Jonathan Zalevsky
Insider
First SEC filing: Oct. 1, 2019 · Latest: June 17, 2026
Insider at
Insider transactions
0 buys (P)
7 sells (S)
Net: $-974,184
Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Aug. 18, 2026 | NKTR | S | 186 | $71.98 | $13,388 | 9,570 Direct | -1.91% | Disposed | -41.3% (price as of 2026-10-05) |
| July 24, 2026 | NKTR | A | 16,500 | · | · | 16,500 Direct | · | Acquired | (price as of 2026-10-05) |
| June 30, 2026 | NKTR | S 10b5-1 | 5,681 | $70.00 | $397,670 | 9,756 Direct | -36.80% | Disposed | -39.7% (price as of 2026-10-05) |
| June 15, 2026 | NKTR | S 10b5-1 | 5,538 | $60.71 | $336,212 | 15,437 Direct | -26.40% | Disposed | -30.5% (price as of 2026-10-05) |
| May 19, 2026 | NKTR | S | 199 | $65.51 | $13,036 | 20,975 Direct | -0.94% | Disposed | -35.6% (price as of 2026-10-05) |
| Feb. 18, 2026 | NKTR | S | 180 | $73.00 | $13,140 | 21,174 Direct | -0.84% | Disposed | -42.2% (price as of 2026-10-05) |
| Jan. 20, 2026 | NKTR | S 10b5-1 | 3,867 | $35.67 | $137,936 | 21,354 Direct | -15.33% | Disposed | 18.4% (price as of 2026-10-05) |
| Dec. 22, 2025 | NKTR | A | 25,000 | · | · | 25,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 22, 2025 | NKTR | A | 6,250 | · | · | 25,221 Direct | +32.95% | Acquired | (price as of 2026-10-05) |
| Nov. 25, 2025 | NKTR | S | 1,157 | $54.28 | $62,802 | 18,971 Direct | -5.75% | Disposed | -22.2% (price as of 2026-10-05) |
| Nov. 21, 2025 | NKTR | A | 4,766 | · | · | 4,766 Direct | · | Acquired | (price as of 2026-10-05) |
| Nov. 21, 2025 | NKTR | A | 2,666 | · | · | 20,128 Direct | +15.27% | Acquired | (price as of 2026-10-05) |
| Sept. 4, 2025 | NKTR | S 10b5-1 | 307 | $35.69 | $10,957 | 17,462 Direct | -1.73% | Disposed | 18.3% (price as of 2026-10-05) |
| Sept. 4, 2025 | NKTR | S 10b5-1 | 189 | $34.41 | $6,503 | 17,769 Direct | -1.05% | Disposed | 22.7% (price as of 2026-10-05) |
| Sept. 4, 2025 | NKTR | S 10b5-1 | 432 | $33.60 | $14,515 | 17,958 Direct | -2.35% | Disposed | 25.7% (price as of 2026-10-05) |
| Sept. 4, 2025 | NKTR | S 10b5-1 | 793 | $32.43 | $25,717 | 18,390 Direct | -4.13% | Disposed | 30.2% (price as of 2026-10-05) |
| Sept. 2, 2025 | NKTR | S 10b5-1 | 485 | $30.10 | $14,598 | 19,183 Direct | -2.47% | Disposed | 40.3% (price as of 2026-10-05) |
| Aug. 19, 2025 | NKTR | A | 16,666 | · | · | 16,666 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 19, 2025 | NKTR | S | 725 | $26.59 | $19,278 | 19,668 Direct | -3.56% | Disposed | 58.8% (price as of 2026-10-05) |
| May 19, 2025 | NKTR | S | 10,712 | $0.67 | $7,177 | 305,892 Direct | -3.38% | Disposed | 320.1% (price as of 2026-10-05) |
| Feb. 19, 2025 | NKTR | S | 10,300 | $1.01 | $10,403 | 316,604 Direct | -3.15% | Disposed | 178.7% (price as of 2026-10-05) |
| Dec. 19, 2024 | NKTR | S | 51,115 | $0.94 | $48,048 | 326,904 Direct | -13.52% | Disposed | 199.4% (price as of 2026-10-05) |
| Dec. 13, 2024 | NKTR | A | 375,000 | · | · | 375,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 13, 2024 | NKTR | A | 270,000 | · | · | 270,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 13, 2024 | NKTR | A | 135,000 | · | · | 378,019 Direct | +55.55% | Acquired | (price as of 2026-10-05) |
| Nov. 19, 2024 | NKTR | S | 7,785 | $1.01 | $7,863 | 243,019 Direct | -3.10% | Disposed | 178.7% (price as of 2026-10-05) |
| Aug. 19, 2024 | NKTR | S | 6,866 | $1.28 | $8,788 | 250,804 Direct | -2.66% | Disposed | 119.9% (price as of 2026-10-05) |
| May 17, 2024 | NKTR | S | 7,355 | $1.75 | $12,871 | 257,670 Direct | -2.78% | Disposed | 60.8% (price as of 2026-10-05) |
| Feb. 20, 2024 | NKTR | S | 9,014 | $0.68 | $6,130 | 265,025 Direct | -3.29% | Disposed | 313.9% (price as of 2026-10-05) |
| Dec. 13, 2023 | NKTR | A | 250,000 | · | · | 250,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Nov. 17, 2023 | NKTR | S | 9,646 | $0.49 | $4,727 | 274,039 Direct | -3.40% | Disposed | 474.4% (price as of 2026-10-05) |
| Aug. 16, 2023 | NKTR | S | 9,703 | $0.78 | $7,568 | 283,685 Direct | -3.31% | Disposed | 260.9% (price as of 2026-10-05) |
| May 16, 2023 | NKTR | S | 9,791 | $0.72 | $7,050 | 293,388 Direct | -3.23% | Disposed | 290.9% (price as of 2026-10-05) |
| Feb. 16, 2023 | NKTR | S | 10,484 | $3.00 | $31,452 | 303,179 Direct | -3.34% | Disposed | -6.2% (price as of 2026-10-05) |
| Nov. 16, 2022 | NKTR | S | 13,460 | $3.57 | $48,052 | 313,663 Direct | -4.11% | Disposed | -21.2% (price as of 2026-10-05) |
| Aug. 18, 2022 | NKTR | S 10b5-1 | 73,716 | $4.65 | $342,779 | 327,123 Direct | -18.39% | Disposed | -39.5% (price as of 2026-10-05) |
| Aug. 16, 2022 | NKTR | S | 10,560 | $4.76 | $50,266 | 400,839 Direct | -2.57% | Disposed | -40.9% (price as of 2026-10-05) |
| Aug. 15, 2022 | NKTR | A | 270,000 | · | · | 270,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 15, 2022 | NKTR | A | 135,000 | · | · | 411,399 Direct | +48.84% | Acquired | (price as of 2026-10-05) |
| May 16, 2022 | NKTR | S | 21,673 | $3.95 | $85,608 | 276,399 Direct | -7.27% | Disposed | -28.7% (price as of 2026-10-05) |
| May 15, 2022 | NKTR | A | 23,950 | · | · | 298,072 Direct | +8.74% | Acquired | (price as of 2026-10-05) |
| Feb. 16, 2022 | NKTR | S | 10,912 | $10.95 | $119,486 | 274,122 Direct | -3.83% | Disposed | -74.3% (price as of 2026-10-05) |
| Dec. 16, 2021 | NKTR | A | 94,000 | · | · | 94,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 16, 2021 | NKTR | A | 52,950 | · | · | 285,034 Direct | +22.82% | Acquired | (price as of 2026-10-05) |
| Nov. 16, 2021 | NKTR | S | 20,869 | $13.16 | $274,636 | 232,084 Direct | -8.25% | Disposed | -78.6% (price as of 2026-10-05) |
| Nov. 15, 2021 | NKTR | A | 40,150 | · | · | 252,953 Direct | +18.87% | Acquired | (price as of 2026-10-05) |
| Oct. 12, 2021 | NKTR | A | 71,550 | · | · | 71,550 Direct | · | Acquired | (price as of 2026-10-05) |
| Aug. 16, 2021 | NKTR | S | 7,662 | $13.83 | $105,965 | 212,803 Direct | -3.48% | Disposed | -79.6% (price as of 2026-10-05) |
| May 17, 2021 | NKTR | S | 31,111 | $18.30 | $569,331 | 235,065 Direct | -11.69% | Disposed | -84.6% (price as of 2026-10-05) |
| Feb. 16, 2021 | NKTR | S | 24,141 | $22.37 | $540,034 | 266,176 Direct | -8.32% | Disposed | -87.4% (price as of 2026-10-05) |
| Dec. 18, 2020 | NKTR | A | 71,500 | · | · | 71,500 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 18, 2020 | NKTR | A | 40,000 | · | · | 290,317 Direct | +15.98% | Acquired | (price as of 2026-10-05) |
| Nov. 23, 2020 | NKTR | S 10b5-1 | 16,380 | $16.40 | $268,632 | 250,317 Direct | -6.14% | Disposed | -82.8% (price as of 2026-10-05) |
| Nov. 16, 2020 | NKTR | S | 29,618 | $16.93 | $501,433 | 266,697 Direct | -10.00% | Disposed | -83.4% (price as of 2026-10-05) |
| Aug. 17, 2020 | NKTR | S | 26,200 | $19.67 | $515,354 | 296,315 Direct | -8.12% | Disposed | -85.7% (price as of 2026-10-05) |
| May 18, 2020 | NKTR | S | 4,558 | $22.51 | $102,601 | 322,515 Direct | -1.39% | Disposed | -87.5% (price as of 2026-10-05) |
| Feb. 18, 2020 | NKTR | S | 4,774 | $22.35 | $106,699 | 327,073 Direct | -1.44% | Disposed | -87.4% (price as of 2026-10-05) |
| Dec. 12, 2019 | NKTR | A | 20,100 | · | · | 20,100 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 12, 2019 | NKTR | A | 71,550 | · | · | 71,550 Direct | · | Acquired | (price as of 2026-10-05) |
| Dec. 12, 2019 | NKTR | A | 40,150 | · | · | 331,847 Direct | +13.76% | Acquired | (price as of 2026-10-05) |
| Nov. 18, 2019 | NKTR | S | 3,960 | $17.97 | $71,161 | 291,697 Direct | -1.34% | Disposed | -84.3% (price as of 2026-10-05) |
| Oct. 1, 2019 | NKTR | A | 150,000 | · | · | 150,000 Direct | · | Acquired | (price as of 2026-10-05) |
| Oct. 1, 2019 | NKTR | A | 75,000 | · | · | 295,657 Direct | +33.99% | Acquired | (price as of 2026-10-05) |
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 |
|---|---|---|---|---|---|---|---|
| July 24, 2026 | NKTR | Stock Option [F1] | Common Stock | $15.15 | Dec. 12, 2032 | 16,500 | Acquired |
| Dec. 22, 2025 | NKTR | Stock Option | Common Stock | $43.48 | Dec. 21, 2033 | 25,000 | Acquired |
| Nov. 21, 2025 | NKTR | Stock Option [F5] | Common Stock | $281.25 | Dec. 17, 2028 | 4,766 | Acquired |
| Aug. 19, 2025 | NKTR | Stock Option [F4] | Common Stock | $0.50 | Dec. 12, 2031 | 16,666 | Acquired |
| Dec. 13, 2024 | NKTR | Stock Option | Common Stock | $1.01 | Dec. 12, 2032 | 375,000 | Acquired |
| Dec. 13, 2024 | NKTR | Stock Option [F3] | Common Stock | $4.91 | Aug. 14, 2030 | 270,000 | Acquired |
| Dec. 13, 2023 | NKTR | Stock Option | Common Stock | $0.50 | Dec. 12, 2031 | 250,000 | Acquired |
| Aug. 15, 2022 | NKTR | Common Stock [F4] | Common Stock | $4.91 | Aug. 14, 2030 | 270,000 | Acquired |
| Dec. 16, 2021 | NKTR | Stock Option | Common Stock | $13.22 | Dec. 15, 2029 | 94,000 | Acquired |
| Oct. 12, 2021 | NKTR | Stock Option [F1] | Common Stock | $21.79 | Dec. 11, 2027 | 71,550 | Acquired |
| Dec. 18, 2020 | NKTR | Stock Option | Common Stock | $18.75 | Dec. 17, 2028 | 71,500 | Acquired |
| Dec. 12, 2019 | NKTR | Stock Option | Common Stock | $21.79 | Dec. 11, 2017 | 20,100 | Acquired |
| Dec. 12, 2019 | NKTR | Stock Option | Common Stock | $21.79 | Dec. 11, 2027 | 71,550 | Acquired |
| Oct. 1, 2019 | NKTR | Stock Option | Common Stock | $18.43 | Sept. 30, 2027 | 150,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 12 holdings
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Oct. 1, 2019 | NKTR | Common Stock | 220,657 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 21,875 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 29,688 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 37,500 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 46,875 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 15,500 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 21,250 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 36,459 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 77,084 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 87,500 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 37,625 | Direct |
| Oct. 1, 2019 | NKTR | Stock Option | 48,400 | Direct |
Compensation (DEF 14A)
Matched by name from proxy statements (DEF 14A) — verify against the filing.
| Fiscal year | Salary | Bonus | Stock awards | Option awards | Non-equity incentive | Pension change | Other | Total |
|---|---|---|---|---|---|---|---|---|
| 2025 | $717,560 | · | $271,750 | $861,497 | $452,000 | · | $17,551 | $2,320,358 |
| 2024 | $703,490 | · | · | · | $431,885 | · | $15,825 | · |
| 2023 | $703,490 | · | · | $178,300 | $400,989 | · | $490,585 | $1,773,364 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.