Ticker · CUSIP 457669307
Holders (tracked)
20
Combined shares
18,041,087
Combined value
$3.14B
Last close
$144.48
Quarter
2025Q4
Price · 1Y$144.48+71.83 (+98.87%)H $211.41 · L $65.08 · Avg Vol 2.9M
Congress buyCongress sell
Tracked holders · last 8 quarters
+4 vs previous quarter over the last 8.
Price is -17.0% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
27 events
- D.E. Shaw & Co. trimmed2026-02-17−1,306,469 shares · 2025Q4Position
- +111,100 shares · 2025Q4Position
- Wellington Management trimmed2026-02-17−231,905 shares · 2025Q4Position
- AQR Capital Management added2026-02-17+180,974 shares · 2025Q4Position
- Stanley Druckenmiller (Duquesne) trimmed2026-02-17−941,683 shares · 2025Q4Position
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−900,346 shares · 2025Q4Position
- Two Sigma Investments added2026-02-17+189,376 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−1,024,458 shares · 2025Q4Position
- Steve Cohen (Point72) exited2026-02-17−464,217 shares · 2025Q4Position
- T. Rowe Price trimmed2026-02-17−2,892,000 shares · 2025Q4Position
- Lee Ainslie (Maverick Capital) exited2026-02-13−656,539 shares · 2025Q4Position
- Renaissance Technologies trimmed2026-02-12−326,987 shares · 2025Q4Position
- Norges Bank (Norway SWF) opened position2026-02-10+2,910,971 shares · 2025Q4Position
- −134,010 shares · 2025Q3Position
- AQR Capital Management added2025-11-14+237,571 shares · 2025Q3Position
- Izzy Englander (Millennium Mgmt) added2025-11-14+214,395 shares · 2025Q3Position
- Steve Cohen (Point72) trimmed2025-11-14−26,450 shares · 2025Q3Position
- Two Sigma Investments added2025-11-14+396,272 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+2,234,845 shares · 2025Q3Position
- Wellington Management trimmed2025-11-14−441,656 shares · 2025Q3Position
- Stanley Druckenmiller (Duquesne) added2025-11-14+170,000 shares · 2025Q3Position
- Ron Baron (Baron Capital / BAMCO) added2025-11-14+1,500 shares · 2025Q3Position
- Lee Ainslie (Maverick Capital) trimmed2025-11-14−147,594 shares · 2025Q3Position
- T. Rowe Price trimmed2025-11-14−4,299,239 shares · 2025Q3Position
- Norges Bank (Norway SWF) exited2025-11-13−1,934,899 shares · 2025Q3Position
- Renaissance Technologies added2025-11-13+44,200 shares · 2025Q3Position
- Norges Bank (Norway SWF) trimmed2025-11-12−100,658 shares · 2024Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of INSM…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| T. Rowe Price | 2016Q1 | $31.16 | +363.7% | $583.6M |
| Wellington Management | 2017Q4 | $67.68 | +113.5% | $70.2M |
| Ron Baron (Baron Capital / BAMCO) | 2024Q3 | $74.55 | +93.8% | $5.5M |
| Norges Bank (Norway SWF) | 2016Q1 | $83.01 | +74.1% | $420.6M |
| Steve Cohen (Point72) | 2016Q2 | $86.79 | +66.5% | $2.3M |
| Steve Cohen (Point72) | 2016Q2 | $86.79 | +66.5% | $2.3M |
| Renaissance Technologies | 2016Q1 | $100.60 | +43.6% | $3.7M |
| Two Sigma Investments | 2017Q2 | $119.52 | +20.9% | $139.0M |
| Stanley Druckenmiller (Duquesne) | 2020Q2 | $141.52 | +2.1% | $214.1M |
| AQR Capital Management | 2016Q1 | $144.22 | +0.2% | $67.7M |
| Paul Tudor Jones (Tudor Investment) | 2016Q1 | $159.02 | -9.1% | $9.8M |
| Paul Tudor Jones (Tudor Investment) | 2016Q1 | $159.02 | -9.1% | $9.8M |
| Ken Griffin (Citadel Advisors) | 2016Q2 | $168.59 | -14.3% | $167.2M |
| Ken Griffin (Citadel Advisors) | 2016Q2 | $168.59 | -14.3% | $167.2M |
| Ken Griffin (Citadel Advisors) | 2016Q2 | $168.59 | -14.3% | $167.2M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $174.01 | -17.0% | $189.5M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $174.01 | -17.0% | $189.5M |
| D.E. Shaw & Co. | 2016Q1 | $174.02 | -17.0% | $1.7M |
| D.E. Shaw & Co. | 2016Q1 | $174.02 | -17.0% | $1.7M |
| D.E. Shaw & Co. | 2016Q1 | $174.02 | -17.0% | $1.7M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions2
- Norges Bank (Norway SWF)+2,910,971$506.6M
- Paul Tudor Jones (Tudor Investment)+111,100$19.3M
Added to2
- Two Sigma Investments+189,376$33.0M
- AQR Capital Management+180,974$31.5M
Trimmed7
- D.E. Shaw & Co.−1,306,469$227.4M
- Izzy Englander (Millennium Mgmt)−1,024,458$178.3M
- Ken Griffin (Citadel Advisors)−900,346$156.7M
- Renaissance Technologies−326,987$56.9M
- Wellington Management−231,905$40.4M
- T. Rowe Price−2,892,000$503K
- Stanley Druckenmiller (Duquesne)−941,683$164K
Exited2
- Lee Ainslie (Maverick Capital)−656,539$94.5M
- Steve Cohen (Point72)−464,217$66.9M
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 12 | $27.54B |
| 2022Q2 | 11 | $22.59B |
| 2022Q3 | 13 | $514.1M |
| 2022Q4 | 13 | $506.0M |
| 2023Q1 | 12 | $398.8M |
| 2023Q2 | 11 | $481.6M |
| 2023Q3 | 12 | $650.4M |
| 2023Q4 | 12 | $837.8M |
| 2024Q1 | 13 | $715.0M |
| 2024Q2 | 19 | $2.32B |
| 2024Q3 | 19 | $1.34B |
| 2024Q4 | 18 | $1.27B |
| 2025Q1 | 17 | $1.43B |
| 2025Q2 | 21 | $2.64B |
| 2025Q3 | 16 | $3.36B |
| 2025Q4 | 20 | $3.14B |
Congress members trading this stock
| Date | Member | Type | Amount range | Filing |
|---|---|---|---|---|
| 2025-10-03 | Gilbert Cisneros | Sell | $1K – $15K | PDF ↗ |
| 2025-09-22 | Gilbert Cisneros | Sell (P) | $1K – $15K | PDF ↗ |
| 2025-08-08 | Gilbert Cisneros | Sell (P) | $1K – $15K | PDF ↗ |
| 2025-07-07 | Gilbert Cisneros | Sell (P) | $1K – $15K | PDF ↗ |
| 2025-06-16 | Josh Gottheimer | Buy | $1K – $15K | PDF ↗ |
| 2025-04-09 | Josh Gottheimer | Sell (P) | $1K – $15K | PDF ↗ |
Who owns INSM
20 super-investors · 2025Q4
Tracked stake
18.04M
shares
Combined value
$3.14B
% of shares outstanding
—
shares-out unknown
Quarter action mix
New3Added2Trim12Sold2Held1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | D.E. Shaw & Co. | 4.35M | $757M |
| 2 | T. Rowe Price | 4.04M | $703M |
| 3 | Norges Bank Norway SWF | 2.91M | $507M |
| 4 | Stanley Druckenmiller Duquesne | 1.48M | $258M |
| 5 | Izzy Englander Millennium Mgmt | 1.31M | $228M |
| 6 | Ken Griffin Citadel Advisors | 1.16M | $201M |
| 7 | Two Sigma Investments | 962.2K | $167M |
| 8 | Wellington Management | 486.1K | $85M |
| 9 | AQR Capital Management | 468.3K | $81M |
| 10 | Ken Griffin Citadel Advisors | 432.9K | $75M |
| 11 | Ken Griffin Citadel Advisors | 218.8K | $38M |
| 12 | Paul Tudor Jones Tudor Investment | 68.0K | $12M |
| 13 | Paul Tudor Jones Tudor Investment | 43.1K | $8M |
| 14 | Ron Baron Baron Capital / BAMCO | 38.2K | $7M |
| 15 | Renaissance Technologies | 25.9K | $5M |
| 16 | Steve Cohen Point72 | 15.7K | $3M |
| 17 | Steve Cohen Point72 | 14.9K | $3M |
| 18 | D.E. Shaw & Co. | 12.1K | $2M |
| 19 | D.E. Shaw & Co. | 1.6K | $278K |
| 20 | Izzy Englander Millennium Mgmt | 1.2K | $209K |
Recent moves
20 transactions
- −1,024,458 · 2025Q4
- +180,974 · 2025Q4
- −464,217 · 2025Q4
- −231,905 · 2025Q4
- −941,683 · 2025Q4
- TRIMT. Rowe Price−2,892,000 · 2025Q4
- −900,346 · 2025Q4
- +111,100 · 2025Q4
- TRIMD.E. Shaw & Co.−1,306,469 · 2025Q4
- +189,376 · 2025Q4
- −656,539 · 2025Q4
- −326,987 · 2025Q4
- +2,910,971 · 2025Q4
- −134,010 · 2025Q3
- −26,450 · 2025Q3
- +214,395 · 2025Q3
- +396,272 · 2025Q3
- +2,234,845 · 2025Q3
- −147,594 · 2025Q3
- TRIMT. Rowe Price−4,299,239 · 2025Q3
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