Who owns NBR
Which tracked institutional funds hold NBR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See NBR 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
54 tracked funds added or opened NBR while 47 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
NBR’s largest tracked holder by dollar value, BlackRock, 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 NBR more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in NBR 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 240 tracked filers holding NBR, 147 increased or opened the position and 100 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 NBR 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 16
- Encompass Capital Advisors LLC$26M
- HENNESSY ADVISORS INC$8M
- Arlington Capital Management, Inc.$3M
- MEEDER ASSET MANAGEMENT INC$3M
- EFG International AG$2M
- Concurrent Investment Advisors, LLC$2M
Full exits 14
- MARSHALL WACE, LLP$5M
- Fulcrum Asset Management LLP$4M
- HighTower Advisors, LLC$4M
- HRT FINANCIAL LP$3M
- Jump Financial, LLC$3M
- Numerai GP LLC$2M
Largest adds
- Engineers Gate Manager LP$33M
- MACKENZIE FINANCIAL CORP$11M
- DIMENSIONAL FUND ADVISORS LP$11M
- GOLDMAN SACHS GROUP INC$10M
- AMERICAN CENTURY COMPANIES INC$10M
- JPMORGAN CHASE & CO$7M
Largest trims
- ADAGE CAPITAL PARTNERS GP, L.L.C.$28M
- CIBC WORLD MARKET INC.$18M
- CHARLES SCHWAB INVESTMENT MANAGEMENT INC$9M
- BANK OF AMERICA CORP /DE/$8M
- CITADEL ADVISORS LLC$8M
- TWO SIGMA INVESTMENTS, LP$6M
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 |
|---|---|---|---|---|
| BlackRock, Inc. added | 1,310,684 | $110M | 11.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 664,925 | $56M | 5.7% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 640,469 | $54M | 5.5% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 586,517 | $49M | 5.0% | 2026-Q2 |
| STATE STREET CORP added | 484,651 | $41M | 4.1% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 460,439 | $39M | 3.9% | 2026-Q2 |
| Miller Value Partners, LLC added | 445,460 | $37M | 3.8% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 420,000 | $35M | 3.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 418,217 | $35M | 3.6% | 2026-Q2 |
| Engineers Gate Manager LP added | 414,599 | $35M | 3.5% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 377,721 | $32M | 3.2% | 2026-Q2 |
| GENDELL JEFFREY L added | 348,234 | $29M | 3.0% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 331,585 | $28M | 2.8% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP added | 328,541 | $28M | 2.8% | 2026-Q2 |
| Encompass Capital Advisors LLC new | 315,000 | $26M | 2.7% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 303,531 | $25M | 2.6% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 265,756 | $22M | 2.3% | 2026-Q2 |
| CIBC WORLD MARKET INC. trimmed | 264,722 | $22M | 2.3% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP added | 175,138 | $15M | 1.5% | 2026-Q2 |
| MORGAN STANLEY trimmed | 168,392 | $14M | 1.4% | 2026-Q2 |
| Allianz Asset Management GmbH added | 148,935 | $13M | 1.3% | 2026-Q2 |
| NORTHERN TRUST CORP added | 145,741 | $12M | 1.2% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 133,745 | $11M | 1.1% | 2026-Q2 |
| Hara Capital LLC trimmed | 106,029 | $9M | 0.9% | 2026-Q2 |
| Invesco Ltd. trimmed | 98,635 | $8M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 98,271 | $8M | 0.8% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 97,635 | $8M | 0.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 97,002 | $8M | 0.8% | 2026-Q2 |
| UBS Group AG added | 93,225 | $8M | 0.8% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 90,695 | $8M | 0.8% | 2026-Q2 |
| HENNESSY ADVISORS INC new | 90,600 | $8M | 0.8% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 80,261 | $7M | 0.7% | 2026-Q2 |
| Bank of New York Mellon Corp added | 72,222 | $6M | 0.6% | 2026-Q2 |
| Empowered Funds, LLC added | 69,745 | $6M | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 60,662 | $5M | 0.5% | 2026-Q2 |
| Creative Planning added | 59,036 | $5M | 0.5% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 57,597 | $5M | 0.5% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 54,444 | $5M | 0.5% | 2026-Q2 |
| FMR LLC added | 52,872 | $4M | 0.5% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 50,357 | $4M | 0.4% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 46,725 | $4M | 0.4% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 43,353 | $4M | 0.4% | 2026-Q2 |
| De Lisle Partners LLP | 40,765 | $3M | 0.3% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 38,023 | $3M | 0.3% | 2026-Q2 |
| Arlington Capital Management, Inc. new | 37,429 | $3M | 0.3% | 2026-Q2 |
| BARCLAYS PLC trimmed | 36,781 | $3M | 0.3% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 36,485 | $3M | 0.3% | 2026-Q2 |
| MEEDER ASSET MANAGEMENT INC new | 34,994 | $3M | 0.3% | 2026-Q2 |
| Nuveen, LLC trimmed | 32,042 | $3M | 0.3% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 30,569 | $3M | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 30,291 | $3M | 0.3% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 29,947 | $3M | 0.3% | 2026-Q2 |
| EFG International AG new | 29,350 | $2M | 0.3% | 2026-Q2 |
| Knights of Columbus Asset Advisors LLC trimmed | 28,541 | $2M | 0.2% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 27,957 | $2M | 0.2% | 2026-Q2 |
| WOLVERINE ASSET MANAGEMENT LLC trimmed | 27,748 | $2M | 0.2% | 2026-Q2 |
| STOREBRAND ASSET MANAGEMENT AS trimmed | 26,898 | $2M | 0.2% | 2026-Q2 |
| Concurrent Investment Advisors, LLC new | 24,766 | $2M | 0.2% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P added | 24,628 | $2M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 24,461 | $2M | 0.2% | 2026-Q2 |
| Kestra Advisory Services, LLC trimmed | 24,357 | $2M | 0.2% | 2026-Q2 |
| Integrated Quantitative Investments LLC added | 24,002 | $2M | 0.2% | 2026-Q2 |
| NICOLA WEALTH MANAGEMENT LTD. | 23,200 | $2M | 0.2% | 2026-Q2 |
| Man Group plc trimmed | 22,687 | $2M | 0.2% | 2026-Q2 |
| OneDigital Investment Advisors LLC added | 22,442 | $2M | 0.2% | 2026-Q2 |
| Lombard Odier Asset Management (USA) Corp trimmed | 21,500 | $2M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 20,600 | $2M | 0.2% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 18,088 | $2M | 0.2% | 2026-Q2 |
| Gotham Asset Management, LLC added | 17,914 | $2M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 17,358 | $1M | 0.1% | 2026-Q2 |
| Qube Research & Technologies Ltd new | 17,289 | $1M | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 16,145 | $1M | 0.1% | 2026-Q2 |
| CREDIT AGRICOLE S A new | 16,000 | $1M | 0.1% | 2026-Q2 |
| VIRGINIA RETIREMENT SYSTEMS ET Al added | 14,300 | $1M | 0.1% | 2026-Q2 |
| JENNISON ASSOCIATES LLC trimmed | 14,148 | $1M | 0.1% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC trimmed | 13,743 | $1M | 0.1% | 2026-Q2 |
| CoreCommodity Management, LLC added | 13,244 | $1M | 0.1% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 13,147 | $1M | 0.1% | 2026-Q2 |
| Mariner, LLC trimmed | 12,785 | $1M | 0.1% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 12,602 | $1M | 0.1% | 2026-Q2 |
| Invst, LLC trimmed | 12,565 | $1M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 12,342 | $1M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 12,170 | $1M | 0.1% | 2026-Q2 |
| Federation des caisses Desjardins du Quebec added | 11,458 | $963K | 0.1% | 2026-Q2 |
| Diametric Capital, LP added | 11,447 | $962K | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 11,378 | $956K | 0.1% | 2026-Q2 |
| Timothy G. Youngquist 2020 Irrevocable Trust added | 11,276 | $947K | 0.1% | 2026-Q2 |
| MANGROVE PARTNERS IM, LLC added | 10,924 | $918K | 0.1% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ new | 10,715 | $900K | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 10,695 | $898K | 0.1% | 2026-Q2 |
| XTX Topco Ltd trimmed | 10,511 | $883K | 0.1% | 2026-Q2 |
| HUSSMAN STRATEGIC ADVISORS, INC. new | 10,500 | $882K | 0.1% | 2026-Q2 |
| DARK FOREST CAPITAL MANAGEMENT LP trimmed | 10,338 | $868K | 0.1% | 2026-Q2 |
| WINTON GROUP Ltd trimmed | 10,283 | $864K | 0.1% | 2026-Q2 |
| Parallax Volatility Advisers, L.P. trimmed | 10,000 | $840K | 0.1% | 2026-Q2 |
| Mirae Asset Global Investments Co., Ltd. | 9,653 | $811K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 9,461 | $795K | 0.1% | 2026-Q2 |
| Legato Capital Management LLC added | 9,359 | $786K | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC added | 9,342 | $785K | 0.1% | 2026-Q2 |
| Williams Jones Wealth Management, LLC. trimmed | 9,000 | $756K | 0.1% | 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.