SDIC
BIIB icon

South Dakota Investment Council’s Biogen BIIB Stock Holding History

South Dakota Investment Council’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 		$589K Hold
3,213
– – 0.01% 497
2025
Q4 		$565K Sell
3,213
-200
-6% -$32.7K 0.01% 485
2025
Q3 		$478K Sell
3,413
-200
-6% -$27K 0.01% 513
2025
Q2 		$454K Hold
3,613
– – 0.01% 529
2025
Q1 		$494K Hold
3,613
– – 0.01% 501
2024
Q4 		$552K Hold
3,613
– – 0.01% 491
2024
Q3 		$700K Hold
3,613
– – 0.01% 475
2024
Q2 		$838K Sell
3,613
-6
-0.2% -$1.3K 0.02% 438
2024
Q1 		$780K Hold
3,619
– – 0.02% 447
2023
Q4 		$936K Hold
3,619
– – 0.02% 470
2023
Q3 		$930K Sell
3,619
-200
-5% -$53.5K 0.02% 455
2023
Q2 		$1.09M Sell
3,819
-200
-5% -$59.5K 0.02% 452
2023
Q1 		$1.12M Hold
4,019
– – 0.02% 452
2022
Q4 		$1.11M Hold
4,019
– – 0.02% 441
2022
Q3 		$1.07M Hold
4,019
– – 0.03% 426
2022
Q2 		$820K Hold
4,019
– – 0.02% 467
2022
Q1 		$846K Sell
4,019
-3,020
-43% -$657K 0.02% 461
2021
Q4 		$1.69M Hold
7,039
– – 0.03% 393
2021
Q3 		$1.99M Buy
7,039
+400
+6% +$131K 0.04% 343
2021
Q2 		$2.3M Sell
6,639
-540
-8% -$164K 0.04% 319
2021
Q1 		$2.01M Sell
7,179
-10,500
-59% -$2.83M 0.03% 357
2020
Q4 		$4.33M Buy
17,679
+10,500
+146% +$2.71M 0.08% 213
2020
Q3 		$2.04M Sell
7,179
-1,070
-13% -$298K 0.04% 304
2020
Q2 		$2.21M Hold
8,249
– – 0.05% 280
2020
Q1 		$2.61M Sell
8,249
-11
-0.1% -$3.34K 0.07% 211
2019
Q4 		$2.45M Sell
8,260
-730
-8% -$203K 0.05% 285
2019
Q3 		$2.09M Sell
8,990
-1,185
-12% -$276K 0.04% 338
2019
Q2 		$2.38M Sell
10,175
-28,441
-74% -$6.57M 0.05% 282
2019
Q1 		$9.13M Sell
38,616
-25,270
-40% -$7.96M 0.19% 115
2018
Q4 		$19.2M Sell
63,886
-3,700
-5% -$1.18M 0.48% 58
2018
Q3 		$23.9M Sell
67,586
-1,225
-2% -$422K 0.52% 57
2018
Q2 		$20M Buy
68,811
+1,150
+2% +$323K 0.44% 69
2018
Q1 		$18.5M Buy
67,661
+22,266
+49% +$6.91M 0.42% 68
2017
Q4 		$14.5M Sell
45,395
-8,750
-16% -$2.81M 0.32% 79
2017
Q3 		$17M Sell
54,145
-10,810
-17% -$3.2M 0.34% 72
2017
Q2 		$17.6M Buy
64,955
+48,080
+285% +$12.7M 0.37% 69
2017
Q1 		$4.61M Sell
16,875
-1,900
-10% -$537K 0.09% 171
2016
Q4 		$5.32M Sell
18,775
-725
-4% -$215K 0.11% 152
2016
Q3 		$6.1M Hold
19,500
– – 0.13% 141
2016
Q2 		$4.71M Hold
19,500
– – 0.1% 161
2016
Q1 		$5.08M Buy
19,500
+2,050
+12% +$542K 0.11% 155
2015
Q4 		$5.35M Buy
17,450
+2,300
+15% +$661K 0.12% 143
2015
Q3 		$4.42M Buy
15,150
+100
+0.7% +$33K 0.1% 153
2015
Q2 		$6.08M Sell
15,050
-3,500
-19% -$1.4M 0.12% 130
2015
Q1 		$7.83M Buy
18,550
+1,550
+9% +$611K 0.15% 117
2014
Q4 		$5.77M Buy
17,000
+6,400
+60% +$2.07M 0.11% 137
2014
Q3 		$3.51M Buy
+10,600
New +$3.5M 0.07% 186

Other funds holding BIIB

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

South Dakota Investment Council's BIIB Position: Q1 2026 in Review

South Dakota Investment Council held its Biogen (BIIB) position steady in Q1 2026 at 3,213 shares worth $589K. The position accounts for 0.01% of the portfolio, ranked #497.

South Dakota Investment Council first reported a position in BIIB in Q3 2014 and has held it in 47 quarters since. The position peaked at $23.9M in Q3 2018. 1,005 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • South Dakota Investment Council held 3,213 shares of Biogen worth $589K as of Q1 2026.
  • South Dakota Investment Council left its Biogen share count unchanged in Q1 2026.
  • Biogen made up 0.01% of South Dakota Investment Council's portfolio in Q1 2026, its #497 holding.
  • South Dakota Investment Council first reported a position in Biogen in Q3 2014 and has held it in 47 quarters since.
  • South Dakota Investment Council's Biogen position peaked at $23.9M in Q3 2018.
  • 1,005 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on South Dakota Investment Council's 13F filing for Q1 2026, filed 18 May 2026.