MGNI
MAGNITE, INC. · Services · Market cap $3.4B
Insiders sold $17.2M net in the last 90 days ·11 sellers, 0 buyers· 23 of 26 sales under Rule 10b5-1 plans· latest Form 4 filed Oct 14, 2026
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$27.0M
reported sales (SEC code S)
Unique Insiders
13
in the rolling window
Latest filing
Oct 14, 2026
Caine Paul
MAGNITE, INC. (MGNI) has 92 SEC Form 4 filings (125 transaction rows) in the rolling window, disclosed by 13 distinct insiders. Most recent filing: Oct 14, 2026.
Inside the rolling window, 13 insiders at MAGNITE, INC. reported no open-market purchases and 49 open-market sales totaling $27.0M. The most active filer is CHIEF TECHNOLOGY OFFICER Buonasera David with 10 filings. Insiders have net sold $25.9M over the trailing 6 months. The most recent open-market filing is a sale of 12,500 shares by Director Caine Paul, dated Oct 12, 2026, worth $316K.
- Industry:Advertising Agencies
- CEO:Michael G. Barrett
- Employees:971
- HQ:New York City, NY, US
- IPO:2014-04-02
| Source | |||||||
|---|---|---|---|---|---|---|---|
| Director | Sale | 12,500 | $316K | Oct 14 | -1.0% | SEC ↗ | |
| Director | Sale | 37,337 | $981K | Sep 18 | -6.1% | SEC ↗ | |
| Director | Sale | 7,500 | $199K | Sep 18 | -6.1% | SEC ↗ | |
| CHIEF TECHNOLOGY OFFICER | Sale | 1,165 | $28K | Sep 16 | -0.7% | SEC ↗ | |
Spillane Robert FFirst in 4 months | Director | Sale | 10,363 | $246K | Sep 16 | -0.7% | SEC ↗ |
| See Remarks | Sale | 13,997 | $336K | Sep 11 | -0.6% | SEC ↗ | |
Saltz AaronFirst filing | CHIEF LEGAL OFFICER | Sale | 40,000 | $936K | Sep 11 | -0.6% | SEC ↗ |
| Director | Sale | 5,000 | $118K | Sep 11 | -0.6% | SEC ↗ | |
| See Remarks | Sale | 32,285 | $763K | Sep 10 | +0.3% | SEC ↗ | |
| See Remarks | Sale | 11,100 | $260K | Sep 10 | +0.3% | SEC ↗ | |
| CHIEF TECHNOLOGY OFFICER | Sale | 5,371 | $126K | Sep 3 | — | SEC ↗ | |
| CHIEF TECHNOLOGY OFFICER | Sale | 1,043 | $26K | Sep 3 | — | SEC ↗ | |
Harden Sarah PatriciaFirst filing | Director | Sale | 30,550 | $712K | Aug 28 | — | SEC ↗ |
Harden Sarah PatriciaFirst filing | Director | Sale | 18,436 | $442K | Aug 28 | — | SEC ↗ |
| Director | Sale | 7,500 | $188K | Aug 18 | — | SEC ↗ | |
| See Remarks | Sale | 8,271 | $201K | Aug 18 | — | SEC ↗ | |
| See Remarks | Sale | 2,759 | $69K | Aug 18 | — | SEC ↗ | |
Gephart BrianFirst filing | CHIEF ACCOUNTING OFFICER | Sale | 12,479 | $308K | Aug 12 | — | SEC ↗ |
Lam RachelFirst filing | Director | Sale | 10,000 | $242K | Aug 12 | — | SEC ↗ |
| Director | Sale | 5,000 | $122K | Aug 12 | — | SEC ↗ | |
| See Remarks | Sale | 67,179 | $1.6M | Aug 7 | — | SEC ↗ | |
| CEO | Sale | 293,968 | $6.7M | Aug 7 | — | SEC ↗ | |
Evans Katie SeitzFirst filing | See Remarks | Sale | 20,000 | $480K | Aug 7 | — | SEC ↗ |
| Director | Sale | 37,337 | $848K | Aug 7 | — | SEC ↗ | |
| CHIEF TECHNOLOGY OFFICER | Sale | 7,649 | $179K | Aug 7 | — | SEC ↗ |
Frequently asked questions
How many SEC Form 4 insider filings does MGNI have?
MAGNITE, INC. (MGNI) has 92 SEC Form 4 filings (125 transaction rows) in the rolling 365-day window, disclosed by 13 distinct insiders. Most recent filing: Oct 14, 2026.
When was the most recent SEC Form 4 filing for MGNI?
The most recent Form 4 filing for MGNI on Tracefour is dated Oct 14, 2026.
Who is the most active insider at MGNI?
The most active SEC Form 4 filer at MGNI in the rolling window is CHIEF TECHNOLOGY OFFICER Buonasera David, with 10 filings.
What is the net insider flow at MGNI over the last 6 months?
Over the trailing 180 days, insiders at MGNI have net sold $25.9M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at MGNI in the current window?
Inside the rolling window, insiders at MGNI bought $0 and sold $27.0M based on SEC Form 4 filings.
Can I get alerts for MGNI insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at MAGNITE, INC. (MGNI). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
MAGNITE, INC. is in the Services sector.