Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2026
Q1
$4.14M Sell
22,585
-6,519
-22% -$1.2M 0.01% 466
2025
Q4
$5.12M Buy
29,104
+5,068
+21% +$828K 0.02% 458
2025
Q3
$3.37M Sell
24,036
-10,745
-31% -$1.45M 0.02% 502
2025
Q2
$4.37M Buy
34,781
+4,876
+16% +$608K 0.02% 369
2025
Q1
$4.08M Buy
29,905
+1,513
+5% +$216K 0.02% 340
2024
Q4
$4.34M Sell
28,392
-88,057
-76% -$14.9M 0.03% 362
2024
Q3
$22.6M Buy
116,449
+8,968
+8% +$1.88M 0.13% 117
2024
Q2
$24.9M Buy
107,481
+5,743
+6% +$1.25M 0.14% 118
2024
Q1
$21.9M Buy
101,738
+34,665
+52% +$8.12M 0.11% 143
2023
Q4
$17.4M Buy
67,073
+45,538
+211% +$11.2M 0.13% 152
2023
Q3
$5.53M Sell
21,535
-10,402
-33% -$2.78M 0.04% 278
2023
Q2
$9.1M Buy
31,937
+15,668
+96% +$4.66M 0.07% 204
2023
Q1
$4.52M Sell
16,269
-128,995
-89% -$35.7M 0.04% 287
2022
Q4
$40.2M Buy
145,264
+53,173
+58% +$15M 0.23% 110
2022
Q3
$24.6M Sell
92,091
-44,500
-33% -$9.45M 0.12% 138
2022
Q2
$28M Buy
136,591
+43,324
+46% +$8.86M 0.1% 127
2022
Q1
$19.6M Sell
93,267
-122,407
-57% -$26.6M 0.07% 264
2021
Q4
$51.7M Buy
215,674
+127,089
+143% +$32.7M 0.18% 102
2021
Q3
$25.1M Sell
88,585
-18,719
-17% -$6.14M 0.09% 198
2021
Q2
$37.2M Buy
107,304
+63,990
+148% +$19.4M 0.16% 130
2021
Q1
$12.1M Sell
43,314
-43,223
-50% -$11.7M 0.04% 344
2020
Q4
$21.2M Buy
86,537
+69,604
+411% +$18M 0.08% 246
2020
Q3
$4.8M Sell
16,933
-15,542
-48% -$4.33M 0.04% 288
2020
Q2
$8.69M Sell
32,475
-40,786
-56% -$12.3M 0.07% 207
2020
Q1
$23.2M Sell
73,261
-110,302
-60% -$33.5M 0.18% 116
2019
Q4
$54.3M Buy
183,563
+23,753
+15% +$6.59M 0.34% 82
2019
Q3
$37.2M Buy
159,810
+17,170
+12% +$4M 0.24% 98
2019
Q2
$33.4M Sell
142,640
-129,334
-48% -$29.9M 0.26% 84
2019
Q1
$63.3M Buy
271,974
+236,794
+673% +$74.6M 0.4% 52
2018
Q4
$10.6M Sell
35,180
-61,881
-64% -$19.7M 0.09% 213
2018
Q3
$34.3M Sell
97,061
-43,684
-31% -$15M 0.2% 118
2018
Q2
$40.9M Buy
140,745
+9,687
+7% +$2.72M 0.22% 108
2018
Q1
$35.9M Buy
131,058
+32,188
+33% +$9.99M 0.22% 106
2017
Q4
$31.5M Buy
98,870
+26,826
+37% +$8.61M 0.24% 111
2017
Q3
$22.6M Sell
72,044
-149,194
-67% -$44.2M 0.21% 119
2017
Q2
$60M Buy
221,238
+19,762
+10% +$5.23M 0.68% 40
2017
Q1
$55.1M Buy
201,476
+14,130
+8% +$4M 0.69% 37
2016
Q4
$53.1M Buy
+187,346
New +$55.5M 0.55% 42
2016
Q3
Sell
-126,274
Closed -$30.5M 524
2016
Q2
$30.5M Buy
126,274
+914
+0.7% +$241K 0.57% 43
2016
Q1
$32.6M Sell
125,360
-24,675
-16% -$6.52M 0.55% 46
2015
Q4
$46M Buy
+150,035
New +$43.1M 0.77% 23
2015
Q3
Sell
-779
Closed -$315K 315
2015
Q2
$315K Sell
779
-30,544
-98% -$12.3M ﹤0.01% 302
2015
Q1
$13.2M Buy
+31,323
New +$12.3M 0.18% 81
2014
Q4
Sell
-3,133
Closed -$1.04M 386
2014
Q3
$1.04M Sell
3,133
-32,960
-91% -$10.9M 0.02% 255
2014
Q2
$11.4M Sell
36,093
-22,169
-38% -$6.67M 0.14% 132
2014
Q1
$17.8M Sell
58,262
-142,402
-71% -$45.2M 0.23% 100
2013
Q4
$56.1M Sell
200,664
-20,236
-9% -$5.23M 0.48% 46
2013
Q3
$53.2M Buy
220,900
+112,000
+103% +$25.1M 0.57% 47
2013
Q2
$23.4M Buy
+108,900
New +$23.3M 0.33% 74

Other funds holding BIIB

Natixis's BIIB Position: Q1 2026 in Review

Natixis reduced its Biogen (BIIB) stake by 22% in Q1 2026, selling an estimated $1.2M and leaving 22,585 shares worth $4.14M. The position accounts for 0.01% of the portfolio, ranked #466.

Natixis first reported a position in BIIB in Q2 2013 and has held it in 49 quarters since. The position peaked at $63.3M in Q1 2019. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

  • Natixis held 22,585 shares of Biogen worth $4.14M as of Q1 2026.
  • Natixis sold 6,519 Biogen shares in Q1 2026, an estimated $1.2M.
  • Biogen made up 0.01% of Natixis's portfolio in Q1 2026, its #466 holding.
  • Natixis first reported a position in Biogen in Q2 2013 and has held it in 49 quarters since.
  • Natixis's Biogen position peaked at $63.3M in Q1 2019.
  • 1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Natixis's 13F filing for Q1 2026, filed 14 May 2026.