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BIIBBIIB
17 quarters

Position history for Boston PartnersBoston Partners's holdings in BIOGEN INC

Yes. Boston Partners holds 1,263,429 shares of BIIB (Biogen), worth $272.8M, as of its Q2 2026 13F filing. It reduced the position by 436,649 shares (-25.7%) from Q1 2026. Boston Partners has held BIIB since Q4 2025, across 3 quarterly 13F filings. BIIB is 0.2% of Boston Partners' reported 13F portfolio.

Current Value

$272.8M

Current Shares

1.3M

Total Value Change

+$219.9M

Total Shares Change

+1.1M

Quarter-by-Quarter History
QuarterActionSharesChangeValueWeightPriceConviction
2026-Q2
Latest
Decreased
1.3M
-25.7%
$272.8M0.2%$216.06
0
2026-Q1
Decreased
1.7M
-1.2%
$311.7M0.3%$183.33
0
2025-Q4
New
1.7M
-
$302.8M0.3%$175.99
51
2022-Q1
Exited
0
-100.0%
$00.0%$210.60
0
2021-Q4
Decreased
313,782
-5.7%
$75.3M0.1%$239.92
0
2021-Q3
Increased
332,589
+3.6%
$94.1M0.1%$282.99
37
2021-Q2
Increased
321,083
+4.9%
$111.2M0.1%$346.27
38
2021-Q1
Increased
306,036
+4.5%
$85.6M0.1%$279.75
37
2020-Q4
Increased
292,815
+0.3%
$71.7M0.1%$244.86
35
2020-Q3
Decreased
291,865
-4.2%
$82.8M0.2%$283.68
0
2020-Q2
Decreased
304,774
-10.2%
$81.5M0.1%$267.55
0
2020-Q1
Decreased
339,414
-75.8%
$107.3M0.2%$316.38
0
2019-Q4
Decreased
1.4M
-7.3%
$415.8M0.5%$296.73
0
2019-Q3
Decreased
1.5M
-3.7%
$352.9M0.5%$232.82
0
2019-Q2
Increased
1.6M
+70.1%
$367.1M0.5%$233.87
55
2019-Q1
Increased
922,718
+424.3%
$218.1M0.3%$236.38
59
2018-Q4
First report
176,007
-
$53M0.1%$300.92
0

Other major holders of BIIB: PRIMECAP MANAGEMENT CO/CA/

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