FORM ▲ +4.4% - FormFactor, Inc. $FORM 4P - HLEO - Helio Corp /FL/* OFFICER - Chief Financial Officer: Knauf Mark Harry P | 16,246 | $1.486 | $24,135 FormFactor shares rose 4.4% today following a Form 4 filing disclosing that Chief Financial Officer Mark Harry P Knauf purchased 16,246 shares at $1.486 per share, representing a $24,135 investment in the company. Insider buying by a company officer can signal confidence in the company's near-term prospects and valuations. 21-SEP-2026 08:03 AM ET