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.
| # | 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 | ▲New +9.5M sh | Q1 2026 | |
| 5 | STATE STREET CORP | $1.3B | 7.2M | ▲+0.1% Added · +9K sh | Q1 2026 | |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | $1.2B | 6.5M | ▲New +6.5M sh | Q1 2026 | |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | $793.4M | 4.3M | ▲+3.4% Added · +143K sh | Q1 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 | ▲New +826K sh | 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.
| Date | Insider | Role | Action | Shares | Value |
|---|---|---|---|---|---|
| Jun 9, 2026 | Freire Maria C | Director | Grant (A) | 2K | $0 |
| Jun 9, 2026 | Minor Lloyd | Director | Grant (A) | 2K | $0 |
| Jun 9, 2026 | Mantas Jesus B | Director | Grant (A) | 2K | $0 |
| Jun 9, 2026 | Pangalos Menelas N | Director | Option exercise (M) | 2K | $0 |
| Jun 9, 2026 | Pangalos Menelas N | Director | Grant (A) | 2K | $0 |
| Jun 9, 2026 | Pangalos Menelas N | Director | Option exercise (M) | 2K | $0 |
| Jun 9, 2026 | LANGER SUSAN | Director | Grant (A) | 2K | $0 |
| Jun 9, 2026 | Patolawala Monish D | Director | Grant (A) | 2K | $0 |
| Jun 9, 2026 | SHERWIN STEPHEN A | Director | Grant (A) | 2K | $0 |
| Jun 9, 2026 | Rowinsky Eric K | Director | Grant (A) | 2K | $0 |
| Jun 9, 2026 | HAWKINS WILLIAM A | Director | Grant (A) | 2K | $0 |
| May 1, 2026 | Keeney Adam | Head of Corporate Development | Option exercise (M) | 939 | $0 |
| Company | Co-held by | Combined value |
|---|---|---|
| META PLATFORMS INC-CLASS AMETA | 324 funds | $115.1B |
| NVIDIA CORPNVDA | 322 funds | $393.3B |
| AMAZON.COM INCAMZN | 322 funds | $209.7B |
| APPLE INCAAPL | 318 funds | $302.1B |
| MICROSOFT CORPMSFT | 318 funds | $276.5B |
| BROADCOM INCAVGO | 318 funds | $146.0B |
| ELI LILLY & COLLY | 318 funds | $84.7B |
| ALPHABET INC-CL AGOOGL | 314 funds | $177.5B |
| MERCK & CO. INC.MRK | 314 funds | $32.9B |
| JPMORGAN CHASE & COJPM | 312 funds | $75.2B |
| VISA INC-CLASS A SHARESV | 312 funds | $61.1B |
| ALPHABET INC-CL CGOOG | 311 funds | $120.1B |
Ranked by how many of BIIB's institutional holders also hold each name, a cross-fund conviction signal. Via the MCP server (ticker.co_held).
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. Every panel above is one call to the Arkolith API & MCP server.