- Type / Class
- Equity / COMMON STOCK
- Shares outstanding
- 145,400,599
- Total 13F shares
- 136,686,832
- Share change
- -1,885,057
- Total reported value
- $2,218,533,134
- Put/Call ratio
- 71%
- Price per share
- $16.23
- Number of holders
- 301
- Value change
- -$66,065,749
- Number of buys
- 168
- Number of sells
- 149
Quarterly Holders Quick Answers
What is CUSIP 55955D100?
CUSIP 55955D100 identifies MGNI - MAGNITE, INC. - COMMON STOCK in SEC institutional holdings data.
Need full ownership history?
Open the full security ownership history page.
Next holder-history checks
These links keep the next click tied to holder verification, nearby quarters, or outside-13F ownership context.
- Back to full security ownership history for the broader multi-quarter picture.
- Latest 13F filings for newly reported positions across managers.
- Latest Schedule 13D/13G reports for ownership changes outside the 13F cadence.
- SEC investors directory for manager drilldown.
Explore More Reporting Periods
Jump to adjacent filing periods for faster comparison and easier crawl discovery.
Recent filing periods for CUSIP 55955D100:
Top shareholders of MGNI - MAGNITE, INC. - COMMON STOCK (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| FMR LLC |
13F
|
Company |
12%
|
17,141,014
|
$373,331,284 | — | 30 Sep 2025 | |
| VANGUARD GROUP INC |
13F
|
Company |
10%
|
14,654,432
|
$319,173,529 | — | 30 Sep 2025 | |
| BlackRock, Inc. |
13F
|
Company |
7.8%
|
11,413,155
|
$248,578,526 | — | 30 Sep 2025 | |
| Capital Research Global Investors |
13D/G
13F
|
Company |
9%
|
12,920,289
|
$207,887,450 | +$95,533,217 | 31 Dec 2025 | |
| WELLINGTON MANAGEMENT GROUP LLP |
13D/G
13F
|
Company |
6%
|
8,629,238
|
$138,844,439 | $0 | 31 Dec 2025 | |
| AMERICAN CENTURY COMPANIES INC |
13F
|
Company |
3.2%
|
4,594,070
|
$100,058,887 | — | 30 Sep 2025 | |
| Boston Partners |
13F
|
Company |
3.1%
|
4,449,004
|
$95,207,440 | — | 30 Sep 2025 | |
| Granahan Investment Management, LLC |
13F
|
Company |
2.7%
|
3,873,179
|
$84,357,839 | — | 30 Sep 2025 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
2.5%
|
3,567,254
|
$77,700,093 | — | 30 Sep 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2.3%
|
3,399,093
|
$74,042,436 | — | 30 Sep 2025 | |
| STATE STREET CORP |
13F
|
Company |
2.2%
|
3,126,790
|
$68,101,486 | — | 30 Sep 2025 | |
| Nuveen, LLC |
13F
|
Company |
2.1%
|
3,092,036
|
$67,344,545 | — | 30 Sep 2025 | |
| Nine Ten Capital Management LLC |
13F
|
Company |
2%
|
2,858,583
|
$62,260,000 | — | 30 Sep 2025 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
|
Company |
1.8%
|
2,547,505
|
$55,486,000 | — | 30 Sep 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
1.6%
|
2,385,439
|
$51,954,861 | — | 30 Sep 2025 | |
| Edenbrook Capital, LLC |
13F
|
Company |
1.5%
|
2,110,370
|
$45,963,859 | — | 30 Sep 2025 | |
| MORGAN STANLEY |
13F
|
Company |
1.4%
|
2,046,237
|
$44,567,069 | — | 30 Sep 2025 | |
| Blue Grotto Capital, LLC |
13F
|
Company |
1.1%
|
1,548,796
|
$33,732,776 | — | 30 Sep 2025 | |
| DRIEHAUS CAPITAL MANAGEMENT LLC |
13F
|
Company |
1%
|
1,516,296
|
$33,024,927 | — | 30 Sep 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.94%
|
1,365,056
|
$29,730,919 | — | 30 Sep 2025 | |
| NOMURA ASSET MANAGEMENT CO LTD |
13F
|
Company |
0.92%
|
1,339,765
|
$29,180,081 | — | 30 Sep 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.87%
|
1,261,893
|
$27,484,031 | — | 30 Sep 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
0.84%
|
1,217,848
|
$26,524,729 | — | 30 Sep 2025 | |
| KENNEDY CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.83%
|
1,213,613
|
$26,432,491 | — | 30 Sep 2025 | |
| JPMORGAN CHASE & CO |
13F
|
Company |
0.83%
|
1,209,413
|
$26,341,015 | — | 30 Sep 2025 | |
| Maestria Partners LLC |
13F
|
Company |
0.78%
|
1,141,171
|
$24,854,704 | — | 30 Sep 2025 | |
| FRONTIER CAPITAL MANAGEMENT CO LLC |
13F
|
Company |
0.75%
|
1,093,233
|
$23,810,623 | — | 30 Sep 2025 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
0.75%
|
1,090,623
|
$23,753,769 | — | 30 Sep 2025 | |
| J. Goldman & Co LP |
13F
|
Company |
0.71%
|
1,028,698
|
$22,405,042 | — | 30 Sep 2025 | |
| ROYCE & ASSOCIATES LP |
13F
|
Company |
0.67%
|
976,151
|
$21,260,569 | — | 30 Sep 2025 | |
| Stephens Investment Management Group LLC |
13F
|
Company |
0.66%
|
964,543
|
$21,007,747 | — | 30 Sep 2025 | |
| T. Rowe Price Investment Management, Inc. |
13F
|
Company |
0.61%
|
890,918
|
$19,405,000 | — | 30 Sep 2025 | |
| APIS CAPITAL ADVISORS, LLC |
13F
|
Company |
0.58%
|
839,399
|
$18,282,110 | — | 30 Sep 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0.55%
|
796,244
|
$17,342,194 | — | 30 Sep 2025 | |
| Penn Capital Management Company, LLC |
13F
|
Company |
0.49%
|
713,933
|
$15,587,702 | — | 30 Sep 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
0.47%
|
676,349
|
$14,730,881 | — | 30 Sep 2025 | |
| 325 CAPITAL LLC |
13F
|
Company |
0.45%
|
650,061
|
$14,158,329 | — | 30 Sep 2025 | |
| Meros Investment Management, LP |
13F
|
Company |
0.42%
|
613,828
|
$13,369,174 | — | 30 Sep 2025 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP |
13F
|
Company |
0.42%
|
612,985
|
$13,350,813 | — | 30 Sep 2025 | |
| First Eagle Investment Management, LLC |
13F
|
Company |
0.4%
|
575,443
|
$12,533,149 | — | 30 Sep 2025 | |
| SILVERCREST ASSET MANAGEMENT GROUP LLC |
13F
|
Company |
0.36%
|
524,897
|
$11,432,257 | — | 30 Sep 2025 | |
| OBERWEIS ASSET MANAGEMENT INC/ |
13F
|
Company |
0.35%
|
514,000
|
$11,194,920 | — | 30 Sep 2025 | |
| NEW YORK STATE COMMON RETIREMENT FUND |
13F
|
Company |
0.33%
|
474,457
|
$10,333,673 | — | 30 Sep 2025 | |
| KING LUTHER CAPITAL MANAGEMENT CORP |
13F
|
Company |
0.31%
|
449,960
|
$9,800,129 | — | 30 Sep 2025 | |
| TUDOR INVESTMENT CORP ET AL |
13F
|
Company |
0.31%
|
449,109
|
$9,781,594 | — | 30 Sep 2025 | |
| NORDEA INVESTMENT MANAGEMENT AB |
13F
|
Company |
0.31%
|
447,340
|
$9,693,858 | — | 30 Sep 2025 | |
| Norwood Investment Partners, LP |
13F
|
Company |
0.3%
|
430,000
|
$9,365,400 | — | 30 Sep 2025 | |
| UBS Group AG |
13F
|
Company |
0.29%
|
425,277
|
$9,262,533 | — | 30 Sep 2025 | |
| Universal- Beteiligungs- und Servicegesellschaft mbH |
13F
|
Individual |
0.28%
|
413,150
|
$8,998,408 | — | 30 Sep 2025 | |
| Dana Investment Advisors, Inc. |
13F
|
Company |
0.28%
|
409,121
|
$8,910,655 | — | 30 Sep 2025 |
Institutional Holders of MAGNITE, INC. - COMMON STOCK (MGNI) as of Q4 2025
As of 31 Dec 2025,
MAGNITE, INC. - COMMON STOCK (MGNI) was held by
301 institutional
shareholders
that filed Form 13F with the SEC.
Together, they reported ownership of
136,686,832 shares.
The largest 10 holders included
VANGUARD GROUP INC, Capital Research Global Investors, BlackRock, Inc., WELLINGTON MANAGEMENT GROUP LLP, FMR LLC, AMERICAN CENTURY COMPANIES INC, Boston Partners, DIMENSIONAL FUND ADVISORS LP, Nuveen, LLC, and GEODE CAPITAL MANAGEMENT, LLC.
This page lists
301
institutional shareholders reporting positions in this security
for the Q4 2025 filing period.
| Investor | Option | Weight % | Change % | Value $ | * Price | Shares | Share Change | Activity | Report Period |
|---|
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
313
Q4 2025 holders
301
Holder diff
-12
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 Value $ | Q4 2025 Value $ | Value Diff $ | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.
An asterisk sign (*) next to the price indicates that the price is likely invalid.