undamentalytics Newsletter

Magnite, Inc. insider trading

Every open-market purchase and sale by Magnite, Inc.'s officers, directors and largest shareholders since November 4, 2021, and what the share price did next.

No insider has bought shares on the open market in five years.

Insider purchase Insider sale Marker size reflects trade value. Weekly closes adjusted for splits; may be delayed.
Magnite, Inc. insider open-market trades
DateInsiderTrade SharesPriceValue 1M after 3M after 6M after

From insiders' Form 4 filings with the SEC: open-market purchases and sales only (awards, option exercises and shares withheld for tax are excluded), combined to one line per insider per day. "Plan" marks trades the filing says were made under a pre-set Rule 10b5-1 trading plan, which are scheduled in advance. Price changes run from the close on the trade date; hover a figure for the change relative to the S&P 500. Past moves don't predict future ones.

Does following Magnite, Inc.’s insiders pay?

From April 9, 2014 to September 16, 2026, 24 insiders reported 4 open-market purchases and 98 sales not made under a pre-set plan in Magnite, Inc. Twelve months after each purchase was reported, the shares were −14.5% against the S&P 500 on average (median −18.1%), over 3 purchases with a full year of prices; 0% beat the index. After sales, the shares moved +18.4% against the index over 12 months (a negative figure means selling was the right call). That rests on fewer than 20 purchases, too few to read much into. Buying each purchase the day after it was reported, an equal amount each, held 12 months or until that insider reported a sale, would have turned $10,000 on December 9, 2021 into $7,705 by November 2, 2026, −5.2% a year. It held shares 29% of the time; the S&P 500 on those same days, with Treasury bills otherwise, made $10,639 (+1.3% a year), and held throughout $17,343 (+12.0%).

$0$5.0k$10.0k$15.0k 202120222023202420252026 $17.3k$10.6k$7.7k
Copying Magnite, Inc.'s insidersS&P 500, same days investedS&P 500, held throughout $10,000 copying every open-market purchase by Magnite, Inc.'s insiders from December 9, 2021, before costs and taxes, marked weekly. Uninvested money earns the Treasury bill rate; the portfolio held shares 29% of the time.
Magnite, Inc.: each insider's record
InsiderRolePurchases12 months after their purchasesBeat the S&P 500Sales12 months after their salesLatest report
Saltz Aaron CHIEF LEGAL OFFICER 0 — — 11 −25.0% (11) August 29, 2025
Barrett Michael G. CEO 1 — — 8 +49.3% (8) August 20, 2025
Evans Katie Seitz President, Operations 0 — — 9 −37.4% (9) August 29, 2025
Day David CHIEF FINANCIAL OFFICER 0 — — 8 +44.1% (8) August 20, 2025
Soroca Adam Lee Chief Product Officer 0 — — 8 +43.7% (8) August 18, 2023
Kershaw Thomas Chief Technology Officer 0 — — 7 +58.6% (7) May 19, 2021
Spillane Robert F Director 0 — — 7 +6.9% (4) September 16, 2026
Buonasera David CHIEF TECHNOLOGY OFFICER 0 — — 5 +0.3% (5) August 20, 2025
Gephart Brian CHIEF ACCOUNTING OFFICER 0 — — 5 −27.6% (4) August 12, 2026
Lam Rachel Director 3 −14.5% (3) 0% 2 −17.1% (1) August 12, 2026
Prusz Joseph R Chief Revenue Officer, DV+ 0 — — 5 +65.8% (5) August 18, 2021
Buckley Sean Patrick President, Revenue 0 — — 4 −9.9% (4) September 10, 2025
Tuller Blima Chief Accounting Officer 0 — — 4 +108.3% (4) May 20, 2020
Filip Eve See remarks 0 — — 3 +149.6% (3) May 20, 2020
Feldman Jonathan Co-General Counsel & Secretary 0 — — 2 +23.8% (2) November 19, 2019
Hughes Shawna Chief Accounting Officer 0 — — 2 −23.4% (2) May 19, 2021
Addante Frank See remarks 0 — — 1 −15.2% (1) May 15, 2015
Chaddha Navin 10% owner 0 — — 1 −3.7% (1) March 4, 2015
Mayfield Associates Fund Xii 10% owner 0 — — 1 −4.5% (1) March 2, 2015
Mohn Jarl Director 0 — — 1 −31.8% (1) April 11, 2014
News Corp 10% owner 0 — — 1 −33.0% (1) April 9, 2014
Raifman Gregory R President 0 — — 1 −69.6% (1) March 10, 2016
Tappin Todd L CFO & COO 0 — — 1 −69.6% (1) March 10, 2016
Yu Diane Director 0 — — 1 −30.9% (1) August 27, 2025

Moves are the shares’ return including dividends minus the S&P 500’s, from the close on the first trading day after each report; the number of trades with a finished 12-month window is in brackets. Green means the trade went the insider’s way (a purchase ahead of the index, a sale followed by the shares trailing it). A trade reported both by a director or officer and by a fund or company they are linked to counts once here, under the person. Purchases count only where the share price actually traded was at least $5. These figures describe what the shares did, not why anyone traded. Insiders across all companies.

When several insiders traded Magnite, Inc.

Months when 2 or more insiders became net buyers, or 3 or more net sellers, of Magnite, Inc. in reports dated in the 91 days before the month end, and how the stock did against the S&P 500 from that month end. After 8 selling crowds, +12.4%. One company's history is too short to judge by; the test across every company is the better guide.

MonthCrowd3 months on, vs S&P 5006 months12 months
September 30, 20263 sellingnot yetnot yetnot yet
June 30, 20253 selling−15.3%−43.8%−38.0%
May 31, 20238 selling−38.4%−39.8%−24.2%
May 28, 20218 selling−7.4%−46.8%−62.2%
November 30, 20206 selling+127.0%+45.6%−34.8%
May 29, 20207 selling+2.9%+182.5%+333.4%
November 29, 20198 selling+35.2%−17.4%+117.7%
May 31, 20197 selling+83.4%+34.8%+6.6%
May 29, 20153 selling−11.6%−16.1%−16.5%

Colours show whether the crowd was right: green when buyers were followed by a rise above the index, or sellers by a fall below it. Total returns from the month end; past patterns are not a forecast.

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