MGNI
MAGNITE (MGNI)
NASDAQ
$29.33-$0.007 (-0.02%)
Price as of Nov 13, 2026 12:36 PM EST
  • $4.2B
    Market Cap
  • 106.18%
    1-Year Change
  • Advertising Agencies
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
VANGUARD GROUP INC
10.31%
14.8M
+148,198 (+1.00%)
Dec 31, 2025
BLACKROCK, INC.
8.86%
12.7M
+1.1M (+8.30%)
Jun 30, 2026
FMR LLC
8.21%
11.8M
+4.0M (+34.15%)
Sep 30, 2026
BLACKROCK FUNDING, INC. /DE
7.08%
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
5.71%
8.2M
+471,081 (+5.75%)
Jun 30, 2026

Current Ownership Distribution

  • Institutions2.2B (55.25%)
  • Mutual Funds1.8B (44.27%)
  • Insiders19.4M (0.48%)
  • Other0 (0.00%)

Insider Transactions

  • 0.48% (19.4M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 11
    Number of InsiderSelling (last 12 months)
  • $188.0M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Sullivan Haas
CHIEF ACCOUNTING OFFICER
Sell
Nov 11, 2026
$71,814.93
2,427
$29.59
95,127
Gephart Brian
CHIEF FINANCIAL OFFICER
Sell
Nov 09, 2026
$106,486.00
3,700
$28.78
163,310
Saltz Aaron
CHIEF LEGAL OFFICER
Sell
Nov 09, 2026
$275,915.67
9,597
$28.75
214,792
Evans Katie Seitz
See Remarks
Sell
Nov 09, 2026
$758,114.88
26,178
$28.96
415,622
Buonasera David
CHIEF TECHNOLOGY OFFICER
Sell
Nov 09, 2026
$25,259.00
871
$29.00
238,578
Buonasera David
CHIEF TECHNOLOGY OFFICER
Sell
Nov 05, 2026
$115,344.00
4,272
$27.00
240,883
Buonasera David
CHIEF TECHNOLOGY OFFICER
Sell
Nov 05, 2026
$40,152.00
1,434
$28.00
239,449
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