Ronald B. Stark is VP & Chief Accounting Officer at NRG ENERGY, INC. (NRG). They have made 1 open-market trade across 1 company since 2026, most recently 2026-08-19.
CIK 0001329875
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 1 sale. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MWH | 75,856 | $2.0M |
| NRG | 23,765 | $2.0M |
| ALTM | 84,644 | $494K |
| LTHM | 12,581 | $208K |
| Total | $4.7M |
Shares reported on the most recent Form 4, priced at the 2026-08-21 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 |
|---|---|---|---|---|---|---|---|---|
| MWH | SELL | 2026-08-19 | 2026-08-21 | $0.00 | $0 | -11.6% | -1.7% | — |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.