Magnite Inc Form 4 Filings

MAGNITE, INC. (MGNI) director Sarah Patricia Harden reported two open-market sales of common stock under a Rule 10b5-1 trading plan adopted on May 27, 2026. She sold 18,436 shares on August 28, 2026 at $24.00 per share and 30,550 shares on August 26, 2026 at a weighted average price of $23.31 per share, with the latter sale executed in multiple trades at prices ranging from $23.09 to $23.52 per share.

MAGNITE, INC. (MGNI) reported that Chief Technology Officer David Buonasera had 8,102 shares of common stock withheld on August 15, 2026 at $24.73 per share. The shares were a non-discretionary forfeiture to cover tax withholding obligations tied to vesting restricted stock units, leaving him with 252,734 shares held directly.

MAGNITE, INC. (MGNI) reported an insider tax-related share disposition by officer Katie Seitz Evans, President, Product & Operations. On 2026-08-15, 11,204 shares of common stock were forfeited on a non-discretionary basis to cover tax withholding obligations tied to vesting restricted stock units. Following this withholding transaction, Evans directly holds 485,636 shares of Magnite common stock.

MAGNITE, INC. (MGNI) reported that Chief Legal Officer Aaron Salt had 5,627 shares of common stock withheld on 2026-08-15 at $24.73 per share. The shares were non-discretionarily forfeited to cover tax withholding obligations arising from the vesting of restricted stock units, pursuant to an arrangement mandated by the company. After this tax-withholding disposition, Salt directly holds 264,389 shares of MAGNITE common stock.

MAGNITE, INC. (MGNI) disclosed that Chief Accounting Officer Brian Gephart had 3,789 shares of common stock withheld on 2026-08-15 under a non-discretionary arrangement mandated by the company to cover tax withholding obligations arising from the vesting of restricted stock units. The shares were valued at $24.73 per share for this purpose, and Gephart now holds 102,328 shares of Magnite common stock directly.

MAGNITE, INC. (MGNI) reported that CEO and director Michael G. Barrett had 10,404 shares of common stock withheld on 2026-08-15 at $24.73 per share. According to the company’s arrangement, these shares were non-discretionarily forfeited to cover tax withholding obligations on vesting restricted stock units, leaving Barrett with 392,670 directly held shares afterward.

MAGNITE, INC. (MGNI) reported an insider equity-related transaction by its Chief Financial Officer, David Day. On 2026-08-15, 14,170 shares of common stock were forfeited at $24.73 per share to satisfy tax withholding obligations tied to the vesting of restricted stock units, under a non-discretionary arrangement mandated by the company. After this tax-withholding disposition, Day directly holds 452,861 shares of MAGNITE common stock.

MAGNITE, INC. (MGNI) director Paul Caine reported selling 7,500 shares of common stock on August 14, 2026, at $25.00 per share in an open-market or private transaction. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted on August 20, 2025, and Caine now directly holds 149,901 shares.

MAGNITE, INC. (MGNI) reported insider transactions by Sean Patrick Buckley, President, Revenue & Market Strategy. On August 18, 2026, he sold 2,759 shares of common stock at $25.00 per share, and on August 17, 2026, he sold 8,271 shares at a weighted average price of $24.31 per share. On August 15, 2026, 11,715 shares were disposed of to satisfy tax withholding obligations related to vesting of restricted stock units. The sales on August 17 and 18 were effected pursuant to a Rule 10b5-1 trading plan adopted on September 10, 2025.

MAGNITE, INC. chief financial officer David Day reported a bona fide gift of 26,258 shares of Common Stock on August 13, 2026. The gift was recorded at $0.00 per share. Following this disposition, Day directly holds 467,031 shares of Common Stock. The transaction was not marked as being made under a Rule 10b5-1 trading plan.

Magnite, Inc. officer Brian Gephart, the Chief Accounting Officer, reported a sale of common stock. On 2026-08-10, he sold 12,479 shares of Magnite common stock in an open market or private transaction at a weighted average price of $24.68 per share, with actual prices ranging from $24.68 to $24.71. Following this transaction, he directly holds 106,117 shares of Magnite common stock.

MAGNITE, INC. director Rachel Lam reported a sale of 10,000 shares of common stock on 2026-08-10 in a non-derivative transaction. The sale was executed at a weighted average price of $24.16 per share, with individual trades ranging from $24.11 to $24.20. Following this sale, Lam directly holds 230,620 shares of MAGNITE common stock.

MAGNITE, INC. director Paul Caine reported selling 5,000 shares of common stock on August 10, 2026 in an open-market transaction. The sale was executed under a Rule 10b5-1 trading plan adopted on August 20, 2025. The weighted average sale price was $24.35 per share, with individual trades executed between $24.07 and $24.91. Following this transaction, Caine directly holds 157,401 shares of MAGNITE common stock.

MAGNITE, INC. executive Sean Patrick Buckley, President, Revenue & Market Strategy, exercised 28,703 stock options at $13.90 per share on August 6, 2026, acquiring the same number of common shares, then sold 67,179 shares at prices from $23.00 to $25.09. Following the exercise, 57,405 stock options remain outstanding and are fully vested and immediately exercisable. All reported transactions were effected under a Rule 10b5-1 trading plan adopted on September 10, 2025.

MAGNITE, INC. director Douglas S. Knopper sold 37,337 shares of common stock on August 6, 2026 at $22.72 per share. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 12, 2025, and he now directly owns 88,473 shares.

MAGNITE, INC. Chief Technology Officer David Buonasera reported selling 7,649 shares of common stock on August 6, 2026 in three open-market transactions under a Rule 10b5-1 trading plan adopted on September 11, 2025. Sale prices ranged from $22.72 to $25.00 per share.

Magnite, Inc. executive Katie Seitz Evans, President, Product & Operations, exercised employee stock options for 20,000 shares of common stock at an exercise price of $5.1600 per share on August 6, 2026, then sold 20,000 shares at $24.0000 per share. The options were fully vested, granted as compensation, and the exercise and sale were made under a Rule 10b5-1 trading plan adopted on August 28, 2025.

Magnite, Inc. CEO Michael G. Barrett exercised stock options covering 293,968 shares of common stock at an exercise price of $5.80 per share and sold the same number of shares at $22.72 per share on August 6, 2026. The options were granted as compensation, were fully vested and immediately exercisable, and were due to expire on March 17, 2027. The exercise and subsequent sale were carried out under a Rule 10b5-1 trading plan adopted on March 13, 2026.

Magnite CEO Michael G. Barrett exercised employee stock options for 38,596 shares at $5.80 per share and sold 38,596 common shares at a weighted average price of $20.35 on July 15, 2026 under a Rule 10b5-1 plan adopted March 13, 2026. After these trades, he holds 403,074 common shares and 293,968 remaining stock options expiring March 17, 2027.

Magnite, Inc. director Paul Caine reported an open-market sale of 5,000 shares of common stock on July 10, 2026 at a weighted average price of $20.64 per share, with individual trades between $20.31 and $21.25. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on August 20, 2025, and Caine now directly owns 162,401 shares of Magnite common stock.

Magnite, Inc. Chief Technology Officer David Buonasera reported an open-market sale of 1,224 shares of Common Stock at $21.00 per share. After this transaction, he directly holds 268,485 shares.

The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on September 11, 2025, indicating it was scheduled in advance rather than timed opportunistically.

MAGNITE, INC. officer Sean Patrick Buckley reported an open-market sale of 19,233 shares of common stock on July 7, 2026. The shares were sold at a weighted average price of $21.03 per share, in multiple trades between $21.00 and $21.16.

After this transaction, Buckley directly holds 354,281 shares of Magnite common stock. The sale was carried out under a pre-arranged Rule 10b5-1 trading plan that Buckley adopted on September 10, 2025, indicating the trades were scheduled in advance.

MAGNITE, INC. Chief Technology Officer David Buonasera sold 9,376 shares of Common Stock in an open-market transaction at $20.00 per share. After the sale, he directly holds 269,709 shares. The transaction was carried out under a pre-arranged Rule 10b5-1 trading plan adopted on September 11, 2025.

MAGNITE, INC. CEO Michael G. Barrett reported an option exercise and related share sale in Common Stock. He exercised options for 75,000 shares at $5.80 per share and sold 75,000 shares in an open-market transaction at $19.50 per share.

Following these transactions, Barrett holds 403,074 shares of Common Stock directly. The exercise and subsequent sale were carried out under a pre-arranged Rule 10b5-1 trading plan, indicating the trades were scheduled in advance as part of a structured liquidity plan.

Magnite, Inc. officer Sean Patrick Buckley reported an open-market sale of 19,233 shares of Common Stock at $19.00 per share. After this transaction, he directly holds 373,514 shares, indicating he retains a substantial equity position. The filing notes the sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on September 10, 2025, suggesting the trade was scheduled in advance rather than timed opportunistically.

MAGNITE, INC. director Douglas S. Knopper reported an open-market sale of 37,337 shares of common stock on June 16, 2026 at a weighted average price of $18.10 per share, with individual trade prices ranging from $18.00 to $18.25.

The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 12, 2025. Following this sale, Knopper directly holds 125,810 shares of Magnite common stock.

MAGNITE, INC. Chief Technology Officer David Buonasera reported open-market sales of company Common Stock over three consecutive days. He sold 1,057 shares at $17.00, 11,233 shares at $18.00, and 1,409 shares at $19.00, totaling 13,699 shares.

Following these transactions, Buonasera directly holds 279,085 shares of Magnite common stock. The filing notes that the reported transactions were executed under a pre-arranged Rule 10b5-1 trading plan adopted on September 11, 2025, indicating they were scheduled in advance rather than timed discretionarily.

Magnite, Inc. CEO Michael G. Barrett exercised stock options and sold shares in paired transactions disclosed on this Form 4. On June 15, 2026, he exercised options to acquire 178,596 shares of common stock at a $5.80 exercise price and sold 178,596 shares in open‑market transactions at a weighted average price of $16.59, with individual trades ranging from $15.945 to $16.93. On June 16, 2026, he exercised options to acquire an additional 100,000 shares at $5.80 and sold 100,000 shares at $17.50 per share. The filing reports that these exercises and subsequent sales were made pursuant to a pre‑arranged Rule 10b5‑1 trading plan adopted on March 13, 2026. Following the transactions, Barrett directly holds 403,074 shares of Magnite common stock, with the reported options fully vested and immediately exercisable before their stated expiration date of March 17, 2027.

Caine Paul reported acquisition or exercise transactions in this Form 4 filing.

MAGNITE, INC. director Paul Caine received a grant of 13,798 shares of common stock in the form of restricted stock units as compensation for services. These units vest in full on the earliest of June 8, 2027, the 2027 annual stockholders’ meeting, or a change of control of the company. After this award, Caine holds 167,401 shares of common stock directly.

MAGNITE, INC. director Diane Yu received an equity award of 13,798 shares of common stock in the form of restricted stock units as compensation for services. The award was granted at a price of $0.00 per share and increases her direct holdings to 81,279 shares.

The restricted stock units vest in full on the earliest of June 8, 2027, the date of Magnite’s 2027 annual stockholder meeting, or a change of control of the company. This filing reflects a routine, compensation-related acquisition rather than an open-market purchase or sale.

Spillane Robert F reported acquisition or exercise transactions in this Form 4 filing.

MAGNITE, INC. director Robert F. Spillane reported an award of 13,798 shares of Common Stock in the form of restricted stock units granted as compensation for services. These units vest in full on the earliest of June 8, 2027, the company’s 2027 annual stockholders’ meeting, or a change of control of the company. Following this award, Spillane directly holds 57,715 shares of Common Stock.

Harden Sarah Patricia reported acquisition or exercise transactions in this Form 4 filing.

Magnite, Inc. director Sarah Patricia Harden received a grant of 13,798 shares of common stock in the form of restricted stock units as compensation for services. These units vest in full on the earliest of June 8, 2027, the 2027 annual stockholders’ meeting, or a change of control. After this award, she directly holds 163,737 shares of Magnite common stock.

MAGNITE, INC. director Douglas S. Knopper reported both an equity award and a share sale. On June 8, 2026, he received 13,798 shares of Common Stock as a grant at $0.00 per share, representing restricted stock units that vest in full on the earliest of June 8, 2027, the 2027 annual stockholder meeting date, or a change of control. On June 10, 2026, he sold 10,766 Common Stock shares in an open-market transaction at a weighted average price of $15.73 per share under a Rule 10b5-1 trading plan adopted on December 12, 2025, with individual trade prices ranging from $15.29 to $15.90. Following these transactions, he directly holds 163,147 Common Stock shares.

Rossman James reported acquisition or exercise transactions in this Form 4 filing.

MAGNITE, INC. director James Rossman received a grant of 13,798 shares of common stock in the form of restricted stock units as compensation for services. These units were awarded at no cash cost to him and increase his direct holdings to 107,477 shares after the transaction.

The restricted stock units vest in full on the earliest of June 8, 2027, the date of Magnite’s 2027 annual stockholders’ meeting, or a change of control of the company. Until vesting, the award remains subject to these time- and event-based conditions.

MAGNITE, INC. director Rachel Lam received a grant of 13,798 shares of common stock in the form of restricted stock units as compensation for services. These units vest in full on the earliest of June 8, 2027, the 2027 annual stockholder meeting date, or a change of control of the company.

Following this award, Lam directly owns 240,620 shares of common stock. The transaction is classified as a grant or award acquisition rather than an open-market purchase or sale.

MAGNITE, INC. director David T. Pearson reported both an equity award and a share sale. He received 13,798 restricted stock units as compensation, which vest in full on the earliest of June 8, 2027, the 2027 annual stockholder meeting, or a change of control.

On June 10, 2026, he sold 10,766 shares of Common Stock in open-market transactions at a weighted average price of $15.65 per share, under a pre-arranged Rule 10b5-1 trading plan. Following these transactions, he directly owns 79,001 shares of Magnite common stock.

Magnite, Inc.'s Chief Technology Officer David Buonasera reported an open-market sale of 1,409 shares of Common Stock at $15.00 per share. After this transaction, he directly holds 292,784 shares. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on September 11, 2025.

MAGNITE, INC. director Robert F. Spillane reported an open-market sale of 10,000 shares of common stock on May 19, 2026 at a weighted average price of $13.33 per share. After this transaction, he directly owns 43,917 common shares.

The filing notes that the shares were sold in multiple trades at prices ranging from $13.32 to $13.355 per share, with full trade-by-trade details available upon request to the company, its security holders, or the SEC staff.

MAGNITE, INC. CEO Michael G. Barrett reported a routine tax-related share forfeiture. On May 15, 2026, 10,404 shares of common stock were disposed of at an indicated value of $12.82 per share to satisfy tax withholding obligations tied to vesting restricted stock units.

The filing notes this was a non-discretionary forfeiture mandated by the company’s arrangement, not an open-market sale. After this transaction, Barrett directly holds 403,074 shares of Magnite common stock, which includes 1,316 shares acquired the same day under the company’s Employee Stock Purchase Plan.

MAGNITE, INC. President, Revenue Sean Patrick Buckley reported a routine share disposition related to tax withholding. On the vesting of restricted stock units, 12,019 shares of common stock were forfeited at a value of $12.82 per share to satisfy tax obligations under a mandatory arrangement. After this non-discretionary forfeiture, Buckley directly holds 392,747 shares, which include 1,767 shares acquired on May 15, 2026 under the company’s Employee Stock Purchase Plan.

Magnite, Inc. President of Operations Katie Seitz Evans reported a routine tax-related share disposition. On May 15, 2026, 11,204 shares of common stock were forfeited at $12.82 per share to cover tax withholding obligations tied to vesting restricted stock units. After this non-discretionary forfeiture, she directly holds 496,840 shares of Magnite common stock.

Magnite, Inc.’s chief financial officer David Day reported a routine share disposition tied to taxes, not an open-market trade. On the vesting of restricted stock units, 14,170 shares of common stock were automatically forfeited at a value of $12.82 per share to cover tax withholding obligations mandated by the company. After this non-discretionary tax-withholding event, Day directly holds 493,289 shares of Magnite common stock.

MAGNITE, INC. chief accounting officer Brian Gephart reported a routine share disposition tied to taxes. On the vesting of restricted stock units, 3,789 shares of common stock were forfeited at an indicated value of $12.82 per share to cover mandated tax withholding obligations. This non-discretionary forfeiture was executed under an arrangement required by the company, rather than as an open-market sale. Following the transaction, Gephart directly holds 118,596 shares of Magnite common stock.

Magnite, Inc.’s chief legal officer, Aaron Saltz, reported a non-discretionary forfeiture of 5,627 shares of common stock on May 15, 2026. These shares were withheld at $12.82 per share to cover tax obligations tied to vesting restricted stock units. After this tax-withholding disposition, he directly holds 270,016 shares of Magnite common stock.

Magnite, Inc. chief technology officer David Buonasera had 8,335 common shares withheld at $12.82 per share to cover tax obligations from vesting restricted stock units. After this non-discretionary forfeiture, he directly holds 294,193 shares, which include 433 shares acquired under the company’s Employee Stock Purchase Plan.

Magnite chief product officer Adam Lee Soroca reported selling 21,529 shares of common stock at $12.00 per share in an open‑market transaction. An additional 18,933 shares at $11.70 per share were disposed of to satisfy tax withholding tied to restricted stock unit vesting. After these transactions, he directly held 388,425 shares of Magnite common stock. The open‑market sale was executed under a Rule 10b5‑1 trading plan adopted by Soroca on August 18, 2025.

Magnite, Inc.’s Chief Technology Officer David Buonasera reported a non-discretionary share forfeiture related to equity compensation. On February 15, 2026, 17,137 shares of common stock were surrendered at $11.70 per share to cover tax withholding obligations from vesting restricted stock units. This was a mandated arrangement by the company, not an open-market sale. After this tax-withholding disposition, Buonasera beneficially owned 302,095 shares of Magnite common stock.

Magnite, Inc. CEO Michael G. Barrett reported a tax-related share disposition. On the vesting of restricted stock units, 23,549 shares of common stock were non-discretionarily forfeited at $11.70 per share to cover withholding taxes. After this tax-withholding transaction, he directly holds 412,162 common shares.

Magnite, Inc. Chief Accounting Officer Brian Gephart reported a tax-related share transaction involving company common stock. On the reported date, 6,149 shares were forfeited at $11.70 per share to satisfy withholding taxes tied to the vesting of restricted stock units, under a non-discretionary arrangement mandated by Magnite. Following this tax-withholding disposition, Gephart’s directly held stake stands at 122,385 common shares.