On June 30, FormFactor rose 5.01% in regular trading, trading at $151.51/share, with turnover of approximately $25.90 million. The rally was driven by continued passive fund inflows following the company's formal addition to the US large-cap Russell 1000 Index, which took effect on June 29.

FormFactor officially joined the Russell 1000 Index as part of the 2026 Russell indexes reconstitution. Passive funds tracking the index concentrated their allocation adjustments around the effective date, generating sustained incremental capital inflows that extended the stock's upward momentum into the following session. On the institutional front, B. Riley upgraded FormFactor from Neutral to Buy with a $165 price target, while Evercore ISI raised its rating to Outperform with a $155 target. The company reported Q1 revenue of $230 million with gross margin improving 5.1 percentage points sequentially to 49.0%, providing fundamental support for the index inclusion and analyst upgrades to resonate positively.

Within the Semiconductor Equipment sector, peers also posted gains, with KLA-Tencor up 5.69%, Lam Research up 4.66%, ASML Holding up 4.11%, Applied Materials up 3.34%, and Enphase Energy up 1.43%.

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