Latest Period
Q1 2026
Security Snapshot
BIOGEN INC. - COMMON STOCK (BIIB) Institutional Ownership
CUSIP: 09062X103
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
997
Shares (Excl. Options)
134,224,659
Price
$183.33
Save this security page for your next review
Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.
- Security type / class
- Equity / COMMON STOCK
- Symbol
- BIIB on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 134,224,659
- Total 13F value
- $24,600,929,665
- Portfolio coverage rank
- 0.01%
- Share change
- -5,565,510
- Value change
- -$977,181,894
- Number of holders
- 997
- Shares outstanding
- 147,371,459
- SEC-reported price per share
- $204.53
- Insider filing price
- $204.53
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- BIIB - BIOGEN INC. - COMMON STOCK is tracked under CUSIP 09062X103.
- 997 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 993 to 997 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $24,583,446,376 to $24,600,929,665.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 997 institutions filings for Q1 2026.
Security key
09062X103
Latest holder period
Q1 2026
13F holders
997
13D/G owners
5
CIK / CUSIP context first
Open Q1 2026 holders
BIIB full holder history
BIOGEN INC. SEC filings
BIOGEN INC. company facts
BIOGEN INC. insider transactions
BIOGEN INC. 13D/G history
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 09062X103:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
BIIB
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 11% | +29% | $3,406,032,940 | +$786,506,411 | 16,652,975 | +30% | FMR LLC | 29 May 2026 |
| PRIMECAP MANAGEMENT CO/CA/ | 10% | $2,094,853,956 | 14,954,697 | PRIMECAP MANAGEMENT CO/CA/ | 30 Sep 2025 | |||
| BlackRock, Inc. | 8.5% | $1,502,927,856 | 12,506,681 | BlackRock, Inc. | 31 Mar 2025 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 7.5% | $2,014,716,401 | 10,989,562 | Vanguard Capital Management | 31 Mar 2026 | |||
| STATE STREET CORP | 5% | $1,025,549,213 | 7,321,168 | STATE STREET CORPORATION | 30 Sep 2025 |
As of 31 Mar 2026, 997 institutional investors reported holding 134,224,659 shares of BIOGEN INC. - COMMON STOCK (BIIB). This represents 91% of the company’s total 147,371,459 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
66%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 11% | 15,974,601 | +7.9% | 0.05% | $2,928,623,480 |
| PRIMECAP MANAGEMENT CO/CA/ | 10% | 14,757,607 | -0% | 2.1% | $2,705,512,094 |
| FMR LLC | 8.7% | 12,807,541 | +36% | 0.12% | $2,348,006,582 |
| VANGUARD CAPITAL MANAGEMENT LLC | 6.5% | 9,537,417 | 0% | 0.04% | $1,748,494,659 |
| STATE STREET CORP | 4.9% | 7,167,922 | +0.12% | 0.05% | $1,314,095,140 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 4.4% | 6,531,727 | 0% | 0.06% | $1,197,461,511 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.9% | 4,342,602 | +3.4% | 0.05% | $793,387,370 |
| WELLINGTON MANAGEMENT GROUP LLP | 2% | 2,961,641 | -17% | 0.1% | $542,957,645 |
| MORGAN STANLEY | 1.5% | 2,170,940 | -6.6% | 0.02% | $397,998,875 |
| JPMORGAN CHASE & CO | 1.4% | 2,016,009 | +8.5% | 0.03% | $378,142,964 |
| AQR CAPITAL MANAGEMENT LLC | 1.3% | 1,923,557 | +26% | 0.16% | $346,240,270 |
| Invesco Ltd. | 1.2% | 1,745,255 | +5.4% | 0.05% | $319,957,584 |
| Boston Partners | 1.2% | 1,700,078 | -1.2% | 0.33% | $311,657,547 |
| NORTHERN TRUST CORP | 0.98% | 1,446,579 | +0.03% | 0.04% | $265,201,330 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.93% | 1,377,568 | -0.99% | 0.05% | $252,549,543 |
| Legal & General Group Plc | 0.92% | 1,349,832 | -7.5% | 0.06% | $247,464,698 |
| T. Rowe Price Investment Management, Inc. | 0.79% | 1,160,989 | -0.85% | 0.15% | $212,845,000 |
| BANK OF AMERICA CORP /DE/ | 0.78% | 1,156,369 | +2.4% | 0.02% | $211,997,128 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.78% | 1,149,394 | +0.48% | 0.03% | $210,718,402 |
| VAN ECK ASSOCIATES CORP | 0.73% | 1,079,861 | +1.3% | 0.15% | $197,970,000 |
| DIMENSIONAL FUND ADVISORS LP | 0.73% | 1,079,119 | +12% | 0.04% | $197,881,455 |
| DEUTSCHE BANK AG\ | 0.72% | 1,063,828 | +12% | 0.06% | $195,031,589 |
| GOLDMAN SACHS GROUP INC | 0.71% | 1,051,094 | -4.4% | 0.03% | $192,697,038 |
| Pictet Asset Management Holding SA | 0.62% | 913,328 | -3.6% | 0.18% | $168,272,179 |
| VANGUARD FIDUCIARY TRUST CO | 0.56% | 825,531 | 0% | 0.04% | $151,344,598 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 134,224,659 | $24,600,929,665 | -$977,181,894 | $183.33 | 997 |
| 2025 Q4 | 139,698,094 | $24,583,446,376 | +$1,492,805,786 | $175.99 | 993 |
| 2025 Q3 | 131,083,249 | $18,365,221,765 | +$165,798,563 | $140.08 | 894 |
| 2025 Q2 | 129,287,238 | $16,238,624,437 | +$284,309,412 | $125.59 | 856 |
| 2025 Q1 | 127,028,107 | $17,371,280,984 | -$578,239,538 | $136.84 | 865 |
| 2024 Q4 | 131,405,263 | $20,085,982,511 | +$272,768,825 | $152.92 | 861 |
| 2024 Q3 | 128,615,457 | $24,913,936,182 | -$143,640,766 | $193.84 | 903 |
| 2024 Q2 | 128,193,288 | $29,710,612,652 | -$84,741,446 | $231.82 | 933 |
| 2024 Q1 | 128,518,741 | $27,691,040,526 | +$55,007,555 | $215.63 | 932 |
| 2023 Q4 | 127,982,276 | $33,111,816,739 | +$901,376,761 | $258.77 | 993 |
| 2023 Q3 | 124,470,870 | $31,994,071,856 | -$470,206,356 | $257.01 | 954 |
| 2023 Q2 | 126,306,466 | $35,966,219,806 | +$277,366,431 | $284.85 | 994 |
| 2023 Q1 | 125,053,711 | $34,758,696,486 | +$300,589,329 | $278.03 | 987 |
| 2022 Q4 | 124,528,759 | $34,492,440,417 | +$242,887,240 | $276.92 | 1,018 |
| 2022 Q3 | 123,323,995 | $32,917,825,335 | +$384,787,916 | $267.00 | 966 |
| 2022 Q2 | 121,790,135 | $24,840,540,438 | -$152,960,663 | $203.94 | 911 |
| 2022 Q1 | 122,616,063 | $25,827,895,030 | -$220,078,557 | $210.60 | 941 |
| 2021 Q4 | 123,500,078 | $29,628,123,955 | -$101,746,917 | $239.92 | 996 |
| 2021 Q3 | 123,461,166 | $34,947,282,206 | -$614,669,326 | $282.99 | 1,026 |
| 2021 Q2 | 125,522,812 | $43,460,004,330 | -$566,581,701 | $346.27 | 1,091 |
| 2021 Q1 | 127,388,312 | $35,598,424,357 | -$380,775,241 | $279.75 | 1,079 |
| 2020 Q4 | 128,905,111 | $31,559,604,046 | -$521,085,738 | $244.86 | 1,047 |
| 2020 Q3 | 130,781,613 | $37,077,214,726 | -$1,220,436,591 | $283.68 | 1,036 |
| 2020 Q2 | 134,944,833 | $36,078,566,447 | -$2,622,299,974 | $267.55 | 1,048 |
| 2020 Q1 | 144,371,093 | $45,633,042,157 | -$2,072,462,238 | $316.38 | 1,090 |