- Quarter end
- 31 Dec 2023
- the date the book describes
- Filed
- 16 Feb 2024
- latest of these filings; the earliest 14 Feb 2024
- Managers listing it
- 8
- at least, of 95 tracked, among listed positions
- Comparable managers
- 93
- filed both Q3 2023 and Q4 2023; 5 listed it in both
- Shares listed
- 17,386,624
- combined, among listed positions
- Reported value
- $539m
- combined, at the quarter end
Among the 93 comparable managers: 4 buyers (opened or added shares) and 5 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.
Managers listing INSM in Q4 2023
8 of 8 holders
| Action | Filing | |||||
|---|---|---|---|---|---|---|
| T. Rowe Price Associates Inc | 10,763,771 | $334m | under 0.1% | Added | +356,555 | 16 Feb 2024 (the filing on sec.gov) |
| Holocene Advisors LP | 1,614,862 | $50m | 0.20% | Trimmed | -193,626 | 14 Feb 2024 (the filing on sec.gov) |
| Marshall Wace LLP | 1,439,769 | $45m | 0.08% | Added | n.a. | 14 Feb 2024 (the filing on sec.gov) |
| Janus Henderson Group Ltd | 1,403,091 | $43m | under 0.1% | Trimmed | -511,711 | 14 Feb 2024 (the filing on sec.gov) |
| Balyasny Asset Management LLC | 943,431 | $29m | 0.05% | Added | n.a. | 14 Feb 2024 (the filing on sec.gov) |
| Two Sigma Advisers LP | 629,200 | $19m | under 0.1% | Trimmed | -196,200 | 14 Feb 2024 (the filing on sec.gov) |
| Hudson Bay Capital Management LP | 467,500 | $14m | 0.09% | Trimmed | -380,000 | 14 Feb 2024 (the filing on sec.gov) |
| Soros Fund Management LLC | 125,000 | $3.9m | 0.05% | New | new | 14 Feb 2024 (the filing on sec.gov) |
Largest increases and reductions, by shares
Increases
- T. Rowe Price Associates Incexisting position · 10,763,771 shares now+356,555
- Soros Fund Management LLCnew position · 125,000 shares now+125,000
Reductions
- Janus Henderson Group Ltdexisting position · 1,403,091 shares now-511,711
- Hudson Bay Capital Management LPexisting position · 467,500 shares now-380,000
- Two Sigma Advisers LPexisting position · 629,200 shares now-196,200
- Holocene Advisors LPexisting position · 1,614,862 shares now-193,626
New positions and exits
New (1)
Exited (1)
- Moore Capital Management LPwas $1.3m
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q3 2013 | 1 | $20m | n.a. | n.a. |
| Q4 2013 | 1 | $28m | n.a. | n.a. |
| Q1 2014 | 2 | $39m | n.a. | n.a. |
| Q2 2014 | 2 | $43m | n.a. | n.a. |
| Q3 2014 | 1 | $34m | n.a. | n.a. |
| Q4 2014 | 1 | $44m | n.a. | n.a. |
| Q1 2015 | 1 | $174m | n.a. | n.a. |
| Q2 2015 | 1 | $211m | n.a. | n.a. |
| Q3 2015 | 1 | $168m | n.a. | n.a. |
| Q4 2015 | 2 | $169m | n.a. | n.a. |
| Q3 2016 | 1 | $146m | n.a. | n.a. |
| Q1 2017 | 1 | $189m | n.a. | n.a. |
| Q2 2017 | 4 | $180m | n.a. | n.a. |
| Q3 2017 | 7 | $890m | n.a. | n.a. |
| Q4 2017 | 4 | $954m | n.a. | n.a. |
| Q1 2018 | 3 | $428m | n.a. | n.a. |
| Q2 2018 | 3 | $475m | n.a. | n.a. |
| Q3 2018 | 4 | $416m | n.a. | n.a. |
| Q4 2018 | 1 | $150m | n.a. | n.a. |
| Q1 2019 | 4 | $897m | n.a. | n.a. |
| Q2 2019 | 6 | $559m | n.a. | n.a. |
| Q3 2019 | 6 | $284m | n.a. | n.a. |
| Q4 2019 | 6 | $680m | n.a. | n.a. |
| Q1 2020 | 7 | $472m | n.a. | n.a. |
| Q2 2020 | 7 | $1.0bn | n.a. | n.a. |
| Q3 2020 | 9 | $1.2bn | n.a. | n.a. |
| Q4 2020 | 8 | $1.0bn | n.a. | n.a. |
| Q1 2021 | 6 | $816m | n.a. | n.a. |
| Q2 2021 | 6 | $800m | n.a. | n.a. |
| Q3 2021 | 7 | $803m | n.a. | n.a. |
| Q4 2021 | 7 | $760m | n.a. | n.a. |
| Q1 2022 | 8 | $680m | n.a. | n.a. |
| Q2 2022 | 7 | $566m | n.a. | n.a. |
| Q3 2022 | 10 | $379m | n.a. | n.a. |
| Q4 2022 | 8 | $360m | n.a. | n.a. |
| Q1 2023 | 6 | $282m | n.a. | n.a. |
| Q2 2023 | 6 | $353m | n.a. | n.a. |
| Q3 2023 | 7 | $415m | n.a. | n.a. |
| Q4 2023 | 8 | $539m | 4 | 5 |
| Q1 2024 | 8 | $437m | 7 | 3 |
| Q2 2024 | 16 | $2.2bn | 10 | 6 |
| Q3 2024 | 18 | $2.3bn | 10 | 10 |
| Q4 2024 | 14 | $1.6bn | 4 | 8 |
| Q1 2025 | 14 | $1.9bn | 9 | 4 |
| Q2 2025 | 23 | $3.7bn | 17 | 6 |
| Q3 2025 | 20 | $5.8bn | 10 | 9 |
| Q4 2025 | 19 | $6.6bn | 14 | 20 |
| Q1 2026 | 19 | $7.0bn | 16 | 17 |
| Q2 2026 | 21 | $5.0bn | 28 | 11 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
INSM and LLY →INSM and JNJ →INSM and VRTX →Choose a stock to compare with INSM →
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own INSM, latest filings →Back to the 13F Explorer →