FormFactor CEO Mike Slessor Sells 17,510 Shares

John Ballard, The Motley Fool

Tue, September 22, 2026 at 4:26 PM GMT+3 4 min read

FORM +4.17%

Mike Slessor, CEO of FormFactor, Inc. (NASDAQ:FORM), disclosed a sale of 17,510 shares of common stock on Sept. 16, 2026, in a recent SEC Form 4 filing.

Transaction summary

Transaction value based on SEC Form 4 weighted average sale price ($104.73); post-transaction value based on Sept. 16, 2026, market close ($104.82).

Key questions

What was the structural nature of this transaction?
The sale was non-discretionary, executed under a Rule 10b5-1 trading plan adopted in August 2025. This arrangement allows insiders to schedule trades in advance, which separates the timing of the liquidation from current market conditions or material non-public information.
How does the current price level relate to historical performance?
Shares were sold at prices between $103.65 and $105.80, at a time when the stock had recorded a 229% one-year total return as of the Sept. 16, 2026, transaction date.
What is the scale of the executive's remaining equity exposure?
Mike Slessor maintains a direct position of 466,694 shares, representing a market value of ~$49 million as of the Sept. 16, 2026, market close. This ownership reflects a 0.6% stake in the Livermore-based semiconductor testing specialist.
Does the executive hold other forms of beneficial ownership?
The filing indicates all reported equity is held directly by the CEO, with no indirect holdings or family trusts identified. The executive also continues to hold derivative securities alongside the common stock position.

Company Overview

Company Snapshot

FormFactor designs, manufactures, and globally distributes advanced test and measurement solutions for the semiconductor industry, with primary revenue streams from its Probe Cards and Systems divisions, which serve semiconductor manufacturers and research institutions.
The company operates a capital-intensive business model focused on developing proprietary probe card technology and test systems that enable semiconductor manufacturers to verify integrated circuit functionality during production, generating revenue through both product sales and system deployments.
FormFactor's primary customers are leading semiconductor manufacturers and research institutions that require advanced testing solutions to ensure product quality and optimize yield across diverse integrated circuit applications.

FormFactor is a specialized semiconductor testing solutions provider with a market capitalization of $8.6 billion and TTM revenues of $902 million, demonstrating significant scale within the semiconductor capital equipment sector.

The company maintains a competitive advantage through proprietary probe card technology and integrated test systems that address critical manufacturing requirements for semiconductor producers.

With 2,153 employees and operations centered in Livermore, California, FormFactor leverages its technical expertise and established customer relationships to serve the essential testing and measurement needs of the global semiconductor industry.

What this transaction means for investors

This sale shouldn't concern investors. It was executed under a Rule 10b5-1 plan that insiders use to avoid concerns of acting on non-public information. The executive retains a large stake in the stock worth about $49 million following the transactions.

Importantly, revenue grew 32% year over year in the second quarter. This is a notable acceleration over the -1% growth rate reported in the year-ago quarter.

The operating margin has also improved alongside revenue growth, reaching 22% in the recent quarter. Analysts expect earnings to grow at an annualized rate of 20% in the coming years.

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John Ballard has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends FormFactor. The Motley Fool has a disclosure policy.

FormFactor CEO Mike Slessor Sells 17,510 Shares was originally published by The Motley Fool