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
223
institutional holders
-7 vs Q4 2022
103.1m
shares reported held*
76.1%
of all shares outstanding*
$954.7mreported value*
34 new
73 added
67 reduced
44 sold out
net bought ≈ $91.6m (+9.9m shares)
* 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 ($903.5k this quarter). Holder counts are more reliable. Shares outstanding: 135.6m as of 2023-05-03, 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 ≈ $9.26. Options: 14 managers hold calls ($20.0m notional), 12 hold puts ($35.8m).
Trends to Q1 2023
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 218 |
| Q4 2022 | 230 |
| Q1 2023 | 223 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Bought or addedCut or sold out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2022 | 115 | 99 |
| Q1 2023 | 107 | 111 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
CallsPuts
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2022 | $11.9m | $24.7m | 2.08 |
| Q4 2022 | $21.1m | $47.2m | 2.24 |
| Q1 2023 | $20.0m | $35.8m | 1.79 |
Biggest buyers
| FMR LLC | Added | +7.5m |
| DIMENSIONAL FUND ADVISORS LP | Added | +2.4m |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Added | +1.1m |
| Penn Capital Management Company, LLC | Added | +801.9k |
| NORDEA INVESTMENT MANAGEMENT AB | Added | +757.0k |
| JPMORGAN CHASE & CO | Added | +607.3k |
| Driehaus Capital Management LLC | New | +502.6k |
| VICTORY CAPITAL MANAGEMENT INC | Added | +465.7k |
| NEW YORK STATE COMMON RETIREMENT FUND | Added | +445.6k |
| Invesco Ltd. | Added | +392.7k |
Biggest sellers
| Nine Ten Capital Management LLC | Sold out | -1.3m |
| Granahan Investment Management, LLC | Reduced | -1.3m |
| Builders Union LLP | Sold out | -1.2m |
| Nuveen Asset Management, LLC | Reduced | -744.4k |
| Lisanti Capital Growth, LLC | Sold out | -375.0k |
| Parallax Volatility Advisers, L.P. | Reduced | -363.5k |
| MORGAN STANLEY | Reduced | -351.2k |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | -238.2k |
| Manatuck Hill Partners, LLC | Reduced | -224.0k |
| Roumell Asset Management, LLC | Sold out | -201.6k |
Biggest calls
| Parallax Volatility Advisers, L.P. | Added | $8.0m862.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $2.4m259.9k shares |
| Balyasny Asset Management L.P. | New | $2.3m250.0k shares |
| CITADEL ADVISORS LLC | Reduced | $2.3m248.9k shares |
| GROUP ONE TRADING LLC | Reduced | $1.9m209.6k shares |
| SIMPLEX TRADING, LLC | Reduced | $676.0k73.1k shares |
| JANE STREET GROUP, LLC | Reduced | $661.2k71.4k shares |
| Shay Capital LLC | New | $574.1k62.0k shares |
| PEAK6 Investments LLC | Added | $553.7k59.8k shares |
| WOLVERINE TRADING, LLC | New | $299.0k33.1k shares |
Biggest puts
| Parallax Volatility Advisers, L.P. | Reduced | $31.1m3.4m shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $1.5m166.9k shares |
| CITADEL ADVISORS LLC | Added | $1.3m137.7k shares |
| Walleye Trading LLC | Added | $476.9k51.5k shares |
| GROUP ONE TRADING LLC | Added | $413.9k44.7k shares |
| SIMPLEX TRADING, LLC | Added | $408.0k44.1k shares |
| PEAK6 Investments LLC | Added | $307.4k33.2k shares |
| JANE STREET GROUP, LLC | Reduced | $152.8k16.5k shares |
| WOLVERINE TRADING, LLC | New | $146.0k16.2k shares |
| JPMORGAN CHASE & CO | New | $5.0k500 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 Q1 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)
BuyingSelling
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q2 2021 | 0 | — | 0 | — | — |
| Q3 2021 | 0 | — | 0 | — | — |
| 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 | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-03-15 | BARRETT MICHAEL G. CEO, director | Sold | $629.2k75.0k shares |
| 2023-03-01 | Evans Katie Seitz Chief Operating Officer | Sold | $858.9k78.2k 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, Q1 2023
| Manager | Shares | Change |
|---|---|---|
| FMR LLC 0.01% of their portfolio | 13.6m $126.0m | Added +7.5m |
| VANGUARD GROUP INC 0.00% of their portfolio | 12.5m $115.4m | Added +28.4k |
| Granahan Investment Management, LLC 2.57% of their portfolio | 9.1m $84.6m | Reduced -1.3m |
| BlackRock Inc. 0.00% of their portfolio | 8.9m $82.0m | Added +5.3k |
| Edenbrook Capital, LLC 23.46% of their portfolio | 6.9m $63.8m | Unchanged |
| DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio | 4.2m $39.1m | Added +2.4m |
| Bank of New York Mellon Corp 0.01% of their portfolio | 3.8m $35.3m | Added +328.2k |
| STATE STREET CORP 0.00% of their portfolio | 2.7m $25.3m | Added +49.4k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.26% of their portfolio | 2.7m $24.8m | Added +1.1m |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 2.5m $22.8m | Added +95.6k |
| Nuveen Asset Management, LLC 0.01% of their portfolio | 2.3m $21.5m | Reduced -744.4k |
| VICTORY CAPITAL MANAGEMENT INC 0.02% of their portfolio | 1.7m $16.0m | Added +465.7k |
| KENNEDY CAPITAL MANAGEMENT LLC 0.44% of their portfolio | 1.6m $15.0m | Reduced -1.2k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 1.6m $14.9m | Added +120.7k |
| ROYCE & ASSOCIATES LP 0.14% of their portfolio | 1.5m $14.2m | Added +183.5k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 1.2m $11.4m | Added +8.4k |
| Parallax Volatility Advisers, L.P. 0.38% of their portfolio | 1.2m $10.9m | Reduced -363.5k |
| NORGES BANK 0.00% of their portfolio | 1.1m $10.2m | Reduced -86.4k |
| NORDEA INVESTMENT MANAGEMENT AB 0.01% of their portfolio | 1.0m $9.6m | Added +757.0k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 907.1k $8.4m | Added +1.1k |
| Kopion Asset Management, LLC 6.98% of their portfolio | 866.4k $8.0m | Added +80.1k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 864.9k $8.0m | Added +225.0k |
| Williams Jones Wealth Management, LLC. 0.12% of their portfolio | 820.0k $7.6m | Added +83.4k |
| Penn Capital Management Company, LLC 0.76% of their portfolio | 817.9k $7.6m | Added +801.9k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 748.0k $6.9m | Added +22.5k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 739.4k $6.8m | Added +607.3k |
| RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio | 718.1k $6.6m | Reduced -238.2k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio | 704.9k $6.5m | Added +445.6k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.05% of their portfolio | 702.4k $6.5m | Added +64.4k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 647.3k $6.0m | Reduced -4.3k |
| Meros Investment Management, LP 3.28% of their portfolio | 623.3k $5.8m | Added +41.1k |
| MORGAN STANLEY 0.00% of their portfolio | 549.2k $5.1m | Reduced -351.2k |
| S SQUARED TECHNOLOGY, LLC 2.94% of their portfolio | 534.1k $4.9m | Added +85.0k |
| SCOUT INVESTMENTS, INC. 0.10% of their portfolio | 508.6k $4.7m | Reduced -5.8k |
| CANNELL CAPITAL LLC 0.91% of their portfolio | 506.9k $4.7m | Added +175.1k |
| Driehaus Capital Management LLC 0.07% of their portfolio | 502.6k $4.7m | New |
| KING LUTHER CAPITAL MANAGEMENT CORP 0.02% of their portfolio | 502.3k $4.7m | Reduced -2.7k |
| Invesco Ltd. 0.00% of their portfolio | 493.3k $4.6m | Added +392.7k |
| P.A.W. CAPITAL CORP 8.99% of their portfolio | 440.0k $4.1m | Reduced -40.0k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 364.2k $3.4m | Added +194.4k |
| Madison Asset Management, LLC 0.05% of their portfolio | 338.3k $3.1m | Added +59.3k |
| TWO SIGMA ADVISERS, LP 0.01% of their portfolio | 324.1k $3.0m | Added +21.6k |
| FRED ALGER MANAGEMENT, LLC 0.01% of their portfolio | 279.3k $2.6m | Reduced -57.9k |
| CASTLEARK MANAGEMENT LLC 0.13% of their portfolio | 277.8k $2.6m | Added +91.0k |
| CITIGROUP INC 0.00% of their portfolio | 268.6k $2.5m | Reduced -94.7k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 268.4k $2.5m | Reduced -2.2k |
| First Eagle Investment Management, LLC 0.01% of their portfolio | 260.3k $2.4m | Reduced -135.1k |
| Swiss National Bank 0.00% of their portfolio | 259.1k $2.4m | Reduced -29.8k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 245.9k $2.3m | New |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 235.3k $2.2m | Added +6.3k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 231.4k $2.1m | New |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 196.8k $1.8m | Added +133.3k |
| STEPHENS INC /AR/ 0.03% of their portfolio | 194.8k $1.8m | Reduced -48.4k |
| TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio | 192.3k $1.8m | Added +95.2k |
| PRELUDE CAPITAL MANAGEMENT, LLC 0.12% of their portfolio | 191.4k $1.8m | Added +84.1k |
| Avalon Investment & Advisory 0.05% of their portfolio | 183.9k $1.7m | Reduced -65.0k |
| Jump Financial, LLC 0.07% of their portfolio | 174.4k $1.6m | Added +73.9k |
| WOODMONT INVESTMENT COUNSEL LLC 0.17% of their portfolio | 172.9k $1.6m | Reduced -19.8k |
| State of New Jersey Common Pension Fund D 0.01% of their portfolio | 171.3k $1.6m | New |
| Manatuck Hill Partners, LLC 0.77% of their portfolio | 163.5k $1.5m | Reduced -224.0k |
| SG Americas Securities, LLC 0.02% of their portfolio | 159.7k $1.5m | Added +132.6k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 154.7k $1.4m | Reduced -2.2k |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.01% of their portfolio | 151.7k $1.4m | Reduced -120 |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 151.7k $1.4m | Reduced -27.1k |
| Lapides Asset Management, LLC 0.85% of their portfolio | 150.7k $1.4m | New |
| PERKINS CAPITAL MANAGEMENT INC 1.16% of their portfolio | 133.3k $1.2m | Reduced -2.8k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 130.3k $1.2m | Unchanged |
| Advisory Services Network, LLC 0.03% of their portfolio | 114.1k $1.1m | Added +258 |
| Legal & General Group Plc 0.00% of their portfolio | 113.5k $1.1m | Added +5.2k |
| HighTower Advisors, LLC 0.00% of their portfolio | 110.7k $1.0m | Reduced -681 |
| Millrace Asset Group, Inc. 1.18% of their portfolio | 108.7k $1.0m | Reduced -56.0k |
| CREDIT SUISSE AG/ 0.00% of their portfolio | 106.9k $990.2k | Reduced -1.7k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 106.8k $989.4k | Reduced -12.0k |
| AJ WEALTH STRATEGIES, LLC 0.05% of their portfolio | 100.0k $926.0k | Unchanged |
| CM WEALTH ADVISORS LLC 0.15% of their portfolio | 84.7k $755.0k | New |
| GRIFFIN ASSET MANAGEMENT, INC. 0.11% of their portfolio | 84.5k $782.1k | Reduced -38.1k |
| UBS Group AG 0.00% of their portfolio | 82.4k $762.9k | Added +1.7k |
| ClariVest Asset Management LLC 0.03% of their portfolio | 81.7k $757.0k | Reduced -13.9k |
| GSA CAPITAL PARTNERS LLP 0.07% of their portfolio | 81.4k $753.0k | New |
| MOODY NATIONAL BANK TRUST DIVISION 0.06% of their portfolio | 80.0k $740.4k | Added +14.6k |
| Quantbot Technologies LP 0.05% of their portfolio | 77.2k $715.3k | New |
| Dynamic Technology Lab Private Ltd 0.07% of their portfolio | 76.2k $706.0k | Added +46.4k |
| MetLife Investment Management, LLC 0.00% of their portfolio | 69.7k $645.3k | Unchanged |
| GREENWOOD CAPITAL ASSOCIATES LLC 0.09% of their portfolio | 69.4k $642.6k | Reduced -14.8k |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 67.9k $628.9k | Reduced -26.8k |
| BARCLAYS PLC 0.00% of their portfolio | 67.2k $622.5k | Added +31.7k |
| AMERICAN INTERNATIONAL GROUP, INC. 0.00% of their portfolio | 63.9k $591.5k | Added +1.3k |
| Knights of Columbus Asset Advisors LLC 0.06% of their portfolio | 63.2k $584.9k | Unchanged |
| Ensign Peak Advisors, Inc 0.00% of their portfolio | 62.5k $578.8k | Added +150 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.00% of their portfolio | 61.9k $572.8k | Added +20.4k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 61.7k $572.0k | Added +1.9k |
| JANUS HENDERSON GROUP PLC 0.00% of their portfolio | 59.2k $547.8k | Added +36.8k |
| Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio | 58.2k $538.6k | Unchanged |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 53.2k $492.0k | Reduced -53.0k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 53.0k $491.1k | Reduced -47.8k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 52.9k $489.5k | Added +1.9k |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 50.4k $466.7k | Unchanged |
| CIBC WORLD MARKET INC. 0.00% of their portfolio | 48.8k $452.0k | Unchanged |
| GREAT LAKES ADVISORS, LLC 0.00% of their portfolio | 47.0k $434.9k | Added +237 |
| TUDOR INVESTMENT CORP ET AL 0.01% of their portfolio | 46.1k $427.0k | Reduced -143.9k |