Barrett Michael G.
CEO
Disposition
Calculated transaction value
$257.29K
10,404 shares @ $24.73
Traded
Aug 15, 2026
Filed
Aug 18, 2026
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Magnite
MGNI
ServicesBusiness Services
Transactions reported in official disclosures
Price with disclosed trades
Daily closes, past year · marks sit on transaction dates, sized by value
83 trades
| Reporting person | Filed | Transaction | Transaction value | Source | Actions |
|---|---|---|---|---|---|
| Barrett Michael G. CEO | Aug 18, 2026 3-day lag | Disposition Aug 15, 2026 | $257.29K Filed shares x price | SEC Form 4 View filing | |
| Day David Chief Financial Officer | Aug 18, 2026 3-day lag | Disposition Aug 15, 2026 | $350.42K Filed shares x price | SEC Form 4 View filing | |
| Caine Paul Director | Aug 18, 2026 4-day lag | Sale Aug 14, 2026 | $187.5K Filed shares x price | SEC Form 4 View filing | |
| Day David Chief Financial Officer | Aug 14, 2026 1-day lag | Gift Aug 13, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Gephart Brian Chief Accounting Officer | Aug 12, 2026 2-day lag | Sale Aug 10, 2026 | $307.98K Filed shares x price | SEC Form 4 View filing | |
| Lam Rachel Director | Aug 12, 2026 2-day lag | Sale Aug 10, 2026 | $241.6K Filed shares x price | SEC Form 4 View filing | |
| Caine Paul Director | Aug 12, 2026 2-day lag | Sale Aug 10, 2026 | $121.75K Filed shares x price | SEC Form 4 View filing | |
| Buckley Sean Patrick See Remarks | Aug 7, 2026 1-day lag | Sale Aug 6, 2026 | $442.45K Filed shares x price | SEC Form 4 View filing | |
| Buckley Sean Patrick See Remarks | Aug 7, 2026 1-day lag | Sale Aug 6, 2026 | $1.2M Filed shares x price | SEC Form 4 View filing | |
| Buckley Sean Patrick See Remarks | Aug 7, 2026 1-day lag | Exercise Aug 6, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Buckley Sean Patrick See Remarks | Aug 7, 2026 1-day lag | Exercise Aug 6, 2026 | $398.97K Filed shares x price | SEC Form 4 View filing | |
| Knopper Douglas S Director | Aug 7, 2026 1-day lag | Sale Aug 6, 2026 | $848.3K Filed shares x price | SEC Form 4 View filing | |
| Buonasera David Chief Technology Officer | Aug 7, 2026 1-day lag | Sale Aug 6, 2026 | $62.45K Filed shares x price | SEC Form 4 View filing | |
| Buonasera David Chief Technology Officer | Aug 7, 2026 1-day lag | Sale Aug 6, 2026 | $95.25K Filed shares x price | SEC Form 4 View filing | |
| Buonasera David Chief Technology Officer | Aug 7, 2026 1-day lag | Sale Aug 6, 2026 | $21.77K Filed shares x price | SEC Form 4 View filing | |
| Evans Katie Seitz See Remarks | Aug 7, 2026 1-day lag | Exercise Aug 6, 2026 | $103.2K Filed shares x price | SEC Form 4 View filing | |
| Evans Katie Seitz See Remarks | Aug 7, 2026 1-day lag | Exercise Aug 6, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Evans Katie Seitz See Remarks | Aug 7, 2026 1-day lag | Sale Aug 6, 2026 | $480K Filed shares x price | SEC Form 4 View filing | |
| Barrett Michael G. CEO | Aug 7, 2026 1-day lag | Sale Aug 6, 2026 | $6.68M Filed shares x price | SEC Form 4 View filing | |
| Barrett Michael G. CEO | Aug 7, 2026 1-day lag | Exercise Aug 6, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Barrett Michael G. CEO | Aug 7, 2026 1-day lag | Exercise Aug 6, 2026 | $1.71M Filed shares x price | SEC Form 4 View filing | |
| Barrett Michael G. CEO | Jul 17, 2026 2-day lag | Sale Jul 15, 2026 | $785.43K Filed shares x price | SEC Form 4 View filing | |
| Barrett Michael G. CEO | Jul 17, 2026 2-day lag | Exercise Jul 15, 2026 | $223.86K Filed shares x price | SEC Form 4 View filing | |
| Barrett Michael G. CEO | Jul 17, 2026 2-day lag | Exercise Jul 15, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Caine Paul Director | Jul 14, 2026 4-day lag | Sale Jul 10, 2026 | $103.2K Filed shares x price | SEC Form 4 View filing | |
| Buonasera David Chief Technology Officer | Jul 9, 2026 2-day lag | Sale Jul 7, 2026 | $25.7K Filed shares x price | SEC Form 4 View filing | |
| Buckley Sean Patrick See Remarks | Jul 9, 2026 2-day lag | Sale Jul 7, 2026 | $404.47K Filed shares x price | SEC Form 4 View filing | |
| Buonasera David Chief Technology Officer | Jul 2, 2026 1-day lag | Sale Jul 1, 2026 | $187.52K Filed shares x price | SEC Form 4 View filing | |
| Barrett Michael G. CEO | Jul 1, 2026 2-day lag | Exercise Jun 29, 2026 | $0 Filed shares x price | SEC Form 4 View filing | |
| Barrett Michael G. CEO | Jul 1, 2026 2-day lag | Sale Jun 29, 2026 | $1.46M Filed shares x price | SEC Form 4 View filing |
Day David
Chief Financial Officer
Disposition
Calculated transaction value
$350.42K
14,170 shares @ $24.73
Traded
Aug 15, 2026
Filed
Aug 18, 2026
Caine Paul
Director
Sale
Calculated transaction value
$187.5K
7,500 shares @ $25
Traded
Aug 14, 2026
Filed
Aug 18, 2026
Day David
Chief Financial Officer
Gift
Calculated transaction value
$0
26,258 shares @ $0
Traded
Aug 13, 2026
Filed
Aug 14, 2026
Gephart Brian
Chief Accounting Officer
Sale
Calculated transaction value
$307.98K
12,479 shares @ $24.68
Traded
Aug 10, 2026
Filed
Aug 12, 2026
Lam Rachel
Director
Sale
Calculated transaction value
$241.6K
10,000 shares @ $24.16
Traded
Aug 10, 2026
Filed
Aug 12, 2026
Caine Paul
Director
Sale
Calculated transaction value
$121.75K
5,000 shares @ $24.35
Traded
Aug 10, 2026
Filed
Aug 12, 2026
Buckley Sean Patrick
See Remarks
Sale
Calculated transaction value
$442.45K
19,237 shares @ $23
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Buckley Sean Patrick
See Remarks
Sale
Calculated transaction value
$1.2M
47,942 shares @ $25.09
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Buckley Sean Patrick
See Remarks
Exercise
Calculated transaction value
$0
28,703 shares @ $0
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Buckley Sean Patrick
See Remarks
Exercise
Calculated transaction value
$398.97K
28,703 shares @ $13.9
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Knopper Douglas S
Director
Sale
Calculated transaction value
$848.3K
37,337 shares @ $22.72
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Buonasera David
Chief Technology Officer
Sale
Calculated transaction value
$62.45K
2,602 shares @ $24
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Buonasera David
Chief Technology Officer
Sale
Calculated transaction value
$95.25K
4,176 shares @ $22.81
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Buonasera David
Chief Technology Officer
Sale
Calculated transaction value
$21.77K
871 shares @ $25
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Evans Katie Seitz
See Remarks
Exercise
Calculated transaction value
$103.2K
20,000 shares @ $5.16
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Evans Katie Seitz
See Remarks
Exercise
Calculated transaction value
$0
20,000 shares @ $0
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Evans Katie Seitz
See Remarks
Sale
Calculated transaction value
$480K
20,000 shares @ $24
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Barrett Michael G.
CEO
Sale
Calculated transaction value
$6.68M
293,968 shares @ $22.72
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Barrett Michael G.
CEO
Exercise
Calculated transaction value
$0
293,968 shares @ $0
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Barrett Michael G.
CEO
Exercise
Calculated transaction value
$1.71M
293,968 shares @ $5.8
Traded
Aug 6, 2026
Filed
Aug 7, 2026
Barrett Michael G.
CEO
Sale
Calculated transaction value
$785.43K
38,596 shares @ $20.35
Traded
Jul 15, 2026
Filed
Jul 17, 2026
Barrett Michael G.
CEO
Exercise
Calculated transaction value
$223.86K
38,596 shares @ $5.8
Traded
Jul 15, 2026
Filed
Jul 17, 2026
Barrett Michael G.
CEO
Exercise
Calculated transaction value
$0
38,596 shares @ $0
Traded
Jul 15, 2026
Filed
Jul 17, 2026
Caine Paul
Director
Sale
Calculated transaction value
$103.2K
5,000 shares @ $20.64
Traded
Jul 10, 2026
Filed
Jul 14, 2026
Buonasera David
Chief Technology Officer
Sale
Calculated transaction value
$25.7K
1,224 shares @ $21
Traded
Jul 7, 2026
Filed
Jul 9, 2026
Buckley Sean Patrick
See Remarks
Sale
Calculated transaction value
$404.47K
19,233 shares @ $21.03
Traded
Jul 7, 2026
Filed
Jul 9, 2026
Buonasera David
Chief Technology Officer
Sale
Calculated transaction value
$187.52K
9,376 shares @ $20
Traded
Jul 1, 2026
Filed
Jul 2, 2026
Barrett Michael G.
CEO
Exercise
Calculated transaction value
$0
75,000 shares @ $0
Traded
Jun 29, 2026
Filed
Jul 1, 2026
Barrett Michael G.
CEO
Sale
Calculated transaction value
$1.46M
75,000 shares @ $19.5
Traded
Jun 29, 2026
Filed
Jul 1, 2026