Matt Zmigrosky is CLO & VP at Diamondback Energy, Inc. (FANG). They have made 17 open-market trades across 3 companies since 2019, most recently 2026-09-15.
CIK 0001767328
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 $53K since 2019, against 16 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| FANG | 36,705 | $7.5M |
| RTLR | 20,482 | $312K |
| VNOM | 4,253 | $191K |
| Total | $8.0M |
Shares reported on the most recent Form 4, priced at the 2026-09-17 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 |
|---|---|---|---|---|---|---|---|---|
| FANG | SELL | 2026-09-15 | 2026-09-17 | $212.56 | $282K | -6.3% | — | — |
| FANG | SELL | 2026-08-14 | 2026-08-17 | $202.77 | $507K | -3.9% | -6.8% | — |
| FANG | SELL | 2026-06-03 | 2026-06-04 | $210.00 | $1.1M | -6.7% | -13.8% | +1.0% |
| FANG | SELL | 2026-06-01 | 2026-06-02 | $200.54 | $1.0M | -5.6% | -15.5% | -1.5% |
| FANG | SELL | 2026-05-13 | 2026-05-14 | $200.10 | $1.0M | -4.9% | -6.3% | -0.9% |
| FANG | SELL | 2026-03-18 | 2026-03-19 | $190.51 | $1.6M | +3.9% | -3.6% | -2.5% |
| FANG | SELL | 2026-03-13 | 2026-03-17 | $180.00 | $7.5M | +7.3% | -0.8% | +1.0% |
| FANG | SELL | 2025-11-14 | 2025-11-18 | $148.18 | $519K | +7.2% | +0.9% | +15.7% |
| FANG | SELL | 2024-05-17 | 2024-05-20 | $198.15 | $1.2M | +1.4% | -1.9% | -0.3% |
| FANG | SELL | 2024-03-21 | 2024-03-25 | $193.94 | $970K | +3.9% | +4.4% | +0.7% |
| FANG | SELL | 2023-09-12 | 2023-09-14 | $157.17 | $851K | -2.4% | +6.8% | -4.7% |
| FANG | SELL | 2023-08-03 | 2023-08-07 | $150.16 | $1.7M | +1.6% | +7.5% | +10.3% |
| FANG | SELL | 2022-12-21 | 2022-12-22 | $136.96 | $551K | -0.8% | +10.5% | -5.3% |
| FANG | SELL | 2022-03-04 | 2022-03-08 | $136.77 | $821K | -1.1% | +3.1% | +17.3% |
| VNOM | SELL | 2021-12-08 | 2021-12-09 | $22.62 | $117K | -4.3% | +14.1% | +30.0% |
| FANG | SELL | 2021-12-08 | 2021-12-09 | $114.31 | $391K | -6.0% | +8.7% | +16.5% |
| RTLR | BUY | 2019-05-28 | 2019-05-29 | $17.50 | $53K | +0.4% | +2.8% | -8.1% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.