FormFactor Inc. (NASDAQ:FORM) fell 8.85% to $142.79 on June 23, 2026, declining with the broader semiconductor equipment sector as the Philadelphia Semiconductor Index dropped nearly 8% on Korean memory contagion and AI spending concerns.

Key Highlights

  • FormFactor closed at $142.79, down $13.87, as the semiconductor equipment group broadly declined amid a sector-wide risk-off event.
  • The stock had surged more than 155% year-to-date, with its wafer probe cards benefiting from increased testing demand across advanced logic and HBM memory production.
  • FormFactor's probe card products are essential infrastructure for semiconductor manufacturers testing chips at the wafer level before dicing.
  • No FormFactor-specific news drove the session's decline, which was attributable entirely to the broader semiconductor sector selloff triggered by the South Korean market collapse.

FormFactor Inc. (NASDAQ:FORM) fell 8.85% to close at $142.79 on June 23, 2026, declining with the semiconductor equipment sector as a confluence of macro forces triggered broad selling across all chip supply chain segments.

FormFactor designs and manufactures wafer probe cards, which are consumable testing interfaces used to verify the electrical functionality of chips while they are still on the wafer, prior to cutting and packaging. The company also produces analytical probe systems for semiconductor design and failure analysis, and thermal test subsystems for characterising chip performance across temperature ranges.

The June 23 selloff was driven by sector-wide forces. South Korea's Kospi fell 10%, pulling Samsung and SK Hynix each lower by more than 12%, which raised concerns about capital spending at major memory manufacturers that use FormFactor's probe cards in high-volume memory production. The Philadelphia Semiconductor Index fell nearly 8%, with leveraged ETF rebalancing amplifying directional selling across equipment and test names.

FormFactor had been a significant beneficiary of the AI-driven semiconductor capex cycle. Growing demand for high-bandwidth memory, which requires more complex and precise wafer-level testing than conventional DRAM, had driven elevated probe card orders. Advanced logic nodes at leading foundries also require more test iterations per wafer, increasing consumable probe card consumption per wafer start.

The stock's 155% year-to-date gain heading into June 23 had elevated its positioning risk. With a 52-week high of $159.09 recently set, the session's decline brought FormFactor back to approximately 90% of that peak.