NKTRNEKTAR THERAPEUTICS
- Market cap
- $1.27B
- as of 2026-10-23
- Latest close
- $37.22
- as of 2026-10-23
- Sector
- Healthcare
- as of 2026-10-24
- Industry
- Biotechnology
- as of 2026-10-24
Cluster
No cluster in the last 90 days under the default rule (14d · ≥2 insiders · all roles).
Form 4 historysince 2023-11-20
| Insider | Traded | Filed | Type | Shares | Price | Value | Owned after | 10b5-1 plan | Filing |
|---|---|---|---|---|---|---|---|---|---|
| Ajer Jeffrey Robert | Sep 23 | Sep 25 | A | 2,000 | $0.00 | $0 | 4,277 | No | Form 4 |
| Ajer Jeffrey Robert | Sep 23 | Sep 25 | A · derivative | 4,000 | $57.66 | $230,640 | 4,000 | No | Form 4 |
| Brainard Diana | Sep 23 | Sep 25 | A | 2,000 | $0.00 | $0 | 3,904 | No | Form 4 |
| Brainard Diana | Sep 23 | Sep 25 | A · derivative | 4,000 | $57.66 | $230,640 | 4,000 | No | Form 4 |
| Chess Robert | Sep 23 | Sep 25 | A | 2,000 | $0.00 | $0 | 19,019 | No | Form 4 |
| Chess Robert | Sep 23 | Sep 25 | A · derivative | 4,000 | $57.66 | $230,640 | 4,000 | No | Form 4 |
| Greer R Scott | Sep 23 | Sep 25 | A | 2,000 | $0.00 | $0 | 22,239 | No | Form 4 |
| Greer R Scott | Sep 23 | Sep 25 | A · derivative | 4,000 | $57.66 | $230,640 | 4,000 | No | Form 4 |
| Whitfield Roy A | Sep 23 | Sep 25 | A | 2,000 | $0.00 | $0 | 16,417 | No | Form 4 |
| Whitfield Roy A | Sep 23 | Sep 25 | A · derivative | 4,000 | $57.66 | $230,640 | 4,000 | No | Form 4 |
| Robin Howard WPresident & CEO | Aug 18 | Aug 20 | S | 418 | $71.98 | Sale −$30,088 | 54,627 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Aug 18 | Aug 20 | S | 186 | $71.98 | Sale −$13,388 | 9,570 | No | Form 4 |
| Robin Howard WPresident & CEO | Jul 24 | Jul 24 | A · derivative | 57,200 | $15.15 | $866,580 | 57,200 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Jul 24 | Jul 24 | A · derivative | 16,500 | $15.15 | $249,975 | 16,500 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Jun 30 | Jul 2 | S | 5,681 | $70.00 | Sale −$397,670 | 9,756 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Jun 17 | Jun 18 | S | 5,500 | $60.81 | Sale −$334,455 | 59,545 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Jun 17 | Jun 18 | S | 4,500 | $61.65 | Sale −$277,425 | 55,045 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Jun 16 | Jun 18 | S | 5,303 | $59.97 | Sale −$318,021 | 69,742 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Jun 16 | Jun 18 | S | 4,697 | $60.71 | Sale −$285,155 | 65,045 | Yes | Form 4 |
| Zalevsky JonathanChief R&D Officer | Jun 15 | Jun 17 | S | 5,538 | $60.71 | Sale −$336,212 | 15,437 | Yes | Form 4 |
| Robin Howard WPresident & CEO | May 19 | May 21 | S | 444 | $65.51 | Sale −$29,086 | 75,045 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | May 19 | May 21 | S | 199 | $65.51 | Sale −$13,036 | 20,975 | No | Form 4 |
| Robin Howard WPresident & CEO | Feb 18 | Feb 20 | S | 423 | $73.00 | Sale −$30,879 | 75,489 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Feb 18 | Feb 20 | S | 180 | $73.00 | Sale −$13,140 | 21,174 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Jan 20 | Jan 22 | S | 3,867 | $35.67 | Sale −$137,936 | 21,354 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Dec 22, 2025 | Dec 23, 2025 | A | 21,667 | $0.00 | $0 | 75,912 | No | Form 4 |
| Robin Howard WPresident & CEO | Dec 22, 2025 | Dec 23, 2025 | A · derivative | 86,667 | $43.48 | $3,768,281 | 86,667 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Dec 22, 2025 | Dec 23, 2025 | A | 6,250 | $0.00 | $0 | 25,221 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Dec 22, 2025 | Dec 23, 2025 | A · derivative | 25,000 | $43.48 | $1,087,000 | 25,000 | No | Form 4 |
| Robin Howard WPresident & CEO | Nov 25, 2025 | Nov 25, 2025 | S | 2,207 | $54.28 | Sale −$119,796 | 54,245 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Nov 25, 2025 | Nov 25, 2025 | S | 630 | $54.28 | Sale −$34,196 | 21,585 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Nov 25, 2025 | Nov 25, 2025 | S | 1,157 | $54.28 | Sale −$62,802 | 18,971 | No | Form 4 |
| Robin Howard WPresident & CEO | Nov 21, 2025 | Nov 25, 2025 | A | 7,110 | $0.00 | $0 | 56,452 | No | Form 4 |
| Robin Howard WPresident & CEO | Nov 21, 2025 | Nov 25, 2025 | A · derivative | 12,170 | $281.25 | $3,422,813 | 12,170 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Nov 21, 2025 | Nov 25, 2025 | A | 1,903 | $0.00 | $0 | 22,215 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Nov 21, 2025 | Nov 25, 2025 | A · derivative | 3,400 | $281.25 | $956,250 | 3,400 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Nov 21, 2025 | Nov 25, 2025 | A | 2,666 | $0.00 | $0 | 20,128 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Nov 21, 2025 | Nov 25, 2025 | A · derivative | 4,766 | $281.25 | $1,340,438 | 4,766 | No | Form 4 |
| Ajer Jeffrey Robert | Sep 30, 2025 | Oct 1, 2025 | A · derivative | 8,000 | $56.90 | $455,200 | 8,000 | No | Form 4 |
| Brainard Diana | Sep 30, 2025 | Oct 1, 2025 | A · derivative | 8,000 | $56.90 | $455,200 | 8,000 | No | Form 4 |
| Chess Robert | Sep 30, 2025 | Oct 1, 2025 | A · derivative | 8,000 | $56.90 | $455,200 | 8,000 | No | Form 4 |
| Greer R Scott | Sep 30, 2025 | Oct 1, 2025 | A · derivative | 8,000 | $56.90 | $455,200 | 8,000 | No | Form 4 |
| Whitfield Roy A | Sep 30, 2025 | Oct 1, 2025 | A · derivative | 8,000 | $56.90 | $455,200 | 8,000 | No | Form 4 |
| Robin Howard WPresident & CEO | Sep 9, 2025 | Sep 11, 2025 | S | 2,100 | $45.16 | Sale −$94,836 | 53,908 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 9, 2025 | Sep 11, 2025 | S | 1,200 | $46.41 | Sale −$55,692 | 52,708 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 9, 2025 | Sep 11, 2025 | S | 2,156 | $47.49 | Sale −$102,388 | 50,552 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 9, 2025 | Sep 11, 2025 | S | 1,210 | $48.18 | Sale −$58,298 | 49,342 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 5, 2025 | Sep 8, 2025 | S | 3,304 | $37.87 | Sale −$125,122 | 59,370 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 5, 2025 | Sep 8, 2025 | S | 2,226 | $38.82 | Sale −$86,413 | 57,144 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 5, 2025 | Sep 8, 2025 | S | 1,136 | $39.89 | Sale −$45,315 | 56,008 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 4, 2025 | Sep 8, 2025 | S | 1,923 | $32.37 | Sale −$62,248 | 65,917 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 4, 2025 | Sep 8, 2025 | S | 1,496 | $33.54 | Sale −$50,176 | 64,421 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 4, 2025 | Sep 8, 2025 | S | 613 | $34.40 | Sale −$21,087 | 63,808 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 4, 2025 | Sep 8, 2025 | S | 1,134 | $35.80 | Sale −$40,597 | 62,674 | Yes | Form 4 |
| Zalevsky JonathanChief R&D Officer | Sep 4, 2025 | Sep 8, 2025 | S | 793 | $32.43 | Sale −$25,717 | 18,390 | Yes | Form 4 |
| Zalevsky JonathanChief R&D Officer | Sep 4, 2025 | Sep 8, 2025 | S | 432 | $33.60 | Sale −$14,515 | 17,958 | Yes | Form 4 |
| Zalevsky JonathanChief R&D Officer | Sep 4, 2025 | Sep 8, 2025 | S | 189 | $34.41 | Sale −$6,503 | 17,769 | Yes | Form 4 |
| Zalevsky JonathanChief R&D Officer | Sep 4, 2025 | Sep 8, 2025 | S | 307 | $35.69 | Sale −$10,957 | 17,462 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Sep 2, 2025 | Sep 4, 2025 | S | 1,500 | $30.16 | Sale −$45,240 | 67,840 | Yes | Form 4 |
| Zalevsky JonathanChief R&D Officer | Sep 2, 2025 | Sep 4, 2025 | S | 485 | $30.10 | Sale −$14,599 | 19,183 | Yes | Form 4 |
| Robin Howard WPresident & CEO | Aug 19, 2025 | Aug 21, 2025 | S | 1,573 | $26.59 | Sale −$41,826 | 69,340 | No | Form 4 |
| Robin Howard WPresident & CEO | Aug 19, 2025 | Aug 21, 2025 | A · derivative | 86,666 | $0.50 | $43,333 | 86,666 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Aug 19, 2025 | Aug 21, 2025 | S | 676 | $26.59 | Sale −$17,975 | 20,312 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Aug 19, 2025 | Aug 21, 2025 | A · derivative | 21,666 | $0.50 | $10,833 | 21,666 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Aug 19, 2025 | Aug 21, 2025 | S | 725 | $26.59 | Sale −$19,278 | 19,668 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Aug 19, 2025 | Aug 21, 2025 | A · derivative | 16,666 | $0.50 | $8,333 | 16,666 | No | Form 4 |
| Robin Howard WPresident & CEO | May 19, 2025 | May 21, 2025 | S | 23,208 | $0.67 | Sale −$15,549 | 1,063,693 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | May 19, 2025 | May 21, 2025 | S | 9,996 | $0.67 | Sale −$6,697 | 314,296 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | May 19, 2025 | May 21, 2025 | S | 10,712 | $0.67 | Sale −$7,177 | 305,892 | No | Form 4 |
| Robin Howard WPresident & CEO | Feb 19, 2025 | Feb 21, 2025 | S | 23,774 | $1.01 | Sale −$24,012 | 1,086,901 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Feb 19, 2025 | Feb 21, 2025 | S | 11,040 | $1.01 | Sale −$11,150 | 324,292 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Feb 19, 2025 | Feb 21, 2025 | S | 10,300 | $1.01 | Sale −$10,403 | 316,604 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Dec 24, 2024 | Dec 26, 2024 | S | 16,560 | $0.89 | Sale −$14,738 | 335,332 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Dec 23, 2024 | Dec 26, 2024 | S | 33,402 | $0.90 | Sale −$30,062 | 351,892 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Dec 19, 2024 | Dec 20, 2024 | S | 51,115 | $0.94 | Sale −$48,048 | 326,904 | No | Form 4 |
| Robin Howard WPresident & CEO | Dec 18, 2024 | Dec 19, 2024 | S | 85,035 | $0.99 | Sale −$84,185 | 1,110,675 | No | Form 4 |
| Robin Howard WPresident & CEO | Dec 17, 2024 | Dec 19, 2024 | S | 46,995 | $1.01 | Sale −$47,465 | 1,195,710 | No | Form 4 |
| Robin Howard WPresident & CEO | Dec 13, 2024 | Dec 17, 2024 | A | 410,625 | $0.00 | $0 | 1,242,705 | No | Form 4 |
| Robin Howard WPresident & CEO | Dec 13, 2024 | Dec 17, 2024 | A · derivative | 821,250 | $4.91 | $4,032,338 | 821,250 | No | Form 4 |
| Robin Howard WPresident & CEO | Dec 13, 2024 | Dec 17, 2024 | A · derivative | 1,300,000 | $1.01 | $1,313,000 | 1,300,000 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Dec 13, 2024 | Dec 17, 2024 | A | 165,938 | $0.00 | $0 | 385,294 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Dec 13, 2024 | Dec 17, 2024 | A · derivative | 331,875 | $4.91 | $1,629,506 | 331,875 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Dec 13, 2024 | Dec 17, 2024 | A · derivative | 325,000 | $1.01 | $328,250 | 325,000 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Dec 13, 2024 | Dec 17, 2024 | A | 135,000 | $0.00 | $0 | 378,019 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Dec 13, 2024 | Dec 17, 2024 | A · derivative | 270,000 | $4.91 | $1,325,700 | 270,000 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Dec 13, 2024 | Dec 17, 2024 | A · derivative | 375,000 | $1.01 | $378,750 | 375,000 | No | Form 4 |
| Robin Howard WPresident & CEO | Nov 19, 2024 | Nov 20, 2024 | S | 16,278 | $1.01 | Sale −$16,441 | 832,080 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Nov 19, 2024 | Nov 20, 2024 | S | 6,407 | $1.01 | Sale −$6,471 | 218,856 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Nov 19, 2024 | Nov 20, 2024 | S | 7,785 | $1.01 | Sale −$7,863 | 243,019 | No | Form 4 |
| Robin Howard WPresident & CEO | Aug 19, 2024 | Aug 20, 2024 | S | 14,881 | $1.28 | Sale −$19,048 | 848,358 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Aug 19, 2024 | Aug 20, 2024 | S | 5,651 | $1.28 | Sale −$7,233 | 225,263 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Aug 19, 2024 | Aug 20, 2024 | S | 6,866 | $1.28 | Sale −$8,788 | 250,804 | No | Form 4 |
| Chess Robert | Jun 14, 2024 | Jun 14, 2024 | S | 19,500 | $1.20 | Sale −$23,400 | 255,273 | Yes | Form 4 |
| Wilson Mark AndrewChief Legal Officer | May 17, 2024 | May 20, 2024 | S | 6,260 | $1.75 | Sale −$10,955 | 230,414 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | May 17, 2024 | May 20, 2024 | S | 7,355 | $1.75 | Sale −$12,871 | 257,670 | No | Form 4 |
| Robin Howard WPresident & CEO | May 17, 2024 | May 20, 2024 | S | 16,650 | $1.75 | Sale −$29,138 | 863,239 | No | Form 4 |
| Kroin David | May 10, 2024 | May 13, 2024 | S | 56,000 | $1.78 | Sale −$99,680 | 18,344,000 | No | Form 4 |
| Robin Howard WPresident & CEO | Feb 20, 2024 | Feb 22, 2024 | S | 20,033 | $0.68 | Sale −$13,622 | 879,889 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Feb 20, 2024 | Feb 22, 2024 | S | 7,606 | $0.68 | Sale −$5,172 | 236,674 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Feb 20, 2024 | Feb 22, 2024 | S | 9,014 | $0.68 | Sale −$6,130 | 265,025 | No | Form 4 |
| Robin Howard WPresident & CEO | Dec 13, 2023 | Dec 15, 2023 | A · derivative | 1,300,000 | $0.50 | $650,000 | 1,300,000 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Dec 13, 2023 | Dec 15, 2023 | A · derivative | 325,000 | $0.50 | $162,500 | 325,000 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Dec 13, 2023 | Dec 15, 2023 | A · derivative | 250,000 | $0.50 | $125,000 | 250,000 | No | Form 4 |
| Robin Howard WPresident & CEO | Nov 17, 2023 | Nov 20, 2023 | S | 19,877 | $0.49 | Sale −$9,740 | 899,922 | No | Form 4 |
| Wilson Mark AndrewChief Legal Officer | Nov 17, 2023 | Nov 20, 2023 | S | 7,179 | $0.49 | Sale −$3,518 | 243,780 | No | Form 4 |
| Zalevsky JonathanChief R&D Officer | Nov 17, 2023 | Nov 20, 2023 | S | 9,646 | $0.49 | Sale −$4,727 | 274,039 | No | Form 4 |