Parallax Volatility Advisers’s Biogen BIIB Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q2 | $495K | Buy |
2,291
+602
| +36% | +$115K | ﹤0.01% | 1116 |
|
|
2026
Q1 | $314K | Sell |
1,689
-548
| -24% | -$101K | ﹤0.01% | 1119 |
|
|
2025
Q4 | $394K | Buy |
+2,237
| New | +$365K | ﹤0.01% | 1269 |
|
|
2025
Q1 | – | Sell |
-13,690
| Closed | -$2.09M | – | 1597 |
|
|
2024
Q4 | $2.09M | Sell |
13,690
-698
| -5% | -$118K | ﹤0.01% | 1119 |
|
|
2024
Q3 | $2.79M | Buy |
14,388
+122
| +0.9% | +$25.5K | 0.01% | 1012 |
|
|
2024
Q2 | $3.31M | Buy |
+14,266
| New | +$3.1M | 0.01% | 853 |
|
|
2023
Q4 | – | Sell |
-24,775
| Closed | -$6.37M | – | 2182 |
|
|
2023
Q3 | $6.37M | Buy |
24,775
+9,864
| +66% | +$2.64M | 0.01% | 679 |
|
|
2023
Q2 | $4.25M | Buy |
+14,911
| New | +$4.44M | 0.01% | 851 |
|
|
2022
Q2 | – | Sell |
-22,926
| Closed | -$4.69M | – | 2885 |
|
|
2022
Q1 | $4.83M | Buy |
+22,926
| New | +$4.99M | ﹤0.01% | 998 |
|
|
2020
Q4 | – | Sell |
-15,584
| Closed | -$4.42M | – | 2445 |
|
|
2020
Q3 | $4.42M | Sell |
15,584
-3,062
| -16% | -$854K | ﹤0.01% | 1376 |
|
|
2020
Q2 | $4.99M | Buy |
18,646
+11,239
| +152% | +$3.38M | 0.01% | 1080 |
|
|
2020
Q1 | $2.34M | Buy |
7,407
+5,389
| +267% | +$1.64M | ﹤0.01% | 1165 |
|
|
2019
Q4 | $599K | Sell |
2,018
-23,259
| -92% | -$6.45M | ﹤0.01% | 1677 |
|
|
2019
Q3 | $5.88M | Buy |
25,277
+23,747
| +1,552% | +$5.53M | 0.01% | 756 |
|
|
2019
Q2 | $358K | Sell |
1,530
-1,210
| -44% | -$279K | ﹤0.01% | 1591 |
|
|
2019
Q1 | $648K | Sell |
2,740
-11,582
| -81% | -$3.65M | ﹤0.01% | 1428 |
|
|
2018
Q4 | $4.31M | Buy |
14,322
+5,122
| +56% | +$1.63M | 0.01% | 760 |
|
|
2018
Q3 | $3.25M | Buy |
9,200
+6,088
| +196% | +$2.1M | ﹤0.01% | 869 |
|
|
2018
Q2 | $903K | Sell |
3,112
-4,351
| -58% | -$1.22M | ﹤0.01% | 1122 |
|
|
2018
Q1 | $2.04M | Sell |
7,463
-6,277
| -46% | -$1.95M | ﹤0.01% | 768 |
|
|
2017
Q4 | $4.38M | Buy |
13,740
+6,680
| +95% | +$2.14M | 0.01% | 650 |
|
|
2017
Q3 | $2.21M | Sell |
7,060
-9,532
| -57% | -$2.82M | ﹤0.01% | 817 |
|
|
2017
Q2 | $4.5M | Sell |
16,592
-10,317
| -38% | -$2.73M | 0.01% | 591 |
|
|
2017
Q1 | $7.36M | Sell |
26,909
-3,456
| -11% | -$977K | 0.02% | 459 |
|
|
2016
Q4 | $8.61M | Buy |
+30,365
| New | +$9M | 0.02% | 486 |
|
|
2016
Q2 | – | Sell |
-5,154
| Closed | -$1.36M | – | 2516 |
|
|
2016
Q1 | $1.34M | Buy |
+5,154
| New | +$1.36M | ﹤0.01% | 1065 |
|
|
2015
Q4 | – | Sell |
-7,613
| Closed | -$2.19M | – | 2872 |
|
|
2015
Q3 | $2.22M | Buy |
+7,613
| New | +$2.51M | ﹤0.01% | 960 |
|
|
2015
Q2 | – | Sell |
-47,089
| Closed | -$19.9M | – | 3616 |
|
|
2015
Q1 | $19.9M | Buy |
47,089
+41,909
| +809% | +$16.5M | 0.05% | 314 |
|
|
2014
Q4 | $1.76M | Buy |
5,180
+4,636
| +852% | +$1.5M | 0.01% | 1147 |
|
|
2014
Q3 | $180K | Buy |
544
+507
| +1,370% | +$167K | ﹤0.01% | 2537 |
|
|
2014
Q2 | $12K | Sell |
37
-28,115
| -100% | -$8.46M | ﹤0.01% | 3682 |
|
|
2014
Q1 | $8.61M | Buy |
28,152
+14,414
| +105% | +$4.58M | 0.05% | 278 |
|
|
2013
Q4 | $3.84M | Buy |
+13,738
| New | +$3.55M | 0.02% | 500 |
|
Other funds holding BIIB
Parallax Volatility Advisers's BIIB Position: Q2 2026 in Review
Parallax Volatility Advisers increased its Biogen (BIIB) stake by 36% in Q2 2026, buying an estimated $115K and bringing the position to 2,291 shares worth $495K. The position accounts for ﹤0.01% of the portfolio, ranked #1116.
Parallax Volatility Advisers first reported a position in BIIB in Q4 2013 and has held it in 33 quarters since. The position peaked at $19.9M in Q1 2015. 1,038 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.
- Parallax Volatility Advisers held 2,291 shares of Biogen worth $495K as of Q2 2026.
- Parallax Volatility Advisers bought 602 Biogen shares in Q2 2026, an estimated $115K.
- Biogen made up ﹤0.01% of Parallax Volatility Advisers's portfolio in Q2 2026, its #1116 holding.
- Parallax Volatility Advisers first reported a position in Biogen in Q4 2013 and has held it in 33 quarters since.
- Parallax Volatility Advisers's Biogen position peaked at $19.9M in Q1 2015.
- 1,038 funds tracked by Wall St. Rank held Biogen as of Q2 2026.
Based on Parallax Volatility Advisers's 13F filing for Q2 2026, filed 14 Aug 2026.