According to recent filings covering the 90 days ending December 12, 2025, the three most significant insider holders at Nektar Therapeutics are President & CEO Howard W Robin (54.24K shares), Chief Legal Officer Mark Andrew Wilson (21.59K shares), Chief R&D Officer Jonathan Zalevsky (18.97K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Track Capital, Lp Deep | 1,222,994 | 13 May, 2024 | |
| Jillian B. Thomsen | Chief Financial Officer | 20,901 | 17 Feb, 2023 |
| Gil M Labrucherie | SVP And COO & Cfo | 20,861 | 17 May, 2022 |
| R Scott Greer | 20,239 | 20 Sep, 2022 | |
| Robert Chess | 17,159 | 14 Jun, 2024 | |
| John Northcott | SVP & Chief Commercial Officer | 14,881 | 17 May, 2022 |
| Roy A Whitfield | 14,417 | 15 Jun, 2023 | |
| Howard W Robin | President & CEO | 54,245 | 25 Nov, 2025 |
| Jeffrey Robert Ajer | 2,277 | 20 Sep, 2023 | |
| Diana Brainard | 1,904 | 20 Sep, 2022 | |
| Myriam Curet | 1,828 | 20 Sep, 2023 | |
| Karin Eastham | 1,549 | 20 Sep, 2022 | |
| Mark Andrew Wilson | Chief Legal Officer | 21,585 | 25 Nov, 2025 |
| Jonathan Zalevsky | Chief R&D Officer | 18,971 | 25 Nov, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 21 Nov, 2025 | Howard W Robin | Common Stock | A | 7,110 | $0.00 | 56,452 | D | A |
| 21 Nov, 2025 | Mark Andrew Wilson | Common Stock | A | 1,903 | $0.00 | 22,215 | D | A |
| 21 Nov, 2025 | Jonathan Zalevsky | Common Stock | A | 2,666 | $0.00 | 20,128 | D | A |
| 25 Nov, 2025 | Mark Andrew Wilson | Common Stock | D | 630 | $54.28 | 21,585 | D | S |
| 25 Nov, 2025 | Jonathan Zalevsky | Common Stock | D | 1,157 | $54.28 | 18,971 | D | S |
| 25 Nov, 2025 | Howard W Robin | Common Stock | D | 2,207 | $54.28 | 54,245 | D | S |
| 09 Sep, 2025 | Howard W Robin | Common Stock | D | 2,100 | $45.16 | 53,908 | D | S |
| 09 Sep, 2025 | Howard W Robin | Common Stock | D | 1,200 | $46.41 | 52,708 | D | S |
| 09 Sep, 2025 | Howard W Robin | Common Stock | D | 2,156 | $47.49 | 50,552 | D | S |
| 09 Sep, 2025 | Howard W Robin | Common Stock | D | 1,210 | $48.18 | 49,342 | D | S |
| 04 Sep, 2025 | Howard W Robin | Common Stock | D | 1,923 | $32.37 | 65,917 | D | S |
| 04 Sep, 2025 | Jonathan Zalevsky | Common Stock | D | 793 | $32.43 | 18,390 | D | S |
| 04 Sep, 2025 | Howard W Robin | Common Stock | D | 1,496 | $33.54 | 64,421 | D | S |
| 04 Sep, 2025 | Jonathan Zalevsky | Common Stock | D | 432 | $33.60 | 17,958 | D | S |
| 04 Sep, 2025 | Jonathan Zalevsky | Common Stock | D | 189 | $34.41 | 17,769 | D | S |
| 04 Sep, 2025 | Howard W Robin | Common Stock | D | 613 | $34.40 | 63,808 | D | S |
| 04 Sep, 2025 | Jonathan Zalevsky | Common Stock | D | 307 | $35.69 | 17,462 | D | S |
| 04 Sep, 2025 | Howard W Robin | Common Stock | D | 1,134 | $35.80 | 62,674 | D | S |
| 05 Sep, 2025 | Howard W Robin | Common Stock | D | 3,304 | $37.87 | 59,370 | D | S |
| 05 Sep, 2025 | Howard W Robin | Common Stock | D | 2,226 | $38.82 | 57,144 | D | S |