Who owns OSG (OSG)
Which tracked institutional funds hold OSG, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See OSG 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 OSG is one-sided between 2025-Q4 and 2026-Q1: 12 added or opened and 50 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
OSG’s largest tracked holder by dollar value, VANGUARD GROUP INC, 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 gap the other way — the median holder sizes OSG more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in OSG 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 149 tracked filers holding OSG, 71 increased or opened the position and 91 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 OSG 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 7
- VANGUARD CAPITAL MANAGEMENT LLC$9M
- RIHO Partners, LLC$3M
- IPG Investment Advisors LLC$2M
- Brooklyn Investment Group$2M
- VANGUARD PORTFOLIO MANAGEMENT LLC$1M
- VANGUARD FIDUCIARY TRUST CO$1M
Full exits 7
- VANGUARD GROUP INC$20M
- VELA Investment Management, LLC$1M
- Schonfeld Strategic Advisors LLC$1M
- ExodusPoint Capital Management, LP$854K
- Creative Planning$533K
- Diametric Capital, LP$517K
Largest adds
- JACOBS LEVY EQUITY MANAGEMENT, INC$2M
- NORGES BANK$2M
- RENAISSANCE TECHNOLOGIES LLC$863K
- Prescott Group Capital Management, L.L.C.$454K
- XTX Topco Ltd$302K
Largest trims
- BlackRock, Inc.$17M
- Western Standard LLC$9M
- JANE STREET GROUP, LLC$8M
- Wolf Hill Capital Management, LP$8M
- DIMENSIONAL FUND ADVISORS LP$7M
- MORGAN STANLEY$6M
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 |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 3,917,798 | $18M | 8.2% | 2026-Q1 |
| Western Standard LLC trimmed | 2,247,591 | $10M | 4.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,945,076 | $9M | 4.1% | 2026-Q1 |
| Prescott Group Capital Management, L.L.C. added | 1,592,587 | $7M | 3.4% | 2026-Q1 |
| Wolf Hill Capital Management, LP trimmed | 1,470,334 | $7M | 3.1% | 2026-Q1 |
| GENDELL JEFFREY L trimmed | 1,413,212 | $7M | 3.0% | 2026-Q1 |
| THIRD AVENUE MANAGEMENT LLC added | 1,341,211 | $6M | 2.8% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,310,132 | $6M | 2.8% | 2026-Q1 |
| Bain Capital Credit, LP | 1,108,012 | $5M | 2.3% | 2026-Q1 |
| MARSHALL WACE, LLP added | 1,065,335 | $5M | 2.2% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 1,022,438 | $5M | 2.2% | 2026-Q1 |
| STATE STREET CORP trimmed | 941,404 | $4M | 2.0% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 884,272 | $4M | 1.9% | 2026-Q1 |
| Nuveen, LLC trimmed | 800,253 | $4M | 1.7% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 764,384 | $4M | 1.6% | 2026-Q1 |
| Caption Management, LLC trimmed | 642,597 | $3M | 1.4% | 2026-Q1 |
| Bracebridge Capital, LLC | 579,234 | $3M | 1.2% | 2026-Q1 |
| RIHO Partners, LLC new | 546,569 | $3M | 1.2% | 2026-Q1 |
| NORGES BANK added | 263,100 | $2M | 1.0% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 431,809 | $2M | 0.9% | 2026-Q1 |
| ESSEX INVESTMENT MANAGEMENT CO LLC added | 418,203 | $2M | 0.9% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 390,193 | $2M | 0.8% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 346,293 | $2M | 0.7% | 2026-Q1 |
| IPG Investment Advisors LLC new | 325,616 | $2M | 0.7% | 2026-Q1 |
| Brooklyn Investment Group added | 325,351 | $2M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 322,348 | $1M | 0.7% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 295,900 | $1M | 0.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 295,344 | $1M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 274,562 | $1M | 0.6% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 268,434 | $1M | 0.6% | 2026-Q1 |
| UBS Group AG added | 264,280 | $1M | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 256,110 | $1M | 0.5% | 2026-Q1 |
| MORGAN STANLEY trimmed | 235,246 | $1M | 0.5% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 227,726 | $1M | 0.5% | 2026-Q1 |
| Harbor Advisors LLC | 196,382 | $913K | 0.4% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 182,504 | $849K | 0.4% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 181,271 | $843K | 0.4% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 159,963 | $744K | 0.3% | 2026-Q1 |
| SEI INVESTMENTS CO added | 156,078 | $726K | 0.3% | 2026-Q1 |
| Invesco Ltd. trimmed | 151,042 | $702K | 0.3% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 144,301 | $671K | 0.3% | 2026-Q1 |
| Arrowpoint Investment Partners (Singapore) Pte. Ltd. trimmed | 139,168 | $647K | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 135,088 | $628K | 0.3% | 2026-Q1 |
| Legato Capital Management LLC trimmed | 130,760 | $608K | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 130,471 | $607K | 0.3% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 120,540 | $561K | 0.3% | 2026-Q1 |
| XTX Topco Ltd added | 116,911 | $544K | 0.2% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 115,045 | $535K | 0.2% | 2026-Q1 |
| Empowered Funds, LLC trimmed | 114,004 | $530K | 0.2% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 113,656 | $528K | 0.2% | 2026-Q1 |
| Cruiser Capital Advisors, LLC added | 108,798 | $506K | 0.2% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 102,430 | $476K | 0.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 101,965 | $475K | 0.2% | 2026-Q1 |
| Engineers Gate Manager LP added | 100,416 | $467K | 0.2% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 76,907 | $358K | 0.2% | 2026-Q1 |
| Jump Financial, LLC trimmed | 70,598 | $328K | 0.1% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 70,110 | $326K | 0.1% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO added | 68,805 | $320K | 0.1% | 2026-Q1 |
| Walleye Capital LLC trimmed | 67,134 | $312K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 37,530 | $292K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 2,508,395 | $20M | 8.8% | 2025-Q4 stale |
| CONTINENTAL GENERAL INSURANCE CO added | 2,068,349 | $17M | 7.8% | 2025-Q3 stale |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC added | 793,500 | $6M | 2.6% | 2025-Q2 stale |
| Repertoire Partners LP trimmed | 721,188 | $5M | 2.3% | 2025-Q2 stale |
| IMMERSION CORP new | 300,000 | $2M | 1.0% | 2025-Q2 stale |
| Cubist Systematic Strategies, LLC added | 299,948 | $2M | 1.0% | 2025-Q2 stale |
| VELA Investment Management, LLC trimmed | 178,752 | $1M | 0.6% | 2025-Q4 stale |
| Schonfeld Strategic Advisors LLC trimmed | 169,824 | $1M | 0.6% | 2025-Q4 stale |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 145,901 | $1M | 0.6% | 2025-Q1 stale |
| Trexquant Investment LP trimmed | 136,696 | $1M | 0.5% | 2025-Q3 stale |
| Walleye Trading LLC trimmed | 154,159 | $1M | 0.5% | 2025-Q2 stale |
| OCCUDO QUANTITATIVE STRATEGIES LP added | 114,575 | $991K | 0.4% | 2025-Q1 stale |
| ExodusPoint Capital Management, LP added | 109,765 | $854K | 0.4% | 2025-Q4 stale |
| Swiss National Bank trimmed | 91,900 | $804K | 0.4% | 2025-Q1 stale |
| UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 89,256 | $781K | 0.4% | 2025-Q1 stale |
| Nebula Research & Development LLC added | 107,124 | $761K | 0.3% | 2025-Q2 stale |
| DARK FOREST CAPITAL MANAGEMENT LP added | 77,234 | $676K | 0.3% | 2025-Q1 stale |
| Empirical Finance, LLC | 72,182 | $602K | 0.3% | 2025-Q3 stale |
| Sender Co & Partners, Inc. new | 70,890 | $591K | 0.3% | 2025-Q3 stale |
| ROYCE & ASSOCIATES LP trimmed | 66,122 | $579K | 0.3% | 2025-Q1 stale |
| Dynamic Technology Lab Private Ltd added | 64,233 | $562K | 0.3% | 2025-Q1 stale |
| ALGERT GLOBAL LLC trimmed | 62,719 | $549K | 0.2% | 2025-Q1 stale |
| Creative Planning trimmed | 68,537 | $533K | 0.2% | 2025-Q4 stale |
| Diametric Capital, LP added | 66,478 | $517K | 0.2% | 2025-Q4 stale |
| PUBLIC SECTOR PENSION INVESTMENT BOARD | 72,000 | $511K | 0.2% | 2025-Q2 stale |
| CAXTON ASSOCIATES LLP | 65,647 | $511K | 0.2% | 2025-Q4 stale |
| DLD Asset Management, LP trimmed | 60,421 | $470K | 0.2% | 2025-Q4 stale |
| Aurelius Capital Management, LP new | 60,546 | $430K | 0.2% | 2025-Q2 stale |
| Calamos Advisors LLC new | 49,089 | $382K | 0.2% | 2025-Q4 stale |
| HAP Trading, LLC added | 41,939 | $367K | 0.2% | 2025-Q1 stale |
| TWO SIGMA INVESTMENTS, LP added | 45,044 | $350K | 0.2% | 2025-Q4 stale |
| Y-Intercept (Hong Kong) Ltd trimmed | 43,781 | $341K | 0.2% | 2025-Q4 stale |
| Balyasny Asset Management L.P. trimmed | 42,917 | $334K | 0.2% | 2025-Q4 stale |
| FOX RUN MANAGEMENT, L.L.C. added | 42,354 | $330K | 0.1% | 2025-Q4 stale |
| Jain Global LLC new | 36,672 | $321K | 0.1% | 2025-Q1 stale |
| FIRST CITIZENS BANK & TRUST CO added | 43,210 | $307K | 0.1% | 2025-Q2 stale |
| CANADA LIFE ASSURANCE Co trimmed | 34,226 | $300K | 0.1% | 2025-Q1 stale |
| Envestnet Portfolio Solutions, Inc. added | 41,667 | $296K | 0.1% | 2025-Q2 stale |
| TWO SIGMA ADVISERS, LP added | 32,300 | $283K | 0.1% | 2025-Q1 stale |
| Qube Research & Technologies Ltd trimmed | 37,584 | $267K | 0.1% | 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.