Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2026
Q1
$430K Hold
2,348
0.03% 429
2025
Q4
$413K Hold
2,348
0.03% 446
2025
Q3
$329K Sell
2,348
-29,316
-93% -$3.96M 0.02% 498
2025
Q2
$3.98M Buy
+31,664
New +$3.95M 0.22% 153
2025
Q1
Sell
-39,405
Closed -$6.03M 751
2024
Q4
$6.03M Buy
39,405
+22,908
+139% +$3.86M 0.53% 16
2024
Q3
$3.2M Buy
16,497
+9,997
+154% +$2.09M 0.28% 101
2024
Q2
$1.51M Buy
+6,500
New +$1.41M 0.14% 259
2024
Q1
Sell
-6,125
Closed -$1.58M 629
2023
Q4
$1.58M Buy
6,125
+4,525
+283% +$1.11M 0.18% 197
2023
Q3
$411K Buy
+1,600
New +$428K 0.05% 439
2023
Q2
Sell
-3,039
Closed -$845K 579
2023
Q1
$845K Buy
+3,039
New +$841K 0.11% 298
2022
Q4
Sell
-1,175
Closed -$314K 649
2022
Q3
$314K Buy
+1,175
New +$250K 0.05% 572
2022
Q2
Sell
-6,544
Closed -$1.38M 963
2022
Q1
$1.38M Buy
6,544
+4,097
+167% +$891K 0.12% 270
2021
Q4
$587K Buy
+2,447
New +$629K 0.04% 487
2020
Q4
Sell
-27,513
Closed -$7.8M 699
2020
Q3
$7.8M Sell
27,513
-2
-0% -$558 0.52% 41
2020
Q2
$7.36M Sell
27,515
-7,107
-21% -$2.14M 0.5% 66
2020
Q1
$11M Buy
34,622
+2,501
+8% +$759K 0.87% 8
2019
Q4
$9.53M Sell
32,121
-10,379
-24% -$2.88M 0.59% 45
2019
Q3
$9.89M Hold
42,500
0.59% 35
2019
Q2
$9.94M Buy
+42,500
New +$9.81M 0.59% 42
2018
Q3
Sell
-39,800
Closed -$11.6M 477
2018
Q2
$11.6M Hold
39,800
0.44% 68
2018
Q1
$10.9M Sell
39,800
-15,500
-28% -$4.81M 0.37% 85
2017
Q4
$17.6M Buy
55,300
+12,600
+30% +$4.04M 0.51% 64
2017
Q3
$13.4M Sell
42,700
-6,400
-13% -$1.9M 0.44% 75
2017
Q2
$13.3M Buy
49,100
+19,600
+66% +$5.18M 0.54% 45
2017
Q1
$8.07M Buy
29,500
+5,400
+22% +$1.53M 0.42% 79
2016
Q4
$6.83M Sell
24,100
-14,100
-37% -$4.18M 0.45% 46
2016
Q3
$12M Buy
38,200
+10,000
+35% +$2.96M 0.7% 5
2016
Q2
$6.82M Buy
+28,200
New +$7.43M 0.54% 75
2015
Q4
Sell
-57,546
Closed -$16.8M 458
2015
Q3
$16.8M Sell
57,546
-319
-0.6% -$105K 0.38% 59
2015
Q2
$23.4M Buy
57,865
+4,630
+9% +$1.86M 0.61% 21
2015
Q1
$22.5M Buy
53,235
+50,405
+1,781% +$19.9M 0.56% 20
2014
Q4
$961K Sell
2,830
-78,711
-97% -$25.5M 0.09% 311
2014
Q3
$27M Buy
81,541
+79,811
+4,613% +$26.3M 0.68% 16
2014
Q2
$545K Sell
1,730
-8,904
-84% -$2.68M 0.01% 953
2014
Q1
$3.25M Buy
10,634
+8,704
+451% +$2.76M 0.08% 314
2013
Q4
$540K Buy
1,930
+200
+12% +$51.7K 0.07% 392
2013
Q3
$417K Sell
1,730
-26,602
-94% -$5.95M 0.01% 1125
2013
Q2
$6.1M Buy
+28,332
New +$6.05M 0.15% 160

Other funds holding BIIB

PDT Partners's BIIB Position: Q1 2026 in Review

PDT Partners held its Biogen (BIIB) position steady in Q1 2026 at 2,348 shares worth $430K. The position accounts for 0.03% of the portfolio, ranked #429.

PDT Partners first reported a position in BIIB in Q2 2013 and has held it in 38 quarters since. The position peaked at $27M in Q3 2014. 1,004 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • PDT Partners held 2,348 shares of Biogen worth $430K as of Q1 2026.
  • PDT Partners left its Biogen share count unchanged in Q1 2026.
  • Biogen made up 0.03% of PDT Partners's portfolio in Q1 2026, its #429 holding.
  • PDT Partners first reported a position in Biogen in Q2 2013 and has held it in 38 quarters since.
  • PDT Partners's Biogen position peaked at $27M in Q3 2014.
  • 1,004 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on PDT Partners's 13F filing for Q1 2026, filed 15 May 2026.