MGNI MAGNITE, INC. Insider Trading

CEO Michael G. Barrett sells 278,596 shares ($4.7M) at $16.92 avg; retains 403,074 shares plus 915,128 options.

Michael G. Barrett executed 2 separate sales totaling 278,596 shares for $4,712,907.64 on 2026-06-15 and 2026-06-16, reducing his non-derivative holdings by -40.9%. This transaction is part of a pre-arranged 10b5-1 trading plan adopted on 2026-03-13, meaning the sales were scheduled rather than discretionary. Barrett retains 403,074 non-derivative shares and holds 915,128 shares through derivative securities (two separate employee stock option grants), so his overall economic exposure to MGNI remains substantial. At the current price of $18.24, the stock has appreciated 36.2% in the 30-day window and 46.0% in the 90-day window following these scheduled transactions. His prior trades at MGNI have shown variable outcomes, with three of five prior sales followed by 30-day gains (14.7%, 28.8%, 35.4%) and most followed by 90-day gains, though two sales were followed by declines (-40.7%, -24.8%). The company reports recent quarterly revenue of $164,371,000.00, net income of $4,412,000.00, and a P/E of 16.43, reflecting profitable operations at a valuation below the 52-week high of $26.65.

MGNI President of Revenue sells 40,000 shares for $1,003,400.00 across two days at $25.56–$24.61

Sean Patrick Buckley, President of Revenue at Magnite, executed 2 separate sales totaling 40,000 shares for $1,003,400.00 on September 8–9, 2025, at prices ($25.56 and $24.61) near the stock's 52-week high of $26.52. His post-transaction holdings of 287,193 shares represent a -12.2% reduction. Buckley's prior MGNI sales on 2024-07-15 and 2024-07-16 both showed negative 90-day returns (-13.7% and -20.0%), establishing a pattern where his exits at this ticker preceded declines. The current stock price of $23.89 is now -9.9% from the 52-week high, consistent with post-sale weakness seen in his prior trades. Given his title in revenue operations and the company's modest 7.8% annual revenue growth, the timing and scale of this sale warrant investor attention to whether fundamentals are signaling headwinds the market has not yet priced.

CPO Adam Lee sells 24,986 shares across 2 transactions at $24.22–$24.97; stock up 11.1% in 30 days, near 52-week high.

Adam Lee, Chief Product Officer at Magnite, executed 2 separate sales totaling 24,986 shares for $616,948.67, reducing his holdings from 371.4K to 346.4K shares (-6.7%). The sales occurred at a blended average price of $24.69, within the current market price of $24.85 and near the 52-week high of $26.52. The stock has appreciated 11.1% over 30 days and 41.2% over 90 days, reflecting strong recent momentum in the broader market context. His prior sales at this ticker (June 24 and July 3, 2025) show mixed outcomes: one preceded a subsequent 30-day gain of 14.8%, while the other was followed by a 30-day decline of 11.2%. With a high P/E of 82.83 and modest revenue growth of 7.8% year-over-year, the timing and magnitude of this sale warrant attention to whether it reflects portfolio rebalancing or shifts in near-term sentiment at elevated valuation levels.

MGNI President Katie Seitz Evans sold 21,509 shares at $25.52 for $548,909.68; retains 394,089 shares post-sale.

Katie Seitz Evans, President of Operations at Magnite, sold 21,509 shares on 2025-08-27 at $25.52, reducing her holdings by 5.2% to 394,089 shares. The sale occurs near the 52-week high ($26.52), with the stock up 13.8% over 30 days and 58.6% over 90 days—a period of strong upward price momentum. Across her open-market trade history, Evans' three prior sells showed mixed outcomes: two measured trades at MGNI in June resulted in +3.7% and -5.0% 30-day returns, while an earlier June sale preceded a +41.3% gain, with timing patterns not yet conclusive due to insufficient 90-day windows. The company shows modest fundamentals with annual revenue growth of +7.8%, $173.3M quarterly revenue, and a high P/E of 86.50 relative to net income of $11.1M, suggesting elevated valuation. The sale quantity and timing warrant observation but lack definitive pattern clarity given limited historical 90-day outcome data at this ticker.

MGNI CEO sold 35,951 shares at $23.85 for $857.4K; stock now $21.84, -11.5% from 52-week high. Prior timing mixed.

Michael G. Barrett, CEO of Magnite, sold 35,951 shares at $23.85 on 2025-08-18, reducing his post-transaction holdings to 249.9K shares (-12.6% of prior position). At the current price of $21.84, the stock has fallen 10.6% in 30 days and is trading -11.5% below its 52-week high of $24.67. Examining his same-ticker history at MGNI, four of five prior measurable 30-day outcomes following his sells were positive (ranging +1.4% to +35.4%), but his only completed 90-day outcome (the 2024-12-04 sale) resulted in a -16.4% decline—one of one well-timed at the 90-day mark. His cross-ticker track record shows 13 prior sells with an average 30-day return of +10.7% and 90-day return of +5.1%, with a well-timed rate of 44.44%, indicating his sells have historically preceded declines less than half the time. The current 30-day deterioration in MGNI aligns with his recent pattern at this ticker, but the stock's elevated valuation (P/E of 72.80) and modest annual revenue growth of +7.8% provide context for elevated exit activity.

CEO Michael G. Barrett sells 70,900 MGNI shares at $23.27; holdings fall to 285,808 shares (-19.9%)

CEO Michael G. Barrett sold 70,900 shares of MAGNITE at $23.27 on 2025-07-15, reducing his holdings by 19.9% to 285,808 shares post-transaction. The sale occurred against a backdrop of strong recent stock momentum—MGNI has risen 33.1% in the past 30 days and 118.1% over 90 days, trading just 1.6% below its 52-week high of $24.67. However, the company faces fundamental headwinds: net income is negative at $-9.6M on revenue of $155.8M, and the stock carries a P/E ratio of 110.32, indicating significant valuation premium. Barrett's cross-ticker trading history shows a mixed pattern (44.44% well-timed sell rate across all holdings), while his five prior trades at MGNI show only 1 of 2 measurable 90-day outcomes was well-timed (sell on 2024-12-04 generated a -16.4% return, correctly anticipating a decline). The concentration of sales activity in June 2025 (three sales in nine days: June 16, 18, and 24) followed by this July transaction, combined with substantial position reduction, warrants monitoring for what may indicate shifting views on valuation or execution.

MGNI CPO Soroca sells 42,584 shares at $25.00 for $1.1M; holds 366,672 post-transaction.

Soroca Adam Lee, Chief Product Officer of MAGNITE, sold 42,584 shares (42.6K shares) at $25.00 on 2025-07-03 for $1,064,600.00, reducing his holdings by 10.4% from 409,256 to 366,672 shares. The sale occurred near the company's 52-week high of $24.67, and at a $1.50 premium to the current price of $23.53. The insider's cross-ticker sell history consists of only 1 prior transaction, providing limited historical context; at this specific ticker, he has 1 prior measurable trade (a sell on 2025-06-24). Magnite faces mixed fundamentals: revenue of $155,771,000.00 with positive annual growth of +7.8%, but negative net income of $-9,634,000.00 and an elevated P/E of 106.95, signaling the market prices the stock on growth expectations rather than current profitability.

Magnite President of Operations Katie Seitz Seitz sells 24,495 shares for $571,164.00 at blended price $23.32

Katie Seitz Seitz, President of Operations at Magnite, executed two separate sales on 2025-06-30, selling 8,358 shares at $22.00 and 16,137 shares at $24.00, reducing her holdings from 458,925 shares to 434,430 shares (a -5.3% reduction). The current price of $24.67 sits at the 52-week high, with the stock up 47.9% over the prior 30 days and 154.3% over 90 days, meaning her sales occurred in the context of sustained price momentum. Her prior trade at this ticker (a sell on 2025-06-05) has not yet reached the 90-day measurement window needed to assess timing, and her cross-ticker track record shows only 1 prior sell with no established pattern of timing accuracy. The company faces fundamental headwinds: net income of $-9,634,000.00 against revenue of $155,771,000.00, combined with a P/E ratio of 112.14, despite annual revenue growth of 7.8%.

MGNI CPO Soroca sells 44.5K shares at $20.00; stock now at $20.97, near 52-week high of $21.17

Soroca Adam Lee, Chief Product Officer of Magnite, sold 44,519 shares at $20.00 on 2025-06-24, reducing his holdings from 445,446 shares to 400,927 shares (a 10.0% reduction). The sale occurred at a price below the current market level of $20.97 and near the 52-week high of $21.17, in a period when the stock has appreciated 30.2% over 30 days and 80.8% over 90 days. Magnite remains unprofitable (net income of $-9.6M on revenue of $155.8M for the latest quarter), carries a high valuation multiple (P/E 95.32), and the transaction timing relative to strong recent price momentum creates a mixed signal. Investors should note the asymmetry between the sharp recent gains and the company's continued operating losses.

CEO BARRETT MICHAEL G. sold 300,000 shares of MGNI at $20.01; holds 356,708 shares post-sale (-45.7%)

CEO Barrett Michael G. executed a substantial sale of 300,000 shares (45.7% of his pre-transaction holdings) at $20.01, reducing his stake to 356,708 shares. This represents a significant reduction in his equity position at a price near the 52-week high of $21.17, at a time when the stock has already appreciated 30.2% over 30 days and 80.8% over 90 days. His cross-ticker track record shows a 90-day well-timed sell rate of 44.44%, but at MGNI specifically, only 1 of 3 prior measurable sales (33.3%) were well-timed at the 90-day mark, with 2 prior sales occurring just 6 and 8 days before this transaction on 2025-06-18 and 2025-06-16. Investors should note the compressed timing of these three consecutive sales in a 10-day window and the fundamentals backdrop: the company is unprofitable (net income of $-9,634,000 in the latest quarter), carries a high P/E of 95.32, and has modest annual revenue growth of 7.8%, warranting assessment of whether the recent 80.8% gain has created a valuation inflection point.