On October 9, FormFactor rose 5.45% in pre-market trading, trading at $140.5/share, with turnover of $525,300. The move follows S&P Dow Jones Indices' announcement that FormFactor joined the S&P MidCap 400 on October 6, replacing Twilio. Index inclusion typically generates passive fund demand, supporting the share price.

Additionally, the company confirmed it will report fiscal third quarter results on October 28, with market expectations of $0.75 EPS, slightly above the prior quarter's $0.74. The semiconductor equipment sector traded broadly higher, with ASML up 3.11%, KLA up 2.0%, and Applied Materials up 1.76%.

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