Who owns Magnachip Semiconductor (MX)
Which tracked institutional funds hold MX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MX company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
25 tracked funds added or opened MX while 13 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MX’s largest tracked holder by dollar value, MARSHALL WACE, LLP, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 70 tracked filers holding MX, 43 increased or opened the position and 45 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MX between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 5
- Qube Research & Technologies Ltd$2M
- Trexquant Investment LP$1M
- XTX Topco Ltd$1M
- Caption Management, LLC$757K
- BLUEFIN CAPITAL MANAGEMENT, LLC$699K
Full exits 11
- AMERIPRISE FINANCIAL INC$4M
- IMMERSION CORP$4M
- Clearline Capital LP$3M
- FIRST WILSHIRE SECURITIES MANAGEMENT INC$2M
- Cygnus Capital Advisors, LLC$2M
- ACADIAN ASSET MANAGEMENT LLC$2M
Largest adds
- D. E. Shaw & Co., Inc.$6M
- TWO SIGMA INVESTMENTS, LP$6M
- MARSHALL WACE, LLP$4M
- RENAISSANCE TECHNOLOGIES LLC$3M
- FourWorld Capital Management LLC$3M
- Connor, Clark & Lunn Investment Management Ltd.$2M
Largest trims
- OAKTREE CAPITAL MANAGEMENT LP$885K
- BRIDGEWAY CAPITAL MANAGEMENT, LLC$437K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| MARSHALL WACE, LLP added | 1,615,488 | $8M | 7.3% | 2026-Q2 |
| FourWorld Capital Management LLC trimmed | 1,600,695 | $8M | 7.2% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 1,501,438 | $7M | 6.8% | 2026-Q2 |
| OAKTREE CAPITAL MANAGEMENT LP trimmed | 1,500,000 | $7M | 6.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 1,397,759 | $7M | 6.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 661,600 | $3M | 3.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 544,125 | $3M | 2.5% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 475,648 | $2M | 2.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 412,849 | $2M | 1.9% | 2026-Q2 |
| Qube Research & Technologies Ltd new | 382,383 | $2M | 1.7% | 2026-Q2 |
| Trexquant Investment LP added | 285,909 | $1M | 1.3% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 265,146 | $1M | 1.2% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 239,694 | $1M | 1.1% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 236,422 | $1M | 1.1% | 2026-Q2 |
| XTX Topco Ltd added | 222,197 | $1M | 1.0% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 215,877 | $1M | 1.0% | 2026-Q2 |
| ODDO BHF ASSET MANAGEMENT SAS | 215,098 | $1M | 1.0% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 200,081 | $946K | 0.9% | 2026-Q2 |
| Caption Management, LLC trimmed | 160,090 | $757K | 0.7% | 2026-Q2 |
| Steward Partners Investment Advisory, LLC trimmed | 153,347 | $725K | 0.7% | 2026-Q2 |
| BLUEFIN CAPITAL MANAGEMENT, LLC new | 147,698 | $699K | 0.7% | 2026-Q2 |
| GROUP ONE TRADING LLC added | 117,823 | $557K | 0.5% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 111,043 | $525K | 0.5% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 110,785 | $524K | 0.5% | 2026-Q2 |
| UBS Group AG trimmed | 110,336 | $522K | 0.5% | 2026-Q2 |
| Federation des caisses Desjardins du Quebec added | 108,474 | $513K | 0.5% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 108,103 | $511K | 0.5% | 2026-Q2 |
| SILVERBACK ASSET MANAGEMENT LLC trimmed | 100,000 | $473K | 0.5% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 95,843 | $453K | 0.4% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL new | 75,103 | $355K | 0.3% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 73,701 | $349K | 0.3% | 2026-Q2 |
| IMC-Chicago, LLC new | 67,909 | $321K | 0.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 67,450 | $319K | 0.3% | 2026-Q2 |
| FAIRFAX FINANCIAL HOLDINGS LTD/ CAN trimmed | 62,500 | $296K | 0.3% | 2026-Q2 |
| BARCLAYS PLC added | 60,000 | $284K | 0.3% | 2026-Q2 |
| Eurizon Capital SGR S.p.A. trimmed | 60,955 | $282K | 0.3% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 46,141 | $218K | 0.2% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 38,588 | $178K | 0.2% | 2026-Q2 |
| WINTON GROUP Ltd new | 34,678 | $164K | 0.2% | 2026-Q2 |
| Yakira Capital Management, Inc. trimmed | 34,675 | $164K | 0.2% | 2026-Q2 |
| WESBANCO BANK INC new | 30,000 | $142K | 0.1% | 2026-Q2 |
| STATE STREET CORP added | 28,692 | $136K | 0.1% | 2026-Q2 |
| Tower Research Capital LLC (TRC) added | 27,646 | $131K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 23,206 | $110K | 0.1% | 2026-Q2 |
| GABELLI & Co INVESTMENT ADVISERS, INC. trimmed | 22,505 | $106K | 0.1% | 2026-Q2 |
| GABELLI FUNDS LLC trimmed | 21,670 | $102K | 0.1% | 2026-Q2 |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC new | 19,066 | $90K | 0.1% | 2026-Q2 |
| AXQ CAPITAL, LP trimmed | 18,212 | $86K | 0.1% | 2026-Q2 |
| LPL Financial LLC added | 17,685 | $84K | 0.1% | 2026-Q2 |
| FOX RUN MANAGEMENT, L.L.C. new | 16,461 | $78K | 0.1% | 2026-Q2 |
| Owlhouse Capital LP new | 13,140 | $62K | 0.1% | 2026-Q2 |
| Caitong International Asset Management Co., Ltd added | 13,092 | $62K | 0.1% | 2026-Q2 |
| Accurate Wealth Management, LLC new | 15,000 | $60K | 0.1% | 2026-Q2 |
| StoneX Group Inc. new | 10,625 | $57K | 0.1% | 2026-Q2 |
| C2P Capital Advisory Group, LLC d.b.a. Prosperity Capital Advisors new | 11,475 | $54K | 0.1% | 2026-Q2 |
| Centiva Capital, LP trimmed | 10,573 | $50K | 0.0% | 2026-Q2 |
| Walleye Capital LLC trimmed | 10,521 | $50K | 0.0% | 2026-Q2 |
| Rockefeller Capital Management L.P. new | 10,000 | $47K | 0.0% | 2026-Q2 |
| OSAIC HOLDINGS, INC. | 7,193 | $34K | 0.0% | 2026-Q2 |
| NFSG Corp added | 5,925 | $28K | 0.0% | 2026-Q2 |
| SIMPLEX TRADING, LLC added | 3,225 | $15K | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. added | 2,296 | $11K | 0.0% | 2026-Q2 |
| NewEdge Advisors, LLC trimmed | 1,000 | $5K | 0.0% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP | 1,000 | $5K | 0.0% | 2026-Q2 |
| Ameritas Advisory Services, LLC added | 946 | $4K | 0.0% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 688 | $3K | 0.0% | 2026-Q2 |
| TD Waterhouse Canada Inc. new | 500 | $2K | 0.0% | 2026-Q2 |
| SALEM INVESTMENT COUNSELORS INC | 300 | $1K | 0.0% | 2026-Q2 |
| Integrated Wealth Concepts LLC new | 250 | $1K | 0.0% | 2026-Q2 |
| FMR LLC | 37 | $175 | 0.0% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 1,583,589 | $4M | 4.2% | 2026-Q1 stale (1 quarter behind) |
| IMMERSION CORP trimmed | 1,383,402 | $4M | 3.7% | 2026-Q1 stale (1 quarter behind) |
| Clearline Capital LP trimmed | 1,114,590 | $3M | 3.0% | 2026-Q1 stale (1 quarter behind) |
| FIRST WILSHIRE SECURITIES MANAGEMENT INC added | 743,953 | $2M | 2.0% | 2026-Q1 stale (1 quarter behind) |
| Cygnus Capital Advisors, LLC added | 733,954 | $2M | 2.0% | 2026-Q1 stale (1 quarter behind) |
| ACADIAN ASSET MANAGEMENT LLC added | 646,684 | $2M | 1.7% | 2026-Q1 stale (1 quarter behind) |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 557,617 | $2M | 1.5% | 2026-Q1 stale (1 quarter behind) |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 403,627 | $1M | 1.1% | 2026-Q1 stale (1 quarter behind) |
| Potomac Capital Management, Inc. trimmed | 365,000 | $1M | 1.0% | 2026-Q1 stale (1 quarter behind) |
| GSA CAPITAL PARTNERS LLP added | 280,659 | $786K | 0.8% | 2026-Q1 stale (1 quarter behind) |
| BlackRock, Inc. | 208,592 | $584K | 0.6% | 2026-Q1 stale (1 quarter behind) |
| Point72 Asset Management, L.P. added | 94,209 | $264K | 0.3% | 2026-Q1 stale (1 quarter behind) |
| Polunin Capital Partners Ltd trimmed | 57,011 | $164K | 0.2% | 2026-Q1 stale (1 quarter behind) |
| ALTFEST L J & CO INC | 47,809 | $134K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| Lepercq De Neuflize Asset Management LLC added | 2,694,527 | $7M | 6.6% | 2025-Q4 stale (2 quarters behind) |
| TWO SIGMA ADVISERS, LP trimmed | 237,938 | $607K | 0.6% | 2025-Q4 stale (2 quarters behind) |
| KENNEDY CAPITAL MANAGEMENT LLC added | 106,804 | $272K | 0.3% | 2025-Q4 stale (2 quarters behind) |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 101,907 | $260K | 0.2% | 2025-Q4 stale (2 quarters behind) |
| Quinn Opportunity Partners LLC | 730,468 | $2M | 2.2% | 2025-Q3 stale (3 quarters behind) |
| S Squared Technology, LLC trimmed | 510,514 | $2M | 1.5% | 2025-Q3 stale (3 quarters behind) |
| SYSTEMATIC FINANCIAL MANAGEMENT LP trimmed | 197,446 | $618K | 0.6% | 2025-Q3 stale (3 quarters behind) |
| BCK Capital Management LP trimmed | 68,876 | $216K | 0.2% | 2025-Q3 stale (3 quarters behind) |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 54,831 | $172K | 0.2% | 2025-Q3 stale (3 quarters behind) |
| Invesco Ltd. trimmed | 41,760 | $131K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| PFG Investments, LLC added | 34,250 | $107K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| Cubist Systematic Strategies, LLC trimmed | 29,676 | $93K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| Orion Porfolio Solutions, LLC added | 321,879 | $776K | 0.7% | 2025-Q2 stale (4 quarters behind) |
| Empowered Funds, LLC | 24,141 | $96K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| CANANDAIGUA NATIONAL BANK & TRUST CO added | 19,216 | $76K | 0.1% | 2025-Q2 stale (4 quarters behind) |
1 parent filing withheld from the table above, and from the coverage figures, to avoid listing one book twice: VANGUARD GROUP INC (last filed 2025-Q4, 239,694 shares) reconciles to its 1 current affiliate (239,694 shares) — 0.000% apart.
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.