Robert Chess is Director at NEKTAR THERAPEUTICS (NKTR). They have made 36 open-market trades across 2 companies since 2006, most recently 2026-09-23.
CIK 0001227886
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 36 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| TWST | 21,084 | $2.8M |
| NKTR | 19,019 | $681K |
| Total | $3.5M |
Shares reported on the most recent Form 4, priced at the 2026-09-25 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| TWST | SELL · 10b5-1 | 2026-08-07 | 2026-08-11 | $110.89 | $2.0M | +18.5% | +3.3% | — |
| TWST | SELL · 10b5-1 | 2026-03-17 | 2026-03-19 | $47.00 | $470K | +6.5% | +38.7% | +85.9% |
| TWST | SELL | 2026-02-13 | 2026-02-18 | $48.26 | $105K | -15.2% | -22.3% | -8.5% |
| TWST | SELL | 2025-02-07 | 2025-02-11 | $53.14 | $312K | -9.1% | -13.7% | -27.3% |
| TWST | SELL · 10b5-1 | 2025-01-07 | 2025-01-10 | $50.00 | $250K | +25.9% | +14.8% | -13.5% |
| TWST | SELL · 10b5-1 | 2024-12-05 | 2024-12-30 | $51.78 | $326K | -7.9% | +4.6% | -17.1% |
| TWST | SELL · 10b5-1 | 2024-11-11 | 2024-11-13 | $47.26 | $340K | +9.0% | +11.6% | +8.5% |
| NKTR | SELL · 10b5-1 | 2024-06-14 | 2024-06-14 | $1.20 | $23K | -3.4% | +18.6% | +5.9% |
| TWST | SELL | 2024-02-08 | 2024-02-09 | $34.98 | $288K | +1.8% | -2.9% | +13.8% |
| NKTR | SELL · 10b5-1 | 2022-09-22 | 2023-09-20 | $0.67 | $7K | -20.1% | -27.6% | -32.1% |
| NKTR | SELL · 10b5-1 | 2022-09-22 | 2022-09-26 | $3.19 | $16K | +9.0% | +21.3% | -34.5% |
| TWST | SELL | 2022-02-04 | 2022-02-08 | $58.88 | $15K | -14.5% | -20.7% | -54.5% |
| TWST | SELL | 2021-11-01 | 2021-11-03 | $120.15 | $481K | -17.7% | -39.9% | -53.8% |
| TWST | SELL | 2021-10-21 | 2021-10-25 | $120.15 | $445K | +14.4% | -19.1% | -52.8% |
| TWST | SELL · 10b5-1 | 2021-10-19 | 2021-10-21 | $120.00 | $36K | +8.2% | -17.6% | -53.7% |
| NKTR | SELL | 2021-09-22 | 2021-09-24 | $17.94 | $83K | -13.1% | -13.1% | -15.5% |
| TWST | SELL | 2021-09-10 | 2021-09-14 | $120.23 | $481K | -0.4% | +1.8% | -24.0% |
| NKTR | SELL | 2021-09-08 | 2021-09-10 | $16.01 | $457K | +11.1% | +7.6% | -22.3% |
| NKTR | SELL | 2021-07-20 | 2021-07-22 | $16.81 | $155K | -3.5% | -14.2% | -0.8% |
| TWST | SELL | 2021-07-12 | 2021-07-14 | $125.62 | $893K | +3.0% | -10.0% | -7.0% |
| TWST | SELL | 2021-06-23 | 2021-06-25 | $120.10 | $480K | +1.1% | -8.1% | -3.2% |
| NKTR | SELL | 2021-05-12 | 2021-05-14 | $19.34 | $155K | -4.0% | -5.9% | -23.9% |
| NKTR | SELL | 2021-04-14 | 2021-04-16 | $18.98 | $152K | +6.9% | -4.0% | -12.4% |
| TWST | SELL | 2021-02-05 | 2021-02-09 | $159.54 | $225K | -23.3% | -18.8% | -46.2% |
| NKTR | SELL | 2020-09-25 | 2020-09-25 | $17.75 | $98K | +1.0% | -3.9% | +4.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.