Reporting owner · CIK 0002132472

Lie Sean

SEC Form 4 history across 1 companies, 73 transactions and 4 filings.

CTOChief Technology OfficerCerebras Systems Inc.
Open-market transaction mix0% buys0 buys · 47 sales
Latest filingSep 28, 2026, 08:05 PM

Available history · Aug 18, 2026 – Sep 25, 2026

Filings4Form 4 records
Buying$00 purchases
Selling$192.1M47 sales
Net value−$192.1MBuys minus sells · disclosed values

Latest insider transactions

Form 4 filings from available history.
Lie Sean transactions · 20 per page
CompanyInsiderActivityDisclosed valueFiled (ET)
CBRSCerebras Systems Inc.
Lie SeanCTOS · sale10b5-1 detectedSEC filing ↗-$27.4MView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · sale10b5-1 detectedSEC filing ↗-$9.78MView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · sale10b5-1 detectedSEC filing ↗-$2.38MView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOG · gift10b5-1 detectedSEC filing ↗$0View disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOC · unknown10b5-1 detectedSEC filing ↗UnknownView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOC · unknownDerivative securitySEC filing ↗UnknownView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$185kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$2.14kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$2.60kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$47.9kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$70.8kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$138kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$52.2kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$64.4kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$56.2kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$10.8kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$33.7kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$21.7kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$78.8kView disclosure →
CBRSCerebras Systems Inc.
Lie SeanCTOS · saleSEC filing ↗-$103kView disclosure →
Open a transaction for shares, transaction date, ownership and the original SEC filing.

Latest Form 4 facts

Quick context from source filings

Latest open-market transaction

sale at Cerebras Systems Inc. on Sep 25, 2026 valued at $449,900.

Review SEC filing
Latest buy

No open-market insider purchase is available.

Latest sale

sale at Cerebras Systems Inc. on Sep 25, 2026 valued at $449,900.

Review SEC filing

Monthly open-market activity

Last 2 reported months · purchases and sales

View exact monthly values
MonthPurchasesSalesBuy valueSale valueNet value
Aug 2026037$0.00$155,774,228.56-$155,774,228.56
Sep 2026010$0.00$36,311,417.88-$36,311,417.88

Net value is disclosed purchases minus sales, not profit. A dash means the value is unavailable.

Ownership and transaction size

Ownership and ticket size

Average P/S size$4.1M
Median P/S size$391K
Direct73
Indirect0
Sep 25, 2026unknown

Filing-only signals

Deterministic matches in this insider's history

Cluster Sellingpattern37Derivative Transactionfiling-context15Direct Ownershipfiling-context67Large Holdings Increaseholdings3Large Holdings Reductionholdings6Large Salesize21Repeat Sellerpattern4510b5-1 Detectedfiling-context39

Associated companies

Companies in the disclosed reporting history

Cerebras Systems Inc.CBRS · 73 transactions · latest Sep 28, 2026, 08:05 PM

Open-market buy performance

90-day forward return on this insider's open-market purchases

90d forward
No open-market purchases in available history

A 90-day purchase return requires an open-market buy. No eligible purchases are recorded in this history.

Disclosed ownership

How reported shareholdings evolved

Non-derivative shares held after reported transactions—not stock prices or a complete portfolio.

55 observations · Aug 18, 2026 – Sep 25, 2026. Window ends at the latest available report, not today.

Selected observation · Sep 25, 2026309,569 shares reported
Inspect transaction
View exact observations and source transactions
Transaction dateShares held afterFiledSource
Aug 18, 2026616,706Aug 21, 2026View transaction
Aug 18, 2026616,705Aug 21, 2026View transaction
Aug 18, 2026615,646Aug 21, 2026View transaction
Aug 18, 2026613,839Aug 21, 2026View transaction
Aug 18, 2026612,495Aug 21, 2026View transaction
Aug 18, 2026610,825Aug 21, 2026View transaction
Aug 18, 2026608,931Aug 21, 2026View transaction
Aug 18, 2026605,208Aug 21, 2026View transaction
Aug 18, 2026601,799Aug 21, 2026View transaction
Aug 18, 2026600,200Aug 21, 2026View transaction
Aug 18, 2026599,708Aug 21, 2026View transaction
Aug 18, 2026599,506Aug 21, 2026View transaction
Aug 18, 2026599,171Aug 21, 2026View transaction
Aug 18, 2026598,714Aug 21, 2026View transaction
Aug 18, 2026598,367Aug 21, 2026View transaction
Aug 18, 2026598,272Aug 21, 2026View transaction
Aug 18, 2026598,125Aug 21, 2026View transaction
Aug 18, 2026598,078Aug 21, 2026View transaction
Aug 18, 2026597,835Aug 21, 2026View transaction
Aug 18, 2026597,558Aug 21, 2026View transaction
Aug 18, 2026597,334Aug 21, 2026View transaction
Aug 18, 2026596,744Aug 21, 2026View transaction
Aug 18, 2026596,443Aug 21, 2026View transaction
Aug 18, 2026596,240Aug 21, 2026View transaction
Aug 18, 2026596,229Aug 21, 2026View transaction
Aug 18, 2026596,220Aug 21, 2026View transaction
Aug 18, 2026595,449Aug 21, 2026View transaction
Aug 20, 20261,292,247Aug 22, 2026View transaction
Aug 20, 20261,079,173Aug 22, 2026View transaction
Aug 20, 20261,067,467Aug 22, 2026View transaction
Aug 20, 20261,019,701Aug 22, 2026View transaction
Aug 20, 2026886,318Aug 22, 2026View transaction
Aug 20, 2026793,301Aug 22, 2026View transaction
Aug 20, 2026684,794Aug 22, 2026View transaction
Aug 20, 2026565,483Aug 22, 2026View transaction
Aug 20, 2026450,507Aug 22, 2026View transaction
Aug 20, 2026404,293Aug 22, 2026View transaction
Aug 20, 2026393,578Aug 22, 2026View transaction
Aug 20, 2026368,926Aug 22, 2026View transaction
Aug 21, 2026385,219Aug 22, 2026View transaction
Aug 21, 2026368,926Aug 22, 2026View transaction
Sep 4, 2026415,067Sep 9, 2026View transaction
Sep 4, 2026399,029Sep 9, 2026View transaction
Sep 4, 2026345,569Sep 9, 2026View transaction
Sep 25, 2026465,569Sep 28, 2026View transaction
Sep 25, 2026429,569Sep 28, 2026View transaction
Sep 25, 2026429,069Sep 28, 2026View transaction
Sep 25, 2026419,892Sep 28, 2026View transaction
Sep 25, 2026389,327Sep 28, 2026View transaction
Sep 25, 2026359,336Sep 28, 2026View transaction
Sep 25, 2026338,314Sep 28, 2026View transaction
Sep 25, 2026331,445Sep 28, 2026View transaction
Sep 25, 2026317,669Sep 28, 2026View transaction
Sep 25, 2026311,769Sep 28, 2026View transaction
Sep 25, 2026309,569Sep 28, 2026View transaction

Securities and direct/indirect ownership contexts are kept separate and never summed. Joint filings may associate the same disclosed row with multiple owners. Unknown values are omitted, not treated as zero. Lines connect observations for readability; they do not establish holdings between filings, cost basis, or current ownership. Amendments and stock splits require reviewing the source.

Lie Sean Insider Activity FAQ

SEC Form 4 context

Who is Lie Sean?

Lie Sean is a reporting owner in SEC Form 4 filings with reporting owner CIK 0002132472.

Which companies has Lie Sean reported transactions for?

Cerebras Systems Inc.

When was Lie Sean's latest insider buy?

No open-market insider purchase is available for this period.

When was Lie Sean's latest insider sale?

sale at Cerebras Systems Inc. on Sep 25, 2026 valued at $449,900.

Where can I see the original SEC filings?

Each transaction row links directly to the source SEC filing so the reported Form 4 details can be reviewed.

Are performance metrics included?

The profile shows average and median 90-day stock returns after open-market purchases when price coverage is available. These are unadjusted stock returns, not realized trading gains. Win rates, benchmark-adjusted returns and conviction scores are not calculated.