BIIB
Biogen Inc.Company with tickers: BIIB
CIK
875045
CUSIP
09062X103
Shares Outstanding
147,637,117
Website
https://www.biogen.com
13F Activity (30d)
61 filings
17 filers
Registered funds — mutual funds, ETFs and closed-end funds — whose latest Form N-PORT portfolio report holds this stock, matched by the stock's CUSIP. Each row is one fund position with its size, value and weight in that fund.
Funds holding BIIB
581 fund positions| Fund | Ticker | Balance | Value | % of Fund | Side | Reported | Open |
|---|---|---|---|---|---|---|---|
| VANGUARD PRIMECAP FUND | — | 8,359,880 | $1,532,616,800 | 2.12% | Long | 2026-03-31 | |
| VANGUARD TOTAL STOCK MARKET INDEX FUND | — | 4,654,936 | $853,389,417 | 0.04% | Long | 2026-03-31 | |
| VANGUARD 500 INDEX FUND | — | 3,730,577 | $683,926,681 | 0.05% | Long | 2026-03-31 | |
| Fidelity Contrafund | — | 3,269,520 | $599,401,102 | 0.38% | Long | 2026-03-31 | |
| VANGUARD MID-CAP INDEX FUND | — | 3,169,409 | $581,047,752 | 0.29% | Long | 2026-03-31 | |
| VANGUARD CAPITAL OPPORTUNITY FUND | — | 2,332,567 | $427,629,508 | 1.74% | Long | 2026-03-31 | |
| Fidelity 500 Index Fund | — | 1,866,971 | $358,122,377 | 0.05% | Long | 2026-02-28 | |
| iShares Core S&P 500 ETF | — | 1,888,033 | $346,133,090 | 0.05% | Long | 2026-03-31 | |
| State Street(R) SPDR(R) S&P 500(R) ETF Trust | SPY | 1,716,790 | $314,739,111 | 0.05% | Long | 2026-03-31 | |
| VANGUARD VALUE INDEX FUND | — | 1,357,618 | $248,892,108 | 0.11% | Long | 2026-03-31 | |
| VANGUARD PRIMECAP CORE FUND | — | 1,316,936 | $241,433,877 | 1.78% | Long | 2026-03-31 | |
| Strategic Advisers Fidelity U.S. Total Stock Fund | — | 1,242,366 | $238,310,646 | 0.11% | Long | 2026-02-28 | |
| iShares Biotechnology ETF | — | 1,091,046 | $200,021,463 | 2.46% | Long | 2026-03-31 | |
| State Street(R) Health Care Select Sector SPDR(R) ETF | — | 1,067,952 | $195,787,640 | 0.51% | Long | 2026-03-31 | |
| VANGUARD MID-CAP VALUE INDEX FUND | — | 954,017 | $174,899,937 | 0.50% | Long | 2026-03-31 | |
| VANGUARD INSTITUTIONAL INDEX FUND | — | 827,362 | $151,680,275 | 0.05% | Long | 2026-03-31 | |
| Disciplined Value Mid Cap Fund | — | 781,583 | $143,287,611 | 0.65% | Long | 2026-03-31 | |
| Fidelity Contrafund K6 | — | 719,692 | $131,941,134 | 0.39% | Long | 2026-03-31 | |
| Fidelity Puritan Fund | — | 644,300 | $123,589,626 | 0.38% | Long | 2026-02-28 | |
| iShares Russell Mid-Cap ETF | — | 558,815 | $102,447,554 | 0.21% | Long | 2026-03-31 | |
| T. Rowe Price Mid-Cap Growth Fund, Inc. | — | 497,200 | $91,151,676 | 0.40% | Long | 2026-03-31 | |
| VANGUARD HEALTH CARE INDEX FUND | — | 440,425 | $84,482,324 | 0.42% | Long | 2026-02-28 | |
| State Street(R) SPDR(R) S&P(R) Biotech ETF | — | 444,855 | $81,555,267 | 1.10% | Long | 2026-03-31 | |
| First Trust NYSE Arca Biotechnology Index Fund | — | 429,853 | $78,804,950 | 3.47% | Long | 2026-03-31 | |
| MFS Mid Cap Value Fund | — | 414,847 | $76,053,901 | 0.48% | Long | 2026-03-31 | |
| BlackRock Health Sciences Opportunities Portfolio | — | 364,188 | $69,858,542 | 1.07% | Long | 2026-02-27 | |
| iShares Russell 1000 Value ETF | — | 335,747 | $61,552,498 | 0.09% | Long | 2026-03-31 | |
| Select Biotechnology Portfolio | — | 299,435 | $57,437,622 | 1.07% | Long | 2026-02-28 | |
| State Street(R) SPDR(R) Portfolio S&P 500(R) ETF | — | 308,328 | $56,525,772 | 0.05% | Long | 2026-03-31 | |
| Fidelity Total Market Index Fund | — | 274,195 | $52,596,085 | 0.04% | Long | 2026-02-28 | |
| CAPITAL GROWTH PORTFOLIO | — | 263,550 | $48,316,622 | 2.10% | Long | 2026-03-31 | |
| iShares S&P 500 Value ETF | — | 253,224 | $46,423,556 | 0.10% | Long | 2026-03-31 | |
| Patient Opportunity Trust | — | 250,000 | $45,832,500 | 2.64% | Long | 2026-03-31 | |
| T. Rowe Price Equity Income Fund | — | 237,000 | $43,449,210 | 0.27% | Long | 2026-03-31 | |
| Fidelity Series Total Market Index Fund | — | 216,917 | $41,609,019 | 0.04% | Long | 2026-02-28 | |
| iShares Russell Mid-Cap Value ETF | — | 210,347 | $38,562,916 | 0.27% | Long | 2026-03-31 | |
| Goldman Sachs ActiveBeta(R) U.S. Large Cap Equity ETF | — | 195,918 | $37,580,991 | 0.26% | Long | 2026-02-28 | |
| Schwab Fundamental U.S. Large Company ETF | — | 179,440 | $34,420,181 | 0.14% | Long | 2026-02-28 | |
| iShares Core S&P Total U.S. Stock Market ETF | — | 185,286 | $33,968,482 | 0.04% | Long | 2026-03-31 | |
| JPMorgan Large Cap Value Fund | — | 182,195 | $33,401,809 | 0.68% | Long | 2026-03-31 | |
| Fidelity Fund | — | 178,000 | $32,632,740 | 0.39% | Long | 2026-03-31 | |
| State Street(R) SPDR(R) Portfolio S&P 500(R) Value ETF | — | 172,483 | $31,621,308 | 0.10% | Long | 2026-03-31 | |
| VANGUARD LARGE-CAP INDEX FUND | — | 172,280 | $31,584,092 | 0.05% | Long | 2026-03-31 | |
| Schwab U.S. Large-Cap ETF | — | 150,604 | $28,888,859 | 0.05% | Long | 2026-02-28 | |
| Bridge Builder Large Cap Value Fund | — | 152,089 | $27,882,476 | 0.11% | Long | 2026-03-31 | |
| Fidelity Advisor Diversified Stock Fund | — | 139,000 | $25,482,870 | 0.70% | Long | 2026-03-31 | |
| BlackRock Health Sciences Term Trust | BMEZ | 137,487 | $25,205,492 | 2.49% | Long | 2026-03-31 | |
| THE U.S. LARGE CAP VALUE SERIES | — | 139,082 | $25,019,461 | 0.09% | Long | 2026-01-31 | |
| S&P 500 Index Master Portfolio | — | 134,491 | $24,656,235 | 0.05% | Long | 2026-03-31 | |
| Fidelity Growth Company Fund | — | 120,535 | $23,121,024 | 0.03% | Long | 2026-02-28 |
Showing 1–50 of 581 positions