Robeco Institutional Asset Management
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Robeco Institutional Asset Management’s Biogen BIIB Stock Holding History

Robeco Institutional Asset Management’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 		$140M Buy
763,174
+152,266
+25% +$28.1M 0.2% 135
2025
Q4 		$108M Sell
610,908
-60,146
-9% -$9.83M 0.15% 158
2025
Q3 		$94M Buy
671,054
+222,297
+50% +$30M 0.14% 162
2025
Q2 		$56.4M Sell
448,757
-4,772
-1% -$595K 0.09% 213
2025
Q1 		$62.1M Buy
453,529
+45,253
+11% +$6.47M 0.12% 167
2024
Q4 		$62.4M Buy
408,276
+133,568
+49% +$22.5M 0.12% 169
2024
Q3 		$53.2M Buy
274,708
+59,771
+28% +$12.5M 0.11% 188
2024
Q2 		$49.8M Sell
214,937
-16,579
-7% -$3.6M 0.11% 183
2024
Q1 		$49.9M Sell
231,516
-62,024
-21% -$14.5M 0.11% 191
2023
Q4 		$76M Sell
293,540
-48,270
-14% -$11.9M 0.18% 127
2023
Q3 		$87.8M Sell
341,810
-1,407
-0.4% -$376K 0.23% 104
2023
Q2 		$97.8M Sell
343,217
-18,230
-5% -$5.43M 0.26% 95
2023
Q1 		$100M Buy
361,447
+48,290
+15% +$13.4M 0.27% 97
2022
Q4 		$86.7M Buy
313,157
+5,341
+2% +$1.51M 0.25% 101
2022
Q3 		$82.2M Buy
307,816
+126,305
+70% +$26.8M 0.27% 93
2022
Q2 		$37M Buy
181,511
+3,915
+2% +$800K 0.12% 177
2022
Q1 		$37.4M Sell
177,596
-13,669
-7% -$2.97M 0.09% 229
2021
Q4 		$45.9M Buy
191,265
+19,104
+11% +$4.91M 0.1% 224
2021
Q3 		$48.7M Buy
172,161
+7,716
+5% +$2.53M 0.11% 217
2021
Q2 		$56.9M Sell
164,445
-111,144
-40% -$33.7M 0.13% 193
2021
Q1 		$77.1M Sell
275,589
-48,910
-15% -$13.2M 0.19% 133
2020
Q4 		$79.5M Sell
324,499
-238,567
-42% -$61.5M 0.21% 121
2020
Q3 		$160M Buy
563,066
+160,408
+40% +$44.7M 0.49% 46
2020
Q2 		$108M Buy
402,658
+143,210
+55% +$43M 0.37% 67
2020
Q1 		$82.1M Buy
259,448
+39,407
+18% +$12M 0.33% 71
2019
Q4 		$65.3M Sell
220,041
-17,314
-7% -$4.8M 0.21% 132
2019
Q3 		$55.3M Sell
237,355
-66,076
-22% -$15.4M 0.2% 143
2019
Q2 		$71M Sell
303,431
-148,226
-33% -$34.2M 0.25% 107
2019
Q1 		$107M Buy
451,657
+76,630
+20% +$24.1M 0.39% 54
2018
Q4 		$113M Buy
375,027
+10,511
+3% +$3.35M 0.51% 42
2018
Q3 		$129M Sell
364,516
-52,645
-13% -$18.1M 0.51% 44
2018
Q2 		$121M Sell
417,161
-13,677
-3% -$3.85M 0.55% 39
2018
Q1 		$118M Buy
430,838
+139,562
+48% +$43.3M 0.55% 37
2017
Q4 		$92.8M Buy
291,276
+139,529
+92% +$44.8M 0.48% 52
2017
Q3 		$47.5M Buy
151,747
+116
+0.1% +$34.3K 0.3% 99
2017
Q2 		$41.1M Sell
151,631
-4,072
-3% -$1.08M 0.27% 107
2017
Q1 		$42.6M Buy
155,703
+11,670
+8% +$3.3M 0.28% 105
2016
Q4 		$40.8M Sell
144,033
-71,763
-33% -$21.3M 0.32% 99
2016
Q3 		$67.6M Sell
215,796
-25,155
-10% -$7.45M 0.5% 54
2016
Q2 		$58.3M Buy
240,951
+6,570
+3% +$1.73M 0.44% 69
2016
Q1 		$61M Buy
234,381
+45,185
+24% +$11.9M 0.49% 61
2015
Q4 		$58M Buy
189,196
+32,468
+21% +$9.33M 0.5% 58
2015
Q3 		$45.7M Sell
156,728
-1,109
-0.7% -$366K 0.35% 95
2015
Q2 		$63.8M Sell
157,837
-11,668
-7% -$4.68M 0.48% 47
2015
Q1 		$71.6M Buy
169,505
+153,822
+981% +$60.6M 0.54% 43
2014
Q4 		$5.32M Buy
15,683
+2,908
+23% +$941K 0.04% 334
2014
Q3 		$4.23M Buy
12,775
+2,187
+21% +$721K 0.03% 342
2014
Q2 		$3.34M Buy
10,588
+2,364
+29% +$712K 0.02% 364
2014
Q1 		$2.52M Sell
8,224
-34,055
-81% -$10.8M 0.02% 384
2013
Q4 		$11.8M Buy
42,279
+161
+0.4% +$41.6K 0.1% 210
2013
Q3 		$10.1M Sell
42,118
-1,124
-3% -$252K 0.1% 196
2013
Q2 		$9.3M Buy
+43,242
New +$9.24M 0.09% 200

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

Robeco Institutional Asset Management's BIIB Position: Q1 2026 in Review

Robeco Institutional Asset Management increased its Biogen (BIIB) stake by 25% in Q1 2026, buying an estimated $28.1M and bringing the position to 763,174 shares worth $140M. The position accounts for 0.2% of the portfolio, ranked #135.

Robeco Institutional Asset Management first reported a position in BIIB in Q2 2013 and has held it in 52 quarters since. The position peaked at $160M in Q3 2020. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Robeco Institutional Asset Management held 763,174 shares of Biogen worth $140M as of Q1 2026.
  • Robeco Institutional Asset Management bought 152,266 Biogen shares in Q1 2026, an estimated $28.1M.
  • Biogen made up 0.2% of Robeco Institutional Asset Management's portfolio in Q1 2026, its #135 holding.
  • Robeco Institutional Asset Management first reported a position in Biogen in Q2 2013 and has held it in 52 quarters since.
  • Robeco Institutional Asset Management's Biogen position peaked at $160M in Q3 2020.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Robeco Institutional Asset Management's 13F filing for Q1 2026, filed 21 Apr 2026.