Who owns MRLN
Which tracked institutional funds hold MRLN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MRLN company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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 MRLN is one-sided between 2025-Q4 and 2026-Q1: 5 added or opened and 38 trimmed or exited — on balance reducing.
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
MRLN’s largest tracked holder by dollar value, HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND, 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 MRLN 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 29 tracked filers holding MRLN, 20 increased or opened the position and 50 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 MRLN 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 3
- BAILLIE GIFFORD & CO$15M
- CONTINENTAL GENERAL INSURANCE CO$2M
- Greenhaven Road Investment Management, L.P.$796K
Full exits 30
- HIGHBRIDGE CAPITAL MANAGEMENT LLC$22M
- Governors Lane LP$11M
- Harraden Circle Investments, LLC$10M
- AQR Arbitrage LLC$10M
- Decagon Asset Management LLP$9M
- Linden Advisors LP$8M
Largest adds
- UBS Group AG$2M
- Diametric Capital, LP$476K
Largest trims
- D. E. Shaw & Co., Inc.$13M
- Alberta Investment Management Corp$7M
- MOORE CAPITAL MANAGEMENT, LP$6M
- DLD Asset Management, LP$5M
- Magnetar Financial LLC$3M
- GOLDMAN SACHS GROUP INC$2M
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 |
|---|---|---|---|---|
| HIGHBRIDGE CAPITAL MANAGEMENT LLC new | 2,011,897 | $22M | 9.0% | 2025-Q4 |
| BAILLIE GIFFORD & CO new | 2,016,289 | $15M | 6.2% | 2026-Q1 |
| Governors Lane LP added | 1,000,700 | $11M | 4.5% | 2025-Q4 |
| Harraden Circle Investments, LLC new | 955,646 | $10M | 4.3% | 2025-Q4 |
| AQR Arbitrage LLC trimmed | 920,621 | $10M | 4.1% | 2025-Q4 |
| Decagon Asset Management LLP new | 816,410 | $9M | 3.6% | 2025-Q4 |
| Linden Advisors LP | 750,000 | $8M | 3.3% | 2025-Q4 |
| BERKLEY W R CORP trimmed | 633,772 | $7M | 2.8% | 2025-Q4 |
| LMR Partners LLP trimmed | 600,000 | $6M | 2.7% | 2025-Q4 |
| First Trust Capital Management L.P. trimmed | 573,278 | $6M | 2.6% | 2025-Q4 |
| Radcliffe Capital Management, L.P. trimmed | 521,028 | $6M | 2.3% | 2025-Q4 |
| Mercuria Capital Strategies, LLC new | 535,000 | $5M | 2.3% | 2025-Q4 |
| RIVERNORTH CAPITAL MANAGEMENT, LLC trimmed | 499,513 | $5M | 2.2% | 2025-Q4 |
| TENOR CAPITAL MANAGEMENT Co., L.P. trimmed | 490,945 | $5M | 2.2% | 2025-Q4 |
| Hudson Bay Capital Management LP trimmed | 432,943 | $5M | 1.9% | 2025-Q4 |
| PICTON MAHONEY ASSET MANAGEMENT trimmed | 420,928 | $5M | 1.9% | 2025-Q4 |
| Shay Capital LLC new | 404,403 | $4M | 1.8% | 2025-Q4 |
| FNY Investment Advisers, LLC new | 383,975 | $4M | 1.7% | 2025-Q4 |
| Lineage Point Capital LP new | 376,205 | $4M | 1.7% | 2025-Q4 |
| ExodusPoint Capital Management, LP added | 343,847 | $3M | 1.1% | 2026-Q1 |
| METEORA CAPITAL, LLC trimmed | 215,606 | $2M | 1.0% | 2025-Q4 |
| GRITSTONE ASSET MANAGEMENT LLC | 196,794 | $2M | 0.9% | 2025-Q4 |
| UBS Group AG added | 273,086 | $2M | 0.8% | 2026-Q1 |
| CONTINENTAL GENERAL INSURANCE CO trimmed | 239,872 | $2M | 0.7% | 2026-Q1 |
| Shaolin Capital Management LLC trimmed | 150,000 | $2M | 0.7% | 2025-Q4 |
| Periscope Capital Inc. trimmed | 150,000 | $2M | 0.7% | 2025-Q4 |
| BCK CAPITAL MANAGEMENT LP added | 144,322 | $2M | 0.6% | 2025-Q4 |
| RAYMOND JAMES FINANCIAL INC new | 134,458 | $1M | 0.6% | 2025-Q4 |
| WEXFORD CAPITAL LP new | 100,000 | $1M | 0.4% | 2025-Q4 |
| Cannon Global Investment Management, LLC new | 88,500 | $949K | 0.4% | 2025-Q4 |
| Diametric Capital, LP added | 124,624 | $916K | 0.4% | 2026-Q1 |
| T3 Companies, LLC new | 82,100 | $880K | 0.4% | 2025-Q4 |
| Westchester Capital Management, LLC trimmed | 74,595 | $800K | 0.3% | 2025-Q4 |
| Greenhaven Road Investment Management, L.P. new | 108,233 | $796K | 0.3% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 78,709 | $579K | 0.2% | 2026-Q1 |
| SkyView Investment Advisors, LLC new | 51,797 | $555K | 0.2% | 2025-Q4 |
| Alberta Investment Management Corp trimmed | 75,000 | $551K | 0.2% | 2026-Q1 |
| MOORE CAPITAL MANAGEMENT, LP trimmed | 75,000 | $551K | 0.2% | 2026-Q1 |
| Private Advisor Group, LLC new | 50,291 | $539K | 0.2% | 2025-Q4 |
| Mirae Asset Global Investments Co., Ltd. trimmed | 43,700 | $468K | 0.2% | 2025-Q4 |
| Clear Street Group Inc. trimmed | 42,499 | $456K | 0.2% | 2025-Q4 |
| JANE STREET GROUP, LLC added | 52,438 | $385K | 0.2% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 50,005 | $368K | 0.2% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 50,000 | $368K | 0.2% | 2026-Q1 |
| Qube Research & Technologies Ltd new | 27,657 | $296K | 0.1% | 2025-Q4 |
| DLD Asset Management, LP trimmed | 36,762 | $270K | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 24,864 | $267K | 0.1% | 2025-Q4 |
| SAGE ADVISORS, LLC new | 23,135 | $248K | 0.1% | 2025-Q4 |
| TORONTO DOMINION BANK trimmed | 32,678 | $240K | 0.1% | 2026-Q1 |
| Board of Trustees of The Leland Stanford Junior University new | 32,668 | $240K | 0.1% | 2026-Q1 |
| Magnetar Financial LLC trimmed | 30,688 | $226K | 0.1% | 2026-Q1 |
| XTX Topco Ltd new | 29,708 | $218K | 0.1% | 2026-Q1 |
| HRT FINANCIAL LP new | 29,515 | $216K | 0.1% | 2026-Q1 |
| Bulldog Investors, LLP trimmed | 17,684 | $190K | 0.1% | 2025-Q4 |
| ROBINSON CAPITAL MANAGEMENT, LLC | 15,250 | $163K | 0.1% | 2025-Q4 |
| PFG Investments, LLC new | 15,000 | $161K | 0.1% | 2025-Q4 |
| READYSTATE ASSET MANAGEMENT LP trimmed | 13,133 | $141K | 0.1% | 2025-Q4 |
| PRELUDE CAPITAL MANAGEMENT, LLC new | 10,211 | $109K | 0.0% | 2025-Q4 |
| GRIFFIN ASSET MANAGEMENT, INC. added | 14,135 | $104K | 0.0% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ new | 11,466 | $84K | 0.0% | 2026-Q1 |
| MORGAN STANLEY added | 5,684 | $42K | 0.0% | 2026-Q1 |
| OSAIC HOLDINGS, INC. trimmed | 2,120 | $16K | 0.0% | 2026-Q1 |
| Allworth Financial LP | 1,090 | $8K | 0.0% | 2026-Q1 |
| Rockefeller Capital Management L.P. new | 600 | $4K | 0.0% | 2026-Q1 |
| Hurley Capital, LLC new | 454 | $3K | 0.0% | 2026-Q1 |
| Caitong International Asset Management Co., Ltd new | 308 | $3K | 0.0% | 2025-Q4 |
| CWM, LLC new | 410 | $3K | 0.0% | 2026-Q1 |
| ROYAL BANK OF CANADA new | 100 | $1K | 0.0% | 2026-Q1 |
| Archer Investment Corp new | 120 | $882 | 0.0% | 2026-Q1 |
| ORG Partners LLC new | 80 | $857 | 0.0% | 2025-Q4 |
| Ascentis Independent Advisors new | 80 | $588 | 0.0% | 2026-Q1 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND new | 2,475,000 | $25M | 10.3% | 2025-Q1 stale |
| Polar Asset Management Partners Inc. | 750,000 | $8M | 3.2% | 2025-Q3 stale |
| TWO SIGMA INVESTMENTS, LP | 625,000 | $6M | 2.7% | 2025-Q3 stale |
| Ghisallo Capital Management LLC | 500,000 | $5M | 2.2% | 2025-Q3 stale |
| WOLVERINE ASSET MANAGEMENT LLC trimmed | 341,697 | $4M | 1.5% | 2025-Q3 stale |
| MIZUHO SECURITIES USA LLC new | 281,277 | $3M | 1.2% | 2025-Q1 stale |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 200,000 | $2M | 0.9% | 2025-Q3 stale |
| Wealthspring Capital LLC new | 175,560 | $2M | 0.8% | 2025-Q2 stale |
| Karpus Management, Inc. trimmed | 122,880 | $1M | 0.5% | 2025-Q3 stale |
| GLAZER CAPITAL, LLC added | 100,000 | $1M | 0.4% | 2025-Q3 stale |
| CANTOR FITZGERALD, L. P. new | 100,000 | $1M | 0.4% | 2025-Q2 stale |
| MIZUHO SECURITIES USA LLC trimmed | 96,894 | $993K | 0.4% | 2025-Q3 stale |
| Quarry LP trimmed | 87,500 | $910K | 0.4% | 2025-Q3 stale |
| Sandia Investment Management LP new | 87,500 | $910K | 0.4% | 2025-Q3 stale |
| Schonfeld Strategic Advisors LLC trimmed | 80,000 | $825K | 0.3% | 2025-Q2 stale |
| Centiva Capital, LP | 76,400 | $789K | 0.3% | 2025-Q2 stale |
| CLEAR STREET LLC added | 50,038 | $516K | 0.2% | 2025-Q2 stale |
| Virtu Financial LLC trimmed | 34,656 | $358K | 0.1% | 2025-Q2 stale |
| CITADEL ADVISORS LLC new | 11,073 | $114K | 0.0% | 2025-Q2 stale |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 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.