Security key
09062X103
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 131,083,249
- Total 13F value
- $18,365,221,765
- Share change
- +880,106
- Put/Call ratio
- 60%
- SEC-reported price per share
- $140.08
- Number of holders
- 894
- Value change
- +$165,798,563
- Number of buys
- 432
- Number of sells
- 341
- Shares outstanding
- 147,371,459
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q3 2025
Institutions
894
Top holders
10
BIIB full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q4 2025
Previous quarter: Q2 2025
BIOGEN INC. SEC filings
BIOGEN INC. company facts
BIOGEN INC. 13D/G history
Broader feeds
Reporting periods
Holder history for CUSIP 09062X103
Recent filing periods:
Ownership snapshot
Top reported holders of BIIB - BIOGEN INC. - COMMON STOCK (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
PRIMECAP MANAGEMENT CO/CA/
Disclosed value leader
VANGUARD GROUP INC
Comparable rows
15/15
Latest evidence
30 Sep 2025
13D/G
13F
3/4/5
Lead comparable stake: 10%
13D/G row: PRIMECAP MANAGEMENT CO/CA/
Showing 1-6 of 15 holder rows.
Quick read
PRIMECAP MANAGEMENT CO/CA/ leads the comparable SEC ownership view at 10%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens PRIMECAP MANAGEMENT CO/CA/'s linked filing trail.
Comparable ownership
Top 5
PRIMECAP MANAGEMENT CO/CA/
10%
BlackRock, Inc.
8.5%
STATE STREET CORP
5%
Caroline Dorsa
0.02%
VANGUARD GROUP INC
12%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| PRIMECAP MANAGEMENT CO/CA/ |
13D/G
13F
Company
|
10%
|
$2,094,853,956
14,954,697 shares
|
$0 | 30 Sep 2025 |
| BlackRock, Inc. |
13F
13D/G
Company
|
8.5%
from 13D/G
|
$1,702,431,056
13,555,466 shares
|
— | 30 Jun 2025 |
| STATE STREET CORP |
13D/G
13F
STATE STREET CORPORATION · Company
|
5%
|
$1,025,549,213
7,321,168 shares
|
$0 | 30 Sep 2025 |
| Caroline Dorsa |
3/4/5
Director
|
0.02%
|
$3,931,673
31,002 shares
|
— | 17 Jun 2025 |
| VANGUARD GROUP INC |
13F
Company
|
12%
|
$2,171,532,858
17,290,651 shares
|
— | 30 Jun 2025 |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
Company
|
3.3%
|
$602,633,568
4,798,420 shares
|
— | 30 Jun 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q3 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
894
Shares
131,083,249
Rows available
894
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q3 2025 vs Q2 2025 Across Filers
Q2 2025 holders
856
Q3 2025 holders
894
Holder diff
38
| Investor | Q2 2025 Shares | Q3 2025 Shares | Share Diff | Share Chg % | Q2 2025 value | Q3 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend