The CEO and CTO selling concurrently is a cautionary signal, but the dollar amount is trivial relative to the $43.7B market cap. Given the poor historical track record of bullish reads on CBRS (avg -18% T+20 alpha), this selling cluster reinforces a bearish bias. Monitor for any upcoming earnings miss or negative press that may have prompted the sales. The non-cash derivative conversions by Benchmark and Foundation Capital suggest pre-IPO lockup expirations are being unwound, adding potential overhang.
Price Chart
Executive Summary
A cluster of insider selling at Cerebras Systems, led by CEO Andrew Feldman ($26.4M in open-market sales on Aug 21) and CTO Sean Lie ($3.4M), alongside director Eric Vishria ($2.2M), totals $32M in open-market sales over a 7-day window. While the dollar amount is modest relative to the $43.7B market cap (~0.07%), the participation of the CEO and CTO in the same week is notable. Historical calibration shows past bullish/long calls on CBRS have been heavily wrong (20% win rate, -18% avg T+20 alpha), suggesting the market has punished prior optimistic reads. The cross-filing actuarial verdicts flag this as an amplified signal due to the insider-trades + press-context combo, but the proportionality check (0.07% of market cap) keeps this from being a high-impact bearish signal on its own.
Key Financial Metrics
Key Facts
- CEO Andrew Feldman sold 132,676 shares for ~$26.4M in open-market sales on Aug 21 at ~$199-$200/share.
- CTO Sean Lie sold 16,293 shares for ~$3.4M on Aug 21 at $210.01/share.
- Director Eric Vishria sold 10,000 shares for ~$2.2M on Aug 17 at $224.20/share.
- Total open-market sales in the cluster: ~$32M, representing ~0.07% of the $43.7B market cap.
- All other insider transactions (conversions, exercises, gifts) were non-cash events with $0 economic value.
- Historical performance on CBRS reports shows a 20% win rate at T+20 with an average alpha of -18.43%, indicating prior bullish calls have been heavily wrong.
Financial Impact
~$32M in open-market insider sales over 7 days, ~0.07% of market cap
Risk Factors
- Insider selling by CEO and CTO may signal lack of confidence in near-term prospects.
- Historical calibration shows past bullish calls on CBRS have been heavily wrong (20% win rate, -18% avg T+20 alpha).
- Derivative conversions by major VCs (Benchmark, Foundation Capital) could precede further open-market sales.
- Stock is down significantly from recent highs (implied by CEO selling at ~$200 vs director selling at ~$224).
Market Snapshot
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-CBRS-1787774570943 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Sep 9, 2026 23d ago | Insider Cluster | $196.20 $190.47 | ▲ +2.92% | ▲ +2.26% | $169.52 (+13.60%) |
Sep 4, 2026 27d ago | 144 | $199.77 $184.03 | ▼ −7.88% | ▼ −6.76% | $169.52 (−15.14%) |
Sep 1, 2026 4w ago | Press Release | $172.62 $196.20 | ▲ +13.66% | ▲ +13.58% | $169.52 (−1.80%) |
Aug 25, 2026 5w ago | Insider Cluster | $182.15 $184.52 | ▲ +1.30% | ▲ +1.42% | $169.52 (−6.93%) |
Aug 25, 2026 5w ago | Insider Cluster | $182.15 $184.52 | ▼ −1.30% | ▼ −1.42% | $169.52 (+6.93%) |
Aug 25, 2026 5w ago | Insider Cluster | $182.15 $184.52 | ▼ −1.30% | ▼ −1.42% | $169.52 (+6.93%) |
Aug 22, 2026 5w ago | Insider Cluster | $185.43 $184.24 | ▲ +0.64% | ▲ +1.11% | $169.52 (+8.58%) |
Aug 21, 2026 6w ago | Insider Cluster | $196.13 $179.08 | ▼ −8.69% | ▼ −9.17% | $169.52 (−13.57%) |
Aug 19, 2026 6w ago | Insider Cluster | $209.76 $186.67 | ▼ −11.01% | ▼ −12.12% | $169.52 (−19.18%) |
Aug 19, 2026 6w ago | Insider Cluster | $209.76 $186.67 | ▼ −11.01% | ▼ −12.12% | $169.52 (−19.18%) |
US Market Status
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