Which funds own INSM
Insmed Inc in the Q2 2026 filings. At least 6 of the 91 current managers on file reported a position, worth $1.9bn between them. It is among the largest positions of fewer than a fifth of the current managers on file. The quarter went one way: 5 managers opened or added against 2 cutting.
- Managers holding
- 6
- at least, of 91 current
- Combined value
- $1.9bn
- as reported
- Opened
- 1
- new this quarter
- Added to
- 4
- already held
- Trimmed or sold out
- 2
- 1 sold out entirely
Only each manager’s largest 200 positions are listed here, so a smaller holder may be missing.
Managers reporting a position
Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.
| Manager | Value | Weight | Shares | Change on the quarter | Action |
|---|---|---|---|---|---|
| D. E. Shaw & Co. Quantitative · $210bn book | $627m | 0.3% | 5,877,959 | -$293m+252,134 | Added |
| Artisan Partners LP Long-only · $63.1bn book | $580m | 0.9% | 5,441,718 | -$487m-1,085,583 | Trimmed |
| Janus Henderson Group Ltd Long-only · $245bn book | $278m | 0.1% | 2,605,181 | +$209m+2,185,877 | Added |
| Maverick Capital Ltd Long/short equity · $11.3bn book | $229m | 2.0% | 2,150,762 | opened2,150,762 | New |
| Balyasny Asset Management LLC Multi-strategy · $80.2bn book | $141m | 0.2% | 1,326,430 | +$105m+1,104,723 | Added |
| Bridgewater Associates LP Macro · $24.4bn book | $49m | 0.2% | 455,392 | +$200k+159,813 | Added |
Sold out of this quarter
Valued at what the position was worth in the previous filing, because by this one it is gone.
- Capital World Investors · Long-only$223m held before
Ownership through time
At least 21 of the 95 managers whose filings are on file listed INSM in Q2 2026, against 1 in Q3 2013. 2 managers more than in Q1 2026: 5 started positions; 2 listed it again; 1 sold out, by its own filing; 4 no longer listed it among the positions read, which can mean a holding below the listed range or a filing not yet made.
Each manager’s largest 500 positions a quarter are read, so a small holding in a very large book can be missing, and a manager is counted as leaving only where its own filing shows it.
- Q3 2013: 1
- Q4 2013: 1
- Q1 2014: 2
- Q2 2014: 2
- Q3 2014: 1
- Q4 2014: 1
- Q1 2015: 1
- Q2 2015: 1
- Q3 2015: 1
- Q4 2015: 2
- Q3 2016: 1
- Q1 2017: 1
- Q2 2017: 4
- Q3 2017: 7
- Q4 2017: 4
- Q1 2018: 3
- Q2 2018: 3
- Q3 2018: 4
- Q4 2018: 1
- Q1 2019: 4
- Q2 2019: 6
- Q3 2019: 6
- Q4 2019: 6
- Q1 2020: 7
- Q2 2020: 7
- Q3 2020: 9
- Q4 2020: 8
- Q1 2021: 6
- Q2 2021: 6
- Q3 2021: 7
- Q4 2021: 7
- Q1 2022: 8
- Q2 2022: 7
- Q3 2022: 10
- Q4 2022: 8
- Q1 2023: 6
- Q2 2023: 6
- Q3 2023: 7
- Q4 2023: 8
- Q1 2024: 8
- Q2 2024: 16
- Q3 2024: 18
- Q4 2024: 14
- Q1 2025: 14
- Q2 2025: 23
- Q3 2025: 20
- Q4 2025: 19
- Q1 2026: 19
- Q2 2026: 21
- Q3 2013: $20m
- Q4 2013: $28m
- Q1 2014: $39m
- Q2 2014: $43m
- Q3 2014: $34m
- Q4 2014: $44m
- Q1 2015: $174m
- Q2 2015: $211m
- Q3 2015: $168m
- Q4 2015: $169m
- Q3 2016: $146m
- Q1 2017: $189m
- Q2 2017: $180m
- Q3 2017: $890m
- Q4 2017: $954m
- Q1 2018: $428m
- Q2 2018: $475m
- Q3 2018: $416m
- Q4 2018: $150m
- Q1 2019: $897m
- Q2 2019: $559m
- Q3 2019: $284m
- Q4 2019: $680m
- Q1 2020: $472m
- Q2 2020: $1.0bn
- Q3 2020: $1.2bn
- Q4 2020: $1.0bn
- Q1 2021: $816m
- Q2 2021: $800m
- Q3 2021: $803m
- Q4 2021: $760m
- Q1 2022: $680m
- Q2 2022: $566m
- Q3 2022: $379m
- Q4 2022: $360m
- Q1 2023: $282m
- Q2 2023: $353m
- Q3 2023: $415m
- Q4 2023: $539m
- Q1 2024: $437m
- Q2 2024: $2.2bn
- Q3 2024: $2.3bn
- Q4 2024: $1.6bn
- Q1 2025: $1.9bn
- Q2 2025: $3.7bn
- Q3 2025: $5.8bn
- Q4 2025: $6.6bn
- Q1 2026: $7.0bn
- Q2 2026: $5.0bn
Between the quarter ends of Q1 2026 and Q2 2026. Each change in shares is valued at the Q2 2026 price, so the price’s own move is left out; a 13F shows the two quarter ends, not when in between anything was bought or sold.
Started in Q2 2026
Largest increases, by shares
- Fidelity (FMR LLC)13,160,167 to 16,143,583 shares+$318m
- Janus Henderson Group Ltd419,304 to 2,605,181 shares+$233m
- Maverick Capital Ltdnew: 2,150,762 shares+$229m
- Balyasny Asset Management LLC221,707 to 1,326,430 shares+$118m
- Millennium Management LLC1,157,786 to 2,048,005 shares+$95m
Largest decreases, by shares
- Artisan Partners LP6,527,301 to 5,441,718 shares-$116m
- AllianceBernstein LP688,734 to 462,796 shares-$37m
- ExodusPoint Capital Management LP148,133 to 69,500 shares-$8.4m
Left it
- Capital World Investorswas $223m
| Manager | Value over time | First listed | Largest | Q2 2026 |
|---|---|---|---|---|
| Fidelity (FMR LLC) | Q3 2017 | $2.2bn | $1.7bn | |
| D. E. Shaw & Co. | Q2 2019 | $920m | $627m | |
| Artisan Partners LP | Q1 2020 | $1.1bn | $580m | |
| T. Rowe Price Associates Inc | Q1 2015 | $1.1bn | $363m | |
| Janus Henderson Group Ltd | Q3 2017 | $329m | $278m | |
| Citadel Advisors LLC | Q3 2025 | $357m | $273m | |
| Maverick Capital Ltd | Q1 2025 | $229m | $229m | |
| Millennium Management LLC | Q3 2013 | $336m | $218m | |
| Balyasny Asset Management LLC | Q4 2023 | $141m | $141m | |
| Two Sigma Investments LP | Q3 2023 | $167m | $132m | |
| AllianceBernstein LP | Q3 2020 | $185m | $76m | |
| Squarepoint Ops LLC | Q3 2024 | $66m | $66m | |
| Point72 Asset Management LP | Q2 2014 | $99m | $57m | |
| Marshall Wace LLP | Q1 2014 | $112m | $54m | |
| Bridgewater Associates LP | Q1 2026 | $49m | $49m | |
| Invesco Ltd | Q3 2025 | $1.3bn | last listed Q1 2026 | |
| Capital World Investors | Q1 2026 | $223m | last listed Q1 2026 | |
| Jane Street Group LLC | Q2 2025 | $136m | last listed Q2 2025 | |
| Wellington Management Group LLP | Q2 2025 | $117m | last listed Q2 2025 | |
| AQR Capital Management LLC | Q1 2026 | $109m | last listed Q1 2026 | |
| Viking Global Investors LP | Q2 2024 | $69m | last listed Q2 2024 | |
| Two Sigma Advisers LP | Q3 2021 | $69m | last listed Q4 2025 | |
| Voloridge Investment Management LLC | Q1 2019 | $68m | last listed Q3 2025 | |
| Renaissance Technologies LLC | Q3 2025 | $51m | last listed Q3 2025 | |
| Man Group PLC | Q3 2024 | $45m | last listed Q1 2026 |
What INSM is worth
Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.
Build the comp set around INSM →How much of the picture this is
A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.
What to do with a name the funds are buying
Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.
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The holdings, every quarter, and the week between
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