Thompson Siegel & Walmsley LLC / BIIB
Thompson Siegel & Walmsley LLC’s Biogen Inc Position
Does Thompson Siegel & Walmsley LLC own Biogen Inc (BIIB)? Yes — 248.3K shares worth $46M (+0.80% of its 13F portfolio) as of Q1 2026, up from 228.8K shares the prior filed quarter.
Position Value
$46M
Q1 2026
Shares
248.3K
% of Portfolio
+0.80%
Quarters Held
25
currently held
Position History BIIB
Reported value by quarter
| Quarter | Shares | Value | % of Portfolio |
|---|---|---|---|
| Q1 2026 | 248.3K | $46M | +0.80% |
| Q4 2025 | 228.8K | $40M | +0.68% |
| Q3 2025 | 306.4K | $43M | +0.69% |
| Q2 2025 | 323.0K | $41M | +0.67% |
| Q1 2025 | 257.5K | $35M | +0.59% |
| Q4 2023 | 393 | $102,000 | 0.00% |
| Q3 2023 | 393 | $101,000 | 0.00% |
| Q2 2023 | 393 | $112,000 | 0.00% |
| Q1 2023 | 441 | $123,000 | 0.00% |
| Q4 2022 | 441 | $122,000 | 0.00% |
| Q3 2022 | 441 | $118,000 | 0.00% |
| Q2 2022 | 441 | $90,000 | 0.00% |
| Q1 2022 | 441 | $93,000 | 0.00% |
| Q4 2021 | 441 | $106,000 | 0.00% |
| Q3 2021 | 446 | $126,000 | 0.00% |
| Q2 2021 | 446 | $154,000 | 0.00% |
| Q1 2021 | 461 | $129,000 | 0.00% |
| Q4 2020 | 523 | $128,000 | 0.00% |
| Q3 2020 | 15.7K | $4M | +0.09% |
| Q2 2020 | 17.5K | $5M | +0.09% |
| Q1 2020 | 14.8K | $5M | +0.11% |
| Q4 2019 | 408 | $121,000 | 0.00% |
| Q3 2019 | 396 | $92,000 | 0.00% |
| Q2 2019 | 396 | $93,000 | 0.00% |
| Q1 2019 | 396 | $94,000 | 0.00% |
Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See Thompson Siegel & Walmsley LLC’s full portfolio or all institutional holders of BIIB.