Brett R. Whitmire is CFO at DIODES INC /DEL/ (DIOD). They have made 18 open-market trades across 1 company since 2019, most recently 2026-05-13.
CIK 0001768901
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 18 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| DIOD | 44,632 | $3.7M |
Shares reported on the most recent Form 4, priced at the 2026-05-13 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 |
|---|---|---|---|---|---|---|---|---|
| DIOD | SELL | 2026-05-13 | 2026-05-13 | $103.34 | $1.7M | +6.2% | +6.8% | +1.2% |
| DIOD | SELL | 2026-02-13 | 2026-02-17 | $71.22 | $424K | -0.5% | -2.1% | +38.4% |
| DIOD | SELL | 2026-02-03 | 2026-02-04 | $60.85 | $51K | +15.8% | +6.1% | +92.9% |
| DIOD | SELL | 2025-08-27 | 2025-08-28 | $55.90 | $112K | -5.7% | -5.3% | -17.3% |
| DIOD | SELL | 2025-02-04 | 2025-02-05 | $56.04 | $47K | -5.0% | -15.4% | -33.3% |
| DIOD | SELL | 2024-08-29 | 2024-09-03 | $69.99 | $133K | -1.6% | -0.8% | +4.5% |
| DIOD | SELL | 2024-02-28 | 2024-02-29 | $67.30 | $229K | +3.2% | +2.8% | +4.6% |
| DIOD | SELL | 2024-02-02 | 2024-02-05 | $66.81 | $111K | +3.0% | -0.1% | +10.2% |
| DIOD | SELL | 2023-05-18 | 2023-05-19 | $93.23 | $339K | -3.9% | -2.9% | -15.5% |
| DIOD | SELL | 2023-02-16 | 2023-02-16 | $95.02 | $378K | -1.5% | -3.7% | -1.1% |
| DIOD | SELL | 2023-02-02 | 2023-02-03 | $93.72 | $36K | +4.6% | -1.1% | -9.3% |
| DIOD | SELL | 2022-11-16 | 2022-11-17 | $85.86 | $590K | +3.1% | -10.9% | +7.3% |
| DIOD | SELL | 2022-07-05 | 2022-07-06 | $60.00 | $36K | +10.1% | +31.3% | +15.6% |
| DIOD | SELL | 2021-02-24 | 2021-02-25 | $81.36 | $369K | +5.5% | +0.4% | -2.5% |
| DIOD | SELL | 2021-02-22 | 2021-02-23 | $83.47 | $332K | -3.2% | -1.7% | -5.2% |
| DIOD | SELL | 2020-08-11 | 2020-08-14 | $52.02 | $161K | -2.5% | -6.1% | +20.3% |
| DIOD | SELL | 2020-05-18 | 2020-05-19 | $46.86 | $212K | +3.2% | +6.3% | +11.0% |
| DIOD | SELL | 2019-08-13 | 2019-08-14 | $38.00 | $80K | +4.0% | +11.7% | +26.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.