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Stanley Druckenmiller's Insmed Incorporated (INSM) position

Yes: as of Q1 2026, Stanley Druckenmiller holds 1.2M shares of INSM worth $189M (6.4% of the disclosed portfolio). Last quarter the position was reduced by 22.1%. First disclosed Q2 2024.
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Current value
$189M
Shares held
1.2M
% of portfolio
6.4%
Est. average buy price (i)
$78.34
Quarter-end price
$163.52

Estimated trade prices

Average price in quarters with purchases
$78.34
Average prices in quarters with sales
  • Q1 2026: $153.74 (328K shares sold)
  • Q4 2025: $182.48 (942K shares sold)

INSM price vs Druckenmiller's position

1Y 3Y 5Y MAX
Dates
$10$50$100$150$200$25020222023202420252026New position of 20K shares · Q2 2024. Average closing price $38.78 · Price range $22.00–$69.7120KsharespurchasedAdded 573K shares (over 1,000%) · Q4 2024. Average closing price $72.02 · Price range $66.29–$76.65573KsharespurchasedAdded 776K shares (130.7%) · Q1 2025. Average closing price $76.49 · Price range $65.25–$83.83776KsharespurchasedAdded 884K shares (64.6%) · Q2 2025. Average closing price $76.46 · Price range $64.81–$105.90884KsharespurchasedAdded 170K shares (7.5%) · Q3 2025. Average closing price $122.51 · Price range $96.14–$147.20170KsharespurchasedSold 942K shares (38.9%) · Q4 2025. Average closing price $182.48 · Price range $147.28–$211.41942KsharessoldSold 328K shares (22.1%) · Q1 2026. Average closing price $153.74 · Price range $136.00–$177.12328Ksharessold
Average closing price · filing quarter
$153.74
Price range · filing quarter
$136.00 – $177.12
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Reduced −328K −$50M −22.1% 1.2M May 15, 2026
Q4 2025 Reduced −942K −$172M −38.9% 1.5M Feb 17, 2026
Q3 2025 Added +170K +$21M +7.5% 2.4M Nov 14, 2025
Q2 2025 Added +884K +$68M +64.6% 2.3M Aug 15, 2025
Q1 2025 Added +776K +$59M +130.7% 1.4M May 15, 2025
Q4 2024 Added +573K +$41M +2,867.3% 593K Feb 14, 2025
Q3 2024 Unchanged – – – 20K Nov 14, 2024
Q2 2024 New +20K +$776K – 20K Aug 14, 2024
Data through Q1 2026 · filed May 15, 2026
8 grouped rows from 8 quarters

Who else owns INSM

JPMorgan Chase & Co
owns 11.1% of shares outstanding
Est. $3.9B · Shares: 24.1M

Darwin Global Management, Ltd.
owns 7.8% of shares outstanding
Est. $2.7B · Shares: 16.8M

FMR LLC
owns 6.1% of shares outstanding
Est. $2.2B · Shares: 13.2M

Baker Bros. Advisors LP
owns 3.4% of shares outstanding
Est. $1.2B · Shares: 7.4M

See all owners of INSM →

More Druckenmiller positions

Natera, Inc.(NTRA)
$613M
20.9% of portfolio

Taiwan Semiconductor Manufacturing Company Limited(TSM)
$167M
5.7% of portfolio

YPF Sociedad Anónima(YPF)
an amount we cannot price
5.1% of portfolio

BBB Foods Inc.(TBBB)
an amount we cannot price
3.7% of portfolio

Alcoa Corporation(AA)
$99M
3.4% of portfolio

Sea Limited(SE)
$91M
3.1% of portfolio

Common questions

Does Stanley Druckenmiller own INSM?

Yes. As of Q1 2026, Stanley Druckenmiller disclosed 1.2M shares of INSM, worth $189M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Stanley Druckenmiller buy INSM?

Stanley Druckenmiller first disclosed a INSM position in Q2 2024; every quarterly buy and sell since is in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Stanley Druckenmiller sell INSM?

The quarter-by-quarter table above shows each sale and reduction Stanley Druckenmiller disclosed in INSM. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of INSM does Stanley Druckenmiller own?

Stanley Druckenmiller disclosed 1.2M shares of INSM as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Stanley Druckenmiller pay for INSM?

Stanley Druckenmiller's estimated average buy price for INSM is $78.34, from quarter-average prices weighted by the shares added each quarter. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How are the estimated trade prices calculated?

13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.