MAGNITE INC MGNI
COM · Common Stock · CUSIP 55955D100 · ISIN US55955D1000
American advertising technology and real-time bidding, serving as ad exchange
- SectorTechnology
- IndustryServices-Computer Programming, Data Processing, Etc.
- HeadquartersNew York, NY
- Founded2007
- Websitemagnite.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($1.8m this quarter). Holder counts are more reliable. Shares outstanding: 142.4m as of 2025-07-31, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $24.11. Options: 20 managers hold calls ($125.7m notional), 16 hold puts ($106.9m).
Trends to Q2 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 218 |
| Q4 2022 | 230 |
| Q1 2023 | 223 |
| Q2 2023 | 225 |
| Q3 2023 | 215 |
| Q4 2023 | 217 |
| Q1 2024 | 232 |
| Q2 2024 | 269 |
| Q3 2024 | 280 |
| Q4 2024 | 286 |
| Q1 2025 | 295 |
| Q2 2025 | 288 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2023 | 101 | 105 |
| Q4 2023 | 87 | 100 |
| Q1 2024 | 112 | 93 |
| Q2 2024 | 171 | 95 |
| Q3 2024 | 146 | 108 |
| Q4 2024 | 137 | 133 |
| Q1 2025 | 155 | 136 |
| Q2 2025 | 150 | 156 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $51.1m | $48.2m | 0.94 |
| Q4 2024 | $70.8m | $74.9m | 1.06 |
| Q1 2025 | $41.6m | $50.1m | 1.20 |
| Q2 2025 | $125.7m | $106.9m | 0.85 |
Biggest buyers
| FMR LLC | Added | +7.5m |
| Schonfeld Strategic Advisors LLC | New | +1.9m |
| AMERICAN CENTURY COMPANIES INC | Added | +1.9m |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Added | +1.4m |
| Apis Capital Advisors, LLC | New | +1.0m |
| Granahan Investment Management, LLC | Added | +992.8k |
| GOLDMAN SACHS GROUP INC | Added | +988.6k |
| BlackRock, Inc. | Added | +910.2k |
| Balyasny Asset Management L.P. | New | +699.9k |
| J. Goldman & Co LP | New | +603.7k |
Biggest sellers
| Qube Research & Technologies Ltd | Sold out | -1.0m |
| INTRINSIC EDGE CAPITAL MANAGEMENT LLC | Sold out | -733.0k |
| Granite Investment Partners, LLC | Sold out | -720.9k |
| NORDEA INVESTMENT MANAGEMENT AB | Reduced | -571.9k |
| AMERIPRISE FINANCIAL INC | Reduced | -536.9k |
| BANK OF AMERICA CORP /DE/ | Reduced | -500.0k |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | -455.4k |
| MILLENNIUM MANAGEMENT LLC | Sold out | -434.5k |
| Edenbrook Capital, LLC | Reduced | -406.7k |
| Weiss Asset Management LP | Reduced | -396.0k |
Biggest calls
| Caption Management, LLC | Added | $38.3m1.6m shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $21.3m882.4k shares |
| PEAK6 LLC | New | $16.1m668.0k shares |
| IMC-Chicago, LLC | Added | $7.9m325.9k shares |
| SIMPLEX TRADING, LLC | Added | $6.6m271.9k shares |
| JANE STREET GROUP, LLC | Added | $5.7m235.0k shares |
| GROUP ONE TRADING LLC | Reduced | $5.4m224.9k shares |
| WOLVERINE TRADING, LLC | Added | $4.3m203.2k shares |
| Squarepoint Ops LLC | Reduced | $4.1m169.5k shares |
| UBS Group AG | Reduced | $3.8m159.0k shares |
Biggest puts
| Squarepoint Ops LLC | Reduced | $43.0m1.8m shares |
| CITADEL ADVISORS LLC | Added | $15.3m634.9k shares |
| PEAK6 LLC | Added | $13.6m565.8k shares |
| Parallax Volatility Advisers, L.P. | Reduced | $12.1m500.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $8.4m350.1k shares |
| SIMPLEX TRADING, LLC | Added | $4.4m180.7k shares |
| GROUP ONE TRADING LLC | Added | $4.0m164.0k shares |
| IMC-Chicago, LLC | Reduced | $1.9m80.2k shares |
| WOLVERINE TRADING, LLC | Reduced | $1.4m67.6k shares |
| JANE STREET GROUP, LLC | Reduced | $1.3m52.7k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.4% |
| FMR LLC 13G · institution +2.3 pts · filed 2026-08-06 | 5.4% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-30 | 5.0% |
Fell to 5% or below in the last year: WELLINGTON MANAGEMENT GROUP LLP (4.2%, 2026-08-13), Capital Research Global Investors (3.5%, 2026-05-14), VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC)
Insider purchases and sales in Q2 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 9 | $2.4m | $1.4m |
| Q4 2023 | 0 | — | 1 | $585.0k | $585.0k |
| Q1 2024 | 0 | — | 2 | $1.0m | $195.2k |
| Q2 2024 | 0 | — | 8 | $3.1m | $2.1m |
| Q3 2024 | 0 | — | 6 | $3.9m | $2.4m |
| Q4 2024 | 0 | — | 9 | $7.0m | $6.8m |
| Q1 2025 | 0 | — | 8 | $5.8m | $5.7m |
| Q2 2025 | 0 | — | 12 | $17.7m | $17.0m |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-06-30 | Evans Katie Seitz President, Operations | Sold plan | $571.2k24.5k shares |
| 2025-06-30 | Day David CHIEF FINANCIAL OFFICER | Sold plan | $477.0k21.7k shares |
| 2025-06-30 | Saltz Aaron CHIEF LEGAL OFFICER | Sold plan | $386.6k17.6k shares |
| 2025-06-30 | Buonasera David CHIEF TECHNOLOGY OFFICER | Sold plan | $204.4k9.3k shares |
| 2025-06-26 | Day David CHIEF FINANCIAL OFFICER | Sold plan | $754.2k36.0k shares |
| 2025-06-24 | BARRETT MICHAEL G. CEO, director | Sold plan | $6.0m300.0k shares |
| 2025-06-24 | Soroca Adam Lee CHIEF PRODUCT OFFICER | Sold plan | $890.4k44.5k shares |
| 2025-06-24 | Day David CHIEF FINANCIAL OFFICER | Sold plan | $698.2k35.0k shares |
| 2025-06-24 | Caine Paul Director | Sold plan | $100.0k5.0k shares |
| 2025-06-18 | Rossman James Director | Sold plan | $2.6m137.0k shares |
| 2025-06-18 | Day David CHIEF FINANCIAL OFFICER | Sold plan | $722.9k38.1k shares |
| 2025-06-18 | BARRETT MICHAEL G. CEO, director | Sold plan | $570.0k30.0k shares |
| 2025-06-16 | BARRETT MICHAEL G. CEO, director | Sold plan | $799.2k45.0k shares |
| 2025-06-16 | Evans Katie Seitz President, Operations | Sold plan | $370.0k20.0k shares |
| 2025-06-16 | Saltz Aaron CHIEF LEGAL OFFICER | Sold plan | $293.8k16.8k shares |
| 2025-06-10 | Spillane Robert F Director | Sold | $263.6k15.0k shares |
| 2025-06-06 | PEARSON DAVID T. Director | Sold plan | $202.6k11.5k shares |
| 2025-06-06 | Soroca Adam Lee CHIEF PRODUCT OFFICER | Sold plan | $147.4k8.3k shares |
| 2025-06-05 | Evans Katie Seitz President, Operations | Sold plan | $607.6k35.0k shares |
| 2025-06-04 | Saltz Aaron CHIEF LEGAL OFFICER | Sold | $256.1k15.3k shares |
| 2025-05-27 | Buonasera David CHIEF TECHNOLOGY OFFICER | Sold plan | $139.9k8.7k shares |
| 2025-05-23 | Buonasera David CHIEF TECHNOLOGY OFFICER | Sold plan | $54.9k3.7k shares |
| 2025-05-20 | Soroca Adam Lee CHIEF PRODUCT OFFICER | Sold plan | $141.6k8.3k shares |
| 2025-05-16 | Soroca Adam Lee CHIEF PRODUCT OFFICER | Sold plan | $178.8k11.4k shares |
| 2025-05-16 | Buckley Sean Patrick President, Revenue | Sold plan | $152.5k9.7k shares |
| 2025-05-12 | Gephart Brian CHIEF ACCOUNTING OFFICER | Sold | $102.4k6.3k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2025
| Manager | Shares | Change |
|---|---|---|
| FMR LLC 0.02% of their portfolio | 17.2m $414.5m | Added +7.5m |
| VANGUARD GROUP INC 0.01% of their portfolio | 13.6m $327.1m | Reduced -181.2k |
| Capital Research Global Investors 0.06% of their portfolio | 12.9m $311.6m | Unchanged |
| BlackRock, Inc. 0.00% of their portfolio | 10.7m $258.0m | Added +910.2k |
| Boston Partners 0.15% of their portfolio | 5.6m $133.0m | Added +298.2k |
| WELLINGTON MANAGEMENT GROUP LLP 0.02% of their portfolio | 5.4m $131.4m | Reduced -455.4k |
| DIMENSIONAL FUND ADVISORS LP 0.03% of their portfolio | 4.9m $118.2m | Reduced -379.8k |
| AMERICAN CENTURY COMPANIES INC 0.06% of their portfolio | 4.8m $116.5m | Added +1.9m |
| Granahan Investment Management, LLC 3.58% of their portfolio | 3.6m $87.9m | Added +992.8k |
| Edenbrook Capital, LLC 38.39% of their portfolio | 3.6m $87.1m | Reduced -406.7k |
| Nuveen, LLC 0.02% of their portfolio | 3.3m $78.4m | Reduced -345.4k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 3.2m $77.6m | Added +183.4k |
| STATE STREET CORP 0.00% of their portfolio | 3.1m $73.7m | Added +150.5k |
| Nine Ten Capital Management LLC 20.51% of their portfolio | 2.9m $68.9m | Added +123.8k |
| Driehaus Capital Management LLC 0.54% of their portfolio | 2.8m $67.1m | Added +372.7k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.9m $46.2m | Added +988.6k |
| Schonfeld Strategic Advisors LLC 0.35% of their portfolio | 1.9m $45.8m | New |
| Bank of New York Mellon Corp 0.01% of their portfolio | 1.8m $43.4m | Added +1.1k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.40% of their portfolio | 1.8m $43.3m | Added +1.4m |
| NOMURA ASSET MANAGEMENT CO LTD 0.12% of their portfolio | 1.7m $42.0m | Reduced -315.1k |
| UBS Group AG 0.01% of their portfolio | 1.7m $41.8m | Added +99.3k |
| Maestria Partners LLC 12.02% of their portfolio | 1.4m $34.6m | Added +382.0k |
| Stephens Investment Management Group LLC 0.43% of their portfolio | 1.4m $32.6m | Added +399.4k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 1.3m $32.3m | Reduced -231.0k |
| MORGAN STANLEY 0.00% of their portfolio | 1.2m $28.2m | Added +294.7k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 1.1m $27.5m | Added +121.6k |
| ROYCE & ASSOCIATES LP 0.27% of their portfolio | 1.1m $26.0m | Reduced -104.9k |
| Apis Capital Advisors, LLC 8.98% of their portfolio | 1.0m $25.3m | New |
| GRIZZLYROCK CAPITAL, LLC 17.67% of their portfolio | 974.3k $23.5m | Added +75.8k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 938.1k $22.6m | Reduced -50.7k |
| KENNEDY CAPITAL MANAGEMENT LLC 0.50% of their portfolio | 869.1k $21.0m | Reduced -54.8k |
| CITADEL ADVISORS LLC 0.02% of their portfolio | 835.1k $20.1m | Added +242.2k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.13% of their portfolio | 804.2k $19.4m | Reduced -4.0k |
| Pacer Advisors, Inc. 0.05% of their portfolio | 791.8k $19.1m | Reduced -310.3k |
| Penn Capital Management Company, LLC 1.56% of their portfolio | 747.8k $18.1m | Reduced -166.9k |
| Meros Investment Management, LP 8.04% of their portfolio | 702.1k $16.9m | Reduced -47.3k |
| Balyasny Asset Management L.P. 0.04% of their portfolio | 699.9k $16.9m | New |
| HARBOR CAPITAL ADVISORS, INC. 0.64% of their portfolio | 634.1k $15.3m | Added +42.8k |
| First Eagle Investment Management, LLC 0.03% of their portfolio | 618.1k $14.9m | Added +122.5k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.03% of their portfolio | 614.3k $14.8m | Added +13.7k |
| J. Goldman & Co LP 0.46% of their portfolio | 603.7k $14.6m | New |
| Verition Fund Management LLC 0.08% of their portfolio | 595.5k $14.4m | Reduced -310.6k |
| Dana Investment Advisors, Inc. 0.47% of their portfolio | 585.9k $14.1m | Added +25.6k |
| KING LUTHER CAPITAL MANAGEMENT CORP 0.06% of their portfolio | 560.8k $13.5m | Reduced -22.0k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 543.3k $13.1m | Added +138.6k |
| OBERWEIS ASSET MANAGEMENT INC/ 0.54% of their portfolio | 514.0k $12.4m | Added +308.3k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 493.2k $11.9m | Reduced -162.9k |
| Norwood Investment Partners, LP 8.35% of their portfolio | 462.0k $11.1m | New |
| Kopion Asset Management, LLC 6.88% of their portfolio | 423.2k $10.2m | Reduced -175.8k |
| Alta Park Capital, LP 1.23% of their portfolio | 413.6k $10.0m | New |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 413.4k $10.0m | Reduced -500.0k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 393.6k $9.5m | Added +31.8k |
| ARDSLEY ADVISORY PARTNERS LP 1.46% of their portfolio | 370.0k $8.9m | Added +214.0k |
| Lisanti Capital Growth, LLC 2.46% of their portfolio | 368.0k $8.9m | Added +224.2k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 364.5k $8.8m | Reduced -37.3k |
| Advantage Alpha Capital Partners LP 2.23% of their portfolio | 342.6k $8.3m | Reduced -84.6k |
| Dilation Capital Management LP 4.30% of their portfolio | 334.7k $8.1m | New |
| NORDEA INVESTMENT MANAGEMENT AB 0.01% of their portfolio | 330.9k $7.9m | Reduced -571.9k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 322.2k $7.8m | Reduced -125.9k |
| 1492 Capital Management LLC 3.58% of their portfolio | 321.9k $7.8m | Reduced -3.9k |
| Manatuck Hill Partners, LLC 2.80% of their portfolio | 308.5k $7.4m | Added +196.0k |
| S SQUARED TECHNOLOGY, LLC 3.12% of their portfolio | 306.6k $7.4m | Reduced -45.0k |
| Blue Grotto Capital, LLC 0.83% of their portfolio | 284.8k $6.9m | New |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 284.3k $6.9m | Added +17.6k |
| BARCLAYS PLC 0.00% of their portfolio | 274.2k $6.6m | Added +102.9k |
| Swiss National Bank 0.00% of their portfolio | 272.6k $6.6m | Unchanged |
| Roubaix Capital, LLC 3.02% of their portfolio | 260.7k $6.3m | New |
| BANK OF MONTREAL /CAN/ 0.00% of their portfolio | 242.3k $5.8m | Added +1.4k |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 241.9k $5.8m | Added +21.4k |
| CITIGROUP INC 0.00% of their portfolio | 238.5k $5.8m | Added +84.9k |
| TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio | 237.8k $5.7m | Added +184.3k |
| Invesco Ltd. 0.00% of their portfolio | 230.3k $5.6m | Added +21.3k |
| VOYA INVESTMENT MANAGEMENT LLC 0.01% of their portfolio | 229.6k $5.5m | Reduced -190.6k |
| Connor, Clark & Lunn Investment Management Ltd. 0.02% of their portfolio | 225.3k $5.4m | Reduced -44.0k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 223.4k $5.4m | Added +30.9k |
| Informed Momentum Co LLC 0.79% of their portfolio | 217.5k $5.2m | New |
| EFG Asset Management (North America) Corp. 0.68% of their portfolio | 201.0k $4.8m | Reduced -35.5k |
| COMMONWEALTH EQUITY SERVICES, LLC 0.01% of their portfolio | 195.0k $4.7m | Added +29.0k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 186.0k $4.5m | Reduced -47.7k |
| CLOUGH CAPITAL PARTNERS L P 0.45% of their portfolio | 185.3k $4.5m | New |
| Parallax Volatility Advisers, L.P. 0.17% of their portfolio | 175.8k $4.2m | Reduced -93.2k |
| AYAL Capital Advisors Ltd 2.18% of their portfolio | 165.9k $4.0m | New |
| MOODY NATIONAL BANK TRUST DIVISION 0.36% of their portfolio | 161.3k $3.9m | Added +57.1k |
| Legal & General Group Plc 0.00% of their portfolio | 155.2k $3.7m | Added +12.3k |
| RICE HALL JAMES & ASSOCIATES, LLC 0.20% of their portfolio | 154.9k $3.7m | Reduced -1.9k |
| PRELUDE CAPITAL MANAGEMENT, LLC 0.36% of their portfolio | 153.6k $3.7m | Added +138.6k |
| CASTLEARK MANAGEMENT LLC 0.10% of their portfolio | 143.2k $3.5m | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 141.8k $3.4m | Added +10.1k |
| COMERICA BANK 0.01% of their portfolio | 141.6k $3.4m | Added +108.2k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 136.9k $3.3m | Added +300 |
| PERKINS CAPITAL MANAGEMENT INC 3.28% of their portfolio | 135.1k $3.3m | Reduced -10.0k |
| Hilton Capital Management, LLC 0.26% of their portfolio | 133.6k $3.2m | Reduced -29.2k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 132.6k $3.2m | Added +2.5k |
| P.A.W. CAPITAL CORP 6.04% of their portfolio | 130.0k $3.1m | Reduced -20.0k |
| PICTON MAHONEY ASSET MANAGEMENT 0.04% of their portfolio | 127.8k $3.1m | New |
| CANNELL CAPITAL LLC 0.95% of their portfolio | 126.6k $3.1m | New |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 117.6k $2.8m | Added +18.6k |
| Zweig-DiMenna Associates LLC 0.28% of their portfolio | 111.5k $2.7m | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 111.4k $2.7m | Added +17.5k |
| NORGES BANK 0.00% of their portfolio | 108.7k $2.6m | Reduced -110.6k |