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-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
The tracked-fund tape on NBR is one-sided between 2025-Q4 and 2026-Q1: 96 added or opened and 28 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
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 2025-Q4 and 2026-Q1, across 234 tracked filers holding NBR, 137 increased or opened the position and 89 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 NBR 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 32
- VANGUARD CAPITAL MANAGEMENT LLC$54M
- VANGUARD PORTFOLIO MANAGEMENT LLC$33M
- Allianz Asset Management GmbH$8M
- VANGUARD FIDUCIARY TRUST CO$8M
- Fulcrum Asset Management LLP$4M
- MACKENZIE FINANCIAL CORP$4M
Full exits 14
- VANGUARD GROUP INC$42M
- BRIGADE CAPITAL MANAGEMENT, LP$37M
- HIGHBRIDGE CAPITAL MANAGEMENT LLC$22M
- Varde Management, L.P.$14M
- BARINGS LLC$10M
- VR Advisory Services Ltd$7M
Largest adds
- BlackRock, Inc.$50M
- DIMENSIONAL FUND ADVISORS LP$21M
- TWO SIGMA INVESTMENTS, LP$21M
- AQR CAPITAL MANAGEMENT LLC$21M
- AMERICAN CENTURY COMPANIES INC$21M
- STATE STREET CORP$18M
Largest trims
- MORGAN STANLEY$5M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$5M
- Jump Financial, LLC$3M
- TUDOR INVESTMENT CORP ET AL$2M
- MARSHALL WACE, LLP$2M
- MILLENNIUM MANAGEMENT LLC$2M
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. added | 1,298,692 | $112M | 10.0% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 740,000 | $64M | 5.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 629,289 | $54M | 4.8% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 505,900 | $44M | 3.9% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 471,718 | $41M | 3.6% | 2026-Q1 |
| CIBC WORLD MARKET INC. trimmed | 467,701 | $40M | 3.6% | 2026-Q1 |
| STATE STREET CORP added | 465,000 | $40M | 3.6% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 447,833 | $39M | 3.4% | 2026-Q1 |
| Miller Value Partners, LLC trimmed | 444,430 | $38M | 3.4% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 393,208 | $34M | 3.0% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 383,857 | $33M | 3.0% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 351,865 | $30M | 2.7% | 2026-Q1 |
| GENDELL JEFFREY L | 342,799 | $30M | 2.6% | 2026-Q1 |
| VAN ECK ASSOCIATES CORP added | 310,093 | $27M | 2.4% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 280,313 | $24M | 2.2% | 2026-Q1 |
| MORGAN STANLEY trimmed | 201,956 | $17M | 1.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 151,922 | $13M | 1.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 138,661 | $12M | 1.1% | 2026-Q1 |
| Invesco Ltd. added | 137,265 | $12M | 1.1% | 2026-Q1 |
| NORTHERN TRUST CORP added | 136,552 | $12M | 1.1% | 2026-Q1 |
| Hara Capital LLC trimmed | 112,412 | $10M | 0.9% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 112,146 | $10M | 0.9% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 109,821 | $9M | 0.8% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 97,665 | $8M | 0.8% | 2026-Q1 |
| Allianz Asset Management GmbH added | 95,618 | $8M | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 93,392 | $8M | 0.7% | 2026-Q1 |
| Nuveen, LLC added | 91,459 | $8M | 0.7% | 2026-Q1 |
| BARCLAYS PLC trimmed | 74,040 | $6M | 0.6% | 2026-Q1 |
| Bank of New York Mellon Corp added | 69,053 | $6M | 0.5% | 2026-Q1 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 68,563 | $6M | 0.5% | 2026-Q1 |
| Empowered Funds, LLC added | 65,665 | $6M | 0.5% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 62,775 | $5M | 0.5% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 58,099 | $5M | 0.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 54,278 | $5M | 0.4% | 2026-Q1 |
| Creative Planning added | 50,315 | $4M | 0.4% | 2026-Q1 |
| Fulcrum Asset Management LLP new | 49,420 | $4M | 0.4% | 2026-Q1 |
| HighTower Advisors, LLC trimmed | 46,503 | $4M | 0.4% | 2026-Q1 |
| MACKENZIE FINANCIAL CORP new | 45,704 | $4M | 0.4% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 42,791 | $4M | 0.3% | 2026-Q1 |
| UBS Group AG trimmed | 41,200 | $4M | 0.3% | 2026-Q1 |
| De Lisle Partners LLP added | 40,765 | $4M | 0.3% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 35,847 | $3M | 0.3% | 2026-Q1 |
| FMR LLC added | 35,779 | $3M | 0.3% | 2026-Q1 |
| HRT FINANCIAL LP trimmed | 32,609 | $3M | 0.3% | 2026-Q1 |
| STOREBRAND ASSET MANAGEMENT AS | 31,898 | $3M | 0.2% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC new | 31,793 | $3M | 0.2% | 2026-Q1 |
| Jump Financial, LLC trimmed | 31,521 | $3M | 0.2% | 2026-Q1 |
| Lombard Odier Asset Management (USA) Corp trimmed | 31,000 | $3M | 0.2% | 2026-Q1 |
| WOLVERINE ASSET MANAGEMENT LLC | 30,248 | $3M | 0.2% | 2026-Q1 |
| Knights of Columbus Asset Advisors LLC new | 28,673 | $2M | 0.2% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 26,832 | $2M | 0.2% | 2026-Q1 |
| Numerai GP LLC added | 26,496 | $2M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 26,292 | $2M | 0.2% | 2026-Q1 |
| Engineers Gate Manager LP added | 25,623 | $2M | 0.2% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC | 25,510 | $2M | 0.2% | 2026-Q1 |
| Kestra Advisory Services, LLC added | 24,937 | $2M | 0.2% | 2026-Q1 |
| Man Group plc added | 23,570 | $2M | 0.2% | 2026-Q1 |
| NICOLA WEALTH MANAGEMENT LTD. | 23,200 | $2M | 0.2% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 22,781 | $2M | 0.2% | 2026-Q1 |
| OneDigital Investment Advisors LLC added | 22,441 | $2M | 0.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 20,739 | $2M | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 20,646 | $2M | 0.2% | 2026-Q1 |
| Swiss National Bank trimmed | 20,200 | $2M | 0.2% | 2026-Q1 |
| Parallax Volatility Advisers, L.P. | 20,000 | $2M | 0.1% | 2026-Q1 |
| Trexquant Investment LP trimmed | 19,228 | $2M | 0.1% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP trimmed | 18,338 | $2M | 0.1% | 2026-Q1 |
| Invst, LLC trimmed | 18,334 | $2M | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 17,843 | $2M | 0.1% | 2026-Q1 |
| JENNISON ASSOCIATES LLC trimmed | 16,823 | $1M | 0.1% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 16,800 | $1M | 0.1% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 15,999 | $1M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 15,811 | $1M | 0.1% | 2026-Q1 |
| WINTON GROUP Ltd added | 15,503 | $1M | 0.1% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 15,393 | $1M | 0.1% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 15,336 | $1M | 0.1% | 2026-Q1 |
| RBF Capital, LLC trimmed | 15,200 | $1M | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 13,819 | $1M | 0.1% | 2026-Q1 |
| Mariner, LLC new | 13,467 | $1M | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 13,113 | $1M | 0.1% | 2026-Q1 |
| CoreCommodity Management, LLC trimmed | 13,016 | $1M | 0.1% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC added | 12,716 | $1M | 0.1% | 2026-Q1 |
| Brevan Howard Capital Management LP new | 12,285 | $1M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 767,125 | $42M | 3.7% | 2025-Q4 stale |
| BRIGADE CAPITAL MANAGEMENT, LP trimmed | 675,879 | $37M | 3.3% | 2025-Q4 stale |
| OAKTREE CAPITAL MANAGEMENT LP added | 737,112 | $30M | 2.7% | 2025-Q3 stale |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC trimmed | 413,294 | $22M | 2.0% | 2025-Q4 stale |
| Varde Management, L.P. trimmed | 264,220 | $14M | 1.3% | 2025-Q4 stale |
| BARINGS LLC trimmed | 179,841 | $10M | 0.9% | 2025-Q4 stale |
| Apollo Management Holdings, L.P. trimmed | 191,060 | $8M | 0.7% | 2025-Q3 stale |
| VR Advisory Services Ltd | 134,789 | $7M | 0.7% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 108,800 | $6M | 0.5% | 2025-Q4 stale |
| SUSQUEHANNA ADVISORS GROUP, INC. added | 102,136 | $4M | 0.4% | 2025-Q3 stale |
| Diameter Capital Partners LP trimmed | 100,000 | $4M | 0.4% | 2025-Q3 stale |
| JANE STREET GROUP, LLC added | 61,622 | $3M | 0.3% | 2025-Q4 stale |
| WOLVERINE TRADING, LLC added | 72,762 | $3M | 0.3% | 2025-Q1 stale |
| BROOKFIELD Corp /ON/ | 38,719 | $2M | 0.2% | 2025-Q4 stale |
| Sagefield Capital LP new | 41,457 | $2M | 0.2% | 2025-Q1 stale |
| Tejara Capital Ltd trimmed | 26,941 | $1M | 0.1% | 2025-Q4 stale |
| Point72 Asset Management, L.P. trimmed | 25,021 | $1M | 0.1% | 2025-Q4 stale |
| Balyasny Asset Management L.P. added | 19,143 | $1M | 0.1% | 2025-Q4 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.