Who owns Starz Entertainment (STRZ)
Which tracked institutional funds hold STRZ, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See STRZ 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
The tracked-fund tape on STRZ is one-sided between 2026-Q1 and 2026-Q2: 57 added or opened and 8 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
STRZ’s largest tracked holder by dollar value, MHR FUND MANAGEMENT LLC, sizes it at 4.3% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 4.3pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in STRZ 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 141 tracked filers holding STRZ, 67 increased or opened the position and 66 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 STRZ 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
- Concentric Capital Strategies, LP$2M
- Potrero Capital Research LLC$2M
- TWO SIGMA INVESTMENTS, LP$1M
- JACOBS LEVY EQUITY MANAGEMENT, INC$1M
- MARTINGALE ASSET MANAGEMENT L P$627K
Full exits 6
- BANK OF MONTREAL /CAN/$21M
- ACADIAN ASSET MANAGEMENT LLC$3M
- J. Goldman & Co LP$3M
- PEAK6 LLC$1M
- Alpine Global Management, LLC$990K
- RENAISSANCE TECHNOLOGIES LLC$577K
Largest adds
- MHR FUND MANAGEMENT LLC$50M
- CastleKnight Management LP$27M
- BlackRock, Inc.$22M
- ROYCE & ASSOCIATES LP$10M
- VANGUARD CAPITAL MANAGEMENT LLC$10M
- Russell Investments Group, Ltd.$7M
Largest trims
- MILLENNIUM MANAGEMENT LLC$809K
- Verition Fund Management LLC$366K
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| MHR FUND MANAGEMENT LLC | 2,863,232 | $83M | 22.1% | 2026-Q2 |
| CastleKnight Management LP added | 1,242,780 | $36M | 9.6% | 2026-Q2 |
| BlackRock, Inc. added | 1,233,509 | $36M | 9.5% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 559,721 | $16M | 4.3% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 552,811 | $16M | 4.3% | 2026-Q2 |
| NewEdge Wealth, LLC trimmed | 482,028 | $14M | 3.7% | 2026-Q2 |
| SHAPIRO CAPITAL MANAGEMENT LLC trimmed | 472,202 | $14M | 3.6% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 415,112 | $12M | 3.2% | 2026-Q2 |
| Ancora Advisors LLC trimmed | 409,763 | $12M | 3.2% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 390,182 | $11M | 3.0% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 331,060 | $10M | 2.6% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 312,485 | $9M | 2.4% | 2026-Q2 |
| Jefferies Financial Group Inc. | 278,133 | $8M | 2.1% | 2026-Q2 |
| STATE STREET CORP trimmed | 270,583 | $8M | 2.1% | 2026-Q2 |
| Nuveen, LLC added | 233,783 | $7M | 1.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 166,255 | $5M | 1.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 164,155 | $5M | 1.3% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 158,083 | $5M | 1.2% | 2026-Q2 |
| Coastal Bridge Advisors, LLC | 140,528 | $4M | 1.1% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 127,160 | $4M | 1.0% | 2026-Q2 |
| Diametric Capital, LP trimmed | 117,467 | $3M | 0.9% | 2026-Q2 |
| NORTHERN TRUST CORP added | 98,667 | $3M | 0.8% | 2026-Q2 |
| Huber Capital Management LLC trimmed | 97,447 | $3M | 0.8% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 95,558 | $3M | 0.7% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 90,062 | $3M | 0.7% | 2026-Q2 |
| GABELLI FUNDS LLC | 85,500 | $2M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 85,034 | $2M | 0.7% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 82,904 | $2M | 0.6% | 2026-Q2 |
| Concentric Capital Strategies, LP new | 82,828 | $2M | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 61,468 | $2M | 0.5% | 2026-Q2 |
| Potrero Capital Research LLC trimmed | 56,195 | $2M | 0.4% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 50,875 | $1M | 0.4% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP new | 50,592 | $1M | 0.4% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 48,885 | $1M | 0.4% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 48,301 | $1M | 0.4% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC new | 47,545 | $1M | 0.4% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 46,784 | $1M | 0.4% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 42,960 | $1M | 0.3% | 2026-Q2 |
| GAMCO INVESTORS, INC. ET AL trimmed | 42,411 | $1M | 0.3% | 2026-Q2 |
| MORGAN STANLEY trimmed | 39,184 | $1M | 0.3% | 2026-Q2 |
| Trexquant Investment LP added | 37,474 | $1M | 0.3% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 35,443 | $1M | 0.3% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 35,152 | $1M | 0.3% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 32,716 | $941K | 0.3% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 31,225 | $901K | 0.2% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 30,851 | $887K | 0.2% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 27,275 | $787K | 0.2% | 2026-Q2 |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 27,265 | $787K | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 25,887 | $747K | 0.2% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC added | 25,635 | $740K | 0.2% | 2026-Q2 |
| STRS OHIO trimmed | 23,800 | $687K | 0.2% | 2026-Q2 |
| UBS Group AG added | 22,890 | $661K | 0.2% | 2026-Q2 |
| MYDA Advisors LLC added | 22,000 | $635K | 0.2% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P new | 21,732 | $627K | 0.2% | 2026-Q2 |
| Boston Partners added | 20,032 | $578K | 0.2% | 2026-Q2 |
| WOLVERINE ASSET MANAGEMENT LLC added | 19,943 | $576K | 0.2% | 2026-Q2 |
| Verition Fund Management LLC trimmed | 18,647 | $538K | 0.1% | 2026-Q2 |
| Mariner, LLC trimmed | 17,748 | $512K | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 16,388 | $473K | 0.1% | 2026-Q2 |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 15,794 | $456K | 0.1% | 2026-Q2 |
| Pathstone Holdings, LLC added | 15,691 | $453K | 0.1% | 2026-Q2 |
| OPPENHEIMER ASSET MANAGEMENT INC. trimmed | 15,052 | $434K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 14,967 | $172K | 0.0% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 14,622 | $422K | 0.1% | 2026-Q2 |
| Invesco Ltd. trimmed | 14,481 | $418K | 0.1% | 2026-Q2 |
| Creative Planning new | 14,113 | $407K | 0.1% | 2026-Q2 |
| Ratan Capital Management LP new | 12,738 | $368K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 11,836 | $342K | 0.1% | 2026-Q2 |
| XTX Topco Ltd trimmed | 11,122 | $321K | 0.1% | 2026-Q2 |
| KORNITZER CAPITAL MANAGEMENT INC /KS trimmed | 11,082 | $320K | 0.1% | 2026-Q2 |
| Quinn Opportunity Partners LLC new | 10,893 | $314K | 0.1% | 2026-Q2 |
| Sequoia Financial Advisors, LLC | 10,688 | $308K | 0.1% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP new | 10,154 | $293K | 0.1% | 2026-Q2 |
| Westmount Partners, LLC | 10,000 | $289K | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC new | 9,958 | $287K | 0.1% | 2026-Q2 |
| Qube Research & Technologies Ltd new | 9,883 | $285K | 0.1% | 2026-Q2 |
| Quadrature Capital Ltd new | 9,851 | $284K | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC new | 9,301 | $268K | 0.1% | 2026-Q2 |
| Magnetar Financial LLC new | 8,347 | $241K | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC new | 7,867 | $227K | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 7,025 | $206K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC | 6,918 | $200K | 0.1% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 6,887 | $199K | 0.1% | 2026-Q2 |
| Persistent Asset Partners Ltd new | 6,805 | $196K | 0.1% | 2026-Q2 |
| FMR LLC added | 6,134 | $177K | 0.0% | 2026-Q2 |
| CITIGROUP INC added | 5,597 | $162K | 0.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 5,559 | $160K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 5,446 | $157K | 0.0% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 4,785 | $138K | 0.0% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey | 3,059 | $88K | 0.0% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 1,715 | $49K | 0.0% | 2026-Q2 |
| Arax Advisory Partners added | 1,554 | $45K | 0.0% | 2026-Q2 |
| Ameritas Investment Partners, Inc. trimmed | 1,232 | $36K | 0.0% | 2026-Q2 |
| Legal & General Group Plc | 1,165 | $34K | 0.0% | 2026-Q2 |
| Bleichroeder LP | 1,092 | $32K | 0.0% | 2026-Q2 |
| Tower Research Capital LLC (TRC) trimmed | 965 | $28K | 0.0% | 2026-Q2 |
| Global Retirement Partners, LLC trimmed | 791 | $23K | 0.0% | 2026-Q2 |
| GROUP ONE TRADING LLC trimmed | 599 | $17K | 0.0% | 2026-Q2 |
| SIMPLEX TRADING, LLC trimmed | 563 | $16K | 0.0% | 2026-Q2 |
| GAMMA Investing LLC added | 484 | $14K | 0.0% | 2026-Q2 |
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.