 | 0 | 223,210 | 23.0% | 17 May, 2022 |
| 3 | Roy A Whitfield | Director | 216,250 | 0 | 216,250 | 22.3% | 15 Jun, 2023 |
| 4 | Howard W Robin | President Ceo | 54,627 | 0 | 54,627 | 5.6% | 20 Aug, 2026 |
| 5 | Gil M Labrucherie | Svp, Coo Cfo | 41,723 | 0 | 41,723 | 4.3% | 17 May, 2022 |
| 6 | R Scott Greer | Director | 40,479 | 0 | 40,479 | 4.2% | 20 Sep, 2022 |
| 7 | Robert Chess | Chairman Of The Board | 34,038 | 0 | 34,038 | 3.5% | 14 Jun, 2024 |
| 8 | Mark Andrew Wilson | Chief Legal Officer | 21,585 | 0 | 21,585 | 2.2% | 25 Nov, 2025 |
| 9 | Jonathan Zalevsky | Chief Rd Officer | 9,570 | 0 | 9,570 | 1.0% | 20 Aug, 2026 |
| 10 | Jeffrey Robert Ajer | Director | 4,554 | 0 | 4,554 | 0.5% | 20 Sep, 2022 |
| 11 | Diana Brainard | Director | 3,808 | 0 | 3,808 | 0.4% | 20 Sep, 2022 |
| 12 | Myriam Curet | Director | 3,656 | 0 | 3,656 | 0.4% | 20 Sep, 2023 |
| 13 | Karin Eastham | Director | 3,098 | 0 | 3,098 | 0.3% | 20 Sep, 2022 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 18 Aug, 2026 | Jonathan Zalevsky | Chief Rd Officer | Disposed S | 186 | $71.98 | $13.39K | 9,570 | Direct |
| 18 Aug, 2026 | Howard W Robin | President Ceo | Disposed S | 418 | $71.98 | $30.09K | 54,627 | Direct |
| 24 Jul, 2026 | Jonathan Zalevsky | Chief Rd Officer | Acquired A | 16,500 | $0.00 | $0 | 16,500 | Direct |
| 24 Jul, 2026 | Howard W Robin | President Ceo | Acquired A | 57,200 | $0.00 | $0 | 57,200 | Direct |
| 30 Jun, 2026 | Jonathan Zalevsky | Chief Rd Officer | Disposed S | 5,681 | $70.00 | $397.67K | 9,756 | Direct |
| 16 Jun, 2026 | Howard W Robin | President Ceo | Disposed S | 5,303 | $59.97 | $318.02K | 69,742 | Direct |
| 16 Jun, 2026 | Howard W Robin | President Ceo | Disposed S | 4,697 | $60.71 | $285.15K | 65,045 | Direct |
| 17 Jun, 2026 | Howard W Robin | President Ceo | Disposed S | 5,500 | $60.81 | $334.46K | 59,545 | Direct |
| 17 Jun, 2026 | Howard W Robin | President Ceo | Disposed S | 4,500 | $61.65 | $277.43K | 55,045 | Direct |
| 15 Jun, 2026 | Jonathan Zalevsky | Chief Rd Officer | Disposed S | 5,538 | $60.71 | $336.21K | 15,437 | Direct |
| 19 May, 2026 | Jonathan Zalevsky | Chief Rd Officer | Disposed S | 199 | $65.51 | $13.04K | 20,975 | Direct |
| 19 May, 2026 | Howard W Robin | President Ceo | Disposed S | 444 | $65.51 | $29.09K | 75,045 | Direct |
| 18 Feb, 2026 | Howard W Robin | President Ceo | Disposed S | 423 | $73.00 | $30.88K | 75,489 | Direct |
| 18 Feb, 2026 | Jonathan Zalevsky | Chief Rd Officer | Disposed S | 180 | $73.00 | $13.14K | 21,174 | Direct |
| 20 Jan, 2026 | Jonathan Zalevsky | Chief Rd Officer | Disposed S | 3,867 | $35.67 | $137.94K | 21,354 | Direct |
| 22 Dec, 2025 | Jonathan Zalevsky | Chief Rd Officer | Acquired A | 6,250 | $0.00 | $0 | 25,221 | Direct |
| 22 Dec, 2025 | Howard W Robin | President Ceo | Acquired A | 21,667 | $0.00 | $0 | 75,912 | Direct |
| 22 Dec, 2025 | Jonathan Zalevsky | Chief Rd Officer | Acquired A | 25,000 | $0.00 | $0 | 25,000 | Direct |
| 22 Dec, 2025 | Howard W Robin | President Ceo | Acquired A | 86,667 | $0.00 | $0 | 86,667 | Direct |
| 21 Nov, 2025 | Mark Andrew Wilson | Chief Legal Officer | Acquired A | 1,903 | $0.00 | $0 | 22,215 | Direct |