Cerebras CTO and COO sold $228 million under prearranged plans before the lock-up expired November 9

At 6:00 a.m ¹. ET ¹ on Monday, November 9, the last door on Cerebras' IPO opened. The main lock-up on the chipmaker's shares expired 180 days after its May 13 prospectus, freeing holders of roughly 71.4% of Class A stock from contractual restrictions, three days before the company reports Q3 results on November 12 ¹. The market shrugged: the stock closed Monday at $96.70, up nearly 8% ³.

The headline number here is $228 million: the two big prearranged sales by the chief technology officer and the chief operating officer, recorded before the lock-up ended ¹. Adding a tax-related sale and a smaller plan sale brings the disclosed total to about $244 million ¹.

The money that is already gone

Cerebras▲+6.33% — Cerebras, up 6.33 percent today listed in May at $185 a share ¹. It closed 49.3% below that price on Monday morning, and options pricing implies a move of about 12% around Thursday's report, with implied volatility above 100% ¹³. Up to about 171.1 million shares can become eligible across the lock-up schedule, including up to 15 million held by directors and officers ¹.

The filings everyone watches cannot show the selling

Here is the complication: the 13Fs funds must file by November 16 show holdings as of September 30, six weeks before the door opened, and the prospectus' alternative lock-up trigger, the second trading day after earnings, also lands on November 16 ¹.

The only records that catch the selling are Form 144s and Form 4s↗, and they show two executives out early ¹. CTO Sean Lie sold 710,247 shares for about $147.63 million on August 20 and 60,000 more for about $6.5 million on October 27; COO Dhiraj Mallick sold 396,000 shares for about $80.8 million on September 29, all under prearranged 10b5-1 plans ¹. Mallick's remaining $8.64 million sale in August was not discretionary: his Form 4 identifies it as a sell-to-cover transaction to satisfy tax withholding ¹.

Thursday settles margin, not demand

The guide is the tell. Management projects core revenue of $214 to $216 million↗ against $209.9 million in Q2, essentially flat, with core gross margin guided down to 38 to 40% and core operating margin worsening to negative 25% to negative 23% ¹³⁴. Against that sits $25.4 billion of remaining performance obligations at June 30, mostly OpenAI'sPVT$1.18T — OpenAI, private, latest valuation $1.18T commitment to buy 750 megawatts with an option for 1.25 gigawatts more ¹. That is about 29 years of the full-year revenue guide; it promises megawatts, not next quarter ¹.

The fight under the margin

Short seller Culper Research alleged on October 28 that the wafers last 1.5 to 2.5 years, that Cerebras uses a third-party connector called PariPoser, and that the company runs continuous dummy operations to guard against temperature swings that could damage its wafers ¹. CEO Andrew Feldman answered that fewer than 0.5% of deployed CS-3 wafers have been decommissioned, that TSMC▲+2.40% — TSMC, up 2.40 percent today qualifies the wafer for 10 years at 105 degrees Celsius, and that no PariPoser ever shipped; the useful-life estimate moved from 1-3 years to 3-5 years as assets shifted to the cloud fleet ¹. Feldman discloses he is long the stock ¹.

The bulls have not flinched. Wedbush kept Outperform but cut its target to $190 from $290↗; the consensus target sits near $275 against a $96 stock, with Altimeter, Tiger Global and ARK among the June 30 holders now 59% underwater ²³.

What to watch

Watch the Form 144 tape, the first place any big unlocked seller shows up, then February's 13Fs, which show who still held at December 31 ¹. And watch the gross margin line on Thursday: if it holds the guide, the overhang is noise; if it slides, Culper's number is eating the economics.