Who owns TNK (TNK)
Which tracked institutional funds hold TNK, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See TNK 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 TNK is one-sided between 2025-Q4 and 2026-Q1: 106 added or opened and 24 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
TNK’s largest tracked holder by dollar value, DIMENSIONAL FUND ADVISORS LP, 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 TNK more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in TNK 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 237 tracked filers holding TNK, 140 increased or opened the position and 104 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 TNK 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 17
- MIZUHO MARKETS AMERICAS LLC$18M
- VANGUARD PORTFOLIO MANAGEMENT LLC$14M
- BALYASNY ASSET MANAGEMENT L.P.$13M
- TWO SIGMA INVESTMENTS, LP$7M
- LAZARD ASSET MANAGEMENT LLC$2M
- Manatuck Hill Partners, LLC$2M
Full exits 15
- Sagil Capital LLP$20M
- VANGUARD GROUP INC$11M
- T. Rowe Price Investment Management, Inc.$5M
- MOORE CAPITAL MANAGEMENT, LP$5M
- Pacer Advisors, Inc.$4M
- Ruffer LLP$4M
Largest adds
- Mercuria Capital Strategies, LLC$65M
- FMR LLC$43M
- DIMENSIONAL FUND ADVISORS LP$42M
- ACADIAN ASSET MANAGEMENT LLC$36M
- BlackRock, Inc.$20M
- AMERICAN CENTURY COMPANIES INC$18M
Largest trims
- FEARNLEY ASSET MANAGEMENT AS$13M
- JANE STREET GROUP, LLC$10M
- BARCLAYS PLC$3M
- CastleKnight Management LP$2M
- MILLENNIUM MANAGEMENT LLC$2M
- Y-Intercept (Hong Kong) Ltd$1M
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 |
|---|---|---|---|---|
| DIMENSIONAL FUND ADVISORS LP added | 1,903,749 | $140M | 9.0% | 2026-Q1 |
| Mercuria Capital Strategies, LLC added | 1,778,956 | $130M | 8.4% | 2026-Q1 |
| FMR LLC added | 1,610,473 | $118M | 7.6% | 2026-Q1 |
| BlackRock, Inc. trimmed | 1,512,317 | $111M | 7.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 989,969 | $73M | 4.7% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 706,797 | $52M | 3.3% | 2026-Q1 |
| MORGAN STANLEY trimmed | 614,297 | $45M | 2.9% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 558,000 | $41M | 2.6% | 2026-Q1 |
| Summit Street Capital Management, LLC | 471,147 | $35M | 2.2% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 421,085 | $31M | 2.0% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 408,962 | $30M | 1.9% | 2026-Q1 |
| STATE STREET CORP added | 401,385 | $29M | 1.9% | 2026-Q1 |
| CastleKnight Management LP trimmed | 390,336 | $29M | 1.8% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 360,461 | $26M | 1.7% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 352,257 | $26M | 1.7% | 2026-Q1 |
| FULLER & THALER ASSET MANAGEMENT, INC. trimmed | 320,495 | $23M | 1.5% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 292,342 | $21M | 1.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 261,260 | $19M | 1.2% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 257,469 | $19M | 1.2% | 2026-Q1 |
| MIZUHO MARKETS AMERICAS LLC new | 250,000 | $18M | 1.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 235,052 | $17M | 1.1% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 219,074 | $16M | 1.0% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 217,493 | $16M | 1.0% | 2026-Q1 |
| NORTHERN TRUST CORP added | 205,725 | $15M | 1.0% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 200,206 | $15M | 0.9% | 2026-Q1 |
| Empowered Funds, LLC added | 191,472 | $14M | 0.9% | 2026-Q1 |
| Oceanic Investment Management LTD added | 190,592 | $14M | 0.9% | 2026-Q1 |
| SYSTEMATIC FINANCIAL MANAGEMENT LP trimmed | 189,533 | $14M | 0.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 188,952 | $14M | 0.9% | 2026-Q1 |
| Hartree Partners, LP added | 185,462 | $14M | 0.9% | 2026-Q1 |
| NEOS Investment Management LLC added | 180,758 | $13M | 0.9% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 174,284 | $13M | 0.8% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 173,670 | $13M | 0.8% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 170,519 | $13M | 0.8% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 166,824 | $12M | 0.8% | 2026-Q1 |
| Man Group plc added | 160,734 | $12M | 0.8% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 152,529 | $11M | 0.7% | 2026-Q1 |
| ROYCE & ASSOCIATES LP trimmed | 145,390 | $11M | 0.7% | 2026-Q1 |
| HRT FINANCIAL LP added | 145,325 | $11M | 0.7% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 124,885 | $9M | 0.6% | 2026-Q1 |
| Trexquant Investment LP added | 109,583 | $8M | 0.5% | 2026-Q1 |
| UBS Group AG trimmed | 107,598 | $8M | 0.5% | 2026-Q1 |
| SEI INVESTMENTS CO added | 106,160 | $8M | 0.5% | 2026-Q1 |
| Quantedge Capital Pte Ltd trimmed | 104,718 | $8M | 0.5% | 2026-Q1 |
| DENALI ADVISORS LLC added | 100,690 | $7M | 0.5% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 95,989 | $7M | 0.5% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 90,519 | $7M | 0.4% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 89,926 | $7M | 0.4% | 2026-Q1 |
| CSM Advisors, LLC added | 84,424 | $6M | 0.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 82,796 | $6M | 0.4% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 82,401 | $6M | 0.4% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 81,828 | $6M | 0.4% | 2026-Q1 |
| Invesco Ltd. added | 71,438 | $5M | 0.3% | 2026-Q1 |
| MARSHALL WACE, LLP added | 71,005 | $5M | 0.3% | 2026-Q1 |
| FEARNLEY ASSET MANAGEMENT AS added | 69,094 | $5M | 0.3% | 2026-Q1 |
| MARTINGALE ASSET MANAGEMENT L P added | 64,367 | $5M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 61,899 | $5M | 0.3% | 2026-Q1 |
| Nuveen, LLC trimmed | 58,381 | $4M | 0.3% | 2026-Q1 |
| GREAT LAKES ADVISORS, LLC added | 58,216 | $4M | 0.3% | 2026-Q1 |
| Hudson Bay Capital Management LP | 56,159 | $4M | 0.3% | 2026-Q1 |
| KLP KAPITALFORVALTNING AS added | 55,000 | $4M | 0.3% | 2026-Q1 |
| Engineers Gate Manager LP added | 54,242 | $4M | 0.3% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 46,934 | $3M | 0.2% | 2026-Q1 |
| IEQ CAPITAL, LLC added | 42,031 | $3M | 0.2% | 2026-Q1 |
| Linden Thomas Advisory Services, LLC added | 38,427 | $3M | 0.2% | 2026-Q1 |
| CREDIT AGRICOLE S A added | 37,826 | $3M | 0.2% | 2026-Q1 |
| Glenorchy Capital Ltd added | 37,501 | $3M | 0.2% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 35,302 | $3M | 0.2% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP added | 34,546 | $3M | 0.2% | 2026-Q1 |
| XTX Topco Ltd added | 34,019 | $2M | 0.2% | 2026-Q1 |
| Strategic Global Advisors, LLC trimmed | 33,526 | $2M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 31,433 | $2M | 0.1% | 2026-Q1 |
| LPL Financial LLC added | 29,187 | $2M | 0.1% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC trimmed | 28,759 | $2M | 0.1% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd trimmed | 26,454 | $2M | 0.1% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO trimmed | 26,200 | $2M | 0.1% | 2026-Q1 |
| Manatuck Hill Partners, LLC added | 24,000 | $2M | 0.1% | 2026-Q1 |
| Marnell Management LLC added | 23,567 | $2M | 0.1% | 2026-Q1 |
| Amundi added | 22,216 | $2M | 0.1% | 2026-Q1 |
| HUSSMAN STRATEGIC ADVISORS, INC. new | 21,000 | $2M | 0.1% | 2026-Q1 |
| Kendall Capital Management trimmed | 19,842 | $1M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 19,755 | $1M | 0.1% | 2026-Q1 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC trimmed | 19,657 | $1M | 0.1% | 2026-Q1 |
| SEGALL BRYANT & HAMILL, LLC trimmed | 20,507 | $1M | 0.1% | 2026-Q1 |
| Sagil Capital LLP trimmed | 373,640 | $20M | 1.3% | 2025-Q4 stale |
| Encompass Capital Advisors LLC added | 449,689 | $17M | 1.1% | 2025-Q1 stale |
| VANGUARD GROUP INC added | 212,892 | $11M | 0.7% | 2025-Q4 stale |
| T. Rowe Price Investment Management, Inc. trimmed | 101,978 | $5M | 0.4% | 2025-Q4 stale |
| MOORE CAPITAL MANAGEMENT, LP trimmed | 90,000 | $5M | 0.3% | 2025-Q4 stale |
| Oxbow Advisors, LLC new | 97,654 | $4M | 0.3% | 2025-Q2 stale |
| Pacer Advisors, Inc. trimmed | 73,163 | $4M | 0.3% | 2025-Q4 stale |
| Ruffer LLP new | 69,863 | $4M | 0.2% | 2025-Q4 stale |
| SummitTX Capital, L.P. added | 73,417 | $4M | 0.2% | 2025-Q3 stale |
| WEXFORD CAPITAL LP trimmed | 52,818 | $3M | 0.2% | 2025-Q4 stale |
| SHARIAPORTFOLIO, INC. trimmed | 48,065 | $3M | 0.2% | 2025-Q4 stale |
| TWINBEECH CAPITAL LP added | 54,615 | $2M | 0.1% | 2025-Q2 stale |
| Foundry Partners, LLC added | 59,451 | $2M | 0.1% | 2025-Q1 stale |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 43,885 | $2M | 0.1% | 2025-Q2 stale |
| Praetorian PR LLC new | 47,514 | $2M | 0.1% | 2025-Q1 stale |
| Numerai GP LLC trimmed | 41,264 | $2M | 0.1% | 2025-Q1 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.