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 ($141.5k this quarter). Holder counts are more reliable. Shares outstanding: 137.9m as of 2023-11-02, 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 ≈ $7.54. Options: 16 managers hold calls ($20.0m notional), 15 hold puts ($22.3m).
Trends to Q3 2023
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 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2022 | 115 | 99 |
| Q1 2023 | 107 | 111 |
| Q2 2023 | 105 | 100 |
| Q3 2023 | 101 | 105 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2022 | $21.1m | $47.2m | 2.24 |
| Q1 2023 | $20.0m | $35.8m | 1.79 |
| Q2 2023 | $33.6m | $42.8m | 1.27 |
| Q3 2023 | $20.0m | $22.3m | 1.11 |
Biggest buyers
| Nine Ten Capital Management LLC | New | +3.9m |
| Burgundy Asset Management Ltd. | New | +2.4m |
| Rubric Capital Management LP | Added | +1.8m |
| Parallax Volatility Advisers, L.P. | Added | +933.3k |
| WELLINGTON MANAGEMENT GROUP LLP | Added | +795.1k |
| DIMENSIONAL FUND ADVISORS LP | Added | +750.0k |
| Roumell Asset Management, LLC | New | +542.5k |
| MILLENNIUM MANAGEMENT LLC | Added | +481.9k |
| Kopion Asset Management, LLC | Added | +424.4k |
| VOYA INVESTMENT MANAGEMENT LLC | Added | +380.8k |
Biggest sellers
| FMR LLC | Reduced | -2.9m |
| Driehaus Capital Management LLC | Reduced | -1.2m |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Reduced | -1.1m |
| G2 Investment Partners Management LLC | Sold out | -756.0k |
| CANNELL CAPITAL LLC | Sold out | -646.4k |
| Engle Capital Management, L.P. | Sold out | -622.0k |
| Lisanti Capital Growth, LLC | Sold out | -601.4k |
| CASTLEARK MANAGEMENT LLC | Sold out | -409.8k |
| iA Global Asset Management Inc. | Sold out | -356.7k |
| Granahan Investment Management, LLC | Reduced | -349.2k |
Biggest calls
| Parallax Volatility Advisers, L.P. | Added | $5.7m750.1k shares |
| GROUP ONE TRADING LLC | Reduced | $2.9m383.4k shares |
| CITADEL ADVISORS LLC | Reduced | $2.5m328.7k shares |
| SIMPLEX TRADING, LLC | Added | $2.2m297.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $2.0m266.4k shares |
| PEAK6 Investments LLC | Reduced | $1.1m149.6k shares |
| Squarepoint Ops LLC | New | $985.5k130.7k shares |
| Walleye Trading LLC | Reduced | $914.6k121.3k shares |
| HSBC HOLDINGS PLC | Added | $420.6k56.3k shares |
| GTS SECURITIES LLC | New | $383.8k50.9k shares |
Biggest puts
| Parallax Volatility Advisers, L.P. | Reduced | $19.8m2.6m shares |
| Squarepoint Ops LLC | New | $490.1k65.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $394.3k52.3k shares |
| CITADEL ADVISORS LLC | Reduced | $371.7k49.3k shares |
| SIMPLEX TRADING, LLC | Added | $301.0k40.0k shares |
| IMC-Chicago, LLC | New | $257.1k34.1k shares |
| JANE STREET GROUP, LLC | Added | $219.4k29.1k shares |
| HSBC HOLDINGS PLC | New | $157.6k21.1k shares |
| PEAK6 Investments LLC | Added | $141.8k18.8k shares |
| GROUP ONE TRADING LLC | Reduced | $96.5k12.8k 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 Q3 2023
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 |
|---|---|---|---|---|---|
| Q4 2021 | 1 | $40.4k | 1 | $450.1k | — |
| Q1 2022 | 1 | $32.0k | 1 | $141.3k | — |
| Q2 2022 | 1 | $22.5k | 1 | $207.5k | — |
| Q3 2022 | 0 | — | 0 | — | — |
| Q4 2022 | 0 | — | 1 | $868.5k | — |
| Q1 2023 | 0 | — | 2 | $1.5m | — |
| Q2 2023 | 0 | — | 9 | $2.6m | $1.6m |
| Q3 2023 | 0 | — | 9 | $2.4m | $1.4m |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-09-06 | Buonasera David Chief Technology Officer | Sold | $46.7k5.4k shares |
| 2023-08-22 | Spillane Robert F Director | Sold | $201.3k25.0k shares |
| 2023-08-16 | BARRETT MICHAEL G. CEO, director | Sold | $298.1k35.9k shares |
| 2023-08-16 | Day David Chief Financial Officer | Sold | $75.4k9.1k shares |
| 2023-08-16 | Evans Katie Seitz Chief Operating Officer | Sold | $58.5k7.0k shares |
| 2023-08-16 | Soroca Adam Lee Chief Product Officer | Sold | $56.8k6.8k shares |
| 2023-08-16 | Buckley Sean Patrick Chief Revenue Officer | Sold | $43.8k5.3k shares |
| 2023-08-16 | Saltz Aaron Chief Legal Officer | Sold | $29.9k3.6k shares |
| 2023-08-16 | Buonasera David Chief Technology Officer | Sold | $22.0k2.6k shares |
| 2023-08-16 | Gephart Brian Chief Accounting Officer | Sold | $9.5k1.1k shares |
| 2023-08-15 | BARRETT MICHAEL G. CEO, director | Sold plan | $639.0k75.0k shares |
| 2023-07-11 | BARRETT MICHAEL G. CEO, director | Sold plan | $375.5k25.0k shares |
| 2023-07-11 | Evans Katie Seitz Chief Operating Officer | Sold plan | $266.6k17.8k shares |
| 2023-07-11 | Day David Chief Financial Officer | Sold plan | $143.8k9.6k shares |
| 2023-07-03 | Buonasera David Chief Technology Officer | Sold | $89.0k6.6k 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, Q3 2023
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.00% of their portfolio | 12.4m $93.8m | Added +14.7k |
| BlackRock Inc. 0.00% of their portfolio | 9.2m $69.6m | Added +157.7k |
| Granahan Investment Management, LLC 1.94% of their portfolio | 7.2m $54.3m | Reduced -349.2k |
| Edenbrook Capital, LLC 21.42% of their portfolio | 5.8m $44.1m | Reduced -103.6k |
| DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio | 5.7m $42.9m | Added +750.0k |
| FMR LLC 0.00% of their portfolio | 4.4m $33.2m | Reduced -2.9m |
| Rubric Capital Management LP 1.27% of their portfolio | 4.0m $30.2m | Added +1.8m |
| Nine Ten Capital Management LLC 9.05% of their portfolio | 3.9m $29.6m | New |
| Bank of New York Mellon Corp 0.01% of their portfolio | 3.5m $26.0m | Reduced -34.8k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 2.9m $21.8m | Added +795.1k |
| STATE STREET CORP 0.00% of their portfolio | 2.8m $21.1m | Added +41.5k |
| KENNEDY CAPITAL MANAGEMENT LLC 0.49% of their portfolio | 2.7m $20.3m | Added +74.4k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 2.7m $20.2m | Added +110.9k |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 2.6m $19.3m | Added +146.0k |
| Burgundy Asset Management Ltd. 0.22% of their portfolio | 2.4m $17.8m | New |
| VICTORY CAPITAL MANAGEMENT INC 0.02% of their portfolio | 2.0m $15.4m | Added +15.9k |
| Parallax Volatility Advisers, L.P. 0.46% of their portfolio | 1.7m $13.0m | Added +933.3k |
| ROYCE & ASSOCIATES LP 0.13% of their portfolio | 1.6m $12.4m | Added +111.1k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 1.4m $10.2m | Added +4.7k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 1.1m $8.5m | Added +9.9k |
| Kopion Asset Management, LLC 6.91% of their portfolio | 1.0m $7.7m | Added +424.4k |
| NORDEA INVESTMENT MANAGEMENT AB 0.01% of their portfolio | 1.0m $7.7m | Added +180 |
| NORGES BANK 0.00% of their portfolio | 975.7k $7.4m | Reduced -44.5k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 959.6k $7.2m | Added +34.9k |
| Penn Capital Management Company, LLC 0.69% of their portfolio | 896.6k $6.8m | Reduced -21.5k |
| Meros Investment Management, LP 3.44% of their portfolio | 838.5k $6.3m | Added +120.8k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.05% of their portfolio | 818.9k $6.2m | Reduced -4.1k |
| Williams Jones Wealth Management, LLC. 0.09% of their portfolio | 806.3k $6.1m | Reduced -111.9k |
| Driehaus Capital Management LLC 0.08% of their portfolio | 795.2k $6.0m | Reduced -1.2m |
| NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio | 727.8k $5.5m | Reduced -212.9k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.06% of their portfolio | 703.3k $5.3m | Reduced -1.1m |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 632.8k $4.8m | Reduced -14.5k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 553.8k $4.2m | Added +263.5k |
| Roumell Asset Management, LLC 8.22% of their portfolio | 542.5k $4.1m | New |
| KING LUTHER CAPITAL MANAGEMENT CORP 0.02% of their portfolio | 537.4k $4.1m | Added +28.1k |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 525.3k $4.0m | Added +481.9k |
| S SQUARED TECHNOLOGY, LLC 2.02% of their portfolio | 495.7k $3.7m | Reduced -45.0k |
| SCOUT INVESTMENTS, INC. 0.08% of their portfolio | 479.9k $3.6m | Reduced -13.9k |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 433.6k $3.3m | Added +380.8k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 393.3k $3.0m | Reduced -215.6k |
| MORGAN STANLEY 0.00% of their portfolio | 385.6k $2.9m | Reduced -206.3k |
| Madison Asset Management, LLC 0.04% of their portfolio | 359.0k $2.7m | Added +20.1k |
| P.A.W. CAPITAL CORP 7.13% of their portfolio | 350.0k $2.6m | Reduced -50.0k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 302.9k $2.3m | New |
| FIRST TRUST ADVISORS LP 0.00% of their portfolio | 283.4k $2.1m | Added +112.0k |
| Swiss National Bank 0.00% of their portfolio | 253.4k $1.9m | Reduced -40.6k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 250.1k $1.9m | Reduced -16.0k |
| Harspring Capital Management, LLC 0.50% of their portfolio | 250.0k $1.9m | New |
| TUDOR INVESTMENT CORP ET AL 0.03% of their portfolio | 230.9k $1.7m | Added +191.6k |
| CREDIT SUISSE AG/ 0.00% of their portfolio | 229.8k $1.7m | Reduced -7.1k |
| SG Americas Securities, LLC 0.02% of their portfolio | 225.4k $1.7m | New |
| First Eagle Investment Management, LLC 0.00% of their portfolio | 225.4k $1.7m | Reduced -182.4k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 224.9k $1.7m | Added +5.0k |
| Squarepoint Ops LLC 0.01% of their portfolio | 214.6k $1.6m | Reduced -46.6k |
| Verition Fund Management LLC 0.02% of their portfolio | 193.3k $1.5m | Added +179.1k |
| WOODMONT INVESTMENT COUNSEL LLC 0.14% of their portfolio | 170.0k $1.3m | Reduced -8.2k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 162.2k $1.2m | Added +92.4k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 144.1k $1.1m | Added +552 |
| Invesco Ltd. 0.00% of their portfolio | 143.9k $1.1m | Added +11.3k |
| PERKINS CAPITAL MANAGEMENT INC 1.00% of their portfolio | 133.3k $1.0m | Unchanged |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 131.4k $990.6k | Reduced -32.0k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 130.8k $986.1k | Reduced -2.2k |
| Cerity Partners LLC 0.00% of their portfolio | 127.8k $963.8k | Added +82.5k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 127.2k $958.7k | Reduced -3.1k |
| TWO SIGMA ADVISERS, LP 0.00% of their portfolio | 127.1k $958.5k | Reduced -141.1k |
| Advisory Services Network, LLC 0.03% of their portfolio | 124.7k $940.5k | Added +10.8k |
| CITIGROUP INC 0.00% of their portfolio | 121.6k $916.7k | Reduced -80.6k |
| TWINBEECH CAPITAL LP 0.02% of their portfolio | 121.3k $914.8k | New |
| Legal & General Group Plc 0.00% of their portfolio | 119.5k $901.2k | Reduced -1.1k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 119.1k $897.9k | Reduced -20.0k |
| Manatuck Hill Partners, LLC 0.42% of their portfolio | 112.5k $848.2k | Reduced -51.0k |
| HighTower Advisors, LLC 0.00% of their portfolio | 106.4k $795.0k | Added +4.1k |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 97.0k $731.5k | Reduced -4.7k |
| Millrace Asset Group, Inc. 0.89% of their portfolio | 96.1k $724.0k | Reduced -203.5k |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 94.6k $712.9k | Added +24.6k |
| MOODY NATIONAL BANK TRUST DIVISION 0.04% of their portfolio | 92.2k $695.0k | Added +19.6k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 91.5k $690.2k | Reduced -96.0k |
| Cinctive Capital Management LP 0.04% of their portfolio | 88.9k $670.4k | New |
| STEPHENS INC /AR/ 0.01% of their portfolio | 83.2k $627.2k | Reduced -36.5k |
| GRIFFIN ASSET MANAGEMENT, INC. 0.09% of their portfolio | 82.4k $621.0k | Reduced -2.1k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 78.5k $591.9k | Reduced -331.3k |
| Assenagon Asset Management S.A. 0.00% of their portfolio | 76.3k $575.1k | New |
| MetLife Investment Management, LLC 0.00% of their portfolio | 70.7k $532.9k | Unchanged |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 70.5k $532.0k | Added +3.4k |
| GREENWOOD CAPITAL ASSOCIATES LLC 0.07% of their portfolio | 67.3k $507.1k | Reduced -873 |
| AMERICAN INTERNATIONAL GROUP, INC. 0.00% of their portfolio | 66.9k $504.1k | Added +2.4k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 66.0k $497.4k | Added +12.3k |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 64.7k $488.2k | Added +6 |
| Knights of Columbus Asset Advisors LLC 0.04% of their portfolio | 63.2k $476.3k | Unchanged |
| Ensign Peak Advisors, Inc 0.00% of their portfolio | 62.5k $471.3k | Unchanged |
| Versor Investments LP 0.09% of their portfolio | 59.5k $448.6k | New |
| JANUS HENDERSON GROUP PLC 0.00% of their portfolio | 59.1k $445.5k | Added +12 |
| Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio | 58.2k $438.6k | Unchanged |
| CIBC WORLD MARKET INC. 0.00% of their portfolio | 48.8k $368.0k | Unchanged |
| ALGERT GLOBAL LLC 0.02% of their portfolio | 48.5k $366.1k | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 48.4k $364.0k | Added +6.4k |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 46.5k $347.8k | Reduced -3.5k |
| BARCLAYS PLC 0.00% of their portfolio | 44.4k $335.1k | Reduced -6.6k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 43.2k $325.8k | Added +4.3k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.00% of their portfolio | 38.2k $288.3k | Added +200 |