Latest Period
Q2 2026
Security Snapshot
MAGNITE, INC. - Common Stock (MGNI) Institutional Ownership
CUSIP: 55955D100
13F Institutional Holders and Ownership History from Q1 2019 to Q2 2026
Institutions Reporting
305
Shares (Excl. Options)
141,685,915
Price
$18.98
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- Security type / class
- Equity / Common Stock
- Symbol
- MGNI on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 141,685,915
- Total 13F value
- $2,688,257,235
- Portfolio coverage rank
- 0.02%
- Share change
- +10,268,288
- Value change
- +$222,748,893
- Number of holders
- 305
- Shares outstanding
- 143,916,476
- SEC-reported price per share
- $18.51
- Insider filing price
- $18.51
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- MGNI - MAGNITE, INC. - Common Stock is tracked under CUSIP 55955D100.
- 305 institutions reported positions in Q2 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 296 to 305 between Q1 2026 and Q2 2026.
- SEC-reported value moved from $1,563,696,898 to $2,688,257,235.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 305 institutions filings for Q2 2026.
Security key
55955D100
Latest holder period
Q2 2026
13F holders
305
13D/G owners
5
CIK / CUSIP context first
Open Q2 2026 holders
MGNI full holder history
MAGNITE, INC. SEC filings
MAGNITE, INC. company facts
MAGNITE, INC. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 55955D100:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
MGNI
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.4% | $93,256,456 | 7,849,870 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| FMR LLC | 5.4% | +77% | $157,593,938 | +$66,048,262 | 7,759,426 | +72% | FMR LLC | 30 Jun 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | 5% | $86,525,949 | 7,283,329 | Vanguard Capital Management | 31 Mar 2026 | |||
| WELLINGTON MANAGEMENT GROUP LLP | 4.2% | -30% | $122,763,633 | -$52,496,191 | 6,044,492 | -30% | Wellington Management Group LLP | 30 Jun 2026 |
| Capital Research Global Investors | 3.5% | -61% | $60,695,294 | -$95,511,000 | 5,020,289 | -61% | Capital Research Global Investors | 31 Mar 2026 |
As of 30 Jun 2026, 305 institutional investors reported holding 141,685,915 shares of MAGNITE, INC. - Common Stock (MGNI). This represents 98% of the company’s total 143,916,476 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
71%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 8.8% | 12,713,156 | +9.1% | 0% | $241,295,708 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.7% | 8,197,286 | +6.1% | 0.01% | $155,584,488 |
| FMR LLC | 5.4% | 7,759,426 | +72% | 0.01% | $147,273,902 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.3% | 6,225,195 | +0.56% | 0% | $118,154,201 |
| WELLINGTON MANAGEMENT GROUP LLP | 4.2% | 6,044,492 | -34% | 0.02% | $114,724,458 |
| DIMENSIONAL FUND ADVISORS LP | 3.7% | 5,260,132 | +32% | 0.02% | $99,838,708 |
| Boston Partners | 3.5% | 5,013,835 | +6.2% | 0.09% | $95,854,485 |
| AMERICAN CENTURY COMPANIES INC | 3.2% | 4,622,736 | -0.09% | 0.04% | $87,739,553 |
| Capital Research Global Investors | 2.7% | 3,869,159 | -23% | 0.01% | $73,436,638 |
| Nuveen, LLC | 2.6% | 3,794,811 | +5.7% | 0.02% | $72,025,513 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.6% | 3,789,959 | +6.6% | 0% | $71,946,545 |
| Edenbrook Capital, LLC | 2.5% | 3,555,615 | +27% | 24% | $67,485,573 |
| STATE STREET CORP | 2.5% | 3,528,075 | +12% | 0% | $66,962,864 |
| 325 CAPITAL LLC | 2.4% | 3,412,694 | +70% | 15% | $64,772,932 |
| Nine Ten Capital Management LLC | 2.3% | 3,261,283 | -6.3% | 19% | $61,899,000 |
| Granahan Investment Management, LLC | 2.1% | 3,083,211 | +21% | 2.1% | $58,519,345 |
| CANADA PENSION PLAN INVESTMENT BOARD | 2.1% | 2,995,093 | +6404% | 0.03% | $56,846,865 |
| JANE STREET GROUP, LLC | 1.5% | 2,199,191 | +32% | 0.03% | $41,740,645 |
| Park West Asset Management LLC | 1.4% | 2,000,000 | +234% | 2.6% | $37,960,000 |
| MORGAN STANLEY | 1.4% | 1,991,732 | +115% | 0% | $37,803,076 |
| Qube Research & Technologies Ltd | 1.4% | 1,955,989 | +196% | 0.04% | $37,124,671 |
| Blue Grotto Capital, LLC | 1.2% | 1,706,741 | +28% | 2.7% | $32,393,945 |
| KENNEDY CAPITAL MANAGEMENT LLC | 1.2% | 1,666,799 | -4.9% | 0.56% | $31,635,845 |
| NORTHERN TRUST CORP | 1.1% | 1,553,412 | +17% | 0% | $29,483,760 |
| ROYCE & ASSOCIATES LP | 1% | 1,473,397 | +7.9% | 0.23% | $27,965,075 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
30
Latest
Q2 2026
Rows shown
1-25 of 30
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q2 | 141,685,915 | $2,688,257,235 | +$222,748,893 | $18.98 | 305 |
| 2026 Q1 | 131,564,487 | $1,563,696,898 | -$91,727,443 | $11.88 | 296 |
| 2025 Q4 | 136,686,890 | $2,218,534,075 | -$66,065,895 | $16.23 | 303 |
| 2025 Q3 | 138,012,684 | $3,003,860,929 | -$207,225,719 | $21.78 | 313 |
| 2025 Q2 | 146,964,373 | $3,543,069,968 | +$406,190,715 | $24.12 | 285 |
| 2025 Q1 | 132,644,878 | $1,513,348,970 | +$97,506,469 | $11.41 | 290 |
| 2024 Q4 | 123,449,236 | $1,965,951,862 | +$42,368,020 | $15.92 | 283 |
| 2024 Q3 | 119,561,299 | $1,654,115,115 | +$216,068,704 | $13.85 | 279 |
| 2024 Q2 | 104,326,333 | $1,386,459,925 | +$39,957,238 | $13.29 | 266 |
| 2024 Q1 | 102,110,845 | $1,097,564,621 | -$5,361,702 | $10.75 | 230 |
| 2023 Q4 | 102,653,022 | $958,824,603 | -$4,019,427 | $9.34 | 215 |
| 2023 Q3 | 103,476,989 | $780,247,255 | -$17,837,826 | $7.54 | 208 |
| 2023 Q2 | 101,048,317 | $1,380,031,436 | +$74,884,448 | $13.65 | 217 |
| 2023 Q1 | 96,353,092 | $892,115,344 | +$22,211,875 | $9.26 | 217 |
| 2022 Q4 | 93,373,687 | $988,829,597 | -$97,935,020 | $10.59 | 228 |
| 2022 Q3 | 103,432,133 | $679,628,120 | +$93,907,627 | $6.57 | 201 |
| 2022 Q2 | 87,980,237 | $781,403,356 | -$17,395,213 | $8.88 | 214 |
| 2022 Q1 | 88,698,180 | $1,171,861,875 | -$35,248,615 | $13.21 | 215 |
| 2021 Q4 | 89,542,528 | $1,566,754,035 | -$140,798,799 | $17.50 | 238 |
| 2021 Q3 | 90,069,072 | $2,521,283,357 | +$118,150,307 | $28.00 | 270 |
| 2021 Q2 | 85,375,930 | $2,889,381,654 | -$89,507,112 | $33.84 | 264 |
| 2021 Q1 | 86,041,634 | $3,579,979,338 | +$418,396,545 | $41.61 | 271 |
| 2020 Q4 | 76,786,392 | $2,357,551,419 | +$83,965,902 | $30.71 | 235 |
| 2020 Q3 | 83,209,025 | $577,796,330 | +$477,632,041 | $6.94 | 168 |
| 2020 Q2 | 14,428,175 | $96,233,000 | +$96,233,000 | $6.67 | 10 |