SEI Investments’s Biogen BIIB Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q1 | $13.1M | Buy |
71,513
+12,017
| +20% | +$2.21M | 0.01% | 989 |
|
|
2025
Q4 | $10.5M | Buy |
59,496
+36,665
| +161% | +$5.99M | 0.01% | 1040 |
|
|
2025
Q3 | $3.2M | Buy |
22,831
+803
| +4% | +$109K | ﹤0.01% | 1493 |
|
|
2025
Q2 | $2.77M | Buy |
22,028
+3,713
| +20% | +$463K | ﹤0.01% | 1518 |
|
|
2025
Q1 | $2.51M | Sell |
18,315
-14,379
| -44% | -$2.06M | ﹤0.01% | 1552 |
|
|
2024
Q4 | $5M | Sell |
32,694
-75,258
| -70% | -$12.7M | 0.01% | 1289 |
|
|
2024
Q3 | $20.9M | Buy |
107,952
+2,601
| +2% | +$544K | 0.03% | 642 |
|
|
2024
Q2 | $24.4M | Buy |
105,351
+14,900
| +16% | +$3.24M | 0.03% | 519 |
|
|
2024
Q1 | $19.5M | Buy |
90,451
+837
| +0.9% | +$196K | 0.03% | 611 |
|
|
2023
Q4 | $23.2M | Sell |
89,614
-2,182
| -2% | -$536K | 0.04% | 504 |
|
|
2023
Q3 | $23.6M | Buy |
91,796
+535
| +0.6% | +$143K | 0.04% | 472 |
|
|
2023
Q2 | $26M | Sell |
91,261
-10,154
| -10% | -$3.02M | 0.05% | 455 |
|
|
2023
Q1 | $28.2M | Buy |
101,415
+3,983
| +4% | +$1.1M | 0.05% | 403 |
|
|
2022
Q4 | $27M | Sell |
97,432
-6,426
| -6% | -$1.81M | 0.06% | 366 |
|
|
2022
Q3 | $27.7M | Sell |
103,858
-7,264
| -7% | -$1.54M | 0.06% | 352 |
|
|
2022
Q2 | $22.6M | Sell |
111,122
-110,221
| -50% | -$22.5M | 0.05% | 421 |
|
|
2022
Q1 | $46.6M | Sell |
221,343
-32,617
| -13% | -$7.09M | 0.09% | 216 |
|
|
2021
Q4 | $60.8M | Buy |
253,960
+44,012
| +21% | +$11.3M | 0.11% | 187 |
|
|
2021
Q3 | $59.5M | Buy |
209,948
+126,096
| +150% | +$41.3M | 0.12% | 167 |
|
|
2021
Q2 | $29M | Sell |
83,852
-16,469
| -16% | -$4.99M | 0.06% | 297 |
|
|
2021
Q1 | $27.1M | Buy |
100,321
+1,161
| +1% | +$313K | 0.07% | 293 |
|
|
2020
Q4 | $24.3M | Sell |
99,160
-24,230
| -20% | -$6.25M | 0.06% | 312 |
|
|
2020
Q3 | $35M | Sell |
123,390
-1,930
| -2% | -$538K | 0.1% | 178 |
|
|
2020
Q2 | $33.6M | Sell |
125,320
-791
| -0.6% | -$238K | 0.1% | 177 |
|
|
2020
Q1 | $39.9M | Sell |
126,111
-541
| -0.4% | -$164K | 0.15% | 120 |
|
|
2019
Q4 | $37.6M | Buy |
126,652
+8,462
| +7% | +$2.35M | 0.11% | 165 |
|
|
2019
Q3 | $27.3M | Buy |
118,190
+11,886
| +11% | +$2.77M | 0.07% | 256 |
|
|
2019
Q2 | $24.7M | Sell |
106,304
-10,827
| -9% | -$2.5M | 0.08% | 253 |
|
|
2019
Q1 | $27.5M | Sell |
117,131
-16,545
| -12% | -$5.21M | 0.09% | 217 |
|
|
2018
Q4 | $46.4M | Buy |
133,676
+5,394
| +4% | +$1.72M | 0.17% | 115 |
|
|
2018
Q3 | $45.3M | Sell |
128,282
-41,324
| -24% | -$14.2M | 0.16% | 107 |
|
|
2018
Q2 | $49.2M | Buy |
169,606
+9,327
| +6% | +$2.62M | 0.17% | 105 |
|
|
2018
Q1 | $43.9M | Sell |
160,279
-172,152
| -52% | -$53.4M | 0.17% | 125 |
|
|
2017
Q4 | $106M | Buy |
332,431
+9,809
| +3% | +$3.15M | 0.37% | 45 |
|
|
2017
Q3 | $101M | Buy |
322,622
+5,885
| +2% | +$1.74M | 0.36% | 51 |
|
|
2017
Q2 | $85.9M | Sell |
316,737
-50,369
| -14% | -$13.3M | 0.34% | 53 |
|
|
2017
Q1 | $100M | Buy |
367,106
+75,587
| +26% | +$21.4M | 0.44% | 30 |
|
|
2016
Q4 | $82.7M | Sell |
291,519
-37,329
| -11% | -$11.1M | 0.4% | 35 |
|
|
2016
Q3 | $103M | Buy |
328,848
+215,294
| +190% | +$63.8M | 0.52% | 23 |
|
|
2016
Q2 | $27.5M | Sell |
113,554
-14,805
| -12% | -$3.9M | 0.16% | 152 |
|
|
2016
Q1 | $33.4M | Buy |
128,359
+2,223
| +2% | +$587K | 0.21% | 120 |
|
|
2015
Q4 | $38.6M | Buy |
126,136
+31,366
| +33% | +$9.01M | 0.24% | 96 |
|
|
2015
Q3 | $27.7M | Sell |
94,770
-102,471
| -52% | -$33.8M | 0.25% | 93 |
|
|
2015
Q2 | $79.7M | Sell |
197,241
-66,825
| -25% | -$26.8M | 0.72% | 13 |
|
|
2015
Q1 | $111M | Sell |
264,066
-70,754
| -21% | -$27.9M | 0.97% | 10 |
|
|
2014
Q4 | $114M | Buy |
+334,820
| New | +$108M | 1% | 10 |
|
Other funds holding BIIB
VCM
VPM
SEI Investments's BIIB Position: Q1 2026 in Review
SEI Investments increased its Biogen (BIIB) stake by 20% in Q1 2026, buying an estimated $2.21M and bringing the position to 71,513 shares worth $13.1M. The position accounts for 0.01% of the portfolio, ranked #989.
SEI Investments first reported a position in BIIB in Q4 2014 and has held it in 46 quarters since. The position peaked at $114M in Q4 2014. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.
- SEI Investments held 71,513 shares of Biogen worth $13.1M as of Q1 2026.
- SEI Investments bought 12,017 Biogen shares in Q1 2026, an estimated $2.21M.
- Biogen made up 0.01% of SEI Investments's portfolio in Q1 2026, its #989 holding.
- SEI Investments first reported a position in Biogen in Q4 2014 and has held it in 46 quarters since.
- SEI Investments's Biogen position peaked at $114M in Q4 2014.
- 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.
Based on SEI Investments's 13F filing for Q1 2026, filed 13 May 2026.