David B. Berger is CLO & VP at TANDEM DIABETES CARE INC (TNDM). They have made 37 open-market trades across 2 companies since 2010, most recently 2023-11-27.
CIK 0001422126
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 $30K since 2013, against 36 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| TNDM | SELL | 2023-03-03 | 2023-03-07 | $41.19 | $412K | -1.7% | -1.0% | -42.1% |
| TNDM | SELL | 2022-12-15 | 2022-12-19 | $40.29 | $1.0M | +11.6% | +2.9% | +3.4% |
| TNDM | SELL | 2022-06-08 | 2022-06-10 | $65.02 | $657K | +3.5% | -0.1% | -7.3% |
| TNDM | SELL | 2022-04-01 | 2022-04-05 | $117.88 | $118K | -5.3% | -32.6% | -46.9% |
| TNDM | SELL | 2022-03-16 | 2022-03-21 | $108.37 | $542K | +3.6% | +3.9% | -48.8% |
| TNDM | SELL | 2022-03-01 | 2022-03-02 | $112.68 | $113K | -12.8% | +3.6% | -41.7% |
| TNDM | SELL · 10b5-1 | 2022-02-01 | 2022-02-03 | $117.91 | $118K | +1.6% | -9.5% | -18.6% |
| TNDM | SELL | 2022-01-03 | 2022-01-05 | $149.05 | $273K | -15.1% | -14.5% | -11.9% |
| TNDM | SELL | 2021-12-15 | 2021-12-17 | $144.25 | $1.7M | +6.2% | -18.7% | -20.8% |
| TNDM | SELL | 2021-12-01 | 2021-12-01 | $128.44 | $128K | +7.4% | +21.7% | -8.7% |
| TNDM | SELL | 2021-11-01 | 2021-11-03 | $135.66 | $256K | +7.8% | +4.6% | -5.8% |
| TNDM | SELL | 2021-10-12 | 2021-10-14 | $129.28 | $1.3M | -1.7% | +3.4% | -3.4% |
| TNDM | SELL | 2021-10-01 | 2021-10-04 | $118.00 | $118K | +13.3% | +19.3% | +26.7% |
| TNDM | SELL | 2021-09-15 | 2021-09-17 | $121.79 | $1.7M | -0.4% | +2.0% | +18.7% |
| TNDM | SELL | 2021-08-16 | 2021-08-18 | $109.85 | $1.1M | +1.2% | +10.3% | +28.3% |
| TNDM | SELL | 2021-05-28 | 2021-06-01 | $86.47 | $626K | +9.5% | +15.9% | +33.4% |
| TNDM | SELL | 2021-05-18 | 2021-05-20 | $89.14 | $18K | +1.5% | +11.1% | +31.9% |
| TNDM | SELL | 2021-03-11 | 2021-03-12 | $90.22 | $1.6M | -4.1% | -0.1% | +4.1% |
| TNDM | SELL | 2020-10-13 | 2020-10-15 | $119.25 | $596K | -5.2% | -21.1% | -22.3% |
| TNDM | SELL | 2020-07-06 | 2020-07-07 | $101.66 | $407K | +1.0% | +3.3% | +11.3% |
| TNDM | SELL | 2020-06-03 | 2020-06-04 | $81.81 | $164K | +5.9% | +32.3% | +50.1% |
| TNDM | SELL | 2020-05-04 | 2020-05-04 | $78.33 | $157K | +2.9% | -0.7% | +28.0% |
| TNDM | SELL | 2020-04-06 | 2020-04-08 | $67.59 | $135K | +3.7% | +30.1% | +51.2% |
| TNDM | SELL | 2020-03-03 | 2020-03-04 | $77.16 | $154K | -39.4% | -22.5% | +4.0% |
| TNDM | SELL | 2020-02-13 | 2020-02-14 | $82.67 | $1.3M | -12.8% | -44.2% | -1.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.