Who owns MNTN Inc. (MNTN)
Which tracked institutional funds hold MNTN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MNTN 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
20 tracked funds added or opened MNTN while 38 trimmed or exited it between 2025-Q4 and 2026-Q1 — 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
MNTN’s largest tracked holder by dollar value, MERCATO PARTNERS GROWTH III GP, LLC, sizes it at 100.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 100.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MNTN 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 94 tracked filers holding MNTN, 66 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 MNTN 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 8
- Mercato Management Legacy, LLC$54M
- VANGUARD CAPITAL MANAGEMENT LLC$13M
- AMERICAN FINANCIAL GROUP INC$5M
- D. E. Shaw & Co., Inc.$4M
- Proem Advisors LLC$3M
- Militia Capital Management LLC$2M
Full exits 16
- MERCATO PARTNERS GROWTH III GP, LLC$114M
- Bienville Capital Management, LLC$11M
- AMERIPRISE FINANCIAL INC$8M
- VANGUARD GROUP INC$7M
- BANK OF MONTREAL /CAN/$3M
- Freestone Grove Partners LP$2M
Largest adds
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$4M
- MARSHALL WACE, LLP$2M
- Qube Research & Technologies Ltd$1M
- Engineers Gate Manager LP$1M
- MILLENNIUM MANAGEMENT LLC$876K
- Man Group plc$869K
Largest trims
- BlackRock, Inc.$26M
- WELLINGTON MANAGEMENT GROUP LLP$14M
- FMR LLC$9M
- JANE STREET GROUP, LLC$7M
- GREYCROFT LP$6M
- JPMORGAN CHASE & CO$3M
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 |
|---|---|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP added | 6,195,398 | $55M | 10.4% | 2026-Q1 |
| Mercato Management Legacy, LLC new | 6,168,022 | $54M | 10.3% | 2026-Q1 |
| FMR LLC added | 2,824,886 | $25M | 4.7% | 2026-Q1 |
| GREYCROFT LP | 2,061,643 | $18M | 3.4% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,437,385 | $13M | 2.4% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 783,760 | $7M | 1.3% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 690,000 | $6M | 1.2% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 646,217 | $6M | 1.1% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 632,097 | $6M | 1.1% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 630,719 | $6M | 1.1% | 2026-Q1 |
| AMERICAN FINANCIAL GROUP INC new | 579,683 | $5M | 1.0% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 505,338 | $4M | 0.8% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 484,294 | $4M | 0.8% | 2026-Q1 |
| D. E. Shaw & Co., Inc. new | 476,087 | $4M | 0.8% | 2026-Q1 |
| Mariner, LLC added | 361,290 | $3M | 0.6% | 2026-Q1 |
| Proem Advisors LLC new | 325,441 | $3M | 0.5% | 2026-Q1 |
| Liontrust Investment Partners LLP | 224,071 | $3M | 0.5% | 2026-Q1 |
| Trexquant Investment LP added | 282,469 | $2M | 0.5% | 2026-Q1 |
| Man Group plc added | 268,814 | $2M | 0.4% | 2026-Q1 |
| MARSHALL WACE, LLP added | 267,147 | $2M | 0.4% | 2026-Q1 |
| BlackRock, Inc. trimmed | 261,805 | $2M | 0.4% | 2026-Q1 |
| Militia Capital Management LLC new | 259,587 | $2M | 0.4% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 210,235 | $2M | 0.4% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 205,620 | $2M | 0.3% | 2026-Q1 |
| MANCHESTER FINANCIAL INC | 200,000 | $2M | 0.3% | 2026-Q1 |
| UBS Group AG trimmed | 171,627 | $2M | 0.3% | 2026-Q1 |
| Uniplan Investment Counsel, Inc. added | 160,451 | $1M | 0.3% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 162,376 | $1M | 0.3% | 2026-Q1 |
| Engineers Gate Manager LP added | 151,571 | $1M | 0.3% | 2026-Q1 |
| TEACHERS RETIREMENT SYSTEM OF THE STATE OF KENTUCKY added | 145,491 | $1M | 0.2% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 144,746 | $1M | 0.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 141,432 | $1M | 0.2% | 2026-Q1 |
| MORGAN STANLEY added | 140,808 | $1M | 0.2% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 104,052 | $916K | 0.2% | 2026-Q1 |
| Burkehill Global Management, LP | 100,000 | $880K | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 98,457 | $866K | 0.2% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 87,771 | $772K | 0.1% | 2026-Q1 |
| Brevan Howard Capital Management LP added | 70,007 | $616K | 0.1% | 2026-Q1 |
| BARCLAYS PLC added | 62,540 | $550K | 0.1% | 2026-Q1 |
| Jump Financial, LLC trimmed | 62,170 | $547K | 0.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 60,665 | $534K | 0.1% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 60,348 | $531K | 0.1% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 55,995 | $490K | 0.1% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL trimmed | 52,270 | $460K | 0.1% | 2026-Q1 |
| X-Square Capital, LLC new | 52,000 | $458K | 0.1% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC added | 51,674 | $455K | 0.1% | 2026-Q1 |
| Dakota Wealth Management | 50,000 | $440K | 0.1% | 2026-Q1 |
| STATE STREET CORP | 48,475 | $427K | 0.1% | 2026-Q1 |
| CITIGROUP INC added | 48,292 | $425K | 0.1% | 2026-Q1 |
| HighTower Advisors, LLC new | 45,800 | $403K | 0.1% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 18,311 | $380K | 0.1% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 42,224 | $372K | 0.1% | 2026-Q1 |
| Magnetar Financial LLC new | 42,210 | $371K | 0.1% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 42,158 | $371K | 0.1% | 2026-Q1 |
| Compound Planning, Inc. | 40,000 | $352K | 0.1% | 2026-Q1 |
| Integrated Wealth Concepts LLC added | 38,947 | $343K | 0.1% | 2026-Q1 |
| PDT Partners, LLC added | 36,848 | $324K | 0.1% | 2026-Q1 |
| MERCATO PARTNERS GROWTH III GP, LLC new | 6,168,022 | $114M | 21.7% | 2025-Q4 stale |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC new | 1,713,427 | $37M | 7.1% | 2025-Q2 stale |
| T. Rowe Price Investment Management, Inc. new | 986,519 | $22M | 4.1% | 2025-Q2 stale |
| Bienville Capital Management, LLC added | 919,052 | $11M | 2.1% | 2025-Q4 stale |
| AMERIPRISE FINANCIAL INC added | 675,936 | $8M | 1.5% | 2025-Q4 stale |
| Driehaus Capital Management LLC new | 333,196 | $7M | 1.4% | 2025-Q2 stale |
| VANGUARD GROUP INC trimmed | 596,874 | $7M | 1.4% | 2025-Q4 stale |
| G2 Investment Partners Management LLC new | 319,883 | $7M | 1.3% | 2025-Q2 stale |
| CAPTRUST FINANCIAL ADVISORS new | 280,597 | $5M | 1.0% | 2025-Q3 stale |
| Pier Capital, LLC new | 226,997 | $4M | 0.8% | 2025-Q3 stale |
| LORD, ABBETT & CO. LLC trimmed | 212,724 | $4M | 0.8% | 2025-Q3 stale |
| BANK OF MONTREAL /CAN/ added | 287,690 | $3M | 0.7% | 2025-Q4 stale |
| SOROS FUND MANAGEMENT LLC added | 128,560 | $2M | 0.5% | 2025-Q3 stale |
| Freestone Grove Partners LP trimmed | 199,621 | $2M | 0.5% | 2025-Q4 stale |
| HBK INVESTMENTS L P new | 100,000 | $2M | 0.4% | 2025-Q2 stale |
| BOOTHBAY FUND MANAGEMENT, LLC new | 99,828 | $2M | 0.4% | 2025-Q2 stale |
| TWO SIGMA INVESTMENTS, LP new | 158,598 | $2M | 0.4% | 2025-Q4 stale |
| S Squared Technology, LLC added | 155,600 | $2M | 0.4% | 2025-Q4 stale |
| LMR Partners LLP new | 75,088 | $2M | 0.3% | 2025-Q2 stale |
| BAMCO INC /NY/ new | 70,000 | $2M | 0.3% | 2025-Q2 stale |
| ZAZOVE ASSOCIATES LLC added | 126,601 | $2M | 0.3% | 2025-Q4 stale |
| Alyeska Investment Group, L.P. trimmed | 73,600 | $1M | 0.3% | 2025-Q3 stale |
| Walleye Capital LLC added | 112,739 | $1M | 0.3% | 2025-Q4 stale |
| Woodline Partners LP new | 60,000 | $1M | 0.2% | 2025-Q2 stale |
| Ghisallo Capital Management LLC | 100,000 | $1M | 0.2% | 2025-Q4 stale |
| Limestone Investment Advisors LP new | 42,000 | $919K | 0.2% | 2025-Q2 stale |
| Fortress Investment Group LLC trimmed | 48,613 | $902K | 0.2% | 2025-Q3 stale |
| WINTON GROUP Ltd new | 73,748 | $881K | 0.2% | 2025-Q4 stale |
| DARK FOREST CAPITAL MANAGEMENT LP added | 71,264 | $851K | 0.2% | 2025-Q4 stale |
| Longaeva Partners L.P. new | 36,056 | $789K | 0.1% | 2025-Q2 stale |
| TWO SIGMA ADVISERS, LP new | 62,502 | $746K | 0.1% | 2025-Q4 stale |
| P.A.W. CAPITAL CORP new | 40,000 | $742K | 0.1% | 2025-Q3 stale |
| TD Asset Management Inc new | 33,406 | $731K | 0.1% | 2025-Q2 stale |
| Concurrent Investment Advisors, LLC added | 36,500 | $677K | 0.1% | 2025-Q3 stale |
| Verition Fund Management LLC new | 51,617 | $616K | 0.1% | 2025-Q4 stale |
| SEVEN GRAND MANAGERS, LLC | 50,000 | $597K | 0.1% | 2025-Q4 stale |
| HARBERT FUND ADVISORS, INC. new | 25,000 | $547K | 0.1% | 2025-Q2 stale |
| JENNISON ASSOCIATES LLC new | 28,885 | $536K | 0.1% | 2025-Q3 stale |
| Swiss National Bank new | 27,300 | $506K | 0.1% | 2025-Q3 stale |
| HRT FINANCIAL LP new | 33,035 | $394K | 0.1% | 2025-Q4 stale |
| SIMPLEX TRADING, LLC new | 17,302 | $378K | 0.1% | 2025-Q2 stale |
| PharVision Advisers, LLC new | 26,288 | $314K | 0.1% | 2025-Q4 stale |
| WOLVERINE TRADING, LLC new | 16,720 | $312K | 0.1% | 2025-Q3 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.