MAGNITE (MGNI) stock: insider trades, news & valuation
Heavy selling
Close · Oct 9, 2026
$25.40
-0.2% on the day
+36.9% over 12 months
52-week range $11.20 – $25.67
Share price and insider trades
MGNI closeInsider buyInsider sale
Bought, 12 months$0
Sold, 12 months$26.7M
Insiders buying0
Insiders selling13
MAGNITE insider trading at a glance (Oct 9, 2026): in the past 12 months, 0 insiders bought $0 and 13 sold $26.7M of MGNI stock on the open market.
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MGNI insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | — | 0 | — | 0 |
| Q3 2026 | — | 0 | $17.6M | 32 |
| Q2 2026 | — | 0 | $8.0M | 12 |
| Q1 2026 | — | 0 | $258K | 1 |
| Q4 2025 | — | 0 | $796K | 6 |
Valuation, profit and volume
P/E (trailing)n/aSector median —
Market value—
Profit margin—Revenue growth —
Volume vs. 50-day0.7×Last 5 sessions
Insiders' paper profit—On all tracked purchases —
Summary
Over the past 12 months, 0 MAGNITE, INC. insiders reported open-market purchases totaling $0, while 13 insiders reported sales totaling $26.7M. 46 of 51 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| Sep 18SEC | Douglas S KnopperDirector | Sell Plan | 37,33751,136 held (−42%) | $26.28 | $981K | -3.3% | — |
| Sep 18SEC | Paul CaineDirector | Sell Plan | 7,500137,401 held (−5%) | $26.50 | $199K | -4.2% | — |
| Sep 16SEC | Robert F SpillaneDirector | Sell | 10,36357,715 held (−15%) | $23.76 | $246K | +6.9% | — |
| Sep 16SEC | David BuonaseraCTO | Sell Plan | 1,165245,155 held (−0%) | $24.00 | $28K | +5.8% | — |
| Sep 11SEC | Aaron SaltzGeneral Counsel | Sell Plan | 40,000224,389 held (−15%) | $23.41 | $936K | +8.5% | — |
| Sep 11SEC | Katie Seitz EvansSee Remarks | Sell Plan | 13,997441,800 held (−3%) | $24.00 | $336K | +5.8% | — |
| Sep 11SEC | Paul CaineDirector | Sell Plan | 5,000144,901 held (−3%) | $23.53 | $118K | +7.9% | — |
| Sep 10SEC | Katie Seitz EvansSee Remarks | Sell Plan | 32,285466,897 held (−6%) | $23.63 | $763K | +7.5% | — |
| Sep 10SEC | Katie Seitz EvansSee Remarks | Sell Plan | 11,100455,797 held (−2%) | $23.46 | $260K | +8.3% | — |
| Sep 3SEC | David BuonaseraCTO | Sell Plan | 5,371247,363 held (−2%) | $23.42 | $126K | +8.5% | — |
| Sep 3SEC | David BuonaseraCTO | Sell Plan | 1,043246,320 held (−0%) | $25.00 | $26K | +1.6% | — |
| Aug 28SEC | Sarah Patricia HardenDirector | Sell Plan | 30,550133,187 held (−19%) | $23.31 | $712K | +9.0% | — |
| Aug 28SEC | Sarah Patricia HardenDirector | Sell Plan | 18,436114,751 held (−14%) | $24.00 | $442K | +5.8% | — |
| Aug 18SEC | Sean Patrick BuckleySee Remarks | Sell Plan | 8,271295,819 held (−3%) | $24.31 | $201K | +4.5% | — |
| Aug 18SEC | Paul CaineDirector | Sell Plan | 7,500149,901 held (−5%) | $25.00 | $188K | +1.6% | — |
| Aug 18SEC | Sean Patrick BuckleySee Remarks | Sell Plan | 2,759293,060 held (−1%) | $25.00 | $69K | +1.6% | — |
| Aug 12SEC | Brian GephartChief Accounting Officer | Sell | 12,479106,117 held (−11%) | $24.68 | $308K | +2.9% | — |
| Aug 12SEC | Rachel LamDirector | Sell | 10,000230,620 held (−4%) | $24.16 | $242K | +5.1% | — |
| Aug 12SEC | Paul CaineDirector | Sell Plan | 5,000157,401 held (−3%) | $24.35 | $122K | +4.3% | — |
| Aug 7SEC | Michael G. BarrettCEO | Sell Plan | 293,968403,074 held (−42%) | $22.72 | $6.7M | +11.8% | — |
| Aug 7SEC | Sean Patrick BuckleySee Remarks | Sell Plan | 47,942335,042 held (−13%) | $25.09 | $1.2M | +1.2% | — |
| Aug 7SEC | Douglas S KnopperDirector | Sell Plan | 37,33788,473 held (−30%) | $22.72 | $848K | +11.8% | — |
| Aug 7SEC | Katie Seitz EvansSee Remarks | Sell Plan | 20,000496,840 held (−4%) | $24.00 | $480K | +5.8% | — |
| Aug 7SEC | Sean Patrick BuckleySee Remarks | Sell Plan | 19,237315,805 held (−6%) | $23.00 | $442K | +10.4% | — |
| Aug 7SEC | David BuonaseraCTO | Sell Plan | 4,176264,309 held (−2%) | $22.81 | $95K | +11.4% | — |
| Aug 7SEC | David BuonaseraCTO | Sell Plan | 2,602261,707 held (−1%) | $24.00 | $62K | +5.8% | — |
| Aug 7SEC | David BuonaseraCTO | Sell Plan | 871260,836 held (−0%) | $25.00 | $22K | +1.6% | — |
| Jul 17SEC | Michael G. BarrettCEO | Sell Plan | 38,596403,074 held (−9%) | $20.35 | $785K | +24.8% | — |
| Jul 14SEC | Paul CaineDirector | Sell Plan | 5,000162,401 held (−3%) | $20.64 | $103K | +23.1% | — |
| Jul 9SEC | Sean Patrick BuckleySee Remarks | Sell Plan | 19,233354,281 held (−5%) | $21.03 | $404K | +20.8% | — |
| Jul 9SEC | David BuonaseraCTO | Sell Plan | 1,224268,485 held (−0%) | $21.00 | $26K | +21.0% | — |
| Jul 2SEC | David BuonaseraCTO | Sell Plan | 9,376269,709 held (−3%) | $20.00 | $188K | +27.0% | — |
| Jul 1SEC | Michael G. BarrettCEO | Sell Plan | 75,000403,074 held (−16%) | $19.50 | $1.5M | +30.3% | — |
| Jun 18SEC | Sean Patrick BuckleySee Remarks | Sell Plan | 19,233373,514 held (−5%) | $19.00 | $365K | +33.7% | — |
| Jun 17SEC | Michael G. BarrettCEO | Sell Plan | 178,596403,074 held (−31%) | $16.59 | $3.0M | +53.1% | — |
| Jun 17SEC | Michael G. BarrettCEO | Sell Plan | 100,000403,074 held (−20%) | $17.50 | $1.8M | +45.1% | — |
| Jun 17SEC | Douglas S KnopperDirector | Sell Plan | 37,337125,810 held (−23%) | $18.10 | $676K | +40.3% | — |
| Jun 17SEC | David BuonaseraCTO | Sell Plan | 11,233280,494 held (−4%) | $18.00 | $202K | +41.1% | — |
| Jun 17SEC | David BuonaseraCTO | Sell Plan | 1,409279,085 held (−1%) | $19.00 | $27K | +33.7% | — |
| Jun 17SEC | David BuonaseraCTO | Sell Plan | 1,057291,727 held (−0%) | $17.00 | $18K | +49.4% | — |
| Jun 10SEC | Douglas S KnopperDirector | Sell Plan | 10,766163,147 held (−6%) | $15.73 | $169K | +61.5% | — |
| Jun 10SEC | David T. PearsonDirector | Sell Plan | 10,76679,001 held (−12%) | $15.65 | $168K | +62.3% | — |
| Jun 3SEC | David BuonaseraCTO | Sell Plan | 1,409292,784 held (−0%) | $15.00 | $21K | +69.3% | — |
| May 21SEC | Robert F SpillaneDirector | Sell | 10,00043,917 held (−19%) | $13.33 | $133K | +90.5% | — |
| Feb 18SEC | Adam Lee SorocaChief Product Officer | Sell Plan | 21,529388,425 held (−5%) | $12.00 | $258K | +111.7% | — |
| Dec 19SEC | Adam Lee SorocaChief Product Officer | Sell Plan | 16,656326,114 held (−5%) | $17.00 | $283K | +49.4% | — |
| Nov 26SEC | Sean Patrick BuckleyPresident | Sell Plan | 2,213268,912 held (−1%) | $14.50 | $32K | +75.2% | — |
| Nov 21SEC | Robert F SpillaneDirector | Sell | 12,50053,917 held (−19%) | $14.22 | $178K | +78.6% | — |
| Nov 18SEC | Adam Lee SorocaChief Product Officer | Sell Plan | 10,857326,114 held (−3%) | $13.23 | $144K | +92.0% | — |
| Nov 18SEC | Sean Patrick BuckleyPresident | Sell Plan | 4,426271,125 held (−2%) | $13.36 | $59K | +90.1% | — |
| Oct 28SEC | Paul CaineDirector | Sell Plan | 5,000153,603 held (−3%) | $20.00 | $100K | +27.0% | — |
Insiders at MAGNITE, INC.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Michael G. BarrettCEO | — | $13.6M | Aug 7, 2026 | — |
| Sean Patrick BuckleySee Remarks | — | $2.8M | Aug 18, 2026 | — |
| Douglas S KnopperDirector | — | $2.7M | Sep 18, 2026 | — |
| Katie Seitz EvansSee Remarks | — | $1.8M | Sep 11, 2026 | — |
| Sarah Patricia HardenDirector | — | $1.2M | Aug 28, 2026 | — |
| Aaron SaltzGeneral Counsel | — | $936K | Sep 11, 2026 | — |
| David BuonaseraCTO | — | $841K | Sep 16, 2026 | — |
| Paul CaineDirector | — | $829K | Sep 18, 2026 | — |
| Adam Lee SorocaChief Product Officer | — | $685K | Feb 18, 2026 | — |
| Robert F SpillaneDirector | — | $557K | Sep 16, 2026 | — |
| Brian GephartChief Accounting Officer | — | $308K | Aug 12, 2026 | — |
| Rachel LamDirector | — | $242K | Aug 12, 2026 | — |
| David T. PearsonDirector | — | $168K | Jun 10, 2026 | — |
MGNI stock: common questions
Are MAGNITE, INC. insiders buying MGNI stock?
In the past 12 months, 0 insiders reported open-market purchases of MGNI worth $0.
Are MAGNITE, INC. insiders selling MGNI stock?
13 insiders reported sales worth $26.7M over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is MGNI's 52-week range?
Over the past year MGNI has traded between $11.20 and $25.67. It last closed at $25.40 on Oct 9, 2026.