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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
2026-01-09 Evans Katie Seitz President, Operations Shares withheld for taxes −26,836 $16.17 $434K 535,472
2026-01-09 Evans Katie Seitz President, Operations Option exercise · Performance Stock Units −51,300 0
2026-01-09 Day David CHIEF FINANCIAL OFFICER Option exercise +72,675 573,245
2026-01-09 Day David CHIEF FINANCIAL OFFICER Shares withheld for taxes −35,169 $16.17 $569K 538,076
2026-01-09 Day David CHIEF FINANCIAL OFFICER Option exercise · Performance Stock Units −72,675 0
2026-01-09 BARRETT MICHAEL G. CEO Option exercise +213,750 545,453
2026-01-09 BARRETT MICHAEL G. CEO Shares withheld for taxes −109,742 $16.17 $1.8M 435,711
2026-01-09 BARRETT MICHAEL G. CEO Option exercise · Performance Stock Units −213,750 0
2026-01-01 Buonasera David CHIEF TECHNOLOGY OFFICER Grant or award +76,803 308,627
2026-01-01 Buonasera David CHIEF TECHNOLOGY OFFICER Grant or award · Performance Stock Units +25,801 25,801
2026-01-01 Buckley Sean Patrick President, Revenue Grant or award +127,273 396,185
2026-01-01 Buckley Sean Patrick President, Revenue Grant or award · Performance Stock Units +42,757 42,757
2026-01-01 Saltz Aaron CHIEF LEGAL OFFICER Grant or award +65,831 275,215
2026-01-01 Saltz Aaron CHIEF LEGAL OFFICER Grant or award · Performance Stock Units +22,115 22,115
2026-01-01 Gephart Brian CHIEF ACCOUNTING OFFICER Grant or award +39,185 128,534
2026-01-01 Soroca Adam Lee CHIEF PRODUCT OFFICER Grant or award +76,803 402,917
2026-01-01 Soroca Adam Lee CHIEF PRODUCT OFFICER Grant or award · Performance Stock Units +25,801 25,801
2026-01-01 Evans Katie Seitz President, Operations Grant or award +127,273 511,008
2026-01-01 Evans Katie Seitz President, Operations Grant or award · Performance Stock Units +42,757 42,757
2026-01-01 Day David CHIEF FINANCIAL OFFICER Grant or award +131,661 500,570

Page 7 of 9 · 168 trades