Sean Lie is CTO at Cerebras Systems Inc. (CBRS). They have made 2 open-market trades across 1 company since 2026, most recently 2026-09-25.
CIK 0002132472
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 2 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| CBRS | 309,569 | $39.4M |
Shares reported on the most recent Form 4, priced at the 2026-09-28 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 |
|---|---|---|---|---|---|---|---|---|
| CBRS | SELL · 10b5-1 | 2026-09-25 | 2026-09-28 | $208.97 | $25.1M | -16.6% | — | — |
| CBRS | SELL · 10b5-1 | 2026-09-04 | 2026-09-08 | $210.16 | $11.2M | +0.1% | -15.3% | — |
| CBRS | SELL · 10b5-1 | 2026-08-20 | 2026-08-21 | $207.90 | $151.1M | -2.9% | +9.5% | — |
| CBRS | SELL | 2026-08-18 | 2026-08-20 | $222.22 | $4.7M | -17.5% | -0.6% | — |
| CBRS | SELL | 2026-06-25 | 2026-06-29 | $170.07 | $1.7M | +3.9% | -18.3% | -5.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.