Stephen K Doberstein
CIK 1480111 · View on SEC EDGAR ↗
Insider
First SEC filing: Jan. 6, 2010 · Latest: Jan. 6, 2010
On this page
- Insider at Companies where this person is a reporting insider.
- Insider transactions Every share this person bought or sold, from Form 4 filings.
- Derivatives Options and other derivative holdings reported by this person.
- Initial holdings The stakes this person held when they first started reporting.
- Compensation Executive pay disclosed in company proxy statements.
Insider at
Insider transactions
0 buys (P)
0 sells (S)
Net:
$0
+ 55 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
55 other filings hidden
| Date | Ticker | Code | Shares | Price | Value | Owned after | Δ own | A/D | vs now |
|---|---|---|---|---|---|---|---|---|---|
| Sept. 5, 2019 | NKTR | P | 15,000 | $17.28 | $259,200 | 107,668 Direct | +16.19% | Acquired | -71.1% (price as of 2026-08-20) |
| Aug. 16, 2019 | NKTR | S | 3,245 | $18.15 | $58,897 | 92,668 Direct | -3.38% | Disposed | -72.5% (price as of 2026-08-20) |
| May 16, 2019 | NKTR | S | 3,461 | $31.37 | $108,572 | 95,913 Direct | -3.48% | Disposed | -84.1% (price as of 2026-08-20) |
| Feb. 19, 2019 | NKTR | S | 3,310 | $42.39 | $140,311 | 99,374 Direct | -3.22% | Disposed | -88.2% (price as of 2026-08-20) |
| Nov. 16, 2018 | NKTR | S | 4,524 | $38.25 | $173,043 | 78,734 Direct | -5.43% | Disposed | -87.0% (price as of 2026-08-20) |
| May 16, 2018 | NKTR | S | 3,435 | $83.39 | $286,445 | 63,959 Direct | -5.10% | Disposed | -94.0% (price as of 2026-08-20) |
| April 9, 2018 | NKTR | S 10b5-1 | 49,500 | $96.13 | $4,758,435 | 67,394 Direct | -42.35% | Disposed | -94.8% (price as of 2026-08-20) |
| April 6, 2018 | NKTR | S 10b5-1 | 110,500 | $91.69 | $10,131,745 | 67,394 Direct | -62.12% | Disposed | -94.6% (price as of 2026-08-20) |
| Feb. 16, 2018 | NKTR | S | 2,426 | $82.94 | $201,212 | 67,394 Direct | -3.47% | Disposed | -94.0% (price as of 2026-08-20) |
| Nov. 8, 2017 | NKTR | S 10b5-1 | 300,000 | $30.09 | $9,027,000 | 31,102 Direct | -90.61% | Disposed | -83.4% (price as of 2026-08-20) |
| Nov. 7, 2017 | NKTR | S 10b5-1 | 75,409 | $25.78 | $1,944,044 | 31,102 Direct | -70.80% | Disposed | -80.7% (price as of 2026-08-20) |
| Nov. 6, 2017 | NKTR | S 10b5-1 | 20,914 | $24.98 | $522,432 | 31,102 Direct | -40.21% | Disposed | -80.0% (price as of 2026-08-20) |
| Oct. 5, 2017 | NKTR | S 10b5-1 | 43,677 | $24.97 | $1,090,615 | 31,102 Direct | -58.41% | Disposed | -80.0% (price as of 2026-08-20) |
| Aug. 16, 2017 | NKTR | S | 1,701 | $19.32 | $32,863 | 31,102 Direct | -5.19% | Disposed | -74.2% (price as of 2026-08-20) |
| May 16, 2017 | NKTR | S | 1,701 | $19.55 | $33,255 | 32,803 Direct | -4.93% | Disposed | -74.5% (price as of 2026-08-20) |
| April 5, 2017 | NKTR | S 10b5-1 | 100,000 | $21.70 | $2,170,000 | 34,504 Direct | -74.35% | Disposed | -77.0% (price as of 2026-08-20) |
| Feb. 16, 2017 | NKTR | S | 1,261 | $13.14 | $16,570 | 34,504 Direct | -3.53% | Disposed | -62.0% (price as of 2026-08-20) |
| Nov. 16, 2016 | NKTR | S | 670 | $13.96 | $9,353 | 18,265 Direct | -3.54% | Disposed | -64.3% (price as of 2026-08-20) |
| Aug. 16, 2016 | NKTR | S | 1,336 | $17.56 | $23,460 | 18,935 Direct | -6.59% | Disposed | -71.6% (price as of 2026-08-20) |
| May 17, 2016 | NKTR | S | 339 | $13.58 | $4,604 | 1,021 Direct | -24.93% | Disposed | -63.3% (price as of 2026-08-20) |
| Feb. 17, 2016 | NKTR | S | 390 | $11.92 | $4,649 | 485 Direct | -44.57% | Disposed | -58.2% (price as of 2026-08-20) |
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 |
|---|---|---|---|---|---|---|---|
| May 29, 2026 | FBRX | Restricted Stock Units | Common Stock (18,353) | — | — | 18,353 | Acquired |
| Sept. 19, 2023 | FBRX | Stock Option (right to buy) | Common Stock (25,000) | $0.80 | Sept. 19, 2033 | 25,000 | Acquired |
| June 1, 2022 | FBRX | Stock Option (right to buy) | Common Stock (25,000) | $1.27 | June 1, 2032 | 25,000 | Acquired |
| May 12, 2022 | FBRX | Stock Option (right to buy) | Common Stock (50,000) | $1.18 | May 12, 2032 | 50,000 | Acquired |
| Dec. 14, 2018 | NKTR | Stock Option | Common Stock (48,400) | $36.51 | Dec. 13, 2026 | 48,400 | Acquired |
| Aug. 15, 2018 | NKTR | Stock Option [F4] | Common Stock (65,000) | $56.90 | Dec. 14, 2025 | 65,000 | Acquired |
| April 9, 2018 | NKTR | Stock Option [F1] | Common Stock (49,500) | $7.21 | Feb. 7, 2020 | 49,500 | Disposed |
| April 6, 2018 | NKTR | Stock Option [F1] | Common Stock (500) | $7.21 | Feb. 7, 2020 | 500 | Disposed |
| April 6, 2018 | NKTR | Stock Option [F1] | Common Stock (50,000) | $7.21 | Feb. 7, 2020 | 50,000 | Disposed |
| April 6, 2018 | NKTR | Stock Option [F1] | Common Stock (60,000) | $10.69 | Feb. 7, 2019 | 60,000 | Disposed |
| Dec. 15, 2017 | NKTR | Stock Option | Common Stock (65,000) | $56.90 | Dec. 14, 2025 | 65,000 | Acquired |
| Nov. 15, 2017 | NKTR | Stock Option [F5] | Common Stock (43,750) | $14.41 | Dec. 12, 2024 | 43,750 | Acquired |
| Nov. 8, 2017 | NKTR | Stock Option [F1] | Common Stock (300,000) | $9.53 | Jan. 5, 2018 | 300,000 | Disposed |
| Nov. 7, 2017 | NKTR | Stock Option [F1] | Common Stock (75,409) | $9.53 | Jan. 5, 2018 | 75,409 | Disposed |
| Nov. 6, 2017 | NKTR | Stock Option [F1] | Common Stock (20,914) | $9.53 | Jan. 5, 2018 | 20,914 | Disposed |
| Oct. 5, 2017 | NKTR | Stock Option [F1] | Common Stock (43,677) | $9.53 | Jan. 5, 2018 | 43,677 | Disposed |
| April 5, 2017 | NKTR | Stock Option [F1] | Common Stock (100,000) | $9.53 | Jan. 5, 2018 | 100,000 | Disposed |
| Dec. 13, 2016 | NKTR | Stock Option | Common Stock (43,750) | $12.24 | Dec. 12, 2024 | 43,750 | Acquired |
| July 14, 2016 | NKTR | Stock Option [F6] | Common Stock (8,750) | $15.55 | Dec. 14, 2023 | 8,750 | Acquired |
| July 14, 2016 | NKTR | Stock Option [F3] | Common Stock (50,000) | $16.31 | Dec. 8, 2022 | 50,000 | Acquired |
| May 16, 2016 | NKTR | Restricted Stock Unit | Common Stock (875) | $0.00 | May 16, 2016 | 875 | Disposed |
| Feb. 16, 2016 | NKTR | Restricted Stock Unit | Common Stock (875) | $0.00 | Feb. 16, 2016 | 875 | Disposed |
| Dec. 15, 2015 | NKTR | Stock Option | Common Stock (8,750) | $15.55 | Dec. 14, 2023 | 8,750 | Acquired |
| Dec. 15, 2015 | NKTR | Restricted Stock Unit | Common Stock (10,500) | — | Dec. 14, 2023 | 10,500 | Acquired |
| Dec. 15, 2015 | NKTR | Stock Option | Common Stock (10,500) | $15.55 | Dec. 14, 2023 | 10,500 | Acquired |
| Dec. 15, 2015 | NKTR | Restricted Stock Unit | Common Stock (8,750) | — | Dec. 14, 2023 | 8,750 | Acquired |
| Dec. 9, 2014 | NKTR | Stock Option | Common Stock (50,000) | $16.31 | Dec. 8, 2022 | 50,000 | Acquired |
| Dec. 9, 2014 | NKTR | Stock Option | Common Stock (50,000) | $16.31 | Dec. 8, 2022 | 50,000 | Acquired |
| Feb. 5, 2014 | NKTR | Stock Option | Common Stock (50,000) | $12.43 | Feb. 4, 2022 | 50,000 | Acquired |
| Feb. 5, 2014 | NKTR | Stock Option | Common Stock (50,000) | $12.43 | Feb. 4, 2022 | 50,000 | Acquired |
| Feb. 6, 2013 | NKTR | Stock Option | Common Stock (50,000) | $8.80 | Feb. 5, 2021 | 50,000 | Acquired |
| Feb. 6, 2013 | NKTR | Stock Option | Common Stock (50,000) | $8.80 | Feb. 5, 2021 | 50,000 | Acquired |
| Feb. 8, 2012 | NKTR | Stock Option | Common Stock (50,000) | $7.21 | Feb. 7, 2020 | 50,000 | Acquired |
| Feb. 8, 2012 | NKTR | Stock Option | Common Stock (50,000) | $7.21 | Feb. 7, 2020 | 50,000 | Acquired |
| Feb. 8, 2011 | NKTR | Stock Option | Common Stock (60,000) | $10.69 | Feb. 8, 2019 | 60,000 | Acquired |
| Jan. 6, 2010 | NKTR | Stock Option | Common Stock (540,000) | $9.53 | Jan. 6, 2018 | 540,000 | Acquired |
Exercise/conversion price is blank when not applicable (e.g. RSUs).
Initial ownership (Form 3) 1 holding
Securities held when first becoming an insider, per SEC Form 3.
| Date | Ticker | Security | Shares | Ownership |
|---|---|---|---|---|
| Jan. 6, 2010 | NKTR | Stock Option→ Common Stock (540,000) | 540,000 | 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 |
|---|---|---|---|---|---|---|---|---|
| 2014 | $477,583 | — | — | — | $311,350 | — | $11,804 | $2,139,128 |
| 2013 | $459,722 | — | — | — | $231,000 | — | $9,513 | $1,159,605 |
Figures from the Summary Compensation Table of the company's proxy statement (DEF 14A). Compensation is not a recommendation.