MGNI
MAGNITE (MGNI)
NASDAQ
$22.75-$0.14 (-0.61%)
Price as of Oct 23, 2026 7:30 PM EDT
  • $3.3B
    Market Cap
  • 14.79%
    1-Year Change
  • Advertising Agencies
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
VANGUARD GROUP INC
10.32%
14.8M
+148,198 (+1.00%)
Dec 31, 2025
BLACKROCK, INC.
8.86%
12.7M
+1.1M (+8.30%)
Jun 30, 2026
BLACKROCK FUNDING, INC. /DE
7.09%
10.2M
+319,005 (+3.14%)
Dec 31, 2024
BLACKROCK INC.
6.76%
9.7M
-80,477 (-0.83%)
Jun 30, 2024
GRANAHAN INVESTMENT MANAGEMENT INC/MA
5.91%
8.5M
+1.3M (+15.56%)
Dec 31, 2021
N/A
5.72%
8.2M
+471,081 (+5.75%)
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
5.72%
8.2M
+471,081 (+5.75%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions2.2B (54.91%)
  • Mutual Funds1.8B (44.60%)
  • Insiders19.4M (0.49%)
  • Other0 (0.00%)

Insider Transactions

  • 0.49% (19.4M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 10
    Number of InsiderSelling (last 12 months)
  • $143.6M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Caine Paul
Sell
Oct 12, 2026
$316,125.00
12,500
$25.29
124,901
Sullivan Haas
CHIEF ACCOUNTING OFFICER
Award
Oct 01, 2026
$0.00
24,641
$0.00
97,554
Gephart Brian
CHIEF FINANCIAL OFFICER
Award
Oct 01, 2026
$0.00
64,682
$0.00
167,010
Caine Paul
Sell
Sep 17, 2026
$198,750.00
7,500
$26.50
137,401
Knopper Douglas S
Sell
Sep 17, 2026
$981,216.36
37,337
$26.28
51,136
Buonasera David
CHIEF TECHNOLOGY OFFICER
Sell
Sep 14, 2026
$27,960.00
1,165
$24.00
245,155
Spillane Robert F
Exempt
Sep 14, 2026
$0.00
10,363
$0.00
0
Spillane Robert F
Exempt
Sep 14, 2026
$53,576.71
10,363
$5.17
68,078
Spillane Robert F
Sell
Sep 14, 2026
$246,224.88
10,363
$23.76
57,715
Evans Katie Seitz
See Remarks
Sell
Sep 11, 2026
$335,928.00
13,997
$24.00
441,800
Saltz Aaron
CHIEF LEGAL OFFICER
Sell
Sep 10, 2026
$936,400.00
40,000
$23.41
224,389
Buonasera David
CHIEF TECHNOLOGY OFFICER
Sell
Sep 02, 2026
$26,075.00
1,043
$25.00
246,320
Buonasera David
CHIEF TECHNOLOGY OFFICER
Sell
Sep 01, 2026
$125,788.82
5,371
$23.42
247,363
Buckley Sean Patrick
See Remarks
Sell
Aug 18, 2026
$68,975.00
2,759
$25.00
293,060
Buckley Sean Patrick
See Remarks
Sell
Aug 17, 2026
$201,068.01
8,271
$24.31
295,819
Gephart Brian
CHIEF ACCOUNTING OFFICER
In Kind
Aug 15, 2026
$93,701.97
3,789
$24.73
102,328
BARRETT MICHAEL G.
CEO
In Kind
Aug 15, 2026
$257,290.92
10,404
$24.73
392,670
Day David
CHIEF FINANCIAL OFFICER
In Kind
Aug 15, 2026
$350,424.10
14,170
$24.73
452,861
Buonasera David
CHIEF TECHNOLOGY OFFICER
In Kind
Aug 15, 2026
$200,362.46
8,102
$24.73
252,734
Buckley Sean Patrick
See Remarks
In Kind
Aug 15, 2026
$289,711.95
11,715
$24.73
304,090
Evans Katie Seitz
See Remarks
In Kind
Aug 15, 2026
$277,074.92
11,204
$24.73
485,636
Caine Paul
Sell
Aug 10, 2026
$121,750.00
5,000
$24.35
157,401
Gephart Brian
CHIEF ACCOUNTING OFFICER
Sell
Aug 10, 2026
$307,981.72
12,479
$24.68
106,117
Buckley Sean Patrick
See Remarks
Exempt
Aug 06, 2026
$0.00
28,703
$0.00
57,405
Evans Katie Seitz
See Remarks
Exempt
Aug 06, 2026
$0.00
20,000
$0.00
0
Buckley Sean Patrick
See Remarks
Exempt
Aug 06, 2026
$398,971.70
28,703
$13.90
382,984
BARRETT MICHAEL G.
CEO
Exempt
Aug 06, 2026
$0.00
293,968
$0.00
0
Buckley Sean Patrick
See Remarks
Sell
Aug 06, 2026
$1.2M
47,942
$25.09
335,042
Buonasera David
CHIEF TECHNOLOGY OFFICER
Sell
Aug 06, 2026
$95,254.56
4,176
$22.81
264,309
Buckley Sean Patrick
See Remarks
Sell
Aug 06, 2026
$442,451.00
19,237
$23.00
315,805