William Blair Investment Management, LLC / IM8N
William Blair Investment Management, LLC’s Insmed Inc Position
Does William Blair Investment Management, LLC own Insmed Inc (IM8N)? Yes — 902.7K shares worth $148M (+0.49% of its 13F portfolio) as of Q1 2026, down from 1.22M shares the prior filed quarter.
Position Value
$148M
Q1 2026
Shares
902.7K
% of Portfolio
+0.49%
Quarters Held
25
currently held
Position History IM8N
Reported value by quarter
| Quarter | Shares | Value | % of Portfolio |
|---|---|---|---|
| Q1 2026 | 902.7K | $148M | +0.49% |
| Q4 2025 | 1.22M | $213M | +0.59% |
| Q3 2025 | 1.56M | $224M | +0.58% |
| Q2 2025 | 1.67M | $168M | +0.44% |
| Q1 2025 | 2.31M | $176M | +0.50% |
| Q4 2024 | 2.43M | $168M | +0.41% |
| Q3 2024 | 2.42M | $177M | +0.44% |
| Q2 2024 | 3.47M | $232M | +0.61% |
| Q1 2024 | 4.21M | $114M | +0.30% |
| Q4 2023 | 4.26M | $132M | +0.38% |
| Q3 2023 | 4.24M | $107M | +0.36% |
| Q2 2023 | 4.29M | $90M | +0.29% |
| Q1 2023 | 3.71M | $63M | +0.22% |
| Q4 2022 | 3.39M | $68M | +0.26% |
| Q3 2022 | 3.56M | $77M | +0.30% |
| Q2 2022 | 3.53M | $70M | +0.26% |
| Q1 2022 | 3.60M | $84M | +0.25% |
| Q4 2021 | 4.91M | $134M | +0.36% |
| Q3 2021 | 4.98M | $137M | +0.39% |
| Q2 2021 | 5.03M | $143M | +0.45% |
| Q1 2021 | 3.76M | $128M | +0.42% |
| Q4 2020 | 3.70M | $123M | +0.41% |
| Q3 2020 | 2.39M | $77M | +0.30% |
| Q2 2020 | 819.4K | $23M | +0.09% |
| Q1 2020 | 715.6K | $11M | +0.06% |
Common-stock position only; options are excluded. Quarters where the fund filed no 13F or reported no position are absent. See William Blair Investment Management, LLC’s full portfolio or all institutional holders of IM8N.