Rubicon Project Inc

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Rubicon Project Inc
TickerMGNI
CIK #0001595974
CUSIP55955D100
SectorTechnology - Services-Computer Programming, Data Processing, Etc.
Address12181 Bluff Creek Drive, 4th Floor, Los Angeles, CA 90094
Source [EDGAR]
CIK Filing 2011 - 2025
[0001595974] 10-K
[0001595974] 10-Q
[0001595974] 3
[0001595974] 4
[0001595974] 8-K
[0001595974] SC 13D
[0001595974] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
FMR LLC Magnite Inc [2025-05-12] 0.0
Capital Research Global Investors Magnite Inc [2025-02-13] 0.0
FMR LLC Magnite Inc [2024-02-09] 0.0
Edenbrook Capital LLC Magnite Inc [2022-11-10] 5.17
Granahan Investment Management LLC Magnite Inc [2022-02-14] 6.44
Vanguard Group Inc Magnite Inc [2022-02-10] 8.97
FMR LLC Magnite Inc [2022-02-09] 0.0
Bertelsmann SE & Co KGAA Magnite Inc [2021-05-10] 9.6
BlackRock Inc Rubicon Project Inc [2020-02-07] 6.6
Outerbridge Capital Management LLC Rubicon Project Inc [2019-12-23] 5.51
Outerbridge Capital Management LLC Rubicon Project Inc [2019-12-02] 4.41
Dimensional Fund Advisors LP Rubicon Project Inc [2019-02-08] 5.06
BlackRock Inc Rubicon Project Inc [2018-02-01] 5.5
Divisar Capital Management LLC Rubicon Project Inc [2017-08-08] 5.1
Rubicon Project Inc Rubicon Project Inc [2016-02-16] 3.6
Bank of Montreal /Can/ Rubicon Project Inc [2016-02-16] 6.8454
PRIMECAP Management Co/CA/ Rubicon Project Inc [2015-12-07] 5.3
40 North Management LLC Rubicon Project Inc [2015-11-27] 6.5
Addante Frank Rubicon Project Inc [2015-04-09] 7.6
Clearstone Venture Partners III-A LP Rubicon Project Inc [2015-02-17] 17.2
News Corp Rubicon Project Inc [2015-02-13] 13.2
Mayfield XII Management LLC Rubicon Project Inc [2015-01-30] 11.4
Form 3/4/5 Filer 2011 - 2025
Buonasera David
Magnite Inc
Buckley Sean Patrick
Saltz Aaron
Evans Katie Seitz
Day David
Barrett Michael G
Soroca Adam Lee
Gephart Brian
Lam Rachel
Caine Paul
Rossman James
Spillane Robert F
Yu Diane
Harden Sarah Patricia
Knopper Douglas S
Pearson David T
Frankenberg Robert J
TROE Lisa L
Dove James Allen
Prusz Joseph R
Kershaw Thomas
Hughes Shawna
Filip Eve
Tuller Blima
Zagorski Mark
Addante Frank
Feldman Jonathan
Coleman Lewis W
Mandal Sumant
Copple Brian William
Raifman Gregory R
Patz Harry Jr
Richter James Neal
Tappin Todd L
Clearstone Venture Management III, L.L.C.
Clearstone Venture Partners III-B, a Delaware Multiple Serie
Clearstone Venture Partners III-A LP
Mayfield Principals Fund XII
Mayfield XII A Delaware L P
Beck James T
Vasan Robert T
Chaddha Navin
Mayfield Associates Fund XII
Mayfield XII Management, L.L.C.
MOHN JARL
News Corp
Form 13F Holdings
Firm Period DFND Voting Shares
FMR LLC [2025-06-30] DFND 17,180,178 17,185,939
Vanguard Group Inc [2025-06-30] SOLE 0 13,219,164
Capital Research Global Investors [2025-06-30] DFND 12,920,070 12,920,070
BlackRock, Inc. [2025-06-30] SOLE 10,430,460 10,698,044
Wellington Management Group LLP [2025-06-30] DFND 0 5,447,837
Boston Partners [2025-06-30] DFND 4,791,870 5,047,376
American Century Companies Inc [2025-06-30] DFND 3,847,986 4,829,197
Dimensional Fund Advisors LP [2025-06-30] SOLE 4,447,814 4,545,924
Granahan Investment Management LLC [2025-06-30] SOLE 3,046,891 3,642,786
Nuveen, LLC [2025-06-30] DFND 3,220,023 3,251,092
Geode Capital Management LLC [2025-06-30] DFND 3,216,842 3,216,842
Edenbrook Capital LLC [2025-06-30] DFND 3,145,843 3,145,843
State Street Corp [2025-06-30] DFND 2,690,301 3,053,607
Nine Ten Capital Management LLC [2025-06-30] SOLE 2,858,583 2,858,583
Driehaus Capital Management LLC [2025-06-30] SOLE 2,154,218 2,782,178
Squarepoint Ops LLC [2025-06-30] DFND 0 1,951,600
Goldman Sachs Group Inc [2025-06-30] DFND 1,914,162 1,915,400
UBS Group AG [2025-06-30] DFND 1,904,328 1,907,218
Schonfeld Strategic Advisors LLC [2025-06-30] SOLE 1,900,598 1,900,598
Frontier Capital Management Co LLC [2025-06-30] SOLE 933,880 1,793,830
Nomura Asset Management Co Ltd [2025-06-30] SOLE 1,792,163 1,740,741
Citadel Advisors LLC [2025-06-30] DFND 1,616,402 1,616,402
Susquehanna International Group LLP [2025-06-30] OTR 364,532 1,597,032
Bank of New York Mellon Corp [2025-06-30] DFND 1,547,345 1,593,215
Caption Management LLC [2025-06-30] SOLE 1,587,000 1,587,000
Maestria Partners LLC [2025-06-30] SOLE 1,434,317 1,434,317
Stephens Investment Management Group LLC [2025-06-30] DFND 0 1,350,096
Northern Trust Corp [2025-06-30] DFND 1,315,340 1,316,372
Morgan Stanley [2025-06-30] DFND 1,007,753 1,170,555
Charles Schwab Investment Management Inc [2025-06-30] SOLE 1,139,541 1,139,541
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