Who owns NBIX (NBIX)
Which tracked institutional funds hold NBIX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See NBIX 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
125 tracked funds added or opened NBIX while 233 trimmed or exited it between 2025-Q4 and 2026-Q1 — 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
NBIX’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 NBIX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in NBIX 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 692 tracked filers holding NBIX, 378 increased or opened the position and 344 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 NBIX 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 36
- VANGUARD PORTFOLIO MANAGEMENT LLC$623M
- VANGUARD CAPITAL MANAGEMENT LLC$594M
- Vestal Point Capital, LP$165M
- VANGUARD FIDUCIARY TRUST CO$84M
- Defilade Capital Management, L.P.$28M
- PANAGORA ASSET MANAGEMENT INC$20M
Full exits 65
- VANGUARD GROUP INC$1.4B
- TWO SIGMA ADVISERS, LP$120M
- Zurich Insurance Group Ltd/FI$65M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$51M
- ORBIMED ADVISORS LLC$45M
- BRAUN STACEY ASSOCIATES INC$26M
Largest adds
- TWO SIGMA INVESTMENTS, LP$264M
- AQR CAPITAL MANAGEMENT LLC$188M
- MILLENNIUM MANAGEMENT LLC$102M
- VICTORY CAPITAL MANAGEMENT INC$79M
- JACOBS LEVY EQUITY MANAGEMENT, INC$64M
- FIRST TRUST ADVISORS LP$57M
Largest trims
- BlackRock, Inc.$435M
- PRICE T ROWE ASSOCIATES INC /MD/$246M
- Bellevue Group AG$241M
- LOS ANGELES CAPITAL MANAGEMENT LLC$159M
- DEERFIELD MANAGEMENT COMPANY, L.P.$88M
- WELLINGTON MANAGEMENT GROUP LLP$66M
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 | 10,509,674 | $1.4B | 10.5% | 2026-Q1 |
| DODGE & COX trimmed | 5,461,037 | $719M | 5.5% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 5,442,067 | $701M | 5.3% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 4,937,882 | $651M | 4.9% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 4,726,344 | $623M | 4.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 4,511,904 | $594M | 4.5% | 2026-Q1 |
| STATE STREET CORP added | 4,354,526 | $574M | 4.4% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 3,060,570 | $403M | 3.1% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 2,418,897 | $319M | 2.4% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,136,672 | $281M | 2.1% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 1,493,813 | $197M | 1.5% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 1,380,928 | $182M | 1.4% | 2026-Q1 |
| Vestal Point Capital, LP added | 1,250,000 | $165M | 1.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 1,247,447 | $164M | 1.2% | 2026-Q1 |
| NORTHERN TRUST CORP added | 1,242,830 | $164M | 1.2% | 2026-Q1 |
| UBS Group AG added | 1,221,036 | $161M | 1.2% | 2026-Q1 |
| MORGAN STANLEY added | 1,219,196 | $161M | 1.2% | 2026-Q1 |
| RTW INVESTMENTS, LP | 1,062,072 | $140M | 1.1% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 959,217 | $126M | 1.0% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 902,788 | $119M | 0.9% | 2026-Q1 |
| NORGES BANK trimmed | 999,821 | $111M | 0.8% | 2026-Q1 |
| IEQ CAPITAL, LLC added | 765,982 | $101M | 0.8% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 731,609 | $96M | 0.7% | 2026-Q1 |
| ARMISTICE CAPITAL, LLC trimmed | 724,000 | $95M | 0.7% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 711,762 | $94M | 0.7% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 702,492 | $93M | 0.7% | 2026-Q1 |
| BRAIDWELL LP trimmed | 652,121 | $86M | 0.7% | 2026-Q1 |
| Fiera Capital Corp added | 651,255 | $86M | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 634,340 | $84M | 0.6% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 611,264 | $81M | 0.6% | 2026-Q1 |
| DEERFIELD MANAGEMENT COMPANY, L.P. trimmed | 610,000 | $80M | 0.6% | 2026-Q1 |
| Pictet Asset Management Holding SA trimmed | 602,643 | $79M | 0.6% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 601,487 | $78M | 0.6% | 2026-Q1 |
| GW&K Investment Management, LLC added | 593,725 | $78M | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 583,827 | $77M | 0.6% | 2026-Q1 |
| Swedbank AB trimmed | 579,429 | $76M | 0.6% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 571,719 | $75M | 0.6% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 523,533 | $74M | 0.6% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 520,269 | $69M | 0.5% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 512,033 | $67M | 0.5% | 2026-Q1 |
| MARSHALL WACE, LLP added | 508,977 | $67M | 0.5% | 2026-Q1 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 496,340 | $65M | 0.5% | 2026-Q1 |
| Squarepoint Ops LLC added | 487,953 | $64M | 0.5% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 466,977 | $62M | 0.5% | 2026-Q1 |
| Nuveen, LLC added | 443,052 | $58M | 0.4% | 2026-Q1 |
| Man Group plc added | 415,909 | $55M | 0.4% | 2026-Q1 |
| Hood River Capital Management LLC added | 404,393 | $53M | 0.4% | 2026-Q1 |
| Hudson Bay Capital Management LP added | 395,850 | $52M | 0.4% | 2026-Q1 |
| Legal & General Group Plc added | 380,589 | $50M | 0.4% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 365,345 | $48M | 0.4% | 2026-Q1 |
| Gotham Asset Management, LLC added | 360,136 | $47M | 0.4% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 350,710 | $46M | 0.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 349,179 | $46M | 0.3% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC trimmed | 332,408 | $44M | 0.3% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 332,300 | $44M | 0.3% | 2026-Q1 |
| Clearbridge Investments, LLC trimmed | 310,035 | $41M | 0.3% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 303,820 | $40M | 0.3% | 2026-Q1 |
| Invesco Ltd. trimmed | 298,615 | $39M | 0.3% | 2026-Q1 |
| Swiss National Bank added | 292,600 | $39M | 0.3% | 2026-Q1 |
| Rockefeller Capital Management L.P. trimmed | 282,097 | $37M | 0.3% | 2026-Q1 |
| Candriam S.C.A. trimmed | 275,064 | $36M | 0.3% | 2026-Q1 |
| RENAISSANCE GROUP LLC trimmed | 246,377 | $32M | 0.2% | 2026-Q1 |
| BARCLAYS PLC trimmed | 243,984 | $32M | 0.2% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 238,161 | $31M | 0.2% | 2026-Q1 |
| WORLDQUANT MILLENNIUM ADVISORS LLC added | 237,904 | $31M | 0.2% | 2026-Q1 |
| SEI INVESTMENTS CO added | 235,251 | $31M | 0.2% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 233,500 | $31M | 0.2% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 231,311 | $30M | 0.2% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 225,051 | $30M | 0.2% | 2026-Q1 |
| California Public Employees Retirement System added | 222,441 | $29M | 0.2% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. added | 220,449 | $29M | 0.2% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 219,755 | $29M | 0.2% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 218,710 | $29M | 0.2% | 2026-Q1 |
| PFM Health Sciences, LP added | 215,678 | $28M | 0.2% | 2026-Q1 |
| Defilade Capital Management, L.P. new | 209,932 | $28M | 0.2% | 2026-Q1 |
| Amundi added | 203,637 | $27M | 0.2% | 2026-Q1 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 195,741 | $26M | 0.2% | 2026-Q1 |
| Handelsbanken Fonder AB trimmed | 187,867 | $25M | 0.2% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 184,222 | $24M | 0.2% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC | 184,035 | $24M | 0.2% | 2026-Q1 |
| Trexquant Investment LP added | 183,310 | $24M | 0.2% | 2026-Q1 |
| Ensign Peak Advisors, Inc added | 181,481 | $24M | 0.2% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND | 174,774 | $23M | 0.2% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 165,735 | $22M | 0.2% | 2026-Q1 |
| Mariner, LLC added | 160,869 | $21M | 0.2% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 9,568,109 | $1.4B | 10.3% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 842,592 | $120M | 0.9% | 2025-Q4 stale |
| JENNISON ASSOCIATES LLC trimmed | 519,953 | $73M | 0.6% | 2025-Q3 stale |
| Zurich Insurance Group Ltd/FI added | 459,437 | $65M | 0.5% | 2025-Q4 stale |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 360,711 | $51M | 0.4% | 2025-Q4 stale |
| AXA Investment Managers S.A. new | 323,896 | $45M | 0.3% | 2025-Q3 stale |
| ORBIMED ADVISORS LLC trimmed | 314,240 | $45M | 0.3% | 2025-Q4 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 341,578 | $43M | 0.3% | 2025-Q2 stale |
| SOROS FUND MANAGEMENT LLC added | 239,823 | $27M | 0.2% | 2025-Q1 stale |
| BRAUN STACEY ASSOCIATES INC trimmed | 182,262 | $26M | 0.2% | 2025-Q4 stale |
| First Turn Management, LLC new | 181,897 | $26M | 0.2% | 2025-Q3 stale |
| Soleus Capital Management, L.P. added | 175,982 | $25M | 0.2% | 2025-Q4 stale |
| Eagle Health Investments LP | 162,800 | $23M | 0.2% | 2025-Q4 stale |
| BOONE CAPITAL MANAGEMENT LLC trimmed | 151,815 | $22M | 0.2% | 2025-Q4 stale |
| TANG CAPITAL MANAGEMENT LLC | 150,000 | $21M | 0.2% | 2025-Q3 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.