MASSACHUSETTS FINANCIAL SERVICES CO /MA/

CIK

912938

City

Boston

State / Country

Stock

BIIB — Biogen Inc.

Top Portfolio Positions

920 positions · $278,888,369,724 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio
NVDA	Nvidia Corp Technology	65,275,558	$11,384,057,313	4.08%
MSFT	Microsoft Corp Technology	25,473,981	$9,429,703,542	3.38%
AAPL	Apple Inc. Technology	30,317,142	$7,694,187,464	2.76%
GOOGL	Alphabet Inc. Communication Services	23,413,232	$6,732,708,992	2.41%
AMZN	Amazon Com Inc Consumer Cyclical	25,952,500	$5,405,127,170	1.94%
JPM	Jpmorgan Chase & Co Financial Services	14,662,099	$4,313,003,038	1.55%
JNJ	Johnson & Johnson Healthcare	13,434,302	$3,283,880,778	1.18%
TSM	Taiwan Semiconductor Manufacturing Co Ltd Technology	9,677,855	$3,270,631,094	1.17%
CI	Cigna Group Healthcare	11,595,182	$3,093,014,794	1.11%
XOM	Exxon Mobil Corp Energy	17,922,157	$3,040,673,153	1.09%

52 quarters · across all stocks

Compact Export CSV

25 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$132,112,911	720,629	+1.1%	Shares	Defined	2026-05-14
2025-12-31	$125,403,256	712,559	-2.3%	Shares	Sole	2026-01-22
2025-09-30	$102,162,580	729,316	+1.6%	Shares	Sole	2025-10-29
2025-06-30	$90,127,274	717,631	+1.3%	Shares	Sole	2025-08-08
2025-03-31	$96,939,506	708,415	-3.3%	Shares	Sole	2025-05-02
2024-12-31	$111,994,935	732,376	+3.0%	Shares	Sole	2025-02-12
2024-09-30	$137,855,904	711,184	+29.6%	Shares	Sole	2024-11-12
2024-06-30	$127,193,372	548,673	-4.6%	Shares	Sole	2024-08-09
2024-03-31	$123,981,855	574,975	-0.9%	Shares	Sole	2024-05-14
2023-12-31	$150,103,418	580,065	+29.9%	Shares	Sole	2024-02-08
2023-09-30	$114,781,177	446,602	+204.8%	Shares	Sole	2023-11-08
2023-06-30	$41,735,079	146,516	-0.4%	Shares	Sole	2023-08-09
2023-03-31	$40,894,595	147,087	-0.3%	Shares	Sole	2023-05-10
2022-12-31	$40,859,266	147,549	-35.3%	Shares	Sole	2023-02-13
2022-09-30	$60,881,340	228,020	+32.4%	Shares	Sole	2022-11-09
2022-06-30	$35,114,999	172,183	-16.2%	Shares	Sole	2022-08-09
2022-03-31	$43,290,091	205,556	-1.9%	Shares	Sole	2022-05-11
2021-12-31	$50,273,555	209,543	+2.7%	Shares	Sole	2022-02-10
2021-09-30	$57,724,863	203,982	+106.0%	Shares	Sole	2021-11-10
2021-06-30	$34,285,230	99,013	+179.2%	Shares	Sole	2021-08-13
2021-03-31	$9,919,095	35,457	-49.2%	Shares	Sole	2021-05-13
2020-12-31	$17,079,473	69,752	-42.8%	Shares	Sole	2021-05-12
2020-09-30	$34,566,406	121,850	-34.6%	Shares	Sole	2020-11-12
2020-06-30	$49,814,596	186,188	-16.2%	Shares	Sole	2020-11-20
2020-03-31	$70,291,406	222,174	—	Shares	Sole	2020-11-20
No 13F history on record for this holder in this stock.