Who owns MDLN (MDLN)
Which tracked institutional funds hold MDLN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MDLN company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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
The tracked-fund tape on MDLN is one-sided between 2025-Q4 and 2026-Q1: 180 added or opened and 52 trimmed or exited — on balance accumulating.
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
MDLN’s largest tracked holder by dollar value, Carlyle Group Inc., sizes it at 78.4% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 78.3pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MDLN 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 2025-Q4 and 2026-Q1, across 312 tracked filers holding MDLN, 258 increased or opened the position and 76 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 MDLN between the 2025-Q4 and 2026-Q1 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 86
- VANGUARD CAPITAL MANAGEMENT LLC$655M
- VANGUARD PORTFOLIO MANAGEMENT LLC$630M
- SurgoCap Partners LP$270M
- Egerton Capital (UK) LLP$194M
- VANGUARD FIDUCIARY TRUST CO$91M
- BANQUE PICTET & CIE SA$63M
Full exits 30
- VANGUARD GROUP INC$790M
- T. Rowe Price Investment Management, Inc.$215M
- NORGES BANK$210M
- Squarepoint Ops LLC$80M
- XN LP$63M
- D. E. Shaw & Co., Inc.$37M
Largest adds
- Invesco Ltd.$813M
- FMR LLC$510M
- Capital Research Global Investors$410M
- VIKING GLOBAL INVESTORS LP$217M
- STATE STREET CORP$173M
- Ghisallo Capital Management LLC$165M
Largest trims
- Carlyle Group Inc.$718M
- H&F Corporate Investors X, Ltd.$332M
- CITADEL ADVISORS LLC$181M
- PRICE T ROWE ASSOCIATES INC /MD/$58M
- Nuveen, LLC$39M
- CAPSTONE INVESTMENT ADVISORS, LLC$20M
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 |
|---|---|---|---|---|
| Carlyle Group Inc. trimmed | 187,083,713 | $8.3B | 28.8% | 2026-Q1 |
| H&F Corporate Investors X, Ltd. trimmed | 86,473,497 | $3.8B | 13.3% | 2026-Q1 |
| FMR LLC added | 36,342,993 | $1.6B | 5.6% | 2026-Q1 |
| Capital Research Global Investors added | 23,161,670 | $1.0B | 3.6% | 2026-Q1 |
| Invesco Ltd. added | 20,649,345 | $919M | 3.2% | 2026-Q1 |
| MORGAN STANLEY added | 15,702,903 | $699M | 2.4% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 14,729,681 | $655M | 2.3% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 14,150,752 | $630M | 2.2% | 2026-Q1 |
| LONE PINE CAPITAL LLC added | 11,789,156 | $525M | 1.8% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 11,569,316 | $518M | 1.8% | 2026-Q1 |
| VIKING GLOBAL INVESTORS LP added | 11,433,992 | $509M | 1.8% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 11,451,861 | $507M | 1.8% | 2026-Q1 |
| BlackRock, Inc. trimmed | 10,971,943 | $488M | 1.7% | 2026-Q1 |
| BAILLIE GIFFORD & CO trimmed | 9,975,775 | $444M | 1.5% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 9,356,746 | $416M | 1.4% | 2026-Q1 |
| Durable Capital Partners LP added | 7,265,853 | $323M | 1.1% | 2026-Q1 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 7,218,731 | $308M | 1.1% | 2026-Q1 |
| Artisan Partners Limited Partnership added | 6,629,443 | $295M | 1.0% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 6,258,272 | $279M | 1.0% | 2026-Q1 |
| SurgoCap Partners LP new | 6,075,165 | $270M | 0.9% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 5,610,842 | $250M | 0.9% | 2026-Q1 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 5,000,000 | $222M | 0.8% | 2026-Q1 |
| STATE STREET CORP added | 4,822,383 | $215M | 0.7% | 2026-Q1 |
| Ghisallo Capital Management LLC added | 4,546,674 | $202M | 0.7% | 2026-Q1 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main added | 4,384,729 | $195M | 0.7% | 2026-Q1 |
| Egerton Capital (UK) LLP new | 4,365,802 | $194M | 0.7% | 2026-Q1 |
| Capital World Investors added | 4,311,124 | $192M | 0.7% | 2026-Q1 |
| BESSEMER GROUP INC added | 3,504,006 | $156M | 0.5% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 3,304,305 | $147M | 0.5% | 2026-Q1 |
| UBS Group AG added | 3,191,661 | $142M | 0.5% | 2026-Q1 |
| Alyeska Investment Group, L.P. added | 2,937,389 | $131M | 0.5% | 2026-Q1 |
| SEVEN GRAND MANAGERS, LLC added | 2,500,000 | $111M | 0.4% | 2026-Q1 |
| Unisphere Establishment added | 2,482,500 | $110M | 0.4% | 2026-Q1 |
| MBB PUBLIC MARKETS I LLC | 2,441,379 | $109M | 0.4% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 2,288,251 | $102M | 0.4% | 2026-Q1 |
| EMINENCE CAPITAL, LP added | 2,279,190 | $101M | 0.4% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 2,040,266 | $91M | 0.3% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 1,996,552 | $89M | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 1,955,949 | $87M | 0.3% | 2026-Q1 |
| Burkehill Global Management, LP added | 1,950,000 | $87M | 0.3% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 1,593,358 | $71M | 0.2% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC trimmed | 1,544,538 | $69M | 0.2% | 2026-Q1 |
| Pictet Asset Management Holding SA added | 1,458,011 | $65M | 0.2% | 2026-Q1 |
| BANQUE PICTET & CIE SA new | 1,420,967 | $63M | 0.2% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 1,470,444 | $63M | 0.2% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 1,394,409 | $62M | 0.2% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC new | 1,357,563 | $60M | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO added | 1,327,179 | $59M | 0.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,319,467 | $59M | 0.2% | 2026-Q1 |
| SOROS FUND MANAGEMENT LLC trimmed | 1,286,434 | $57M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 1,268,280 | $56M | 0.2% | 2026-Q1 |
| KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC added | 1,230,744 | $55M | 0.2% | 2026-Q1 |
| NORTHERN TRUST CORP added | 1,214,981 | $54M | 0.2% | 2026-Q1 |
| Woodline Partners LP added | 1,213,076 | $54M | 0.2% | 2026-Q1 |
| BLAIR WILLIAM & CO/IL added | 1,165,430 | $52M | 0.2% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 1,138,548 | $51M | 0.2% | 2026-Q1 |
| Freestone Grove Partners LP added | 1,089,014 | $48M | 0.2% | 2026-Q1 |
| Qube Research & Technologies Ltd new | 1,057,071 | $47M | 0.2% | 2026-Q1 |
| Investment Management Corp of Ontario new | 1,013,902 | $45M | 0.2% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 990,200 | $44M | 0.2% | 2026-Q1 |
| PARNASSUS INVESTMENTS, LLC new | 988,143 | $44M | 0.2% | 2026-Q1 |
| National Pension Service | 900,000 | $40M | 0.1% | 2026-Q1 |
| Verition Fund Management LLC added | 855,570 | $38M | 0.1% | 2026-Q1 |
| Holocene Advisors, LP added | 832,316 | $37M | 0.1% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 820,317 | $37M | 0.1% | 2026-Q1 |
| MAVERICK CAPITAL LTD | 796,077 | $35M | 0.1% | 2026-Q1 |
| Bank of New York Mellon Corp added | 705,270 | $31M | 0.1% | 2026-Q1 |
| Khrom Capital Management LLC new | 703,137 | $31M | 0.1% | 2026-Q1 |
| Broad Bay Capital Management, LP new | 675,000 | $30M | 0.1% | 2026-Q1 |
| MARSHALL WACE, LLP added | 641,715 | $29M | 0.1% | 2026-Q1 |
| Longaeva Partners L.P. added | 635,000 | $28M | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 618,293 | $28M | 0.1% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 604,198 | $27M | 0.1% | 2026-Q1 |
| Nuveen, LLC trimmed | 591,217 | $26M | 0.1% | 2026-Q1 |
| ARMISTICE CAPITAL, LLC added | 564,857 | $25M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 582,203 | $25M | 0.1% | 2026-Q1 |
| National Philanthropic Trust new | 554,853 | $25M | 0.1% | 2026-Q1 |
| BlueCrest Capital Management Ltd new | 549,000 | $24M | 0.1% | 2026-Q1 |
| Lykos Global Management, LP trimmed | 525,000 | $23M | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 499,268 | $22M | 0.1% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS new | 480,327 | $21M | 0.1% | 2026-Q1 |
| NATIXIS ADVISORS, LLC added | 456,430 | $20M | 0.1% | 2026-Q1 |
| BW Gestao de Investimentos Ltda. added | 440,000 | $20M | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 439,919 | $20M | 0.1% | 2026-Q1 |
| HBK INVESTMENTS L P added | 425,000 | $19M | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 417,896 | $19M | 0.1% | 2026-Q1 |
| Walleye Capital LLC | 405,273 | $18M | 0.1% | 2026-Q1 |
| Alberta Investment Management Corp trimmed | 390,000 | $17M | 0.1% | 2026-Q1 |
| BRADLEY FOSTER & SARGENT INC/CT new | 389,457 | $17M | 0.1% | 2026-Q1 |
| Premier Fund Managers Ltd new | 386,922 | $16M | 0.1% | 2026-Q1 |
| Mawer Investment Management Ltd. added | 367,296 | $16M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC new | 18,803,164 | $790M | 2.7% | 2025-Q4 stale |
| T. Rowe Price Investment Management, Inc. new | 5,108,788 | $215M | 0.7% | 2025-Q4 stale |
| NORGES BANK new | 5,000,000 | $210M | 0.7% | 2025-Q4 stale |
| Squarepoint Ops LLC new | 1,900,000 | $80M | 0.3% | 2025-Q4 stale |
| XN LP new | 1,502,000 | $63M | 0.2% | 2025-Q4 stale |
| D. E. Shaw & Co., Inc. new | 884,500 | $37M | 0.1% | 2025-Q4 stale |
| Hudson Bay Capital Management LP new | 550,050 | $23M | 0.1% | 2025-Q4 stale |
| Dragoneer Investment Group, LLC new | 525,000 | $22M | 0.1% | 2025-Q4 stale |
| TUDOR INVESTMENT CORP ET AL new | 464,454 | $20M | 0.1% | 2025-Q4 stale |
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.