Swiss National Bank’s Biogen BIIB Stock Holding History

Swiss National Bank’s Portfolio BIIB Stock Details BIIB Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$78.9M	Buy	430,600 +28,800	+7%	+$5.31M	0.05%	335
2025 Q4	$70.7M	Sell	401,800 -20,600	-5%	-$3.37M	0.04%	333
2025 Q3	$59.2M	Sell	422,400 -20,700	-5%	-$2.8M	0.03%	387
2025 Q2	$55.6M	Buy	443,100 +32,100	+8%	+$4M	0.03%	409
2025 Q1	$56.2M	Sell	411,000 -500	-0.1%	-$71.5K	0.04%	372
2024 Q4	$62.9M	Sell	411,500 -20,600	-5%	-$3.47M	0.04%	354
2024 Q3	$83.8M	Buy	432,100 +1,700	+0.4%	+$356K	0.05%	302
2024 Q2	$99.8M	Sell	430,400 -3,500	-0.8%	-$761K	0.07%	257
2024 Q1	$93.6M	Sell	433,900 -19,000	-4%	-$4.45M	0.07%	275
2023 Q4	$117M	Sell	452,900 -12,700	-3%	-$3.12M	0.09%	219
2023 Q3	$120M	Sell	465,600 -56,300	-11%	-$15.1M	0.09%	198
2023 Q2	$149M	Sell	521,900 -49,600	-9%	-$14.8M	0.1%	183
2023 Q1	$159M	Sell	571,500 -18,300	-3%	-$5.06M	0.11%	178
2022 Q4	$163M	Sell	589,800 -44,972	-7%	-$12.7M	0.12%	169
2022 Q3	$169M	Sell	634,772 -2,600	-0.4%	-$552K	0.12%	154
2022 Q2	$130M	Buy	637,372 +1,100	+0.2%	+$225K	0.09%	218
2022 Q1	$134M	Buy	636,272 +69,700	+12%	+$15.2M	0.08%	250
2021 Q4	$136M	Sell	566,572 -28,700	-5%	-$7.38M	0.08%	230
2021 Q3	$168M	Sell	595,272 -25,800	-4%	-$8.46M	0.11%	174
2021 Q2	$215M	Buy	621,072 +29,314	+5%	+$8.88M	0.13%	138
2021 Q1	$166M	Sell	591,758 -6,200	-1%	-$1.67M	0.11%	171
2020 Q4	$146M	Sell	597,958 -37,300	-6%	-$9.62M	0.1%	181
2020 Q3	$180M	Sell	635,258 -53,200	-8%	-$14.8M	0.14%	137
2020 Q2	$184M	Sell	688,458 -11,900	-2%	-$3.58M	0.16%	126
2020 Q1	$222M	Buy	700,358 +118,800	+20%	+$36.1M	0.24%	91
2019 Q4	$173M	Sell	581,558 -58,800	-9%	-$16.3M	0.18%	113
2019 Q3	$149M	Sell	640,358 -841	-0.1%	-$196K	0.16%	139
2019 Q2	$150M	Sell	641,199 -31,400	-5%	-$7.25M	0.16%	127
2019 Q1	$159M	Buy	672,599 +17,800	+3%	+$5.61M	0.17%	115
2018 Q4	$197M	Sell	654,799 -18,900	-3%	-$6.03M	0.25%	82
2018 Q3	$238M	Sell	673,699 -26,000	-4%	-$8.95M	0.27%	74
2018 Q2	$203M	Buy	699,699 +21,200	+3%	+$5.96M	0.23%	87
2018 Q1	$186M	Sell	678,499 -102,400	-13%	-$31.8M	0.23%	98
2017 Q4	$249M	Sell	780,899 -7,900	-1%	-$2.53M	0.27%	73
2017 Q3	$247M	Sell	788,799 -100	-0%	-$29.6K	0.28%	75
2017 Q2	$214M	Buy	788,899 +18,000	+2%	+$4.76M	0.25%	87
2017 Q1	$211M	Buy	770,899 +160,600	+26%	+$45.4M	0.26%	83
2016 Q4	$173M	Buy	610,299 +3,500	+0.6%	+$1.04M	0.27%	81
2016 Q3	$190M	Sell	606,799 -6,100	-1%	-$1.81M	0.3%	70
2016 Q2	$148M	Buy	612,899 +33,800	+6%	+$8.91M	0.24%	97
2016 Q1	$144M	Buy	579,099 +151,900	+36%	+$40.1M	0.27%	83
2015 Q4	$131M	Buy	427,199 +7,400	+2%	+$2.13M	0.32%	69
2015 Q3	$123M	Buy	419,799 +41,200	+11%	+$13.6M	0.31%	70
2015 Q2	$153M	Buy	378,599 +18,800	+5%	+$7.55M	0.4%	49
2015 Q1	$152M	Buy	359,799 +140,500	+64%	+$55.4M	0.41%	49
2014 Q4	$74.4M	Sell	219,299 -7,900	-3%	-$2.56M	0.28%	77
2014 Q3	$75.2M	Sell	227,199 -3,200	-1%	-$1.06M	0.29%	72
2014 Q2	$72.6M	Buy	230,399 +1,400	+0.6%	+$421K	0.27%	83
2014 Q1	$70M	Sell	228,999 -24,200	-10%	-$7.68M	0.27%	79
2013 Q4	$70.8M	Sell	253,199 -3,900	-2%	-$1.01M	0.28%	81
2013 Q3	$61.9M	Buy	257,099 +5,600	+2%	+$1.25M	0.26%	89
2013 Q2	$54.1M	Buy	+251,499	New	+$53.7M	0.24%	98

Other funds holding BIIB

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Swiss National Bank's BIIB Position: Q1 2026 in Review

Swiss National Bank increased its Biogen (BIIB) stake by 7.2% in Q1 2026, buying an estimated $5.31M and bringing the position to 430,600 shares worth $78.9M. The position accounts for 0.05% of the portfolio, ranked #335.

Swiss National Bank first reported a position in BIIB in Q2 2013 and has held it in 52 quarters since. The position peaked at $249M in Q4 2017. 1,008 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

Swiss National Bank held 430,600 shares of Biogen worth $78.9M as of Q1 2026.
Swiss National Bank bought 28,800 Biogen shares in Q1 2026, an estimated $5.31M.
Biogen made up 0.05% of Swiss National Bank's portfolio in Q1 2026, its #335 holding.
Swiss National Bank first reported a position in Biogen in Q2 2013 and has held it in 52 quarters since.
Swiss National Bank's Biogen position peaked at $249M in Q4 2017.
1,008 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Swiss National Bank's 13F filing for Q1 2026, filed 7 May 2026.