231 tracked 13F filers disclose a position in NBR as of the latest SEC 13F filings, a combined $946.5M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
| # | Fund | Position value | Shares | Last move | As of | History |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | $111.8M | 1.3M | ▲+14% Added · +157K sh | Q1 2026 | |
| 2 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $63.7M | 740K | ▼−41% Reduced · −520K sh | Q1 2026 | |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $54.2M | 629K | →First observed position No prior filed position | Q1 2026 | |
| 4 | AMERICAN CENTURY COMPANIES INC | $43.5M | 506K | ▲+20% Added · +84K sh | Q1 2026 | |
| 5 | STATE STREET CORP | $40.7M | 485K | ▲+4.2% Added · +20K sh | Q2 2026 | |
| 6 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $40.6M | 472K | ▼−2.8% Reduced · −14K sh | Q1 2026 | |
| 7 | CIBC WORLD MARKET INC. | $40.3M | 468K | ▼−6.3% Reduced · −31K sh | Q1 2026 | |
| 8 | DIMENSIONAL FUND ADVISORS LP | $38.5M | 448K | ▲+42% Added · +133K sh | Q1 2026 | |
| 9 | MILLER VALUE PARTNERS, LLC | $38.2M | 444K | ▼−26% Reduced · −158K sh | Q1 2026 | |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $35.1M | 418K | ▲+19% Added · +66K sh | Q2 2026 | |
| 11 | Engineers Gate Manager LP | $34.8M | 415K | ▲16× Added · +389K sh | Q2 2026 | |
| 12 | TWO SIGMA INVESTMENTS, LP | $33.8M | 393K | ▲+70% Added · +163K sh | Q1 2026 | |
| 13 | VANGUARD PORTFOLIO MANAGEMENT LLC | $33.0M | 384K | →First observed position No prior filed position | Q1 2026 | |
| 14 | GENDELL JEFFREY L | $29.5M | 343K | —Held | Q1 2026 | |
| 15 | VAN ECK ASSOCIATES CORP | Withheld | 310K | ▲+11% Added · +31K sh | Q1 2026 | |
| 16 | AQR CAPITAL MANAGEMENT LLC | $24.3M | 283K | ▲+436% Added · +230K sh | Q1 2026 | |
| 17 | MORGAN STANLEY | $17.4M | 202K | ▼−51% Reduced · −210K sh | Q1 2026 | |
| 18 | BANK OF AMERICA CORP /DE/ | $13.1M | 152K | ▲+192% Added · +100K sh | Q1 2026 | |
| 19 | GOLDMAN SACHS GROUP INC | $11.9M | 139K | ▲+15% Added · +18K sh | Q1 2026 | |
| 20 | NORTHERN TRUST CORP | $11.8M | 137K | ▲+16% Added · +19K sh | Q1 2026 | |
| 21 | D. E. Shaw & Co., Inc. | $9.7M | 112K | ▲+218% Added · +77K sh | Q1 2026 | |
| 22 | CITADEL ADVISORS LLC | $9.5M | 110K | ▲+100% Added · +55K sh | Q1 2026 | |
| 23 | Hara Capital LLC | $8.9M | 106K | ▼−5.7% Reduced · −6K sh | Q2 2026 | |
| 24 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | $8.4M | 98K | ▲+25% Added · +19K sh | Q1 2026 | |
| 25 | Allianz Asset Management GmbH | $8.2M | 96K | ▲New +96K sh | Q1 2026 |
Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.
Last quarter, 13 funds opened a new position in NBR and 27 added to an existing one, while 16 reduced and 0 exited entirely — based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).
| Company | Co-held by | Combined value |
|---|---|---|
| AMAZON.COM INCAMZN | 122 funds | $160.9B |
| NVIDIA CORPNVDA | 121 funds | $320.3B |
| MICROSOFT CORPMSFT | 121 funds | $215.6B |
| MICRON TECHNOLOGY INCMU | 119 funds | $31.8B |
| APPLE INCAAPL | 117 funds | $241.3B |
| ALPHABET INC-CL AGOOGL | 117 funds | $127.5B |
| META PLATFORMS INC-CLASS AMETA | 117 funds | $89.5B |
| BROADCOM INCAVGO | 114 funds | $132.5B |
| ELI LILLY & COLLY | 114 funds | $64.9B |
| VISA INC-CLASS A SHARESV | 114 funds | $45.6B |
| JPMORGAN CHASE & COJPM | 114 funds | $45.4B |
| COSTCO WHOLESALE CORPCOST | 114 funds | $31.9B |
Ranked by how many of NBR's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 28, 2026 | Tudor David J | Director | Sell (S) | 3K | $295K |
| Feb 20, 2026 | YEARWOOD JOHN | Director | Buy (P) | 6K | $501K |
| Sep 11, 2025 | Varde Credit Partners Master, L.P. | 10% Owner | Sell (S) | 7K | $312K |
| Sep 11, 2025 | Varde Credit Partners Master, L.P. | 10% Owner | Sell (S) | 305K | $12.5M |
| Sep 5, 2023 | Kotts John P | Director | Sell (S) | 5K | $623K |
| Dec 15, 2021 | Kotts John P | Director | Sell (S) | 280 | $23K |
| Dec 15, 2021 | Kotts John P | Director | Sell (S) | 400 | $33K |
| Feb 28, 2020 | PETRELLO ANTHONY G | CHAIRMAN, PRESIDENT & CEO, Director | Buy (P) | 700 | $10K |
| Feb 27, 2020 | Restrepo William J | Chief Financial Officer | Buy (P) | 7K | $100K |
| Feb 27, 2020 | PETRELLO ANTHONY G | CHAIRMAN, PRESIDENT & CEO, Director | Buy (P) | 200 | $3K |
| Feb 25, 2020 | Restrepo William J | Chief Financial Officer | Buy (P) | 25K | $44K |
| Aug 8, 2019 | Beder Tanya S | Director | Buy (P) | 50K | $116K |
| Class | 13F holders | Value held |
|---|---|---|
| NBRthis pagecs | 231 funds | $946.5M |
| G6359F103COM | 1 funds | $47K |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for NBR
This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/stocks/NBR/capital-change-brief"
Use Arkolith's capital_change_brief for NBR. Tell me what changed, whether insider activity corroborates it, and cite the SEC evidence.
13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for NBR. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.