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MASSACHUSETTS FINANCIAL SERVICES CO /MA/

Position in BIIB — Biogen Inc.

CIK 912938 Boston, MA

Position in BIIB

as of Jun 30, 2026 · filed Aug 3, 2026
Position Value
$160,941,363
+$28,828,452 QoQ
Shares Held
744,892
+3.4% QoQ
Ownership
0.505%
of shares outstanding
% of Portfolio
0.06%
of 13F equity value
Holder Rank
#33
of 1,036 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 80% Shared 16% None 4%

Common Shares in BIIB Over Time

Shares Held

Position Value (USD)

Position in Drug Manufacturers - General

Healthcare · as of Jun 30, 2026

MASSACHUSETTS FINANCIAL SERVICES CO /MA/ holds $6,486,971,678 across 12 Drug Manufacturers - General names. BIIB ranks #6 (2.5% of the industry book) .

# Ticker Company Shares Value (USD) Open
6 BIIB
Biogen Inc.
This page
744,892 $160,941,363

All Filings in BIIB

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26 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $160,941,363 744,892
2026-03-31 $132,112,911 720,629
2025-12-31 $125,403,256 712,559
2025-09-30 $102,162,580 729,316
2025-06-30 $90,127,274 717,631
2025-03-31 $96,939,506 708,415
2024-12-31 $111,994,935 732,376
2024-09-30 $137,855,904 711,184
2024-06-30 $127,193,372 548,673
2024-03-31 $123,981,855 574,975
2023-12-31 $150,103,418 580,065
2023-09-30 $114,781,177 446,602
2023-06-30 $41,735,079 146,516
2023-03-31 $40,894,595 147,087
2022-12-31 $40,859,266 147,549
2022-09-30 $60,881,340 228,020
2022-06-30 $35,114,999 172,183
2022-03-31 $43,290,091 205,556
2021-12-31 $50,273,555 209,543
2021-09-30 $57,724,863 203,982
2021-06-30 $34,285,230 99,013
2021-03-31 $9,919,095 35,457
2020-12-31 $17,079,473 69,752
2020-09-30 $34,566,406 121,850
2020-06-30 $49,814,596 186,188
2020-03-31 $70,291,406 222,174