John Frederick Ek is CFO at GenMark Diagnostics, Inc. (GNMK). They have made 24 open-market trades across 2 companies since 2019, most recently 2025-07-08.
CIK 0001767921
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 $100K since 2023, against 23 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| AKYA | BUY | 2023-06-12 | 2023-06-12 | $5.00 | $100K | +15.2% | +22.5% | -26.3% |
| GNMK | SELL | 2021-01-25 | 2021-01-25 | $14.24 | $263K | -6.4% | +24.0% | N/A |
| GNMK | SELL | 2020-11-24 | 2020-11-25 | $13.17 | $19K | +8.8% | +20.2% | +55.1% |
| GNMK | SELL | 2020-11-19 | 2020-11-20 | $13.85 | $23K | +2.6% | +10.5% | +61.2% |
| GNMK | SELL | 2020-09-22 | 2020-09-24 | $13.82 | $1.1M | +8.4% | -12.5% | +15.6% |
| GNMK | SELL | 2020-09-16 | 2020-09-18 | $12.98 | $149K | +5.0% | -16.3% | +0.6% |
| GNMK | SELL | 2020-08-25 | 2020-08-26 | $14.14 | $21K | -14.2% | +1.7% | -3.2% |
| GNMK | SELL · 10b5-1 | 2020-08-20 | 2020-08-24 | $15.60 | $40K | -17.1% | -4.2% | -6.2% |
| GNMK | SELL | 2020-08-14 | 2020-08-18 | $15.98 | $1.1M | -17.5% | -23.3% | -14.6% |
| GNMK | SELL | 2020-05-28 | 2020-06-01 | $9.52 | $14K | -0.8% | +51.5% | +31.7% |
| GNMK | SELL | 2020-05-19 | 2020-05-20 | $10.46 | $17K | -4.7% | +30.2% | +58.9% |
| GNMK | SELL | 2020-02-27 | 2020-02-28 | $3.51 | $4K | +54.9% | +16.0% | +175.1% |
| GNMK | SELL | 2020-02-25 | 2020-02-27 | $3.81 | $2K | +33.1% | +13.7% | +169.7% |
| GNMK | SELL | 2020-02-20 | 2020-02-21 | $3.80 | $34K | +14.2% | +6.0% | +144.8% |
| GNMK | SELL | 2020-01-21 | 2020-01-23 | $4.80 | $13K | +3.9% | -25.6% | +73.1% |
| GNMK | SELL | 2019-11-25 | 2019-11-26 | $5.43 | $8K | -0.6% | -12.7% | -32.2% |
| GNMK | SELL | 2019-11-20 | 2019-11-21 | $5.55 | $3K | +1.1% | -8.1% | -26.9% |
| GNMK | SELL | 2019-08-27 | 2019-08-30 | $6.03 | $9K | +0.5% | +2.4% | -5.7% |
| GNMK | SELL | 2019-08-20 | 2019-08-21 | $6.25 | $3K | -6.2% | -1.6% | -10.7% |
| GNMK | SELL | 2019-08-05 | 2019-08-08 | $5.87 | $11K | -4.9% | -12.2% | -13.1% |
| GNMK | SELL | 2019-05-30 | 2019-05-31 | $6.60 | $6K | +4.2% | -3.7% | -9.1% |
| GNMK | SELL | 2019-05-23 | 2019-05-24 | $6.85 | $3K | +2.3% | -3.5% | -4.7% |
| GNMK | SELL | 2019-05-21 | 2019-05-22 | $6.83 | $3K | -0.6% | -2.5% | -7.0% |
| GNMK | SELL | 2019-02-25 | 2019-02-27 | $6.79 | $35K | -10.2% | -10.6% | -15.5% |
| GNMK | SELL | 2019-02-20 | 2019-02-21 | $6.16 | $4K | +3.5% | +1.1% | -2.7% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.