Notice of Proposed Sale · 144
Magnite, Inc.
MGNINASDAQEQUITYCurrent
Notice of Proposed Sale
Structured filing — 144
primary_doc.xml
Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.
Proposed-sale notice
- Issuer
- MAGNITE, INC.
- Issuer CIK
- 0001595974
- SEC file number
- 001-36384
- Phone
- 2122432769
- Person for whose account securities are to be sold
- SEAN BUCKLEY
- Relationships to issuer
- Officer
- Street
- 1250 Broadway, 9th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10001
Securities proposed for sale
| Security | Proposed units | Aggregate market value | Units outstanding | Approximate sale date | Exchange | Broker / market maker |
|---|---|---|---|---|---|---|
| Common | 19,233 | 400,815.72 | 143,215,003 | 07/07/2026 | NASDAQ | Morgan Stanley Smith Barney LLC Executive Financial Services |
Broker / market maker — proposed row 1, entry 1
- Name
- Morgan Stanley Smith Barney LLC Executive Financial Services
- Street
- 1 New York Plaza
- Street (continued)
- 8th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10004
Acquisition of securities to be sold
| Security | Acquired | Nature of acquisition | Acquired from | Amount acquired | Gift transaction | Payment date | Nature of payment |
|---|---|---|---|---|---|---|---|
| Common | 08/15/2023 | Restricted Stock Units | Issuer | 12,482 | N | 08/15/2023 | N/A |
| Common | 01/01/2026 | Performance Stock Awards | Issuer | 6,751 | N | 01/01/2026 | N/A |
Sales reported in the preceding three months
| Seller | Security | Sale date | Amount sold | Gross proceeds |
|---|---|---|---|---|
| 10b5-1 Sales for SEAN BUCKLEY | Common | 06/17/2026 | 19,233 | 365,427.00 |
Seller — prior-sale row 1, entry 1
- Name
- 10b5-1 Sales for SEAN BUCKLEY
- Street
- 1250 Broadway, 9th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10001
Prior-sale reporting
- Nothing to report for the preceding three months
- N
Remarks
The securities to be sold were acquired upon the vesting of restricted stock units during the period of 08/15/2023 through 05/15/2026.
Notice signature
- Notice date
- 07/07/2026
- Signed
- /s/ Sean Buckley
- Plan adoption dates
- 09/10/2025
Company context
We’re Magnite (NASDAQ: MGNI), the world’s largest independent sell-side advertising company. Publishers use our technology to monetize their content across all screens and formats including CTV, online video, display, and audio. The world’s leading agencies and brands trust our platform to access brand-safe, high-quality ad inventory and execute billions of advertising transactions each month. Anchored in bustling New York City, sunny Los Angeles, mile high Denver, historic London, colorful Singapore, and down under in Sydney, Magnite has offices across North America, EMEA, LATAM, and APAC.