Welcome to our dedicated page for Magnite SEC filings (Ticker: MGNI), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Magnite, Inc. (NASDAQ: MGNI) files a range of reports and disclosures with the U.S. Securities and Exchange Commission, providing investors with detailed information about its operations as an independent sell-side advertising company. This page aggregates Magnite’s SEC filings and pairs them with AI-powered tools to help readers interpret complex regulatory documents.
Magnite’s recent Form 8-K filings illustrate how the company communicates material events. For example, it has furnished press releases announcing financial results for quarters ended June 30 and September 30, 2025 under Item 2.02, and it has disclosed the filing of a lawsuit against Google LLC under Item 7.01, along with related risk factor updates under Item 8.01. Another 8-K describes a material definitive agreement amending a sublease to expand leased premises.
Through this page, users can quickly access Magnite’s current reports on Form 8-K, as well as its periodic reports such as annual reports on Form 10-K and quarterly reports on Form 10-Q, which are referenced in its forward-looking statements and risk factor discussions. These filings provide insight into Magnite’s financial condition, non-GAAP metrics like Contribution ex-TAC and Adjusted EBITDA as described in its earnings materials, and the risks it associates with its business and litigation.
AI-powered summaries highlight key points from lengthy filings, helping readers understand sections on results of operations, risk factors, material agreements, and legal proceedings without reading every page. Real-time updates ensure that new filings from EDGAR appear promptly, while dedicated views make it easier to review items such as executive commentary in earnings releases or disclosures related to Magnite’s relationship with major partners like Google. This page is a central resource for analyzing MGNI’s regulatory history and ongoing reporting obligations.
MAGNITE, INC. chief legal officer Aaron Salt reported a tax-withholding disposition of 12,761 shares of common stock. These shares were non-discretionarily forfeited to the company at $11.70 per share to cover tax obligations arising from the vesting of restricted stock units, rather than being sold on the open market. After this withholding event, Salt directly holds 275,643 shares of Magnite common stock.
MAGNITE, INC. President, Revenue Sean Patrick Buckley reported a disposition of 26,942 shares of common stock at $11.70 per share. The shares were non-discretionarily forfeited to cover tax withholding obligations tied to vested restricted stock units. After this tax-withholding disposition, Buckley directly held 402,999 common shares.
Capital Research Global Investors filed a Schedule 13G showing a passive ownership stake in Magnite, Inc. common stock. It reports beneficial ownership of 12,920,289 shares, representing 9.0% of the class, based on 143,647,869 shares believed outstanding as of 12/31/2025. Capital Research Global Investors has sole voting and dispositive power over all reported shares and certifies the position is held in the ordinary course of business, not to change or influence control of Magnite.
Wellington Management Group and related entities have disclosed a significant ownership position in Magnite, Inc. common stock. They report beneficial ownership of 8,629,238 shares held across clients of several Wellington investment advisers.
The Wellington entities report no sole voting or dispositive power over these shares, only shared authority. One adviser, Wellington Management Company LLP, reports shared voting power over 5,142,349 shares and shared dispositive power over 7,417,178 shares, reflecting its role managing assets for underlying clients rather than owning the shares directly.
Magnite, Inc.'s chief financial officer David Day reported the vesting of performance-based stock units and related tax withholding. On January 9, 2026, he acquired 72,675 shares of common stock at $0 per share upon the vesting of performance stock units granted under Magnite's Amended and Restated 2014 Equity Incentive Plan. The number of units that vested was based on the company achieving 126.35% of its performance goal over a three-year total stockholder return period relative to the Russell 2000 index.
To cover tax withholding obligations from this vesting, 35,169 shares of common stock were automatically forfeited at a price of $16.17 per share pursuant to an arrangement mandated by the company, rather than an open-market sale decision by the executive. After these transactions, Day directly beneficially owned 538,076 shares of Magnite common stock.
Magnite, Inc. chief product officer Adam Lee Soroca reported the vesting and settlement of performance stock units into common shares. On January 9, 2026, 51,300 performance stock units converted into an equal number of common shares at $0 exercise price under the company’s Amended and Restated 2014 Equity Incentive Plan, following achievement of 126.35% of the target based on a three-year total stockholder return test versus Russell 2000 companies. To cover tax withholding on this vesting, 25,330 common shares were automatically forfeited at a price of $16.17 per share. After these transactions, Soroca directly owned 428,887 shares of Magnite common stock.
Magnite, Inc. chief legal officer Aaron Saltz reported the vesting of performance stock units and related share withholding for taxes. On January 9, 2026, 28,215 performance stock units converted into 28,215 shares of Magnite common stock at an exercise price of $0 under the company’s Amended and Restated 2014 Equity Incentive Plan. The award’s vesting was based on Magnite’s total stockholder return over a three-year period relative to companies in the Russell 2000 index, with performance certified at 126.35% of target. To satisfy tax withholding obligations tied to this vesting, 15,026 shares of common stock were forfeited at a price of $16.17 per share under an issuer‑mandated arrangement. Following these transactions, Saltz directly held 288,404 shares of Magnite common stock.
Magnite, Inc. reported an equity vesting event for its Chief Technology Officer, David Buonasera. On January 9, 2026, 22,935 performance stock units (PSUs) granted under the company’s Amended and Restated 2014 Equity Incentive Plan converted into the same number of common shares at an exercise price of $0.
The PSUs vested based on Magnite’s total stockholder return over a three-year period starting January 1, 2023, compared with companies in the Russell 2000 index. The award could vest from 0% to 150% of the target amount, and the compensation committee determined achievement of 126.35%, resulting in 22,935 shares vesting.
To cover tax withholding obligations tied to this vesting, 12,330 shares of common stock were automatically forfeited at a price of $16.17 per share. After these transactions, Buonasera directly held 319,232 shares of Magnite common stock.
Magnite, Inc. executive Sean Patrick Buckley, President, Revenue, reported the vesting of performance-based equity and related tax share withholding. On January 9, 2026, 64,125 performance stock units were converted into an equal number of shares of Magnite common stock at an exercise price of $0 under the company’s Amended and Restated 2014 Equity Incentive Plan. The award’s vesting was based on Magnite’s total stockholder return over a three-year period starting January 1, 2023, relative to Russell 2000 companies, with achievement determined at 126.35%, resulting in the 64,125 vested shares. To cover tax withholding tied to this vesting, 30,369 shares of common stock were forfeited at a price of $16.17 per share. Following these transactions, Buckley directly holds 429,941 shares of Magnite common stock.
Magnite, Inc. President, Operations Katie Seitz Evans reported performance-based stock vesting and related tax share withholding. On January 9, 2026, 51,300 performance stock units converted into 51,300 shares of common stock at $0 under the company’s Amended and Restated 2014 Equity Incentive Plan, based on 126.35% total shareholder return achievement over a three-year period versus the Russell 2000 index. To cover tax withholding on this vesting, 26,836 shares of common stock were automatically forfeited at $16.17 per share under an issuer-mandated arrangement. After these transactions, Evans directly held 535,472 shares of Magnite common stock.