BIOGEN INC. - COM (BIIB)

Historical Holders from Q1 2014 to Q4 2025

Type / Class: Equity / COM
Symbol: BIIB on Nasdaq
Shares outstanding: 146,614,676
Price per share: $175.99
All holders as of 30 Sep 2025: Q3 2025
Total 13F shares: 130,335,514
Total reported value: $18,260,470,667
% of total 13F portfolios: 0.01%
Share change: +952,191
Value change: +$176,045,898
Number of holders: 884
Price from insider filings: $175.99

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

Significant Owners of BIOGEN INC. - COM (BIIB) based on Schedule 13D/G filings

Filer	Ownership	Holdings Value	Nb Shares	Reporting Name	Report Period
PRIMECAP MANAGEMENT CO/CA/	10%	$2,094,853,956	14,954,697	PRIMECAP MANAGEMENT CO/CA/	30 Sep 2025
BlackRock, Inc.	8.5%	$1,506,929,994	12,506,681	BlackRock, Inc.	31 Mar 2025
STATE STREET CORP	5%	$1,025,549,213	7,321,168	STATE STREET CORPORATION	30 Sep 2025

As of 30 Sep 2025, BIOGEN INC. - COM (BIIB) has 884 institutional shareholders filing 13F forms. They hold 130,335,514 shares. of 146,614,676 outstanding shares (89%) .

Top 25 institutional shareholders own 63% of the company.

Filer	Ownership	Nb Shares	Share Change %	Portfolio %	Holdings Value
VANGUARD GROUP INC	12%	17,289,235	-0.01%	0.04%	$2,421,876,038
PRIMECAP MANAGEMENT CO/CA/	10%	14,954,697	-5.4%	1.6%	$2,094,853,953
BlackRock, Inc.	10%	14,763,952	+8.9%	0.04%	$2,068,134,447
STATE STREET CORP	5%	7,319,749	-2%	0.04%	$1,025,350,440
WELLINGTON MANAGEMENT GROUP LLP	2.9%	4,246,504	-12%	0.1%	$594,850,279
GEODE CAPITAL MANAGEMENT, LLC	2.8%	4,068,781	+3.8%	0.04%	$567,740,241
Point72 Asset Management, L.P.	2.6%	3,872,901	+1.1%	1.2%	$542,516,040
Invesco Ltd.	1.6%	2,418,127	+4.2%	0.05%	$338,731,160
MORGAN STANLEY	1.5%	2,251,535	+15%	0.02%	$315,395,300
AQR CAPITAL MANAGEMENT LLC	1.2%	1,783,581	+31%	0.16%	$248,809,475
Legal & General Group Plc	1.1%	1,593,399	+10%	0.05%	$223,203,335
NORTHERN TRUST CORP	1%	1,499,332	-2.4%	0.03%	$210,026,427
Pacer Advisors, Inc.	0.99%	1,451,249	+9.9%	0.52%	$203,290,960
UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC	0.98%	1,439,208	-17%	0.04%	$201,604,257
BARCLAYS PLC	0.93%	1,359,424	+70%	0.07%	$190,428,112
FMR LLC	0.88%	1,287,760	-23%	0.01%	$180,389,352
JPMORGAN CHASE & CO	0.87%	1,268,350	+27%	0.01%	$177,670,522
Balyasny Asset Management L.P.	0.84%	1,234,149	+48%	0.35%	$172,879,592
DEUTSCHE BANK AG\	0.84%	1,231,302	+9.6%	0.06%	$172,480,783
BANK OF AMERICA CORP /DE/	0.83%	1,220,018	+15%	0.01%	$170,900,120
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0.77%	1,123,349	+4.4%	0.03%	$157,358,728
MILLENNIUM MANAGEMENT LLC	0.76%	1,111,190	+64%	0.12%	$155,655,495
T. Rowe Price Investment Management, Inc.	0.73%	1,067,482	-23%	0.09%	$149,533,000
VAN ECK ASSOCIATES CORP	0.73%	1,066,931	-0.73%	0.14%	$149,456,000
GOLDMAN SACHS GROUP INC	0.73%	1,063,586	+59%	0.02%	$148,987,148

Institutional Holders of BIOGEN INC. - COM (BIIB) across Reporting Periods

Period	Reported Shares, Excl. Options	Value, Excl. Options	Value Change	Puts Notional Value	Calls Notional Value	Price	Investors
2025 Q4	401,728	$71,203,617	+$18,915,823			$175.99	34
2025 Q3	130,335,514	$18,260,470,667	+$176,045,898	$301,495,740	$505,034,873	$140.08	884
2025 Q2	129,287,238	$16,238,624,437	+$284,309,500	$299,301,011	$330,450,300	$125.59	856
2025 Q1	126,905,321	$17,354,478,928	-$578,946,113	$558,419,553	$286,262,196	$136.84	862
2024 Q4	131,340,394	$20,076,429,462	+$612,728,200	$329,465,719	$240,163,702	$152.92	851
2024 Q3	126,317,736	$24,468,537,519	-$714,790,175	$244,164,314	$182,248,736	$193.84	898
2024 Q2	128,383,987	$29,754,864,711	+$284,515,824	$284,001,854	$239,306,530	$231.82	928
2024 Q1	127,152,297	$27,396,393,746	-$328,447,788	$254,853,889	$251,171,229	$215.63	923
2023 Q4	570,062	$147,651,309	-$2,904,671	$0		$258.77	13
2023 Q3	122,456,511	$31,476,302,207	-$462,595,060	$437,522,836	$478,873,638	$257.01	935
2023 Q2	122,938,515	$35,007,055,136	-$823,600,550	$517,702,711	$474,214,258	$284.85	978
2023 Q1	123,092,608	$34,213,653,795	+$294,517,003	$556,318,999	$637,213,845	$278.03	970
2022 Q4	120,194,336	$33,292,114,949	+$172,014,088	$1,172,186,380	$979,696,444	$276.92	998
2022 Q3	107,161,289	$28,602,521,673	+$583,101,509	$1,335,777,500	$1,518,970,400	$267.00	943
2022 Q2	118,267,900	$23,960,545,792	-$395,912,866	$659,635,660	$597,052,066	$203.94	893
2022 Q1	122,108,683	$25,721,016,688	-$117,108,691	$705,134,820	$608,114,540	$210.60	925
2021 Q4	123,010,848	$29,508,708,117	-$87,864,895	$1,391,326,826	$880,549,523	$239.92	984
2021 Q3	109,005,520	$30,856,982,956	-$793,714,704	$1,572,313,973	$1,130,997,900	$282.99	1,022
2021 Q2	111,868,944	$38,732,153,132	-$965,085,932	$1,653,091,969	$1,584,285,592	$346.27	1,087
2021 Q1	113,447,640	$31,700,051,759	-$397,782,972	$1,252,767,350	$1,266,372,400	$279.75	1,078
2020 Q4	128,032,712	$31,346,245,073	-$509,592,628	$1,401,325,620	$1,395,027,238	$244.86	1,039
2020 Q3	114,162,973	$32,365,653,378	-$1,194,834,405	$1,312,064,000	$1,066,618,132	$283.68	1,028
2020 Q2	117,138,388	$31,314,878,501	-$2,350,341,523	$1,206,153,000	$675,868,000	$267.55	1,034
2020 Q1	126,709,071	$40,045,229,799	-$2,176,332,017	$1,296,755,015	$1,021,601,020	$316.38	1,079
2019 Q4	133,574,564	$39,604,538,655	-$2,293,013,345	$1,468,045,000	$1,078,908,000	$296.73	1,080
2019 Q3	158,131,900	$36,800,088,232	-$345,789,739	$1,121,619,000	$945,384,000	$232.82	965
2019 Q2	159,424,239	$37,275,599,740	-$1,549,272,435	$997,103,000	$758,162,000	$233.87	993
2019 Q1	171,163,807	$40,429,935,341	-$1,008,119,296	$1,116,276,000	$934,721,002	$236.38	1,060
2018 Q4	168,573,343	$50,685,180,264	-$608,505,226	$1,063,063,000	$874,162,000	$300.92	1,126
2018 Q3	171,050,992	$60,397,032,672	-$345,793,831	$1,545,142,002	$972,501,009	$353.31	1,131
2018 Q2	177,640,802	$51,526,967,259	-$1,778,987,723	$1,012,338,019	$672,830,015	$290.24	1,081
2018 Q1	182,846,339	$50,051,250,844	-$606,136,295	$886,640,807	$659,854,315	$273.82	1,088
2017 Q4	187,801,527	$59,800,563,412	+$8,735,383	$1,191,765,708	$915,627,478	$318.57	1,108
2017 Q3	187,265,283	$58,619,371,628	+$470,268,951	$1,047,677,004	$911,399,187	$313.12	1,004
2017 Q2	186,273,166	$50,536,168,156	+$222,349,646	$983,292,028	$865,149,053	$271.36	984
2017 Q1	187,110,570	$51,155,566,891	+$4,112,134,034	$892,220,000	$740,425,000	$273.42	1,009
2016 Q4	187,429,233	$53,122,602,355	-$971,224,326	$1,419,623,000	$1,447,446,000	$283.58	1,015
2016 Q3	190,740,581	$59,686,219,983	+$437,160,614	$1,379,917,000	$1,321,221,231	$313.03	1,001
2016 Q2	190,759,777	$46,243,528,087	-$117,523,974	$1,065,300,000	$866,807,000	$241.82	953
2016 Q1	189,145,535	$49,301,552,399	-$280,159,779	$955,080,000	$756,666,000	$260.32	933
2015 Q4	190,372,465	$58,410,852,053	-$2,559,309,169	$1,398,205,000	$966,467,000	$306.35	960
2015 Q3	198,942,926	$58,054,133,406	-$3,918,900,009	$1,517,120,000	$937,485,000	$291.81	913
2015 Q2	206,942,524	$83,591,083,851	-$954,241,463	$1,414,609,000	$838,737,000	$403.94	955
2015 Q1	212,734,718	$89,771,237,671	+$220,609,849	$1,349,116,000	$747,612,000	$422.24	955
2014 Q4	211,803,992	$71,917,734,965	-$713,321,934	$1,187,656,000	$842,718,000	$339.45	873
2014 Q3	213,172,625	$70,516,050,109	-$285,728,160	$1,011,949,000	$617,729,000	$330.81	809
2014 Q2	214,730,824	$67,713,259,435	+$1,009,473,867	$938,131,000	$617,443,000	$315.31	773
2014 Q1	211,772,968	$64,742,428,089	-$451,615,137	$1,040,252,000	$691,642,000	$305.87	764