Rebecca B. Robertson is Director at TANDEM DIABETES CARE INC (TNDM). They have made 9 open-market trades across 2 companies since 2009, most recently 2026-06-02.
CIK 0001201585
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.
1 open-market purchase totalling $624K since 2009, against 8 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| CBLL | SELL · 10b5-1 | 2026-03-03 | 2026-03-05 | $17.80 | $15K | +9.6% | +2.1% | -3.8% |
| CBLL | SELL · 10b5-1 | 2026-01-02 | 2026-01-06 | $21.89 | $55K | +0.9% | -11.1% | -16.5% |
| CBLL | SELL · 10b5-1 | 2025-12-08 | 2025-12-10 | $20.00 | $100K | +3.9% | +14.9% | -9.2% |
| CBLL | SELL · 10b5-1 | 2025-12-02 | 2025-12-04 | $16.67 | $14K | +15.1% | +9.0% | -7.0% |
| CBLL | SELL · 10b5-1 | 2025-09-03 | 2025-09-05 | $11.36 | $9K | +0.6% | +5.8% | +61.2% |
| CBLL | SELL · 10b5-1 | 2025-06-17 | 2026-01-06 | $17.63 | $131K | +0.9% | -11.1% | -16.5% |
| CBLL | SELL · 10b5-1 | 2025-06-17 | 2025-06-20 | $17.80 | $531K | +4.0% | -15.1% | -29.9% |
| CBLL | SELL · 10b5-1 | 2025-06-16 | 2025-06-17 | $17.14 | $343K | +5.5% | -12.0% | -32.7% |
| TNDM | SELL | 2022-05-02 | 2022-05-04 | $96.73 | $290K | -20.1% | -29.6% | -24.4% |
| TNDM | SELL | 2022-02-01 | 2022-02-03 | $118.12 | $319K | +1.6% | -9.5% | -18.6% |
| TNDM | SELL | 2021-11-01 | 2021-11-03 | $135.71 | $369K | +7.8% | +4.6% | -5.8% |
| TNDM | SELL | 2021-08-02 | 2021-08-03 | $107.51 | $161K | +2.6% | +8.6% | +30.8% |
| TNDM | SELL · 10b5-1 | 2021-06-09 | 2021-06-10 | $90.00 | $45K | +4.5% | +5.3% | +40.1% |
| TNDM | SELL | 2021-06-01 | 2021-06-03 | $85.11 | $85K | +4.9% | +15.6% | +31.6% |
| TNDM | SELL | 2021-03-01 | 2021-03-03 | $96.14 | $144K | -2.2% | -3.3% | -5.5% |
| TNDM | SELL | 2020-12-01 | 2020-12-03 | $94.03 | $141K | -6.0% | -2.6% | -6.3% |
| TNDM | SELL | 2020-09-02 | 2020-09-04 | $114.12 | $1.9M | +2.1% | +8.7% | -8.2% |
| HLCS | BUY | 2009-09-18 | 2009-09-21 | $2.57 | $624K | N/A | N/A | N/A |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.