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CIK 0001595974 · Large accelerated filer

MAGNITE, INC.

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Ticker
MGNI
Exchange
Nasdaq
Industry
Services-Computer Programming, Data Processing, Etc.
FY end
Dec 31
Incorporated
DE
Entity type
operating
EIN
208881738
Phone
212-243-2769
Business address
1250 BROADWAY, 9TH FLOOR, NEW YORK, NY
Former names
RUBICON PROJECT, INC.
Open-market buys, last 90 days
$0
in 0 filings
Open-market sales, last 90 days
$9,462,259
in 21 filings, $6.0M under 10b5-1 plans

Net −$9,462,259. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.

Pace of trading Bought Sold

Who's trading

90 days

  1. Evans Katie Seitz −$2.1M See Remarks sold 17% of stake
  2. Rossman James −$1.4M Director sold 46% of stake
  3. Saltz Aaron −$1.2M CHIEF LEGAL OFFICER sold 19% of stake
  4. Harden Sarah Patricia −$1.2M Director sold 30% of stake
  5. Knopper Douglas S −$981K Director sold 42% of stake

Reading 100 more Form 4s from the SEC; this list fills in as they're read.

Date Insider Transaction Shares Price Value Owned after
2026-02-15 Buckley Sean Patrick President, Revenue Shares withheld for taxes −26,942 $11.70 $315K 402,999
2026-02-15 Saltz Aaron CHIEF LEGAL OFFICER Shares withheld for taxes −12,761 $11.70 $149K 275,643
2026-02-15 Gephart Brian CHIEF ACCOUNTING OFFICER Shares withheld for taxes −6,149 $11.70 $72K 122,385
2026-02-15 Soroca Adam Lee CHIEF PRODUCT OFFICER Shares withheld for taxes 10b5-1 −18,933 $11.70 $222K 409,954
2026-02-15 Evans Katie Seitz President, Operations Shares withheld for taxes −27,428 $11.70 $321K 508,044
2026-02-15 Day David CHIEF FINANCIAL OFFICER Shares withheld for taxes −30,617 $11.70 $358K 507,459
2026-02-15 BARRETT MICHAEL G. CEO Shares withheld for taxes −23,549 $11.70 $276K 412,162
2026-01-09 Buonasera David CHIEF TECHNOLOGY OFFICER Option exercise +22,935 331,562
2026-01-09 Buonasera David CHIEF TECHNOLOGY OFFICER Shares withheld for taxes −12,330 $16.17 $199K 319,232
2026-01-09 Buonasera David CHIEF TECHNOLOGY OFFICER Option exercise · Performance Stock Units −22,935 0
2026-01-09 Buckley Sean Patrick President, Revenue Option exercise +64,125 460,310
2026-01-09 Buckley Sean Patrick President, Revenue Shares withheld for taxes −30,369 $16.17 $491K 429,941
2026-01-09 Buckley Sean Patrick President, Revenue Option exercise · Performance Stock Units −64,125 0
2026-01-09 Saltz Aaron CHIEF LEGAL OFFICER Option exercise +28,215 303,430
2026-01-09 Saltz Aaron CHIEF LEGAL OFFICER Shares withheld for taxes −15,026 $16.17 $243K 288,404
2026-01-09 Saltz Aaron CHIEF LEGAL OFFICER Option exercise · Performance Stock Units −28,215 0
2026-01-09 Soroca Adam Lee CHIEF PRODUCT OFFICER Option exercise +51,300 454,217
2026-01-09 Soroca Adam Lee CHIEF PRODUCT OFFICER Shares withheld for taxes −25,330 $16.17 $410K 428,887
2026-01-09 Soroca Adam Lee CHIEF PRODUCT OFFICER Option exercise · Performance Stock Units −51,300 0
2026-01-09 Evans Katie Seitz President, Operations Option exercise +51,300 562,308

Page 6 of 9 · 168 trades