CBRS
Cerebras Systems Inc. · Technology · Market cap $17.8B
Insiders sold $387.7M net in the last 90 days ·7 sellers, 0 buyers· 10 of 16 sales under Rule 10b5-1 plans· latest Form 4 filed Sep 30, 2026
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$408.4M
reported sales (SEC code S)
Unique Insiders
7
in the rolling window
Latest filing
Oct 7, 2026
Komin Robert Patrick Jr.
Cerebras Systems Inc. (CBRS) has 55 SEC Form 4 filings (481 transaction rows) in the rolling window, disclosed by 7 distinct insiders. Most recent filing: Oct 7, 2026.
Inside the rolling window, 7 insiders at Cerebras Systems Inc. reported no open-market purchases and 23 open-market sales totaling $408.4M. The most active filer is Chief Technology Officer Lie Sean with 6 filings. Insiders have net sold $408.4M over the trailing 6 months. The most recent open-market filing is a sale of 32,500 shares by Chief Financial Officer Komin Robert Patrick Jr., dated Sep 29, 2026, worth $6.6M.
- Industry:Semiconductors
- CEO:Andrew D. Feldman
- Employees:708
- HQ:Sunnyvale, CA, US
- IPO:2026-05-14
| Source | |||||||
|---|---|---|---|---|---|---|---|
Komin Robert Patrick Jr.First filing | Chief Financial Officer | Sale | 32,500 | $6.6M | Sep 30 | -33.6% | SEC ↗ |
| Chief Operating Officer | Sale | 396,000 | $80.8M | Sep 30 | — | SEC ↗ | |
| Chief Accounting Officer | Sale | 1,320 | $270K | Sep 30 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 120,000 | $25.1M | Sep 28 | — | SEC ↗ | |
| Director | Sale | 50,000 | $10.5M | Sep 9 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 53,460 | $11.2M | Sep 9 | — | SEC ↗ | |
| CEO, President | Sale | 37,441 | $7.9M | Sep 9 | — | SEC ↗ | |
| CEO, President | Sale | 237,559 | $47.3M | Aug 25 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 710,247 | $147.6M | Aug 22 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 16,293 | $3.4M | Aug 22 | — | SEC ↗ | |
| Chief Accounting Officer | Sale | 4,574 | $1.0M | Aug 21 | — | SEC ↗ | |
| Chief Operating Officer | Sale | 38,889 | $8.6M | Aug 21 | — | SEC ↗ | |
| Chief Technology Officer | Sale | 21,257 | $4.7M | Aug 21 | — | SEC ↗ | |
| CEO, President | Sale | 26,644 | $5.9M | Aug 20 | — | SEC ↗ | |
Vishria EricFirst in 6 months | Director | Sale | 68,268 | $15.7M | Aug 19 | — | SEC ↗ |
Vassallo StevenFirst filing | Director | Sale | 50,000 | $10.9M | Aug 18 | — | SEC ↗ |
| Chief Operating Officer | Sale | 10,000 | $2.1M | Jul 1 | — | SEC ↗ | |
| Chief Operating Officer | Sale | 49,445 | $8.6M | Jun 29 | — | SEC ↗ | |
| Chief Operating Officer | Sale | 20,000 | $3.5M | Jun 29 | — | SEC ↗ | |
| Chief Accounting Officer | Sale | 6,125 | $1.1M | Jun 29 | — | SEC ↗ | |
| Chief Accounting Officer | Sale | 3,954 | $688K | Jun 29 | — | SEC ↗ | |
Feldman Andrew D.First filing | CEO, President | Sale | 17,990 | $3.1M | Jun 29 | — | SEC ↗ |
Lie SeanFirst filing | Chief Technology Officer | Sale | 10,033 | $1.7M | Jun 29 | — | SEC ↗ |
Earnings: last 7 quarters
Frequently asked questions
How many SEC Form 4 insider filings does CBRS have?
Cerebras Systems Inc. (CBRS) has 55 SEC Form 4 filings (481 transaction rows) in the rolling 365-day window, disclosed by 7 distinct insiders. Most recent filing: Oct 7, 2026.
When was the most recent SEC Form 4 filing for CBRS?
The most recent Form 4 filing for CBRS on Tracefour is dated Oct 7, 2026.
Who is the most active insider at CBRS?
The most active SEC Form 4 filer at CBRS in the rolling window is Chief Technology Officer Lie Sean, with 6 filings.
What is the net insider flow at CBRS over the last 6 months?
Over the trailing 180 days, insiders at CBRS have net sold $408.4M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at CBRS in the current window?
Inside the rolling window, insiders at CBRS bought $0 and sold $408.4M based on SEC Form 4 filings.
Can I get alerts for CBRS insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at Cerebras Systems Inc. (CBRS). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
Cerebras Systems Inc. is in the Technology sector.