907 tracked 13F filers disclose a position in BIIB as of the latest SEC 13F filings, a combined $23.8B 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. | $2.9B | 16.0M | ▲+7.8% Added · +1.2M sh | Q1 2026 | |
| 2 | PRIMECAP MANAGEMENT CO/CA/ | $2.7B | 14.8M | ▼~0% Reduced · −390 sh | Q1 2026 | |
| 3 | FMR LLC | $2.3B | 12.8M | ▲+36% Added · +3.4M sh | Q1 2026 | |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $1.7B | 9.5M | →First observed position No prior filed position | Q1 2026 | |
| 5 | STATE STREET CORP | $1.6B | 7.3M | ▲+2.5% Added · +176K sh | Q2 2026 | |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | $1.2B | 6.5M | →First observed position No prior filed position | Q1 2026 | |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $957.9M | 4.4M | ▲+2.5% Added · +107K sh | Q2 2026 | |
| 8 | NORGES BANK | $464.4M | 2.6M | ▲+17% Added · +375K sh | Q4 2025 | |
| 9 | MORGAN STANLEY | $398.0M | 2.2M | ▼−6.6% Reduced · −154K sh | Q1 2026 | |
| 10 | JPMORGAN CHASE & CO | $378.1M | 2.0M | ▲+8.5% Added · +159K sh | Q1 2026 | |
| 11 | AQR CAPITAL MANAGEMENT LLC | $346.2M | 1.9M | ▲+26% Added · +395K sh | Q1 2026 | |
| 12 | Boston Partners | $311.7M | 1.7M | ▼−1.2% Reduced · −21K sh | Q1 2026 | |
| 13 | NORTHERN TRUST CORP | $265.2M | 1.4M | ▲~0% Added · +453 sh | Q1 2026 | |
| 14 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME | $252.5M | 1.4M | ▼−1.0% Reduced · −14K sh | Q1 2026 | |
| 15 | Legal & General Group Plc | $247.5M | 1.3M | ▼−7.5% Reduced · −110K sh | Q1 2026 | |
| 16 | T. Rowe Price Investment Management, Inc. | Withheld | 1.2M | ▼−0.8% Reduced · −10K sh | Q1 2026 | |
| 17 | BANK OF AMERICA CORP /DE/ | $212.0M | 1.2M | ▲+2.4% Added · +28K sh | Q1 2026 | |
| 18 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $210.7M | 1.1M | ▲+0.5% Added · +5K sh | Q1 2026 | |
| 19 | VAN ECK ASSOCIATES CORP | Withheld | 1.1M | ▲+1.3% Added · +14K sh | Q1 2026 | |
| 20 | DIMENSIONAL FUND ADVISORS LP | $197.9M | 1.1M | ▲+12% Added · +118K sh | Q1 2026 | |
| 21 | DEUTSCHE BANK AG\ | $195.0M | 1.1M | ▲+12% Added · +110K sh | Q1 2026 | |
| 22 | GOLDMAN SACHS GROUP INC | $192.7M | 1.1M | ▼−4.4% Reduced · −48K sh | Q1 2026 | |
| 23 | Pictet Asset Management Holding SA | $168.3M | 913K | ▼−3.6% Reduced · −34K sh | Q1 2026 | |
| 24 | VANGUARD FIDUCIARY TRUST CO | $151.3M | 826K | →First observed position No prior filed position | Q1 2026 | |
| 25 | Point72 Asset Management, L.P. | $148.4M | 810K | ▼−71% Reduced · −2.0M 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, 0 funds opened a new position in BIIB and 28 added to an existing one, while 23 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 |
|---|---|---|
| MICROSOFT CORPMSFT | 549 funds | $325.2B |
| NVIDIA CORPNVDA | 545 funds | $472.8B |
| APPLE INCAAPL | 545 funds | $369.8B |
| AMAZON.COM INCAMZN | 545 funds | $245.6B |
| ALPHABET INC-CL AGOOGL | 538 funds | $211.8B |
| META PLATFORMS INC-CLASS AMETA | 538 funds | $134.7B |
| ELI LILLY & COLLY | 538 funds | $102.1B |
| BROADCOM INCAVGO | 529 funds | $180.4B |
| MERCK & CO. INC.MRK | 529 funds | $36.7B |
| JOHNSON & JOHNSONJNJ | 527 funds | $59.9B |
| JPMORGAN CHASE & COJPM | 523 funds | $86.9B |
| ALPHABET INC-CL CGOOG | 520 funds | $146.2B |
Ranked by how many of BIIB's institutional holders also hold each name, a cross-fund conviction signal.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Aug 4, 2026 | Minor Lloyd | Director | Sell (S) | 593 | $119K |
| Aug 3, 2026 | Minor Lloyd | Director | Sell (S) | 593 | $121K |
| Feb 12, 2026 | Murphy Nicole | Head of Pharm Ops and Tech | Buy (P) | 3 | $585 |
| Feb 9, 2026 | Singhal Priya | Head of Development | Sell (S) | 3K | $532K |
| Feb 2, 2026 | Singhal Priya | Head of Development | Sell (S) | 748 | $134K |
| Sep 2, 2025 | Singhal Priya | Head of Development | Sell (S) | 517 | $69K |
| Jul 8, 2025 | Izzar Rachid | Head of Global Product Strat. | Sell (S) | 2K | $300K |
| May 19, 2025 | Singhal Priya | Head of Development | Sell (S) | 4K | $481K |
| May 2, 2025 | DORSA CAROLINE | Director | Buy (P) | 1K | $152K |
| Mar 7, 2025 | SHERWIN STEPHEN A | Director | Sell (S) | 9K | $1.3M |
| Dec 9, 2024 | Singhal Priya | Head of Development | Sell (S) | 110 | $17K |
| Sep 3, 2024 | Singhal Priya | Head of Development | Sell (S) | 431 | $88K |
| Class | 13F holders | Value held |
|---|---|---|
| BIIBthis pagecs | 907 funds | $23.8B |
| 09062XAD5Corporate Bond - Domestic | 1 funds | $157K |
| 09062XAM5Corporate Bond - Domestic | 1 funds | $150K |
Same issuer, multiple share classes. The consensus leaderboards count this company once across all classes; this is the per-class detail.
Connected entities for BIIB
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/BIIB/capital-change-brief"
Use Arkolith's capital_change_brief for BIIB. 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 BIIB. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.