Company · Ownership research

BIOGEN INC. BIIB

CIK 0000875045 · CUSIP 09062X103

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 09062X103 (BIIB), not CUSIP 09062X903 (BIIB), CUSIP 09062X953 (BIIB), CUSIP 09052V100 (BIIB), and does not merge CUSIPs.

This page lists the top 20 of 533 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$1.01B 4,507,404 shares	0.05%	+58.11K(+1.30%)Added	SEC filing ↗ Nov 6, 2026	▾
02	Amundi CIK 1330387 · View history	$297.38M 1,316,534 shares	0.06%	-200.30K(-13.20%)Reduced	SEC filing ↗ Nov 6, 2026	▾
03	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$261.59M 1,158,052 shares	0.05%	+9.48K(+0.80%)Added	SEC filing ↗ Nov 4, 2026	▾
04	DEUTSCHE BANK AG\ CIK 948046 · View history	$195.38M 864,971 shares	0.05%	-29.06K(-3.30%)Reduced	SEC filing ↗ Nov 6, 2026	▾
05	Pictet Asset Management Holding SA CIK 1993888 · View history	$188.23M 832,444 shares	0.18%	-19.38K(-2.30%)Reduced	SEC filing ↗ Nov 3, 2026	▾
06	Bank of New York Mellon Corp CIK 1390777 · View history	$171.63M 759,838 shares	0.03%	-13.78K(-1.80%)Reduced	SEC filing ↗ Nov 5, 2026	▾
07	CITIGROUP INC CIK 831001 · View history	$168.70M 746,858 shares	0.08%	+12.34K(+1.70%)Added	SEC filing ↗ Nov 4, 2026	▾
08	Robeco Institutional Asset Management B.V. CIK 1418773 · View history	$148.28M 656,465 shares	0.18%	-134.63K(-17.00%)Reduced	SEC filing ↗ Oct 20, 2026	▾
09	Artemis Investment Management LLP CIK 1535385 · View history	$131.41M 581,774 shares	1.15%	+10.80K(+1.90%)Added	SEC filing ↗ Oct 8, 2026	▾
10	LSV ASSET MANAGEMENT CIK 1050470 · View history	$98.95M 438,072 shares	0.18%	-5.98K(-1.30%)Reduced	SEC filing ↗ Nov 6, 2026	▾
11	Candriam S.C.A. CIK 1537014 · View history	$93.51M 412,472 shares	0.42%	+28.15K(+7.30%)Added	SEC filing ↗ Nov 3, 2026	▾
12	B. Metzler seel. Sohn & Co. AG CIK 1847838 · View history	$91.17M 403,636 shares	0.79%	+391.38K(+3,192.80%)Added	SEC filing ↗ Oct 30, 2026	▾
13	Mitsubishi UFJ Asset Management Co., Ltd. CIK 1466546 · View history	$86.96M 384,969 shares	0.04%	+26.15K(+7.30%)Added	SEC filing ↗ Nov 5, 2026	▾
14	Fisher Asset Management, LLC CIK 850529 · View history	$81.94M 362,773 shares	0.02%	+24.75K(+7.30%)Added	SEC filing ↗ Nov 6, 2026	▾
15	ANTIPODES PARTNERS Ltd CIK 1652442 · View history	$77.33M 342,366 shares	1.42%	+255.54K(+294.30%)Added	SEC filing ↗ Nov 5, 2026	▾
16	Sumitomo Mitsui Trust Group, Inc. CIK 1475365 · View history	$76.05M 336,692 shares	0.04%	-9.93K(-2.90%)Reduced	SEC filing ↗ Oct 29, 2026	▾
17	Swedbank AB CIK 946431 · View history	$72.84M 322,494 shares	0.06%	+1.87K(+0.60%)Added	SEC filing ↗ Oct 27, 2026	▾
18	KBC Group NV CIK 1411133 · View history	$65.30M 289,080 shares	0.14%	+10.43K(+3.70%)Added	SEC filing ↗ Oct 22, 2026	▾
19	BARCLAYS PLC CIK 312069 · View history	$45.35M 200,767 shares	0.02%	-46.39K(-18.80%)Reduced	SEC filing ↗ Nov 6, 2026	▾
20	AEGON ASSET MANAGEMENT UK Plc CIK 1539994 · View history	$44.13M 195,359 shares	0.47%	-45.74K(-19.00%)Reduced	SEC filing ↗ Nov 4, 2026	▾

Showing 20 / 533 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

533

Cancelled or null records excluded

Disclosed shares

20,179,959

Not deduplicated across managers

Disclosed value

$4.55B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

BIOGEN INC. · Q3 2026

Explore all 533 reporting institutions.

This page includes 20 of 533 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.