FORM FORMFACTOR INC Insider Trading

Mike Slessor (then-CEO) sells 4,735 shares for $560,194.72 via 10b5-1 plan; stock down 23.6% in 30 days

Mike Slessor, who was CEO at the time of the filing, executed 6 separate sales totaling 4,735 shares for $560,194.72 at blended average price $118.31 on 2026-07-15, reducing his holdings to 430,412 shares (a -1.1% net change). This transaction is part of a pre-arranged 10b5-1 trading plan adopted on 2025-08-19, meaning the sales were scheduled rather than discretionary. The current price of $107.11 sits -33.2% from the 52-week high of $160.27, and the stock has declined 23.6% over the past 30 days and 21.9% over 90 days. His prior sales at this ticker (5 trades on 2026-06-10) showed mixed near-term outcomes, with 30-day returns ranging from -4.2% to -0.2%; longer-term measurability is not yet available for those trades. The scheduled nature of this divestiture limits inference about insider conviction regarding current valuation or near-term prospects.

CEO Mike Slessor sold 11,890 shares for $1,442,897.43 via 10b5-1 plan on 2026-06-10

Mike Slessor, who was CEO at the time of this filing, executed 7 separate sales totaling 11,890 shares for $1,442,897.43 on 2026-06-10 under a pre-arranged 10b5-1 trading plan adopted on 2025-08-19. This is a scheduled transaction, not discretionary activity. The blended average sale price of $121.35 sits below the current price of $130.24, meaning the stock has risen since the sale date. Slessor's prior trades at FORM show a pattern of negative returns after sales (ranging from -11.3% to -5.7% over both 30 and 90 days), though his cross-ticker track record shows an average 90-day return of -4.9% after sells. The post-transaction holding of 435,147 shares represents a -2.7% reduction in his FORM position. Given the scheduled nature of the transaction under a Rule 10b5-1 plan, this represents a predetermined execution rather than a discretionary timing decision by the insider.

CEO Mike Slessor sells 9,438 shares ($1.2M) via pre-arranged 10b5-1 plan; holdings remain substantial at 447.0K shares.

Mike Slessor, CEO of FormFactor Inc, executed a multi-tranche sale of 9,438 shares on 2026-05-13, raising $1,194,063.98 at prices ranging from $122.84 to $136.15, with a blended average of $126.52. This transaction is part of a pre-arranged 10b5-1 trading plan adopted on 2025-08-19, indicating the sale was scheduled and non-discretionary rather than a discretionary response to current market conditions. Slessor retains 447,037 shares post-transaction, maintaining a substantial ownership stake. Historically, his prior five sales at FormFactor have shown poor timing, with a 0% well-timed rate at the 90-day mark and all prior trades showing positive subsequent returns (indicating he sold before rallies). His cross-ticker track record similarly shows weak timing with a 0.00% well-timed rate, though the stock is currently -19.6% from its 52-week high of $159.09 and trading at $127.99.

CEO SLESSOR sells 11,294 shares in 5 transactions totaling $1.4M at peak price of $129.62

On 2026-04-15, SLESSOR MIKE (CEO) executed 5 separate sales totaling 11,294 shares for $1,442,462.75 at a blended average price of $127.72. The transaction occurred at the current price of $129.62, which represents the stock's 52-week high (+0.0% from 52-week high), following a dramatic 30-day surge of +43.5% and 90-day gain of +72.2%. His post-transaction holdings remain substantial at 449,565 shares (449.6K shares), a -2.5% reduction from pre-transaction holdings of 460,859 shares (460.9K shares). While this represents a meaningful absolute dollar amount, the sale represents only a modest percentage reduction in his overall position. His cross-ticker track record shows 9 prior sells with a 90-day well-timed rate of 0.00%, and his prior sales at FormFactor have mixed measurable outcomes (30-day returns of -1.9% and -0.7% where measured, though three recent March sales lack outcome measurement yet).

CEO Mike Slessor sells 10,227 shares ($973,076.31) at blended $95.15; holds 460,859 shares post-transaction.

CEO Mike Slessor executed 3 separate sales on 2026-03-18, totaling 10,227 shares for $973,076.31 at an average price of $95.15, reducing his holdings by 2.2% to 460,859 shares. The timing of this sale relative to FormFactor's current price of $96.18 indicates the CEO sold just slightly below today's market level. His prior 5 same-ticker trades at FormFactor have produced mixed measurable outcomes: two January sales showed 30-day gains of +26.6% and +25.2%, while three February sales lack yet-measurable returns. Cross-ticker, his 6 prior open-market sales averaged a 30-day return of +26.9%, though 0 of those prior same-ticker sells were well-timed at the 90-day horizon—a pattern investors should track. Fundamentals show a P/E of 291.45 on quarterly revenue of $202.7M and net income of $15.7M, suggesting the stock is richly valued by traditional metrics despite the company's +74.8% 90-day gain.

CEO Slessor sold 8,664 shares for $815,596.72 on 2026-02-18 at avg $94.14; holds 471,086 shares post-sale.

SLESSOR MIKE (CEO) filed 3 separate sales totaling 8,664 shares for $815,596.72 at blended average price $94.14, reducing his stake from 479,750 to 471,086 shares (-1.8% of holdings). The stock has appreciated 20.9% over the prior 30 days and 94.3% over 90 days, currently trading at $94.68. His same-ticker transaction history shows 3 prior sells (on 2026-01-15 and 2026-01-06) with 30-day returns of +26.6%, +25.2%, and +29.0% respectively; timing assessment for the 90-day horizon is not yet measurable on those trades. With FormFactor's valuation at P/E of 178.64 and the stock within 2.1% of its 52-week high, this CEO sale follows a sustained recovery and represents a small net reduction in a substantial position that remains material at 471,086 shares.

CEO SLESSOR MIKE sold 13,088 shares at $76.81 avg on 2026-01-15 for $1.0M; stock at 52-week high

CEO Mike Slessor executed 2 separate sales totaling 13,088 shares for $1,005,266.56, reducing his holding to 472,907 shares from 485,995 shares (-2.7%). The transactions occurred at an average price of $76.81, near the current price of $75.28 and at the 52-week high of $75.28. The stock has appreciated significantly over recent periods (30-day change: +34.5%, 90-day change: +79.0%), following strong fundamental performance with annual revenue growth of +15.2% and net income of $15.7M on quarterly revenue of $202.7M. His cross-ticker track record shows only 1 prior sell, and his prior FORM transaction on 2026-01-06 (a sell 9 days earlier) has not yet allowed a measurable 90-day outcome. The modest reduction in holdings (-2.7%) against the backdrop of a 52-week high in stock price warrants monitoring of whether this represents a discrete rebalancing event or the start of a broader liquidation pattern.

CEO Mike Slessor sold 39,606 shares of FormFactor at $65.00 on 2026-01-06 for $2,574,390; stock at 52-week high.

CEO Mike Slessor sold 39,606 shares (39.6K shares) at $65.00, representing a 7.5% reduction in his holdings from 525,601 to 485,995 shares. The sale occurred at the stock's 52-week high of $64.00, with the stock up 11.4% over 30 days and 67.6% over 90 days. FormFactor's fundamentals show strong recent performance with revenue of $202,676,000.00, net income of $15,656,000.00, and annual revenue growth of 15.2%, though the P/E ratio of 120.75 reflects a premium valuation. The timing and pricing of this sale—at the peak of a sustained uptrend—alongside the stock's elevated multiple merit investor attention.