MAGNITE, INC. (MGNI)
Data as of , from SEC Form 4 filings.
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- Paul Caine - DirectorOpen-market sale$199K
Douglas S. Knopper
About MAGNITE, INC. (MGNI)
Magnite is a supply-side advertising platform that provides technology and yield management solutions to content publishers, enabling them to monetize their digital advertising inventory. Magnite receives a percentage of all advertising inventory that it sells. 43% of Magnite's revenue is derived from connected television, or CTV, streaming platforms, 40% from mobile applications, and the remainder from general websites. Beyond the typical monetization responsibilities inherent to an SSP, Magnite also provides upstream advertising servers to CTV publishers, allowing them to have granular control over direct-sold, programmatic guaranteed, and open-auction logic. Magnite competes with other independent SSPs, supply path optimization solutions, and closed ecosystems like Meta.
- NEW YORK, NY
- 971
- 2014
- XNAS
MGNI Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 28 | 724,885 | $16.92M |
| Grant or award | 2 | 89,323 | |
| Option exercise | 12 | 810,352 | |
MGNI insider transactions (Form 4)
50142 Form 4 filings on record, the earliest from Nov 8, 2024, newest first. Filing history page 1 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Haas Sullivan - Officer | Grant or award | Common Stock | 24,641 footnote F1 | $0.00 footnote F2 | - | |
| ||||||
| Brian Gephart - Officer | Grant or award | Common Stock | 64,682 footnote F1 | $0.00 footnote F2 | - | |
| ||||||
| Paul Caine - Director | Open-market sale | Common Stock | 7,500 | $26.50 | $199K | |
| Douglas S. Knopper - Director | Open-market sale | Common Stock | 37,337 | $26.28 footnote F2 | $981K | |
| ||||||
| David Buonasera - Officer | Open-market sale | Common Stock | 1,165 | $24.00 | $28K | |
| Robert F. Spillane - Director | Option exercise | Common Stock | 10,363 | $5.17 | $54K | |
| Robert F. Spillane - Director | Open-market sale | Common Stock | 10,363 | $23.76 footnote F1 | $246K | |
| Robert F. Spillane - Director | Option exercise | Stock Option (right to buy) | 10,363 | $0.00 footnote F3 | - | |
| ||||||
| Katie Seitz Evans - Officer | Open-market sale | Common Stock | 13,997 | $24.00 | $336K | |
| Aaron Saltz - Officer | Open-market sale | Common Stock | 40,000 | $23.41 footnote F2 | $936K | |
| ||||||
| Paul Caine - Director | Open-market sale | Common Stock | 5,000 | $23.53 footnote F2 | $118K | |
| ||||||
| Katie Seitz Evans - Officer | Option exercise | Common Stock | 13,546 | $5.16 | $70K | |
| Katie Seitz Evans - Officer | Open-market sale | Common Stock | 32,285 | $23.63 footnote F2 | $763K | |
| Katie Seitz Evans - Officer | Open-market sale | Common Stock | 11,100 | $23.46 footnote F3 | $260K | |
| Katie Seitz Evans - Officer | Option exercise | Employee Stock Option (Right to Buy) | 13,546 | $0.00 footnote F5 | - | |
| ||||||
| David Buonasera - Officer | Open-market sale | Common Stock | 5,371 | $23.42 | $126K | |
| David Buonasera - Officer | Open-market sale | Common Stock | 1,043 | $25.00 | $26K | |
| Sarah Patricia Harden - Director | Open-market sale | Common Stock | 30,550 | $23.31 footnote F2 | $712K | |
| Sarah Patricia Harden - Director | Open-market sale | Common Stock | 18,436 | $24.00 | $442K | |
| ||||||
| David Buonasera - Officer | Tax withholding / forfeiture | Common Stock | 8,102 | $24.73 | $200K | |
| Katie Seitz Evans - Officer | Tax withholding / forfeiture | Common Stock | 11,204 | $24.73 | $277K | |
| Aaron Saltz - Officer | Tax withholding / forfeiture | Common Stock | 5,627 | $24.73 | $139K | |
| Brian Gephart - Officer | Tax withholding / forfeiture | Common Stock | 3,789 | $24.73 | $94K | |
 Michael G. Barrett - Officer | Tax withholding / forfeiture | Common Stock | 10,404 | $24.73 | $257K | |
 David Day - Officer | Tax withholding / forfeiture | Common Stock | 14,170 | $24.73 | $350K | |
| Paul Caine - Director | Open-market sale | Common Stock | 7,500 | $25.00 | $188K | |
| Sean Patrick Buckley - Officer | Tax withholding / forfeiture | Common Stock | 11,715 | $24.73 | $290K | |
| Sean Patrick Buckley - Officer | Open-market sale | Common Stock | 8,271 | $24.31 footnote F3 | $201K | |
| Sean Patrick Buckley - Officer | Open-market sale | Common Stock | 2,759 | $25.00 | $69K | |
| ||||||
| David Day - Officer | Gift | Common Stock | 26,258 | $0.00 | - | |
| Brian Gephart - Officer | Open-market sale | Common Stock | 12,479 | $24.68 footnote F1 | $308K | |
| ||||||
| Rachel Lam - Director | Open-market sale | Common Stock | 10,000 | $24.16 footnote F1 | $242K | |
| ||||||
| Paul Caine - Director | Open-market sale | Common Stock | 5,000 | $24.35 footnote F2 | $122K | |
| ||||||
| Sean Patrick Buckley - Officer | Option exercise | Common Stock | 28,703 | $13.90 | $399K | |
| Sean Patrick Buckley - Officer | Open-market sale | Common Stock | 47,942 | $25.09 | $1.20M | |
| Sean Patrick Buckley - Officer | Open-market sale | Common Stock | 19,237 | $23.00 | $442K | |
| Sean Patrick Buckley - Officer | Option exercise | Stock Option (right to buy) | 28,703 | $0.00 footnote F3 | - | |
| ||||||
| Douglas S. Knopper - Director | Open-market sale | Common Stock | 37,337 | $22.72 | $848K | |
| David Buonasera - Officer | Open-market sale | Common Stock | 4,176 | $22.81 footnote F2 | $95K | |
| David Buonasera - Officer | Open-market sale | Common Stock | 2,602 | $24.00 | $62K | |
| David Buonasera - Officer | Open-market sale | Common Stock | 871 | $25.00 | $22K | |
| ||||||
| Katie Seitz Evans - Officer | Option exercise | Common Stock | 20,000 | $5.16 | $103K | |
| Katie Seitz Evans - Officer | Open-market sale | Common Stock | 20,000 | $24.00 | $480K | |
| Katie Seitz Evans - Officer | Option exercise | Employee Stock Option (Right to Buy) | 20,000 | $0.00 footnote F3 | - | |
| ||||||
| Michael G. Barrett - Officer | Option exercise | Common Stock | 293,968 | $5.80 | $1.71M | |
| Michael G. Barrett - Officer | Open-market sale | Common Stock | 293,968 | $22.72 | $6.68M | |
| Michael G. Barrett - Officer | Option exercise | Stock Option (right to buy) | 293,968 | $0.00 footnote F3 | - | |
| ||||||
| Michael G. Barrett - Officer | Option exercise | Common Stock | 38,596 | $5.80 | $224K | |
| Michael G. Barrett - Officer | Open-market sale | Common Stock | 38,596 | $20.35 footnote F2 | $785K | |
| Michael G. Barrett - Officer | Option exercise | Employee Stock Option (Right to Buy) | 38,596 | $0.00 footnote F4 | - | |
| ||||||
Item 1.01, 7.01, 9.01
Item 5.02, 9.01
Item 2.02, 9.01
Item 5.07
Recent MGNI Form 144 notices of proposed sale
3An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| PAUL CAINE | Director | 20,000 | $476K | View on EDGAR | |
| Douglas S. Knopper & Abigail L. Knopper TTEES of the Knopper Joint Mgmt Trust 11/15/13 | Director | 37,337 |
MGNI insider trading FAQ
What is the latest insider trade for MGNI?
MAGNITE, INC. (MGNI) had 30 insider filings in the last 90 days, with the most recent on 2026-10-02. The full record for MGNI runs to 142 Form 4 filings, the earliest from 2024-11-08. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying MGNI stock?
No insider purchases of MGNI were filed in the last 90 days.
How many insiders are selling MGNI stock?
28 insider sales of MGNI were filed in the last 90 days, totaling $16.92M.
Where can I see MGNI SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects MGNI Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Information Technology companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Haas Sullivan view on EDGAR
- - Brian Gephart view on EDGAR
- - Paul Caine view on EDGAR
- - Douglas S. Knopper view on EDGAR
- - David Buonasera view on EDGAR
- - Robert F. Spillane view on EDGAR
- - Katie Seitz Evans view on EDGAR
- - Aaron Saltz view on EDGAR
- - Paul Caine view on EDGAR
Related companies with recent insider activity
Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Information Technology
- Where MGNI's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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